Schach, Christian and Wester, Michael and Leibl, Florian and Redel, Andreas and Gruber, Michael and Maier, Lars S. and Endemann, Dierk and Wagner, Stefan (2020) Reduced store-operated Ca2+ entry impairs mesenteric artery function in response to high external glucose in type 2 diabetic ZDF rats. CLINICAL AND EXPERIMENTAL PHARMACOLOGY AND PHYSIOLOGY, 47 (7). pp. 1145-1157. ISSN 0305-1870, 1440-1681
Full text not available from this repository. (Request a copy)Abstract
Diabetes is a major risk factor for cardiovascular disease, affecting both endothelial and smooth muscle cells. Store-operated Ca2+ channels (SOCCs) have been implicated in many diabetic complications. Vascular dysfunction is common in patients with diabetes, but the role of SOCCs in diabetic vasculopathy is still unclear. Our research aimed to investigate the effects of high glucose (HG) on store-operated Ca2+ entry (SOCE) in small arteries. Small mesenteric arteries from type 2 diabetic Zucker fatty rats (ZDF) versus their non-diabetic controls (Zucker lean, ZL) were examined in a pressurized myograph. Vascular smooth muscle cells (VSMC) were isolated and intracellular Ca2+ was measured (Fura 2-AM). A specific protocol to deplete intracellular Ca2+ stores and thereby open SOCCs, as well as pharmacological SOCE inhibitors (SKF-96365, BTP-2), were used to artificially activate and inhibit SOCE, respectively. High glucose (40 mmol/L) relaxed arteries in a SKF-sensitive manner. Diabetic arteries exhibited reduced HG-induced relaxation, as well as reduced contraction after Ca2+ replenishment. Further, the rise in intracellular Ca2+ on account of SOCE is diminished in diabetic versus non-diabetic VSMCs and was insensitive to HG in diabetic VSMCs. The expression of SOCC proteins was measured, detecting a downregulation of Orai1 in diabetes. In conclusion, diabetes leads to a reduction of SOCE and SOCE-induced contraction, which is unresponsive to HG-mediated inhibition. The reduced expression of Orai1 in diabetic arteries could account for the observed reduction in SOCE.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CAPACITATIVE CALCIUM-ENTRY; SMOOTH-MUSCLE-CELLS; CHANNELS; STIM1; ACTIVATION; EXPRESSION; HYPERGLYCEMIA; VASODILATION; DYSFUNCTION; INFLUX; diabetes; high glucose; small mesenteric arteries; store-operated calcium entry; vascular smooth muscle; ZDF |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Innere Medizin II |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 29 Mar 2021 07:09 |
| Last Modified: | 29 Mar 2021 07:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/44887 |
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