How Your Immune System Works
Inside your body there is an amazing protectio­n mechanism called the immune system. It is designed to defend you against millions of bacteria, microbes, viruses, toxins and parasites that would love to invade your body. To understand the power of the immune system, all that you have to do is look at what happens to anything once it dies. That sounds gross, but it does show you something very important about your immune system.

When something dies, its immune system (along with everything else) shuts down. In a matter of hours, the body is invaded by all sorts of bacteria, microbes, parasites... None of these things are able to get in when your immune system is working, but the moment your immune system stops the door is wide open. Once you die it only takes a few weeks for these organisms to completely dismantle your body and carry it away, until all that's left is a skeleton. Obviously your immune system is doing something amazing to keep all of that dismantling from happening when you are alive.

The immune system is complex, intricate and interesting. And there are at least two good reasons for you to know more about it. First, it is just plain fascinating to understand where things like fevers, hives, inflammation, etc., come from when they happen inside your own body. You also hear a lot about the immune system in the news as new parts of it are understood and new drugs come on the market -- knowing about the immune system makes these news stories understandable. In this article, we will take a look at how your immune system works so that you can understand what it is doing for you each day, as well as what it is not.

Seeing Your Immune System

Your immune system works around the clock in thousands of different ways, but it does its work largely unnoticed. One thing that causes us to really notice our immune system is when it fails for some reason. We also notice it when it does something that has a side effect we can see or feel. Here are several examples:

• When you get a cut, all sorts of bacteria and viruses enter your body through the break in the skin. When you get a splinter you also have the sliver of wood as a foreign object inside your body. Your immune system responds and eliminates the invaders while the skin heals itself and seals the puncture. In rare cases the immune system misses something and the cut gets infected. It gets inflamed and will often fill with pus. Inflammation and pus are both side-effects of the immune system doing its job.

• When a mosquito bites you, you get a red, itchy bump. That too is a visible sign of your immune system at work.

• Each day you inhale thousands of germs (bacteria and viruses) that are floating in the air. Your immune system deals with all of them without a problem. Occasionally a germ gets past the immune system and you catch a cold, get the flu or worse. A cold or flu is a visible sign that your immune system failed to stop the germ. The fact that you get over the cold or flu is a visible sign that your immune system was able to eliminate the invader after learning about it. If your immune system did nothing, you would never get over a cold or anything else.

• Each day you also eat hundreds of germs, and again most of these die in the saliva or the acid of the stomach. Occasionally, however, one gets through and causes food poisoning. There is normally a very visible effect of this breach of the immune system: vomiting and diarrhea are two of the most common symptoms.
• There are also all kinds of human ailments that are caused by the immune system working in unexpected or incorrect ways that cause problems. For example, some people have allergies. Allergies are really just the immune system overreacting to certain stimuli that other people don't react to at all. Some people have diabetes, which is caused by the immune system inappropriately attacking cells in the pancreas and destroying them. Some people have rheumatoid arthritis, which is caused by the immune system acting inappropriately in the joints. In many different diseases, the cause is actually an immune system error.

• Finally, we sometimes see the immune system because it prevents us from doing things that would be otherwise beneficial. For example, organ transplants are much harder than they should be because the immune system often rejects the transplanted organ.

Basics of the Immune System

Let's start at the beginning. What does it mean when someone says "I feel sick today?" What is a disease? By understanding the different kinds of diseases it is possible to see what types of disease the immune system helps you handle.

When you "get sick", your body is not able to work properly or at its full potential. There are many different ways for you to get sick -- here are some of them:

• Mechanical damage - If you break a bone or tear a ligament you will be "sick" (your body will not be able to perform at its full potential). The cause of the problem is something that is easy to understand and visible.

• Vitamin or mineral deficiency - If you do not get enough vitamin D your body is not able to metabolize calcium properly and you get a disease known as rickets. People with rickets have weak bones (they break easily) and deformities because the bones do not grow properly. If you do not get enough vitamin C you get scurvy, which causes swollen and bleeding gums, swollen joints and bruising. If you do not get enough iron you get anemia, and so on.

• Organ degradation - In some cases an organ is damaged or weakened. For example, one form of "heart disease" is caused by obstructions in the blood vessels leading to the heart muscle, so that the heart does not get enough blood. One form of "liver disease", known as Cirrhosis, is caused by damage to liver cells (drinking too much alcohol is one cause).

• Genetic disease - A genetic disease is caused by a coding error in the DNA. The coding error causes too much or too little of certain proteins to be made, and that causes problems at the cellular level. For example, albinism is caused by a lack of an enzyme called tyrosinase. That missing enzyme means that the body cannot manufacture melanin, the natural pigment that causes hair color, eye color and tanning. Because of the lack of melanin, people with this genetic problem are extremely sensitive to the UV rays in sunlight.

• Cancer - Occasionally a cell will change in a way that causes it to reproduce uncontrollably. For example, when cells in the skin called melanocytes are damaged by ultraviolet radiation in sunlight they change in a characteristic way into a cancerous form of cell. The visible cancer that appears as a tumor on the skin is called melanoma. 

