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Delayed and atypical d-glyceraldehyde-induced insulin secretion from the perfused duodenum pancreas of chicken
Ist Teil von
General and comparative endocrinology, 1989, Vol.73 (1), p.129-135
Ort / Verlag
San Diego, CA: Elsevier Inc
Erscheinungsjahr
1989
Quelle
Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)
Beschreibungen/Notizen
Insulin release by the isolated-perfused pancreas of 5–8 week-old chickens was studied in response to graded concentrations of
d-glyceraldehyde (
d-GA) (5–20 m
M).
d-GA was perfused for 30 min in the absence or in the presence of glucose concentrations (2.8 or 14 m
M) which do not evoke insulin release alone.
d-GA alone or in combination with glucose does not cause a biphasic insulin release. As compared to rodents the release is reduced and delayed (at least 16 min) and requires higher
d-GA concentrations which reveals the insensitivity of the chicken pancreas to
d-GA. In the absence of glucose, the release is higher at 15 m
M
d-GA. Glucose (2.8 or 14 m
M) sensitized the pancreas to
d-GA by eliciting earlier and higher insulin response but never restored an immediate and biphasic secretory response to
d-GA. Glucose amplified the response to low
d-GA levels (5 and 10 m
M) and inhibited the response to higher concentrations (15 and 20 m
M). A transient insulin rise (“off-response”) related to the
d-GA concentration was observed after withdrawal of
d-GA either in the absence or in the presence of glucose. Therefore, in addition to glucose, the chicken pancreas is relatively insensitive to
d-GA suggesting that the mechanism leading to insulin release in response to nutrient metabolism is different in chickens as compared to that in mammals.