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2014 ; 47
(6
): 409-18
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1-Methyl-tryptophan synergizes with methotrexate to alleviate arthritis in a
mouse model of arthritis
#MMPMID24798341
Pigott E
; DuHadaway JB
; Muller AJ
; Gilmour S
; Prendergast GC
; Mandik-Nayak L
Autoimmunity
2014[Sep]; 47
(6
): 409-18
PMID24798341
show ga
Rheumatoid arthritis (RA) is an inflammatory autoimmune disease with no known
cure. Current strategies to treat RA, including methotrexate (MTX), target the
later inflammatory stage of disease. Recently, we showed that inhibiting
indoleamine-2,3-dioxygenase (IDO) with 1-methyl-tryptophan (1MT) targets
autoantibodies and cytokines that drive the initiation of the autoimmune
response. Therefore, we hypothesized that combining 1MT with MTX would target
both the initiation and chronic inflammatory phases of the autoimmune response
and be an effective co-therapeutic strategy for arthritis. To test this, we used
K/BxN mice, a pre-clinical model of arthritis that develops joint-specific
inflammation with many characteristics of human RA. Mice were treated with 1MT,
MTX, alone or in combination, and followed for arthritis, autoantibodies, and
inflammatory cytokines. Both 1MT and MTX were able to partially inhibit arthritis
when used individually; however, combining MTX?+?1MT was significantly more
effective than either treatment alone at delaying the onset and alleviating the
severity of joint inflammation. We went on to show that combination of MTX?+?1MT
did not lower inflammatory cytokine or autoantibody levels, nor could the
synergistic co-therapeutic effect be reversed by the adenosine receptor
antagonist theophylline or be mimicked by inhibition of polyamine synthesis.
However, supplementation with folinic acid did reverse the synergistic
co-therapeutic effect, demonstrating that, in the K/BxN model, MTX synergizes
with 1MT by blocking folate metabolism. These data suggest that pharmacological
inhibition of IDO with 1MT is a potential candidate for use in combination with
MTX to increase its efficacy in the treatment of RA.
|Animals
[MESH]
|Antirheumatic Agents/*pharmacology/therapeutic use
[MESH]