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A blocking antibody is an antibody that does not have a reaction when combined with an antigen, but prevents other antibodies from combining with that antigen. [1] This function of blocking antibodies has had a variety of clinical and experimental uses. The term can also be used for inhibiting antibody, prozone phenomenon and, agglutination ...
Non-neutralizing antibodies can be important to flag the particle for immune cells, signaling that it has been targeted, after which the particle is processed and consequently destroyed by recruited immune cells. [9] Neutralizing antibodies on the other hand can neutralize the biological effects of the antigen without a need for immune cells.
Illustration of the effects of excess antigen and blocking antibodies on immunoassays. In an agglutination test, a person's serum (which contains antibodies) is added to a test tube, which contains a particular antigen. If the antibodies interact with the antigen to form immune complexes, called agglutination, then the test is interpreted as ...
The production of such cross-reactive, but non-neutralizing antibodies could enable severe secondary infections. By binding to but not neutralizing the virus, these antibodies cause it to behave as a "trojan horse", [43] [44] [45] where it is delivered into the wrong compartment of dendritic cells that have ingested the virus for destruction.
The patient may develop neutralizing antibodies reducing the effectiveness of muromonab-CD3. Muromonab-CD3 can cause excessive immunosuppression. Although CD3 antibodies act more specifically than polyclonal antibodies, they lower the cell-mediated immunity significantly, predisposing the patient to opportunistic infections and malignancies. [6]
[4] [9] Adverse effects may be class-dependent, and so switching to a biologic of another class may ameliorate those effects. [ 7 ] Potential serious adverse effects include allergic reactions , liver damage, cancer, and serious infections including tuberculosis , pneumonia , staph infection , and fungal infection .
These high affinity human monoclonal antibodies can be produced within a month after vaccination and because of their human origin, they will have very little, if any, antibody-related side-effects in humans. They can potentially be used to develop passive antibody therapy against influenza virus transmission.
Polyclonal antibodies (pAbs) are antibodies that are secreted by different B cell lineages within the body (whereas monoclonal antibodies come from a single cell lineage). They are a collection of immunoglobulin molecules that react against a specific antigen , each identifying a different epitope .