Document Detail


Filtration coefficient and osmotic reflection coefficient to albumin in rabbit submandibular gland capillaries.
MedLine Citation:
PMID:  3392669     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
1. The isolated perfused submandibular salivary gland of the rabbit has been used in order to make estimates of the filtration coefficient (Kf) and reflection coefficient (sigma d) of the capillary wall to albumin. 2. An isogravimetric preparation was used and in paired experiments the value for Kf obtained in glands perfused with albumin-Krebs solution, 0.96 +/- 0.086 (mean +/- S.E. of mean) ml min-1 mmHg-1 100 g-1, was not significantly different from that in blood-perfused glands, 0.90 +/- 0.15. 3. On analysing the data for reflection coefficient, it was concluded that the above values underestimated Kf by about 30%; using corrected values for Kf, osmotic reflection coefficients were determined from the weight changes following a sudden change in the oncotic pressure of the perfusate. The value for sigma d to albumin lay between 0.79 and 1.0, the lower value being obtained after the Kf correction. 4. The high hydraulic conductivity, combined with sieving properties comparable to those in continuous capillaries, is consistent with other data on fenestrated capillaries. 5. Finally, it was observed that, while the Kf value calculated from the initial flux rate was similar whether measured during fluid efflux from or influx into the microvasculature, on returning to the initial conditions after raising osmotic pressure, efflux was now more rapid than influx. This phenomenon is discussed in relation to readjustment of Starling forces and the possible existence of an asymmetric double membrane in the capillary, interstitium system and cells of the salivary gland.
Authors:
J Gamble; L H Smaje; P D Spencer
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of physiology     Volume:  398     ISSN:  0022-3751     ISO Abbreviation:  J. Physiol. (Lond.)     Publication Date:  1988 Apr 
Date Detail:
Created Date:  1988-08-24     Completed Date:  1988-08-24     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  0266262     Medline TA:  J Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  15-32     Citation Subset:  IM    
Affiliation:
Department of Physiology, Charing Cross and Westminster Medical School, London.
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MeSH Terms
Descriptor/Qualifier:
Albumins / pharmacokinetics*
Animals
Capillary Permeability*
Filtration
Male
Osmosis
Perfusion
Rabbits
Submandibular Gland / blood supply*
Chemical
Reg. No./Substance:
0/Albumins
Comments/Corrections

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


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