Effects of pentoxifylline treatment before freezing on motility, viability and acrosome status of poor quality human spermatozoa cryopreserved by the liquid nitrogen vapor method
Braz. j. med. biol. res
;
40(7): 985-992, July 2007. tab, graf
Artigo
em Inglês
| LILACS
| ID: lil-455992
ABSTRACT
The objective of the present study was to investigate the effects of the direct addition of pentoxifylline (PF) to the ejaculates of men with poor sperm quality before freezing on post-thaw sperm motility, viability, acrosome integrity, and agonist-induced acrosome reaction. Semen specimens from 16 infertile men with impaired sperm count and motility (oligoasthenozoospermia) were divided into two equal aliquots one received no treatment (control) while the other was incubated with 5 mM PF (treated). Both aliquots were cryopreserved by the liquid nitrogen vapor method. Motility was assessed according to WHO criteria. Acrosome integrity and spontaneous and calcium ionophore-induced acrosome reactions were assessed with fluorescein isothiocyanate-conjugated peanut agglutinin combined with a supra-vital dye (Hoechst-33258). Cryopreservation impaired sperm motility (percentage reduction 87.4 (interquartile range, IQ 70.3-92.9) vs 89.1 (IQ 72.7-96.0 percent)), viability (25.9 (IQ 22.2-29.7) vs 25.6 (IQ 19.7-40.3 percent)) and acrosome integrity (18.9 (IQ 5.4-38.9) vs 26.8 (IQ 0.0-45.2 percent)) to the same extent in both treated and control aliquots. However, PF treatment before freezing improved the acrosome reaction to ionophore challenge test scores in cryopreserved spermatozoa (9.7 (IQ 6.6-19.7) vs 4.8 (IQ 0.5-6.8 percent); P = 0.002). These data show that pre-freeze treatment of poor quality human sperm with pentoxifylline did not improve post-thaw motility or viability nor did it prevent acrosomal loss during the freeze-thaw process. However, PF, as used, improved the ability of thawed spermatozoa to undergo the acrosome reaction in response to calcium ionophore. The present data indicate that treatment of poor quality human sperm with PF may enhance post-thaw sperm fertilizing ability.
Texto completo:
DisponíveL
Índice:
LILACS (Américas)
Assunto principal:
Pentoxifilina
/
Inibidores de Fosfodiesterase
/
Motilidade dos Espermatozoides
/
Espermatozoides
/
Reação Acrossômica
Tipo de estudo:
Estudo observacional
Limite:
Humanos
/
Masculino
Idioma:
Inglês
Revista:
Braz. j. med. biol. res
Assunto da revista:
Biologia
/
Medicina
Ano de publicação:
2007
Tipo de documento:
Artigo
País de afiliação:
Brasil
Instituição/País de afiliação:
Universidade Federal de São Paulo/BR
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