溫州醫(yī)學(xué)院二附院的張國佑醫(yī)師在2011年4月的英國皮膚病學(xué)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(xì)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(xì)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(jìn)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(xì)胞核抗原表達(dá)和MTT比色轉(zhuǎn)換法評價1,25D3對細(xì)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(xì)胞中存在維生素D受體。纖維母細(xì)胞經(jīng)VDRE報告基因表達(dá)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(xì)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(dǎo)的I型膠原,纖連蛋白和α-平滑肌肌動蛋白的表達(dá)。1,25D還可調(diào)節(jié)TGF-β1誘導(dǎo)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(dá)。更有趣的是,1,25D3還可誘導(dǎo)瘢痕疙瘩纖維母細(xì)胞合成肝細(xì)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(jī)制,為下一步維生素D用于瘢痕疙瘩及相關(guān)纖維疾病的預(yù)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(xì)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(xì)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(jìn)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(xì)胞核抗原表達(dá)和MTT比色轉(zhuǎn)換法評價1,25D3對細(xì)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(xì)胞中存在維生素D受體。纖維母細(xì)胞經(jīng)VDRE報告基因表達(dá)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(xì)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(dǎo)的I型膠原,纖連蛋白和α-平滑肌肌動蛋白的表達(dá)。1,25D還可調(diào)節(jié)TGF-β1誘導(dǎo)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(dá)。更有趣的是,1,25D3還可誘導(dǎo)瘢痕疙瘩纖維母細(xì)胞合成肝細(xì)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(jī)制,為下一步維生素D用于瘢痕疙瘩及相關(guān)纖維性疾病預(yù)防治療的實驗研究提供了理論依據(jù)。
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