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Molecular and Cellular Biology, July 2003, p. 4598-4610, Vol. 23, No. 13
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.13.4598-4610.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Hydrogen Peroxide Triggers Nuclear Export of Telomerase Reverse Transcriptase via Src Kinase Family-Dependent Phosphorylation of Tyrosine 707

Judith Haendeler,1 Jörg Hoffmann,1 Ralf P. Brandes,2 Andreas M. Zeiher,1 and Stefanie Dimmeler1*

Molecular Cardiology, Department of Internal Medicine IV,1 Department of Physiology, University of Frankfurt, Frankfurt, Germany2

Received 2 December 2002/ Returned for modification 7 January 2003/ Accepted 18 April 2003

The regulation of telomerase reverse transcriptase (TERT) plays an important role in the proliferative capacity and survival of cells. Here, we report that exogenously as well as endogenously induced oxidative stress leads to translocation of endogenous as well as overexpressed human TERT from the nucleus into the cytosol. TERT is transported through the nuclear pores in a leptomycin-sensitive and Ran GTPase-dependent process. H2O2-induced nuclear export of TERT is preceded by TERT tyrosine phosphorylation at position 707 and prevented by the Src kinase family inhibitor PP1. Oxidative stress-induced nuclear export of TERT depends on association with the Ran GTPase. In contrast, mutation of tyrosine 707 inhibits phosphorylation induced by oxidative stress and prevents association with Ran and nuclear export of TERT. Moreover, inhibition of tyrosine phosphorylation at 707 increases the antiapoptotic capacity of TERT. Taken together, depletion of nuclear TERT by tyrosine phosphorylation-dependent nuclear export of TERT is a novel mechanism for regulation of TERT localization, which reduces the antiapoptotic activity of TERT.

* Corresponding author. Mailing address: Molecular Cardiology, Dept. of Internal Medicine IV, University of Frankfurt, Theodor Stern-Kai 7, 60590 Frankfurt, Germany. Phone: 49-69-6301-7440 or -5789. Fax: 49-69-6301-7113 or -6374. E-mail: Dimmeler{at}em.uni-frankfurt.de.

Molecular and Cellular Biology, July 2003, p. 4598-4610, Vol. 23, No. 13
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.13.4598-4610.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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