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Iranian Journal of Basic Medical Sciences، جلد ۲۰، شماره ۷، صفحات ۷۷۶-۷۸۲
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عنوان انگلیسی Cardiovascular effects of nitrergic system of the pedunculopon-tine tegmental nucleus in anesthetized rats
چکیده انگلیسی مقاله Objective(s): Nitric oxide (NO) is an important neurotransmitter in central nervous system involved in central cardiovascular regulation. The presence of NO in the pedunculopontine tegmental (PPT) nucleus has been shown, but its cardiovascular effect has not been determined. In the present study, the cardiovascular effect of NO in the PPT nucleus was evaluated. Materials and Methods: After induction of anesthesia, a polyethylene catheter (PE-50) filled with heparinized saline inserted into the femoral artery, and the blood pressure (BP) and heart rate (HR) were continuously recorded. Animals were then placed in a stereotaxic apparatus and maximum changes of mean arterial pressure (∆MAP) and heart rate (∆HR) after microinjection of two doses of NG-nitro-L-arginine methyl ester (L-NAME, 30 and 90 nmol), L-arginine (L-Arg 10 and 50 nmol) and sodium nitroprusside (SNP, 9 and 27 nmol) into the PPT were provided and compared with control group (One-way ANOVA). Results: Both doses of L-NAME significantly increased ∆MAP compared to control (PP< 0.01, respectively). ∆HR only in higher dose (90 nmol) significantly increased compared to control (P< 0.05). Two doses of L-Arg (10 and 50 nmol/150 nl) had no significant effect on ∆MAP or ∆HR. Higher dose of SNP (27 nmol) significantly decreased ∆MAP (P< 0.05) and its both doses significantly decreased ∆HR compared to control (PP< 0.001, respectively). Effect of higher dose on ∆HR was significantly higher than the lower dose (P< 0.05). Conclusion: Our results show an inhibitory effect of the nitrergic system of the PPT on central cardiovascular system.
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نویسندگان مقاله محمدناصر شافعی | mohammad naser shafei
neurogenic inflammation research center, faculty of medicine, mashhad university of medical sciences, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

طاهره نیک یار | tahereh nikyar
department of physiology, faculty of medicine, mashhad university of medical science, mashhad, iran


محمود حسینی | mahmoud hosseini
neurocognitive research center, faculty of medicine, mashhad university of medical science, mashhad, iran


سعید نیازمند | saeed niazmand
neurogenic inflammation research center, faculty of medicine, mashhad university of medical sciences, iran|department of physiology, faculty of medicine, mashhad university of medical science, mashhad, iran

سازمان اصلی تایید شده: دانشگاه علوم پزشکی مشهد (Mashhad university of medical sciences)

مریم پاسبان | maryam paseban
department of physiology, faculty of medicine, mashhad university of medical science, mashhad, iran
نشانی اینترنتی http://ijbms.mums.ac.ir/article_9009.html
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زبان مقاله منتشر شده en
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نوع مقاله منتشر شده Original Article
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