PPAR-delta senses and orchestrates clearance of apoptotic cells to promote tolerance.

PPAR-delta senses and orchestrates clearance of apoptotic cells to promote tolerance.
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DOI:
10.1038/nm.2048
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发表时间:
2009-11
期刊:
影响因子:
82.9
通讯作者:
--
中科院分区:
医学1区
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--
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巨噬细胞迅速吞噬凋亡细胞,以限制有害细胞内容物的释放,并限制针对自身抗原的自身免疫反应。尽管参与识别和吞噬凋亡细胞的因素已经被确定,但感知和静默处置凋亡细胞的转录基础尚不清楚。在这里,我们表明,当巨噬细胞吞噬凋亡细胞时,诱导了过氧化物酶体增殖物激活受体-δ(PPAR-δ),并作为死亡细胞的转录传感器发挥作用。PPAR-δ基因缺失会降低调理素的表达,如C1qb,导致细胞凋亡清除障碍和抗炎细胞因子的产生减少。这增加了自身抗体的产生,并使全局和巨噬细胞特异性的PPARd−/−小鼠容易患上自身免疫性肾脏疾病,这种疾病的表型类似于人类疾病系统性红斑狼疮。因此,PPAR-δ在协调巨噬细胞及时处理凋亡细胞,确保维持对自身的耐受性方面发挥着关键作用。
Macrophages rapidly engulf apoptotic cells to limit the release of noxious cellular contents and to restrict autoimmune responses against self antigens. Although factors participating in recognition and engulfment of apoptotic cells have been identified, the transcriptional basis for the sensing and silently disposing of apoptotic cells is unknown. Here we show that peroxisome proliferator activated receptor-δ (PPAR-δ) is induced when macrophages engulf apoptotic cells and functions as a transcriptional sensor of dying cells. Genetic deletion of PPAR-δ decreases expression of opsonins, such as C1qb, resulting in impairment of apoptotic cell clearance and reduction in anti-inflammatory cytokine production. This increases autoantibody production and predisposes global and macrophage-specific PPARd−/− mice to autoimmune kidney disease, a phenotype resembling the human disease systemic lupus erythematosus. Thus, PPAR-δ plays a pivotal role in orchestrating the timely disposal of apoptotic cells by macrophages, ensuring that tolerance to self is maintained.
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发表时间: 2004-05-14
期刊: SCIENCE
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