改变了palbociclib的分布特征,由其前药物改变了它的分布特征
Juulia Järvinen1, Ahmed B Montaser1, Santosh Kumar Adla1
1School of Pharmacy, University of Eastern Finland, P.O. Box 1627, FI-70211 Kuopio, Finland.
概括
研究人员开发了palbociclib前药物 (PD1,PD2) 来增强用于癌症治疗的大脑输送. 虽然大脑的吸收没有得到改善,但前药物避开了排泄输送器,并显示了未来药物输送策略的有希望的药理学特征.
科学领域:
- 药理学 药理学是指药理学的学科.
- 药物运输 药物运输 药物运输
- 在瘤学瘤学.
背景情况:
- 作为CDK 4/6抑制剂的Palbociclib可以治疗乳腺癌,并可能向质母细胞瘤.
- P-glycoprotein (P-gp) 和BCRP限制了palbociclib对大脑的暴露.
- 新型前期药物旨在克服流量输送器的局限性.
研究的目的:
- 创建和评估palbociclib前药物 (PD1,PD2) 以改善大脑分布.
- 调查前药物是否可以利用LAT1进行增强的血脑屏障 (BBB) 运输.
- 评估这些新型前药的体外,现场和体内疗效.
主要方法:
- 合成了两种palbociclib前药物 (PD1,PD2) 使用氨酸部分.
- 在各种细胞系中评估了LAT1结合和抑制.
- 评估前药物逃避排放载体的能力及其体外吸收.
- 进行了in-situ和in-vivo研究,以确定大脑吸收和药物动力学概况.
主要成果:
- PD1和PD2显示出有限的LAT1结合和抑制.
- 前药物成功地逃避了外流机制,其体外吸收类似于palbociclib.
- 与palbociclib相比,体内研究没有显著增加大脑吸收.
- PD1显示出良好的脑/血AUC比率,PD2显示出长效的药理动力学.
结论:
- 帕尔博西克利布前药物设计没有显著增强大脑输送,可能是由于大小限制.
- 该研究为开发未来的载体向药物输送策略提供了有价值的见解.
- 产物药物显示出潜在的逃避排放输送物和改善药物动力学特征.
相关概念视频
Prodrugs
2.6K
Prodrugs are a class of pharmaceutical compounds that undergo a biotransformation process within the body to be converted into a pharmacologically active drug. Prodrugs are designed to improve the therapeutic properties of the parent drug, such as enhancing bioavailability, increasing stability, or reducing toxicity. The concept of prodrugs revolves around modifying the chemical structure of the original drug to make it more effective or convenient for administration.
Prodrugs help overcome...
Prodrugs help overcome...
2.6K
Drug Biotransformation: Overview
2.4K
Pharmaceutical substances known as xenobiotics are predominantly lipophilic and nonionized. This enables them to permeate lipid bilayers, such as cell membranes, and interact with intracellular target receptors. Lipophilic drugs have an advantage in crossing biological barriers and reaching their intended sites of action. However, lipophilic drugs often have a restricted capacity for renal expulsion or elimination from the body. When these drugs enter the kidneys and undergo glomerular...
2.4K
Drug Distribution: Tissue Binding
2.7K
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.
For...
For...
2.7K
Drug Distribution: Plasma Protein Binding
5.7K
Drugs predominantly attach to plasma proteins, with only a small percentage remaining unbound. The unbound portion can be calculated as one minus the bound fraction. Acidic drugs form large, inactive complexes by reversibly binding to plasma albumin, which prevents them from diffusing across biological barriers. These drug-protein complexes act as reservoirs for the drugs. As the concentration of unbound drugs decreases, these complexes quickly dissociate to release the free drug, maintaining...
5.7K
Nonlinear Pharmacokinetics: Dependence of Elimination Half-Life and Dose Clearance
161
The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
A study on guinea pigs examined the...
A study on guinea pigs examined the...
161
Nonlinear Pharmacokinetics: Bioavailability and Protein-Drug Binding
187
When a drug follows nonlinear pharmacokinetics, its bioavailability, the amount of the drug that reaches the systemic circulation, can change with different doses. This is due to the presence of a saturable pathway. The pathway becomes saturated as the drug concentration increases, decreasing the absorption rate. Consequently, the drug's bioavailability may be lower than expected at higher doses.
To quantify the extent of bioavailability, pharmacologists often use a parameter called .
To quantify the extent of bioavailability, pharmacologists often use a parameter called .
187


