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Human OCTN2 (SLC22A5) is down-regulated in virus- and nonvirus-mediated cancer

Mariafrancesca Scalise1, Michele Galluccio, Rosita Accardi

  • 1Department of Cell Biology, University of Calabria, Via P. Bucci 4c 87036 Arcavacata di Rende, Italy.

Cell Biochemistry and Function
|March 1, 2012
PubMed

Insights

Carnitine transporter OCTN2 is downregulated in various cancers, likely due to DNA methylation. This impacts cancer cell metabolism and offers potential therapeutic targets.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • The carnitine transporter OCTN2 plays a role in cellular metabolism.
  • Dysregulation of OCTN2 may contribute to cancer development.
  • Human papillomavirus (HPV) is implicated in various epithelial cancers.

Purpose of the Study:

  • To investigate OCTN2 expression in virus-mediated and non-virus-mediated epithelial cancers.
  • To elucidate the mechanism behind OCTN2 downregulation in cancer.

Main Methods:

  • Evaluating OCTN2 mRNA and protein levels in HPV-infected keratinocytes and cancer cell lines.
  • Assessing the role of p53 in OCTN2 regulation.
  • Utilizing 5-aza-cytidine treatment to investigate DNA methylation's role in OCTN2 expression.

Main Results:

  • OCTN2 expression (mRNA and protein) was reduced in HPV16 E6/E7-transduced keratinocytes and HPV16-infected CaSki cells.
  • OCTN2 downregulation was observed in non-virus-related epithelial cancer cell lines.
  • 5-aza-cytidine treatment rescued OCTN2 expression, indicating DNA methylation as the mechanism.
  • OCTN2 downregulation is independent of p53 transcriptional activity.

Conclusions:

  • OCTN2 transporter is generally downregulated in both virus- and non-virus-mediated epithelial cancers.
  • Promoter region DNA methylation is likely responsible for OCTN2 downregulation.
  • This finding highlights OCTN2 as a potential biomarker and therapeutic target in epithelial cancers.

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