Connexin45 gap junction channels in rat cerebral vascular smooth muscle cells.

Connexin45 gap junction channels in rat cerebral vascular smooth muscle cells.
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大鼠脑血管平滑肌细胞中的Connexin45间隙连接通道。

DOI:
10.1152/ajpheart.2001.281.5.h1890
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发表时间:
2001
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
--
通讯作者:
Simard,JM
Simard,JM
中科院分区:
--
文献类型:
--
作者:
Li,X;Simard,JM

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血管壁中的细胞表达连接蛋白(Cx)43、Cx40和Cx 37。最近,我们的特点在大鼠基底动脉平滑肌细胞的间隙连接通道,并发现功能不仅归因于这三个连接蛋白,但也到一个身份不明的连接蛋白,包括强电压依赖性和30-40 pS的单通道电导。在这里,我们报告的数据与Cx45的鉴定一致。使用抗人Cx45和抗小鼠Cx45抗体的免疫荧光显示α-肌动蛋白阳性细胞之间的标记,并且来自内皮破坏后的动脉的mRNA的RT-PCR产生与小鼠Cx45和人Cx45具有90-98%同一性的扩增子。暴露于干扰Cx43、Cx40或Cx45对接的寡肽后进行双穿孔膜片钳。用Cx43和Cx40的阻断肽预处理的细胞对表现出强烈的电压依赖性跨接电导[电压依赖性电导下降一半时的电压(V1/2)= ±18.9 mV]和小的单通道电导(31 pS),与Cx45的存在一致,而用Cx45阻断肽预处理的细胞对表现出较弱的电压依赖性电导(V1/2= ±37.9 mV),与Cx45的阻断一致。我们的数据表明,Cx45的转录,表达,并形成功能的缝隙连接通道在大鼠脑动脉平滑肌。
Cells in blood vessel walls express connexin (Cx)43, Cx40, and Cx37. We recently characterized gap junction channels in rat basilar artery smooth muscle cells and found features attributable not only to these three connexins but also to an unidentified connexin, including strong voltage dependence and single channel conductance of 30–40 pS. Here, we report data consistent with identification of Cx45. Immunofluorescence using anti-human Cx45 and anti-mouse Cx45 antibodies revealed labeling between α-actin-positive cells, and RT-PCR of mRNA from arteries after endothelial destruction yielded amplicons exhibiting 90–98% identity with mouse Cx45 and human Cx45. Dual-perforated patch clamping was performed after exposure to oligopeptides that interfere with docking of Cx43, Cx40, or Cx45. Cell pairs pretreated with blocking peptides for Cx43 and Cx40 exhibited strongly voltage-dependent transjunctional conductances [voltage at which voltage-dependent conductance declines by one-half (V1/2) = ±18.9 mV] and small single channel conductances (31 pS), consistent with the presence of Cx45, whereas cell pairs pretreated with blocking peptide for Cx45 exhibit weaker voltage-dependent conductances (V1/2= ±37.9 mV), consistent with block of Cx45. Our data suggest that Cx45 is transcribed, expressed, and forms functional gap junction channels in rat cerebral arterial smooth muscle.
Connexin45 表达优先与小鼠和大鼠心脏的心室传导系统相关。
DOI: --
发表时间: 1998
影响因子: 20.1
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发表时间: 1995-02-01
影响因子: 4.8
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发表时间: 1989-03
期刊: The American journal of physiology
影响因子: --
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通讯作者: S. Segal;B. Duling
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影响因子: 3.3
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间隙连接蛋白 connexin45 的表征。
DOI: 10.1007/bf00232672
发表时间: 1994
期刊: The Journal of membrane biology
影响因子: --
作者:
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通讯作者: Beyer,EC