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Cholecystokinin constricts the canine cystic duct
Gastroenterology
|November 1, 1983
Summary
Cholecystokinin increases resistance in the canine cystic duct and gallbladder pressure dose-dependently. The cystic duct shows lower sensitivity to cholecystokinin compared to the gallbladder.
Area of Science:
- Gastroenterology
- Physiology
Background:
- Cholecystokinin (CCK) is a key hormone regulating digestive functions.
- Its effects on the cystic duct, a critical component of bile flow, require detailed investigation.
Purpose of the Study:
- To investigate the in vivo and in vitro effects of cholecystokinin (CCK) and cholecystokinin-octapeptide (CCK-8) on canine cystic duct resistance and contractility.
- To compare the sensitivity of the cystic duct to CCK/CCK-8 with that of the gallbladder.
Main Methods:
- In vivo assessment of cystic duct resistance to flow in dogs using saline perfusion.
- Measurement of gallbladder intraluminal pressure in response to CCK.
- In vitro studies on isolated canine cystic duct and gallbladder muscle strips to assess contractile responses to CCK and CCK-8.
Main Results:
- CCK dose-dependently increased resistance to flow through the canine cystic duct in vivo.
- CCK also elevated gallbladder intraluminal pressure in a dose-dependent manner.
- Both in vivo and in vitro studies revealed significantly lower sensitivity of the cystic duct compared to the gallbladder to the contractile effects of CCK and CCK-8.
Conclusions:
- Cholecystokinin significantly impacts cystic duct resistance and gallbladder pressure.
- The cystic duct exhibits a diminished sensitivity to CCK/CCK-8 compared to the gallbladder.
- Further research is needed to determine if CCK affects cystic duct resistance under physiological conditions.
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