| Autor: |
Xiong, Zhigang, Bolzon, Bradley J., Cheung, Donald W. |
| Zdroj: |
Pflügers Archiv European Journal of Physiology; June 1993, Vol. 423 Issue: 5-6 p504-510, 7p |
| Abstrakt: |
The effect of neuropeptide Y (NPY) on Ca2+- channel currents in isolated vascular smooth muscle cells was studied with the perforated-patch recording technique. Using Ba2+ (10 mM) as the charge carrier, inward currents sensitive to Cd2+ and nifedipine were potentiated by NPY in a concentration-dependent manner. The threshold concentration for the potentiating effect of NPY was 50 nM and reached a maximum at 150 nM. NPY shifted the steady-state activation curve to less positive membrane potentials by about 6 mV so that the potentiating effect was most prominent near the activation threshold of the current. It had no effect on steady-state inactivation of the current. These results suggest that NPY may potentiate vasoconstriction by promoting calcium entry through L-type voltage-dependent Ca2+-channels. |
| Databáze: |
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