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Tumor suppressor role of the CL2/DRO1/CCDC80 gene in thyroid carcinogenesis

Angelo Ferraro1, Filippo Schepis, Vincenza Leone

  • 1Istituto per l'Endocrinologia e l'Oncologia Sperimentale G Salvatore, Dipartimento di Medicina Molecolare e Biotecnologie Mediche, Università degli Studi di Napoli Federico II, Fondazione Pascale, 80131 Napoli, Italy. ferraro@eie.gr

The Journal of Clinical Endocrinology and Metabolism
|May 14, 2013
PubMed
Abstract

Insights

The CL2/CCDC80 gene, implicated in thyroid cancer, shows significantly lower expression in thyroid carcinomas. Restoring its expression suppressed malignant phenotypes, suggesting CL2/CCDC80 acts as a tumor suppressor in thyroid carcinogenesis.

Area of Science:

  • Endocrinology
  • Oncology
  • Molecular Biology

Background:

  • Thyroid carcinoma is a common endocrine malignancy with frequently activated oncogenes but unidentified tumor suppressor genes.
  • Previous research suggested a potential link between the CL2/CCDC80 gene and thyroid cancer development.

Purpose of the Study:

  • To investigate the expression levels of the CL2/CCDC80 gene in human thyroid carcinomas.
  • To determine the role of CL2/CCDC80 in thyroid carcinogenesis and its potential as a tumor suppressor.

Main Methods:

  • Evaluated CL2/CCDC80 gene expression across various human thyroid neoplastic tissues.
  • Assessed the impact of restoring CL2/CCDC80 expression in human thyroid carcinoma cell lines with low endogenous levels.

Main Results:

  • CL2/CCDC80 expression was significantly reduced in thyroid carcinomas compared to normal tissues, with the lowest levels in follicular variants of papillary carcinomas.
  • Loss of heterozygosity contributed to CL2/CCDC80 down-regulation.
  • Reintroducing CL2/CCDC80 expression in carcinoma cell lines increased apoptosis, suppressed malignant characteristics, and upregulated E-cadherin, inhibiting cancer progression.

Conclusions:

  • CL2/CCDC80 functions as a putative tumor suppressor gene in the context of thyroid carcinogenesis.
  • The findings highlight CL2/CCDC80 as a potential therapeutic target for thyroid cancer.

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