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Islet amyloid polypeptide and insulin secretion from isolated perfused pancreas of fed, fasted, glucose-treated, and dexamethasone-treated rats.

Abstract：

:Rats from four experimental treatment groups, including fed controls, 24- to 30-h fasted, dexamethasone-treated, and intraperitoneal glucose-treated, were used to assess the effects of these treatments on the immunohistochemically detectable islet amyloid polypeptide (IAPP) content in the pancreatic islets. Isolated perfused pancreases from additional animals in these groups were used to assess insulin and IAPP secretion and relative amounts of these hormones secreted into the perfusate under low-glucose (2.75 mM) and high-glucose (16.7 mM) conditions. Insulin and IAPP concentrations in the perfusate were measured by radioimmunoassays. Titration of immunohistochemical staining revealed the highest levels of IAPP in the dexamethasone- and glucose-treated groups, followed by the fed controls; the least amount was observed in the fasted group. In the perfusion experiments, the dexamethasone-treated group had significantly higher IAPP secretion than did all of the other groups under stimulation with 16.7 mM glucose. In addition, both dexamethasone treatment and glucose treatment increased the relative amount of IAPP to insulin secretion during 16.7 mM glucose stimulation in comparison with fed controls and fasted groups. Fasting tended to have the opposite effect and significantly decreased the relative amount of IAPP to insulin secreted under stimulation with 16.7 mM glucose. In all groups, IAPP and insulin secretion were generally parallel, which is consistent with their colocalization in the beta-cell secretory vesicle and co-release after glucose stimulation. However, significant differences in the insulin-IAPP ratios between experimental groups is consistent with the hypothesis that production of IAPP and insulin are regulated differently in the beta-cell.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Diabetes

journal_title

Diabetes

authors

O'Brien TD,Westermark P,Johnson KH

doi

10.2337/diab.40.12.1701

subject

Has Abstract

pub_date

1991-12-01 00:00:00

pages

1701-6

issue

eissn

0012-1797

issn

1939-327X

journal_volume

pub_type

杂志文章

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Islet amyloid polypeptide and insulin secretion from isolated perfused pancreas of fed, fasted, glucose-treated, and dexamethasone-treated rats.