Cytoplasmic involvement in ADH-mediated osmosis across toad urinary bladder.

Cytoplasmic involvement in ADH-mediated osmosis across toad urinary bladder.
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细胞质参与 ADH 介导的蟾蜍膀胱渗透作用。

DOI:
10.1152/ajpcell.1983.245.5.c297
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发表时间:
1983
期刊:
The American journal of physiology
影响因子:
--
通讯作者:
DiBona,DR
DiBona,DR
中科院分区:
--
文献类型:
--
作者:
DiBona,DR

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多项研究表明,抗利尿激素(ADH)可能对蟾蜍膀胱中颗粒上皮细胞的细胞骨架组织有直接影响。在某种程度上,这些作用与 ADH 对粘膜质膜水力渗透性的既定作用是一致的,但似乎其他构象调整(主要是细胞质的)可能具有相当的重要性。这篇综述的主旨是激素引起颗粒细胞的总体重组,从而使上皮作为一个整体可以作为渗透途径有效地发挥作用。细胞骨架变化的细节尚不清楚,但对这些特殊效应的干扰或调节表明,细胞质组织是渗透流速反馈控制的场所,是细胞质剧烈稀释情况下活力的基础,也是观察到的渗透和扩散通透系数差异的主要因素。为了激发该领域的新思想和实验,一些初步发现被自由引用。
Several lines of investigation have suggested that antidiuretic hormone (ADH) may have direct effects on the cytoskeletal organization of granular epithelial cells in the toad urinary bladder. To some extent, these effects are in concert with the well-established action of ADH on the hydraulic permeability of the mucosal plasma membrane, but it appears that other conformational adjustments (largely cytoplasmic) may be of comparable importance. The thrust of this review is that the hormone brings about a general restructuring of the granular cells so that the epithelium as a whole may function efficiently as an osmotic pathway. Details of cytoskeletal changes are far from clear as yet, but interference with or modulation of these particular effects infer that cytoplasmic organization is the seat of feedback control of osmotic flow rate, the basis for viability in the presence of dramatic cytosolic dilution and a major factor in the observed disparity in osmotic and diffusional permeability coefficients. In the interest of stimulating new thoughts and experiments in this area, a number of preliminary findings have been freely cited.
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