Fluid and protein secretion by the submandibular glands of weanling rats in response to cholinergic and peptidergic agonists at various doses.
Fluid and protein secretion by the submandibular glands of 25-day-old rats were examined and compared in response to three cholinergic and four peptidergic sialogogues at various doses. All cholinergic and peptidergic agonists used were potent sialogogues for the submandibular glands of the weanling rats over the wide range of doses used. The cholinergic agonists, bethanechol and methacholine and the peptidergic agonists, substance P, substance PTyr8 and eledoisin-related peptide used intravenously, acted similarly to each other on the submandibular glands of the rats, late in the natural weaning period, but carbachol and physalaemin had slightly different effects. Of the peptidergic agonists, physalaemin was the most potent sialogogue among four tachykinins tested at the low dose. The types of protein secreted by the submandibular glands of the weanling rats in response to all sialogogues used here were typical of the beta-type. These results indicate that all agonists used could mainly stimulate the acinar cells of the submandibular glands of the weanling rats which have already fully developed functionally at this time.
Baba
A
A
Department of Pediatric Dentistry, Fukuoka Dental College, Japan.
Taniguchi
K
K
Motokawa
W
W
Ishibashi
K
K
Okina
A
A
Abe
K
K
D000818:Animals; D018678:Cholinergic Agents / Q000008:administration & dosage / Q000494:pharmacology*; D002940:Circadian Rhythm / Q000502:physiology; D004305:Dose-Response Relationship, Drug; D008297:Male; D009479:Neuropeptides / Q000008:administration & dosage / Q000494:pharmacology*; D051381:Rats; D017207:Rats, Sprague-Dawley; D012463:Saliva / Q000187:drug effects / Q000201:enzymology; D012471:Salivary Proteins and Peptides / Q000378:metabolism*; D012472:Salivation / Q000187:drug effects*; D013363:Submandibular Gland / Q000166:cytology / Q000187:drug effects / Q000378:metabolism*
D018678:Cholinergic Agents; D009479:Neuropeptides; D012471:Salivary Proteins and Peptides