溫州醫(yī)學院二附院的張國佑醫(yī)師在2011年4月的英國皮膚病學雜志BJD上公布了其研究結(jié)果:體外實驗中維生素D可緩解纖維化。
以下是摘要內(nèi)容:
Background Vitamin D and its metabolites play an important role in calcium homeostasis, bone remodelling, hormone secretion, cell proliferation and differentiation. Recent studies also suggest a beneficial role of vitamin D in slowing the progression of tissue fibrosis. However, their effects on dermal fibrosis and keloids are unknown.
背景:維生素D和其代謝物在鈣平衡、骨重塑、激素分泌、細胞增殖與分化中發(fā)揮重要的作用。近期研究還表明維生素D在減緩組織纖維化過程中可發(fā)揮有益作用,但其在皮膚纖維化和瘢痕疙瘩方面的作用還不明了
Objectives To investigate the effect of 1,25-dihydroxyvitamin D3 (1,25D) in the pathogenesis of tissue fibrosis by keloid fibroblasts (KFs)。
目的:調(diào)查1,25維生素D3對瘢痕疙瘩纖維母細胞KFs組織纖維化過程的影響
Methods KFs were cultured and exposed to different concentrations of 1,25D in the presence or absence of transforming growth factor (TGF)-β1. KF phenotypes and protein production were analysed by real-time reverse transcriptase-polymerase chain reaction, Western blot, immunofluorescence and multiplex enzyme-linked immunosorbent assay techniques. Collagen synthesis was evaluated by measuring 3H-proline incorporation. The effect of 1,25D on cell proliferation and viability was evaluated by Formazan assay, proliferating cell nuclear antigen expression and the colorimetric conversion of 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide.
方法:在伴或不伴轉(zhuǎn)移生長因子TGF-β1的條件下,KFs暴露于不同濃度的1,25D3.利用實時RT-PCR,Western blot,免疫熒光和ELISA法對KF表型,蛋白生成進行分析。通過測定3H-proline吸收分析膠原合成情況。利用Formazan assay,增殖細胞核抗原表達和MTT比色轉(zhuǎn)換法評價1,25D3對細胞增殖和活力的影響。
Results We confirmed the presence of vitamin D receptors (VDRs) in cultured keloid fibroblasts. Fibroblasts transfected with a vitamin D response element reporter construct and exposed to the active vitamin D metabolite 1,25D showed increased promoter activity indicating VDR functionality in these cells. Incubation of KFs with 1,25D suppressed TGF-β1-induced collagen type I, fibronectin and -smooth muscle actin expression. 1,25D also modulated plasminogen activator inhibitor-1 and matrix metalloproteinase-9 expression induced by TGF-β1. Interestingly, 1,25D induced hepatocyte growth factor mRNA expression and protein secretion in keloid fibroblasts.
結(jié)果:我們證實了在培養(yǎng)的瘢痕疙瘩纖維母細胞中存在維生素D受體。纖維母細胞經(jīng)VDRE報告基因表達載體轉(zhuǎn)染后暴露于維生素D活性代謝物1,25維生素D3,其啟動子活性增強,表明這些細胞中存在功能性的維生素D受體VDR.KFs與1,25D3共同孵育可抑制TGF-β1誘導的I型膠原,纖連蛋白和α-平滑肌肌動蛋白的表達。1,25D還可調(diào)節(jié)TGF-β1誘導的纖溶酶原激活物抑制物-1和基質(zhì)金屬蛋白酶-9的表達。更有趣的是,1,25D3還可誘導瘢痕疙瘩纖維母細胞合成肝細胞生長因子mRNA并分泌蛋白
Conclusions This study highlights key mechanistic pathways through which vitamin D decreases fibrosis, and provides a rationale for studies to test vitamin D supplementation as a preventive and/or early treatment strategy for keloid and related fibrotic disorders
結(jié)論:該研究闡明了維生素D3緩解纖維化的主要機制,為下一步維生素D用于瘢痕疙瘩及相關纖維疾病的預防治療提供了理論依據(jù)。
背景:維生素D和其代謝物在鈣平衡、骨重塑、激素分泌、細胞增殖與分化中發(fā)揮重要的作用。近期研究還表明維生素D在減緩組織纖維化過程中可發(fā)揮有益作用,但其在皮膚纖維化和瘢痕疙瘩方面的作用還不明了
目的:調(diào)查1,25維生素D3對瘢痕疙瘩纖維母細胞KFs組織纖維化過程的影響
方法:在伴或不伴轉(zhuǎn)移生長因子TGF-β1的條件下,KFs暴露于不同濃度的1,25D3.利用實時RT-PCR,Western blot,免疫熒光和ELISA法對KF表型,蛋白生成進行分析。通過測定3H-proline吸收分析膠原合成情況。利用Formazan assay,增殖細胞核抗原表達和MTT比色轉(zhuǎn)換法評價1,25D3對細胞增殖和活力的影響。
結(jié)果:我們證實了在培養(yǎng)的瘢痕疙瘩纖維母細胞中存在維生素D受體。纖維母細胞經(jīng)VDRE報告基因表達載體轉(zhuǎn)染后,暴露于維生素D活性代謝物——1,25D3中,其啟動子活性增強,表明這些細胞中存在功能性的維生素D受體VDR.KFs與1,25D3共同孵育可抑制TGF-β1誘導的I型膠原,纖連蛋白和α-平滑肌肌動蛋白的表達。1,25D還可調(diào)節(jié)TGF-β1誘導的纖溶酶原激活物抑制物-1和基質(zhì)金屬蛋白酶-9的表達。更有趣的是,1,25D3還可誘導瘢痕疙瘩纖維母細胞合成肝細胞生長因子mRNA并分泌蛋白
結(jié)論:該研究闡明了維生素D3緩解纖維化的主要機制,為下一步維生素D用于瘢痕疙瘩及相關纖維性疾病預防治療的實驗研究提供了理論依據(jù)。
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