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Fenvalerate modifies T-type Ca2+ channels in mouse spermatogenic cells.
Hang Xiao1, Xi-Chun Zhang, Li Zhang
1Key Laboratory of Reproductive Medicine, Institute of Toxicology, Nanjing Medical University, Nanjing, Jiangsu, 210029, PR China. hxiao@njmu.edu.cn
Reproductive Toxicology (Elmsford, N.Y.)
|July 26, 2005
Summary
Fenvalerate, an insecticide, inhibits sperm's acrosome reaction by blocking T-type calcium channels. This disruption affects sperm function and fertilizing ability, indicating a potential mechanism for pesticide-induced infertility.
Area of Science:
- Reproductive Biology
- Toxicology
- Ion Channel Physiology
Background:
- Sperm acrosome reaction is crucial for fertilization and is initiated by T-type Ca(2+) channels.
- Fenvalerate, a pyrethroid insecticide, has been previously shown to inhibit the mouse acrosome reaction.
Purpose of the Study:
- To investigate the mechanism by which fenvalerate inhibits the acrosome reaction.
- To determine fenvalerate's effect on T-type Ca(2+) channels in mouse sperm.
Main Methods:
- Whole-cell patch clamp technique was used to record T-type Ca(2+) currents in mouse pachytene spermatocytes.
- Concentration-dependent effects of fenvalerate on Ca(2+) currents were analyzed.
Main Results:
- Fenvalerate inhibited T-type Ca(2+) currents in a concentration-dependent manner, with maximal inhibition at 1 microM.
- The inhibitory effect was slow and irreversible.
- Fenvalerate caused a hyperpolarizing shift in activation and inactivation curves, suggesting altered channel gating and ion permeability.
Conclusions:
- Fenvalerate suppresses the acrosome reaction by inhibiting T-type Ca(2+) currents in mouse sperm.
- These findings suggest that T-type Ca(2+) channels are a key target for fenvalerate's effects on sperm function and fertilizing ability.