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DIRAS3 enhances RNF19B-mediated RAC1 ubiquitination and degradation in non-small-cell lung cancer cells
Yingying Wang1, Minli Wei1, Min Su1
1Shandong Provincial Key Laboratory of Animal Cell and Developmental Biology, School of Life Sciences, Shandong University, Qingdao, China.
DIRAS3 suppresses non-small-cell lung cancer (NSCLC) cell migration by targeting RAC1 for degradation. This discovery highlights the DIRAS3-RNF19B-RAC1 pathway as crucial for NSCLC progression and potential therapeutic targeting.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Distant metastasis is the primary cause of mortality in non-small-cell lung cancer (NSCLC).
- DIRAS3, a potential tumor suppressor, is downregulated in various cancers, but its role in NSCLC metastasis is not fully understood.
Purpose of the Study:
- To elucidate the regulatory mechanism of DIRAS3 in NSCLC metastasis.
- To investigate the interaction between DIRAS3, RAC1, and RNF19B in NSCLC.
Main Methods:
- Investigated DIRAS3's effect on NSCLC cell migration.
- Analyzed DIRAS3-mediated ubiquitination and degradation of RAC1.
- Identified RNF19B as the E3 ligase involved in the DIRAS3-RNF19B-RAC1 pathway.
Main Results:
- DIRAS3 significantly suppressed NSCLC cell migration.
- DIRAS3 promoted RAC1 polyubiquitination and reduced its protein levels.
- RNF19B was identified as the E3 ligase facilitating DIRAS3-induced RAC1 degradation via the ubiquitin-proteasome pathway.
Conclusions:
- The DIRAS3-RNF19B-RAC1 axis plays a critical role in the malignant progression of NSCLC.
- This pathway presents potential prognostic markers and therapeutic targets for NSCLC treatment.
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