… Ultrastructural analysis of cell-cell adhesion using electron microscopy has revealed that there are special structures or cell membrane parts involved in cell adhesion. These include desmosomes, tight junctions, zonula adherens (or intermediate junctions), and gap junctions. In epithelial cells, tight junctions, zonula adherens, and desmosomes are often arranged in sequence from the free surface of the epithelium toward the inside, forming a structure called a junctional complex. … From [Epithelium]…In addition to the occluded zone, there are patchy structures called desmosomes scattered between epithelial cells, which connect the cells together. There are also patchy structures called gap junctions, where the two cells are extremely close to each other, with specific protein particles between them, and a small hole in the center of this particle that connects the two cells, allowing ions to be exchanged between the cells. On the basal side of epithelial cells, there is a basement membrane (basement lamina) under the cell membrane, which lines the epithelium. … *Some of the terminology that mentions "gap junction" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 細胞間接着を電子顕微鏡を用いて微細構造レベルで解析した結果,細胞接着のための特別な構造,または細胞膜の部分のあることが知られている。接着斑(デスモソームdesmosome),密着結合tight junction,接着帯zonula adherens(または中間結合),狭間隙(きようかんげき)結合gap junction(ギャップ結合)などがそれである。上皮細胞ではしばしば,密着結合,接着帯,接着斑が上皮の自由表面から内側に向かって順に並び,結合複合体と呼ばれる構造を形成する。… 【上皮】より…閉鎖帯のほかに上皮細胞間にはデスモソームdesmosomeという斑状の構造が散在しあって細胞間を接着している。またギャップ結合gap junctionとよばれる構造が斑状にちらばり,ここでは両細胞の細胞間がいちじるしく接近し,その間に特有のタンパク質粒子が介在し,この粒子の中央に両細胞をつなぐ小孔があり,細胞間のイオンの交流を行っている。上皮細胞の基底側には細胞膜の下に基底膜(基底板)があり上皮を裏打ちしている。… ※「gap junction」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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