Cleavage of human cytosolic phospholipase A2 by caspase-1 (ICE) and caspase-8 (FLICE)

Biochem Biophys Res Commun. 1998 Dec 9;253(1):92-8. doi: 10.1006/bbrc.1998.9754.

Abstract

The activation of caspases appears to play a key role in programmed cell death. An increasing number of substrates have been identified that are cleaved by caspases. In a previous study, we have reported that human cPLA2 is proteolytically inactivated during apoptosis through cleavage by a caspase-3-like activity. Here, we show that in cotransfection experiments the previously identified cleavage site at Asp522 can be used by a wide variety of caspases belonging to different subfamilies. The formation of additional fragments implied differences in cleavage site usage between the closely related caspases-3 and -7. A different cleavage pattern of cPLA2 was observed with caspase-1. Mutational analysis identified the caspase-1 cleavage site at Asp459 within the sequence YQSD/N. Most interestingly, we found that even caspase-8, an upstream component of the proposed caspase cascade, cleaves cPLA2 in vitro. The presence of multiple cleavage sites warrants proteolysis and inactivation of the proinflammatory cPLA2 during apoptosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apoptosis / genetics
  • Caspase 1 / biosynthesis
  • Caspase 1 / genetics
  • Caspase 1 / metabolism*
  • Caspase 8
  • Caspase 9
  • Caspases / biosynthesis
  • Caspases / genetics
  • Caspases / metabolism*
  • Cell Line
  • Cytosol / enzymology*
  • Enzyme Activation / genetics
  • Humans
  • Hydrolysis
  • Kidney
  • Phospholipases A / metabolism*
  • Phospholipases A2
  • Recombinant Proteins / metabolism
  • Transfection

Substances

  • Recombinant Proteins
  • Phospholipases A
  • Phospholipases A2
  • CASP8 protein, human
  • CASP9 protein, human
  • Caspase 8
  • Caspase 9
  • Caspases
  • Caspase 1