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Tin Protoporphyrin Provides Protection Following Cerebral Hypoxia-Ischemia: Involvement of Alternative Pathways

journal contribution
posted on 2023-05-19, 00:33 authored by Brad SutherlandBrad Sutherland, Shaw, OM, Clarkson, AN, Winburn, IC, Errington, AC, Dixon, CL, Lees, G, Sammut, IA, Appleton, I
The contribution of heme oxygenase (HO)-linked pathways to neurodegeneration following cerebral hypoxiaischemia (HI) remains unclear. We investigated whether HO modulators affected HI-induced brain damage and explored potential mechanisms involved. HI was induced in 26-day-old male Wistar rats by left common carotid artery ligation, followed by exposure to a humidified atmosphere of 8% oxygen for 1 hr. Tin protoporphyrin (SnPP; an HO inhibitor), ferriprotoporphyrin (FePP; an HO inducer), or saline was administered intraperitoneally once daily from 1 day prior to HI until sacrifice at 3 days post-HI. SnPP reduced (P < 0.05) infarct volume compared with saline-treated animals, but FePP had no effect on brain injury. SnPP did not significantly inhibit HO activity at 3 days post-HI, but SnPP increased (P < 0.001) total nitric oxide synthase (NOS) activity compared with HI 1 saline. Both inducible NOS and cyclooxygenase activities were attenuated (P < 0.05) by SnPP, whereas mitochondrial complex I and V activities were augmented (P < 0.05) by SnPP. SnPP had no effect on NMDA receptor currents. Overall, like other HO inhibitors, SnPP produced many nonselective effects, such as attenuation of inflammatory enzymes and increased mitochondrial respiratory function, which were associated with a protective response 3 days post-HI.

History

Publication title

Journal of neuroscience research

Volume

89

Pagination

1284-1294

ISSN

0360-4012

Department/School

Tasmanian School of Medicine

Publisher

Wiley

Place of publication

United States

Rights statement

Copyright 2011 Wiley-Liss,

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the health sciences

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