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An injectable thermosensitive polymeric hydrogel for sustained release of Avastin® to treat posterior segment disease.
- Source :
-
International Journal of Pharmaceutics . Jul2015, Vol. 490 Issue 1/2, p375-383. 9p. - Publication Year :
- 2015
-
Abstract
- Delivery of drugs, especially bioactive macromolecules such as proteins and nucleic acids, to the posterior segment is still a significant challenge for pharmaceutical scientists. In the present study, we developed an injectable thermosensitive polymeric hydrogel for sustained release of Avastin ® to treat posterior segment disorders. The payload of Avastin ® to poly(lactic acid-co-glycolic acid)-poly(ethylene glycol)-poly(lactic acid-co-glycolic acid) (PLGA-PEG-PLGA) hydrogel did not influence its inherent sol–gel transition behavior, but shifted the sol–gel transition to a lower temperature. The resulting Avastin ® /PLGA-PEG-PLGA hydrogels had a porous structure (pore size, 100 ∼ 150 μm) as determined by scanning electron microcopy (SEM), facilitating sustained Avastin ® release over a period of up to 14 days in vitro . The PLGA-PEG-PLGA hydrogel was immediately formed in the vitreous humor after intravitreal injection, followed by slow clearance over an 8 week study period. The PLGA-PEG-PLGA hydrogel exhibited no apparent toxicity against retinal tissue, as indicated by the absence of inflammation, retinal necrosis, and stress responses, using optical coherence tomography (OCT) and histological/immunochemical analyses. Electrophysiology (ERG) examination also showed that the PLGA-PEG-PLGA hydrogel did not affect retinal function. In vivo pharmacokinetic studies indicated that the use of the PLGA-PEG-PLGA hydrogel greatly extended the release of Avastin ® over time in the vitreous humor and retina after intravitreal injection. Together, these results demonstrated that the PLGA-PEG-PLGA hydrogel was a promising candidate for ocular drug delivery of Avastin ® via intravitreal injection. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03785173
- Volume :
- 490
- Issue :
- 1/2
- Database :
- Academic Search Index
- Journal :
- International Journal of Pharmaceutics
- Publication Type :
- Academic Journal
- Accession number :
- 103425312
- Full Text :
- https://doi.org/10.1016/j.ijpharm.2015.05.071