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An acute-phase protein as a regulator of sperm survival in the bovine oviduct: alpha 1-acid-glycoprotein impairs neutrophil phagocytosis of sperm in vitro.

J. Reprod. Dev.2014;60(5):342-8. Epub 2014 Jun 13
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摘要


We have previously shown that polymorphonuclear neutrophils are present in bovine oviduct fluid under physiological conditions, and that the oviduct provides a microenvironment that protects sperm from phagocytosis by Alpha 1-acid glycoprotein (AGP) is a major acute-phase protein produced mainly in the liver that has immunomodulatory functions. AGP mRNA is expressed in extrahepatic organs, such as the lung, kidney, spleen, lymph node, uterus, and ovary. Therefore, in this study, we investigated, 1) the local production of AGP in the bovine oviduct, 2) the effect of AGP on the phagocytic activity of for sperm and superoxide production and 3) the impact of AGP desialylation on the phagocytosis of sperm. The AGP gene was expressed in cultured bovine oviduct epithelial cells (BOECs) and AGP protein was detected in oviduct fluid. Preexposure of duanyu1451s to AGP at physiological levels impaired duanyu1451 phagocytosis for sperm and superoxide generation. The desialylation of AGP eliminated these suppressive effects of AGP on Scanning electron microscopy revealed that AGP drastically reduced the formation of DNA-based neutrophil extracellular traps (NETs) for sperm entanglement. Additionally, AGP dose-dependently stimulated BOECs to produce prostaglandin E2 (PGE2) which has been shown to partially contribute to the regulation of sperm phagocytosis in the bovine oviduct. AGP and PGE2 at concentrations detected in the oviducts additively suppressed sperm phagocytosis by duanyu1451s. These results provide evidence that locally produced AGP may be involved in protecting sperm from phagocytosis by duanyu1451s in the bovine oviduct.

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