ORAI3 contributes to hypoxia-inducible factor 1/2α-sensitive colon cell migration

Area of Science:

• Oncology
• Molecular Biology
• Cell Biology

Background:

• Hypoxia is a critical factor in tumor development, promoting angiogenesis and growth via hypoxia-inducible factors (HIFs).
• The roles of HIF-1α and HIF-2α in colon cancer progression and their relationship with ORAI3 remain to be fully elucidated.

Purpose of the Study:

• To investigate the involvement of HIF-1α and HIF-2α in colon cancer.
• To determine the role of ORAI3 in the HIF-mediated pathway in colon cancer.

Main Methods:

• Analysis of ORAI1/3 and HIF-1/2α levels in patient and murine colon cancer models.
• Calcium imaging to assess store-operated calcium entry (SOCE) activity.
• Scratch assays to evaluate cell migration capacity and colony-forming potential.

Main Results:

• Elevated ORAI1/3 and HIF-1/2α levels were observed in colon cancer tissues and under hypoxic conditions.
• HIF-1/2α silencing reduced SOCE, while overexpression enhanced it.
• HIF-1/2α regulated ORAI3 expression, and ORAI3 knockdown impaired cell migration and colony formation.

Conclusions:

• HIF-1α and HIF-2α directly facilitate ORAI3 expression in colon cancer.
• ORAI3 plays a significant role in mediating the pro-tumorigenic effects of HIFs, impacting cell migration and proliferation.