Frizzled-1 is down-regulated in follicular thyroid tumours and modulates growth and invasiveness

• Published in: The Journal of pathology 2008-05, Vol.215 (1), p.87-96
• Main Authors: Ulivieri, A, Lavra, L, Dominici, R, Giacomelli, L, Brunetti, E, Sciacca, L, Trovato, M, Barresi, G, Foukakis, T, Jia-Jing, L, Larsson, C, Bartolazzi, A, Sciacchitano, S
• Format: Article
• Language: English
• Subjects: Adenocarcinoma, Follicular - genetics; Adenocarcinoma, Follicular - metabolism; Adenocarcinoma, Follicular - pathology; Biological and medical sciences; Carcinoma, Papillary - genetics; Carcinoma, Papillary - metabolism; Carcinoma, Papillary - pathology; Cell Line, Tumor; Cell Proliferation; Endocrinopathies; follicular thyroid carcinoma; Frizzled Receptors - genetics; FZD-1; Gene Expression Profiling; Gene Expression Regulation, Neoplastic; Humans; Investigative techniques, diagnostic techniques (general aspects); Loss of Heterozygosity; Malignant tumors; Medical sciences; Medicin och hälsovetenskap; Neoplasm Invasiveness - genetics; Oligonucleotide Array Sequence Analysis; Pathology. Cytology. Biochemistry. Spectrometry. Miscellaneous investigative techniques; Reverse Transcriptase Polymerase Chain Reaction; RNA, Messenger - analysis; thyroid carcinoma cell lines; Thyroid Neoplasms - genetics; Thyroid Neoplasms - metabolism; Thyroid Neoplasms - pathology; Thyroid. Thyroid axis (diseases); tumour suppressor gene
• ISSN: 0022-3417; 1096-9896
• DOI: 10.1002/path.2331

The mechanisms of follicular thyroid carcinoma (FTC) transformation and progression are not well understood. Previously, we detected LOH at 7q21 in all FTCs examined, indicating that loss of genetic material in that region is a common trait in these lesions. To analyse the effects of LOH on gene expression, we performed an analysis of the mRNA expression levels of six different genes, located at 7q21.1-7q21.3. A total of 23 lesions, including eight follicular hyperplasias (FHs), eight follicular adenomas (FAs), two FTCs and five papillary thyroid carcinomas (PTCs) were analysed. The Frizzled-1 (FZD-1) gene, located at 7q21.13, showed the lowest levels of mRNA expression. Down-regulation of FZD-1 expression was also confirmed in an independent series of 69 follicular neoplastic lesions compared to 25 PTCs, analysed by quantitative RT-PCR. In vitro studies showed that FZD-1 expression was also markedly reduced at both protein and mRNA levels in three FTC-derived cell lines (FRO, WRO and FTC-133), while it was normal in the three PTC-derived cell lines (Ca300, Ca301 and K1) examined. We demonstrated that over-expression of FZD-1 in 3 FTC-derived cells decreased invasiveness and proliferation rate, indicating a possible pathogenetic role. In addition, FZD-1 RNA interference in the PTC-derived cell line K1 increased invasiveness. Our data indicated that FZD-1 is involved in growth of follicular tumours and may be considered as a novel marker of this type of tumour. Copyright © 2008 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.