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. 1981 Jul 15;198(1):177–186. doi: 10.1042/bj1980177

Induction, immunochemical identity and immunofluorescence localization of an 80000-molecular-weight peroxisome-proliferation-associated polypeptide (polypeptide PPA-80) and peroxisomal enoyl-CoA hydratase of mouse liver and renal cortex

Narendra D Lalwani 1, M Kumudavalli Reddy 1, Mai Mangkornkanok-Mark 1, Janardan K Reddy 1,*
PMCID: PMC1163224  PMID: 6798973

Abstract

The hypolipidaemic drugs methyl clofenapate, BR-931, Wy-14643 and procetofen induced a marked proliferation of peroxisomes in the parenchymal cells of liver and the proximal-convoluted-tubular epithelium of mouse kidney. The proliferation of peroxisomes was associated with 6–12-fold increase in the peroxisomal palmitoyl-CoA oxidizing capacity of the mouse liver. Enhanced activity of the peroxisomal palmitoyl-CoA oxidation system was also found in the renal-cortical homogenates of hypolipidaemic-drug-treated mice. The activity of enoyl-CoA hydratase in the mouse liver increased 30–50-fold and in the kidney cortex 3–5-fold with hypolipidaemic-drug-induced peroxisome proliferation in these tissues, and over 95% of this induced activity was found to be heat-labile peroxisomal enzyme in both organs. Sodium dodecyl sulphate/polyacrylamide-gel-electrophoretic analysis of large-particle and microsomal fractions obtained from the liver and kidney cortex of mice treated with hypolipidaemic peroxisome proliferators demonstrated a substantial increase in the quantity of an 80000-mol.wt. peroxisome-proliferation-associated polypeptide (polypeptide PPA-80). The heat-labile peroxisomal enoyl-CoA hydratase was purified from the livers of mice treated with the hypolipidaemic drug methyl clofenapate; the antibodies raised against this electrophoretically homogeneous protein yielded a single immunoprecipitin band with purified mouse liver enoyl-CoA hydratase and with liver and kidney cortical extracts of normal and hypolipidaemic-drug-treated mice. These anti-(mouse liver enoyl-CoA hydratase) antibodies also cross-reacted with purified rat liver enoyl-CoA hydratase and with the polypeptide PPA-80 obtained from rat and mouse liver. Immunofluorescence studies with anti-(polypeptide PPA-80) and anti-(peroxisomal enoyl-CoA hydratase) provided visual evidence for the localization and induction of polypeptide PPA-80 and peroxisomal enoyl-CoA hydratase in the liver and kidney respectively of normal and hypolipidaemic-drug-treated mice. In the kidney, the distribution of these two proteins is identical and limited exclusively to the cytoplasm of proximal-convoluted-tubular epithelium. The immunofluorescence studies clearly complement the biochemical and ultrastructural observations of peroxisome induction in the liver and kidney cortex of mice fed on hypolipidaemic drugs. In addition, preliminary ultrastructural studies with the protein-A–gold-complex technique demonstrate that the heat-labile hepatic enoyl-CoA hydratase is localized in the peroxisome matrix.

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