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Infection and Immunity, July 2002, p. 3959-3961, Vol. 70, No. 7
0019-9567/02/$04.00+0 DOI: 10.1128/IAI.70.7.3959-3961.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Cytokines Induce Indoleamine 2,3-Dioxygenase Expression in Human Atheroma-Associated Cells: Implications for Persistent Chlamydophila pneumoniae Infection
Jessica B. Sakash,1,2 Gerald I. Byrne,3 Andrew Lichtman,1 and Peter Libby2*
Vascular Research Division Department of Pathology, and,1
Leducq Center for Cardiovascular Research, Brigham and Women's Hospital, Boston, Massachusetts 02115,2
Department of Medical Microbiology and Immunology, University of Wisconsin, Madison, Wisconsin 537063
Received 26 December 2001/
Returned for modification 26 February 2002/
Accepted 2 April 2002
This study shows that vascular smooth muscle cells express significantly higher levels of gamma interferon-inducible indoleamine 2,3-dioxygenase (IDO) activity than endothelium or mononuclear cells. Since IDO activity is linked to persistent Chlamydophila pneumoniae infection, our results suggest that smooth muscle cells may be an important reservoir of that organism in atherosclerosis.
* Corresponding author. Mailing address: Leducq Center for Cardiovascular Research, Brigham and Women's Hospital, 221 Longwood Ave., Boston, MA 02115. Phone: (617) 732-6628. Fax: (617) 732-6961. E-mail:
plibby{at}rics.bwh.harvard.edu.
Editor: J. T. Barbieri
Infection and Immunity, July 2002, p. 3959-3961, Vol. 70, No. 7
0019-9567/02/$04.00+0 DOI: 10.1128/IAI.70.7.3959-3961.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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