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J. Exp. Med., Volume 189, Number 11, June 7, 1999 1783-1789

Thioredoxin, a Redox Enzyme Released in Infection and Inflammation, Is a Unique Chemoattractant for Neutrophils, Monocytes, and T Cells

By Riccardo Bertini,* O.M. Zack Howard,Dagger Hui-Fang Dong,Dagger Joost J. Oppenheim,Dagger Cinzia Bizzarri,§ Rita Sergi,* Gianfranco Caselli,* Sabrina Pagliei,* Brie Romines,parallel Jennifer A. Wilshire,parallel Manuela Mengozzi,parallel Hajime Nakamura, Junji Yodoi, Klas Pekkari,** Ramanathan Gurunath,** Arne Holmgren,** Leonore A. Herzenberg,parallel Leonard A. Herzenberg,parallel and Pietro Ghezziparallel

From the * Dompé Research Center, 67100 L'Aquila, Italy; the Dagger  Laboratory of Molecular Immunoregulation, National Cancer Institute-Frederick Cancer Research Development Center, Frederick, MD 21702; § Consorzio Biolaq, 67100 L'Aquila, Italy; the parallel  Department of Genetics, Stanford University School of Medicine, Stanford, CA 94305; the  Department of Biological Responses, Institute for Virus Research, Kyoto University, Kyoto 606, Japan; and the ** Medical Nobel Institute for Biochemistry, Karolinska Institutet, S-17177 Stockholm, Sweden

Thioredoxin (Trx) is a ubiquitous intracellular protein disulfide oxidoreductase with a CXXC active site that can be released by various cell types upon activation. We show here that Trx is chemotactic for monocytes, polymorphonuclear leukocytes, and T lymphocytes, both in vitro in the standard micro Boyden chamber migration assay and in vivo in the mouse air pouch model. The potency of the chemotactic action of Trx for all leukocyte populations is in the nanomolar range, comparable with that of known chemokines. However, Trx does not increase intracellular Ca2+ and its activity is not inhibited by pertussis toxin. Thus, the chemotactic action of Trx differs from that of known chemokines in that it is G protein independent. Mutation of the active site cysteines resulted in loss of chemotactic activity, suggesting that the latter is mediated by the enzyme activity of Trx. Trx also accounted for part of the chemotactic activity released by human T lymphotropic virus (HTLV)-1-infected cells, which was inhibited by incubation with anti-Trx antibody. Since Trx production is induced by oxidants, it represents a link between oxidative stress and inflammation that is of particular interest because circulating Trx levels are elevated in inflammatory diseases and HIV infection.

Key words: chemotaxis;  thioredoxin;  HTLV-1;  migration


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