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Related Experiment Videos

Glucuronate-modified liposomes with prolonged circulation time.

Y Namba1, T Sakakibara, M Masada

  • 1Research Laboratories, Nippon Fine Chemical Co., Ltd., Hyogo, Japan.

Chemical & Pharmaceutical Bulletin
|June 1, 1990
PubMed
Summary
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Researchers synthesized 1-O-palmityl-D-glucuronic acid (PGlcUA) liposomes, demonstrating a 1.7-fold longer blood circulation time compared to DPPG-liposomes. This suggests PGlcUA enhances liposome longevity in vivo.

Area of Science:

  • Biochemistry
  • Materials Science
  • Pharmacology

Background:

  • Liposomes are crucial drug delivery systems.
  • Enhancing liposome circulation time is vital for therapeutic efficacy.
  • Surface modification of liposomes can alter their pharmacokinetic profiles.

Purpose of the Study:

  • To synthesize 1-O-palmityl-D-glucuronic acid (PGlcUA) for liposome formulation.
  • To evaluate the impact of PGlcUA incorporation on liposome blood circulation time and tissue distribution.
  • To compare PGlcUA-liposomes with conventional dipalmitoylphosphatidylglycerol (DPPG)-liposomes.

Main Methods:

  • Synthesis of PGlcUA and its incorporation into liposomes (DPPC/cholesterol/PGlcUA, 40:40:20 molar ratio).
  • Preparation of control DPPG-liposomes (DPPC/cholesterol/DPPG, 40:40:20 molar ratio).

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  • Intravenous injection of [3H]inulin-loaded liposomes into rats and subsequent pharmacokinetic analysis (blood half-life, plasma/tissue distribution, urinary excretion).

    • Main Results:

    • PGlcUA-liposomes exhibited a 1.7-fold longer blood half-life compared to DPPG-liposomes.
    • Plasma radioactivity was 2.5-fold higher in rats treated with PGlcUA-liposomes at 22 hours post-injection.
    • Urinary excretion of radioactivity was 25% lower for PGlcUA-liposomes, indicating reduced clearance.
    • Similar size distribution and zeta-potential were observed between PGlcUA- and DPPG-liposomes.

    Conclusions:

    • PGlcUA incorporation significantly prolongs liposome circulation time in vivo.
    • The glucuronic acid moiety, not just negative charge, appears responsible for enhanced liposome stability.
    • PGlcUA represents a promising component for developing long-circulating liposomal drug delivery systems.