Senescent cells suppress macrophage-mediated corpse removal via upregulation of the CD47-QPCT/L axis.

Senescent cells suppress macrophage-mediated corpse removal via upregulation of the CD47-QPCT/L axis.
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衰老细胞通过上调 CD47-QPCT/L 轴抑制巨噬细胞介导的尸体清除。

DOI:
10.1083/jcb.202207097
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发表时间:
2023-02-06
期刊:
The Journal of cell biology
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衰老和慢性疾病中衰老细胞的进行性积累与组织稳态的有害影响相关。我们发现,衰老的成纤维细胞和上皮细胞不仅难治巨噬细胞介导的吞噬和清除,但他们也瘫痪了巨噬细胞清除旁观者凋亡尸体的能力。衰老细胞介导的巨噬细胞抑制(SCES)是独立的衰老相关的分泌表型(SASP),而是需要直接接触之间的巨噬细胞和衰老细胞。SCES涉及增加的衰老细胞表达的CD 47与增加的CD 47修饰酶QPCT/L一致。通过干扰SIRPα-CD 47-SHP-1轴或QPCT/L活性,SCES是可逆的。虽然在体外和体内人类和小鼠衰老细胞中CD 47表达增加,但另一种含有ITIM的蛋白质CD 24在人类上皮衰老细胞中特异性地促进SCES,其中它补偿了CD 47的遗传缺陷。因此,CD 47和CD 24将衰老细胞的致病作用与稳态巨噬细胞功能(如巨噬细胞增多症)联系起来,我们假设这必须有效地发生以维持组织稳态。
Progressive accrual of senescent cells in aging and chronic diseases is associated with detrimental effects in tissue homeostasis. We found that senescent fibroblasts and epithelia were not only refractory to macrophage-mediated engulfment and removal, but they also paralyzed the ability of macrophages to remove bystander apoptotic corpses. Senescent cell-mediated efferocytosis suppression (SCES) was independent of the senescence-associated secretory phenotype (SASP) but instead required direct contact between macrophages and senescent cells. SCES involved augmented senescent cell expression of CD47 coinciding with increased CD47-modifying enzymes QPCT/L. SCES was reversible by interfering with the SIRPα-CD47-SHP-1 axis or QPCT/L activity. While CD47 expression increased in human and mouse senescent cells in vitro and in vivo, another ITIM-containing protein, CD24, contributed to SCES specifically in human epithelial senescent cells where it compensated for genetic deficiency in CD47. Thus, CD47 and CD24 link the pathogenic effects of senescent cells to homeostatic macrophage functions, such as efferocytosis, which we hypothesize must occur efficiently to maintain tissue homeostasis.
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