Vero cells stimulate human sperm motility in vitro

Area of Science:

• Reproductive Biology
• Cell Biology
• In Vitro Fertilization

Background:

• Human sperm motility is crucial for natural conception and successful assisted reproductive technologies (ART).
• Optimizing sperm function in vitro is essential for improving ART outcomes.
• Coculture systems offer a potential method to enhance sperm parameters ex vivo.

Purpose of the Study:

• To investigate the impact of coculture systems on human sperm viability and motility.
• To evaluate the efficacy of different coculture conditions, including Vero cells and conditioned media, on sperm function.
• To assess the influence of patient-derived sera on sperm motility in a coculture setting.

Main Methods:

• Human spermatozoa were incubated in various media: M199/FCS with Vero cells, Vero cell-conditioned M199/FCS, Vero cell extract, and control media.
• Sperm motility (percentage and curvilinear velocity) was assessed using a computerized motility-analyzing system after 24-hour incubation.
• Sperm viability was determined via eosin Y staining; patient sera replaced FCS in a secondary experiment.

Main Results:

• Sperm viability remained consistent across all tested media.
• Significant improvements in sperm motility parameters (percentage and velocity) were observed in coculture, Vero cell-conditioned medium, and with human sera compared to controls (P < 0.005).
• Vero cell extract did not demonstrate a positive effect on sperm motility.

Conclusions:

• Coculture systems, particularly those involving Vero cells and conditioned media, positively influence human sperm motility.
• These findings suggest that coculture techniques could be beneficial for improving the success rates of in vitro fertilization (IVF), intrauterine insemination (IUI), and artificial insemination (AI).
• Further research into optimizing coculture conditions may enhance sperm function for ART applications.