Evaluation of polyesteramide (PEA) and polyester (PLGA) microspheres as intravitreal drug delivery systems in albino rats



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Peters, Tobias and Kim, Seong-Woo and Castro, Vinicius and Stingl, Krunoslav and Strasser, Torsten and Bolz, Sylvia and Schraermeyer, Ulrich and Mihov, George and Zong, MengMeng and Andrés Guerrero, Vanessa and Herrero Vanrell, Rocío and Dias, Aylvin and Cameron, Neil and Zrenner, Eberhart (2017) Evaluation of polyesteramide (PEA) and polyester (PLGA) microspheres as intravitreal drug delivery systems in albino rats. Biomaterials, 124 . pp. 157-168. ISSN 0142-9612

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Official URL: http://doi.org/10.1016/j.biomaterials.2017.02.006


Purpose: To study the suitability of injectable microspheres based on poly(ester amide) (PEA) or poly lactic-co-glycolic acid (PLGA) as potential vehicles for intravitreal drug delivery in rat eyes. Dexamethasone loaded PEA microspheres (PEA+DEX) were also evaluated.
Methods: Forty male Sprague Dawley rats were divided into four groups that received different intravitreally injected microspheres: PEA group (n=12); PLGA group (n=12); PEA+DEX group (n=8); and control group (no injection, n=8). Electroretinography (ERG), fundus autofluorescence (FAF), and spectral domain optical coherence tomography (sdOCT) were performed at baseline, weeks 1 and 2, and months 1, 2, and 3 after intravitreal injection. Eyes were histologically examined using light microscopy and transmission electron microscopy at the end of the in vivo study.
Results: There were no statistically significant changes in ERG among the groups. Abnormal FAF pattern and abnormal deposits in OCT were observed after injection but almost completely disappeared between week 2 and month 3 in all injected groups. GFAP staining showed that Müller glia cell activation was most pronounced in PLGA-injected eyes. Increased cell death was not observed by TUNEL staining at month 1. In electron microscopy at month 3, the remnants of microparticles were found in the retinal cells of all injected groups, and loss of plasma membrane was seen in the PLGA group.
Conclusions: Although morphological changes such as mild glial activation and material remnants were observed histologically 1 month and 3 months after injection in all injected groups, minor cell damage was noted only in the PLGA group at 3 months after injection. No evidence of functional abnormality relative to untreated eyes could be detected by ERG 3 months after injection in all groups. Changes observed in in vivo imaging such as OCT and FAF disappeared after 3 months in almost all cases.

Item Type:Article
Uncontrolled Keywords:Polyesteramide based on α-amino acids, Aliphatic dicarboxylic acids and aliphatic α-ω diols (PEA), Poly lactic-co-glycolic acid (PLGA), Invivo electroretinography, Invivo optical coherence tomography, Fundus auto-fluorescence, Immunohistochemistry, TUNEL stain, Transmission electron microscopy
Subjects:Medical sciences > Pharmacy
Medical sciences > Pharmacy > Pharmacology
Medical sciences > Pharmacy > Pharmaceutical technology
ID Code:51772
Deposited On:13 Mar 2019 12:44
Last Modified:01 Apr 2019 23:01

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