Transscleral sustained ranibizumab delivery using an episcleral implantable device: Suppression of laser-induced choroidal neovascularization in rats

Nobuhiro Nagai, Zhaleh Kashkouli Nezhad, Reiko Daigaku, Saaya Saijo, Yuanhui Song, Keiko Terata, Ayako Hoshi, Matsuhiko Nishizawa, Toru Nakazawa, Hirokazu Kaji, Toshiaki Abe

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Successful treatment of age-related macular diseases requires an effective controlled drug release system with less invasive route of administration in the eye to reduce the burden of frequent intravitreal injections for patients. In this study, we developed an episcleral implantable device for sustained release of ranibizumab, and evaluated its efficacy on suppression of laser-induced choroidal neovascularization (CNV) in rats. We tested both biodegradable and non-biodegradable sheet-type devices consisting of crosslinked gelatin/chitosan (Gel/CS) and photopolymerized poly(ethyleneglycol) dimethacrylate that incorporated collagen microparticles (PEGDM/COL). In vitro release studies of FITC-labeled albumin showed a constant release from PEGDM/COL sheets compared to Gel/CS sheets. The Gel/CS sheets gradually biodegraded in the sclera during the 24-week implantation; however, the PEGDM/COL sheets did not degrade. FITC-albumin was detected in the retina during 18 weeks implantation in the PEGDM/COL sheet-treated group, and was detected in the Gel/CS sheet-treated group during 6 weeks implantation. CNV was suppressed 18 weeks after application of ranibizumab-loaded PEGDM/COL sheets compared to a placebo PEGDM/COL sheet-treated group, and to the intravitreal ranibizumab-injected group. In conclusion, the PEGDM/COL sheet device suppressed CNV via a transscleral administration route for 18 weeks, indicating that prolonged sustained ranibizumab release could reduce the burden of repeated intravitreal injections.

Original languageEnglish
Article number118458
JournalInternational Journal of Pharmaceutics
Volume567
DOIs
Publication statusPublished - 2019 Aug 15

Keywords

  • Age-related macular disease
  • Choroidal neovascularization
  • Drug delivery system
  • Polyethylene glycol dimethacrylate
  • Retina
  • Transscleral delivery

ASJC Scopus subject areas

  • Pharmaceutical Science

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