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Related Experiment Videos

Divalent metals differentially block cloned T-type calcium channels.

Seong-Woo Jeong1, Byong-Gon Park, Jin-Yong Park

  • 1Department of Physiology, Yonsei University, Wonju College of Medicine, Ilsan-Dong 162, Wonju, Kangwon-Do, Seoul, Korea.

Neuroreport
|September 10, 2003
PubMed
Summary

Copper (Cu2+) and Zinc (Zn2+) effectively block T-type calcium channels, particularly the alpha1H subtype. These divalent metals show promise as selective pharmacological tools for studying these crucial ion channels.

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Area of Science:

  • Pharmacology
  • Neuroscience
  • Ion Channel Physiology

Background:

  • T-type calcium channels are crucial for neuronal function and are implicated in various physiological and pathological processes.
  • Selective blockers are essential tools for dissecting the specific roles of different calcium channel subtypes.

Purpose of the Study:

  • To investigate the pharmacological profiles of divalent metals (Cu2+, Pb2+, Zn2+) as blockers of cloned T-type calcium channel isoforms (alpha1G, alpha1H, alpha1I).
  • To evaluate the selectivity of these metal ions for native T-type calcium channels over high voltage-activated calcium channels in rat sympathetic pelvic neurons.

Main Methods:

  • Electrophysiological recordings were used to assess the blockade of cloned T-type calcium channel isoforms (alpha1G, alpha1H, alpha1I) by Cu2+, Pb2+, and Zn2+.

Related Experiment Videos

  • The effects of these metals on native low and high voltage-activated calcium channels in rat sympathetic pelvic neurons were also evaluated.

    • Main Results:

    • Cu2+ and Zn2+ demonstrated concentration-dependent blockade of all three T-type channel isoforms, with higher affinity for alpha1H currents (IC50 = 0.9 microM for Cu2+, 2.3 microM for Zn2+).
    • In pelvic neurons, Zn2+ exhibited strong selectivity for T-type calcium currents over high voltage-activated currents.
    • Pb2+ did not display distinctive selectivity in blocking calcium channels.

    Conclusions:

    • Cu2+ and Zn2+ can serve as selective blockers for alpha1H T-type calcium channels at low concentrations, similar to Ni2+.
    • These findings provide valuable pharmacological tools for further research into the specific functions of T-type calcium channels, particularly the alpha1H isoform.