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2015 ; 42
(6
): 1062-74
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E3 Ubiquitin Ligase VHL Regulates Hypoxia-Inducible Factor-1? to Maintain
Regulatory T Cell Stability and Suppressive Capacity
#MMPMID26084024
Lee JH
; Elly C
; Park Y
; Liu YC
Immunity
2015[Jun]; 42
(6
): 1062-74
PMID26084024
show ga
Foxp3(+) regulatory T (Treg) cells play a critical role in immune homeostasis;
however, the mechanisms to maintain their function remain unclear. Here, we
report that the E3 ubiquitin ligase VHL is essential for Treg cell function. Mice
with Foxp3-restricted VHL deletion displayed massive inflammation associated with
excessive Treg cell interferon-? (IFN-?) production. VHL-deficient Treg cells
failed to prevent colitis induction, but converted into Th1-like effector
T cells. VHL intrinsically orchestrated such conversion under both steady and
inflammatory conditions followed by Foxp3 downregulation, which was reversed by
IFN-? deficiency. Augmented hypoxia-inducible factor 1? (HIF-1?)-induced
glycolytic reprogramming was required for IFN-? production. Furthermore, HIF-1?
bound directly to the Ifng promoter. HIF-1? knockdown or knockout could reverse
the increased IFN-? by VHL-deficient Treg cells and restore their suppressive
function in vivo. These findings indicate that regulation of HIF-1? pathway by
VHL is crucial to maintain the stability and suppressive function of Foxp3(+)
T cells.