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Expression of transforming growth factor-β1, activin A and their receptors in thyroid follicle cells: negative regulation of thyroid growth and function
Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Genetics and Pathology.
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1999 In: Endocrinology, Vol. 140, no 9, 4300-4310 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
1999. Vol. 140, no 9, 4300-4310 p.
URN: urn:nbn:se:uu:diva-89592OAI: oai:DiVA.org:uu-89592DiVA: diva2:161217
Available from: 2002-01-16 Created: 2002-01-16Bibliographically approved
In thesis
1. Regulatory Effects of TGF-β Superfamily Members on Normal and Neoplastic Thyroid Epithelial Cells
Open this publication in new window or tab >>Regulatory Effects of TGF-β Superfamily Members on Normal and Neoplastic Thyroid Epithelial Cells
2002 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Thyroid growth and function is partly regulated by growth factors binding to receptors on the cell surface. In the present thesis, the transforming growth factor-β (TGF-β) superfamily members have been studied for their role in regulation of growth and differentiation of both normal and neoplastic thyroid epithelial cells.

TGF-β1 is a negative regulator of thyrocyte growth and function. However, the importance of other TGF-β superfamily members has not been fully investigated. TGF-β1, activin A, bone morphogenetic protein (BMP)-7 and their receptors were found to be expressed in porcine thyrocytes. In addition to TGF-β1, activin A was also found to be a negative regulator of thyroid growth and function, and both stimulated phosphorylation and nuclear translocation of Smad proteins. Furthermore, TGF-β1 and epidermal growth factor (EGF) demonstrated a synergistic negative effect on thyrocyte differentiation. Simultaneous addition of the two factors resulted in a loss of the transepithelial resistance and expression of the epithelial marker E-cadherin. This was followed by a transient expression of N-cadherin.

Despite the extremely malignant character of anaplastic thyroid carcinoma (ATC) tumor cells, established cell lines are still responsive to TGF-β1. A majority of the cell lines were also found to be growth inhibited by BMP-7. BMP-7 induced cell cycle arrest of the ATC cell line HTh 74 in a dose- and cell density-dependent manner. This was associated with upregulation of p21CIP1 and p27KIP1, decreased cyclin-dependent kinase (Cdk) activity and hypophosphorylation of the retinoblastoma protein (pRb). TGF-β1, and to some extent also BMP-7, induced the expression of N-cadherin and matrix metalloproteinase (MMP)-2 and -9. Stimulation of HTh 74 cells with TGF-β1 increased the migration through a reconstituted basement membrane indicating an increased invasive phenotype of the cells.

Taken together, these data show that TGF-β superfamily members not only affect growth and function of normal thyroid follicle cells but may also, in combination with EGF, play a role in cell dedifferentiation. This study additionally suggests that the TGF-β superfamily members may be important for the invasive properties of ATC cells.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2002. 56 p.
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Medicine, ISSN 0282-7476 ; 1114
Genetics, activin, BMP, cadherin, carcinoma, cell cycle arrest, dedifferentiation, EGF, growth inhibition, invasion, Smad, TGF-β, thyroid, Genetik
National Category
Medical Genetics
Research subject
urn:nbn:se:uu:diva-1624 (URN)91-554-5216-7 (ISBN)
Public defence
2002-02-09, Rudbecksalen, Rudbecklaboratoriet, Uppsala, 09:15
Available from: 2002-01-16 Created: 2002-01-16Bibliographically approved

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