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[17 beta-estradiol inhibits T-type calcium channels in mouse spermatogenic cells]
Liang Lu1, Chang-song Wang, Xiao-hua Gao
1The Ministry of Education Key Lab of Modern Toxicology, Nanjing Medical University, Nanjing, Jiangsu 210029, China.
Objective:
To investigate the effect of 17 beta-estradiol (E2) on T-type calcium currents (ICaT) in spermatogenic cells.
Methods:
Ca2+ currents were obtained in acutely dissociated mouse spermatogenic cells by the whole-cell patch clamp technique and the effects of E2 on ICaT were observed.
Results:
E2 at the concentrations of 1, 10 and 100 micromol/L significantly inhibited ICaT in the mouse spermatogenic cells, with the KC50 value of 8.89 micromol/L and the inhibition rates of (13.48 +/- 1.86) %, (28.98 +/- 2.70) and (52.93 +/- 3.42)%, respectively (n = 6, P < 0.05). E2 of 100 micromol/L significantly changed the activation and inactivation of ICaT: the half activation potential (Va 1/2) and the activation steepness factor (Ka) from ( -48.94 +/- 0.22) mV and (5.19 +/- 0.19) mV to (-54.34 +/- 1.02) mV and (6.02 +/- 0.84) mV ( n = 5, P < 0.05) , and the half inactivation potential (Vi 1/2) and the inactivation steepness factor (Ki) from (-56.51 +/- 0.13) mV and (3.36 +/- 0.11) mV to (-61.78 +/- 0.50) mV and (4.25 +/- 0.37) mV, respectively (n = 5, P < 0.05).
Conclusion:
E2 has a significant inhibitory effect on ICaT in mouse spermatogenic cells in a con-centration-dependent manner.
Insights
17 beta-estradiol (E2) significantly inhibits T-type calcium currents (ICaT) in mouse spermatogenic cells. This effect is concentration-dependent, impacting cell function and calcium signaling pathways.
Area of Science:
- Reproductive biology
- Cell physiology
- Endocrinology
Context:
- Spermatogenic cells are crucial for male fertility.
- Calcium signaling plays a vital role in sperm function.
- 17 beta-estradiol (E2) is a key sex hormone with known effects on reproductive tissues.
Purpose:
- To investigate the direct impact of 17 beta-estradiol (E2) on T-type calcium currents (ICaT).
- To quantify the inhibitory effects of E2 on ICaT in mouse spermatogenic cells.
- To determine the concentration-dependent relationship of E2's effect on ICaT.
Summary:
- 17 beta-estradiol (E2) was applied to mouse spermatogenic cells using whole-cell patch clamp techniques.
- E2 significantly inhibited T-type calcium currents (ICaT) in a concentration-dependent manner.
- E2 altered the activation and inactivation properties of ICaT, with significant shifts in half-activation and half-inactivation potentials.
Impact:
- Provides novel insights into the molecular mechanisms by which E2 influences male reproductive cell function.
- Highlights the role of E2 in regulating calcium ion influx in spermatogenic cells.
- Suggests potential implications for understanding E2-related effects on male fertility and reproductive health.
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