N-end rule pathway inhibitor sensitizes cancer cells to antineoplastic agents by regulating XIAP and RAD21 protein

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Updated: Jan 21, 2026

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells
10:43

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells

Published on: May 24, 2014

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Subrata K Pore1,2, Anirban Ganguly1, Samaresh Sau3

  • 1Department of Applied Biology, CSIR-Indian Institute of Chemical Technology, Hyderabad, India.

Journal of Cellular Biochemistry
|August 14, 2019
PubMed

Insights

A novel N-end rule pathway inhibitor, RF-C11, enhances anticancer drug efficacy by sensitizing cancer cells. This approach targets cell cycle and apoptosis pathways, offering new combination therapy strategies for cancer treatment.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cancer Research

Background:

  • Anticancer drugs face resistance due to cancer cell adaptability.
  • The N-end rule pathway regulates protein degradation, potentially impacting cancer progression.
  • Its specific role in cancer and therapeutic targeting remain underexplored.

Purpose of the Study:

  • To investigate the role of the N-end rule pathway in cancer.
  • To evaluate the efficacy of a novel N-end rule pathway inhibitor, RF-C11, in sensitizing cancer cells to existing anticancer drugs.
  • To elucidate the molecular mechanisms underlying RF-C11's sensitization effects.

Main Methods:

  • Development of a non-peptide N-end rule pathway inhibitor (RF-C11).
  • Assessment of RF-C11's effect on cancer cell sensitization to various anticancer agents.
  • Analysis of protein expression levels, including X-linked inhibitor of apoptosis protein and RAD21, in response to RF-C11 treatment.
  • Investigation of cell cycle progression, specifically the metaphase to anaphase transition.

Main Results:

  • RF-C11 significantly sensitized cancer cells, but not non-cancer cells, to multiple anticancer drugs.
  • Sensitization was associated with the downregulation of the antiapoptotic protein X-linked inhibitor of apoptosis protein.
  • RF-C11 treatment led to RAD21 stabilization, inhibiting the metaphase to anaphase promotion.

Conclusions:

  • The N-end rule pathway is a viable target for overcoming anticancer drug resistance.
  • RF-C11 demonstrates potential as an additive in combination cancer therapy.
  • Further development of RF-C11 or its analogs could lead to novel therapeutic strategies for cancer treatment.
Keywords:
N-end ruleRAD21UBR1XIAPcancerdrug sensitivity

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