Usage Information
Citation Information: J Clin Invest. 1991;88(2):423-429. https://doi.org/10.1172/JCI115321.
Abstract
The regulation of osmotic water permeability (Pf) by vasopressin (VP) in kidney collecting tubule involves the exocytic-endocytic trafficking of vesicles containing water channels between an intracellular compartment and apical plasma membrane. To examine effects of transcellular water flow on vesicle movement, Pf was measured with 1-s time resolution in the isolated perfused rabbit cortical collecting tubule in response to addition and removal of VP (250 microU/ml) in the presence of bath greater than lumen (B greater than L), lumen greater than bath (L greater than B), and lumen = bath (L = B) osmolalities. With VP addition, Pf increased from 12 to 240-270 x 10(-4) cm/s (37 degrees C) in 10 min. At 1 min, Pf was approximately 70 x 10(-4) cm/s for B greater than L, L greater than B, and L = B conditions. At later times, Pf increased fastest for L greater than B and slowest for B greater than L osmolalities; at 5 min, Pf was 250 x 10(-4) cm/s (L greater than B) and 158 x 10(-4) cm/s (B greater than L). With VP removal, Pf returned to pre-VP levels at the fastest rate for B greater than L and the slowest rate for L greater than B osmolalities; at 30 min, Pf was 65 x 10(-4) cm/s (B greater than L) and 183 x 10(-4) cm/s (L greater than B). For a series of osmotic gradients of different magnitudes and directions, the rates of Pf increase and decrease were dependent upon the magnitude of transcellular volume flow; control studies showed that paracellular water flux, asymmetric transcellular water pathways, or changes in cell volume could not account for the data. VP-dependent endocytosis was measured by apical uptake of rhodamine-dextran; in paired studies where the same tubule was used for + and - gradients, B greater than L and L greater than B osmolalities gave 168% and 82% of uptake measured with no gradient. In contrast, endocytosis in proximal tubule was not dependent on gradient direction. These data provide evidence that transcellular volume flow modulates the vasopressin-dependent cycling of vesicles containing water channels, suggesting a novel driving mechanism to aid or oppose the targeted, hormonally directed movement of subcellular membranes.
Authors
M Kuwahara, L B Shi, F Marumo, A S Verkman
Usage data is cumulative from May 2024 through May 2025.
| Usage | JCI | PMC |
|---|---|---|
| Text version | 91 | 3 |
| 43 | 11 | |
| Scanned page | 261 | 4 |
| Citation downloads | 52 | 0 |
| Totals | 447 | 18 |
| Total Views | 465 | |
Usage information is collected from two different sources: this site (JCI) and Pubmed Central (PMC). JCI information (compiled daily) shows human readership based on methods we employ to screen out robotic usage. PMC information (aggregated monthly) is also similarly screened of robotic usage.
Various methods are used to distinguish robotic usage. For example, Google automatically scans articles to add to its search index and identifies itself as robotic; other services might not clearly identify themselves as robotic, or they are new or unknown as robotic. Because this activity can be misinterpreted as human readership, data may be re-processed periodically to reflect an improved understanding of robotic activity. Because of these factors, readers should consider usage information illustrative but subject to change.
Copyright © 2025 American Society for Clinical Investigation
ISSN: 0021-9738 (print), 1558-8238 (online)