Oral squamous dysplasia, which can usually be readily visualized as leukoplakia during an oral examination and confirmed by histology, is often considered a premalignant condition. Current treatments, however, focus on the final stages of disease, and treatments such as surgery can lead to postoperative disabilities. Hence, this study was designed to develop a noninvasive, mucoadhesive drug delivery system loaded with an immune response modifier, imiquimod, as a treatment for precancerous dysplastic lesions. Blends of polyvinylpyrrolidone and carboxymethylcellulose were used to prepare mucoadhesive films that were backed with poly(ethylene-co-vinyl acetate). Because of the hydrophobic nature of imiquimod, four loading methods (sonication, linoleic acid, 2-hydroxypropyl-β-cyclodextrin, and acetate buffer) were compared. The formation of imiquimod-cyclodextrin complexes and their solubility was studied by differential scanning calorimetry and phase solubility studies. All films achieved sustained release of drug for 3 h except those prepared by linoleic acid. The high solubility of imiquimod in acetate buffer facilitated high loading capacity and greater release (68%) of drug than did the other formulations (approximately 40%). In summary, a noninvasive and local approach with the potential to treat precancerous lesions may be achieved by this described mucoadhesive drug delivery system.
|Number of pages||11|
|Journal||Journal of Pharmaceutical Sciences|
|State||Published - Feb 2013|
Bibliographical noteFunding Information:
This work was supported in part by the National Institutes of Health (DE019645) and Kentucky NASA EPSCoR (NNX08BA13A). The authors thank Dr. Heidi Mansour (University of Kentucky College of Pharmacy) for assistance with DSC measurements and gratefully recognize the contributions of Mr. J.D. Christensen and Ms. Laynie Boland toward early development of the films.
- Controlled release/delivery
- Mucosal drug delivery
- Oral cancer
- Polymeric drug carrier
ASJC Scopus subject areas
- Pharmaceutical Science