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Evaluation of N-succinyl-chitosan as a systemic long-circulating polymer
1Department of Clinical Pharmacy, Hoshi University, Tokyo, Japan. d711@hoshi.ac.jp
Biomaterials
|July 8, 2000
Summary
N-succinyl-chitosan (Suc-chitosan), a biodegradable polymer, demonstrates prolonged circulation in mice, with significant tumor accumulation. Its elimination pathway requires further investigation beyond urinary excretion.
Area of Science:
- Biomaterials Science
- Pharmacokinetics
- Drug Delivery
Background:
- Chitosan derivatives offer potential for biomedical applications due to their tunable properties.
- N-succinyl-chitosan (Suc-chitosan) is a water-soluble, low-toxicity derivative with reduced biodegradability.
- Understanding the long-term body distribution and excretion of such derivatives is crucial for their therapeutic development.
Purpose of the Study:
- To investigate the long-term body distribution and urinary excretion of N-succinyl-chitosan (Suc-chitosan) after intravenous injection.
- To evaluate the pharmacokinetic profile and tissue distribution of fluorescein isothiocyanate-labeled Suc-chitosan (Suc-chitosan-FTC) in normal and tumor-bearing mice.
- To compare the circulation half-life and tumor accumulation of Suc-chitosan-FTC with other long-circulating macromolecules.
Main Methods:
- Fluorescein isothiocyanate (FITC) labeling of N-succinyl-chitosan.
- Characterization of labeled Suc-chitosan-FTC for molecular weight, succinylation degree, and FTC content.
- Intravenous administration of Suc-chitosan-FTC to normal and Sarcoma 180 tumor-bearing mice.
- Long-term monitoring of plasma concentration, tissue distribution, and urinary excretion over 72 hours.
Main Results:
- Suc-chitosan-FTC exhibited prolonged systemic retention, with plasma half-lives of 100.3 h (normal mice) and 43.0 h (tumor-bearing mice), exceeding those of previously reported macromolecules.
- Significant accumulation of Suc-chitosan-FTC was observed in tumors, reaching approximately 10% at 48 hours post-injection.
- Minimal distribution into tissues other than blood circulation and the tumor was noted.
- Urinary excretion did not increase significantly beyond 24 hours, suggesting alternative elimination routes.
Conclusions:
- N-succinyl-chitosan demonstrates exceptional long-circulating properties and tumor-targeting potential.
- The primary elimination pathway for Suc-chitosan-FTC appears to be independent of urinary excretion, warranting further investigation.
- These findings support the potential of Suc-chitosan as a long-circulating carrier for drug delivery, particularly for tumor targeting.