期刊
MOLECULAR AND CELLULAR ENDOCRINOLOGY
卷 226, 期 1-2, 页码 59-66出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.mce.2004.06.001
关键词
diabetes; circadian rhythms; thyrotroph embryonic factor (TEF); albumin site D-binding protein (DBP); insulin-secreting cells; serum shock; Glut2
Both transcription factors albumin site D-binding protein (DBP) and thyrotroph embryonic factor (TEF) are elements of the cell-clock. Their circadian accumulation in suprachiasmatic nucleus (SCN) and peripheral tissues such as liver, kidney and lung is thought to participate in controlling circadian regulation of downstream genes. TEF and DBP control elements have never been investigated in the insulin-secreting cells, but impairment of the circadian rhythm of the beta-cells might be involved in the development of diabetic state as type 2 diabetics have lost daily temporal variations of insulin secretion. We investigated the expression pattern of TEF and DBP in insulin-secreting cells. TEF and DBP transcripts are expressed at extremely high levels in human pancreatic islets compared to other tissues, suggesting a potentially important circadian regulation of these cells. Both TEF and DPB accumulate in a circadian way in insulin-secreting cells after a serum shock known to restore circadian rhythms in cultured cells. In addition, the expression of islet-specific genes involved in glucose sensing (glucose transporter 2 (Glut2), glucokinase), insulin production (insulin) and secretion (migration inhibitory factor (MIF), somatostatin and syntaxin 1A) were modulated in the same daily rhythm as well. The circadian deregulation of these genes could therefore participate in the diabetic state development. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
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