Laser-activated drug implant for controlled release to the posterior segment of the eye
| Autor: | Zheng Yuan, Samantha Gaeke, Xingyu He, Yoonjee C. Park, Winston W.-Y. Kao, Daniel M. Miller, S. Kevin Li, Basil Williams |
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| Rok vydání: | 2020 |
| Předmět: |
Drug
medicine.medical_specialty Proliferative vitreoretinopathy Standard of care media_common.quotation_subject Eye disease Biomedical Engineering Biomaterials Ophthalmology medicine Animals Fluorescent Dyes media_common Drug Implants business.industry Lasers Biochemistry (medical) Capsule General Chemistry Carbocyanines Macular degeneration medicine.disease Controlled release Posterior segment of eyeball Drug Liberation Methotrexate Drug delivery Rabbits Implant business |
| DOI: | 10.1101/2020.06.17.111641 |
| Popis: | The current standard of care for posterior segment eye diseases, such as age-related macular degeneration and diabetic macular edema, is frequent intravitreal injections or sustained-release drug implants. Drug implants have side effects due to the burst release of the drugs, and their release cannot be easily controlled after implantation. Present study attempts to develop a dosage-controllable drug delivery implant which consists of a nanoporous biodegradable PLGA capsule and light-activated liposomes. Controllable drug release from the implant was achieved by using pulsed near-infrared (NIR) laser both in vitro and in vivo. The in vitro drug release kinetics from two different initial dose implants, 1000 μg and 500 μg, was analyzed by fitting zero order and first order kinetics, as well as the Korsmeyer-Peppas and Higuchi models. The 1000 μg and 500 μg implants fit the first-order and zero-order kinetics model, respectively, the best. The multiple drug releases in the vitreous was determined by in vivo fluorimeter, which was consistent with the in vitro data. The dose released was also clinically relevant. Histology and optical and ultrasound imaging data showed no abnormality in the eyes received implant treatment suggesting that the drug delivery system was safe to the retina. This on-demand dose-controllable drug delivery system could be potentially used for long-term posterior eye disease treatment. |
| Databáze: | OpenAIRE |
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