A hapten is a
small moleculewhich can elicit an immune response only when attached to a large carrier such as a protein; the carrier may be one which also does not elicit an immune response by itself. (Generally, only large molecules, infectious agents, or insoluble foreign matter can elicit an immune responsein the body.)Once the body has generated antibodies to a hapten-carrier adduct, the small-molecule hapten may also be able to bind to the antibody, but it will usually not initiate an immune response; usually only the hapten-carrier adduct can do this. Sometimes the small-molecule hapten can even block immune response to the hapten-carrier adduct by preventing the adduct from binding to the antibody.
Examples of Haptens
A well known example of a hapten is
urushiol, which is the toxin found in poison ivy. When absorbed through the skin from a poison ivy plant, urushiol undergoes oxidationin the skin cells to generate the actual hapten, a reactive molecule called a quinonewhich then reacts with skin proteins to form hapten adducts. Typically the first exposure only causes sensitization, in which there is a proliferation of B cells able to make antibody to the hapten adduct. After a second exposure later, the proliferated B cells can become activated, generating an immune reaction producing the typical blisters of poison ivy exposure.
Some haptens can induce
autoimmunedisease. An example is hydralazine, a blood pressure lowering drug which occasionally can produce drug-induced lupus erythematosusin certain individuals. This also appears to be the mechanism by which the anaesthetic gas halothanecan cause a life-threatening hepatitis, as well as the mechanism by which penicillin-class drugs causes autoimmune hemolytic anemia.
Other haptens that are commonly used in molecular biology applications include
fluorescein, biotin, digoxigenin, and dinitrophenol
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