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Published on: March 24, 2015
Interferon-beta affects the tryptophan metabolism in multiple sclerosis patients
A Amirkhani1, C Rajda, B Arvidsson
1Department of Analytical Chemistry, Institute of Chemistry, Biomedical Center, Uppsala University, Uppsala, Sweden.
Tryptophan metabolism, specifically the kynurenine/tryptophan ratio, is altered in multiple sclerosis (MS) patients treated with interferon-beta. This suggests the enzyme indolamine-2,3-dioxygenase plays a role in MS pathogenesis.
Area of Science:
- Neuroimmunology
- Metabolomics
- Biochemistry
Background:
- Tryptophan metabolites are implicated in the pathogenesis of multiple sclerosis (MS).
- Interferon-beta (IFN-beta) is a common treatment for relapsing-remitting MS.
Purpose of the Study:
- To investigate plasma levels of tryptophan and its metabolites in MS patients undergoing IFN-beta treatment.
- To determine the impact of acute and long-term IFN-beta therapy on tryptophan metabolism.
Main Methods:
- Plasma samples from healthy controls and MS patients (acute and long-term IFN-beta treatment) were analyzed.
- Capillary liquid chromatography electrospray ionization tandem mass spectrometry was used to quantify tryptophan, kynurenine, and kynurenic acid.
- The kynurenine/tryptophan (K/T) ratio was calculated.
Main Results:
- Increased kynurenine levels and K/T ratio were observed 24 hours post-initial IFN-beta administration in MS patients compared to healthy controls.
- Long-term IFN-beta treatment was associated with higher K/T ratios at 4 and 12 hours post-administration.
- The elevated K/T ratio suggests induction of indolamine-2,3-dioxygenase (IDO) by IFN-beta.
Conclusions:
- IFN-beta treatment influences tryptophan metabolism in MS patients, potentially by inducing IDO.
- IDO's involvement in inflammatory and neurodegenerative processes highlights its importance in MS pathogenesis.
- Further research into IDO's role in MS is warranted.
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