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首页> 外文期刊>The European Journal of Neuroscience >Stress-mediated heart rate dynamics after deletion of the gene encoding corticotropin-releasing factor receptor 2.
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Stress-mediated heart rate dynamics after deletion of the gene encoding corticotropin-releasing factor receptor 2.

机译:删除促肾上腺皮质激素释放因子受体2的基因后,压力介导的心率动力学。

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摘要

The objective of the present study was to investigate the potential role of corticotropin-releasing factor receptor subtype 2 (CRFR2) in autonomic regulation of heart rate and heart rate variability under physiological conditions in conscious mice. Heart rate dynamics during novelty exposure and auditory fear conditioning were assessed by radiotelemetry. Heart rate responses and heart rate variability values were not different in CRFR2+/+ and CRFR2-/- mice during novelty exposure, which was associated with similar locomotor activity exhibited by both genotypes. The heart rate responses during retention of conditioned auditory fear were similar and the exponential relationship between heart rate and heart rate variability was independent of genotype. Pharmacological stimulation of the peripheral CRFR2beta by intraperitoneal injection of 200 ng human/rat corticotropin-releasing factor yielded a sustained tachycardia in wildtype control (CRFR2+/+) mice which was absent in CRFR2-deficient (CRFR2-/-) mice. Similarly, the tachycardia was effectively blocked by preinjection of the CRFR2 antagonist antisauvagine-30. In conclusion, the results indicate the involvement of CRFR2 in heart rate dynamics upon pharmacological stimulation but demonstrate that CRFR2 is not involved in baseline heart rate regulation and stress-mediated modulation of heart rate responses.
机译:本研究的目的是研究在有意识小鼠的生理条件下,促肾上腺皮质激素释放因子受体亚型2(CRFR2)在自主调节心率和心率变异性中的潜在作用。通过无线电遥测法评估新奇暴露和听觉恐惧条件下的心率动态。在新暴露期间,CRFR2 + / +和CRFR2-/-小鼠的心率响应和心率变异性值没有差异,这与两种基因型表现出的相似的运动活性有关。保留条件性听觉恐惧过程中的心率响应相似,并且心率与心率变异性之间的指数关系与基因型无关。腹膜内注射200 ng人/大鼠促肾上腺皮质激素释放因子对周围CRFR2beta的药理刺激在野生型对照(CRFR2 + / +)小鼠中产生持续的心动过速,而在缺少CRFR2(CRFR2-/-)的小鼠中则没有。同样,通过预注射CRFR2拮抗剂抗sauvagine-30可有效地阻断心动过速。总之,结果表明药理学刺激后CRFR2参与心率动态变化,但表明CRFR2不参与基线心率调节和应激介导的心率反应调节。

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