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Kinectin1 depletion promotes EGFR degradation via the ubiquitin-proteosome system in cutaneous squamous cell

Ji Ma1, Shudong Ma2, Ying Zhang1

  • 1Department of Radiation Medicine, Guangdong Provincial Key Laboratry of Tropical Disease Research, School of Public Health, Southern Medical University, 510515, Guangzhou, China.

Cell Death & Disease
|October 24, 2021
PubMed

Insights

Depleting kinectin1 (KTN1) inhibits cutaneous squamous cell carcinoma (cSCC) by promoting epidermal growth factor receptor (EGFR) degradation through the ubiquitin-proteasome system. This mechanism involves specific protein interactions and has implications for cSCC tumor suppression.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Cutaneous squamous cell carcinoma (cSCC) tumorigenesis is linked to epidermal growth factor receptor (EGFR) signaling.
  • Kinectin1 (KTN1) depletion shows potential for inhibiting cSCC by reducing EGFR levels, but its mechanism is unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which KTN1 depletion inhibits cSCC.
  • To investigate the role of KTN1 in regulating EGFR protein levels and degradation in cSCC cells.

Main Methods:

  • KTN1 knockdown in cSCC cell lines.
  • Analysis of EGFR degradation pathways, including the ubiquitin-proteasome system.
  • Investigation of protein-protein interactions involving KTN1, EGFR, CCDC40, PSMA1, ADRM1, and UCH37.
  • Studies in mouse xenografts and human patient samples.

Main Results:

  • KTN1 knockdown induces tumor cell-specific EGFR degradation via the ubiquitin-proteasome system.
  • KTN1 depletion upregulates CCDC40, PSMA1, and ADRM1, mediating tumor suppressor functions.
  • c-Myc directly regulates CCDC40 expression, initiating the CCDC40-ADRM1-UCH37 axis to promote EGFR deubiquitination.
  • KTN1 depletion enhances EGFR degradation by modulating the competitive interaction between PSMA1 and ADRM1.

Conclusions:

  • KTN1 plays a crucial role in regulating EGFR stability in cSCC.
  • The findings reveal a novel mechanism of KTN1-mediated EGFR degradation involving the ubiquitin-proteasome system and specific protein interactions.
  • This study provides mechanistic insights into KTN1's tumor suppressor function in cSCC, offering potential therapeutic targets.

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