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Efficient Drug Release from Liposomes Introduced Tetrazine Derivatives with Pyrimidine Rings Using Click Chemistry
Mizuho Yamasaki1, Masayuki Munekane1,2, Kento Kannaka1
1Laboratory of Biophysical Chemistry, Kobe Pharmaceutical University, 4-19-1 Motoyamakita-machi, Higashinada-ku, Kobe 658-8558, Japan.
Chemical & Pharmaceutical Bulletin
|February 24, 2025
Summary
Researchers developed a new drug delivery system using bioorthogonal click chemistry. Tetrazine derivatives with pyrimidine rings on liposomes enhance drug release rates, advancing controlled delivery methods.
Area of Science:
- Biochemistry
- Materials Science
- Drug Delivery
Background:
- Bioorthogonal reactions, particularly the inverse electron demand Diels-Alder (IEDDA) reaction, offer precise control over chemical processes in biological systems.
- Tetrazine ligation is a prominent click chemistry reaction, but reaction rates can be modulated by structural modifications.
- Previous studies suggest that incorporating pyrimidine rings into tetrazine derivatives can accelerate their reaction kinetics with dienophiles.
Purpose of the Study:
- To investigate the efficacy of tetrazine derivatives containing pyrimidine rings for controlled drug release from liposomes via click chemistry.
- To synthesize and characterize a novel pyrimidine-containing tetrazine derivative (Tz2) and compare its reaction kinetics with a pyridine-containing analogue (Tz1).
- To evaluate the drug release profile of liposomes functionalized with Tz2.
Main Methods:
- Synthesis and kinetic evaluation of a pyrimidine-based tetrazine derivative (Tz2) and comparison with a pyridine-based analogue (Tz1).
- Preparation of Tz2-functionalized liposomes (Tz2-liposomes) encapsulating a model drug ([111In]In-DTPA).
- Confirmation of the click reaction on liposomal membranes using high-resolution mass spectrometry and assessment of drug release triggered by a norbornene derivative (NBCOOH).
Main Results:
- The synthesized Tz2 exhibited a higher reaction rate constant with 5-norbornenecarboxylic acid (NBCOOH) compared to Tz1.
- The click reaction between Tz2 and NBCOOH on liposomal membranes was successfully confirmed.
- Tz2-liposomes demonstrated significant and concentration-dependent release of [111In]In-DTPA upon addition of NBCOOH, outperforming Tz1-liposomes.
Conclusions:
- Pyrimidine-containing tetrazine derivatives significantly enhance drug release rates from liposomes through bioorthogonal click chemistry.
- The improved kinetics are attributed to the electronic properties of the pyrimidine ring, accelerating the IEDDA reaction.
- This study provides a foundation for developing advanced controlled drug release systems utilizing optimized click chemistry strategies.
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