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Related Concept Videos

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ORAI1α and ORAI1β have differential sensitivity to extracellular pH.

Mélanie Robitaille1, Michael H McCullough2, Choon Leng So1

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Extracellular pH changes affect calcium influx through ORAI1 channels. This study shows ORAI1α variants sustain calcium influx more than ORAI1β variants at acidic pH, impacting cancer progression.

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Area of Science:

  • Cellular Biology
  • Physiology
  • Biochemistry

Background:

  • Extracellular acidification and dysregulated calcium homeostasis are implicated in various pathophysiological states, including cancer.
  • The ORAI1 calcium channel, crucial for Store-Operated Calcium Entry (SOCE), is upregulated in several cancers.
  • ORAI1 exists as α (long) and β (short) variants, with distinct functional roles yet to be fully elucidated.

Purpose of the Study:

  • To investigate the differential effects of extracellular pH on the function of ORAI1α and ORAI1β variants.
  • To quantify pH-dependent calcium influx mediated by ORAI1 variants using a mathematical model.
  • To identify potential domains within ORAI1α responsible for pH-dependent activation.

Main Methods:

  • Cell-based calcium flux assays were employed to measure calcium influx.
  • A mathematical model of intracellular calcium dynamics incorporating SOCE was developed and fitted to experimental data.
  • Site-directed mutagenesis of the ORAI1α N-terminus was performed to probe functional domains.

Main Results:

  • At extracellular pH 6.8, ORAI1α facilitated more sustained calcium influx compared to ORAI1β.
  • The mathematical model successfully quantified variations in pH-dependent calcium influx.
  • Specific point mutations in the ORAI1α N-terminus indicated key domains involved in pH-mediated differential activation.

Conclusions:

  • ORAI1α and ORAI1β variants exhibit distinct sensitivities to extracellular pH changes, particularly at acidic conditions relevant to pathophysiological states.
  • These findings highlight the differential roles of ORAI1 variants in regulating calcium homeostasis under altered pH.
  • Understanding these pH-dependent mechanisms may offer novel therapeutic strategies for cancers associated with ORAI1 upregulation.