Polyelectrolyte multilayer films as substrates for photoreceptor cells.

Area of Science:

• Biomaterials Science
• Ophthalmology
• Cell Biology

Background:

• Restoring vision in retinal degeneration requires effective delivery of functional photoreceptors.
• Extracellular matrix substrates are essential for supporting photoreceptor cells in conditions like age-related macular degeneration.

Purpose of the Study:

• To assemble and characterize polyelectrolyte multilayer films for photoreceptor cell delivery.
• To evaluate the influence of film composition and functionalization on photoreceptor cell attachment and viability.

Main Methods:

• Layer-by-layer deposition was used to create polyelectrolyte films (PLL/CSA, PLL/PSS, PLL/HA).
• Film buildup was monitored using quartz crystal microbalance, optical waveguide light mode spectroscopy, confocal microscopy, and atomic force microscopy.
• Photoreceptor cell viability and attachment were assessed on different film configurations and functionalized films.

Main Results:

• Photoreceptor cell viability was optimal on a single layer of poly(L-lysine) (PLL(1)) and improved with 10 bilayers of PLL/hyaluronic acid (PLL/HA) or PLL/chondroitin sulfate (PLL/CSA).
• The number of bilayers and the terminating layer significantly impacted photoreceptor cell attachment.
• Adsorption of basic fibroblastic growth factor (bFGF) or interphotoreceptor matrix (IPM) on (PLL/CSA)(10)/PLL films enhanced photoreceptor cell attachment and differentiation.

Conclusions:

• Polyelectrolyte multilayer films can be successfully assembled for photoreceptor cell delivery.
• Film architecture and functionalization with bFGF or IPM significantly enhance photoreceptor cell integration and survival.
• These engineered substrates hold potential for regenerative therapies in retinal diseases.