Extracellular vesicles from seminal plasma to improve fertilizing capacity of bulls

in Reproduction and Fertility
Authors:
Anna Lange-ConsiglioA Lange-Consiglio, Department of Veterinary Medicine and Animal Science (DIVAS=, Università degli Studi di Milano, Lodi, Italy

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Emanuele CapraE Capra, Istituto di Biologia e Biotecnologia Agraria, Consiglio Nazionale delle Ricerche IBBA CNR, Lodi, Lodi, 26917, Italy

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Noemi MonferriniN Monferrini, Department of Veterinary Medicine and Animal Science (DIVAS=, Università degli Studi di Milano, Lodi, Italy

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Simone CanesiS Canesi, Department of Veterinary Medicine and Animal Science (DIVAS=, Università degli Studi di Milano, Lodi, Italy

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Giampaolo BosiG Bosi, Department of Veterinary Medicine and Animal Science (DIVAS=, Università degli Studi di Milano, Lodi, Italy

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Marina CretichM Cretich, Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche SCITEC-CNR, Milan, Italy., Milano, Italy

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Roberto FrigerioR Frigerio, Istituto di Scienze e Tecnologie Chimiche “Giulio Natta”, Consiglio Nazionale delle Ricerche SCITEC-CNR, Milan, Italy., Milano, Italy

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Valentina GalbiatiV Galbiati, Laboratory of Toxicology (DiSFeB) , Università degli Studi di Milano, Milano, Italy

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Federica BertuzzoF Bertuzzo, 5Intermizoo National Bull Centre of Vallevecchia, Caorle, Venezia, Italy., Venezia, Italy

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Francesco CobalchiniF Cobalchini, Intermizoo National Bull Centre of Vallevecchia, Caorle, Venezia, Italy., Venezia, Italy

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Fausto CremonesiF Cremonesi, Department of Veterinary Medicine and Animal Science (DIVAS), Università degli Studi di Milano, Lodi, Italy

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Bianca GasparriniB Gasparrini, Napoli, Italy

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Correspondence: Fausto Cremonesi, Email: fausto.cremonesi@unimi.it

Seminal plasma contains extracellular vesicles (EVs) that vehicle RNA, proteins, and other molecules able to influence the biological function of sperm. The aim of this study was to improve the fertilizing capacity of male gametes of low-fertility bulls using EVs isolated by ultracentrifugation from the seminal plasma of a bull of proven fertility. After dose-response curve, 10×106 sperm of low-fertility bulls were co-incubated for an hour with 400×106 EVs/ml. In addition, it has been verified that the incorporation of EVs, which takes place in the sperm midpiece, is maintained for 5 hours and even after cryopreservation. Subsequently, the spermatozoa of low-fertility bulls, with EVs incorporated, were used for the in vitro production of embryos. The rate of blastocyst at seventh day yield in vitro, with the use of sperm with EVs incorporated, increased by about twice the yield obtained with the same sperm in the absence of EVs: bulls having an average embryonic yield of 6.41±1.48%, 10.32±4.34% and 10.92±0.95% improved their yield to 21.21±1.99%, 22.17±6.09% and 19.99±5.78%, respectively (P<0.05). These encouraging results suggest that it might be possible to keep breeding bulls with poor fertility. Further studies will be needed to evaluate the in vivo fertility of sperm treated with EVs and understand how the content of EVs is involve in the sperm-vesicle interaction and in the improved sperm performance.

 

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