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Molecular and Cellular Biology, November 1998, p. 6493-6504, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Thioredoxin Reductase Mediates Cell Death Effects of the Combination of Beta Interferon and Retinoic Acid

Edward R. Hofman,1 Madanamohan Boyanapalli,1,2 Daniel J. Lindner,1,2 Xiao Weihua,1,2 Bret A. Hassel,1,2 Rosemary Jagus,3 Peter L. Gutierrez,2 and Dhananjaya V. Kalvakolanu1,2,4,5,*

Department of Microbiology & Immunoogy,1 Greenebaum Cancer Center,2 Molecular and Cellular Biology Program,4 and Program in Oncology,5 School of Medicine, and Center of Marine Biotechnology,3 University of Maryland, Baltimore, Maryland 21201

Received 12 March 1998/Returned for modification 5 May 1998/Accepted 3 August 1998

Interferons (IFNs) and retinoids are potent biological response modifiers. By using JAK-STAT pathways, IFNs regulate the expression of genes involved in antiviral, antitumor, and immunomodulatory actions. Retinoids exert their cell growth-regulatory effects via nuclear receptors, which also function as transcription factors. Although these ligands act through distinct mechanisms, several studies have shown that the combination of IFNs and retinoids synergistically inhibits cell growth. We have previously reported that IFN-beta -all-trans-retinoic acid (RA) combination is a more potent growth suppressor of human tumor xenografts in vivo than either agent alone. Furthermore, the IFN-RA combination causes cell death in several tumor cell lines in vitro. However, the molecular basis for these growth-suppressive actions is unknown. It has been suggested that certain gene products, which mediate the antiviral actions of IFNs, are also responsible for the antitumor actions of the IFN-RA combination. However, we did not find a correlation between their activities and cell death. Therefore, we have used an antisense knockout approach to directly identify the gene products that mediate cell death and have isolated several genes associated with retinoid-IFN-induced mortality (GRIM). In this investigation, we characterized one of the GRIM cDNAs, GRIM-12. Sequence analysis suggests that the GRIM-12 product is identical to human thioredoxin reductase (TR). TR is posttranscriptionally induced by the IFN-RA combination in human breast carcinoma cells. Overexpression of GRIM-12 causes a small amount of cell death and further enhances the susceptibility of cells to IFN-RA-induced death. Dominant negative inhibitors directed against TR inhibit its cell death-inducing functions. Interference with TR enzymatic activity led to growth promotion in the presence of the IFN-RA combination. Thus, these studies identify a novel function for TR in cell growth regulation.


* Corresponding author. Mailing address: Department of Microbiology & Immunology, Greenebaum Cancer Center, University of Maryland School of Medicine, Baltimore, MD 21201. Phone: (410) 328-1396. Fax: (410) 328-1397. E-mail: dkalvako{at}umaryland.edu.


Molecular and Cellular Biology, November 1998, p. 6493-6504, Vol. 18, No. 11
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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