Semiconducting Polymer Nanoporous Thin Films as a Tool to Regulate Intracellular ROS Balance in Endothelial Cells

Area of Science:

• Biomaterials Science
• Nanotechnology
• Redox Biology

Background:

• Developing photoelectrodes for redox medicine requires precise control over intracellular reactive oxygen species (ROS).
• Existing methods often lack the specificity and non-invasive nature needed for therapeutic applications.

Purpose of the Study:

• To design and synthesize nanometer-scale porous photoelectrodes for enhanced ROS generation.
• To investigate the photoelectrochemical properties of these materials in cellular environments.
• To demonstrate the modulation of intracellular ROS in human umbilical vein endothelial cells (HUVECs).

Main Methods:

• Synthesis of poly(3-hexylthiophene) (P3HT) and poly(lactic acid) (PLA) graft copolymers (P3HT-g-PLA).
• Fabrication of nanometer-scale porous P3HT thin films via PLA hydrolysis.
• Characterization of film morphology using atomic force microscopy (AFM) and transmission electron microscopy (TEM).
• Assessment of ROS generation using scanning electrochemical microscopy (SECM).

Main Results:

• Porous P3HT thin films exhibited enhanced photoelectrochemical ROS generation compared to non-porous films.
• Controlled pore sizes (220-1200 nm) were achieved by adjusting copolymer composition and structure.
• Exogenous ROS modulated intracellular ROS in HUVECs at non-toxic levels, impacting cellular functions.

Conclusions:

• Nanometer-scale porous P3HT films are effective photoelectrodes for enhanced ROS generation.
• This technology enables precise, on-demand, non-invasive modulation of intracellular ROS.
• Potential applications in redox medicine and various cell models exist.