Tolerogenic effects of 1,25-dihydroxyvitamin D on dendritic cells involve induction of fatty acid synthesis.

Tolerogenic effects of 1,25-dihydroxyvitamin D on dendritic cells involve induction of fatty acid synthesis.
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DOI:
10.1016/j.jsbmb.2021.105891
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发表时间:
2021-07
期刊:
The Journal of steroid biochemistry and molecular biology
影响因子:
--
通讯作者:
Hewison M
Hewison M
中科院分区:
其他
文献类型:
--
作者:
Garcia AM;Bishop EL;Li D;Jeffery LE;Garten A;Thakker A;Certo M;Mauro C;Tennant DA;Dimeloe S;Evelo CT;Coort SL;Hewison M

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单独用1,25-二羟基维生素D(1,25 D)处理的树突状细胞(DC)显示出致耐受性DC表型。1,25 D处理的DC显示改变的氧化磷酸化和电子传递。1,25 D处理的DC显示糖酵解和TCA循环代谢改变。1,25 D的TCA效应增强DC的脂肪酸合成。脂肪酸的合成似乎是必不可少的DC耐受性的影响,1,25 D。维生素D的活性形式,1,25-二羟基维生素D(1,25 D)是免疫功能的有效调节剂,通过调节树突状细胞(DC)的抗原呈递来促进抗炎、致耐受性T细胞应答。转录组学分析表明,DC对1,25 D的反应涉及糖酵解、氧化磷酸化、电子传递和TCA循环的变化。为了确定1,25 D介导的代谢重塑的功能影响,将人单核细胞衍生的DC分化为不成熟的(+媒介物,iDC)、成熟的(+LPS,mDC)和不成熟的致耐受性DC(+1,25 D,itolDC),并表征代谢功能。与未显示呼吸变化的mDC相反,itolDC显示相对于iDC增加的基础和ATP相关的呼吸。使用13 C标记的葡萄糖进行的示踪代谢物分析显示乳酸和TCA循环代谢物增加。13 C-葡萄糖的亲脂代谢物的分析揭示了标记物在棕榈酸酯和棕榈油酸酯中的显著掺入,表明1,25 D促进itolDC中的代谢脂肪酸合成。itolDC中脂肪酸合成的抑制改变了itolDC的形态,并抑制了这些细胞的CD 14和IL-10的表达。这些数据表明,1,25 D诱导致耐受性DC的能力涉及导致脂肪酸合成的代谢重塑。
Dendritic cells (DC) treated with 1,25-dihydroxyvitamin D (1,25D) alone show a tolerogenic DC phenotype. 1,25D-treated DC show altered oxidative phosphorylation and electron transport. 1,25D-treated DC show altered glycolysis and TCA cycle metabolism. TCA effects of 1,25D enhance fatty acid synthesis by DC. Fatty acid synthesis appears to be essential for DC tolerogenic effects of 1,25D. The active form of vitamin D, 1,25-dihydroxyvitamin D (1,25D) is a potent regulator of immune function, promoting anti-inflammatory, tolerogenic T cell responses by modulating antigen presentation by dendritic cells (DC). Transcriptomic analyses indicate that DC responses to 1,25D involve changes in glycolysis, oxidative phosphorylation, electron transport and the TCA cycle. To determine the functional impact of 1,25D-mediated metabolic remodelling, human monocyte-derived DC were differentiated to immature (+vehicle, iDC), mature (+LPS, mDC), and immature tolerogenic DC (+1,25D, itolDC) and characterised for metabolic function. In contrast to mDC which showed no change in respiration, itolDC showed increased basal and ATP-linked respiration relative to iDC. Tracer metabolite analyses using 13C -labeled glucose showed increased lactate and TCA cycle metabolites. Analysis of lipophilic metabolites of 13C-glucose revealed significant incorporation of label in palmitate and palmitoleate, indicating that 1,25D promotes metabolic fatty acid synthesis in itolDC. Inhibition of fatty acid synthesis in itolDC altered itolDC morphology and suppressed expression of CD14 and IL-10 by these cells. These data indicate that the ability of 1,25D to induce tolerogenic DC involves metabolic remodelling leading to synthesis of fatty acids.
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