Pentablock copolymer dexamethasone nanoformulations elevate MYOC: in vitro liberation, activity and safety in human trabecular meshwork cells.

Journal Article (Journal Article)

AIM: The aim of this study is to examine the elevation of MYOC in long-term treatment of human trabecular meshwork (HTM) cells using dexamethasone (DEX) encapsulated pentablock (PB) copolymer-based nanoparticles (NPs) (DEX-PB-NPs). MATERIALS & METHODS: PB copolymers and DEX-PB-NPs were synthesized and characterized using nuclear magnetic resonance, gel permeation chromatography, and X-ray diffraction analyses. MYOC levels secreted from HTM cells were measured by western blot (WB) analysis. RESULTS: DEX-PB-NPs were formulated in the size range of 109 ± 3.77 nm (n = 3). A long term DEX release from the NPs was observed over three months. Cell viability and cytotoxicity were not affected up to 12 weeks of treatment with PB-copolymer or DEX-PB-NPs. WB data from five HTM cell strains showed that MYOC levels increased by 5.2 ± 1.3, 7.4 ± 4.3, and 2.8 ± 1.1-fold in the presence of DEX-PB-NPs compared with 9.2 ± 3.8, 2.2 ± 0.5, and 1.5 ± 0.3-fold at 4, 8 and 12 weeks in control-DEX treatment group, respectively (n = 5). Based on the decline in MYOC levels after withdrawal of DEX from control wells, DEX-PB-NPs released the DEX for at least 10 weeks. CONCLUSION: The treatment of HTM cells using DEX-PB-NPs were analyzed in this study. The in vitro cell-based system developed here is a valuable tool for determining the safety and effects of steroids released from polymeric NPs.

Full Text

Duke Authors

Cited Authors

  • Agrahari, V; Li, G; Agrahari, V; Navarro, I; Perkumas, K; Mandal, A; Stamer, WD; Mitra, AK

Published Date

  • August 2017

Published In

Volume / Issue

  • 12 / 16

Start / End Page

  • 1911 - 1926

PubMed ID

  • 28756742

Pubmed Central ID

  • PMC5551562

Electronic International Standard Serial Number (EISSN)

  • 1748-6963

Digital Object Identifier (DOI)

  • 10.2217/nnm-2017-0140


  • eng

Conference Location

  • England