Document Detail

Applied pressures and net water flux across in vitro frog gastric mucosa.
MedLine Citation:
PMID:  308777     Owner:  NLM     Status:  MEDLINE    
The effects of hydrostatic pressure differences up to 0.4 atm/413 cmH2O were studied on frog gastric mucosa in vitro. Net water flux, transmucosal electrical potential difference, and acid secretion were measured. A significant correlation between hydrostatistic pressure difference and net water flow (r=0.77) was obtained. The intercept of the regression line, at zero hydrostatic pressure difference, is 9.3 +/- 0.5 microliter/cm2.h, and the slope 42.9 +/- 3.2 microliter/cm2.atm.h. No significant correlation was obtained between the hydrostatic pressure difference and the transmucosal potential difference (P greater than 0.20), the acid secretion (P greater than 0.20), or the nonacidic chloride transport, measured as short-circuit current (P greater than 0.20). Hydrostatic water flux is compared to osmotically induced flux previously reported. It is proposed that the difference between hydrostatic and osmotic induced water fluxes is due to the area of cells exposed to the pressures. Only part of surface cells are directly exposed to the osmotic pressure due to the presence of restricted extracellular compartments.
L Villegas
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Publication Detail:
Type:  In Vitro; Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  235     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1978 Oct 
Date Detail:
Created Date:  1978-11-29     Completed Date:  1978-11-29     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E361-5     Citation Subset:  IM    
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MeSH Terms
Biological Transport
Cell Membrane Permeability
Gastric Juice / secretion
Gastric Mucosa / physiology*
Hydrostatic Pressure
Rana pipiens
Water / metabolism*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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