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  • Articles: DFG German National Licenses  (3)
  • 1990-1994  (3)
  • 1985-1989
  • 1993  (1)
  • 1991  (1)
  • 1990  (1)
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  • Articles: DFG German National Licenses  (3)
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Years
  • 1990-1994  (3)
  • 1985-1989
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  • 1
    ISSN: 1573-2568
    Keywords: bile ; pancreatic secretion ; CCK
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Pancreatic exocrine secretion in conscious rats is regulated by intraluminal bile and/or pancreatic juice. Exclusion of bile and/or pancreatic juice from the intestinal lumen caused cholecystokinin (CCK) release and stimulated pancreatic secretion. CCK in the plasma is mainly derived from endocrine cells in the proximal small intestinal mucosa. We examined the changes in CCK concentrations in the intestinal mucosa and compared them to those of plasma CCK concentrations and the changes of luminal trypsin activities after bile and/or pancreatic juice diversion in conscious rats. Rats with bile and pancreatic fistulae were used. Each treatment of bile, pancreatic juice, and bile-pancreatic juice diversion decreased luminal trypsin activity and increased plasma and intestinal CCK concentrations. The potency of the stimulatory effect on plasma and intestinal CCK concentrations was bilepancreatic juice diversion〉pancreatic juice diversion≧bile diversion. Neither plasma CCK concentration nor intestinal CCK concentration was in inverse proportion to trypsin activity. The plasma CCK concentration did not parallel intestinal CCK concentration. Intravenous infusion of CCK-8 (300 pmol/kg/hr) did not increase CCK concentration in the intestinal mucosa. It was proposed that bile and/or pancreatic juice in the intestinal lumen regulated CCK concentrations not only in the plasma but also in the intestinal mucosa.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Digestive diseases and sciences 35 (1990), S. 55-60 
    ISSN: 1573-2568
    Keywords: cholecystokinin release ; bile diversion ; taurocholate ; pancreatic exocrine function
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of intraluminal bile on cholecystokinin release and pancreatic exocrine secretion were studied in conscious rats. Since it has been suggested that bile acid may influence pancreatic secretion indirectly by interacting with luminal protease activities, intraduodenal protease activities were eliminated by pancreatic juice diversion accompanied with simultaneous intraduodenal infusion of aprotinin. This treatment resulted in gradual increases in pancreatic juice flow, bicarbonate and protein outputs, and an increase in plasma cholecystokinin levels, reaching plateau levels 2 hr after the start of the treatment. When endogenous bile was excluded from the intestine, the pancreatic secretion and plasma cholecystokinin concentrations further increased. The intraduodenal infusion of sodium taurocholate during bile pancreatic juice diversion inhibited cholecystokinin release, while pancreatic protein output was only transiently decreased. The results indicate that bile in the duodenum directly regulates cholecystokinin release, probably through its major components, bile salts.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-2568
    Keywords: cholecystokinin ; bioassay ; bile acid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A bioassay using dispersed pancreatic acini was used to measure fasting plasma cholecystokinin (CCK) concentrations in 105 patients with various kinds of gastrointestinal diseases, 17 patients with diabetes mellitus, and 6 healthy voluntters. High plasma CCK bioactivities were observed in patients with obstructive jaundice, choledocolithiasis, and primary biliary cirrhosis. Twenty-three samples with high CCK bioactivities were assayed by the same bioassay after the addition of a specific CCK antagonist and by a CCK radioimmunoassay in order to determine whether the high CCK-like bioactivity was due to circulating CCK or other factors. High CCK bioactivities were partially inhibited by the specific CCK antagonist, CR-1409, but the activities were not totally abolished. The residual bioactivities (not inhibited by CR-1409) correlated with plasma bile acid concentrations. The inhibitable CCK bioactivities correlated with plasma CCK levels obtained by radioimmunoassay. Although the bioassay using dispersed pancreatic acini has several advantages for measuring plasma CCK, this method overestimates CCK bioactivities in patients with high plasma bile acid concentrations.
    Type of Medium: Electronic Resource
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