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Very low osmotic water permeability and membrane fluidity in isolated toad bladder granules

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Summary

Osmotic water permeability of the apical membrane of toad urinary epithelium is increased greatly by vasopressin (VP) and is associated with exocytic addition of granules and aggrephores at the apical surface. To determine the physiological role of granule exocytosis, we measured the osmotic water permeability and membrane fluidity of isolated granules, surface membranes and microsomes prepared from toad bladder in the presence and absence of VP.P f was measured by stopped-flow light scattering and membrane fluidity was examined by diphenylhexatriene (DPH) fluorescence anisotropy. In response to a 75mm inward sucrose gradient, granule size decreased with a single exponential time constant of 2.3±0.1 sec (sem, seven preparations, 23°C), corresponding to aP f of 5×10−4 cm/sec; the activation energy (E a ) forP f was 17.6±0.8 kcal/mole. Under the same conditions, the volume of surface membrane vesicles decreased biexponentially with time constants of 0.13 and 1.9 sec; the fast component comprised ≈ 70% of the signal. Granule, surface membrane and microsome time constants were unaffected by VP. However, in surface membranes, there was a small decrease (6±2%) in the fraction of surface membranes with fast time constant. DPH anisotropies were 0.253 (granules), 0.224 (surface membrane fluidity is remarkably lower than that of surface and microsomal membranes, and (4) rapid water transport occurs in surface membrane vesicles. The unique physical properties of the granule suggests that apical exocytic addition of granule membrane may be responsible for the low water permeability of the unstimulated apical membrane.

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Authors and Affiliations

  1. Cardiovascular Research Institute, University of California, 94143, San Francisco, California

    A. S. Verkman & Sandra K. Masur

  2. Department of Physiology and Biophysics, Mount Sinai School of Medicine, 10029, New York, New York

    A. S. Verkman & Sandra K. Masur

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  1. A. S. Verkman
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  2. Sandra K. Masur
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Verkman, A.S., Masur, S.K. Very low osmotic water permeability and membrane fluidity in isolated toad bladder granules. J. Membrain Biol. 104, 241–251 (1988). https://doi.org/10.1007/BF01872326

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