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J. Biol. Chem., Vol. 279, Issue 10, 8715-8722, March 5, 2004

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Intracellular Localization and Activity State of Tissue Transglutaminase Differentially Impacts Cell Death^*

Tamara Milakovic, Janusz Tucholski, Eric McCoy, and Gail V. W. Johnson

From the Department of Psychiatry, University of Alabama at Birmingham, Alabama 35294-0017

Tissue transglutaminase (tTG) is a unique member of the transglutaminase family as it is both a transamidating enzyme and a GTPase. In the cell tTG is mostly cytosolic, however it is also found in the nucleus and associated with the plasma membrane. tTG can be proapoptotic, however anti-apoptotic activities of the enzyme have also been reported. To determine how the intracellular localization and transamidating activity of tTG modulates its effects on apoptosis, HEK293 cells were transiently transfected with tTG or [C277S]tTG (which lacks transamidating activity) constructs that were targeted to different intracellular compartments. Apoptosis was induced by thapsigargin treatment, which results in increased intracellular calcium concentrations. Cytosolic tTG was pro-apoptotic, while nuclear localization of [C277S]tTG attenuated apoptosis. Membrane-targeted tTG had neither pro- nor anti-apoptotic functions. This finding indicates for the first time that intracellular localization is an important determinant of the effect of tTG on apoptosis. Previous studies have suggested that tTG may modulate retinoblastoma (Rb) protein, an important suppressor of apoptosis. tTG interacted with Rb and after induction of apoptosis, the interaction of nuclear-targeted [C277S]tTG with Rb was increased significantly concomitant with an attenuation of apoptosis. In contrast, the interaction of nuclear-targeted tTG with Rb was significantly decreased and apoptosis was not attenuated. These data suggest that tTG protects cells against apoptosis in response to stimuli that do not result in increased transamidating activity by translocating to the nucleus, and that complexing with Rb may be an important aspect of the protective effects of tTG.

Received for publication, August 1, 2003 , and in revised form, December 10, 2003.

^* This work was supported by National Institutes of Health Grant AG12396. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Dept. of Psychiatry, University of Alabama at Birmingham, 1720 7th Ave. South, SC1061, Birmingham, AL 35294-0017. Tel.: 205-934-2465; Fax: 205-934-3709; E-mail: gvwj{at}uab.edu.

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