Viral or Bacterial Infection

When a virus or bacteria (also known generically as a germ) invades your body and reproduces, it normally causes problems. Generally the germ's presence produces some side effect that makes you sick. For example, the strep throat bacteria (Streptococcus) releases a toxin that causes inflammation in your throat. The polio virus releases toxins that destroy nerve cells (often leading to paralysis). Some bacteria are benign or beneficial (for example, we all have millions of bacteria in our intestines and they help digest food), but many are harmful once they get into the body or the bloodstream.

Viral and bacterial infections are by far the most common causes of illness for most people. They cause things like colds, influenza, measles, mumps, malaria, AIDS and so on.

The job of your immune system is to protect your body from these infections. The immune system protects you in three different ways:

1. It creates a barrier that prevents bacteria and viruses from entering your body.
2. If a bacteria or virus does get into the body, the immune system tries to detect and eliminate it before it can make itself at home and reproduce.
3. If the virus or bacteria is able to reproduce and start causing problems, your immune system is in charge of eliminating it.

The immune system also has several other important jobs. For example, your immune system can detect cancer in early stages and eliminate it in many cases.

Components of the Immune System

One of the funny things about the immune system is that it has been working inside your body your entire life but you probably know almost nothing about it. For example, you are probably aware that inside your chest you have an organ called a "heart". Who doesn't know that they have a heart? You have probably also heard about the fact that you have lungs and a liver and kidneys. But have you even heard about your thymus? There's a good chance you don't even know that you have a thymus, yet its there in your chest right next to your heart. There are many other parts of the immune system that are just as obscure, so let's start by learning about all of the parts.

The most obvious part of the immune system is what you can see. For example, skin is an important part of the immune system. It acts as a primary boundary between germs and your body. Part of your skin's job is to act as a barrier in much the same way we use plastic wrap to protect food. Skin is tough and generally impermeable to bacteria and viruses. The epidermis contains special cells called Langerhans cells (mixed in with the melanocytes in the basal layer) that are an important early-warning component in the immune system. The skin also secretes antibacterial substances. These substances explain why you don't wake up in the morning with a layer of mold growing on your skin -- most bacteria and spores that land on the skin die quickly.

Your nose, mouth and eyes are also obvious entry points for germs. Tears and mucus contain an enzyme (lysozyme) that breaks down the cell wall of many bacteria. Saliva is also anti-bacterial. Since the nasal passage and lungs are coated in mucus, many germs not killed immediately are trapped in the mucus and soon swallowed. Mast cells also line the nasal passages, throat, lungs and skin. Any bacteria or virus that wants to gain entry to your body must first make it past these defenses.

Once inside the body, a germ deals with the immune system at a different level. The major components of the immune system are:

• Thymus
• Spleen
• Lymph system
• Bone marrow
• White blood cells
• Antibodies
• Complement system
• Hormones

Let's look at each of these components in detail.

Lymph System

The lymph system is most familiar to people because doctors and mothers often check for "swollen lymph nodes" in the neck. It turns out that the lymph nodes are just one part of a system that extends throughout your body in much the same way your blood vessels do. The main difference between the blood flowing in the circulatory system and the lymph flowing in the lymph system is that blood is pressurized by the heart, while the lymph system is passive. There is no "lymph pump" like there is a "blood pump" (the heart). Instead, fluids ooze into the lymph system and get pushed by normal body and muscle motion to the lymph nodes. This is very much like the water and sewer systems in a community. Water is actively pressurized, while sewage is passive and flows by gravity.

Lymph is a clearish liquid that bathes the cells with water and nutrients. Lymph is blood plasma -- the liquid that makes up blood minus the red and white cells. Think about it -- each cell does not have its own private blood vessel feeding it, yet it has to get food, water, and oxygen to survive. Blood transfers these materials to the lymph through the capillary walls, and lymph carries it to the cells. The cells also produce proteins and waste products and the lymph absorbs these products and carries them away. Any random bacteria that enter the body also find their way into this inter-cell fluid. One job of the lymph system is to drain and filter these fluids to detect and remove the bacteria. Small lymph vessels collect the liquid and move it toward larger vessels so that the fluid finally arrives at the lymph nodes for processing.

Lymph nodes contain filtering tissue and a large number of lymph cells. When fighting certain bacterial infections, the lymph nodes swell with bacteria and the cells fighting the bacteria, to the point where you can actually feel them. Swollen lymph nodes are therefore a good indication that you have an infection of some sort.

Once lymph has been filtered through the lymph nodes it re-enters the bloodstream.

Thymus

The thymus lives in your chest, between your breast bone and your heart. It is responsible for producing T-cells (see the next section), and is especially important in newborn babies - without a thymus a baby's immune system collapses and the baby will die. The thymus seems to be much less important in adults - for example, you can remove it and an adult will live because other parts of the immune system can handle the load. However, the thymus is important, especially to T cell maturation (as we will see in the section on white blood cells below).

Spleen
The spleen filters the blood looking for foreign cells (the spleen is also looking for old red blood cells in need of replacement). A person missing their spleen gets sick much more often than someone with a spleen.

Bone marrow
Bone marrow produces new blood cells, both red and white. In the case of red blood cells the cells are fully formed in the marrow and then enter the bloodstream. In the case of some white blood cells, the cells mature elsewhere. The marrow produces all blood cells from stem cells. They are called "stem cells" because they can branch off and become many different types of cells - they are precursors to different cell types. Stem cells change into actual, specific types of white blood cells.

