Role of the sodium/calcium exchanger type 3 in cancer cells

Area of Science:

• Cell Biology
• Cancer Research
• Molecular Biology

Background:

• The sodium/calcium exchanger (NCX) family, particularly NCX1, is implicated in various cancers.
• Limited understanding exists regarding the roles of NCX2 and NCX3 in cancer progression.

Purpose of the Study:

• To investigate the role of NCX3 in cancer cell apoptosis, migration, proliferation, intracellular calcium, and ATP levels.
• To determine if NCX3 inhibition affects cancer cell bioenergetics.

Main Methods:

• Utilized YM-244769, a selective NCX3 blocker, across four cancer cell lines (DLD1, HeLa, MDA-MB-231, JIMT1).
• Employed CRISPR/Cas9 gene editing to create SLC8A3 (NCX3) knockout clones for verification.
• Assessed apoptosis, migration, proliferation, intracellular calcium, ATP levels, and mitochondrial respiration.

Main Results:

• YM-244769 treatment led to a dose-dependent increase in apoptosis and decreased migration and proliferation in all tested cancer cell lines.
• NCX3 inhibition effects were consistent regardless of hypoxic conditions.
• CRISPR/Cas9-mediated NCX3 knockout yielded similar results to pharmacological inhibition, confirming NCX3's role.
• Mitochondrial respiration was impaired in NCX3 knockout cells.

Conclusions:

• NCX3 significantly promotes cancer cell survival by supporting anti-apoptotic, pro-migratory, and proliferative functions.
• NCX3 influences cancer cell fate through its role in mitochondrial bioenergetics.