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Drugs Affecting Neurotransmitter Synthesis01:29

Drugs Affecting Neurotransmitter Synthesis

Drugs affecting neurotransmitter synthesis can impact the adrenergic neuron and the synthesis of neurotransmitters. For example, α-methyltyrosine and carbidopa target specific enzymes involved in catecholamine synthesis. α-methyltyrosine inhibits the enzyme tyrosine hydroxylase, which converts tyrosine into dopamine. By blocking this enzyme, α-methyltyrosine reduces dopamine production and other catecholamines. Carbidopa, on the other hand, inhibits the enzyme dopa decarboxylase, which converts...
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Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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Neurotransmitters are integral to the brain's communication system, enabling neurons to transmit signals across synapses. This chemical exchange underpins various cognitive functions, including memory processes. The role of neurotransmitters in memory is multifaceted, influencing the encoding, consolidation, and retrieval of memories through their action on different neural circuits.
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Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
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DefinitionHepatic encephalopathy is a reversible neurologic syndrome that results from advanced liver dysfunction or portosystemic shunting. It leads to disturbances in cognition, behavior, and motor function due to the brain’s exposure to gut-derived toxins that the liver fails to detoxify.EtiologyThis condition develops either in the setting of acute fulminant hepatitis or progressively during chronic liver disease, such as cirrhosis and portal hypertension. Portosystemic shunting—including...

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由于外周胆固醇代谢物27-基胆固醇的作用而损害了星细胞突触功能.

Fokion Spanos1, Gorka Gerenu1,2,3, Julen Goikolea1

  • 1Department of Neurobiology Care Sciences and Society, Division of Neurogeriatrics, Karolinska Institutet, Center for Alzheimer Research, Stockholm, Sweden.

Frontiers in cellular neuroscience
|April 23, 2024
PubMed
概括
此摘要是机器生成的。

高水平的27-胆固醇 (27-OH) 损害了星球细胞功能和谷氨酸运输体表达,导致阿尔茨海默病 (AD) 中的突触功能障碍. 这项研究揭示了一种新的机制,将大脑氧胆固醇失衡与AD病理联系起来.

关键词:
这是一种27-基胆固醇.3D共文化系统 3D共文化系统阿尔茨海默氏症是阿尔茨海默氏症的一种疾病.星球细胞是星球细胞.胆固醇的代谢 胆固醇的代谢神经球体类神经球体突触功能障碍 突触功能障碍

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科学领域:

  • 神经科学是一个神经科学.
  • 细胞生物学 细胞生物学
  • 生物化学 生物化学

背景情况:

  • 星球细胞对大脑功能至关重要,包括突触传输和认知.
  • 阿尔茨海默病 (AD) 与胆固醇代谢失衡有关,特别是高水平的27-基胆固醇 (27-OH).
  • 27-OH对天体细胞功能的影响在很大程度上仍然不清楚.

研究的目的:

  • 为了研究27-OH水平升高对天体细胞功能in vivo和in vitro的影响.
  • 探索天体细胞功能障碍在27-OH诱导的突触缺陷中的作用.
  • 为了确定氧胆固醇失衡和AD中神经退行症之间的联系.

主要方法:

  • 使用Cyp27Tg小鼠,用于大脑氧胆固醇失衡的模型.
  • 给野生型 (WT) 小鼠提供高胆固醇饮食.
  • 为实验室研究开发了小鼠胚胎细胞的3D共同培养系统.
  • 评估了天体细胞功能,谷氨酸转运体表达 (GLT-1,GLAST) 和GFAP水平.

主要成果:

  • 在Cyp27Tg小鼠的海马体中增加的27-OH降低了天体细胞功能in vivo和下调的谷氨酸转运体 (GLT-1).
  • 高胆固醇饮食也导致了WT小鼠的GLT-1下调.
  • 3D共同培养揭示了27-OH诱导的天体细胞退化和谷氨酸载体下调 (GLT-1,GLAST),这在2D培养中没有看到的效果.
  • 谷氨酸转运体的下调表明神经元潜在的过度兴奋和突触功能障碍.

结论:

  • 增加的27-OH会损害星细胞功能和谷氨酸运输体表达,导致突触功能障碍.
  • 通过天体细胞失调的氧化失衡,代表了阿尔茨海默氏症病原体的新机制.
  • 3D共同培养系统有效地模拟了27-OH诱导的天体细胞和突触缺陷,为进一步研究提供了一个平台.