Document Detail


Synthesis of prostaglandins I2 and E2 by the canine gallbladder in vitro: studies using a new incubation chamber.
MedLine Citation:
PMID:  2107956     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Using a specially designed incubation chamber, differential synthesis and the response to added arachidonic acid (25 mM) and L-alpha-phosphatidylcholine (LAP; 2 mM) was quantified in gallbladders from male and female dogs. Prostaglandin I2 (PGI2) was the predominant prostanoid synthesized, and tissues from females produced much more PGI2 under basal conditions than did gallbladders harvested from male dogs. Addition of arachidonic acid stimulated PGI2 synthesis by almost 100 per cent. Arachidonate-stimulated mucosal and serosal production of PGI2 were (mean(s.e.m.] comparable, 343(178) and 375(89) pg/cm2/min, respectively. Gallbladders from female animals synthesized significantly more PGI2 than did tissue from males. Indomethacin inhibited PGI2 synthesis in a dose-response manner; at 7 x 10(-5) M, prostanoid synthesis was inhibited by greater than 80 per cent. Arachidonic acid did not stimulate prostaglandin E2 (PGE2) production by gallbladder tissue. LAP similarly stimulated PGI2 biosynthesis, but in contrast to the effect of arachidonic acid, the effect was significantly greater in the serosa than the mucosa, 355(107) and 213(59) pg/cm2/min, respectively. LAP also stimulated PGE2 biosynthesis by the canine gallbladder in a pattern very similar to that of PGI2. Based on the differences in response to the two agents added, we conclude that arachidonic acid and L-alpha-phosphatidylcholine stimulate prostaglandin biosynthesis via independent pathways. We advocate the use of the incubation chamber for the assessment of prostanoid biosynthesis by the gallbladder in vitro.
Authors:
D W England; B M Jaffe; H Webb; E L Hoover
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Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The British journal of surgery     Volume:  77     ISSN:  0007-1323     ISO Abbreviation:  Br J Surg     Publication Date:  1990 Feb 
Date Detail:
Created Date:  1990-05-03     Completed Date:  1990-05-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372553     Medline TA:  Br J Surg     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  173-8     Citation Subset:  AIM; IM    
Affiliation:
Department of Surgery, Brooklyn V.A. Medical Center, New York.
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MeSH Terms
Descriptor/Qualifier:
Animals
Arachidonic Acid
Arachidonic Acids / metabolism,  pharmacology
Depression, Chemical
Dinoprostone / biosynthesis*
Dogs
Epoprostenol / biosynthesis*
Female
Gallbladder / drug effects,  metabolism*
Incubators
Indomethacin / pharmacology
Male
Mucous Membrane / metabolism
Phosphatidylcholines / pharmacology
Serous Membrane / metabolism
Sex Factors
Stimulation, Chemical
Chemical
Reg. No./Substance:
0/Arachidonic Acids; 0/Phosphatidylcholines; 35121-78-9/Epoprostenol; 363-24-6/Dinoprostone; 506-32-1/Arachidonic Acid; 53-86-1/Indomethacin

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


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