Protein-protein interactions between SWCNT/chitosan/EGF and EGF receptor: a model of drug delivery system

Area of Science:

• Biomedical Engineering
• Materials Science
• Computational Chemistry

Background:

• Epidermal growth factor receptor (EGFR) is overexpressed on many cancer cells, making it a target for cancer therapy.
• Drug delivery systems (DDS) conjugated with targeting ligands can improve therapeutic specificity and efficacy.
• Single-wall carbon nanotubes (SWCNTs) offer potential as drug carriers due to their unique properties.

Purpose of the Study:

• To investigate the binding affinity and intermolecular interactions of an EGF-conjugated DDS with EGFR.
• To evaluate the potential of an EGF-chitosan-SWCNT-Drug complex as a targeted cancer therapy.
• To compare the binding characteristics of the modified DDS with native EGF-EGFR interactions.

Main Methods:

• 50 ns molecular dynamics simulations were conducted on EGFR complexed with EGF, and EGF linked to SWCNT via chitosan.
• The binding patterns and affinities of the EGF-CS-SWCNT-Drug complex to EGFR were analyzed.
• The role of the chitosan linker in preventing undesired SWCNT interactions was assessed.

Main Results:

• The EGF-CS-SWCNT-Drug complex exhibited a binding pattern comparable to EGF alone.
• The binding affinity of the EGF-CS-SWCNT-Drug complex to EGFR was predicted to be superior to EGF alone.
• Chitosan effectively prevented undesirable interactions of SWCNT within the EGFR binding pocket.

Conclusions:

• EGF conjugated to SWCNT via a chitosan linker forms a promising smart DDS for cancer therapy.
• This formulation enhances targeting specificity through EGF-EGFR interaction.
• The study supports the development of SWCNT-based DDS as an alternative cancer treatment strategy.