Synthetic aptamer-polymer hybrid constructs for programmed drug delivery into specific target cells

Area of Science:

• Biomolecular Engineering
• Nanotechnology
• Drug Delivery Systems

Background:

• Viruses utilize specialized mechanisms for efficient intracellular delivery of biomolecules.
• Current synthetic delivery methods lack the efficiency and specificity of viral systems.
• Targeted delivery of therapeutics remains a significant challenge in medicine.

Purpose of the Study:

• To develop a synthetic system for targeted therapeutic delivery inspired by viral mechanisms.
• To synthesize chemically defined aptamer-polymer hybrids (APHs) for controlled payload release.
• To demonstrate the efficacy of APHs in targeting and killing cancer cells.

Main Methods:

• Synthesis of aptamer-polymer hybrids (APHs) using click chemistry.
• Coupling cell-targeting aptamers to block copolymers for payload encapsulation.
• Utilizing endocytosis for cellular entry upon target recognition.
• Visualizing the delivery process using coumarin dye.
• Assessing targeted tumor cell killing with doxorubicin.

Main Results:

• Successfully synthesized APHs capable of recognizing specific cell-surface markers.
• Demonstrated efficient cellular uptake via endocytosis.
• Confirmed payload release into the cytoplasm after cellular entry.
• Visualized the intracellular delivery process using coumarin dye.
• Showcased targeted killing of tumor cells using doxorubicin-loaded APHs.

Conclusions:

• The developed APH system mimics viral efficiency for targeted intracellular delivery.
• This platform offers a versatile approach for delivering various therapeutic payloads.
• The APH technology shows promise for developing novel cancer therapies with improved specificity.