Hsp27 is a mediator of sustained smooth muscle contraction in response to bombesin.

Hsp27 is a mediator of sustained smooth muscle contraction in response to bombesin.
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Hsp27 是响应铃蟾肽而持续平滑肌收缩的介质。

DOI:
10.1016/0006-291x(91)92065-r
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发表时间:
1991
影响因子:
3.1
通讯作者:
Strahler,JR
Strahler,JR
中科院分区:
生物学4区
文献类型:
--
作者:
Bitar,KN;Kaminski,MS;Hailat,N;Cease,KB;Strahler,JR

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我们已经确定低分子量27kD热休克蛋白是平滑肌的主要磷蛋白成分,并研究了它在激动剂诱导的平滑肌收缩中的潜在作用。存在于肛门直肠区神经元中的神经肽蛙皮素和P物质,通过激活不同的细胞内通路,诱导该区域分离的平滑肌细胞收缩。P物质引起的收缩依赖于1,4,5-三磷酸肌醇(IP3)/钙调素,而蛙皮素引起的收缩是由蛋白激酶C(PKC)依赖的途径介导的。用抗Hsp27的单抗预先孵育细胞,可阻断蛙皮素或外源性PKC引起的持续收缩,而P物质或IP3诱导的短暂收缩不受抗体的影响。与同种类型匹配的对照抗体预孵育,对所用药物引起的收缩没有抑制作用。这些数据支持Hsp27在蛙皮素或PKC诱导的非钙调蛋白介导的持续收缩中的新作用。
We have identified the low MW 27 kD heat shock protein as a major phosphoprotein constituent of smooth muscle and have investigated its potential role in agonist induced smooth muscle contraction. The neuropeptides bombesin and substance P, which are present in neurons of the anorectal region, induce contraction of isolated smooth muscle cells from this region by activating different intracellular pathways. Substance P-induced contraction is 1,4,5-inositol trisphosphate (IP3)/calmodulin dependent, while contraction induced by bombesin is mediated by a protein kinase C (PKC)-dependent pathway. The sustained contraction induced by bombesin or exogenous PKC was blocked by preincubation of cells with monoclonal antibodies to hsp27, while the transient contraction induced by substance P or IP3was unaffected by the antibodies. Preincubation with isotype matched control antibodies had no inhibitory effect on contraction induced in response to the agents used. These data support a novel role for hsp27 in the non calmodulin mediated sustained contraction induced by bombesin or PKC.
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