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Alpha-2 adrenergic receptors stimulate actin organization in developing fetal rat cardiac myocytes.

机译:Alpha-2肾上腺素能受体刺激发育中的胎鼠心脏心肌细胞中的肌动蛋白组织。

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Expression of alpha(2)-adrenergic receptors (alpha(2)-AR) is very high in fetal rat heart although numbers decline with increasing gestational age. The current experiments were designed to identify the subtypes of alpha(2)-AR expressed and the function of these receptors in fetal cardiac myocytes. Expression of alpha(2)A and alpha(2)C, but not alpha(2)B, was confirmed in the myocyte population by indirect immunofluorescence microscopy with subtype-specific antibodies and by Western blot. Both dexmedetomidine, an alpha(2)-selective agonist, and norepinephrine, increased actin cytoskeleton organization and this increase was blocked by the alpha(2)-selective antagonist, atipamezole. Furthermore, dexmedetomidine inhibited isoproterenol-stimulated cAMP accumulation in isolated fetal rat heart and this was blocked by rauwolscine. Therefore, functional alpha(2)A and alpha(2)B subtypes are present in the fetal rat heart where they may have a role in cardiac development.
机译:胎鼠心脏中的α(2)-肾上腺素能受体(α(2)-AR)的表达非常高,尽管其数目随着胎龄的增加而下降。当前的实验旨在识别胎儿心脏心肌细胞中表达的alpha(2)-AR的亚型以及这些受体的功能。通过亚型特异性抗体的间接免疫荧光显微镜和Western印迹证实了肌细胞群体中的alpha(2)A和alpha(2)C,但不是alpha(2)B的表达。右美托咪定,一个alpha(2)选择性激动剂,和去甲肾上腺素,都增加了肌动蛋白的细胞骨架组织,并且这种增加被alpha(2)选择性拮抗药阿替吡唑所阻止。此外,右美托咪定抑制了异丙肾上腺素刺激的cAMP在离体胎鼠心脏中的蓄积,这被劳沃斯汀所阻断。因此,功能性alpha(2)A和alpha(2)B亚型存在于胎鼠心脏中,它们可能在心脏发育中起作用。

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