A Flexible PDMS-Based Optical Biosensor for Stretch Monitoring in Cardiac Tissue Samples.

Area of Science:

• Biomedical Engineering
• Cardiovascular Research
• Materials Science

Background:

• Drug-induced cardiotoxicity poses significant risks, necessitating early detection during pharmaceutical development.
• Current in vitro models often fail to replicate the mechanical stresses (static and cyclic stretches) experienced by cardiac muscle cells in vivo.
• Accurate assessment of mechanical loads on cardiac tissues is vital for reliable cardiotoxicity screening.

Purpose of the Study:

• To design and fabricate a novel biosensor for monitoring stretch in cardiac biopsies and tissue cultures.
• To develop a cost-effective and reliable method for assessing mechanical stimuli in in vitro cardiac models.
• To enhance the accuracy of early-stage cardiotoxicity detection by mimicking in vivo mechanical conditions.

Main Methods:

• Fabrication of a biosensor utilizing a biocompatible, thin, flexible membrane as an optical waveguide.
• Integration of the sensing membrane for sample attachment, enabling detection of pressure-induced shape changes and stretches.
• Experimental validation of the biosensor's measurement technique through various prototype tests and simulations.

Main Results:

• Successful fabrication of cost-effective biosensor prototypes.
• Experimental validation demonstrating the measurement of stretches up to 1.5%.
• Simulations indicating the potential for the technique to measure stretches ranging from 10% to 30%.

Conclusions:

• The developed biosensor offers a promising tool for monitoring mechanical stretch in cardiac tissue models.
• This technology can significantly improve the reliability of in vitro cardiotoxicity testing by simulating in vivo conditions.
• The biosensor's capability to measure physiological stretch levels paves the way for more accurate pharmaceutical safety assessments.