Galectin-3, a beta-galactoside binding lectin, is highly expressed in thyroid carcinomas of follicular cell origin, whereas neither benign thyroid adenomas nor normal thyroid tissues express galectin-3. We previously showed that antisense inhibition of galectin-3 expression markedly reduced the malignant phenotype of thyroid papillary carcinoma cells. In the present study we transfected galectin-3 cDNA into TAD-2 normal thyroid follicular cells. Stable transfectants expressing galectin-3 acquired the phenotype of serum-independent growth, clonogenicity in soft agar, as well as loss of contact inhibition. We also compared the gene expression profile of the galectin-3 transfectants to that of the vehicle control, which revealed that a series of genes were differentially expressed between the two. They include proliferating cell nuclear antigen, replication factor C, and retinoblastoma genes that participate in G1-S transition. These results indicate the transformation of thyroid follicular cells by galectin-3 and possible involvement of galectin-3 in cell cycle.
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