The role of cysteine proteases in hypoxia-induced rat renal proximal tubular injury

Charles L. Edelstein, Eric D. Wieder, Muhammad M. Yaqoob, Patricia E. Gengaro, Thomas J. Burke, Raphael A. Nemenoff, Robert W. Schrier

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

The role of the lysosomal proteases cathepsins B and L and the calcium- dependent cytosolic protease calpain in hypoxia-induced renal proximal tubular injury was investigated. As compared to normoxic tubules, cathepsin B and L activity, evaluated by the specific fluorescent substrate benzyloxycarbonyl-L-phenylalanyl-L-arginine-7-amido-4-methylcoumarin, was not increased in hypoxic tubules or the medium used for incubation of hypoxic tubules in spite of high lactate dehydrogenase (LDH) release into the medium during hypoxia. These data in rat proximal tubules suggest that cathepsins are not released from lysosomes and do not gain access to the medium during hypoxia. An assay for calpain activity in isolated proximal tubules using the fluorescent substrate N-succinyl-Leu-Tyr-7-amido-4-methylcoumarin was developed. The calcium ionophore ionomycin induced a dose-dependent increase in calpain activity. This increase in calpain activity occurred prior to cell membrane damage as assessed by LDH release. Tubular calpain activity increased significantly by 7.5 min of hypoxia, before there was significant LDH release, and further increased during 20 min of hypoxia. The cysteine protease inhibitor N-benzyloxycarbonyl-Val-Phe methyl ester (CBZ) markedly decreased LDH release after 20 min of hypoxia and completely prevented the increase in calpain activity during hypoxia. The increase in calpain activity during hypoxia and the inhibitor studies with CBZ therefore supported a role for calpain as a mediator of hypoxia-induced proximal tubular injury.

Original languageEnglish (US)
Pages (from-to)7662-7666
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume92
Issue number17
DOIs
StatePublished - Aug 15 1995

Keywords

  • calcium
  • calpain
  • cathepsins

ASJC Scopus subject areas

  • General

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