White blood cells
White blood cells are described in detail in the next section.

Antibodies

Antibodies (also referred to as immunoglobulins and gammaglobulins) are produced by white blood cells. They are Y-shaped proteins that each respond to a specific antigen (bacteria, virus or toxin). Each antibody has a special section (at the tips of the two branches of the Y) that is sensitive to a specific antigen and binds to it in some way. When an antibody binds to a toxin it is called an antitoxin (if the toxin comes from some form of venom, it is called an antivenin). The binding generally disables the chemical action of the toxin. When an antibody binds to the outer coat of a virus particle or the cell wall of a bacterium it can stop their movement through cell walls. Or a large number of antibodies can bind to an invader and signal to the complement system that the invader needs to be removed.

Antibodies come in five classes:

• Immunoglobulin A (IgA)
• Immunoglobulin D (IgD)
• Immunoglobulin E (IgE)
• Immunoglobulin G (IgG)
• Immunoglobulin M (IgM)

Whenever you see an abbreviation like IgE in a medical document, you now know that what they are talking about is an antibody.

Complement System

The complement system, like antibodies, is a series of proteins. There are millions of different antibodies in your blood stream, each sensitive to a specific antigen. There are only a handful of proteins in the complement system, and they are floating freely in your blood. Complements are manufactured in the liver. The complement proteins are activated by and work with (complement) the antibodies, hence the name. They cause lysing (bursting) of cells and signal to phagocytes that a cell needs to be removed.

Hormones
There are several hormones generated by components of the immune system. These hormones are known generally as lymphokines. It is also known that certain hormones in the body suppress the immune system. Steroids and corticosteroids (components of adrenaline) suppress the immune system.

Tymosin (thought to be produced by the thymus) is a hormone that encourages lymphocyte production (a lymphocyte is a form of white blood cell - see below). Interleukins are another type of hormone generated by white blood cells. For example, Interleukin-1 is produced by macrophages after they eat a foreign cell. IL-1 has an interesting side-effect - when it reaches the hypothalamus it produces fever and fatigue. The raised temperature of a fever is known to kill some bacteria.

Tumor Necrosis Factor
Tumor Necrosis Factor (TNF) is also produced by macrophages. It is able to kill tumor cells, and it also promotes the creation of new blood vessels so it is important to healing.

Interferon
Interferon interferes with viruses (hence the name) and is produced by most cells in the body. Interferons, like antibodies and complements, are proteins, and their job is to let cells signal to one another. When a cell detects interferon from other cells, it produces proteins that help prevent viral replication in the cell.

White Blood Cells

You are probably aware of the fact that you have "red blood cells" and "white blood cells" in your blood. The white blood cells are probably the most important part of your immune system. And it turns out that "white blood cells" are actually a whole collection of different cells that work together to destroy bacteria and viruses. Here are all of the different types, names and classifications of white blood cells working inside your body right now:

• Leukocytes
• Lymphocyte
• Monocytes
• Granulocytes
• B-cells
• Plasma cells
• T-cells
• Helper T-cells
• Killer T-cells
• Suppressor T-cells
• Natural killer cells
• Neutrophils
• Eosinophils
• Basophils
• Phagocytes
• Macrophages

Leukocytes

Learning all of these different names and the function of each cell type takes a bit of effort, but you can understand scientific articles a lot better once you get it all figured out! Here's a quick summary to help you get all of the different cell types organized in your brain.

All white blood cells are known officially as leukocytes. White blood cells are not like normal cells in the body -- they actually act like independent, living single-cell organisms able to move and capture things on their own. White blood cells behave very much like amoeba in their movements and are able to engulf other cells and bacteria. Many white blood cells cannot divide and reproduce on their own, but instead have a factory somewhere in the body that produces them. That factory is the bone marrow.

Leukocytes are divided into three classes:

• Granulocytes - Granulocytes make up 50% to 60% of all leukocytes. Granulocytes are themselves divided into three classes: neutrophils, eosinophils and basophils. Granulocytes get their name because they contain granules, and these granules contain different chemicals depending on the type of cell.

• Lymphocyte - Lymphocytes make up 30% to 40% of all leukocytes. Lymphocytes come in two classes: B cells (those that mature in bone marrow) and T cells (those that mature in the thymus).

• Monocyte - Monocytes make up 7% or so of all leukocytes. Monocytes evolve into macrophages.

All white blood cells start in bone marrow as stem cells. Stem cells are generic cells that can form into the many different types of leukocytes as they mature. For example, you can take a mouse, irradiate it to kill off its bone marrow's ability to produce new blood cells, and then inject stem cells into the mouse's blood stream. The stem cells will divide and differentiate into all different types of white blood cells. A "bone marrow transplant" is accomplished simply by injecting stem cells from a donor into the blood stream. The stem cells find their way, almost magically, into the marrow and make their home there.

Different Roles

Each of the different types of white blood cells have a special role in the immune system, and many are able to transform themselves in different ways. The following descriptions help to understand the roles of the different cells.

