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相关概念视频

Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
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Pharmacokinetics in Pediatric Patients: Drug Distribution01:17

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Drug distribution in the pediatric population exhibits unique challenges and considerations due to the physiological differences between children, particularly neonates and infants, and adults. A crucial aspect of pediatric pharmacology is understanding how these differences impact the pharmacokinetics of various drugs, necessitating age-specific dosing strategies to ensure efficacy and safety.Neonates and infants have a higher total body water content, ~75%–90% of their body weight,...
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Pharmacokinetics is a vital branch of pharmacology that examines how drugs are absorbed, distributed, metabolized, and excreted by the body. Two key methodologies in pharmacokinetics are plasma drug concentration studies and urinary drug excretion analyses, both of which provide critical insights into a drug's therapeutic efficacy and bioavailability.Plasma Drug Concentration-Time StudiesPlasma drug concentration-time studies involve analyzing blood samples at specific intervals to quantify...
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Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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Pharmacokinetics is a scientific discipline that focuses on the journey of a drug within the body, encompassing four key stages: absorption, distribution, metabolism, and elimination. The first stage, absorption, involves the drug's transfer into the bloodstream. Several factors dictate the extent and speed of this process. For example, the liver often metabolizes oral drugs before they reach systemic circulation, leading to only partial absorption. In contrast, intravenous (IV)...
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The two-compartment model divides the body into central and peripheral compartments to account for varying blood perfusion rates among organs and tissues, affecting drug distribution. The central compartment includes blood and highly perfused tissues with rapid drug distribution, while the peripheral compartment contains tissues with slower drug distribution. After a single IV bolus dose, the drug concentration is high in plasma and low in tissues. The drug distribution between compartments...
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Investigations on the GaIII Complex of EOB-DTPA and Its 68Ga Radiolabeled Analogue
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三OXO71 在 rhesus macaques 中的药理动力学和分布.

Christopher D Kroenke1, Irene Canavesi2, Jenna N Castro3

  • 1Division of Neuroscience, Oregon National Primate Research Center, Oregon Health & Science University, Beaverton, Oregon, USA.

Magnetic resonance in medicine
|December 16, 2025
PubMed
概括

使用三基OXO71的电子磁共振氧成像 (EPROI) 在 rhesus macaques 中是安全的. 这项研究为优化人类EPROI提供了关键的药理动力学和组织分布数据.

关键词:
电子的偏磁共振是一种超磁共振.非人类灵长类的灵长类.氧气成像成像技术 氧气成像药物动力学 药物动力学这是一种三基的激进分子.

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科学领域:

  • 生物医学成像技术 生物医学成像技术
  • 医学物理 医学物理
  • 药理学 药理学是指药理学的学科.

背景情况:

  • 电子磁共振氧成像 (EPROI) 在体内量化氧的部分压力 (pO2).
  • OXO71是EPROI中使用的三基,在小动物研究中先前有过应用.
  • 将EPROI转化为人类使用需要在类似于人类的大型动物模型中进行优化.

研究的目的:

  • 在 rhesus macaques 中静脉注射后描述 OXO71 的药理动力学.
  • 为了确定OXO71在 rhesus的组织分布.
  • 在灵长类动物模型中评估OXO71对EPROI的安全性和可行性.

主要方法:

  • 三只 rhesus 在10分钟内接受了92μmol/kg OXO71的静脉注射.
  • 在注射后2小时内收集血和尿液样本.
  • 在第二剂后,动物被安乐死,并使用EPR成像评估组织分布.

主要成果:

  • 血OXO71表现出双相清除,初始和终端半衰期分别为12.4 ± 1.2 分钟和67.7 ± 8.9 分钟.
  • 在大多数组织中发现了可观的OXO71度,除了大脑.
  • 没有观察到任何不良的生理影响,表明毒性低.

结论:

  • 使用OXO71的EPROI是安全的,并且在灵长类动物中耐受良好.
  • 药理动力学和组织分布数据为大型动物和人类提供EPROI的剂量和时间.
  • 这些发现支持进一步开发基于OXO71的EPROI用于临床应用.