Fluorescence-Based Ratiometric Measurement of CRAC Channel Activity in STIM-Orai-Overexpressing HEK-293 Cells. Chapter uri icon


  • Calcium influx through store-operated Ca2+ entry (SOCE), mediated by STIM-operated Orai channels, is crucial for many cellular functions. To dissect the molecular mechanisms underlying the process of STIM-Orai activation and identify regulators that modify this process, ratiometric imaging of SOCE responses in HEK cells overexpressing STIM and Orai is a routinely used method. Here we describe one commonly used procedure of monitoring SOCE activity with a ratiometric membrane-permeable dye fura-2-AM. Other ratiometric indicators suitable for SOCE measurements are also discussed.

author list (cited authors)

  • Zhang, S., He, L., Zhou, Y., & Wang, Y.

citation count

  • 1

complete list of authors

  • Zhang, Shuce||He, Lian||Zhou, Yubin||Wang, Youjun

Book Title

  • The CRAC Channel

publication date

  • September 2018