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JOURNAL ARTICLE
REVIEW
Regulation of Endoplasmic Reticulum-Mitochondria Ca(2+) Transfer and Its Importance for Anti-Cancer Therapies.
Inter-organelle membrane contact sites are emerging as major sites for the regulation of intracellular Ca(2+) concentration and distribution. Here, extracellular stimuli operate on a wide array of channels, pumps, and ion exchangers to redistribute intracellular Ca(2+) among several compartments. The resulting highly defined spatial and temporal patterns of Ca(2+) movement can be used to elicit specific cellular responses, including cell proliferation, migration, or death. Plasma membrane (PM) also can directly contact mitochondria and endoplasmic reticulum (ER) through caveolae, small invaginations of the PM that ensure inter-organelle contacts, and can contribute to the regulation of numerous cellular functions through scaffolding proteins such as caveolins. PM and ER organize specialized junctions. Here, many components of the receptor-dependent Ca(2+) signals are clustered, including the ORAI1-stromal interaction molecule 1 complex. This complex constitutes a primary mechanism for Ca(2+) entry into non-excitable cells, modulated by intracellular Ca(2+). Several contact sites between the ER and mitochondria, termed mitochondria-associated membranes, show a very complex and specialized structure and host a wide number of proteins that regulate Ca(2+) transfer. In this review, we summarize current knowledge of the particular action of several oncogenes and tumor suppressors at these specialized check points and analyze anti-cancer therapies that specifically target Ca(2+) flow at the inter-organelle contacts to alter the metabolism and fate of the cancer cell.
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