Cell-intrinsic lysosomal lipolysis is essential for alternative activation of macrophages.

Cell-intrinsic lysosomal lipolysis is essential for alternative activation of macrophages.
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DOI:
10.1038/ni.2956
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发表时间:
2014-09
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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通过白细胞介素4受体α(IL - 4Rα)驱动的替代性(M2)巨噬细胞活化对寄生虫免疫、伤口愈合、动脉粥样硬化的预防以及代谢稳态都很重要。M2极化依赖于脂肪酸氧化(FAO),但支持这一代谢过程的脂肪酸来源尚不清楚。我们发现,通过CD36摄取三酰甘油底物以及随后溶酶体酸性脂肪酶(LAL)对其进行的脂解作用,对于增强氧化磷酸化(OXPHOS)、提高备用呼吸能力(SRC)、延长细胞存活以及共同定义M2活化的基因表达都很重要。脂解作用的抑制会在寄生性蠕虫感染期间抑制M2活化,并阻断针对这种病原体的保护性反应。我们的研究结果阐明了细胞内溶酶体脂解在M2活化中的关键作用。
Alternative (M2) macrophage activation driven through interleukin 4 receptor α (IL-4Rα) is important for immunity to parasites, wound healing, the prevention of atherosclerosis and metabolic homeostasis. M2 polarization is dependent on fatty acid oxidation (FAO), but the source of fatty acids to support this metabolic program has not been clear. We show that the uptake of triacylglycerol substrates via CD36 and their subsequent lipolysis by lysosomal acid lipase (LAL) was important for the engagement of elevated oxidative phosphorylation (OXPHOS), enhanced spare respiratory capacity (SRC), prolonged survival and expression of genes that together define M2 activation. Inhibition of lipolysis suppressed M2 activation during infection with a parasitic helminth, and blocked protective responses against this pathogen. Our findings delineate a critical role for cell-intrinsic lysosomal lipolysis in M2 activation.
记忆CD8(+)T细胞使用细胞中性脂解来支持开发所需的代谢编程。
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