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Identification of State-Dependent Blockers for Voltage-Gated Calcium Channels Using a FLIPR-Based Assay

  • Alberto di Silvio
  • JeanFrancois Rolland
  • Michela StucchiEmail author
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 1439)

Abstract

The FLIPR (Fluorescent Imaging Plate Reader) system has been extensively used in the early stages of drug discovery for the identification of small molecules as a starting point for drug development, and for the pharmacological characterization of compounds. The main application of the system has been the measurement of intracellular Ca2+ signals using fluorescent calcium indicators.

This chapter describes the application of a protocol for the study and characterization of state-dependent blockers of Voltage-Gated Calcium Channels (VGCC) on the FLIPRTETRA.

The cell line suitable for the application of the protocol, and described hereafter, co-expresses the human CaV1.2 channel and the human inward rectifier K+ channel Kir2.3. The presence of Kir2.3 allows the modulation of the plasma membrane potential and consequently of the state of the CaV1.2 channel by changing the extracellular K+ concentration. In this way, CaV1.2 activity can be measured at different membrane voltages, corresponding to either the resting or partial inactivated state, by loading the cells with a calcium probe in extracellular low or high potassium buffer.

Key words

State-dependent blockers Voltage-gated calcium channel Calcium fluorescent dye FLIPR 

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Alberto di Silvio
    • 1
  • JeanFrancois Rolland
    • 1
  • Michela Stucchi
    • 1
    Email author
  1. 1.Screening Technologies UnitAXXAM SpABresso (Milan)Italy

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