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Synthetic Spider Silk Production on a Laboratory Scale
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Bioengineering the spider silk sequence to modify its affinity for drugs.

Kamil Kucharczyk1,2, Marek Weiss3, Katarzyna Jastrzebska1,2

  • 1Department of Medical Biotechnology, Poznan University of Medical Sciences, Poznan, Poland, hanna.dams-kozlowska@wco.pl.

International Journal of Nanomedicine
|July 28, 2018
PubMed
Summary

Bioengineered spider silk spheres (EMS2) show improved drug loading efficiency for chemotherapy delivery. Modifying silk protein sequences allows control over drug affinity, enhancing its potential in biomedical applications.

Keywords:
bioengineeringcancer therapychemotherapeuticsdrug deliverysilkspheres

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Drug Delivery Systems

Background:

  • Silk is a biocompatible and biodegradable material with self-assembly properties, suitable for biomedical applications like drug carriers.
  • A novel bioengineered spider silk protein, EMS2, was developed to enhance chemotherapeutic delivery.

Purpose of the Study:

  • To evaluate the potential of the bioengineered EMS2 silk protein as a carrier for chemotherapeutics.
  • To compare the drug loading and release properties of EMS2-based spheres with a non-modified silk (MS2).

Main Methods:

  • Engineered EMS2 silk protein from a modified MS2 monomer (based on Nephila clavipes MaSp2 spidroin) using Escherichia coli expression.
  • Purification of silk proteins and formation of silk spheres.
  • Characterization of physical properties (morphology, zeta potential, secondary structure) and assessment of cytotoxicity (MTT assay).
  • Quantification of drug loading and release profiles (etoposide, mitoxantrone, doxorubicin) using spectrophotometry.

Main Results:

  • EMS2 silk self-assembled into non-cytotoxic spheres with distinct morphology and higher negative charge compared to MS2 spheres.
  • EMS2 spheres exhibited significantly higher drug loading efficiency for etoposide, mitoxantrone, and doxorubicin compared to MS2 spheres.
  • EMS2 demonstrated suitable release kinetics for neutral etoposide but faster release for positively charged doxorubicin and mitoxantrone, indicating sequence-dependent drug affinity.

Conclusions:

  • Bioengineered spider silk, specifically EMS2, offers enhanced drug loading capabilities for chemotherapy.
  • Modifying silk protein sequences provides a mechanism to control drug affinity and release kinetics.
  • EMS2 silk spheres show promise as tunable drug delivery vehicles for specific chemotherapeutics.