Which antibodies are involved in immune response?

Antibodies are normally produced in response to a foreign protein or substance within the body, typically a pathogen, which is a infectious organism. Normally, the immune system is able to recognize and ignore the body's own cells and to not overreact to non-threatening substances in the environment, such as foods. Sometimes, however, the immune system ceases to recognize one or more of the body's normal constituents as "self," leading to production of autoantibodies. These autoantibodies attack the body's own cells, tissues, and/or organs, causing inflammation and damage.

Active and Passive Antibodies

Active immunization entails the introduction of a foreign molecule into the body, which causes the body itself to generate immunity against the target. This immunity comes from the T lymphocytes (T cells) and the B lymphocytes (B cells) with their antibodies. Vaccines are concentrations of infectious agents that are treated usually with heat or chemicals that render the organism impotent or incapable of causing infection. The vaccine with then trick the immune system into reacting and actively producing antibodies against the infectious organism.

Active immunization can occur naturally when a person comes in contact with, for example, a microbe. If the person has not yet come into contact with the microbe and has no pre-made antibodies for defense (like in passive immunization), the person becomes immunized. The immune system will eventually create antibodies and other defenses against the microbe. The next time, the immune response against this microbe can be very efficient; this is the case in many of the childhood infections that a person only contracts once, but then is immune.

Passive immunization is where pre-synthesized elements of the immune system are transferred to a person so that the body doesn't need to produce these elements itself. Currently, antibodies can be used for passive immunization. This method of immunization begins to work very quickly, but it's short lasting, because the antibodies are naturally broken down, and if there are no B cells to produce more antibodies, they will disappear. Passive antibodies are concentrated antibodies given in certain vaccines. Passive vaccines are given in cases in which there is not time for our immune system to produce antibodies after exposure.

IgA, IgM, and IgG Antibodies

Immunoglobulins (Ig) are antibodies and there are five major classes of antibodies: Immunoglobulin A (IgA), immunoglobulin G (IgG), immunoglobulin D (IgD), immunoglobulin M (IgM), and immunoglobulin E (IgE). Normally, the body contains ample amounts of each of these immunoglobulins, which are available for our body's needs for antibody production.

•IgG is the most abundant of the classes of immunoglobulins. It's the antibody for viruses, bacteria, and anti-toxins and found in most tissues and plasma.•IgM is the first antibody present in an immune response.•IgA is an early antibody for bacteria and viruses. It's found in saliva, tears, and all other mucous secretions.•IgD activity is not well understood.•IgE is present in the respiratory secretions. It's an anti-body for parasitic diseases, Hodgkin's disease, hay fever, atopic dermatitis, and allergic asthma).

Upon exposure to infectious organisms or vaccines, our immune systems quickly produce IgM and IgA antibodies, which are the earliest antibodies seen after infection or vaccination. Within weeks, the immune system begins to produce IgG antibodies. IgA and IgM antibodies are short acting and break down within a few weeks to months. IgG antibodies are long lasting, in most cases lasting for life.

In testing for infection or in diagnosing autoimmune conditions, tests for both IgM and IgG antibodies are often used. For instance, in suspected celiac disease, patients are tested for IgM and IgA gliadin antibodies. IgE antibodies develop during allergic responses and parasitic infections. Levels of IgE antibodies to specific allergens are used to diagnose allergic conditions. Because allergies stimulate the immune response, high levels of IgE tend to worsen or exacerbate symptoms in people who have autoimmune disorders. For instance, in patients with Graves' disease, higher levels of IgE are seen in people who have the worst symptoms or the most severe cases.

Immunoglobulin Deficiencies

Immunoglobulin deficiency syndromes are a group of disorders that involve defects of any component of the immune system or a defect of another system that affects the immune system, leading to an increased incidence or severity of infection. In these disorders, specific disease fighting antibodies (immunoglobulins such as IgG, IgA, and IgM) are either missing or are present in reduced levels. Children who have immunodeficiency syndromes may be subject to infection, diseases, disorders, or allergic reactions to a greater extent than individuals with fully functioning immune systems.

Autoantibodies

When the immune system is weak and ineffective, it reacts inappropriately. When the immune system erroneously reacts to the protein components of our body’s own tissues and cells, it produces autoantibodies. Autoantibodies that persist contribute to autoimmune disease development. Specific autoantibodies occur in specific autoimmune diseases.

The causes of autoantibody production are varied and not well understood. It's thought that some autoantibody production is due to a genetic predisposition combined with an environmental trigger, such as a viral illness or a prolonged exposure to certain toxic chemicals. There is generally not a direct genetic link however. While families may be susceptible to autoimmune conditions, individual family members may have different autoimmune disorders, or may never develop an autoimmune condition. Researchers believe that there may also be a hormonal component as many of the autoimmune conditions are much more prevalent in women of childbearing age.

Autoantibodies as Markers of Disease

Certain antibodies, such as the anti-nuclear antibodies (ANA), which include a number of different subtypes, are seen in many different autoimmune disorders. ANA can also be seen in low titers in people free of disease who show evidence of autoimmunity but no signs of disease.

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