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Arterial paclitaxel distribution and deposition
C J Creel1, M A Lovich, E R Edelman
1Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Circulation Research
|April 29, 2000
Summary
Paclitaxel, a hydrophobic drug, shows strong binding within arterial walls, exceeding applied concentrations. This unique property is crucial for its potential in treating vascular diseases.
Area of Science:
- Vascular Biology
- Pharmacology
- Drug Delivery
Background:
- Local arterial drug delivery necessitates transmural distribution.
- Physicochemical properties significantly influence drug transport and tissue binding.
- Hydrophobic drugs like paclitaxel may offer prolonged therapeutic effects due to tissue binding.
Purpose of the Study:
- To investigate the arterial transport and transmural distribution of paclitaxel.
- To determine if paclitaxel's physicochemical properties contribute to its efficacy in preclinical studies.
- To understand the pharmacokinetic complexity of paclitaxel for vascular disease treatment.
Main Methods:
- Ex vivo arterial drug application of paclitaxel.
- Measurement of paclitaxel's transmural distribution across the arterial wall.
- Quantification of arterial paclitaxel deposition over time (15 minutes to 4 hours).
Main Results:
- Paclitaxel deposition in the arterial wall exceeded the applied concentration.
- Permeation into the arterial wall increased over time and varied by delivery origin.
- Transport rates were markedly slower compared to hydrophilic compounds.
- Endovascular and perivascular application resulted in differential deposition patterns.
Conclusions:
- Paclitaxel exhibits complex pharmacokinetics, interacting with arterial tissue elements.
- Substantial partitioning and spatial gradients of paclitaxel exist across the arterial wall.
- Further investigation is required to optimize paclitaxel's clinical use in proliferative vascular diseases.