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Abstract:

Numerous studies have demonstrated that sperm capacitation is a bicarbonate-dependent process. In the rat, capacitation has not been studied as much as in other species, mainly because of the difficulties in carrying out functional assays with this animal model. In the present study, we have examined the influence of bicarbonate in the overall rat sperm capacitation process by analyzing involvement of the anion in 1) protein tyrosine phosphorylation, 2) migration of epididymal protein DE (also known as CRISP-1) from the dorsal region to the equatorial segment of the sperm head that occurs during capacitation, and 3) ability of sperm to fuse with the egg. Incubation of sperm under capacitating conditions produced a time-dependent increase in protein tyrosine phosphorylation. This phosphorylation did not occur in the absence of HCO3- and rapidly increased by either exposure of sperm to HCO3- or replacement of the anion by a cAMP analog (dibutyryl-cAMP) and a phosphodiesterase inhibitor (pentoxifylline). The absence of HCO3- also produced a significant decrease in the percentage of cells showing migration of DE to the equatorial segment. This parameter was completely restored by addition of the anion, but dibutyryl-cAMP and pentoxifylline were not sufficient to overcome the decrease in DE migration. Sperm capacitated in the absence of HCO3- were unable to penetrate zona-free eggs independent of the presence of the anion during gamete coincubation. Exposure of these sperm to bicarbonate, or replacement of the anion by dibutyryl-cAMP and pentoxifylline, only partially restored the sperm fusion ability. Altogether, these results indicate that, in addition to its influence on protein tyrosine phosphorylation, bicarbonate is required to support other rat sperm capacitation-associated events, such as migration of DE to the equatorial segment, and expression of the ability of sperm to fuse with the egg.

Registro:

Documento: Artículo
Título:Bicarbonate Is Required for Migration of Sperm Epididymal Protein DE (CRISP-1) to the Equatorial Segment and Expression of Rat Sperm Fusion Ability
Autor:Da Ros, V.G.; Munuce, M.J.; Cohen, D.J.; Marín-Briggiler, C.I.; Busso, D.; Visconti, P.E.; Cuasnicú, P.S.
Filiación:Inst. de Biologia y Med. Exp., Buenos Aires 1428, Argentina
Dept. of Vet. and Animal Sciences, University of Massachusetts, Amherst, MA 01003, United States
Inst. de Biologia y Med. Exp., Vuelta de Obligado 2490, Buenos Aires 1428, Argentina
Palabras clave:Epididymis; Fertilization; Gamete biology; Sperm capacitation; anion; bicarbonate; bucladesine; cyclic AMP derivative; epididymal protein de; pentoxifylline; phosphodiesterase inhibitor; protein; unclassified drug; animal cell; article; cell fusion; controlled study; egg; exposure; female; gamete; incubation time; male; nonhuman; parameter; priority journal; protein phosphorylation; rat; sperm; spermatozoon; spermatozoon capacitation; Animals; Bicarbonates; Biological Transport; Female; Male; Membrane Glycoproteins; Phosphorylation; Rats; Rats, Sprague-Dawley; Sperm Capacitation; Sperm-Ovum Interactions; Spermatozoa; Tyrosine; Animalia
Año:2004
Volumen:70
Número:5
Página de inicio:1325
Página de fin:1332
DOI: http://dx.doi.org/10.1095/biolreprod.103.022822
Título revista:Biology of Reproduction
Título revista abreviado:Biol. Reprod.
ISSN:00063363
CODEN:BIREB
CAS:bicarbonate, 144-55-8, 71-52-3; bucladesine, 16980-89-5, 362-74-3; pentoxifylline, 6493-05-6; protein, 67254-75-5; Aeg1 protein, rat; Bicarbonates; Membrane Glycoproteins; Tyrosine, 55520-40-6
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00063363_v70_n5_p1325_DaRos

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Citas:

---------- APA ----------
Da Ros, V.G., Munuce, M.J., Cohen, D.J., Marín-Briggiler, C.I., Busso, D., Visconti, P.E. & Cuasnicú, P.S. (2004) . Bicarbonate Is Required for Migration of Sperm Epididymal Protein DE (CRISP-1) to the Equatorial Segment and Expression of Rat Sperm Fusion Ability. Biology of Reproduction, 70(5), 1325-1332.
http://dx.doi.org/10.1095/biolreprod.103.022822
---------- CHICAGO ----------
Da Ros, V.G., Munuce, M.J., Cohen, D.J., Marín-Briggiler, C.I., Busso, D., Visconti, P.E., et al. "Bicarbonate Is Required for Migration of Sperm Epididymal Protein DE (CRISP-1) to the Equatorial Segment and Expression of Rat Sperm Fusion Ability" . Biology of Reproduction 70, no. 5 (2004) : 1325-1332.
http://dx.doi.org/10.1095/biolreprod.103.022822
---------- MLA ----------
Da Ros, V.G., Munuce, M.J., Cohen, D.J., Marín-Briggiler, C.I., Busso, D., Visconti, P.E., et al. "Bicarbonate Is Required for Migration of Sperm Epididymal Protein DE (CRISP-1) to the Equatorial Segment and Expression of Rat Sperm Fusion Ability" . Biology of Reproduction, vol. 70, no. 5, 2004, pp. 1325-1332.
http://dx.doi.org/10.1095/biolreprod.103.022822
---------- VANCOUVER ----------
Da Ros, V.G., Munuce, M.J., Cohen, D.J., Marín-Briggiler, C.I., Busso, D., Visconti, P.E., et al. Bicarbonate Is Required for Migration of Sperm Epididymal Protein DE (CRISP-1) to the Equatorial Segment and Expression of Rat Sperm Fusion Ability. Biol. Reprod. 2004;70(5):1325-1332.
http://dx.doi.org/10.1095/biolreprod.103.022822