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2017 ; 8
(ä): 1561
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English Wikipedia
l-Citrulline Metabolism in Mice Augments CD4(+) T Cell Proliferation and Cytokine
Production In Vitro, and Accumulation in the Mycobacteria-Infected Lung
#MMPMID29201027
Lange SM
; McKell MC
; Schmidt SM
; Hossfeld AP
; Chaturvedi V
; Kinder JM
; McAlees JW
; Lewkowich IP
; Way SS
; Turner J
; Qualls JE
Front Immunol
2017[]; 8
(ä): 1561
PMID29201027
show ga
Activation, recruitment, and effector function of T lymphocytes are essential for
control of mycobacterial infection. These processes are tightly regulated in T
cells by the availability of l-arginine within the microenvironment. In turn,
mycobacterial infection dampens T cell responsiveness through arginase induction
in myeloid cells, promoting sequestration of l-arginine within the local milieu.
Here, we show T cells can replenish intracellular l-arginine through metabolism
of l-citrulline to mediate inflammatory function, allowing anti-mycobacterial T
cells to overcome arginase-mediated suppression. Furthermore, T cell l-citrulline
metabolism is necessary for accumulation of CD4(+) T cells at the site of
infection, suggesting this metabolic pathway is involved during
anti-mycobacterial T cell immunity in vivo. Together, these findings establish a
contribution for l-arginine synthesis by T cells during mycobacterial infection,
and implicate l-citrulline as a potential immuno-nutrient to modulate host
immunity.