GIPR Is Predominantly Localized to Nonadipocyte Cell Types Within White Adipose Tissue.

GIPR Is Predominantly Localized to Nonadipocyte Cell Types Within White Adipose Tissue.
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DOI:
10.2337/db21-1166
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发表时间:
2022-05-01
期刊:
影响因子:
7.7
通讯作者:
Drucker DJ
Drucker DJ
中科院分区:
医学1区
文献类型:
--
作者:
Campbell JE;Beaudry JL;Svendsen B;Baggio LL;Gordon AN;Ussher JR;Wong CK;Gribble FM;D'Alessio DA;Reimann F;Drucker DJ

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胰促胰岛素激素葡萄糖依赖型胰岛素多肽(GIP)通过其受体在胰岛β细胞上的表达增加葡萄糖依赖型胰岛素的分泌。GIP也作用于脂肪组织,但矛盾的是,增强和减少的GIP受体(GIPR)信号都会减少脂肪组织质量,并减轻营养过剩导致的体重增加。此外,白色脂肪组织(WAT)中GIPR表达的精确细胞定位仍然不确定。在这里,我们使用小鼠遗传学来靶向脂肪细胞内Gipr的表达。令人惊讶的是,使用脂联素(Adipoq)启动子靶向脂肪细胞表达Cre并没有显著降低Adipoq-Cre:Giprflx/flx小鼠中WAT Gipr的表达。相比之下,在CMV启动子的控制下,腺病毒表达Cre,或使用非脂肪细胞选择性启动子(Ap2/Fabp4和Ubc)转基因表达Cre,可显著降低WAT Gipr的表达。对单核RNA-seq脂肪组织数据集的分析表明,Gipr/ Gipr主要表达于周细胞和间皮细胞,而不是脂肪细胞。总之,这些观察结果揭示了脂肪细胞不是WAT中主要的GIPR+细胞类型,这些发现对理解GIP和基于GIP的协同激动剂如何控制脂肪组织生物学具有机制意义。
The incretin hormone glucose-dependent insulinotropic polypeptide (GIP) augments glucose-dependent insulin secretion through its receptor expressed on islet β-cells. GIP also acts on adipose tissue, yet paradoxically, both enhanced and reduced GIP receptor (GIPR) signaling reduce adipose tissue mass and attenuate weight gain in response to nutrient excess. Moreover, the precise cellular localization of GIPR expression within white adipose tissue (WAT) remains uncertain. Here, we used mouse genetics to target Gipr expression within adipocytes. Surprisingly, targeting Cre expression to adipocytes using the Adiponectin (Adipoq) promoter did not produce meaningful reduction of WAT Gipr expression in Adipoq-Cre:Giprflx/flx mice. In contrast, adenoviral expression of Cre under the control of the CMV promoter, or transgenic expression of Cre using non-adipocyte-selective promoters (Ap2/Fabp4 and Ubc) markedly attenuated WAT Gipr expression. Analysis of single nucleus RNA-seq adipose tissue data sets localized Gipr/GIPR expression predominantly to pericytes and mesothelial cells rather than to adipocytes. Together, these observations reveal that adipocytes are not the major GIPR+ cell type within WAT, findings with mechanistic implications for understanding how GIP and GIP-based co-agonists control adipose tissue biology.
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