The miR-148/152 Family Suppresses Apoptosis and Necroptosis for Cancer Evasion Through Direct RIPK1 Repression

Area of Science:

• Molecular Biology
• Cancer Biology
• Biochemistry

Background:

• Evasion of programmed cell death (apoptosis and necroptosis) is a key cancer hallmark driving tumorigenesis and chemoresistance.
• MicroRNAs (miRNAs) regulate cell death, but specific families' roles in coordinated death resistance are unclear.
• The miR-148/152 family was identified as a potent suppressor of tumor necrosis factor (TNF)-induced cell death.

Purpose of the Study:

• Investigate the miR-148/152 family's mechanism in regulating apoptosis and necroptosis.
• Determine the oncogenic role of this miRNA family in cancer.
• Explore its potential as a therapeutic target for overcoming cancer cell death evasion.

Main Methods:

• Functional screening to identify miRNA regulators of cell death.
• Ectopic expression of miR-148a and miR-152 in human cancer cell lines.
• Analysis of cell death markers (caspase-8, caspase-3, RIPK1, RIPK3) and gene expression.
• 3'UTR target validation for RIPK1.
• Assessment of cancer cell proliferation, colony formation, and chemoresistance.

Main Results:

• The miR-148/152 family inhibits TNF-induced apoptosis and necroptosis by downregulating RIPK1, RIPK3, caspase-8, and caspase-3.
• miR-152 enhances cancer cell proliferation and colony formation.
• High miR-152 expression correlates with poor prognosis in gastric cancer.
• This miRNA confers resistance to cisplatin-induced, RIPK1-mediated cell death, promoting gastric cancer survival.

Conclusions:

• The miR-148/152 family acts as an oncogenic driver by suppressing RIPK1, promoting cancer cell survival and chemoresistance.
• Targeting the miR-148/152 family could be a therapeutic strategy to overcome cell death evasion in cancer.
• This miRNA family plays a critical role in regulating programmed cell death and cancer progression.