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In-vivo Detection of Protein-protein Interactions on Micro-patterned Surfaces

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Published on: March 19, 2010

A Label-Free Multitechnique Approach to Characterize the Interaction of Bioactive Compounds with Biomimetic

Eduarda Fernandes¹, Rui R Costa², Raúl Machado³

¹CF-UM-UP Centro de Física das Universidades do Minho e Porto Universidade do Minho 4710-057 Braga Portugal.

|April 11, 2025

Summary

This study introduces a novel multitechnique approach to investigate drug-membrane interactions using five label-free methods. The research explores how compounds like caffeine affect biomimetic lipid membranes, providing insights into membrane biophysics.

Keywords:

biomimetic models label‐free interaction characterizations quartz‐crystal microbalances small and wide‐angle X‐Ray scattering supported lipid bilayers surface plasmon resonances

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Published on: December 1, 2020

Area of Science:

Membrane biophysics
Biomimetic interfaces
Drug-membrane interactions

Background:

Cell membranes are complex microenvironments crucial for biological activities.
Understanding bioactive compound interactions with membranes is vital.
Biomimetic interfaces offer insights into membrane biophysics.

Purpose of the Study:

To develop and validate a synergistic multitechnique approach for studying drug-membrane interactions.
To investigate the biophysical effects of bioactive compounds on biomimetic lipid membranes.
To combine real-time and steady-state analyses for a comprehensive understanding.

Main Methods:

Derivative spectroscopy
Synchrotron small- and wide-angle X-ray scattering (SAXS/WAXS)
Attenuated total reflection-Fourier-transform infrared spectroscopy (ATR-FTIR)
Quartz-crystal microbalance with dissipation (QCM-D)
Surface plasmon resonance (SPR)

Main Results:

Demonstrated the complementary capabilities of five label-free techniques.
Investigated interactions of caffeine, testosterone, and diclofenac with lipid bilayers.
Analyzed adsorption, distribution, location, and biophysical changes (order, fluidity, thickness, hydration, area per lipid).

Conclusions:

The multitechnique approach provides a comprehensive understanding of drug-membrane interactions.
Biomimetic membranes with and without cholesterol exhibit distinct responses to bioactive compounds.
This method elucidates the biophysical modulation of membranes by bioactive molecules.