首页> 外文期刊>Clinical immunology: The official journal of the Clinical Immunology Society >Increased HGF and c-Met in muscle tissues of polymyositis and dermatomyositis patients: beneficial roles of HGF in muscle regeneration.
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Increased HGF and c-Met in muscle tissues of polymyositis and dermatomyositis patients: beneficial roles of HGF in muscle regeneration.

机译:多发性肌炎和皮肌炎患者肌肉组织中HGF和c-Met的增加:HGF在肌肉再生中的有益作用。

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摘要

We investigated the expression of hepatocyte growth factor (HGF), which has mitogenic and anti-fibrotic activities, in muscle tissue of polymyositis/dermatomyositis (PM/DM) patients, as well as its functional roles in cultured myoblasts. Immunohistochemistry in muscle from PM/DM patients revealed that HGF was expressed predominantly on infiltrating mononuclear cells and that muscle cells expressed the receptor c-met. Cultured myoblasts produced HGF; which was increased by IL-1alpha but suppressed by TGF-beta and dexamethasone. Exogenous HGF induced myoblast proliferation and reduced procollagen type I production. Furthermore, HGF enhanced the gene expression of muscle regulatory factors MyoD and Myf5, while suppressing expression of fibrosis-related genes, connective tissue growth factor and alpha-smooth muscle actin. Although dexamethasone showed contrasting effects to HGF on the expression of these genes, co-treatment with HGF ameliorated the effects of dexamethasone. Taking the beneficial roles of HGF into consideration, administration of HGF might contribute to muscle regeneration in PM/DM especially under corticosteroid treatment.
机译:我们调查了肝细胞生长因子(HGF)在多发性肌炎/皮肌炎(PM / DM)患者的肌肉组织中的表达,该因子具有促有丝分裂和抗纤维化活性,并在培养的成肌细胞中发挥作用。 PM / DM患者肌肉中的免疫组织化学显示,HGF主要在浸润的单核细胞上表达,而肌肉细胞表达c-met受体。培养的成肌细胞产生了HGF。 IL-1α增加了它的含量,但TGF-β和地塞米松抑制了它的含量。外源HGF诱导成肌细胞增殖,并降低I型胶原原的产生。此外,HGF增强了肌肉调节因子MyoD和Myf5的基因表达,同时抑制了纤维化相关基因,结缔组织生长因子和α平滑肌肌动蛋白的表达。尽管地塞米松在这些基因的表达上与HGF表现出相反的作用,但与HGF共同治疗可改善地塞米松的作用。考虑到HGF的有益作用,尤其是在皮质类固醇治疗下,HGF的给药可能有助于PM / DM中的肌肉再生。

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