Preclinical Neuropsychiatry Laboratory, Neuroscience Research Australia, Randwick, New South Wales, 2031, Australia; Discipline of Psychiatry & Mental Health, Faculty of Medicine, University of New South Wales, Sydney, New South Wales, 2052, Australia.
Schizophrenia Research Laboratory, Neuroscience Research Australia, Randwick, New South Wales, 2031, Australia.
J Psychiatr Res. 2024 Sep;177:118-128. doi: 10.1016/j.jpsychires.2024.07.004. Epub 2024 Jul 4.
Stress and inflammation are risk factors for schizophrenia. Chronic psychosocial stress is associated with subcortical hyperdopaminergia, a core feature of schizophrenia. Hyperdopaminergia arises from midbrain neurons, leading us to hypothesise that changes in stress response pathways may occur in this region. To identify whether transcriptional changes in glucocorticoid and mineralocorticoid receptors (NR3C1/GR, NR3C2/MR) or other stress signalling molecules (FKBP4, FKBP5) exist in schizophrenia midbrain, we measured gene expression in the human brain (N = 56) using qRT-PCR. We assessed whether alterations in these mRNAs were related to previously identified high/low inflammatory status. We investigated relationships between stress-related transcripts themselves, and between FKBP5 mRNA, dopaminergic, and glial cell transcripts in diagnostic and inflammatory subgroups. Though unchanged by diagnosis, GR mRNA levels were reduced in high inflammatory compared to low inflammatory schizophrenia cases (p = 0.026). We found no effect of diagnosis or inflammation on MR mRNA. FKBP4 mRNA was decreased and FKBP5 mRNA was increased in schizophrenia (p < 0.05). FKBP5 changes occurred in high inflammatory (p < 0.001), whereas FKBP4 changes occurred in low inflammatory schizophrenia cases (p < 0.05). The decrease in mRNA encoding the main stress receptor (GR), as well as increased transcript levels of the stress-responsive negative regulator (FKBP5), may combine to blunt the midbrain response to stress in schizophrenia when neuroinflammation is present. Negative correlations between FKBP5 mRNA and dopaminergic transcripts in the low inflammatory subgroup suggest higher levels of FKBP5 mRNA may also attenuate dopaminergic neurotransmission in schizophrenia even when inflammation is absent. We report alterations in GR-mediated stress signalling in the midbrain in schizophrenia.
应激和炎症是精神分裂症的风险因素。慢性心理社会应激与皮质下多巴胺能亢进有关,这是精神分裂症的核心特征。多巴胺能亢进源于中脑神经元,这使我们假设应激反应途径的变化可能发生在该区域。为了确定糖皮质激素和盐皮质激素受体(NR3C1/GR、NR3C2/MR)或其他应激信号分子(FKBP4、FKBP5)的转录变化是否存在于精神分裂症的中脑中,我们使用 qRT-PCR 测量了人类大脑(N=56)中的基因表达。我们评估了这些 mRNA 的改变是否与先前确定的高/低炎症状态有关。我们研究了应激相关转录本本身之间的关系,以及 FKBP5 mRNA、多巴胺能和神经胶质细胞转录本之间在诊断和炎症亚组中的关系。尽管诊断未改变,但与低炎症精神分裂症病例相比,高炎症精神分裂症病例中的 GR mRNA 水平降低(p=0.026)。我们没有发现诊断或炎症对 MR mRNA 的影响。FKBP4 mRNA 减少,FKBP5 mRNA 在精神分裂症中增加(p<0.05)。FKBP5 的变化发生在高炎症时(p<0.001),而 FKBP4 的变化发生在低炎症精神分裂症病例中(p<0.05)。主要应激受体(GR)的 mRNA 减少,以及应激反应负调节剂(FKBP5)的转录水平增加,可能会在神经炎症存在时使精神分裂症的中脑对应激的反应迟钝。在低炎症亚组中,FKBP5 mRNA 与多巴胺能转录本之间的负相关表明,即使在没有炎症的情况下,FKBP5 mRNA 水平较高也可能会减弱精神分裂症中的多巴胺能神经传递。我们报告了精神分裂症中脑 GR 介导的应激信号转导的改变。