High expression of claudin-1 protein in papillary thyroid tumor and its regional lymph node metastasis

Júlia Németh, Zsuzsanna Németh, Péter Tátrai, Ilona Péter, Áron Somorácz, Attila Marcell Szász, András Kiss, Zsuzsa Schaff

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Claudins, known as major contributors in the formation of the tight junction, are differentially expressed in malignant tumors as compared to the corresponding healthy tissues. Therefore, they are thought to play a role in carcinogenesis and tumor progression. Altered expression of claudin-1 has been reported in several tumor types including endometrial, papillary renal cell and colonic carcinoma, and increased claudin-1 mRNA levels have been observed in papillary thyroid carcinoma (PTC). In this study, we aimed at determining the pattern of claudin-1 expression in various types of thyroid lesions at the protein level and investigating the immunolocalization of β-catenin reported to regulate claudin-1 expression. Samples included 19 PTCs, ten cases of corresponding regional lymph node metastasis, eight papillary microcarcinomas (PMC), 17 follicular thyroid carcinomas (FTC) and 19 follicular adenomas (FA). All cases were evaluated by quantitative immunohistochemistry. Conspicuous claudin-1 immunostaining was detected in the majority of PTC/PMC primary tumors and lymph node metastases (19/27 and 9/10, respectively). On the other hand, we found weak or no claudin-1 expression in any of the FA and FTC cases or peritumoral non-malignant thyroid tissues. Our data prove that high claudin-1 protein expression is specific for PTC and its regional lymph node metastases, while we failed to verify that claudin-1 is regulated by β-catenin in thyroid tumors. Based on these results, claudin-1 may be a useful tumor marker for PTC.

Original languageEnglish
Pages (from-to)19-27
Number of pages9
JournalPathology and Oncology Research
Issue number1
Publication statusPublished - Mar 2010



  • Claudin-1
  • Lymph node metastasis
  • Papillary thyroid carcinoma
  • Tumor marker

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Oncology
  • Cancer Research

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