• Neutrophils are by far the most common form of white blood cells that you have in your body. Your bone marrow produces trillions of them every day and releases them into the bloodstream, but their life span is short -- generally less than a day. Once in the bloodstream neutrophils can move through capillary walls into tissue. Neutorphils are attracted to foreign material, inflammation and bacteria. If you get a splinter or a cut, neutrophils will be attracted by a process called chemotaxis. Many single-celled organisms use this same process -- chemotaxis lets motile cells move toward higher concentrations of a chemical. Once a neutrophil finds a foreign particle or a bacteria it will engulf it, releasing enzymes, hydrogen peroxide and other chemicals from its granules to kill the bacteria. In a site of serious infection (where lots of bacteria have reproduced in the area), pus will form. Pus is simply dead neutrophils and other cellular debris.

• Eosinophils and basophils are far less common than neutrophils. Eosinophils seem focused on parasites in the skin and the lungs, while Basophils carry histamine and therefore important (along with mast cells) to causing inflammation. From the immune system's standpoint inflammation is a good thing. It brings in more blood and it dilates capillary walls so that more immune system cells can get to the site of infection.

• Of all blood cells, macrophages are the biggest (hence the name "macro"). Monocytes are released by the bone marrow, float in the bloodstream, enter tissue and turn into macrophages. Most boundary tissue has its own devoted macrophages. For example, alveolar macrophages live in the lungs and keep the lungs clean (by ingesting foreign particles like smoke and dust) and disease free (by ingesting bacteria and microbes). Macrophages are called langerhans cells when they live in the skin. Macrophages also swim freely. One of their jobs is to clean up dead neutrophils -- macropghages clean up pus, for example, as part of the healing process.
• The lymphocytes handle most of the bacterial and viral infections that we get. Lymphocytes start in the bone marrow. Those destined to become B cells develop in the marrow before entering the bloodstream. T cells start in the marrow but migrate through the bloodstream to the thymus and mature there. T cells and B cells are often found in the bloodstream but tend to concentrate in lymph tissue such as the lymph nodes, the thymus and the spleen. There is also quite a bit of lymph tissue in the digestive system. B cells and T cells have different functions.

• B cells, when stimulated, mature into plasma cells -- these are the cells that produce antibodies. A specific B cell is tuned to a specific germ, and when the germ is present in the body the B cell clones itself and produces millions of antibodies designed to eliminate the germ.

• T cells, on the other hand, actually bump up against cells and kill them. T cells known as Killer T cells can detect cells in your body that are harboring viruses, and when it detects such a cell it kills it. Two other types of T cells, known as Helper and Suppressor T cells, help sensitize killer T cells and control the immune response.

T Cells

Helper T cells are actually quite important and interesting. They are activated by Interleukin-1, produced by macrophages. Once activated, Helper T cells produce Interleukin-2, then interferon and other chemicals. These chemicals activate B cells so that they produce antibodies. The complexity and level of interaction between neutrophils, macrophages, T cells and B cells is really quite amazing.

Because white blood cells are so important to the immune system, they are used as a measure of immune system health. When you hear that someone has a "strong immune system" or a "suppressed immune system", one way it was determined was by counting different types of white blood cells in a blood sample. A normal white blood cell count is in the range of 4,000 to 11,000 cells per microliter of blood. 1.8 to 2.0 helper T-cells per suppressor T-cell is normal. A normal absolute neutrophil count (ANC) is in the range of 1,500 to 8,000 cells per microliter. An article like Introduction to Hematology can help you learn more about white blood cells in general and the different types of white blood cells found in your body.

One important question to ask about white blood cells (and several other parts of the immune system) is, "How does a white blood cell know what to attack and what to leave alone? Why doesn't a white blood cell attack every cell in the body?" There is a system built into all of the cells in your body called the Major Histocompatibility Complex (MHC) (also known as the Human Leukocyte Antigen (HLA)) that marks the cells in your body as "you". Anything that the immune system finds that does not have these markings (or that has the wrong markings) is definitely "not you" and is therefore fair game. Encyclopedia Britannica has this to say about the MHC:

"There are two major types of MHC protein molecules--class I and class II--that span the membrane of almost every cell in an organism. In humans these molecules are encoded by several genes all clustered in the same region on chromosome 6. Each gene has an unusual number of alleles (alternate forms of a gene). As a result, it is very rare for two individuals to have the same set of MHC molecules, which are collectively called a tissue type.

MHC molecules are important components of the immune response. They allow cells that have been invaded by an infectious organism to be detected by cells of the immune system called T lymphocytes, or T cells. The MHC molecules do this by presenting fragments of proteins (peptides) belonging to the invader on the surface of the cell. The T cell recognizes the foreign peptide attached to the MHC molecule and binds to it, an action that stimulates the T cell to either destroy or cure the infected cell. In uninfected healthy cells the MHC molecule presents peptides from its own cell (self peptides), to which T cells do not normally react. However, if the immune mechanism malfunctions and T cells react against self peptides, an autoimmune disease arises."

Vaccinations

There are many diseases that, if you catch them once, you will never catch again. Measles is a good example, as is chicken pox. What happens with these diseases is that they make it into your body and start reproducing. The immune system gears up to eliminate them. In your body you already have B cells that can recognize the virus and produce antibodies for it. However, there are only a few of these cells for each antibody. Once a particlular disease is recognized by these few specific B cells, the B cells turn into plasma cells, clone themselves and start pumping out antibodies. This process takes time, but the disease runs it course and is eventually eliminated. However, while it is being eliminated, other B cells for the disease clone themselves but do not generate antibodies. This second set of B cells remains in your body for years, so if the disease reappears your body is able to eliminate it immediately before it can do anything to you.

