Modulation of hypoxia-induced calpain activity in rat renal proximal tubules

Kidney Int. 1996 Oct;50(4):1150-7. doi: 10.1038/ki.1996.422.


The effect of the newly developed, nonpeptide, calpain inhibitor, PD 150606, on hypoxia and ionomycin-induced increases in calpain activity in rat proximal tubules (PT) was determined. PD150606 inhibited both hypoxia and ionomycin-induced calpain activity as determined by the fluorescent substrate N-succinyl-Leu-Leu-Val-Tyr-7-amido-4-methyl coumarin (N-succinyl-Leu-Leu-Val-Tyr-AMC). This decrease in calpain activity was accompanied by dose-dependent cytoprotection against hypoxia and ionomycin-induced cell membrane damage. PD150606 had no effect on cathepsin B and L activity in PT as measured by the fluorescent substrate, benzyloxycarbonyl-L-phenylalanyl-L-arginine-7-amido-4-methyl coumarin (Z-Phe-Arg-AMC). The effects of low intracellular pH (pHi) or low free cytosolic calcium [Ca2+]i on this hypoxia-induced calpain activity were also determined. Both low pHi and low [Ca2+]i attenuated the hypoxia-induced increase in calpain activity. This attenuation of calpain activity was observed early before hypoxia-induced membrane damage and was associated with marked reduction in the typical pattern of hypoxia-induced cell membrane damage observed in this model. To identify the isoform of calpain activated in rat proximal tubules, normoxic, hypoxic and ionomycin treated tubules were fractionated by MONO-Q anion exchange chromatography and the fractions were assayed for calpain activity. A single peak of calpain activity characteristic of mu-calpain was found. The calcium dependency of the calpain activity was in the nanomolar range, further confirming that the activity was the low Ca(2+)-sensitive mu-calpain. The present study suggests that in rat proximal tubules: (1) PD 150606 is a specific inhibitor of calpain and not cathepsins B and L; (2) the cytoprotective effects of low pHi and low [Ca2+]i are mediated, at least in part, by inhibition of calpain activity; and (3) the predominant active form of calpain is the isoenzyme mu-calpain.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Acrylates / pharmacology
  • Analysis of Variance
  • Animals
  • Calcium / physiology
  • Calpain / antagonists & inhibitors
  • Calpain / chemistry
  • Calpain / metabolism*
  • Cathepsins / analysis
  • Dose-Response Relationship, Drug
  • Hydrogen-Ion Concentration
  • Hypoxia / metabolism*
  • In Vitro Techniques
  • Kidney Tubules, Proximal / enzymology*
  • L-Lactate Dehydrogenase / analysis
  • Male
  • Rats
  • Rats, Sprague-Dawley


  • Acrylates
  • PD 150606
  • L-Lactate Dehydrogenase
  • Cathepsins
  • Calpain
  • Calcium