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STIM-Orai Channels and Reactive Oxygen Species in the Tumor Microenvironment

1
Department of Biophysics, Center for Integrative Physiology and Molecular Medicine, Medical Faculty, Saarland University, 66421 Homburg, Germany
2
Center for Human and Molecular Biology, Saarland University, 66421 Homburg, Germany
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Cancers 2019, 11(4), 457; https://doi.org/10.3390/cancers11040457
Received: 22 February 2019 / Revised: 22 March 2019 / Accepted: 27 March 2019 / Published: 30 March 2019
(This article belongs to the Special Issue Ion Channels in Cancer)
The tumor microenvironment (TME) is shaped by cancer and noncancerous cells, the extracellular matrix, soluble factors, and blood vessels. Interactions between the cells, matrix, soluble factors, and blood vessels generate this complex heterogeneous microenvironment. The TME may be metabolically beneficial or unbeneficial for tumor growth, it may favor or not favor a productive immune response against tumor cells, or it may even favor conditions suited to hijacking the immune system for benefitting tumor growth. Soluble factors relevant for TME include oxygen, reactive oxygen species (ROS), ATP, Ca2+, H+, growth factors, or cytokines. Ca2+ plays a prominent role in the TME because its concentration is directly linked to cancer cell proliferation, apoptosis, or migration but also to immune cell function. Stromal-interaction molecules (STIM)-activated Orai channels are major Ca2+ entry channels in cancer cells and immune cells, they are upregulated in many tumors, and they are strongly regulated by ROS. Thus, STIM and Orai are interesting candidates to regulate cancer cell fate in the TME. In this review, we summarize the current knowledge about the function of ROS and STIM/Orai in cancer cells; discuss their interdependencies; and propose new hypotheses how TME, ROS, and Orai channels influence each other. View Full-Text
Keywords: Orai; STIM; calcium; reactive oxygen species; H2O2; tumor microenvironment Orai; STIM; calcium; reactive oxygen species; H2O2; tumor microenvironment
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MDPI and ACS Style

Frisch, J.; Angenendt, A.; Hoth, M.; Prates Roma, L.; Lis, A. STIM-Orai Channels and Reactive Oxygen Species in the Tumor Microenvironment. Cancers 2019, 11, 457.

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