Characterization of Monoclonal Antibody to L-Homocysteic Acid and Its Immunohistochemistry in Rat Hippocampus / 华中科技大学学报（医学）（英德文版）

ABSTRACT

L-homocysteic acid (HCA) and other amino acids were conjugated to rat brain material ( extracted rat brain protein) with glutaraldehyde to form HCA- and amino acids-brain material con-jugates. The specificity of monoclonal antibody (McAb) was tested on serial dilution test and ab-sorption test on enzyme- linked immunosorbent assay (ELISA) using these conjugates as antigens instead of amino acids-BSA (bovine serum albumin) conjugates used previously. The characterized McAb was applied for immunohistochemical staining using PAP (peroxidase antiperoxidase) tech-nique in combination with silver enhancement of diamino-benzene (DAB) products. The results in-dicated that McAb to L-HCA reacted with L-HCA-brain material conjugates, but not with other a-mino acids-brain material conjugates so far tested. McAb absorbed with L-HCA-brain material a-bolished or decreased immunoreactivity of L-HCA-brain material with McAb. The antibody selec-tively stained subpopulation of cells and processes in the hippocampus fixed with glutaradehyde. Absorption of McAb with L-HCA-brain material abolished immunohistochemical staining. These results suggested that McAb was specific for L-HCA-brain materials and could be used for imuno-histocytochemistry. This would provide a new tool for immunohistochemical visualization and locali-zation of L-HCA in the nervous system.