Molecular mechanisms for NOSs-mediated responses in microvessels

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We demonstrated that bone marrow (BM) plays an important role in modulating microvascular endothelial and metabolic functions. We used male eNOS(-/-) mice which were transplanted with BM cells from wild-type (WT) or eNOS(-/-) mice. We demonstrated that endothelium-dependent relaxations and hyperpolarizations of mesenteric arteries to acetylcholine were reduced in eNOS(-/-) mice and were markedly improved when transplanted with WT-BM but not with eNOS(-/-)-BM. The enhanced component of endothelium-dependent relaxations was abolished by catalase, indicating that the improved responses were mediated by H_2O_2. In contrast, no such beneficial effect was noted in the aorta.