Abstract
Vanadate (10 mM) strongly inhibited endogenous protein degradation as well as the degradation of an exogenous, endocytosed protein (asialofetuin) in isolated rat hepatocytes. Protein synthesis and cellular viability were unaffected, but changes in cell morphology suggested some interference with cytoskeletal elements. The effect of vanadate was comparable to the effects of several other degradation inhibitors (lysosomotropic amines, leupeptin, vinblastine, amino acids, dimethylaminopurine riboside) known to inhibit the autophagic/lysosomal pathway of protein degradation. Vanadate inhibited proteolysis in a liver homogenate at pH 5, suggesting a direct effect upon the lysosomal proteinases.
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