Kinetics of Drug Penetration Across the Cornea at a Microscopic Level

微观水平上药物穿过角膜的渗透动力学

基本信息

批准号：
7511172
负责人：
SANGLY P SRINIVAS
金额：
$ 22.54万
依托单位：
TRUSTEES OF INDIANA UNIVERSITY
依托单位国家：
美国
项目类别：
财政年份：
2008
资助国家：
美国
起止时间：
2008-09-01 至 2010-08-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/7511172
关键词：
Abbreviations Chemicals Computer Assisted Confocal Microscopy Cornea Custom Data Depth Development Diffusion Drug Administration Routes Drug Design Drug Kinetics Drug Transport Endothelium Epithelial Exhibits Eye Fluorescein Fluoresceins Fluorescence Fluorescence Microscopy Goals Heterogeneity In Vitro Investigation Lead Measures Microscopic Microscopy Modeling Molecular Structure Molecular Weight Oryctolagus cuniculus Other Routes of Drug Administration Penetration Pharmaceutical Preparations Physiological Principal Investigator Public Health Range Scanning Series Skin Spottings Structure Techniques Thick Time Tissues Topical application Treatment Protocols Validation analog anterior chamber base chemical property design dosage in vivo insight instrument ionization knowledge base lipophilicity member molecular modeling monolayer novel pharmacokinetic model programs research study stem

项目摘要

DESCRIPTION (provided by applicant): Kinetics of Drug Penetration across the Cornea at a Microscopic Level Drugs applied topically to the eye access the intraocular tissues predominantly by penetration across the multi-layered cornea, consisting of a stratified epithelial layer, a thick collagenous stroma and a leaky monolayer of endothelium. Previous studies on topical drug kinetics to the eye have focused mainly on compartmental modeling of transport across the cornea. Such models have disregarded the inherent heterogeneity in the cornea, rendering them incapable of making sufficiently accurate predictions. The disregard for the heterogeneity in the cornea stems from the fact that experimental transcorneal concentration profiles of drugs are unavailable and difficult to obtain. Accordingly, only the average values of the drugs in the cornea, which are usually measured, have been employed in the development of pharmacokinetic modeling of topical drugs to the eye. This project will employ a novel custom-built confocal scanning microfluorometer to measure transcorneal profiles of a series of fluorescent compounds employed as drug analogs across rabbit cornea mounted in vitro. The resulting transcorneal concentration profiles will be employed to develop a phenomenologically-based non-compartmental pharmacokinetic model. The resulting model will then be employed to predict pharmacokinetics for topical administration of the fluorescent drug analogs. These predictions will be compared with in vivo data, which will be obtained for the same fluorescent compounds using another custom-built ocular spot-fluorometer. The latter instrument can measure average fluorescence from the cornea and anterior chamber. Overall, the results from this project involving in vivo and in vitro experiments is expected to yield detailed mechanistic understanding of topical drug kinetics and eventually enable rational drug design as well as the development of optimal drug dosage regimen. PUBLIC HEALTH RELEVANCE: More than 90% of the drugs to the eye are administered by topical administration. In this project, we propose to investigate how the topically administered drugs penetrate across the cornea into the eye. We expect to obtain a mechanistic understanding of the penetration, which is needed for rational drug design and optimal design of dosage regimen.

描述（由申请人提供）：微观水平上药物穿过角膜的渗透动力学局部施用于眼睛的药物主要通过穿过多层角膜进入眼内组织，角膜由复层上皮层、厚的胶原基质和渗漏的单层内皮细胞。先前对眼睛局部药物动力学的研究主要集中在穿过角膜的运输的区室模型上。这些模型忽视了角膜固有的异质性，导致它们无法做出足够准确的预测。对角膜异质性的忽视源于这样一个事实：药物的实验性经角膜浓度分布不可用且难以获得。因此，在开发眼睛局部药物的药代动力学模型时，仅采用通常测量的角膜中药物的平均值。该项目将采用新型定制共焦扫描微荧光计来测量一系列荧光化合物的经角膜轮廓，这些荧光化合物用作体外安装的兔角膜上的药物类似物。由此产生的经角膜浓度分布将用于开发基于现象学的非房室药代动力学模型。然后，所得模型将用于预测荧光药物类似物局部给药的药代动力学。这些预测将与体内数据进行比较，体内数据将使用另一个定制的眼部点荧光计获得相同的荧光化合物。后一种仪器可以测量来自角膜和前房的平均荧光。总体而言，该项目涉及体内和体外实验的结果预计将产生对局部药物动力学的详细机制理解，并最终实现合理的药物设计以及最佳药物剂量方案的开发。公共卫生相关性：90% 以上的眼部药物都是通过局部给药的。在这个项目中，我们建议研究局部给药的药物如何穿过角膜进入眼睛。我们期望获得对渗透的机制了解，这是合理的药物设计和最佳剂量方案设计所必需的。