A vaccine is a weakened form of a disease. It is either a killed form of the disease, or it is a similar but less virulent strain. Once inside your body your immune system mounts the same defense, but because the disease is different or weaker you get few or no symptoms of the disease. Now, when the real disease invades your body, your body is able to eliminate it immediately.

Vaccines exist for all sorts of diseases, both viral and bacterial: measles, mumps, whooping cough, tuberculosis, smallpox, polio, typhoid, etc.

Many diseases cannot be cured by vaccines, however. The common cold and Influenza are two good examples. These diseases either mutate so quickly or have so many different strains in the wild that it is impossible to inject all of them into your body. Each time you get the flu, for example, you are getting a different strain of the same disease.

AIDS

AIDS (Acquired Immune Deficiency Syndrome) is a disease caused by HIV (the Human Immunodeficiency Virus). This is a particularly problematic disease for the immune system because the virus actually attacks immune system cells. In particular, it reproduces inside Helper T cells and kills them in the process. Without Helper T cells to orchestrate things, the immune system eventually collapses and the victim dies of some other infection that the immune system would normally be able to handle.

How Antibiotics Work

Sometimes your immune system is not able to activate itself quickly enough to outpace the reproductive rate of a certain bacteria, or the bacteria is producing a toxin so quickly that it will cause permanent damage before the immune system can eliminate the bacteria. In these cases it would be nice to help the immune system by killing the offending bacteria directly.

Antibiotics work on bacterial infections. Antibiotics are chemicals that kill the bacteria cells but do not affect the cells that make up your body. For example, many antibiotics interrupt the machinery inside bacterial cells that builds the cell wall. Human cells do not contain this machinery, so they are unaffected. Different antibiotics work on different parts of bacterial machinery, so each one is more or less effective on specific types of bacteria. You can see that, because a virus is not alive, antibiotics have no effect on a virus.

One problem with antibiotics is that they lose effectiveness over time. If you take an antibiotic it will normally kill all of the bacteria it targets over the course of a week or 10 days. You will feel better very quickly (in just a day or two) because the antibiotic kills the majority of the targeted bacteria very quickly. However, on occasion one of the bacterial offspring will contain a mutation that is able to survive the specific antibiotic. This bacteria will then reproduce and the whole disease mutates. Eventually the new strain is infecting everyone and the old antibiotic has no effect on it. This process has become more and more of a problem over time and has become a significant concern in the medical community.

Immune System Mistakes

Sometimes the immune system makes a mistake. One type of mistake is called autoimmunity: the immune system for some reason attacks your own body in the same way it would normally attack a germ. Two common diseases are caused by immune system mistakes. Juvenile-onset diabetes is caused by the immune system attacking and eliminating the cells in the pancreas that produce insulin. Rheumatoid arthritis is caused by the immune system attacking tissues inside the joints.

Allergies are another form of immune system error. For some reason, in people with allergies, the immune system strongly reacts to an allergen that should be ignored. The allergen might be a certain food, or a certain type of pollen, or a certain type of animal fur. For example, a person allergic to a certain pollen will get a runny nose, watery eyes, sneezing, etc. This reaction is caused primarily by mast cells in the nasal passages. In reaction to the pollen the mast cells release histamine. Histamine has the effect of causing inflammation, which allows fluid to flow from blood vessels. Histamine also causes itching. To eliminate these symptoms the drug of choice is, of course, an antihistamine.

The last example of an immune system mistake is the effect the immune system has on transplanted tissue. This really isn't a mistake, but it makes organ and tissue transplants nearly impossible. When the foreign tissue is placed inside your body, its cells do not contain the correct identification. Your immune system therefore attacks the tissue. The problem cannot be prevented, but can be diminished by carefully matching the tissue donor with the recipient and by using immunosuppressing drugs to try to prevent an immune system reaction. Of course, by suppressing the immune system these drugs open the patient to opportunistic infections.

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Immune System
It has only been in the last three to four decades that research into the workings of the immune system has really taken off. Prior to this, the immune system was not completely ignored by the established medical community; it was used as an indicator of one’s health status.

Remember your "white count" tests? A high white blood cell count told the physician that your body was fighting an infection. Beyond that, it pretty much was not only ignored, but it was abused, especially considering the innumerable medical procedures and drug therapies that suppress the immune system—some procedures actually decimate it.

FYI: A high white count is no longer just an indication of an infection; it also is a measure of stress. Our immune system is an amazing mechanism.

In the 1950s, tonsillectomies (removals of tonsils) were standard procedure. The tonsils happen to be one of the first line of defenses against disease and they are your only defense against the poliomyelitis virus. In the 1990s the medical community began to admit, though not too loudly, that the polio epidemic of the 1950s was iatrogenic (caused by physician intervention).

Another medical procedure responsible for suppressing the immune system is the appendectomy (removal of the appendix). Did you know that the appendix is part of your immune system? Did you know there are natural ways of reversing an appendicitis attack? Did you know that an appendicitis attack is actually a warning of something even bigger amiss?

