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DOI: 10.1055/s-2002-33258
APE/Ref-1 is Controlled by Both Redox and cAMP-Dependent Mechanisms in Rat Thyroid Cells
Publication History
Received 26 July 2001
Accepted after Revision 12 February 2002
Publication Date:
12 August 2002 (online)
Abstract
APE/Ref-1 is a multifunctional protein possessing both redox and DNA repair functions. Through its redox activity, APE/Ref-1 controls the DNA-binding function of several transcriptional regulators (AP1, NF-κB, p53, Pax proteins). We have previously shown that APE/Ref-1 upregulates the transcriptional activity of the thyroid-specific transcription factor Pax8. In thyroid cells, APE/Ref-1 can be detected both in the nuclear and cytoplasmatic compartments. In this study regulatory mechanisms acting on APE/Ref-1 were revealed using the FRTL-5 cell line. TSH induces both cytoplasm-to-nucleus translocation and neosynthesis of APE/Ref-1 protein. Interestingly, only neosynthesis is dependent on cAMP signalling. In contrast, the cytoplasm-to-nucleus translocation is dependent on redox-mediated mechanisms. Based upon the data shown in this study and in others, a bimodal control of APE/Ref-1 by TSH can be delineated.
Key words
APE/Ref-1 - Redox Potential - Nuclear Translocation - Thyroid - cAMP
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Prof. G. Damante
Dipartimento di Scienze e Tecnologie Biomediche, Università di Udine
Piazzale Kolbe 1 · 33100 Udine · Italy ·
Phone: + 39 (0432) 494374.
Fax: + 39 (0432) 494379.
Email: Gdamante@makek.dstb.uniud.it