Hemichannels in Cerebral Ischemia

Author(s): Panagiotis Bargiotas , Hannah Monyer , Markus Schwaninger .

Journal Name: Current Molecular Medicine

Volume 9 , Issue 2 , 2009

Become EABM
Become Reviewer

Abstract:

Hemichannels are transmembrane channels that represent the functional subunits of gap junctions. Each hemichannel is composed of a connexin or pannexin hexamer and, after being transported to the membrane, remains unpaired until it is incorporated in a gap junction. Several studies have already provided evidence that gap junction-mediated intercellular diffusion of ions and small molecules during ischemia represents an important mechanism through which necrotic, apoptotic, or even protective signals are transported between cells. Although initially hemichannels were supposed to be functional only in gap junctions, recent findings indicate that unpaired hemichannels also display a large array of activities that can be modulated under several pathophysiological conditions, including ischemia. Open hemichannels in ischemia dramatically alter the permeability properties of membranes and lead to cell death through ionic dysregulation, loss of metabolites, and changes in intracellular ATP. This review focuses on the properties and possible functions of unpaired connexin and pannexin hemichannels and the implications this has for a variety of events, such as cell death, glutamate release, oxidative stress, cortical spreading depression, that occur during an ischemic insult and may affect its outcome.

Keywords: Cerebral ischemia, stroke, connexin, pannexins, hemichannel, gap junction

Rights & PermissionsPrintExport Cite as

Article Details

VOLUME: 9
ISSUE: 2
Year: 2009
Page: [186 - 194]
Pages: 9
DOI: 10.2174/156652409787581646
Price: $58

Article Metrics

PDF: 15