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Herein, we determined if there is a correlation between RNASET2 content on human spermatozoa and sperm motility in 205 semen samples from both asthenozoospermia patients and normozoospermia individuals. RNASET2 content was higher in sperm from asthenozoospermia patients than in normozoospermia individuals. On the other hand, its content was inversely correlated with sperm motility as well as progressive motility. Moreover, the inhibitory effect of RNASET2 on sperm motility was induced by incubating normozoospermic sperm with RNase T2 protein. Such treatment caused significant declines in intracellular spermatozoa PKA activity, PI3K activity and calcium level, which resulted in severely impaired sperm motility, and the sperm motility was largely rescued by cAMP supplementation. Finally, protein immunoprecipitation and mass spectrometry identified proteins whose interactions with RNASET2 were associated with declines in human spermatozoa motility. AKAP4, a protein regulating PKA activity, coimmunoprecipated with RNASET2 and they colocalized with one another in the sperm tail, which might contribute to reduced sperm motility. Thus, RNASET2 may be a novel biomarker of asthenozoospermia. Increases in RNASET2 can interact with AKAP4 in human sperm tail and subsequently reduce sperm motility by suppressing PKA\/PI3K\/calcium signaling pathways.<\/jats:p>","DOI":"10.1530\/rep-17-0746","type":"journal-article","created":{"date-parts":[[2018,3,26]],"date-time":"2018-03-26T12:36:06Z","timestamp":1522067766000},"page":"383-392","update-policy":"https:\/\/doi.org\/10.1530\/crossmarkpolicy-1","source":"Crossref","is-referenced-by-count":31,"title":["RNASET2 impairs the sperm motility via PKA\/PI3K\/calcium signal pathways"],"prefix":"10.1093","volume":"155","author":[{"given":"Yali","family":"Xu","sequence":"first","affiliation":[{"name":"Department of Histology , Embryology, Genetics and Developmental Biology, Shanghai Key Laboratory for Reproductive Medicine, School of Medicine, Shanghai Jiao Tong University, Shanghai, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yong","family":"Fan","sequence":"additional","affiliation":[{"name":"Department of 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