Clin Epigenetics:口服维生素C可恢复血液恶性肿瘤患者的血浆维生素C的水平

2020-10-05 MedSci原创 MedSci原创

血液恶性肿瘤患者往往缺乏维生素C,而维生素C对于TET诱导的5-甲基胞嘧啶(5mC)向5-羟甲基胞嘧啶(5hmC)的转化至关重要,这是活性DNA去甲基化的第一步。在此,我们研究口服维生素C补充剂是否可

血液恶性肿瘤患者往往缺乏维生素C,而维生素C对于TET诱导的5-甲基胞嘧啶(5mC)向5-羟甲基胞嘧啶(5hmC)的转化至关重要,这是活性DNA去甲基化的第一步。在此,我们研究口服维生素C补充剂是否可以纠正使用DNA甲基转移酶抑制剂(DNMTis)治疗的骨髓癌患者的维生素C缺乏症并影响5hmC / 5mC比率。

我们在丹麦骨髓癌患者中进行了一项随机、双盲、安慰剂对照的试验(NCT02877277),在DNMTi治疗的3个周期(5-氮杂环丁,100mg/m2/d,5天,28天周期)中进行,在最后2个周期中每天口服500mg维生素C(n=10)或安慰剂(n=10)补充剂。

 

结果显示,14名患者(70%)血浆维生素C不足(<23μM),其余6名患者中有4名在纳入时正在服用维生素补充剂。严重缺乏维生素C的患者的整体DNA甲基化显著较高(<11.4μM;相对于脱氧鸟苷,4.997 vs 4.656% 5mC,95% CI [0.126,0.556],P = 0.004)。口服补充剂使维生素C组的所有患者的血浆维生素C水平恢复到正常范围(平均增加34.85±7.94μM,P = 0.0004)。我们首次显示,与安慰剂相比,接受口服维生素C的患者单核骨髓细胞中的总体5hmC/5mC水平显著增加(0.037% vs - 0.029%,95% CI [- 0.129,- 0.003],P = 0.041)。

综上所述,该研究结果表明,与安慰剂组的患者相比,通过口服补充维生素C使血浆维生素C的水平正常化,导致5hmC/5mC比值增加,可能会增强DNMTis的生物效应。口服维生素C补充DNMTis的临床疗效应进行大型随机、安慰剂对照的临床试验以进一步研究。

 

原始出处:

 

Linn GillbergAndreas D Ørskov, et al., Oral vitamin C supplementation to patients with myeloid cancer on azacitidine treatment: Normalization of plasma vitamin C induces epigenetic changes. Clin Epigenetics. 2019 Oct 17;11(1):143. doi: 10.1186/s13148-019-0739-5.

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    2021-03-21 huperzia
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    2020-12-09 canlab
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    2021-05-25 cy0324
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    2020-10-06 zhenjiu124

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