4.8 Article

CRL2KLHDC3 mediates p14ARF N-terminal ubiquitylation degradation to promote non-small cell lung carcinoma progression

Journal

ONCOGENE
Volume 41, Issue 22, Pages 3104-3117

Publisher

SPRINGERNATURE
DOI: 10.1038/s41388-022-02318-6

Keywords

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Funding

  1. Special Reserach Program of Sun Yat-sen University Cancer Center
  2. National Special Research Program of China for Important Infectious Diseases [2018ZX10302103, 2017ZX10202102]
  3. Important Key Program of NSFC [81730060]
  4. Joint-Innovation Program in Healthcare for Special Scientific Research Projects of Guangzhou [201803040002]
  5. Natural Science Foundation of Guangdong, China (Excellent Youth Foundation)
  6. Fundamental Research Funds for the Central Universities

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In this study, the role of KLHDC3 in non-small cell lung cancer (NSCLC) was investigated. Higher expression of KLHDC3 was associated with worse overall survival in NSCLC patients. KLHDC3 deficiency affected the proliferation of NSCLC cell lines and its interaction with CUL2 E3 ligase and tumor suppressor p14ARF. Gefitinib-resistant NSCLC cell lines displayed higher KLHDC3 protein levels. Furthermore, KLHDC3 shortage increased the sensitivity of lung cancer cells to EGFR-targeted drugs.
Kelch superfamily involves a variety of proteins containing multiple kelch motif and is well characterized as substrate adaptors for CUL3 E3 ligases, which play critical roles in carcinogenesis. However, the role of kelch proteins in lung cancer remains largely unknown. In this study, the non-small cell lung cancer (NSCLC) patients with higher expression of a kelch protein, kelch domain containing 3 (KLHDC3), showed worse overall survival. KLHDC3 deficiency affected NSCLC cell lines proliferation in vitro and in vivo. Further study indicated that KLHDC3 mediated CUL2 E3 ligase and tumor suppressor p14ARF interaction, facilitating the N-terminal ubiquitylation and subsequent degradation of p14ARF. Interestingly, Gefitinib-resistant NSCLC cell lines displayed higher KLHDC3 protein levels. Gefitinib and Osimertinib medications were capable of upregulating KLHDC3 expression to promote p14ARF degradation in the NSCLC cell lines. KLHDC3 shortage significantly increased the sensitivity of lung cancer cells to epidermal growth factor receptor (EGFR)-targeted drugs, providing an alternative explanation for the development of Gefitinib and Osimertinib resistance in NSCLC therapy. Our works suggest that CRL2(KLHDC3) could be a valuable target to regulate the abundance of p14ARF and postpone the occurrence of EGFR-targeted drugs resistance.

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