Effects of cholecystokinin and carbamylcholine on Paneth cell secretion in mice: a comparison with pancreatic acinar cells.
To confirm whether the Paneth cells of mice (ICR, male, 10-12 weeks old) have the same secretory response to hormonal and cholinergic stimulation as do pancreatic acinar cells, ultrastructural changes of Paneth cells and pancreatic acinar cells 1 hr after administration of various doses of cholecystokinin (octapeptide, CCK-8) and carbamylcholine were morphometrically assessed. After maximal (1.5 micrograms/kg intraperitoneally [i.p.]) and supramaximal (15 micrograms/kg, i.p.) stimulation by CCK-8, pancreatic acinar cells showed, respectively, degranulation or disturbance of secretion (e.g., an increase in lysosome-like bodies, aggregation of zymogen granules). The Paneth cells, however, were almost unchanged in the parameters examined. After carbamylcholine injection (1,000 micrograms/kg, subcutaneously [s.c.]), both pancreatic acinar cells and Paneth cells showed degranulation. Paneth cells sometimes developed large vacuoles, probably formed after massive exocytosis; such vacuoles were not observed in pancreatic acinar cells. It is suggested that Paneth cells and pancreatic acinar cells have different secretory responses. Paneth cell secretion, which possibly plays a role in controlling the intestinal bacterial milieu, may be stimulated by cholinergic rather than hormonal mechanisms.
Satoh
Y
Y
Department of Anatomy, Asahikawa Medical College, Japan.
Ishikawa
K
K
Oomori
Y
Y
Yamano
M
M
Ono
K
K
D000818:Animals; D002217:Carbachol / Q000494:pharmacology*; D002766:Cholecystokinin / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D007413:Intestinal Mucosa / Q000166:cytology* / Q000378:metabolism / Q000648:ultrastructure; D007421:Intestine, Small / Q000166:cytology* / Q000648:ultrastructure; D008297:Male; D051379:Mice; D008813:Mice, Inbred ICR; D008854:Microscopy, Electron; D010179:Pancreas / Q000166:cytology / Q000378:metabolism / Q000648:ultrastructure
D002217:Carbachol; D002766:Cholecystokinin