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Toxicity and Intraocular Properties of a Novel Long-Acting Anti-Proliferative and Anti-Angiogenic Compound IMS2186

Purpose: To investigate the intraocular properties and toxicity of IMS2186, a small molecule developed as an anti-choroidal neovascularization (anti-CNV) drug. Materials and Methods: Cellular toxicity and mechanism of action was tested on cell lines in vitro. Intraocular studies used rabbits for drug dissolution as well as toxicity and rats for the treatment study as well as the toxicity confirmation study. Rabbits' eyes were injected with 2.5 mg of IMS2186 and observed for 36 weeks. Laser-induced CNV in rats was treated with IMS2186, Kenalog, or phosphate-buffered saline (pBS). Fluorescein angiography (FA) and immunohistochemical processing of the globes was performed. Results: The anti-proliferative IC50 of IMS2186 for human fibroblast cells was 1.0–3.0 μ M and 0.3–3.0 μ M for human cancer cells; the IC50 of IMS2186 to inhibit endothelial tube formation was 0.1–0.3 μ M. The IC50 of IMS2186 for inhibiting the production of pro-inflammatory cytokines was 0.3–1 μ M. The IC50 of IMS2186 for inhibiting macrophage migration was 1 μ M. These biological properties were not species specific. IMS2186 can be formulated as a suspension for long-lasting release and when delivered intraocularly, no intraocular toxicity was observed by slit lamp exam, fundus exam, intraocular pressure measurements, or by electroretinography. FA showed a reduction in the leakage in eyes treated with IMS2186 and triamcinolone acetonide; DAPI staining also showed significantly less cellularity in IMS2186-treated lesions as compared to PBS (p = 0.0025). Conclusion: IMS2186 may be a safe intraocular therapeutic agent for intraocular proliferation and angiogenesis.