三联体的研究。II. 示踪剂渗入连接间隙。
Studies of the triad. II. Penetration of tracers into the junctional gap.
作者信息
Franzini-Armstrong C
出版信息
J Cell Biol. 1971 Apr;49(1):196-203. doi: 10.1083/jcb.49.1.196.
Abstract
Ferritin and Imferon molecules were introduced as tracers inside "skinned" muscle fibers to test which part of the triadic junction gap is freely exchangeable with the sarcoplasm. At least 50% of the T-system surface is freely accessible from the sarcoplasm. Of the remainder, 30% of the total T-system surface is covered by the junctional feet, and 20% in the center of the junction may or may not be accessible. The possibility is discussed that the triadic junction may not function as an electrical coupling.
摘要
将铁蛋白和去铁胺分子作为示踪剂引入“去皮”肌纤维内，以测试三联体连接间隙的哪一部分可与肌浆自由交换。至少50%的横管系统表面可从肌浆自由进入。其余部分中，横管系统总表面的30%被连接足覆盖，连接中心的20%可能可进入，也可能不可进入。文中讨论了三联体连接可能不具有电偶联功能的可能性。
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