Faculty Collaboration Database

Ontogeny of secretory function and cholecystokinin binding capacity in immature rat pancreas. Life Sci 1987 Jun 08;40(23):2237-45

Date

06/08/1987

Pubmed ID

2438529

DOI

10.1016/0024-3205(87)90059-2

Scopus ID

2-s2.0-0023198911 (requires institutional sign-in at Scopus site)   19 Citations

Abstract

Isolated acini were prepared from the pancreas of immature rats (age less than 1 hr. - 48 hrs) in order to study the development of the secretory process. The ultrastructural integrity of the acinar cells was maintained after digestion and stimulation with secretagogues. Acini prepared from rats aged 24 - 48 hours responded to both CCK-8 and carbachol with significant increases in amylase release. Although typical biphasic dose response curves were obtained, the curves were shifted to the right by 1 - 2 log units, compared to the responses of adult acini. At ages younger than 24 hours, acini were insensitive to secretagogues but were sensitive to the calcium ionophore A23187. CCK receptors were virtually absent from membranes prepared from newborn pancreases, but binding of CCK, although small, was measurable at 12 hours and slowly increased up to 48 hours. A greater amount of binding was seen at 72 hours, which appeared constant up to 14 days. At 21 days, adult levels of binding were found. These results confirm previous studies that the rat pancreas is insensitive to secretagogues in the first 24 hours of life. After age 24 hours the secretory process is intact but less sensitive to secretory agents than the more mature pancreas. In the case of CCK, this may be due to lesser numbers of CCK receptors and/or affinity of CCK for its receptor.

Author List

Werlin SL, Colton DG, Harb J, Reynolds E, Hoffman RG, Williams JA

Author

Steven L. Werlin MD Emeritus Professor in the Pediatrics department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Age Factors
Amylases
Animals
Calcimycin
Carbachol
Dose-Response Relationship, Drug
Female
In Vitro Techniques
Pancreas
Pregnancy
Rats
Rats, Inbred Strains
Receptors, Cholecystokinin
Sincalide