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Horm Metab Res 2010; 42(12): 846-853
DOI: 10.1055/s-0030-1265215
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© Georg Thieme Verlag KG Stuttgart · New York

UVC Radiation-induced Effect on Human Primary Thyroid Cell Proliferation and HLA-DR Expression

I. Kostic1 , 2 , B. Toffoletto3 , M. Toller2 , C. A. Beltrami3 , F. S. Ambesi-Impiombato2 , F. Curcio2
  • 1Institute of Pathophysiology, School of Medicine, University of Kragujevac, Kragujevac, Serbia
  • 2Dipartimento di Patologia e Medicina Sperimentale e Clinica, Università degli Studi di Udine, Udine, Italy
  • 3Centro di Medicina Rigenerativa, CIME, Università degli Studi di Udine, Udine, Italy
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Publication History

received 17.02.2010

accepted 26.08.2010

Publication Date:
30 September 2010 (online)

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Abstract

The aim of this study was to examine how UVC irradiation will affect normal human thyroid cell proliferation and HLA-DR expression. Primary human thyroid cells were exposed to UVC (254 nm wavelength) irradiation. In some experiments 0.5 mM buthionine sulfoximine (BSO) was added. Apoptosis was detected measuring annexin V, proteins involved in apoptotic process (p53, Bax, Bcl-2, caspase 3, and 9) by immunoblot analysis and HLA-DR expression by FACS. UVC induced a cell cycle arrest in G0/G1 phase in the first 24 h, accumulation of cells in the S phase 72 h after treatment, and an increase of apoptotic cells. BSO pretreatment showed an earlier appearance and a higher percentage of apoptosis. p53, caspase 3 and 9 were increased, while Bax and Bcl-2 were decreased. We also observed a transient significant increase in HLA-DR expression. UVC inhibited cell proliferation and induced apoptosis in normal human primary thyroid cells. An inhibitor of glutathione synthesis induced an earlier appearance and higher percentage of apoptosis suggesting that oxidative stress may play a role. Apoptotis involved components of the intrinsic mitochondrial pathway. A transient increase in HLA-DR expression after UVC irradiation could play a role in inducing AITD.

Key words

UVC irradiation - human primary thyroid cells - cell cycle - apoptosis - HLA-DR

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Correspondence

Prof. Dr. F. Curcio

Dipartimento di Patologia e

Medicina Sperimentale e Clinica

Università degli Studi di Udine

P.le M. Kolbe 4

33100 Udine

Italy

Phone: +39/0432/559 201

Fax: +39/0432/494 301

Email: curcio@uniud.it