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调节脂肪组织纤维化中的原始细胞的细胞分化轨迹

Li Zhang¹, Xinjiang Cai¹, Xiuju Wu¹

¹Division of Cardiology, David Geffen School of Medicine at UCLA, USA.

Molecular metabolism

|August 8, 2025

概括

矩阵格拉蛋白 (MGP) 对于保持白色脂肪组织 (WAT) 的健康至关重要. 它的缺失通过破坏干细胞分化促进脂肪纤维化,突出MGP.

科学领域:

代谢研究的研究.
脂肪组织生物学脂肪组织生物学
纤维化机制纤维化机制

背景情况:

脂肪纤维化,白色脂肪组织 (WAT) 的病态重塑,与胰岛素抵抗和糖尿病等代谢疾病有关.
已知矩阵Gla蛋白 (MGP) 调节骨形态遗传蛋白 (BMP) 和转化生长因子β (TGFβ) 信号,但其在WAT纤维化中的具体作用尚不清楚.

研究的目的:

调查矩阵格拉蛋白 (MGP) 在白脂肪组织 (WAT) 纤维化发展中的作用.
阐明MGP缺乏对脂肪原生细胞 (APC) 和它们的分化途径的影响.

主要方法:

使用了基因改造小鼠,对Mgp基因进行了全球或脂肪原始细胞特异的删除.
使用单细胞RNA测序 (scRNA-seq) 来分析脂肪组织中的细胞变化.
进行脂肪和纤维组织的表型表征,并对BMP和TGFβ信号通路进行研究.

主要成果:

在小鼠中Mgp缺失导致WAT纤维化增加和脂肪生成受损.
ScRNA-seq识别了新的脂肪衍生干细胞 (ASC) 种群 (ASC1和ASC4),其来源于正常脂肪原体前体 (ASC2) 转向纤维原体分化.
抑制TGFβ信号传递或二乙酶-4 (DPP4) 活性可逆转纤维化并减少PDGFRα+;DPP4+细胞群.

结论:

矩阵Gla蛋白 (MGP) 对于平衡WAT.中脂肪原分化和纤维细胞激活至关重要.
PDGFRα+;DPP4+细胞的失调被认为是脂肪纤维化早期指标.

关键词:

脂肪性纤维化是一种脂肪性纤维化.脂肪原始细胞的分化.骨形态遗传蛋白质是一种骨形态遗传蛋白质.双基酸酶-4的二基-4的二基-4的二基-4的二基-4的矩阵格拉蛋白质 (Gla protein) 是一种蛋白质.单细胞RNA测序的一个细胞.转化生长因子β信号传递.白色脂肪组织的脂肪组织.

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