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Transforming growth factor-ß1 is more expressed in thyroid follicular adenoma than in normal tissue

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Abstract

It is well known that TSH is the main factor responsible for thyrocyte proliferation and growth. Recent studies have shown that other growth factors, including transforming growth factor-ß1 (TGF-ß1), have an important role in the control of thyrocyte proliferation and differentiation. The aim of the study was to evaluate the expression of the TGF-ß1 gene in thyroid follicular adenoma (FA) by Northern analysis, and its protein localization by immunohistochemistry. Surgically removed thyroid tissue from 56 patients with thyroid FA was screened for the study. Normal thyroid tissue from 4 patients with papillary carcinoma was used as a control. Sixteen FA (8 with a “cold” and 8 with a “hot” scintiscan pattern) having homogeneous histological characteristics were subsequently selected. FA showed greater TGF-ß1 gene expression than control tissue. There was not a statistically significant difference between “cold” and “hot” FA. Immunohistochemistry analysis showed that TGF-ß1 was located in various histological structures of the adenomas (thyrocytes, endothelium, perinervium and connective tissue); on the other hand, perinodular and control tissue did not show appreciable TGF-ß1 protein. Our data suggest that TGF-ß1 may be involved in the pathogenesis of FA. The different TGF-ß1 distribution in thyrocytes, endothelium, perinervium and connective tissue in FA suggests that TGF-ß1 may be variably expressed during the natural history of FA. Since no significant difference in TGF-ß1 gene expression between “hot” and “cold” adenomas was found, it appears that other factors are involved in their functional differentiation.

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Authors and Affiliations

  1. Clinica di Endocrinologia, University of Ancona, Ospedale di Torrette, Ancona, Italy

    P. Morosini,  A. Taccaliti, G. Arnaldi, E. Faloia, G. Giacchetti & F. Mantero

  2. Istituto di Anatomia Patologica, University of Ancona, Ospedale di Torrette, Ancona, Italy

    C. Di Loreto

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  1. P. Morosini
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  2. A. Taccaliti
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  3. C. Di Loreto
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  4. G. Arnaldi
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  5. E. Faloia
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  6. G. Giacchetti
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  7. F. Mantero
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Morosini, P., Taccaliti, A., Di Loreto, C. et al. Transforming growth factor-ß1 is more expressed in thyroid follicular adenoma than in normal tissue. J Endocrinol Invest 17, 335–340 (1994). https://doi.org/10.1007/BF03348995

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  • DOI: https://doi.org/10.1007/BF03348995

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