PMID: 7024027Jul 1, 1981Paper

Lymphocytes from diabetics suppress insulin release in vitro

Diabetologia
C BoitardJ Hamburger

Abstract

The insulin response of isolated islet cells to glucose and theophylline in vitro was studied after incubation with lymphocytes. The test was employed to explore cell-mediated immunity in diabetics. A significant inhibition of insulin response to glucose and theophylline as compared to insulin release in a "basal" medium was found after incubation with blood lymphocytes from 21 out of 23 insulin-dependent diabetics (mean secretion index 18 +/- 18 versus 118 + 8 (SEM) % in control subjects). Most of the patients studied had associated autoimmune diseases: all of these displayed inhibition of insulin release. In six cases, the diabetes had a recent onset with no associated autoimmune disease: four of them displayed the same inhibition. No inhibition was found in the 26 control subjects and in seven non-insulin-dependent diabetics (mean secretion index 134 +/- 17 versus 145 +/- 23 (SEM) % in four control subjects). Lymphocytes inhibiting islet cell response were not cytotoxic against mouse fibroblasts. Twenty-two insulin-dependent diabetics showed islet cell antibodies to human and/or mouse pancreatic islets. However, an inhibition of insulin release was found with no detectable islet cell antibodies in one case, and the converse ...Continue Reading

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