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Characterization of monoclonal antibodies specific for rabbit renal brush-border hydrolases: application to immunohistological localization

M Tauc, F Chatelet, P Verroust, A Vandewalle, P Poujeol and P Ronco

INSERM U64, Hopital Tenon, Paris, France.

By use of immunodepletion studies, we characterized four monoclonal antibodies reactive with rabbit brush-border (BB) as specific for aminopeptidase N (AP), dipeptidylpeptidase IV (DPPIV), neutral endopeptidase (EP), and angiotensin-converting enzyme (ACE), and we used these antibodies for immunohistochemical detection of these four hydrolases. Expression within the kidney was studied by light and electron microscopy. All four hydrolases are expressed on the various segments of the proximal tubule. In addition, EP and DPPIV are detectable on visceral epithelial cells of the glomerulus and AP on the cells of Bowman's capsule. Outside the kidney, the four hydrolases are expressed within the digestive and genital tracts, where AP, EP, and DPPIV predominate on epithelial structures, whereas ACE is essentially located in vascular structures. The latter localization is also characteristic of ACE in the other organs studied, where clear-cut systematic distribution of the other hydrolases was often difficult to demonstrate. In addition, AP, DPPIV, and EP were detected on lymphoid cells. As compared to reports of data obtained essentially by enzymatic or immunoradiometric assays, these observations suggest considerable interspecies variations of extrarenal expression of the major BB hydrolases. This should be taken into account in attempting to define a general physiological role for a given enzyme.

Volume 36, Issue 5, pp. 523-532, 05/01/1988
Copyright © 1988 by The Histochemical Society


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