J Interferon Res. 1990 Dec;10(6):599-603.

Immune activation and decreased tryptophan in patients with HIV-1 infection.

Fuchs D, Forsman A, Hagberg L, Larsson M, Norkrans G, Reibnegger G, Werner ER, Wachter H.

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Institute of Medical Chemistry and Biochemistry, University of Innsbruck, Austria.

Abstract

We compared tryptophan, neopterin, and interferon-gamma (IFN-gamma) concentrations in serum and cerebrospinal fluid (CSF) of 22 patients with human immunodeficiency virus type 1 (HIV-1) infection. Tryptophan levels were found to be decreased in CSF and serum of patients whereas neopterin levels in CSF and serum and serum IFN-gamma concentrations were increased compared to healthy HIV-1 seronegatives. Tryptophan concentrations correlated negatively to neopterin concentrations, and serum neopterin concentrations correlated positively to IFN-gamma concentrations. Thus, decrease of tryptophan levels is associated with chronic immune stimulation in patients with HIV-1 infection. From the data it appears that reduced tryptophan in patients may result from induction of indoleamine (2,3)-dioxygenase by IFN-gamma.

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