Prolyl Endopeptidase (PREP) is Associated With Male Reproductive Functions and Gamete Physiology in Mice.
Prolyl endopeptidase (PREP) is a serine protease which has been implicated in many biological processes, such as the maturation and degradation of peptide hormones and neuropeptides, learning and memory, cell proliferation and differentiation, and glucose metabolism. A small number of reports have also suggested PREP participation in both male and female reproduction-associated processes. In the present work, we examined PREP distribution in male germ cells and studied the effects of its knockdown (Prep(gt/gt)) on testis and sperm in adult mice. The protein is expressed and localized in elongating spermatids and luminal spermatozoa of wild type (wt) mice, as well as Sertoli, Leydig, and peritubular cells. PREP is also expressed in the head and midpiece of epididymal spermatozoa, whereas the remaining tail region shows a weaker signal. Furthermore, testis weight, histology of seminiferous tubules, and epididymal sperm parameters were assessed in wt and Prep(gt/gt) mice: wild type testes have larger average tubule and lumen diameter; in addition, lumenal composition of seminiferous tubules is dissimilar between wt and Prep(gt/gt), as the percentage of spermiated tubules is much higher in wt. Finally, total sperm count, sperm motility, and normal morphology are also higher in wt than in Prep(gt/gt). These results show for the first time that the expression of PREP could be necessary for a correct reproductive function, and suggest that the enzyme may play a role in mouse spermatogenesis and sperm physiology.
Dipartimento di Medicina Sperimentale, Sez. Fisiologia Umana e Funzioni Biologiche Integrate "F. Bottazzi", Seconda Università di Napoli, Napoli, Italy.|Departments of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, Yale University, New Haven, Connecticut.
Raffaele
R
Dotolo
Departments of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, Yale University, New Haven, Connecticut.
Jung Dae
JD
Kim
Dipartimento di Medicina Sperimentale, Sez. Fisiologia Umana e Funzioni Biologiche Integrate "F. Bottazzi", Seconda Università di Napoli, Napoli, Italy.
Paolo
P
Pariante
Dipartimento di Medicina Sperimentale, Sez. Fisiologia Umana e Funzioni Biologiche Integrate "F. Bottazzi", Seconda Università di Napoli, Napoli, Italy.
Sergio
S
Minucci
Departments of Obstetrics, Gynecology and Reproductive Sciences, School of Medicine, Yale University, New Haven, Connecticut.
Sabrina
S
Diano
D000818:Animals; D004822:Epididymis / Q000378:metabolism*; D008297:Male; D008810:Mice, Inbred C57BL; D000085822:Prolyl Oligopeptidases; D012098:Reproduction; D012697:Serine Endopeptidases / Q000378:metabolism*; D013076:Sperm Count / Q000379:methods; D013081:Sperm Motility / Q000502:physiology*; D013091:Spermatogenesis / Q000502:physiology*; D013094:Spermatozoa / Q000166:cytology / Q000201:enzymology*; D013737:Testis / Q000166:cytology* / Q000201:enzymology*
D012697:Serine Endopeptidases; D000085822:Prolyl Oligopeptidases