Epitope analysis of the oncofetal antigen alphafetoprotein using monoclonal antibodies

Chakraborty, Mala ; Mandal, Chitra ; Mandal, Chhabinath (1991) Epitope analysis of the oncofetal antigen alphafetoprotein using monoclonal antibodies Molecular Immunology, 28 (7). pp. 703-710. ISSN 0161-5890

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/016158...

Related URL: http://dx.doi.org/10.1016/0161-5890(91)90112-W


Alphafetoprotein (AFP), an oncofetal antigen, plays very important roles in the early embryonic life and oncogenesis. Under various physiological and pathological conditions AFP exhibits microheterogeneity, probably as a result of differential expression of its epitopes. To analyse the epitopes we have developed a panel of monoclonal antibodies against human AFP purified by a new and efficient method using an immunoadsorbent consisting of polyclonal antibodies immobilized on cyanogen bromide activated Sepharose. Clones producing antibodies of various isotypes, e.g. IgG1, IgG2a, IgG2b. IgA and IgM have been subcloned and characterized. The antibodies showed high avidity for AFP (with half-maximal binding concentrations between 0.012 and 3.87 nM). Mutual inhibition efficiencies of a panel of 14 monoclonal antibodies were determined by RIA. Based on these inhibition data a computer program was used to group these antibodies with respect to their "epitope specificity distance". As a result of this grouping, clones have been identified which can recognize at least five different epitopes on AFP. This panel of antibodies may be very useful for analysis of the epitoplc variation of AFP under various physiological and pathological conditions.

Item Type:Article
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ID Code:19298
Deposited On:23 Nov 2010 13:10
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