Nucleoside Diphosphate Prodrugs: Nonsymmetric DiPPro-Nucleotides

Area of Science:

• Medicinal Chemistry
• Biochemistry
• Virology

Background:

• Nucleoside diphosphates (NDPs) are crucial for cellular processes but face delivery challenges.
• Developing effective delivery systems for NDPs is essential for therapeutic applications, particularly antiviral treatments.

Purpose of the Study:

• To design and evaluate nonsymmetric DiPPro-nucleotides as novel nucleoside diphosphate (NDP) delivery systems.
• To investigate the controlled release of NDPs from prodrugs with varying bioreversible moieties.
• To assess the efficacy of DiPPro-nucleotides against HIV, including in thymidine kinase-deficient cells.

Main Methods:

• Synthesis of DiPPro-nucleotides with distinct bis(acyloxybenzyl) moieties at the β-phosphate.
• Hydrolysis studies (chemical and enzymatic) of alkanoylbenzyl and benzoylbenzyl prodrug groups.
• Lipophilicity assessment of prodrug moieties for cell membrane penetration.
• Selective NDP delivery analysis in CEM cell extracts.
• Antiviral activity testing against HIV, including in thymidine kinase-deficient CEM cells.

Main Results:

• Compounds with short-chain alkanoyl esters demonstrated rapid hydrolysis.
• Lipophilic aliphatic or aromatic residues in the second prodrug group facilitated cell membrane penetration.
• Stepwise removal of prodrug moieties enabled controlled and selective NDP delivery.
• DiPPro-nucleotides exhibited high activity against HIV, even in thymidine kinase-deficient CEM cells.
• Cellular uptake and NDP release were confirmed despite the α-phosphate charge.

Conclusions:

• Nonsymmetric DiPPro-nucleotides represent a promising strategy for targeted nucleoside diphosphate delivery.
• The tailored design of bioreversible moieties allows for controlled drug release and enhanced cellular uptake.
• These compounds offer a potential new therapeutic avenue for HIV treatment, overcoming resistance mechanisms.