Influences of prostanoids and nitric oxide on post-suspension hypotension in female Sprague–Dawley rats

IF 3
D. Eatman, R.A. Listhrop, A.S. Beasley, R.R. Socci, I. Abukhalaf, M.A. Bayorh
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引用次数: 0

Abstract

Impairment in cardiovascular functions sometimes manifested in astronauts during standing postflight, may be related to the diminished autonomic function and/or excessive production of endothelium-dependent relaxing factors. In the present study, using the 30° head-down tilt (HDT) model, we compared the cardiovascular and biochemical effects of 7 days of suspension and a subsequent 6-h post-suspension period between suspended and non-suspended conscious female Sprague–Dawley rats. Mean arterial pressure (MAP) and heart rate were measured prior to suspension (basal), daily thereafter, and every 2 h post-suspension. Following 7 days of suspension, MAP was not different from their basal values, however, upon release from suspension, MAP was significantly reduced compared to the non-suspended rats. Nitric oxide levels were elevated while thromboxane A2 levels declined significantly in both plasma and tissue samples following post-suspension. The levels of prostacyclin following post-suspension remained unaltered in plasma and aortic rings but was significantly elevated in carotid arterial rings. Therefore, the post-suspension reduction in mean arterial pressure is due mostly to overproduction of nitric oxide and to a lesser extent prostacyclin.
前列腺素和一氧化氮对雌性Sprague-Dawley大鼠悬浮后低血压的影响。
宇航员在飞行后站立时出现的心血管功能损伤可能与自主神经功能减弱和/或内皮依赖性放松因子的过度产生有关。在本研究中,我们使用30度头下倾斜(HDT)模型,比较了悬浮和非悬浮清醒雌性Sprague-Dawley大鼠在悬浮7天和悬浮后6小时的心血管和生化影响。平均动脉压(MAP)和心率分别在悬浮前(基础)、之后每天和悬浮后每2h测量一次。在悬浮7天后,MAP与基础值没有差异,但在释放后,MAP与未悬浮的大鼠相比显著降低。悬浮后血浆和组织样本中的一氧化氮水平升高,而血栓素A(2)水平显著下降。悬浮后血浆和主动脉环中的前列环素水平保持不变,但颈动脉环中的前列环素水平明显升高。因此,悬液后平均动脉压的降低主要是由于一氧化氮的过量产生,在较小程度上是由于前列环素。
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来源期刊
Prostaglandins, leukotrienes, and essential fatty acids
Prostaglandins, leukotrienes, and essential fatty acids Clinical Biochemistry, Endocrinology, Diabetes and Metabolism
CiteScore
5.30
自引率
0.00%
发文量
0
审稿时长
64 days
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