Association of 14-3-3gamma and phosphorylated bad attenuates injury in ischemic astrocytes

J Cereb Blood Flow Metab. 2005 Mar;25(3):338-47. doi: 10.1038/sj.jcbfm.9600032.

Abstract

Our recent findings indicate an induced upregulation of 14-3-3gamma mRNA and protein in ischemic cortical astrocytes. Despite being brain-specific, the functional role of 14-3-3gamma in the brain still remains largely unknown. In this study, we show that among all the 14-3-3 isoforms, only the gamma isoform is inducible under ischemia in astrocytes. Furthermore, this upregulation of 14-3-3gamma may play a specific protective role in astrocytes under ischemia. Overexpression experiments and antisense treatment show that an elevation of 14-3-3gamma protein in astrocytes promotes survival, while a decrease in 14-3-3gamma enhances apoptosis in astrocytes under ischemia. Under ischemia, endogenous 14-3-3gamma binds p-Bad, thus preventing Bad from entering mitochondria to initiate apoptosis. Therefore, 14-3-3gamma is selectively induced during ischemia to protect astrocytes from apoptosis through p-Bad-related signaling.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • 14-3-3 Proteins / metabolism*
  • Animals
  • Apoptosis / genetics
  • Apoptosis / physiology
  • Astrocytes / metabolism*
  • Astrocytes / pathology
  • Brain Ischemia / metabolism*
  • Brain Ischemia / pathology
  • Brain Ischemia / prevention & control*
  • Carrier Proteins / metabolism*
  • Mice
  • Mice, Inbred ICR
  • Phosphorylation
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • bcl-Associated Death Protein

Substances

  • 14-3-3 Proteins
  • Bad protein, mouse
  • Carrier Proteins
  • RNA, Messenger
  • bcl-Associated Death Protein