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Journal of Biomolecular Screening
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Automated Patch-Clamp Technique: Increased Throughput in Functional Characterization and in Pharmacological Screening of Small-Conductance Ca2+ Release-Activated Ca2+ Channels

Rikke L. Schrøder

Sophion Bioscience A/S, Ballerup, Denmark

Søren Friis

Sophion Bioscience A/S, Ballerup, Denmark

Morten Sunesen

Sophion Bioscience A/S, Ballerup, Denmark

Chris Mathes

Sophion Bioscience, Inc, North Brunswick, New Jersey, cma{at}sophion.com

Niels J. Willumsen

Department of Biology, University of Copenhagen, Copenhagen, Denmark

The suitability of an automated patch clamp for the characterization and pharmacological screening of calcium release—activated calcium (CRAC) channels endogenously expressed in RBL-2H3 cells was explored with the QPatch system. CRAC currents (I CRAC) are small, and thus precise recordings require high signal-to-noise ratios obtained by high seal resistances. Automated whole-cell establishment resulted in membrane resistances of 1728 ± 226 M{Omega} (n = 44). CRAC channels were activated by a number of methods that raise intracellular calcium concentration, including EGTA, ionomycin, Ins(1,4,5)P3, and thapsigargin. ICRAC whole-cell currents ranged from 30 to 120 pA with rise times of 40 to 150 s. An initial delay in current activation was observed in particular when ICRAC was activated by passive store depletion using EGTA. Apparent rundown of ICRAC was commonly observed, and the current could be reactivated by subsequent addition of thapsigargin. ICRAC was blocked by SKF-96365 and 2-APB with IC50 values of 4.7 ± 1.1 µM (n = 9) and 7.5 ± 0.7 (n = 9) µM, respectively. The potencies of these blockers were similar to values reported for ICRAC in similar conventional patch-clamp experiments. The study demonstrates that CRAC channels can be rapidly and efficiently targeted with automated patch-clamp techniques for characterization of physiological and pharmacological properties. (Journal of Biomolecular Screening 2008:638-647)

Key Words: automated patch clamp • QPatch • intracellular calcium stores • CRAC channels

This version was published on August 1, 2008

Journal of Biomolecular Screening, Vol. 13, No. 7, 638-647 (2008)
DOI: 10.1177/1087057108320274
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