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Endothelin-1, acting via the A receptor subtype, stimulates thymocyte proliferation in the rat.

机译:通过A受体亚型起作用的内皮素-1刺激大鼠胸腺细胞增殖。

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摘要

Endothelins (ETs) are a family of vasoactive peptides widely distributed in the body systems, where they carry out major autocrine/paracrine regulatory functions, acting through two main subtypes of receptors (ETA and ETB). Evidence suggests that ETs play a permissive role in the development of neural crest-derived craniofacial structures, among which the thymus. Therefore, we have investigated whether ETs regulate thymocyte proliferation in the adult rat ET-1 (which binds both ETA and ETB receptors) increased the mitotic index (% of metaphase-arrested cells) in the thymus cortex, while ET-3 (which preferentially binds ETB) and the selective ETB-receptor agonists BQ-3020 and IRL-1620 did not. The ETA-receptor antagonists BQ-123 and BQ-610, but not the ETB-receptor antagonist BQ-788, abolished the ET-1 effect. Moreover, BQ-123 and BQ-610, when administered alone, evoked a significant decrease in the mitotic index. Collectively, these findings clearly indicate that endogenous ETs, through the activation of ETA receptors, are involved in the maintenance and stimulation thymocyte proliferation in the adult rat, thereby playing a possible important role in the modulation of the immune-system functions.
机译:内皮素(ETs)是广泛分布于人体系统中的血管活性肽家族,它们通过两种主要的亚型受体(ETA和ETB)发挥主要的自分泌/旁分泌调节功能。有证据表明,ETs在神经c衍生的颅面结构(包括胸腺)的发育中起着宽松的作用。因此,我们研究了ETs是否调节成年大鼠ET-1(结合ETA和ETB受体)中的胸腺细胞增殖,从而增加了胸腺皮质的有丝分裂指数(中期停滞细胞的百分比),而ET-3(优先选择ET-3)结合ETB),而选择性ETB受体激动剂BQ-3020和IRL-1620没有。 ETA受体拮抗剂BQ-123和BQ-610而不是ETB受体拮抗剂BQ-788消除了ET-1的作用。而且,当单独施用时,BQ-123和BQ-610引起有丝分裂指数的显着降低。总体而言,这些发现清楚地表明,内源性ET通过激活ETA受体参与维持和刺激成年大鼠胸腺细胞的增殖,从而在免疫系统功能的调节中起重要作用。

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