Sperm induce macrophage extracellular trap formation via phagocytosis-dependent mechanism

细胞外 吞噬作用 巨噬细胞 精子 生物 中性粒细胞胞外陷阱 细胞生物学 精子无力症 精子活力 运动性 免疫学 炎症 生物化学 男性不育 不育 体外 怀孕 遗传学 植物
作者
Chuncheng Lu,Zhao Wu,Hongbin Gao,Haiyuan Li,Renbin Deng,Ning Luo,Shipeng Fan,Xi Li,Danpeng He,Hui Zhao
出处
期刊:Biology of Reproduction [Oxford University Press]
卷期号:109 (3): 319-329 被引量:1
标识
DOI:10.1093/biolre/ioad068
摘要

Infertility is a public health concern worldwide. Asthenozoospermia is a common cause of male infertility and is characterized by decreased motility. Sperm motility ensures that sperm migrate to complete fertilization. Macrophages are an essential component of innate immunity in the female reproductive tract. Macrophage extracellular traps are induced by various microorganisms to capture and mediate the clearance of microorganisms. The relationship between sperm and macrophage extracellular traps is unclear. The human monocyte leukemia (THP-1) cells differentiated by phorbol myristate acetate (PMA) are widely used as surrogate of human macrophages. This study investigated sperm-induced macrophage extracellular trap formation and clarified some of the mechanisms affecting macrophage extracellular trap production. Sperm-induced macrophage extracellular traps were visualized and components of macrophage extracellular traps were identified by immunofluorescence analyses and scanning electron microscopy. By inhibiting macrophage extracellular trap production and macrophage phagocytosis, the relationship between macrophage phagocytosis and macrophage extracellular trap production was analyzed. Sperm could trigger PMA-differentiated THP-1 macrophages to produce extracellular traps. Sperm-triggered macrophage extracellular traps are dependent on phagocytosis and nicotinamide adenine dinucleotide phosphate (NADPH) oxidase. Sperm from asthenozoospermia donors are more likely to be phagocytosed by macrophages than sperm from healthy donors, which induce more macrophage extracellular trap release. These data confirm the phenomenon and partial mechanism of sperm-induced macrophage extracellular trap formation in vitro. These may partly provide evidence to explain the mechanisms of clearing abnormally morphological or hypomotile sperm in the female reproductive tract and the rationale for the decreased probability of successful fertilization in asthenozoospermia.
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