Removing inflamed tonsils or an inflamed appendix is equivalent to tossing out your smoke detector because it’s making too much noise. Immunologists tell us that the tonsils are not to be removed under any circumstance, yet every year over a million tonsillectomies are performed in America, and in some states, removing the appendix is required by law if the lower abdomen is opened. Fortunately our bodies know more than doctors and 20% of the time we actually grow back tonsils and the appendix after they’ve been removed.

All surgeries depresses the immune system. The greatest cause of death following a successful surgery is a secondary, or nosocomial infection (one picked up as a result of the hospital stay). With a depressed immune system, secondary infections are deadly. Antibiotics depress the immune system by taking over its job. Antibiotics also deplete the "good" bacteria (probiotics) needed for cleansing toxins from your system. Corticosteroids, hormones that are naturally created in the body, have been (are still) administered abundantly because of their anti-inflammatory properties. Over the counter strengths are now available and their use is wide spread. As with most hormonal therapies, the use of corticosteroids are a double edged sword: they suppress the initial inflammatory response to injury or illness, and they suppress the immune system.

Our purpose here is to let you in on the workings of your immune system, its suppressors, triggers, boosters, and modulators. We are not going to turn you into immunologists, but rather teach you some of the basics.

One of the reasons it has taken science so long to get a grip on the immune system is that its parts and interconnectedness are not readily perceivable. We have the digestive system, the circulatory system, the nervous system, and the respiratory system to name a few systems. These systems are easily described because they are physically connected. The immune system, on the other hand, consists of, ostensibly, unrelated parts and pieces, and much of what connects the whole thing together is molecular.

The immune system is action and reaction. It has an intelligence of its own, though primitive: the product of stimulus and response. For example, if a microscopic piece of an organ gets into the blood stream either through disease or by injury, the immune system will respond to it as if it were a foreign body, and having done so, the immune system is now trained to attack the original organ. The suppressor T-cells have to stop this attack or we have the beginning of an autoimmune response (lupus is an autoimmune disease in which the immune system actually attacks the person’s own body).

When referring to the immune system’s physical parts, we call the collection of these parts the lymphatic system, though the entire immune system, on a molecular level, goes much further, for even the tiniest cell in our bodies can create chemicals to aid in the defense of the entire system.

The lymphatic system consists of two parts, the primary and secondary organs. Top

Primary Organs: thymus gland (located beneath the breast bone and functioning at its peak during adolescence) and the bone marrow (producing specialized lymphocytes—T-cells and B-cells and dispatching them through the lymph vessels to the secondary organs.

Secondary Organs: the lymph nodes, the spleen, tonsils, Peyer’s patches in the small intestines, the liver, and the appendix to name a few. These are the locations where the molecular parts of the immune system gather in readiness to do battle with germs, viruses, and allergens (those things causing allergic responses). Top

The thymus gland is the central organ in the development of immune power. Within its cortex, the bone marrow lymphocytes mature into T-cells helped by thymosin, a hormone secreted by the thymus gland.

The main job of bone marrow is to produce blood cells, both red and white (leukocytes and lymphocytes). It is the soft tissue located in the cavities of the bones. It is the source of stem cells which differentiate (change into) leukocytes and lymphocytes.

To sum up things so far: the bone marrow creates the stem cells which become the cells of the immune system. From the bone marrow lymphocytes are sent to the thymus gland to mature and are then stored in the secondary organs of the lymph system and in the blood stream. The bone marrow also sends leukocytes into the blood stream on sentry duty. Everything stands in a "combat ready" state.

Now let’s look at the cellular components of the system. There are two major cell type of immune system cells: phagocytes and lymphocytes. As you can guess, lymphocytes have something to do with the lymph system. They are small white cells found in lymphoid tissues (the secondary organs of the lymph system) and present also in the blood. They get to the blood stream from the lymph nodes which are small pea sized organs distributed throughout the body. The lymph nodes trap antigens (substances that trigger an immune response) and filter them out of the lymph fluid. The lymph fluid is actually tissue fluids that have been collected from throughout the body for cleaning, and then are returned to the blood stream via lymphatic vessels. Top

Lymphocytes
There are two types of lymphocytes: T-cells and B-cells. T-cells are the master regulators of the immune system.

There are three main types of T-cells: helper T-cells (their quantity being a CD4 count), suppressor T-cells (their quantity being a CD8 count), and effector T-cells (sometimes referred to as natural killer, or NK, cells).

B-cells have a relatively short life span compared to T-cells. As B-cells mature, they turn into antibody-producing plasma cells found in lymph nodes and in the spleen. Once the B-cells have created a specific antibody to attack a specific pathogen, their primitive intelligence remembers this information and will know it later should they run up against the same pathogen. This is called "building resistance."

You should note that sulfur-containing amino acids are necessary in your diet for the formation of antibodies. These are cysteine, methionine, taurine and homocysteine.

Cystein is found in a variety of foods including poultry, yogurt, egg yolks, red peppers, garlic, onions, broccoli, Brussel sprouts, oats, and wheat germ. Taurine is found in eggs, fish, meat, and milk. Taurine is also found in some plant foods like seaweeds, but present in very low levels. It is highly present in sea foods such as clam, squid, octopus, and oyster. Methionine is found in animal products, and is important to control fat levels in the liver and the arteries. Plant foods that contain methionine are beans, seeds, onions, peanuts, lentils, and some grains. Methionine is also one of the amino acids in Bragg Liquid Aminos.

