THE ENDOPLASMIC RETICULUM OF GASTRIC PARIETAL CELLS.

S Ito
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引用次数: 135

Abstract

An electron microscopic survey has been made of the gastric parietal or oxyntic cell of the human, cat, beaver, dog, hamster, rat, mouse, and bat, and of the corresponding cell type in two species of frog, two species of toad, and the horned lizard. A feature consistently found in the parietal cells of the mammals or their equivalent in the lower vertebrates is the agranular endoplasmic reticulum, which takes the form of branching and anastomosing small tubules approximately 200 to 500 A in diameter, sometimes expanded into flattened cisternae. In mammalian parietal cells this form of the endoplasmic reticulum is found only in limited amounts, but in the corresponding secretory cells of the amphibia and reptilia the tubular agranular reticulum is abundant. It is believed to comprise a more or less continuous system of channels, but owing to their tortuous course only short profiles are seen in thin sections. Immediately subjacent to the plasmalemma at the free surface, the cytoplasm is relatively free of organelles but is occasionally traversed by the agranular reticulum, which appears to be continuous at some points with the cell surface. The possible participation of the agranular endoplasmic reticulum in hydrochloric acid secretion is discussed.

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胃壁细胞的内质网。
用电子显微镜观察了人类、猫、海狸、狗、仓鼠、大鼠、小鼠和蝙蝠的胃壁细胞或氧合细胞,以及两种青蛙、两种蟾蜍和角蜥的相应细胞类型。在哺乳动物或低等脊椎动物的壁细胞中经常发现的一个特征是颗粒状内质网,其形式为分枝和吻合的小管,直径约为200至500 A,有时扩展成扁平的池。在哺乳动物的壁细胞中,这种形式的内质网数量有限,但在两栖动物和爬行动物的相应分泌细胞中,管状颗粒网数量丰富。据信,它由一个或多或少连续的水道系统组成,但由于其曲折的过程,在薄剖面中只能看到短剖面。在自由表面,紧挨着质膜的细胞质相对没有细胞器,但偶尔会被颗粒网穿过,颗粒网在细胞表面的某些点上似乎是连续的。讨论了颗粒内质网参与盐酸分泌的可能性。
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