A poly-ADP-ribose polymer-based antibody-drug conjugate

Area of Science:

• Biochemistry
• Molecular Biology
• Drug Delivery

Background:

• Protein poly-ADP-ribosylation (PARylation) is a crucial posttranslational modification involved in various physiological and pathophysiological processes.
• Poly-ADP-ribose polymerases (PARPs) catalyze PARylation by transferring ADP-ribose units from NAD+ to proteins, forming poly-ADP-ribose (PAR) polymers.

Purpose of the Study:

• To explore the novel concept of using functionalized PAR polymers for targeted drug delivery.
• To design and synthesize a PAR polymer-based antibody-drug conjugate for specific cancer cell targeting.

Main Methods:

• Rapid generation of auto-PARylated PARP1 using 3'-azido ADP-riboses.
• Conjugation of anti-HER2 antibodies and monomethyl auristatin F (MMAF) payloads to the PARylated PARP1.
• Evaluation of the conjugate's efficacy in killing HER2-expressing cancer cells.

Main Results:

• Successfully generated functionalized PAR polymers via auto-PARylation of PARP1.
• Created a PARylated PARP1-antibody-MMAF conjugate with high specificity for HER2-expressing cancer cells.
• Demonstrated potent killing of target cancer cells by the designed conjugate.

Conclusions:

• Proof-of-principle for producing PAR polymer-based antibody-drug conjugates.
• Validated the application of PAR polymer conjugates in targeted drug delivery.
• Suggests potential for new therapeutics with enhanced properties.