Abstract
Herein we describe a three-dimensional co-culture bioassay protocol designed to assess the therapeutic potential of the proteins expressed from gene delivery transfected cells through the evaluation of expressed protein bioavailability and bioactivity. Using a combination of enzyme-linked immunosorbent assay (ELISA) and immunofluorescent-based neurite length profiling methodologies, the bioavailability of the secreted therapeutic protein in the medium can be quantitated, and the bioactivity of the secreted therapeutic protein can also be evaluated through neurite length profiling, respectively. The versatility and rationale of this bioassay could serve as a useful screening tool in the development of retinal gene delivery systems.
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