Skip to Content
MilliporeSigma
  • Levo-1-methyl tryptophan aggravates the effects of mouse hepatitis virus (MHV-A59) infection.

Levo-1-methyl tryptophan aggravates the effects of mouse hepatitis virus (MHV-A59) infection.

International immunopharmacology (2015-01-13)
Maite Duhalde Vega, José L Aparício, Lilia A Retegui
ABSTRACT

Mice infected with mouse hepatitis virus A59 (MHV-A59) develop autoantibodies (autoAb) to liver and kidney fumarylacetoacetate hydrolase (FAH) with a concomitant enhancement of transaminases and release of alarmins such as uric acid and high-mobility group box protein 1 (HMGB1). Tryptophan catabolism is an endogenous mechanism that restricts excessive immune responses, thereby preventing immunopathology. Since indoleamine-2,3-dioxygenase (IDO) is the key and rate-limiting enzyme of tryptophan catabolism, the aim of this work was to explore whether specific inhibition of IDO by Levo-1-methyl tryptophan (MT) could affect MHV actions. Results showed that MT strongly enhanced the hypergammaglobulinemia induced by the virus, as well as anti-MHV Ab and uric acid release. Moreover, infected mice treated with MT did express anti-FAH autoAb and high levels of serum HMGB1. Survival of MHV-infected animals treated with MT was severely reduced compared with that of MHV-infected mice or controls only treated with MT. Furthermore, histological liver examination indicated that MT induced fibrosis in MHV-infected animals, whereas MT itself increased uric acid levels without shortening the animal life Thus, under our experimental conditions, results indicated an exacerbated response to MHV infection when IDO was blocked by MT.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
o-Phenylenediamine, sublimed, ≥99%
Sigma-Aldrich
Tris(tert-butoxy)silanol, 99.999%
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 1 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 15 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 5 mg substrate per tablet
Sigma-Aldrich
DL-Tryptophan, ≥99% (HPLC)
Sigma-Aldrich
o-Phenylenediamine, flaked, 99.5%
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 20 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 5 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 4 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 60 mg substrate per tablet
Sigma-Aldrich
DL-Tryptophan, ≥99% (HPLC)
Sigma-Aldrich
o-Phenylenediamine, tablet, 20 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine, Peroxidase substrate, ≥98.0%, powder
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, peroxidase substrate
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 10 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 2 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 3 mg substrate per tablet
Sigma-Aldrich
o-Phenylenediamine dihydrochloride, tablet, 30 mg substrate per tablet
Tryptophan, European Pharmacopoeia (EP) Reference Standard
Sigma-Aldrich
Hematoxylin, certified by the Biological Stain Commission
Sigma-Aldrich
Hematoxylin