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Heterogeneity in glutamic acid decarboxylase expression among single rat pancreatic beta cells.

Abstract：

AIMS/HYPOTHESIS:An isoform of glutamic acid decarboxylase, (GAD)65 has been identified as a pancreatic beta-cell autoantigen in Type I (insulin dependent) diabetes mellitus. We investigated the expression of GAD isoforms among single rat beta cells in culture, under different conditions and the correlation between GAD65 expression and insulin secretion-rate. RESULTS:Independent of culture conditions, 100 % of fresh and cultured beta cells express GAD67. In contrast, considerable heterogeneity in GAD65 expression among single beta cells was observed. After 2 days in culture in 2.6 mmol/l glucose, only 24 % of the beta cells express GAD65. This percentage increases to 39 % in 5.6 mmol/l glucose and to 54 % and 56 % in 11.6 mmol/l and 20.6 mmol/l glucose, respectively. Moreover, reducing glucose concentration from 11.6 to 2.5 mmol/l for 2 days, reduces GAD65 expression by nearly 30 %. After 11 days in culture with 11.6 mmol/l glucose, 50 % of beta cells continue expressing GAD65, this percentage is further increased to nearly 75 % by including either nerve growth factor or dibutyryl cyclic AMP or both in the culture medium. When beta cells are challenged for 1 h with 20.6 mmol/l glucose, 67 % respond forming insulin-immunoplaques. More than two-thirds of insulin-secretors are GAD65-positive, in contrast to only 11 % of the non-secreting cells. Moreover, 87 % of beta cells that have a high insulin secretory rate express GAD65. CONCLUSION/INTERPRETATION:These results show that the most active beta cells, which secrete more insulin, also express GAD65 and that manipulating extracellular glucose may modify the expression of the enzyme and possibly the autoimmune attack in Type I diabetes.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Sánchez-Soto MC,Larrieta ME,Vidaltamayo R,Hiriart M

doi

10.1007/s001250051275

subject

Has Abstract

pub_date

1999-09-01 00:00:00

pages

1086-92

issue

9

eissn

0012-186X

issn

1432-0428

pii

90421086.125

journal_volume

42

pub_type

杂志文章

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