Ionic Conductances in Dissociated Smooth Muscle Cells

Ionic Conductances in Dissociated Smooth Muscle Cells
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离解平滑肌细胞中的离子电导

DOI:
10.3181/00379727-197-43234
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发表时间:
1991
影响因子:
--
通讯作者:
B. S. Wong
B. S. Wong
中科院分区:
--
文献类型:
--
作者:
B. S. Wong

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结论胃肠平滑肌细胞和血管平滑肌细胞膜上存在相似的离子通道,但某些离子通道的调节方式不同。然而,这并不奇怪,因为它们以不同的方式对自主神经递质(如乙酰胆碱和去甲肾上腺素)产生生理反应。平滑肌收缩剂,血管肌肉中的去甲肾上腺素和胃肠肌肉中的乙酰胆碱,似乎具有激活Ca 2+通道的共同特性。然而,这些药物是否直接或通过第二信使系统影响Ca2+通道仍有待确定。另一方面,血管扩张剂似乎通过激活K+通道,特别是ATP敏感的K+通道起作用。目前,去甲肾上腺素降低胃肠平滑肌细胞运动性的离子机制仍不清楚。因此,在过去的几年中,利用膜片钳技术已经收集了大量关于存在于各种类型的解离平滑肌细胞中的离子通道的信息。然而,许多重要的问题仍然没有答案,毫无疑问,在可预见的未来,这将是一个富有成果的研究领域。未来需要解决的另一个挑战是应用从这些分离细胞中学到的知识来解释在完整组织中观察到的结果。
Conclusion Gastrointestinal and vascular smooth muscle cells appear to possess similar ion channels in their membranes but differ in how some of these channels are modulated. This, however, is not surprising since they react in a different manner physiologically to autonomic neurotransmitters such as acetylcholine and norepinephrine. Smooth muscle constrictors, norepinephrine in the case of vascular muscle, and acetylcholine in the case of gastrointestinal muscle, appear to share the common property of activating Ca2+ channels. However, whether these agents affect the Ca2+ channels directly or through second messenger systems remain to be determined. Vasodilators, on the other hand, appear to work via activation of K+ channels, specifically, the ATP-sensitive K+ channel. The ionic mechanism responsible for norepinephrine's decrease in the motility of gastrointestinal smooth muscle cells remains unknown at the present time. Thus, a wealth of information has been gathered within the past several years concerning the ionic channels that are present in various types of dissociated smooth muscle cells utilizing the patch-clamp technique. However, a lot of important questions still remain unanswered and will no doubt be an area of fruitful research for the foreseeable future. Another challenge that needs to be addressed in the future would be to apply the knowledge learned from these isolated cells to account for the observations seen in intact tissue.
新鲜分离的平滑肌细胞中大电导 Ca2 激活的 K 通道。
DOI: 10.3109/09687688609065445
发表时间: 1986
期刊: Membrane biochemistry
影响因子: --
作者:
Singer,JJ;WalshJr,JV
通讯作者: WalshJr,JV
DOI: 10.1126/science.2471269
发表时间: 1989-06-09
期刊: SCIENCE
影响因子: 56.9
作者:
ORDWAY, RW;WALSH, JV;SINGER, JJ
通讯作者: SINGER, JJ
DOI: 10.1016/0076-6879(82)85027-1
发表时间: 1982
影响因子: --
作者:
Fay,FS;Hoffmann,R;Leclair,S;Merriam,P
通讯作者: Merriam,P
单个新鲜分离的平滑肌细胞膜的被动特性。
DOI: 10.1152/ajpcell.1980.239.5.c153
发表时间: 1980
期刊: The American journal of physiology
影响因子: --
作者:
Singer,JJ;WalshJr,JV
通讯作者: WalshJr,JV
DOI: 10.1126/science.2425434
发表时间: 1986
期刊: Science (New York, N.Y.)
影响因子: --
作者:
Sturek,M;Hermsmeyer,K
通讯作者: Hermsmeyer,K