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Cardiovasc Res. 2006 Oct 1;72(1):143-51. Epub 2006 Jul 21.

Hyperoxic and hyperbaric-induced cardioprotection: role of nitric oxide synthase 3.

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  • 1Division of Pediatric Surgery, Medical College of Wisconsin, Milwaukee, WI 53226, USA. bgcab@yahoo.com

Abstract

OBJECTIVE:

The relative contributions of the fraction of inspired oxygen (FIO2) and atmospheric pressure (ATM) to cardioprotection are unknown. We determined whether the product of FIO2 x ATM (oxygen partial pressure) controls the extent of hyperoxic+hyperbaric-induced cardioprotection and involves activation of nitric oxide synthase (NOS).

METHODS:

Adult Sprague Dawley rats (n = 10/gp) were treated for 1 h with (1) normoxia+normobaria (21% O2 at 1 ATM), (2) hyperoxia+normobaria (100% O2 at 1 ATM), (3) normoxia+hyperbaria (21% O2 at 2 ATM) and (4) hyperoxia+hyperbaria (100% O2 at 2 ATM).

RESULTS:

Infarct size following 25 min ischemia and 180 min reperfusion was decreased following hyperoxia+normobaria and normoxia+hyperbaria compared with normoxia+normobaria and further decreased following hyperoxia+hyperbaria treatment. l-NAME (200 microM) reversed the cardioprotective effects of hyperoxia+hyperbaria. Nitrite plus nitrate content was increased 2.2-fold in rats treated with normoxia+hyperbaria and hyperoxia+hyperbaria. NOS3 protein increased 1.2-fold and association of hsp90 with NOS3 four-fold in hyperoxic+hyperbaric rats.

CONCLUSIONS:

Cardioprotection conferred by hyperoxia+hyperbaria is directly dependent on oxygen availability and mediated by NOS.

PMID:
16930572
DOI:
10.1016/j.cardiores.2006.06.031
[PubMed - indexed for MEDLINE]
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