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首页> 外文期刊>Cell and Tissue Research >Salidroside improved cerebrovascular vasodilation in streptozotocin-induced diabetic rats through restoring the function of BKCa channel in smooth muscle cells
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Salidroside improved cerebrovascular vasodilation in streptozotocin-induced diabetic rats through restoring the function of BKCa channel in smooth muscle cells

机译:Salidroside通过恢复平滑肌细胞中BKCA通道的功能来改善链脲佐菌素诱导的糖尿病大鼠的脑血管血管血管舒张

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摘要

Vessel disease is a kind of severe complication in diabetic patients. However, few pharmacologic agents can directly recover diabetic vascular function. Salidroside (SAL), a major ingredient from Rhodiola rosea, has been found to have an obvious hypoglycemic effect and a beneficial protection on vascular function in diabetes. However, whether SAL is a suitable treatment for diabetes has not so far been evaluated and the underlying mechanisms remain unknown. The present work aims to (1) investigate the potential effects of SAL on cerebrovascular relaxation in streptozotocin-induced diabetic rats or when exposed to acute hyperglycemia condition and (2) examine whether function of the BKCa channel is involved in SAL treatment for diabetic vascular relaxation. Our results indicate that chronic administration of 100 mg/kg/day SAL not only improves cerebrovascular relaxation but also increases BKCa beta 1-subunit expressions at both protein and mRNA levels and enhances BKCa whole-cell and single-channel activities in cerebral VSMCs of diabetic rats. Correspondingly, acute application of 100 mu M SAL induces cerebrovascular relaxation by activation of the BKCa channel. Furthermore, SAL activated the BKCa channel mainly through acting on the beta 1-subunit in HEK293 cells transfected with hSlo alpha+beta 1 constructs. We concluded that SAL improved vasodilation in diabetic rats through restoring the function of the BKCa-beta 1 subunit in cerebrovascular smooth muscle cells, which may be the underlying mechanism responsible for the vascular protection of SAL in diabetes.
机译:血管疾病是糖尿病患者的一种严重并发症。然而,很少有药物能直接恢复糖尿病血管功能。红景天苷(Saldroside,SAL)是玫瑰红景天的主要成分,已被发现具有明显的降血糖作用,并对糖尿病患者的血管功能具有有益的保护作用。然而,到目前为止,SAL是否适合治疗糖尿病尚未得到评估,其潜在机制仍不清楚。本研究旨在(1)研究SAL对链脲佐菌素诱导的糖尿病大鼠或急性高血糖状态下脑血管舒张的潜在影响;(2)研究BKCa通道的功能是否参与SAL治疗糖尿病血管舒张。我们的研究结果表明,长期服用100mg/kg/天的SAL不仅可以改善脑血管舒张,还可以在蛋白质和mRNA水平上增加BKCaβ1亚单位的表达,并增强糖尿病大鼠脑血管平滑肌细胞的BKCa全细胞和单通道活性。相应地,急性应用100μM SAL通过激活BKCa通道诱导脑血管舒张。此外,SAL主要通过作用于转染hSloα+β1结构的HEK293细胞中的β1亚单位激活BKCa通道。我们得出结论,SAL通过恢复脑血管平滑肌细胞中BKCaβ1亚单位的功能来改善糖尿病大鼠的血管舒张功能,这可能是SAL在糖尿病中保护血管的潜在机制。

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