Globulins

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Globulins

Globulins are immune molecules that are produced by the immune system in response to invasion of the body of agents that are perceived by the system as being foreign. Some immune globulins are also known as antibodies. Examples of microorganisms that stimulate globulin production are bacteria , viruses , molds, and parasites .

The production of globulins is triggered by the presence of the foreign material (antigen). Through an intricately coordinated series of events, the immune system responds to the presence of an antigen by the production of a corresponding globulin. There are three divisions of globulins, based on the movement of the molecules through a gel under the influence of an electric current (in other words, based on their size and their charge character). The three types are alpha, beta, and gamma globulins.

Alpha globulins are manufactured mainly in the liver. There are a number of so-called alpha-1 and alpha-2 globulins. The functions of these globulins includes the inhibition of an enzyme that digests protein, an inhibitor of two compounds vital in the clumping (coagulation) of blood, and a protein that can transport the element copper.

Alpha and beta globulins function as enzymes and proteins that transport compounds in the body. Gamma globulins act as the antibody defense against antigen invasion.

Beta globulins are also manufactured predominantly in the liver. Akin to the alpha type globulins, there are beta-1 and beta-2 globulins. Examples of beta globulins include a protein that binds iron in the body, factors involved with the immune targeting of foreign material for immune destruction, and a species of immunoglobulin antibody termed IgM.

Gamma globulins are manufactured in cells of the immune system known as lymphocytes and plasma cells. These globulins, which are known as IgM, IgA, and IgG, represent antibodies. Depending on the nature of the invading antigen, a specific immun globulin will be produced in great numbers by a specific lymphocyte or plasma cell. Infection with a different antigen will stimulate the production of a different immune globulin. As the infection eases, the production of the immun globulin will decrease.

The quantities of the various globulins in the blood can be diagnostic of malfunctions in the body or specific diseases. Examples of maladies that affect the globulin levels are chronic microbial infections, liver disease, autoimmune disorders , leukemias, and rheumatoid arthritis.

See also Immunity: active, passive, and delayed; Immunity, cell mediated; Immunity, humoral regulation; Immunochemistry; Immunogenetics; Immunoglobulins and immunoglobulin deficiency syndromes; Immunologic therapies; Immunological analysis techniques; Laboratory techniques in immunology

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globulin Any of a group of globular proteins that are generally insoluble in water and present in blood, eggs, milk, and as a reserve protein in seeds. Blood serum globulins comprise four types: α1-, α2-, and β-globulins, which serve as carrier proteins; and γ-globulins (gamma globulins), which include the immunoglobulins responsible for immune responses.

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globulin One of a group of globular, simple proteins, which are insoluble or only sparingly soluble in water, but soluble in dilute salt solutions. They occur in many animal tissues (e.g. blood plasma) and have a variety of functions (e.g. as components of antibodies).

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globulin (glob-yoo-lin) n. one of a group of simple proteins that are soluble in dilute salt solutions and can be coagulated by heat. serum g. any of the different globulins present in the blood, including gammaglobulins. Some have important functions as antibodies (see immunoglobulin). See also hormone-binding globulins.

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globulin One of a group of globular, simple proteins, which are insoluble or only sparingly soluble in water, but soluble in dilute salt solutions. They occur in plant seeds, where they have a variety of functions.

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globulins Globular (as opposed to fibrous) proteins that are relatively insoluble in water, but soluble in dilute salt solutions. They occur in blood (serum globulins, including immunoglobulins), milk (lactoglobulins), and some plants.