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Oxytocin-Selective Nanogel Antibody Mimics.

Rashmi Mahajan¹, Subramanian Suriyanarayanan¹, Gustaf D Olsson¹

¹Bioorganic and Biophysical Chemistry Laboratory, Linnaeus University Centre for Biomaterials Chemistry, Department of Chemistry and Biomedical Sciences, Linnaeus University, 39182 Kalmar, Sweden.

International Journal of Molecular Sciences

|March 10, 2022

Summary

Novel oxytocin imprinted polymer nanoparticles demonstrate sub-nanomolar affinity for oxytocin recognition. These synthetic materials show binding capabilities comparable to polyclonal antibodies, offering potential diagnostic applications.

Keywords:

NMR QCM molecular dynamics molecularly imprinted polymer nanoparticle oxytocin peptide imprinting plastic antibody solid-phase synthesis

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Area of Science:

Materials Science
Nanotechnology
Biochemistry

Background:

Molecular imprinting is a powerful technique for creating synthetic receptors.
Oxytocin plays crucial roles in social bonding and reproduction.
Developing selective and high-affinity oxytocin sensors is of significant interest.

Purpose of the Study:

To synthesize and characterize oxytocin imprinted polymer nanoparticles.
To investigate the binding affinity and selectivity of these nanoparticles for oxytocin.
To compare the performance of imprinted nanoparticles with biological recognition elements.

Main Methods:

Glass bead supported solid-phase synthesis for nanoparticle creation.
Nuclear Magnetic Resonance (NMR) and molecular dynamics for interaction studies.
Dynamic light scattering, electron microscopy, and X-ray photoelectron spectroscopy for characterization.
Quartz crystal microbalance (QCM) for binding affinity measurements.

Main Results:

Successful synthesis of oxytocin imprinted polymer nanoparticles.
Characterization confirmed nanoparticle morphology and composition.
QCM studies revealed a sub-nanomolar binding affinity for oxytocin (k ≈ 0.3 ± 0.02 nM).
Affinity was found to be comparable to commercial polyclonal antibodies (k ≈ 0.02-0.2 nM).

Conclusions:

Oxytocin imprinted polymer nanoparticles exhibit high-affinity molecular recognition capabilities.
These synthetic nanoparticles present a viable alternative to antibodies for oxytocin detection.
The developed nanoparticles hold promise for applications in diagnostics and biosensing.