Abstract
Purified lactate dehydrogenase (LDH) isoenzyme 1 (H or B subunits) and isoenzyme 5 (M or A subunits) were used to prepare monoclonal antibodies (MAb) suitable for immunohistochemical detection on formalin fixed paraffin-embedded tissue sections. In the initial fusions, screening of the antibodies was based on enzyme linked immunosorbent assay (ELISA) against the immunogens. None of the antibodies obtained was satisfactory. There were various problems related to specificity, crossreactivity, affinity and also the properties of the monoclonal antibody itself. Using a combined system involving more than one method for screening, two suitable monoclonal antibodies, MAb65 (to H-type LDH) and MAb25 (to M-type LDH) were selected. Both antibodies reacted specifically with corresponding LDH isoenzymes as shown in a series of tests. Their reactivity in sections of formalin fixed paraffin-embedded tissue indicated that both antibodies are suitable reagents for immunohistochemical studies.
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