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Responsiveness of rat aorta and pulmonary artery to cGMP generators in the presence of thiol or heme oxidant.

Abstract：

:This study investigated the effects of thiol and heme oxidants on responsiveness to cGMP generators in isolated rat aorta and pulmonary artery using an organ chamber. The nitric oxide (NO) donor sodium nitroprusside (SNP)-induced relaxation was impaired by exposure to the thiol oxidant diamide in both the aorta and the pulmonary artery, whereas the soluble guanylate cyclase (sGC) stimulator BAY 41-2272- or the sGC activator BAY 60-2770-induced relaxation was not affected. The impairment by diamide of SNP-induced aortic and pulmonary arterial relaxation was completely restored by post-treatment with the thiol reductant dithiothreitol. However, regardless of the vessel type, the relaxant response to SNP or BAY 41-2272 was impaired by exposure to the heme oxidant ODQ, whereas the response to BAY 60-2770 was enhanced. The ODQ-induced effects were reversed partially by post-treatment with the heme reductant dithionite. These findings indicate that thiol oxidation attenuates only the vascular responsiveness to NO donors and that heme oxidation attenuates the responsiveness to NO donors and sGC stimulators but augments that to sGC activators. Therefore, under oxidative stress, the order of usability of the vasodilators is suggested to be: NO donors < sGC stimulators < sGC activators.

journal_name

J Pharmacol Sci

journal_title

Journal of pharmacological sciences

authors

Tawa M,Yamashita Y,Masuoka T,Nakano K,Yoshida J,Nishio M,Ishibashi T

doi

10.1016/j.jphs.2019.04.002

subject

Has Abstract

pub_date

2019-05-01 00:00:00

pages

43-47

issue

1

eissn

1347-8613

issn

1347-8648

pii

S1347-8613(19)30038-6

journal_volume

140

pub_type

杂志文章

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