Sperm motility modulated by Trpv1 regulates zebrafish fertilization

Area of Science:

• Reproductive Biology
• Ion Channel Physiology
• Zebrafish Model Organism

Background:

• Ion channels are crucial for sperm function, responding to environmental and intracellular cues.
• Limited knowledge exists regarding ion channels in zebrafish sperm, impacting male reproductive physiology understanding.

Purpose of the Study:

• Investigate the role of ion channels, specifically Transient Receptor Potential Vanilloid channel 1 (Trpv1), in zebrafish sperm function.
• Determine Trpv1's impact on sperm motility, in vitro fertilization, and its localization in zebrafish sperm.

Main Methods:

• Utilized general calcium and potassium channel blockers to assess effects on sperm motility.
• Employed Trpv1 antagonist and agonist, alongside Western blot and immunofluorescence, to study Trpv1 function and localization.
• Examined sperm motility in trpv1 knockout zebrafish.

Main Results:

• General calcium channel blockers, but not potassium channel blockers, suppressed zebrafish sperm motility.
• Trpv1 antagonist inhibited sperm motility and in vitro fertilization, while the agonist restored motility.
• Trpv1 was localized to the neck and tail regions of zebrafish sperm.
• Trpv1 manipulation had no effect on trpv1 knockout sperm motility.

Conclusions:

• Trpv1 is functionally present in zebrafish sperm and plays a significant role in regulating motility and fertilization.
• Findings provide insights into zebrafish male reproductive physiology and identify Trpv1 as a potential target for fish breeding and sperm cryopreservation.