Kynurenine induces T cell fat catabolism and has limited suppressive effects in vivo.
Kynurenine induces T cell fat catabolism and has limited suppressive effects in vivo.
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DOI：
10.1016/j.ebiom.2021.103734
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发表时间：
2021-12
期刊：
影响因子：
11.1
通讯作者：
Beier UH
中科院分区：
文献类型：
--
作者：
Siska PJ;Jiao J;Matos C;Singer K;Berger RS;Dettmer K;Oefner PJ;Cully MD;Wang Z;QuinnIII WJ;Oliff KN;Wilkins BJ;Christensen LM;Wang L;Hancock WW;Baur JA;Levine MH;Ugele I;Mayr R;Renner K;Zhou L;Kreutz M;Beier UH
L-kynurenine is a tryptophan-derived immunosuppressive metabolite and precursor to neurotoxic anthranilate and quinolinate. We evaluated the stereoisomer D-kynurenine as an immunosuppressive therapeutic which is hypothesized to produce less neurotoxic metabolites than L-kynurenine. L-/D-kynurenine effects on human and murine T cell function were examined in vitro and in vivo (homeostatic proliferation, colitis, cardiac transplant). Kynurenine effects on T cell metabolism were interrogated using [13C] glucose, glutamine and palmitate tracing. Kynurenine was measured in tissues from human and murine tumours and kynurenine-fed mice. We observed that 1 mM D-kynurenine inhibits T cell proliferation through apoptosis similar to L-kynurenine. Mechanistically, [13C]-tracing revealed that co-stimulated CD4+ T cells exposed to L-/D-kynurenine undergo increased β-oxidation depleting fatty acids. Replenishing oleate/palmitate restored effector T cell viability. We administered dietary D-kynurenine reaching tissue kynurenine concentrations of 19 μM, which is close to human kidney (6 μM) and head and neck cancer (14 μM) but well below the 1 mM required for apoptosis. D-kynurenine protected Rag1–/– mice from autoimmune colitis in an aryl-hydrocarbon receptor dependent manner but did not attenuate more stringent immunological challenges such as antigen mismatched cardiac allograft rejection. Our dietary kynurenine model achieved tissue concentrations at or above human cancer kynurenine and exhibited only limited immunosuppression. Sub-suppressive kynurenine concentrations in human cancers may limit the responsiveness to indoleamine 2,3-dioxygenase inhibition evaluated in clinical trials. The study was supported by the NIH, the Else Kröner-Fresenius-Foundation, Laffey McHugh foundation, and American Society of Nephrology.
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影响因子：
19.6
作者：
Levine MH;Wang Z;Xiao H;Jiao J;Wang L;Bhatti TR;Hancock WW;Beier UH
通讯作者：
Beier UH
影响因子：
7.4
作者：
Melamud E;Vastag L;Rabinowitz JD
通讯作者：
Rabinowitz JD
影响因子：
29
作者：
Ma, Eric H.;Bantug, Glenn;Jones, Russell G.
通讯作者：
Jones, Russell G.
影响因子：
6.4
作者：
Hellmann, Matthew D.;Gettinger, Scott;Heist, Rebecca S.
通讯作者：
Heist, Rebecca S.
影响因子：
7.3
作者：
Li L;Huang L;Lemos HP;Mautino M;Mellor AL
通讯作者：
Mellor AL