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首页> 外文期刊>The Journal of investigative dermatology. >Ganglioside GM3 depletion reverses impaired wound healing in diabetic mice by activating IGF-1 and insulin receptors
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Ganglioside GM3 depletion reverses impaired wound healing in diabetic mice by activating IGF-1 and insulin receptors

机译:神经节苷脂GM3耗竭通过激活IGF-1和胰岛素受体逆转糖尿病小鼠伤口愈合不良

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摘要

Ganglioside GM3 mediates adipocyte insulin resistance, but the role of GM3 in diabetic wound healing, a major cause of morbidity, is unclear. The purpose of this study was to determine whether GM3 depletion promotes diabetic wound healing and directly activates keratinocyte (KC) insulin pathway signaling. GM3 synthase (GM3S) expression is increased in human diabetic foot skin, ob/ob and diet-induced obese diabetic mouse skin, and in mouse KCs exposed to increased glucose. GM3S knockout in diet-induced obese mice prevents the diabetic wound-healing defect. KC proliferation, migration, and activation of insulin receptor (IR) and insulin growth factor-1 receptor (IGF-1R) are suppressed by excess glucose in wild-type cells, but increased in GM3S -/- KCs with supplemental glucose. Co-immunoprecipitation of IR, IR substrate 1 (IRS-1), and IGF-1R, and increased IRS-1 and Akt phosphorylation accompany receptor activation. GM3 supplementation or inhibition of IGF-1R or PI3K reverses the increased migration of GM3S -/- KCs, whereas IR knockdown only partially suppresses migration.
机译:神经节苷脂GM3介导脂肪细胞胰岛素抵抗,但尚不清楚GM3在糖尿病伤口愈合中的作用,糖尿病伤口愈合是发病的主要原因。这项研究的目的是确定GM3耗竭是否促进糖尿病伤口的愈合并直接激活角质形成细胞(KC)胰岛素途径信号传导。 GM3合酶(GM3S)的表达在人糖尿病足皮肤,ob / ob和饮食诱导的肥胖糖尿病小鼠皮肤中以及在暴露于增加的葡萄糖的小鼠KC中增加。饮食诱导的肥胖小鼠中的GM3S基因敲除可预防糖尿病伤口愈合缺陷。野生型细胞中过量的葡萄糖抑制了胰岛素受体(IR)和胰岛素生长因子1受体(IGF-1R)的KC增殖,迁移和活化,但补充了葡萄糖的GM3S-/-KC中KC的增殖,迁移和活化受到抑制。 IR,IR底物1(IRS-1)和IGF-1R的共免疫沉淀以及IRS-1和Akt磷酸化的增加伴随受体激活。补充GM3或抑制IGF-1R或PI3K可逆转增加的GM3S-/-KCs迁移,而IR抑制仅部分抑制迁移。

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