Polyelectrolyte multilayer-mediated gene delivery for semaphorin signaling pathway control

Area of Science:

• Biomaterials Science
• Cell Biology
• Molecular Biology

Background:

• Cell signaling pathways rely on specific receptor interactions.
• Semaphorin 3A (Sema3A) signaling involves co-receptors Neuropilin-1 (NRP-1) and Plexin-A1 (Plx-A1).
• Controlling the temporal and sequential expression of these co-receptors is key to understanding signal transduction.

Purpose of the Study:

• To demonstrate the capability of multilayered polyelectrolyte films (MPFs) to control the sequential gene expression of two cell receptors.
• To achieve fully functional signal transduction using MPFs for a model cell signaling process.
• To investigate the impact of MPF build-up on cell response to Sema3A stimulation.

Main Methods:

• Fabrication of MPFs using hyaluronan, chitosan, poly-allylamine hydrochloride, and poly-sodium-4-styrenesulfonate.
• Sequential functionalization of MPFs with plasmids encoding NRP-1 and Plx-A1.
• Delivery of functionalized MPFs to Cos-1 cells.
• Stimulation of Cos-1 cells with Sema3A to observe cell collapse phenotype.

Main Results:

• MPFs successfully delivered plasmids for NRP-1 and Plx-A1 expression in Cos-1 cells.
• The timing and order of plasmid expression were controlled by the MPF build-up scheme.
• Co-expression of NRP-1 and Plx-A1 in response to Sema3A stimulation induced a cell collapse phenotype.
• Transgene products remained functional for several days, mediating Sema3A co-receptor activity.

Conclusions:

• MPFs offer a versatile platform for controlling sequential gene expression in cell signaling.
• This approach enables the study of complex signaling pathways by precisely modulating receptor availability.
• The developed MPF system demonstrates potential for applications in regenerative medicine and targeted therapies.