Local proliferation of macrophages contributes to obesity-associated adipose tissue inflammation.

Local proliferation of macrophages contributes to obesity-associated adipose tissue inflammation.
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巨噬细胞的局部扩散有助于与肥胖相关的脂肪组织炎症。

DOI:
10.1016/j.cmet.2013.11.017
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发表时间:
2014-01-07
期刊:
影响因子:
29
通讯作者:
Aouadi M
Aouadi M
中科院分区:
生物学1区
文献类型:
--
作者:
Amano SU;Cohen JL;Vangala P;Tencerova M;Nicoloro SM;Yawe JC;Shen Y;Czech MP;Aouadi M

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肥胖小鼠和人类的脂肪组织(AT)会积聚免疫细胞,这些免疫细胞分泌的细胞因子可促进胰岛素抵抗。脂肪组织巨噬细胞(ATMs)被认为来源于骨髓衍生的单核细胞,它们从循环系统渗入组织。在此我们发现,正如通过Ki67表达和5 - 乙炔基 - 2′ - 脱氧尿苷掺入所检测到的,很大一部分巨噬细胞出乎意料地在脂肪组织内局部进行细胞分裂。内脏脂肪组织(VAT)内的巨噬细胞,但不包括肝脏和脾脏等其他组织中的巨噬细胞,在肥胖情况下表现出增殖增加。重要的是,血液单核细胞的耗竭对脂肪组织巨噬细胞数量没有影响,而它们的原位增殖仍在继续。用单核细胞趋化蛋白1(MCP - 1)处理可诱导脂肪组织外植体中的巨噬细胞分裂,而体内MCP - 1缺乏会降低脂肪组织巨噬细胞的增殖。这些结果表明,由MCP - 1驱动的原位增殖是肥胖情况下巨噬细胞在内脏脂肪组织中积聚的一个重要过程,此外还有血液单核细胞的募集。
Adipose tissue (AT) of obese mice and humans accumulates immune cells, which secrete cytokines that can promote insulin resistance. AT macrophages (ATMs) are thought to originate from bone marrow-derived monocytes, which infiltrate the tissue from the circulation. Here we show that a major fraction of macrophages unexpectedly undergo cell division locally within AT, as detected by Ki67 expression and 5-ethynyl-2′-deoxyuridine incorporation. Macrophages within the visceral AT (VAT), but not those in other tissues, including liver and spleen, displayed increased proliferation in obesity. Importantly, depletion of blood monocytes had no impact on ATM content, while their proliferation in situ continued. Treatment with monocyte chemotactic protein 1 (MCP-1) induced macrophage cell division in AT explants, while MCP-1 deficiency in vivo decreased ATM proliferation. These results reveal that proliferation in situ driven by MCP-1 is an important process by which macrophages accumulate in the VAT in obesity, in addition to blood monocyte recruitment.
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