Specific localization of gap junction protein, connexin45, in the deep muscular plexus of dog and rat small intestine

Specific localization of gap junction protein, connexin45, in the deep muscular plexus of dog and rat small intestine
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间隙连接蛋白 connexin45 在狗和大鼠小肠深肌丛中的特异性定位

DOI:
--
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发表时间:
1998
影响因子:
3.6
通讯作者:
Y. Shibata
Y. Shibata
中科院分区:
生物学3区
文献类型:
--
作者:
K.;A. Kuraoka;M. Kawabuchi;Y. Shibata

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摘要肠道运动中起搏器活动的细胞网络仍然是一个有争议的问题。 由于在肠壁的间隙连接细胞间通讯可能提供重要的线索,了解肠道运动的调节机制,我们试图澄清三种类型的间隙连接蛋白的分布模式。使用连接蛋白40,连接蛋白43,连接蛋白45,平滑肌肌动蛋白和波形蛋白的抗体,免疫细胞化学观察与共聚焦激光扫描显微镜新鲜冷冻小肠和结肠的狗和大鼠。连接蛋白45定位于沿着深肌丛的小肠在狗和大鼠。双标记研究显示,连接蛋白45与波形蛋白重叠,但不与肌动蛋白阳性区域重叠,表明细胞的成纤维细胞样性质,而不是平滑肌样。缝隙连接蛋白43免疫反应性出现沿着平滑肌细胞表面的外环层的两个动物的小肠。连接蛋白40免疫反应性未观察到在肌肉层以外的大血管壁。有人建议,连接蛋白45表达细胞沿着深肌丛的狗和大鼠小肠可能作为一个组成部分的起搏器系统,其中可能包括一个导电系统,通过形成一个细胞网络,通过特定类型的间隙连接。
Abstract Cellular networks of pacemaker activity in intestinal movements are still a matter of debate. Because gap-junctional intercellular communication in the intestinal wall may provide important clues for understanding regulatory mechanisms of intestinal movements, we have attempted to clarify the distribution patterns of three types of gap junction proteins. Using antibodies for connexin40, connexin43, connexin45, smooth muscle actin, and vimentin, immunocytochemical observations were made with the confocal laser scanning microscope on cryosections of fresh-frozen small intestine and colon of the dog and rat. Connexin 45 was localized along the deep muscular plexus of the small intestine in both dog and rat. Double labeling studies revealed that connexin45 overlapped with vimentin –, but not actin-positive areas, indicating the fibroblast-like nature of the cells, rather than their being smooth muscle-like. Connexin43 immunoreactivity appeared along the smooth muscle cell surface in the outer circular layer of the small intestine of both animals. Connexin 40 immunoreactivity was not observed in the muscle layer other than in the wall of large blood vessels. It is suggested that connexin45-expressing cells along the deep muscular plexus of dog and rat small intestine are likely to act as a constituent of a pacemaker system, which may include a conductive system, by forming a cellular network operating via specific types of gap junctions.
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