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Monoclonal antibody storage conditions, and concentration effects on immunohistochemical specificity

DR Ciocca, DJ Adams, RJ Bjercke, GW Sledge , DP Edwards, GC Chamness and WL McGuire

Monoclonal antibodies against a 24,000 dalton intracellular estrogen- regulated protein in human breast cancer cells were used to study storage conditions and the effects of monoclonal antibody concentrations on immunohistochemical antigen localization. Both hybridoma supernatants and ascites fluid obtained from mice injected with hybridoma cells were used as sources of monoclonal antibodies; the monoclonal antibodies in the ascites fluid were concentrated and purified. Both antibody preparations were stored at 4, -20, or -70 degrees C and periodically tested for activity at these storage conditions. There was no difference in activity for the antibodies between storage at -20 and -70 degrees C. However, when highly diluted antibody was stored at 4 degrees C, the activity was lost within 2 weeks if carrier proteins were not added. These monoclonal antibodies were applied to immunohistochemical staining of different mouse and human tissues processed for routine paraffin sections, using the avidin- biotin-peroxidase procedure. A monoclonal antibody of unrelated specificity was used as control. When these antibodies were used at high concentrations, all the different tissues examined were immunostained. With reduction of the antibody concentration, an immunohistochemical dissection of the tissues was seen until specific immunostaining was reached. When even more highly diluted monoclonal antibody was used, heterogeneity in the staining pattern became very high. On the basis of these results, certain immunohistochemical criteria are proposed for the selection of the optimum concentration of monoclonal antibodies for specific antigen detection.

Volume 31, Issue 5, pp. 691-696, 05/01/1983
Copyright © 1983 by The Histochemical Society


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D. Ciocca and M. Dufau
Estrogen-dependent Leydig cell protein recognized by monoclonal antibody to MCF-7 cell line
Science, October 26, 1984; 226(4673): 445 - 446.
[Abstract] [PDF]



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