Document Detail

Decreased pancreatic exocrine response to cholecystokinin in Zucker obese rats.
MedLine Citation:
PMID:  6178298     Owner:  NLM     Status:  MEDLINE    
Cholecystokinin (CCK), one of the peptides secreted by the gastrointestinal tract during a meal, stimulates release of enzymes into pancreatic juice and is a trophic hormone for the pancreas. Administration of CCK also decreases food intake, and obese rats have been shown to have a higher threshold than lean rats for this apparent effect on satiety. In this study experiments were designed to compare the sensitivity of obese and lean rats to the effects of CCK octapeptide (CCK-8) on pancreatic structure and exocrine function. In both growing and adult Zucker rats DNA content of the pancreas from obese rats was decreased compared with that from lean rats [2.42 +/- 0.21 vs. 3.07 +/- 0.18 mg (P less than 0.01) and 2.46 +/- 0.25 vs. 3.01 +/- 0.19 mg (P less than 0.05), respectively], and in adult obese rats this was accompanied by decreased pancreas size on both absolute weight and percent of body weight bases. In adult obese Bar Harbor mice, although DNA content of the pancreas was also decreased [1.70 +/- 0.10 vs. 2.41 +/- 0.11 mg (P less than 0.01)], pancreas weight was not different (0.30 +/- 0.01 vs. 0.32 +/- 0.01 g). In young rats growth of the pancreas was stimulated by 2 micrograms/kg CCK-8 administered subcutaneously or 100 mg/kg of a trypsin inhibitor administered orally twice daily for 2 wk. Although both treatments increased weight and DNA and protein content of the pancreas, the increases in DNA and protein content were smaller in obese than lean rats, indicating a decreased responsiveness to both trophic agents. Administration of CCK-8 stimulated smaller increases in pancreatic juice volume and amylase release in obese compared with lean rats, indicating decreased pancreatic exocrine function in response to CCK. In adults the CCK-8 dose-response curve for amylase release from dispersed pancreatic acini of obese rats was similar to that of lean rats, indicating normal sensitivity in vitro. Thus, in obese rats and mice DNA content of the pancreas is decreased when compared with that of lean rats and mice, and this is accompanied by decreased in vivo responses to CCK in obese rats.
C L McLaughlin; S R Peikin; C A Baile
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  242     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1982 Jun 
Date Detail:
Created Date:  1982-08-26     Completed Date:  1982-08-26     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  G612-9     Citation Subset:  IM    
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MeSH Terms
Body Weight
Cholecystokinin / pharmacology*
DNA / analysis
Eating / drug effects
Obesity / metabolism*
Organ Size
Pancreas / analysis,  drug effects*
Proteins / analysis
RNA / analysis
Rats, Zucker
Trypsin Inhibitors / pharmacology
Grant Support
Reg. No./Substance:
0/Proteins; 0/Trypsin Inhibitors; 63231-63-0/RNA; 9007-49-2/DNA; 9011-97-6/Cholecystokinin

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