کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10739624 | 1046882 | 2005 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Increased superoxide anion in rostral ventrolateral medulla contributes to hypertension in spontaneously hypertensive rats via interactions with nitric oxide
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کلمات کلیدی
cGMPMSAPiNOSODQeNOSMnTBAPaCSFO2-nNOSMnSODAdGFPguanosine 3′,5′-cyclic monophosphate - guanosine 3 '، 5'-cyclic monophosphateHET - ITsuperoxide anion - آنیون سوپر اکسیدmean systemic arterial pressure - به معنی فشار شریانی سیستمیک استinducible nitric oxide synthase - سنتاز اکسید نیتریک القاییendothelial nitric oxide synthase - سنتاز اکسید نیتریک اندوتلیالneuronal nitric oxide synthase - سنتاز اکسید نیتریک عصبیmanganese superoxide dismutase - سوپر اکسید دیسموتاز منگنزHeart rate - ضربان قلبmean arterial pressure - فشار متوسط شریانیartificial cerebrospinal fluid - مایع مغزی نخاعی مصنوعیCu/ZnSOD - مس / ZnSODmap - نقشهNitric oxide - نیتریک اکسیدHydroethidine - هیدروتیدین
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
سالمندی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Oxidative stress because of an excessive production of superoxide anion (O2-) is associated with hypertension. The present study evaluated the hypothesis that in the rostral ventrolateral medulla (RVLM), where the premotor neurons for the maintenance of vascular vasomotor activity are located, increased O2- contributes to hypertension in spontaneously hypertensive rats (SHR) by modulating the cardiovascular depressive actions of nitric oxide (NO). Compared with normotensive Wistar-Kyoto (WKY) rats, SHR manifested significantly increased basal O2- production, along with reduced manganese superoxide dismutase (MnSOD) expression and activity, in the RVLM. The magnitude of hypotension, bradycardia, or suppression of sympathetic neurogenic vasomotor tone elicited by microinjection bilaterally into the RVLM of a membrane-permeable SOD mimetic, Mn(III)-tetrakis-(4-benzoic acid) porphyrin (MnTBAP), was also significantly larger in SHR. Transfection bilaterally into the RVLM of adenoviral vectors encoding endothelial nitric oxide synthase resulted in suppression of arterial pressure, heart rate, and sympathetic neurogenic vasomotor tone in both WKY rats and SHR. Microinjection of MnTBAP into the RVLM of SHR further normalized those cardiovascular parameters to the levels of WKY rats. We conclude that an elevated level of O2- in the RVLM is associated with hypertension in SHR. More importantly, this elevated O2- may contribute to hypertension by reducing the NO-promoted cardiovascular depression.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Free Radical Biology and Medicine - Volume 38, Issue 4, 15 February 2005, Pages 450-462
Journal: Free Radical Biology and Medicine - Volume 38, Issue 4, 15 February 2005, Pages 450-462
نویسندگان
Ming-Hong Tai, Ling-Lin Wang, Kay L.H. Wu, Julie Y.H. Chan,