首页> 外文期刊>Life sciences >Cardiac atrial natriuretic peptide (ANP) in rat dams and fetuses developed in space (NIH-R1 and NIH-R2 experiments).
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Cardiac atrial natriuretic peptide (ANP) in rat dams and fetuses developed in space (NIH-R1 and NIH-R2 experiments).

机译:大鼠大坝和胎儿在空间中发育的心脏心钠素(ANP)(NIH-R1和NIH-R2实验)。

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NIH-R1 and R2 missions, conducted by NASA, allowed us to study the effects of the microgravitational environment 1) on cardiac ANP in pregnant rats, spaceflown for 11 days and dissected after a 2-day readaptation to Earth's gravity, after natural delivery, and 2) on maturation of cardiac ANP system in rat fetuses developed for 11 days in space and dissected on the day of landing, 2 days before birth. Immunocytochemical and electron microscopy analyses showed a typical formation of ANP-containing granules in atrial myocytes, in both dams and fetuses. Using competitive RT-PCR and radioimmunoassays, we observed that, after 2 days of readaptation to Earth's gravity, cardiac ANP biosynthesis of rat dams flown in space was increased by about twice, when compared to Synchronous and Vivarium Control rats. More obviously, rat fetuses developed in space and dissected on the day of landing displayed an altered maturation of cardiac ANP, evidenced by an increased mRNA biosynthesis (by about 6 fold, p<0.05), whereas the cardiac ANP storage was slightly reduced (by about twice, p<0.05) in both Flight and Synchronous Control groups, in comparison with Vivarium Control rats. These last results suggest that ANP metabolism during development is impacted by the microgravitational environment, but also by the housing conditions designed for space flight.
机译:由美国国家航空航天局(NASA)进行的NIH-R1和R2任务使我们能够研究微重力环境1)对怀孕大鼠心脏ANP的影响,进行空间飞行11天,并在与地球重力重合2天后自然解剖后解剖, 2)心脏ANP系统成熟的大鼠胎儿在太空中发育11天,并在着陆当天,出生前2天进行解剖。免疫细胞化学和电子显微镜分析显示,在大坝和胎儿的心房肌细胞中典型地形成了含ANP的颗粒。使用竞争性RT-PCR和放射免疫分析法,我们观察到,与同步和Vivarium对照大鼠相比,在重新适应地球重力2天后,在太空中飞行的大鼠大坝的心脏ANP生物合成增加了大约两倍。更明显的是,在空间发育并在着陆当天解剖的大鼠胎儿显示出心脏ANP的成熟改变,这可以通过mRNA生物合成的增加(约6倍,p <0.05)来证明,而心脏ANP的储存则略有减少(通过与Vivarium对照大鼠相比,在飞行和同步对照组中约有两倍,p <0.05)。这些最后的结果表明,在发育过程中ANP的代谢受微重力环境的影响,还受到为太空飞行而设计的居住条件的影响。

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