In:
Journal of Endocrinology, Bioscientifica, Vol. 166, No. 3 ( 2000-09-1), p. 545-551
Abstract:
Oscillation of insulin release by the pancreatic islets was evaluated under stringent Ca(2+)-free conditions for the first time. Isolated single rat islets were exposed to 16.7 mM glucose in the presence of 1.9 mM Ca(2+), or under the stringent Ca(2+)-free conditions (Ca(2+) omission with 1 mM EGTA, 6 microM forskolin and 100 nM phorbol 12-myristate 13-acetate). Fifteen minutes after the initiation of glucose stimulation, effluent was collected at a 6-s interval, insulin was determined in duplicate by a highly sensitive insulin radioimmunoassay, and oscillation and pulsatility of release statistically analyzed. Significant oscillation of insulin release was observed in all islets irrespective of presence and absence of Ca(2+). Significant pulsatility of release was detected in 7 of 11 islets in the presence of Ca(2+) and three of six isl! ets in the absence of Ca(2+). In conclusion, high glucose elicits oscillatory insulin release both in the presence and absence of extracellular Ca(2+).
Type of Medium:
Online Resource
ISSN:
0022-0795
,
1479-6805
DOI:
10.1677/joe.0.1660545
Language:
Unknown
Publisher:
Bioscientifica
Publication Date:
2000
detail.hit.zdb_id:
1474892-7
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