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Publications (3)0.75 Total impact

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    ABSTRACT: To investigate the changes in aorta morphology and Ca(2+)-activated K(+) (KCa) channel expression in the diabetic rats. A diabetic rat model was established by a single intraperitoneal injection of streptozotocin (30 mg/kg) after a modified high fat and glucose diet for 8 weeks. Pathological changes in the aorta were observed with HE staining, elastic fiber staining, Masson's trichrome staining and immunohistochemistry. Both the mRNA and protein levels of KCa channels in the aorta were measured by RT-PCR and Western blotting. Early atherosclerotic changes were observed in the aorta wall of the diabetic rats. The mRNA and protein levels of KCa1.1 channel α- and β-subunits were significantly decreased, while the expression of KCa3.1 channels was obviously enhanced in the middle layer of the aorta in the diabetic rats. KCa channel switching in smooth muscles may play a role in the development of atherosclerosis in diabetic rats.
    Nan fang yi ke da xue xue bao = Journal of Southern Medical University 02/2014; 34(2):188-92.
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    ABSTRACT: Proliferation and migration of vascular smooth muscle cells (VSMCs) are important events in the development of diabetic atherosclerosis. Previous studies have suggested that KCa3.1 channels participate in atherosclerosis and coronary artery restenosis. In the present study, we attempted to clarify the roles of KCa3.1 channels in the proliferation and migration of VSMCs using experimental type-2 diabetes rat serum and aortic smooth muscle cells (SMC) prepared from non-diabetic rats. mRNA and protein levels and current density of KCa3.1 channels were greatly enhanced in cultured VSMCs treated with diabetic serum. In addition, diabetic serum promoted cell proliferation and migration in cultured VSMCs, and the effects were fully reversed in the cells treated with the KCa3.1 channels blocker TRAM-34. In conclusion, serum from diabetic rats increases the expression of KCa3.1 channels and promotes proliferation and migration of VSMCs to possibly participate in vascular remodeling in diabetes.
    The Chinese journal of physiology 06/2013; 56(3). · 0.75 Impact Factor
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    ABSTRACT: To investigate the role of K(Ca)3.1 channel in the proliferation and migration of rat vascular smooth muscle cells of the proliferative phenotype. Rat vascular smooth muscle cells (VSMCs) were cultured with tissue adhesion method. The morphological characteristics of the fist and ninth passages of VSMCs were observed with light and electron microscopy and immunocytochemistry. The expressions of K(Ca)3.1 channel mRNA and protein in the cells were detected using RT-PCR and immunocytochemistry, respectively. MTT and transwell assay were employed to assess the effect of the K(Ca)3.1 channel blocker TRAM-34 on the proliferation and migration of VSMCs. The first and ninth passages of VSMCs showed morphological characteristics of contractile and proliferative phenotypes, respectively. Compared with the first- passage cells, the ninth-passage VSMCs exhibited significantly increased K(Ca)3.1 channel mRNA and protein expressions with enhanced cell proliferation and migration (P<0.01), which was inhibited by the application of TRAM-34 (P<0.01). TRAM-34 produced no obvious effect on the first-passage VSMCs. Upregulated expression of K(Ca)3.1 channel can promote the proliferation and migration of rat VSMCs of the proliferative phenotype.
    Nan fang yi ke da xue xue bao = Journal of Southern Medical University 07/2012; 32(7):976-80.