Neuronal HIF-1α and HIF-2α deficiency improves neuronal survival and sensorimotor function in the early acute phase after ischemic stroke

Hypoxia-inducible factors mediate adaptive responses to ischemia, among others, by induction of anti- and pro-survival genes. Thus, the impact of HIF on neuronal survival upon stroke is controversial. Therefore, neuron-specific knockout mice deficient for Hif1a and Hif2a were exposed to inspiratory...

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Main Authors: Barteczek, Philipp (Author) , Li, Lexiao (Author) , Ernst, Anne-Sophie (Author) , Böhler, Laura-Inés (Author) , Marti, Hugo (Author) , Kunze, Reiner (Author)
Format: Article (Journal)
Language:English
Published: 2017
In: Journal of critical care
Year: 2016, Volume: 37, Issue: 1, Pages: 291-306
ISSN:1557-8615
DOI:10.1177/0271678X15624933
Online Access:Verlag, Volltext: http://dx.doi.org/10.1177/0271678X15624933
Verlag, Volltext: https://doi.org/10.1177/0271678X15624933
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Author Notes:Philipp Barteczek, Lexiao Li, Anne-Sophie Ernst, Laura-Inés Böhler, Hugo H Marti and Reiner Kunze

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520 |a Hypoxia-inducible factors mediate adaptive responses to ischemia, among others, by induction of anti- and pro-survival genes. Thus, the impact of HIF on neuronal survival upon stroke is controversial. Therefore, neuron-specific knockout mice deficient for Hif1a and Hif2a were exposed to inspiratory hypoxia or ischemia-reperfusion injury. Both Hif1a- and Hif2a-deficient mice showed no altered infarct and edema size, suggesting that both HIF-α subunits might compensate for each other. Accordingly, hypoxic HIF-target gene regulation was marginally affected with exception of anti-survival Bnip3 and pro-survival erythropoietin. In the early acute stage upon stroke, Hif1a/Hif2a double knockout mice exhibited significantly reduced expression of the anti-survival Bnip3, Bnip3L, and Pmaip1. Accordingly, global cell death and edema were significantly reduced upon 24 h but not 72 h reperfusion. Behavioral assessment indicated that Hif1a/Hif2a-deficient mice initially performed better, but became significantly more impaired after 72 h accompanied by increased apoptosis and reduced angiogenesis. Our findings suggest that in neurons HIF-1 and HIF-2 have redundant functions for cellular survival under ischemic conditions. By contrast, lack of anti-survival factors in Hif1a/Hif2a-deficient mice might protect from early acute neuronal cell death and neurological impairment, indicating a benefit of HIF-pathway inhibition in neurons in the very acute phase after ischemic stroke. 
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