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Influence of pentoxifylline on sperm membrane functional integrity
A A Ponce1, M Fiol de Cuneo, R D Ruiz
1Instituto de Fisiológia, Facultad de Ciencias Médicas, Universidad Nacional de Córdoba, República Argentina. aponce@altavista.net
Abstract:
In epididymal mouse spermatozoa, the effects of dibutyryl cyclic adenosine monophosphate 1 mmol/L (dbcAMP), pentoxifylline 5 mmol/L (PX), and/or mastoparan 50 mumol/L (MT) were evaluated for the following parameters: percentage of motile cells and response to hypoosmotic shock (HOS). The gametes were incubated during 80 min (A) or 200 min (B) in Tyrode's medium, and the drugs were added during the last 20 min. In A, dbcAMP + PX (61.5 +/- 5.4%; n = 10) enhanced and MT decreased significantly the population of motile cells (13.4 +/- 5.4%; n = 6) (control: 47.6 +/- 3.9%; n = 11). In B, PX significantly increased this parameter and MT plus PX also exerted a significant detrimental effect. Responses to HOS dropped significantly in the presence of PX + MT in A or in B; in this latter condition a similar decrease was evoked by MT alone. A positive correlation between percentages of swollen and motile spermatozoa was detected in A or in B in samples incubated with PX (r = .58, n = 11 and r = .76, n = 10; p < .05, respectively). These results that support that, in mouse sperm tail, PX would preserve functional membrane integrity, a relevant condition for adequate motility.
Insights
Pentoxifylline (PX) enhances mouse sperm motility and preserves membrane integrity, while mastoparan (MT) negatively impacts sperm function. These findings are crucial for understanding sperm physiology and potential fertility treatments.
Area of Science:
- Reproductive Biology
- Sperm Physiology
- Biochemistry
Background:
- Sperm motility and function are critical for fertilization.
- Chemical agents can modulate sperm parameters.
- Understanding the effects of specific compounds on sperm is essential for reproductive research.
Purpose of the Study:
- To investigate the effects of dibutyryl cyclic adenosine monophosphate (dbcAMP), pentoxifylline (PX), and mastoparan (MT) on mouse sperm motility and hypoosmotic shock (HOS) response.
- To determine the impact of incubation time and drug combinations on sperm parameters.
Main Methods:
- Epididymal mouse spermatozoa were incubated in Tyrode's medium.
- Sperm were treated with dbcAMP, PX, and/or MT for the final 20 minutes of incubation (80 min or 200 min).
- Percentage of motile cells and HOS response were evaluated.
Main Results:
- PX, alone or with dbcAMP, significantly enhanced sperm motility.
- MT significantly decreased sperm motility.
- PX and MT combination, or MT alone, significantly reduced HOS response.
- PX showed a positive correlation with sperm swelling and motility, suggesting preserved membrane integrity.
Conclusions:
- Pentoxifylline (PX) appears to preserve functional membrane integrity in mouse sperm, contributing to enhanced motility.
- Mastoparan (MT) has detrimental effects on sperm motility and membrane function.
- Combinations of PX and MT negatively impact sperm viability and function.