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ZD7288 inhibits low-threshold Ca(2+) channel activity and regulates sperm function.
Ricardo Felix1, Alejandro Sandoval, Daniel Sánchez
1Department of Physiology, Biophysics and Neuroscience, Cinvestav-IPN, Mexico City, Mexico.
Biochemical and Biophysical Research Communications
|October 25, 2003
Summary
ZD7288 inhibits the mouse sperm acrosome reaction by blocking T-type calcium channels. This study provides new evidence for the role of these channels in sperm function.
Area of Science:
- Spermatology
- Ion Channel Physiology
- Reproductive Biology
Background:
- Hyperpolarization-activated and cyclic nucleotide-gated (HCN) channels are implicated in various physiological processes.
- Low-threshold (T-type) Ca(2+) channels are known to play a role in mouse sperm acrosome reaction (AR).
Purpose of the Study:
- To investigate the effect of ZD7288, an HCN channel blocker, on the mouse sperm acrosome reaction (AR).
- To determine if ZD7288 affects T-type Ca(2+) currents in mouse spermatogenic cells and cloned ion channels.
Main Methods:
- Electrophysiological recordings of native T-type Ca(2+) currents in mouse spermatogenic cells.
- Heterologous expression of cloned T-type and N-type Ca(2+) channels in HEK-293 cells.
- Assessment of ZD7288's inhibitory effects on these channels and the mouse sperm AR.
Main Results:
- ZD7288 was found to inhibit the mouse sperm acrosome reaction (AR).
- ZD7288 effectively blocked native T-type Ca(2+) currents in mouse spermatogenic cells (IC(50) ≈ 100 μM).
- ZD7288 inhibited all cloned T-type Ca(2+) channels but not N-type channels expressed in HEK-293 cells.
Conclusions:
- The findings support a significant role for T-type Ca(2+) channels in the mouse sperm acrosome reaction.
- ZD7288's inhibitory action on sperm AR is likely mediated through its blockade of T-type Ca(2+) channels.