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Acute connexin43 temporal and spatial expression in response to ischemic stroke.

Abstract：

:Connexin43 (Cx43) gap junctions expressed in astrocytes can significantly impact neuronal survival in stroke. However, little is known regarding Cx43 spatial and temporal expression during the initial stages of brain ischemia. Using immunohistochemistry and Western blot analysis, we examined Cx43 spatial and temporal expression as a function of neuronal injury within the first 24 h after permanent middle cerebral artery occlusion (pMCAO). Western blot analysis showed a significant increase in Cx43 protein expression in the core ischemic area at 2 and 3 h after pMCAO. However, after 6 h of pMCAO Cx43 levels were significantly reduced. This reduction was due to cell death and concomitant Cx43 degradation in the expanding focal ischemic region, while the peri-infarct zone revealed intense Cx43 staining. The neuronal cell-death marker Fluoro-Jade C labeled injured neurons faintly at 1 h post-pMCAO with a time-dependent increase in both intensity and size of punctate staining. In addition, decreased microtubule-associated protein 2 (MAP2) immunoreactivity and thionin staining similarly indicated cell damage beginning at 1 h after pMCAO. Taken together, Cx43 expression is sensitive to neuronal injury and can be detected as early as 2 h post-pMCAO. These findings underscore Cx43 gap junction as a potential early target for therapeutic intervention in ischemic stroke.

journal_name

J Cell Commun Signal

journal_title

Journal of cell communication and signaling

authors

Freitas-Andrade M,She J,Bechberger J,Naus CC,Sin WC

doi

10.1007/s12079-017-0430-6

subject

Has Abstract

pub_date

2018-03-01 00:00:00

pages

193-204

issue

1

eissn

1873-9601

issn

1873-961X

pii

10.1007/s12079-017-0430-6

journal_volume

12

pub_type

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