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A simple end-point assay for calcium channel activity.

Arunkumar Renganathan Chandrika1, Mathew Steephan1, Rajeevkumar Raveendran Nair1

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Cell Calcium
|July 4, 2018
PubMed
Summary

A new method uses the stable CaMKII-GluN2B interaction to detect intracellular calcium. This simple, inexpensive technique enables high-throughput screening for calcium channel drug discovery.

Keywords:
CaMKIICalcium channelCalcium channel assayCalcium imagingCalcium sensingDrug screeningEnd-point measurementNMDA receptorPurinergic receptorTransient receptor potential channels (TRP channels)

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Area of Science:

  • Cellular biology
  • Neuroscience
  • Pharmacology

Background:

  • Cellular calcium signaling is transient, requiring complex real-time methods for observation.
  • Existing methods for calcium sensing are often expensive and require specialized skills, limiting high-throughput applications.
  • Targeting diverse calcium channel subtypes selectively is crucial for effective drug development and minimizing side effects.

Purpose of the Study:

  • To develop a novel, simple, and inexpensive method for intracellular calcium sensing.
  • To create a stable signal for calcium events that does not require real-time imaging.
  • To facilitate high-throughput screening in calcium channel drug discovery.

Main Methods:

  • Utilized the calcium-dependent interaction between CaM kinase II (CaMKII) and its ligand, the NMDA receptor subunit GluN2B.
  • Developed a cell-based assay using GFP-α-CaMKII that translocates upon calcium increase to a GluN2B motif.
  • Created a calcium sensor vector and cell line for detecting intracellular calcium release via a stable punctate fluorescence pattern.

Main Results:

  • The CaMKII-GluN2B complex formation serves as a stable memory of transient calcium increases.
  • Translocation of GFP-α-CaMKII to GluN2B resulted in a detectable punctate fluorescence pattern.
  • Successfully detected activities of heterologously expressed calcium channel proteins in HEK-293 cells with specificity.

Conclusions:

  • The developed technique provides a stable, observable signal for intracellular calcium release without real-time imaging.
  • This novel method is simple, inexpensive, and suitable for high-throughput screening.
  • The calcium sensor vector and cell line offer valuable tools for calcium channel drug discovery.