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. 1985 Oct;8(5):423-6.
doi: 10.1007/BF03348529.

Calmodulin in various insulin secreting cell types

D Janjic, C B Wollheim, A E Renold

Calmodulin in various insulin secreting cell types

D Janjic et al. J Endocrinol Invest. 1985 Oct.

Abstract

The involvement of the Ca2+ binding protein, calmodulin, in the regulation of insulin release was studied. Calmodulin was measured in isolated rat islets, rat insulinoma cells, the insulin secreting cell line (RINm5F) and in islets isolated from normal and diabetic Chinese hamsters. Total content of calmodulin was determined by a radioimmunoassay using a rabbit anti-calmodulin serum and was found to lie in the range of 4 to 7 micrograms/ml protein. When rat islets were maintained in tissue culture for 6 days at 2.8 or 8.3 mM glucose, the content of calmodulin of the two groups was similar. Likewise there was no difference in calmodulin content between islets from normal and diabetic hamsters. This study suggests that a variation of the total cellular calmodulin does not play a role in the process of insulin secretion.

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