A lysinated thiophene-based semiconductor as a multifunctional neural bioorganic interface.

Area of Science:

• Materials Science
• Neuroscience
• Biotechnology

Background:

• Organic semiconductors offer unique electronic and optical properties.
• Developing biocompatible materials for neural interfacing is crucial for neurotechnology.
• Existing substrates often have limitations in supporting neural cell adhesion and growth.

Purpose of the Study:

• To introduce lysinated molecular organic semiconductors as multifunctional platforms for neural cells.
• To characterize the properties and biocompatibility of quaterthiophene modified with lysine (T4Lys).
• To evaluate the performance of T4Lys as a substrate for neural cell culture and interfacing.

Main Methods:

• Fabrication of cast films of quaterthiophene semiconductor covalently modified with lysine-end moieties (T4Lys).
• Characterization of T4Lys film properties: stability, morphology, optical, electrical, and biocompatibility.
• Culturing primary rat dorsal root ganglion (DRG) neurons on T4Lys, T4, and poly-l-lysine coated glass.
• Neurite length and neuron adhesion quantification.
• Whole-cell patch-clamp recordings to assess neuronal biofunctionality.

Main Results:

• T4Lys films exhibit fluorescence, electronic transport, and humidity-activated ionic conduction.
• Lysine insertion enabled adhesion of primary rat DRG neurons, unlike unmodified T4.
• T4Lys supported higher neuron adhesion and twofold longer neurite length than poly-l-lysine.
• Neuronal biofunctionality was preserved on T4Lys substrates.

Conclusions:

• Lysinated organic semiconductors represent an innovative platform for neural interfaces.
• These materials combine optical and iono-electronic functionalities with enhanced biocompatibility and neuron affinity.
• T4Lys offers a promising approach for simplified bioorganic devices for neural communication and optoelectronic control.