Effect of peripherally and centrally administered calcitonin on gallbladder emptying in dogs.
The effect of calcitonin on meal-stimulated gallbladder emptying (GBE) was examined after intravenous (i.v.) and intracerebroventricular (i.c.v.) administration in six mongrel dogs. The gallbladder contraction was surveyed by means of real-time ultrasonography in conscious dogs. Calcitonin given i.v. elicited an immediate and strong inhibition of postprandial GBE-the integrated 0- to 120-min gallbladder response was 118.1 +/- 8.0%.h after placebo, whereas it was 91.8 +/- 2.1%.h, 59.4 +/- 17.9%.h (P < 0.001), and 14.2 +/- 20.5%.h (P < 0.001) after 3.6, 18.0, and 90.0 pmol.kg-1 calcitonin, respectively. After i.c.v. administration (1.8 and 18.0 pmol.kg-1), only the higher calcitonin dose exerted a moderate inhibitory effect on postprandial GBE. The calcitonin doses required to evoke a 50% inhibition of meal-stimulated GBE were 15- to 10-fold lower after i.v. than i.c.v. application. Peripherally given calcitonin brought about a dose-dependent increase in the interdigestive gallbladder volume-the linear regression of the relative gallbladder volume versus calcitonin dose was y = 11.60 [ln(dose + 1)] + 97.02 (r = 0.864, P < 0.001). Intravenous application of calcitonin did not affect caerulein-induced GBE. The results obtained imply that: (i) calcitonin exerts an inhibitory influence on meal-induced GBE and that this effect is more pronounced after i.v. than after i.c.v. administration, and (ii) peripherally given calcitonin does not inhibit caerulein-induced gallbladder contraction in the dog.
Jonderko
K
K
Department of Physiology, Institute of Occupational Medicine and Environmental Health, Sosnowiec, Poland.
Buéno
L
L
D000818:Animals; D002116:Calcitonin / Q000008:administration & dosage / Q000494:pharmacology*; D002552:Cerebral Ventricles; D002108:Ceruletide / Q000037:antagonists & inhibitors; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005502:Food; D005704:Gallbladder / Q000000981:diagnostic imaging / Q000187:drug effects* / Q000502:physiology; D005765:Gastrointestinal Agents / Q000037:antagonists & inhibitors; D007262:Infusions, Intravenous; D007275:Injections, Intravenous; D014463:Ultrasonography
D005765:Gastrointestinal Agents; D002108:Ceruletide; D002116:Calcitonin