咖啡因通过双重抑制ADORA2b信号传递和G6PD活性来降低红细胞储存质量
Monika Dzieciatkowska1, Ariel Hay2, Aaron Issaian1
1Department of Biochemistry and Molecular Genetics, University of Colorado Denver - Anschutz Medical Campus, Aurora, CO.
Haematologica
|September 4, 2025
概括
咖啡因消耗会对红细胞质量和输血的有效性产生负面影响. 捐赠者的咖啡因含量较高与红细胞存储较差以及输血后结果降低相关,特别是在具有特定遗传因素的人群中.
科学领域:
- 血液学
- 代谢学
- 药理学
背景情况:
- 咖啡因是一种被广泛消费的物质,
- 红细胞质量对于有效的输血至关重要.
- 了解影响红细胞储存和功能的因素对于输血医学至关重要.
研究的目的:
- 研究咖啡因对红细胞储存质量和输血结果的影响.
- 确定咖啡因对红细胞影响的代谢和遗传机制.
- 探索咖啡因作为血液输血实践中的可修改因素.
主要方法:
- 对13091名献血者的综合数据进行分析 (REDS RBC-Omics研究).
- 在被召回的捐赠者和饮用咖啡的人体志愿者中进行可复制的测量.
- 使用ADORA2b缺陷的小鼠模型进行机械验证.
- 评估红细胞代谢,氧化应激,透脆弱性和输血功效标志物.
主要成果:
- 捐赠者的高咖啡因水平与红细胞代谢中断,氧化应激增加和透脆弱性有关.
- 在志愿者中,咖啡因的摄入导致了这些代谢障碍.
- 较高的供体咖啡因水平与血液溶解的增加和输血后血红蛋白增加的降低相关,特别是在具有ADORA2b多态度的接受者中.
- 在小鼠模型中证实了ADORA2b缺乏和咖啡因暴露的红细胞代谢受损,抗氧化防御降低,以及输血功效降低.
结论:
- 咖啡因消耗是影响红细胞储存质量和输血结果的重要可变因素.
- 遗传因素 (ADORA2b多态) 与咖啡因相互作用,从而加剧对红细胞的负面影响.
- 结合遗传和暴露因子的代谢干预和精确策略可以提高血液质量和临床结果.
相关概念视频
01:29Drugs Affecting Neurotransmitter Synthesis
1.6K
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,...
1.6K
01:25Adrenergic Agonists: Indirect-Acting Agents
1.8K
Indirect-acting adrenergic agonists potentiate the effects of endogenous catecholamines through different mechanisms without directly binding to adrenoceptors.
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral...
1.8K
01:21Drugs Affecting Neurotransmitter Release or Uptake
1.2K
Certain drugs can affect how neurotransmitters called catecholamines, are released or taken back up in the adrenergic neuron. They can have different effects on the body's sympathetic transmission. Reserpine, a natural compound found in the Rauwolfia shrub, blocks a transporter called vesicular monoamine transporter (VMAT), which leads to a buildup of catecholamines in the cell and reduces sympathetic transmission. Another drug called guanethidine works in multiple ways, including blocking...
1.2K
01:13Insufficient Sleep and Sleep Deprivation
210
Insufficient sleep refers to not getting the recommended amount of sleep for optimal functioning, even if it's just slightly less than needed. Sleep insufficiency may occur due to lifestyle choices, such as staying up late for social events or work, resulting in routinely getting less sleep than required. For example, consistently sleeping 6 hours when the body needs 7-9 hours can lead to cumulative effects on health and well-being.
Sleep deprivation is a more severe form of sleep loss...
Sleep deprivation is a more severe form of sleep loss...
210
01:27Disorders of Erythrocytes
1.2K
Disorders of erythrocytes, or red blood cells (RBCs), include a range of conditions affecting their number, shape, or function.
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
Erythrocyte disorders can be broadly categorized into two main types: anemic and polycythemic conditions.
A low oxygen-carrying capacity of the blood due to the loss, lower production, or destruction of erythrocytes is termed anemia. Hemorrhagic anemia, for example, occurs when bleeding from an external wound or internal ulcer reduces erythrocyte counts.
On the other...
1.2K
01:29Stimulants
311
Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
311