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Molecular backgrounds of ERAP1 downregulation in cervical carcinoma

Akash M Mehta1, Michelle Osse1, Sandra Kolkman-Uljee1

  • 1Department of Pathology, Leiden University Medical Center, L1-Q, 2333 ZA Leiden, Netherlands.

Analytical Cellular Pathology (Amsterdam)
|July 7, 2015
PubMed

Insights

Defective ERAP1 protein expression in cervical cancer is linked to lower ERAP1 mRNA levels. Loss of heterozygosity in the ERAP1 gene contributes to this downregulation, impacting immune recognition.

Area of Science:

  • Immunology
  • Oncology
  • Molecular Biology

Background:

  • The antigen processing machinery (APM) is crucial for immune surveillance of infected and cancerous cells.
  • Reduced expression of ERAP1, an APM component, correlates with cervical carcinoma progression and poor outcomes.
  • Mechanisms driving ERAP1 protein downregulation in cervical cancer are not fully understood.

Purpose of the Study:

  • To investigate the mechanisms underlying ERAP1 protein downregulation in cervical carcinoma.
  • To analyze ERAP1 mRNA levels and their correlation with protein expression.
  • To explore pretranscriptional mechanisms, including DNA mutations and loss of heterozygosity, affecting ERAP1.

Main Methods:

  • Analysis of ERAP1 mRNA expression in 14 patients with established ERAP1 protein downregulation.
  • Investigation of ERAP1 DNA mutation status and single nucleotide polymorphisms.
  • Assessment of loss of heterozygosity at various loci within the ERAP1 gene.

Main Results:

  • ERAP1 mRNA levels were significantly lower in tumors with ERAP1 protein downregulation compared to those with normal expression (P = 0.001).
  • Loss of heterozygosity was observed in up to 50% of tumors exhibiting ERAP1 downregulation.
  • Data suggest a strong association between ERAP1 downregulation and loss of heterozygosity.

Conclusions:

  • ERAP1 downregulation in cervical carcinoma is linked to significantly reduced mRNA levels.
  • Loss of heterozygosity is a key mechanism contributing to ERAP1 downregulation in vivo.
  • These findings offer initial insights into the molecular mechanisms of ERAP1 downregulation in cervical cancer.

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