Ironically, homocysteine levels in most Americans are way too high which results in cardiovascular disease. Homocysteine is formed by the breakdown of methionine. We need a good B-Complex Vitamin to lower these levels, and sometimes that's not enough, and Betaine and Choline must be used.

High homocysteine levels have been associated with depression too.

NK Cell Activity
We have to stop here to take a look at NK Cell Activity, for it is the primary criteria determining the overall strength and health of your immune system. NK cells are not, like white blood cells, measured by their number, for their number stays constant, approximately 15% the number of your white blood cells. NK cells provide the first line of defense in dealing with any invasion to your body once they invaders have passed the sentries in your mucus membranes and the tonsils. Each NK cell contains several small granules that act like explosive charges: when a cancer cell is recognized, the NK cell attaches itself to the cancer cell and injects these granules into the cancer cell and they explode, destroying the cancer cell within five minutes. The NK cell then moves on to another invader. Healthy NK cells have been know to attack two or more invaders or infected cells at once.

It is now accepted that individuals with low NK cell activity are more susceptible to Chronic Fatigue, autoimmune diseases, cancerous tumors and viral infections. There is a test to determine you NK cell activity, called the 4 hour 51Chromium-release assay. If you are dealing with one of the disorders listed above, this test might be a good idea.


T-cells
Helper T-cells stimulate B-cell production and augment production of more helper cells and effector cells (natural killer cells). Suppressor T-cells act to diminish helper T-cell activity, for let’s face it, when the battle is over, we don’t want the immune system to keep on fighting.

Normally there are about twice as many helper T-cells as suppressor T-cells. In immune deficiency diseases, such as AIDS, you will often hear about the CD4 count falling below the CD8 count. What they are talking about is the helper/ suppressor ratio getting out of whack. When this occurs, the body is ripe for an "opportunistic infection."

Since we’ve mentioned antibodies, let’s discuss them here (we’ll get back to the phagocytes shortly). Antibodies are protein molecules (called immunoglobulins:Ig) produced by the B-cells.

There are five classes of antibodies: IgA, IgD, IgE, IgG, and IgM. IgA and IgE are referred to as secretory antibodies because they are found in our secretions. IgA is found abundantly in saliva and in the mucous membranes of your lungs, intestinal track, and genitals. It is the first line of defense against invading bacteria. Laboratory studies show increases in IgA output in people enjoying themselves during exercise, laughter, and love making. Laughter is the best medicine.

IgE is our first defense against allergies and parasites. It is thought that as many as half a million IgE molecules can bind to a single mast cell. Mast cells act as sentinels. They trigger a quick response to an invasion of allergens and parasites, and it is the immunoglobulin E that triggers the release of histamines (those things we take antihistamines to suppress). Histamines increase immune response and blood flow. Taking an antihistamine reduces symptoms, but allows the dis-ease can get out of hand. One of the best ways to relieve the pressures brought on by histamine production (whether in the lungs during an asthma attack or in the sinuses) is to increase you consumption of clean, pure, room temperature water.

Antibodies do not destroy the enemy by themselves, but call in complements. Antibodies are Y-shaped and travel through the bloodstream seeking invading bacteria, viruses, and microbes. When an invader is discovered, the antibody seizes it with one of the upper branches of the its Y and calls in the complements.

Complements, C1 through C9, are complex blood proteins containing carbon, hydrogen, oxygen and nitrogen. When called, they line up, C1 through C9, and attack in a linear fashion, one at a time, and when all eight are in place, they pierce the enemy’s coating causing the insides to spill out and then signal the macrophages and neutrophils to come and clean up the mess. Complements have the ability to bind to B-cells and certain immunoglobulins.  

Phagocytes
Phagocytes (leukocytes) are the second type of immune system cells; lymphocytes are the other. They ingest other cells, microbes, and foreign particles in a process of phagocytosis (an ability of only a few types of phagocytes). They move like tiny amoebas through the blood stream to the site of an injury where they either destroy the invader themselves, or produce antibodies that can. Please note that phagocytes cannot destroy viruses.

There are four major steps in phagocytosis:

1. Chemotaxis is the capacity to be attracted to a target and the ability to get there (motility). Vitamin C enhances motility, but excess zinc levels can suppress it.

2. Opsonization is the capacity to adhere to its target.

3. Engulfment is the capacity of the phagocyte to ingest its target.

4. Cidal capacity is the capacity to destroy the target.

In some cases, such as over-colonization by Candida albicans (yeast), phagocytes can perform the first three steps, but cannot perform the last and destroy its target.

The actual destruction of a phagocyte’s target is carried out by the phagocyte releasing strong free radicals (those things that age us that we battle with antioxidants), such as hydrogen peroxide and superoxide anion. Interestingly enough, the phagocyte must contain enough antioxidants to protect itself against its release of free radicals, or each attack will be a Kamikaze attack. Phagocytes store the antioxidants Vitamin C and the amino acid glutathione as protection, though it has been discovered that, in some scenarios, excessive amounts of vitamin C can suppress its cidal capacity (since the free radicals released to destroy a pathogen are quickly cleaned up before they can do their job). Thus, this tiny cell must regulate its own generation of antioxidants and free radicals to enable it to do its job and survive the battle.

