以L-氨酸为向的前额皮层通过肠-短链脂肪酸-大脑轴改善CUMS诱导的抑郁症
Ying Peng1,2, Tianxing Yu1,2, Chunyin Qin1,2
1State Key Laboratory of Tea Plant Germplasm Innovation and Resource Utilization, School of Tea Science, Anhui Agricultural University, Hefei, China.
NPJ science of food
|December 1, 2025
概括
通过改善肠道屏障功能和减少炎症,L-theanine可以缓解抑郁症. 这是通过调节肠道微生物群和肠-大脑轴中的短链脂肪酸 (SCFA) 来实现的.
科学领域:
- 神经科学是一个神经科学.
- 胃肠病学 胃肠病学
- 药理学 药理学是指药理学的学科.
背景情况:
- 抑郁症是全球重要的健康问题.
- 由于其穿透大脑,抗炎和抗氧化作用,L-甲在治疗抑郁症方面表现有前途.
- 在L-theanine抗抑郁作用背后的精确机制需要进一步阐明.
研究的目的:
- 为了研究L-theanine在抑郁症小鼠模型中的治疗机制.
- 探索肠-大脑轴,肠道微生物群和短链脂肪酸 (SCFA) 在L-theanine抗抑郁作用中的作用.
主要方法:
- 一个慢性不可预测的轻度压力 (CUMS) 鼠标模型被用来诱导类似抑郁的行为.
- 研究人员分析了血清中神经递质水平,前额叶皮层 (PFC) 和结肠屏障完整性 (ZO-1,Occludin),肠-大脑炎症通路 (TLR9/NLRP3/Caspase-1),肠道微生物群组成和SCFA水平.
- 小鼠接受了L-theanine (800 mg/kg) 的治疗.
主要成果:
- CUMS引发了抑郁行为,降低了神经递质,并损害了PFC和结肠屏障功能.
- 乙氨酸治疗逆转了这些影响,降低了炎症途径的调节,并恢复了屏障完整性.
- 治疗效果与L-theanine诱导的肠道微生物群变化 (增加的乳酸菌和斑菌) 相关,并恢复了SCFA合成和受体功能.
结论:
- 通过调节肠-大脑轴,L-氨酸显示出抗抑郁作用.
- 关键机制包括恢复肠道屏障完整性,减少神经炎症,改变肠道微生物群组成和SCFA生产.
- 肠-SCFA-大脑轴代表了L-theanine在抑郁症治疗中的潜在治疗途径.
相关概念视频
G-protein Coupled Receptors
131.3K
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
131.3K
Long-term Depression
3.0K
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
Calcium Ion Concentration Mechanism
If over...
Calcium Ion Concentration Mechanism
If over...
3.0K
Long-term Depression
33.0K
Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
33.0K
Depression: Overview
750
Depression is a prevalent mental illness marked by persistent sadness and lack of interest in previously enjoyable activities. It can take several forms, including major depression, persistent depressive disorder, and bipolar I and II disorders. Symptoms range from emotional changes like chronic worry to physical changes like sleep disturbances and suicidal thoughts. From a neurobiological perspective, depression is believed to be triggered by abnormalities in the brain's prefrontal cortex,...
750
Drugs Affecting GI Tract Motility: Serotonin Receptor Agonists
857
Serotonin, a crucial neurotransmitter synthesized by enterochromaffin cells, plays a cardinal role in regulating gastrointestinal (GI) motility. With over 90% of the body's total serotonin in the GI tract, its influence on digestive processes is profound. Serotonin is swiftly released upon various stimuli, such as food boluses or certain drugs, triggering intrinsic sensory neurons in the myenteric plexus and extrinsic vagal and spinal sensory neurons. This leads to the activation of the...
857
Antidepressant Drugs: MAOIs and Other Agents
774
Atypical antidepressants, including bupropion (Wellbutrin), mirtazapine (Remeron), nefazodone (Serzone), trazodone (Desyrel), and vilazodone (Viibryd), offer unique mechanisms of action. Bupropion weakly inhibits dopamine and norepinephrine reuptake, aiding depression treatment and smoking cessation, with a low risk of sexual dysfunction. Mirtazapine enhances serotonin and norepinephrine neurotransmission, leading to sedation, increased appetite, and weight gain. As a result, it helps treat...
774


