In:
Frontiers in Cellular Neuroscience, Frontiers Media SA, Vol. 17 ( 2023-9-8)
Kurzfassung:
Experimental studies suggest that ischemic postconditioning interferes with cell death mechanisms and reduces infarction during the acute phase after focal cerebral ischemia. Postconditioning may be a practically feasible way to promote stroke recovery, but many drawbacks prevent its clinical translation. First, all existing studies are mostly on acute 24 h outcomes. Second, the mechanisms of protection and augmented long-term benefits remain unclear. Our study aims to define some of the mechanisms that explain long-term benefits of improved recovery. Methods Male Sprague–Dawley rats were subjected to 100-min transient middle cerebral artery occlusion (MCAO) or postconditioning (100-min middle cerebral artery occlusion plus 10-min reperfusion plus 10-min reocclusion). After 3 days or 2 weeks, infarct volumes, western blot, and immunohistochemical markers of neurogenesis and angiogenesis were quantified. Fluorocitrate (FC) or saline were administrated ICV (intraventricular injection) every other day starting on day 5 after focal cerebral ischemia, animals were recovered for 2 weeks. Results After postconditioning BDNF protein expression levels increased compared to animals subjected to MCAO. Immunostaining showed that BDNF increased specifically in astrocytes. Moreover, when astrocytes were metabolically inhibited by fluorocitrate the postconditioning neuroprotective effect together with the postconditioning-dependent new angiogenesis and neurogenesis, were no longer observed. Conclusion These results suggest for the first time that therapeutic effects of postconditioning may involve the promotion of neurogenesis and angiogenic remodeling, via BDNF released by astrocytes, during the recovery phase after focal cerebral ischemia.
Materialart:
Online-Ressource
ISSN:
1662-5102
DOI:
10.3389/fncel.2023.1260389
DOI:
10.3389/fncel.2023.1260389.s001
DOI:
10.3389/fncel.2023.1260389.s002
DOI:
10.3389/fncel.2023.1260389.s003
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10.3389/fncel.2023.1260389.s004
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10.3389/fncel.2023.1260389.s005
DOI:
10.3389/fncel.2023.1260389.s006
DOI:
10.3389/fncel.2023.1260389.s007
DOI:
10.3389/fncel.2023.1260389.s008
DOI:
10.3389/fncel.2023.1260389.s009
DOI:
10.3389/fncel.2023.1260389.s010
DOI:
10.3389/fncel.2023.1260389.s011
DOI:
10.3389/fncel.2023.1260389.s012
DOI:
10.3389/fncel.2023.1260389.s013
DOI:
10.3389/fncel.2023.1260389.s014
DOI:
10.3389/fncel.2023.1260389.s015
DOI:
10.3389/fncel.2023.1260389.s016
Sprache:
Unbekannt
Verlag:
Frontiers Media SA
Publikationsdatum:
2023
ZDB Id:
2452963-1