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Store-independent activation of Orai1 by SPCA2 in mammary tumors

Mingye Feng1, Desma M Grice, Helen M Faddy

  • 1Department of Physiology, School of Medicine, The Johns Hopkins University, Baltimore, MD 21205, USA.

Cell
|October 5, 2010
PubMed

Insights

Secretory Pathway Ca(2+)-ATPase 2 (SPCA2) upregulation promotes breast cancer by increasing calcium influx via Orai1. Suppressing SPCA2 reduces calcium levels and tumor growth, revealing a novel tumorigenesis pathway.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Cancer Research

Background:

  • Calcium ions (Ca2+) are vital second messengers regulating cellular processes.
  • Altered cytosolic Ca2+ dynamics are implicated in tumorigenesis, affecting motility, proliferation, and apoptosis.

Purpose of the Study:

  • To investigate the role of Secretory Pathway Ca2+-ATPase 2 (SPCA2) in breast cancer.
  • To elucidate the mechanism by which SPCA2 influences calcium signaling and tumorigenicity.

Main Methods:

  • Analysis of SPCA2 expression in breast cancer cells and tumors.
  • Functional assays to assess the impact of SPCA2 suppression on Ca2+ levels and tumorigenicity.
  • Investigation of the interaction between SPCA2 and the store-operated Ca2+ channel Orai1.

Main Results:

  • SPCA2 is upregulated in breast cancer cells and tumors.
  • SPCA2 suppression decreases basal Ca2+ levels and attenuates tumorigenicity.
  • SPCA2 enhances Ca2+ influx through Orai1, independent of ER Ca2+ stores and STIM proteins.
  • SPCA2 N-terminus binding to Orai1 activates Ca2+ influx.

Conclusions:

  • SPCA2-Orai1 complex forms a novel signaling pathway promoting tumorigenesis.
  • This pathway involves constitutive, store-independent Ca2+ signaling.
  • Targeting the SPCA2-Orai1 interaction may offer a therapeutic strategy for breast cancer.

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