An HDAC-dependent epigenetic mechanism that enhances the efficacy of the antidepressant drug fluoxetine.

An HDAC-dependent epigenetic mechanism that enhances the efficacy of the antidepressant drug fluoxetine.
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DOI:
10.1038/srep08171
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发表时间:
2015-02-02
期刊:
影响因子:
4.6
通讯作者:
Schmauss C
Schmauss C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Schmauss C

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抑郁症是一种普遍的、使人衰弱的精神疾病。然而,目前处方的抗抑郁药物仅对有限的患者有效。对Balb/c小鼠的研究表明,抑制组蛋白去乙酰化酶(HDAC)可能会增强广泛使用的抗抑郁药物氟西汀的疗效。本研究表明,降低氟西汀处理的Balb/c小鼠的HDAC活性可导致强大的抗抑郁和抗焦虑作用。虽然降低I类HDAC 1和3的活性导致抗抑郁作用,但需要额外抑制II类HDAC才能发挥抗焦虑作用。在氟西汀处理的小鼠中,HDAC抑制剂增加了脑源性神经营养因子(Bdnf)基因启动子3乙酰化组蛋白H4蛋白和RNA聚合酶II的富集,并增加了该启动子的Bdnf转录。在低HDAC活性的氟西汀处理小鼠中,减少Bdnf刺激的原肌球蛋白激酶B受体激活,消除了氟西汀的行为效应,这表明HDAC触发的Bdnf表达的表观遗传刺激对治疗效果至关重要。
Depression is a prevalent and debilitating psychiatric illnesses. However, currently prescribed antidepressant drugs are only efficacious in a limited group of patients. Studies on Balb/c mice suggested that histone deacetylase (HDAC) inhibition may enhance the efficacy of the widely-prescribed antidepressant drug fluoxetine. This study shows that reducing HDAC activity in fluoxetine-treated Balb/c mice leads to robust antidepressant and anxiolytic effects. While reducing the activity of class I HDACs 1 and 3 led to antidepressant effects, additional class II HDAC inhibition was necessary to exert anxiolytic effects. In fluoxetine-treated mice, HDAC inhibitors increased enrichment of acetylated histone H4 protein and RNA polymerase II at promotor 3 of the brain-derived neurotrophic factor (Bdnf) gene and increased Bdnf transcription from this promotor. Reducing Bdnf-stimulated tropomyosin kinase B receptor activation in fluoxetine-treated mice with low HDAC activity abolished the behavioral effects of fluoxetine, suggesting that the HDAC-triggered epigenetic stimulation of Bdnf expression is critical for therapeutic efficacy.
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