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肥胖状态下,富含半胱氨酸的酸性分泌蛋白(SPARC)的蛋白水解同工型可诱导脂肪基质细胞动员。

Proteolytic Isoforms of SPARC Induce Adipose Stromal Cell Mobilization in Obesity.

作者信息

Tseng Chieh, Kolonin Mikhail G

机构信息

Center for Metabolic and Degenerative Diseases, The Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, Texas, 77030, USA.

出版信息

Stem Cells. 2016 Jan;34(1):174-90. doi: 10.1002/stem.2192. Epub 2015 Sep 22.

Abstract

Adipose stromal cells (ASC) are mesenchymal adipocyte progenitors that reside in the peri-endothelium of fat tissue. ASC mobilization and migration accompany white adipose tissue (WAT) remodeling and pathological conditions. Mechanisms regulating ASC trafficking are largely unknown. We previously reported that binding of the matricellular protein secreted protein acidic and rich in cysteine (SPARC) to β1 integrin on ASC surface induces their motility. Here, we show that SPARC is required for ASC mobilization. We report two SPARC proteolytic isoforms, C-SPARC (lacking the N terminus) and N-SPARC (lacking the C terminus), generated in mesenteric WAT of obese mice. C-SPARC, but not N-SPARC, binds to β1 integrin on ASC, while N-SPARC preferentially binds to the extracellular matrix (ECM) and blocks ECM/integrin interaction. Interestingly, both C-SPARC and N-SPARC induce ASC deadhesion from the ECM, which is associated with modulation of integrin-dependent FAK-ERK signaling and integrin-independent ILK-Akt signaling. We show that these SPARC isoforms, acting on ASC through distinct mechanisms, have an additive effect in inducing ASC migration.

摘要

脂肪基质细胞(ASC)是存在于脂肪组织血管周围的间充质脂肪细胞祖细胞。ASC的动员和迁移伴随着白色脂肪组织(WAT)的重塑和病理状况。调节ASC运输的机制在很大程度上尚不清楚。我们之前报道过,基质细胞蛋白富含半胱氨酸的酸性分泌蛋白(SPARC)与ASC表面的β1整合素结合可诱导其运动。在此,我们表明SPARC是ASC动员所必需的。我们报道了在肥胖小鼠肠系膜WAT中产生的两种SPARC蛋白水解异构体,C-SPARC(缺少N端)和N-SPARC(缺少C端)。C-SPARC而非N-SPARC与ASC上的β1整合素结合,而N-SPARC优先与细胞外基质(ECM)结合并阻断ECM/整合素相互作用。有趣的是,C-SPARC和N-SPARC均诱导ASC从ECM上脱黏附,这与整合素依赖性FAK-ERK信号和整合素非依赖性ILK-Akt信号的调节有关。我们表明,这些通过不同机制作用于ASC的SPARC异构体在诱导ASC迁移方面具有累加效应。

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