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Dual roles of TRIM3 in colorectal cancer by retaining p53 in the cytoplasm to decrease its nuclear expression.

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The study identifies TRIM3 as a gene involved in colorectal cancer (CRC). TRIM3 interacts with p53, influencing tumor development and potentially reversing chemotherapy resistance in p53-mutated CRC.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Colorectal cancer (CRC) is a heterogeneous disease influenced by genetic and environmental factors.
  • TP53 mutations are common in CRC and critical for tumor progression.
  • Chemotherapy resistance is a major challenge in advanced CRC treatment.

Purpose of the Study:

  • To investigate the role of TRIM3, a newly identified tumor-associated gene, in colorectal cancer.
  • To elucidate the interaction between TRIM3 and p53 (wild-type and mutant) in CRC pathogenesis.
  • To evaluate TRIM3's potential in overcoming chemotherapy resistance in CRC.

Main Methods:

  • High-content screening to identify tumor-associated genes in CRC.
  • Cell experiments to assess TRIM3's function based on p53 status.
  • Co-immunoprecipitation to confirm TRIM3-p53 interaction.
  • Analysis of TRIM3's effect on p53 localization and chemotherapy resistance.

Main Results:

  • TRIM3 was identified as a tumor-associated gene in CRC.
  • TRIM3 exhibits dual roles (tumor-suppressive/tumorigenic) dependent on p53 status.
  • TRIM3 directly interacts with the C terminus of p53.
  • TRIM3 influences p53 localization, affecting nuclear expression.
  • TRIM3 reverses oxaliplatin resistance in mutant p53 CRC cells by degrading nuclear mutant p53 and downregulating multidrug resistance genes.

Conclusions:

  • TRIM3 plays a complex role in colorectal cancer, modulated by p53.
  • TRIM3's ability to overcome chemotherapy resistance presents a potential therapeutic strategy for mutant p53 CRC.
  • Targeting TRIM3 could improve treatment outcomes for CRC patients with p53 mutations.