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  • Title: [17 beta-estradiol inhibits T-type calcium channels in mouse spermatogenic cells].
    Author: Lu L, Wang CS, Gao XH, Wang J, Cheng J, Gao R, Xiao H.
    Journal: Zhonghua Nan Ke Xue; 2008 Jun; 14(6):483-8. PubMed ID: 18649742.
    Abstract:
    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.
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