Affordable Access

deepdyve-link
Publisher Website

Epididymal α-l-fucosidase and its possible role in remodelling the surface of bull spermatozoa.

Authors
  • Aguilera, Andrea Carolina1
  • Boschin, Veronica2
  • Robina, Inmaculada3
  • Elías-Rodríguez, Pilar3
  • Sosa, Miguel Angel4
  • 1 Laboratorio de Biología y Fisiología Celular "Dr. Franciso Bertini", Instituto de Histología y Embriología - IHEM-CONICET-FCM-UNCuyo, 5500 Mendoza, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina. , (Argentina)
  • 2 Laboratorio de Biología y Fisiología Celular "Dr. Franciso Bertini", Instituto de Histología y Embriología - IHEM-CONICET-FCM-UNCuyo, 5500 Mendoza, Argentina. , (Argentina)
  • 3 Departamento de Química Orgánica, Facultad de Química, Universidad de Sevilla, Spain. , (Spain)
  • 4 Laboratorio de Biología y Fisiología Celular "Dr. Franciso Bertini", Instituto de Histología y Embriología - IHEM-CONICET-FCM-UNCuyo, 5500 Mendoza, Argentina; Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina. Electronic address: [email protected] , (Argentina)
Type
Published Article
Journal
Theriogenology
Publication Date
Dec 01, 2017
Volume
104
Pages
134–141
Identifiers
DOI: 10.1016/j.theriogenology.2017.08.016
PMID: 28843076
Source
Medline
Keywords
License
Unknown

Abstract

The mammalian epididymis provides an appropriate environment for sperm maturation. During the epididymal transit, spermatozoa undergo biochemical and morphological changes that lead to the acquisition of the fertilizing capacity. In this study we analysed the fucosylation status of membrane glycoproteins in the spermatozoa obtained from different regions of the bull epididymis. High amounts of fucose were detected on caput spermatozoa (R.F.I. = 1010 ± 20.35), mostly located in the post-acrosome zone. A significant decrease in the fucose levels was detected toward the cauda (R.F.I. = 540.5 ± 49.93) (P < 0.05). This decrease was in line with the increased activity of α-l-fucosidase in the cauda fluid. In sperm from the cauda, the defucosylation occurred in some proteins, whereas others showed higher fucosylation rates. A significant decrease of fucose in the gametes was observed upon incubation of crude cauda fluid with caput spermatozoa (from R.F.I. = 1.45 ± 0.08 to 1.06 ± 0.03) (P < 0.05) indicating that the α-l-fucosidase present in the epididymal fluid is active on spermatozoa. Moreover, this effect was blocked with specific enzyme inhibitors. These results provide direct evidence that the α-l-fucosidase from epididymal fluid participates in the fucose removal from spermatozoa, as a step of sperm maturation in the bull epididymis.

Report this publication

Statistics

Seen <100 times