A peptide inhibitor of cytochrome c/inositol 1,4,5-trisphosphate receptor binding blocks intrinsic and extrinsic cell death pathways

Darren Boehning, Damian B. Van Rossum, Randen L. Patterson, Solomon H. Snyder

Research output: Contribution to journalArticle

101 Scopus citations


Apoptotic stimuli augment intracellular calcium concentration through inositol 1,4,5-trisphosphate receptors (IP3R) on endoplasmic reticulum calcium stores. We previously discovered an apoptotic cascade wherein cytochrome c binds to IP3R early in apoptosis, resulting in dysregulated calcium release. Here we show that cytochrome c binding to IP 3R depends on a cluster of glutamic acid residues within the C terminus of the channel. A cell permeant peptide derived from this sequence displaces cytochrome c from IP3R and abrogates cell death induced by staurosporine treatment of HeLa cells and Fas ligand stimulation of Jurkat cells. Small-molecule inhibitors of cytochrome c/IP3R interactions may prove useful in treating disorders associated with inappropriate intrinsic and extrinsic apoptotic signaling.

Original languageEnglish (US)
Pages (from-to)1466-1471
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number5
StatePublished - Feb 1 2005
Externally publishedYes



  • Apoptosis
  • Calcium
  • Caspase
  • Fas
  • T lymphoma

ASJC Scopus subject areas

  • Genetics
  • General

Cite this