Multi-omics data integration reveals the molecular network of dysregulation IQGAP2-mTOR promotes cell proliferation

Area of Science:

• Molecular Biology
• Cell Biology
• Oncology

Background:

• IQGAP2 functions as a tumor suppressor gene, impacting cell proliferation across various cancer cell lines.
• The precise regulatory network governing cell proliferation due to IQGAP2 deficiency remains incompletely understood.

Purpose of the Study:

• To elucidate the regulatory network of cell proliferation in response to IQGAP2 deficiency.
• To investigate the molecular mechanisms underlying increased cell proliferation in IQGAP2-deficient cells.

Main Methods:

• Integrated analysis of transcriptome, proteome, and phosphoproteome data.
• Utilized IQGAP2 knockdown models in HaCaT and HEK293 cell lines.
• Employed AKT and mTOR inhibitors to assess rescue effects on cell proliferation.

Main Results:

• IQGAP2 knockdown led to the dysregulation of the IQGAP2-mTOR molecular network, resulting in elevated cell proliferation.
• Knockdown of IQGAP2 enhanced the phosphorylation of AKT and S6K, contributing to increased cell proliferation.
• AKT and mTOR inhibitors partially restored normal cell proliferation by mitigating hyperphosphorylation.

Conclusions:

• IQGAP2 deficiency dysregulates the IQGAP2-mTOR pathway, promoting aberrant cell proliferation.
• The mTOR signaling pathway is implicated in the uncontrolled cell proliferation observed in IQGAP2 knockdown cells.
• These findings present a potential therapeutic avenue for managing conditions associated with IQGAP2 deficiency.