There are many types of phagocytes, broken into two groups: myeloid cells (granulocytes) and monocytes. The granulocytes are cells filled with granules of toxic chemicals that digest the invaders. Examples of granulocytes are basophils, neutrophils, eosinophils, and mast cells. Monocytes are short-lived phagocytes that become various macrophages found throughout the body whose task it is to clean up the waste produced by the immune system as well as destroy pathogens (disease causing substances).

Macrophages (literally "big eaters" in Latin), eventually die (after eating their fill) producing the mucus and pus we find as the result of an infection. When you are all stuffed up and coughing up phlegm as the result of a cold, these cold symptoms (coughing) are the result of your immune system battling the cold virus (phlegm is dead immune cells). You should note that macrophages require the amino acid L-arginine to create the nitric oxide they use to destroy bacteria, viruses, and cancer cells. (Tumors protect themselves by producing the enzyme arginase that breaks down L-arginine; thus supplementing a cancer diet with L-arginine, according to studies in England, seems to be helpful. [Alternatives, November 1994; 5:17])

It has been discovered that every cell in our bodies has receptors, a spot where chemicals can attach themselves to the cells. Harvard researchers discovered that our immune system cells have neuropeptide receptors. Neuropeptides are the chemicals released by the brain when we feel good (from loving and being loved) and when we feel bad (from anger and frustration). The conclusion is very simple: our immune system is listening to and is affected by our emotional dialog.

Interferon, which is produced during viral infections, has been touted as the cancer cure of the century. However, tests show that sometimes it works like a magic bullet, and sometimes it doesn’t work at all. And the side effects, at times, can do you in.

Interferon is now synthesized in laboratories and sold at skyrocketing costs, but did you know that any viral infected cell can create it? There are many types of interferons, and their name derives from their function: the ability to interfere with viral infections. When a cell is attacked by a virus, though it cannot save itself, it can create an interferon that will warn other cells of an impending infection. Having been warned, the uninfected cells arm themselves with antiviral substances that keep the virus from replicating (reproducing themselves) in the uninfected cells. Top

Interleukins are hormones that carry messages between the immune cells to orchestrate the entire battle. One interleukin attracts T-cells to their targets and alert them to create interferon (if needed) and create another interleukin to create helper T-cells to kick the immune system into high gear and call in the natural killer cells and stimulate B-cells to produce antibodies. I

nterleukins have been widely used in cancer therapies, though not very effectively, and if the side effects don’t kill you, the cost might. But did you know there is a way to create millions of dollars of Interleukins naturally? Your body creates these wonderful chemicals whenever you do something the excites you, enthralls you, rings all your bells. If Magic Mountain in Disneyland is something that deeply excites you, one ride can be worth millions. Horse back riding, making love for hours, racing cars, watching a beautiful sunset: your key to a powerful immune system is the same key that turns your crank, so have fun!

Interferon and interleukin are classified as lymphokines, the substance (hormone) that infected cells and T-cells create to stimulate other cells in the immune system. Studies have shown that natural interferons and interleukins are extremely effective and have no side effects; as opposed to those that medical science introduces to fight disease, and this has the medical community baffled. It could take years to untie this knot.

Another recent discovery is TNF, or Tumor Necrosis Factor, a chemical produced by the macrophages to destroy tumors. In cancer patients, this can be a good thing, but studies have shown that over a long period of time, high TNF levels can lead to wasting and eventually death. This, according to some research we’ve uncovered, is one of the causes of the wasting syndrome in people with AIDS. TNF has been synthesized in the laboratory, and testing has begun on new therapies using TNF for cancer.

Finally we should mention hybridoma, a hybrid cell created when a lymphocyte fuses to a cancer cell and secretes either a lymphokine or an antibody specific for just one antigen. Hybridomas are currently being studied in laboratories that use stem cell assay, a process where a biopsy of cancerous tissue is cloned and experimented on. Once it is discovered which antibody the patient’s own immune system wants to create to fight the cancer, that antibody can be injected in large doses back into the patient to battle the cancer. Tests, however, are still incomplete.

Note: Though acupuncture has worked for six thousand years, our western medical community refused to accept it till they understood its workings (the mechanics behind it). This after witnessing a lung resection using only acupuncture as the anaesthetic! Additionally, the meridian system was not accepted until modern medical science, using high tech instruments and western methodologies actually "discovered" it. This is the materialism of the West: if you can’t count it, taste it, see it, it doesn’t exist. Our western scientists eventually discovered these meridians. The Chinese discovered them over six thousand years ago without the use of high tech.

When it comes to the immune system, auditing its mechanics and materials can be overkill, for as you will learn in the next article on the immune system, developing a powerful immune system can be as easy as asking.


References
Friedlander, Mark P., and Terry Phillips. Winning the War Within. Emmaus, PA: Rodale Press, Inc., 1986.
Heumer, Richard P. The Roots of Molecular Medicine. New York: W.H. Freeman & Company, 1986.
Principles of Molecular Medicine (Hardcover), by Marschall S. Runge (Editor), Cam Patterson (Editor)
Marchetti, Albert, M.D. Beating the Odds. New York: St. Martin’s Press, 1988.
Wade, Carlson. Immune Power Boosters. West Nyack, New York: Parker Publishing Company, 1990.