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J. Exp. Med.,
Volume 189, Number 11, June 7, 1999 1783-1789
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From the * Dompé Research Center, 67100 L'Aquila, Italy; the 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.
Laboratory of Molecular
Immunoregulation, National Cancer Institute-Frederick Cancer Research Development Center,
Frederick, MD 21702; § Consorzio Biolaq, 67100 L'Aquila, Italy; the
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
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