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Leucine Zipper Downregulated in Cancer-1 Interacts with Clathrin Adaptors to Control Epidermal Growth Factor Receptor
Hsien-Neng Huang1,2, Pin-Feng Hung3, Yai-Ping Chen3
1Department of Pathology, National Taiwan University Hospital Hsin-Chu Branch, No. 25, Ln. 442, Section 1, Jingguo Road, North Dist., Hsinchu 300195, Taiwan.
Leucine zipper downregulated in cancer-1 (LDOC1) affects epidermal growth factor receptor (EGFR) internalization in non-small cell lung cancer (NSCLC). LDOC1 depletion reduces sensitivity to EGFR-tyrosine kinase inhibitors (TKIs), suggesting LDOC1 as a prognostic biomarker.
Area of Science:
- Oncology
- Molecular Biology
- Cell Biology
Background:
- Epidermal growth factor receptor (EGFR) drives non-small cell lung cancer (NSCLC).
- Clathrin-mediated internalization (CMI) sustains EGFR signaling.
- AXL confers resistance to EGFR-tyrosine kinase inhibitors (TKIs) in EGFR-mutated (EGFRM) NSCLC.
Purpose of the Study:
- Investigate Leucine zipper downregulated in cancer-1 (LDOC1) effects on EGFR CMI and NSCLC treatment.
- Determine LDOC1's role in EGFR signaling and TKI sensitivity.
Main Methods:
- Coimmunoprecipitation and double immunofluorescence staining.
- Confocal microscopy, cell surface labeling, and immunohistochemistry.
- Investigated LDOC1 interaction with clathrin adaptors and EGFR internalization.
Main Results:
- LDOC1 depletion promotes EGFR internalization and recycling in EGFRM NSCLC cells.
- LDOC1 depletion enhances EGFR, AXL, HER2, and HER3 activation.
- Reduced sensitivity to gefitinib and erlotinib observed in LDOC1-depleted cells.
- LDOC1 downregulation correlated with poor survival in EGFRM NSCLC patients receiving gefitinib.
Conclusions:
- LDOC1 regulates first-generation EGFR-TKI efficacy via EGFR CMI.
- LDOC1 may serve as a prognostic biomarker for EGFRM NSCLC.
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