A convenient solid-phase method for the synthesis of novel oligonucleotide-folate conjugates

Area of Science:

• Bioconjugation Chemistry
• Oligonucleotide Synthesis
• Drug Delivery Systems

Background:

• Folic acid is crucial for cell targeting due to folate receptor expression on various cancer cells.
• Oligonucleotide-based therapeutics require efficient delivery systems for improved efficacy.
• Developing regioselective conjugation methods is essential for creating functional oligonucleotide-folate conjugates.

Purpose of the Study:

• To prepare and characterize novel polymer supports for folic acid incorporation into oligonucleotides.
• To establish a regioselective method for attaching nucleic acid sequences to L-glutamic acid via its alpha- or gamma-carboxyl group.
• To evaluate the utility of these supports in synthesizing oligonucleotide-folate conjugates for cell delivery studies.

Main Methods:

• Preparation of two distinct polymer support batches.
• Regioselective solid-phase synthesis utilizing the 3'-end of oligonucleotides.
• Attachment to either the alpha- or gamma-carboxyl group of L-glutamic acid.
• Synthesis of oligonucleotide-folate conjugates.

Main Results:

• Successful preparation of two polymer support batches.
• Demonstration of regioselective attachment of oligonucleotides to specific carboxyl groups of L-glutamic acid.
• Synthesis of functional oligonucleotide-folate conjugates confirmed.

Conclusions:

• The developed polymer supports facilitate the regioselective incorporation of folic acid into oligonucleotides.
• This method provides a robust platform for creating oligonucleotide-folate conjugates for cell delivery applications.
• The synthesized conjugates show potential for targeted delivery studies.