Liposomal Mupirocin Formulation for Systemic Delivery
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Solution Overview
Problem
Mupirocin, an antibiotic effective against gram-positive bacteria, is limited to topical application due to rapid degradation in the bloodstream and high binding to plasma proteins, necessitating a formulation for systemic delivery that maintains drug stability and controlled release.
Innovation Solution
Liposomal formulation of mupirocin with an intraliposomal compartment containing cyclodextrin and a pH-dependent ionizable anion, which stabilizes the drug and allows for slow release at the infection site, enhancing therapeutic efficacy and shelf-life stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mupirocin is administered systemically, then therapeutic effect can be achieved, but the drug rapidly degrades in the bloodstream
Solution Approach 1:
Mupirocin is nested within liposomes, which are spherical vesicles with an aqueous core surrounded by a phospholipid bilayer membrane. The drug is encapsulated in the intraliposomal compartment, protecting it from degradation in the bloodstream while enabling systemic delivery to infection sites
Solution Approach 2:
Cyclodextrin acts as an intermediary substance within the liposomal compartment that forms inclusion complexes with mupirocin. This intermediary interaction stabilizes the drug, prevents its degradation, and controls its release kinetics, thereby extending circulation time while maintaining therapeutic efficacy
2Quantity of substance
If high drug loading is achieved in liposomes, then therapeutic dose is provided, but drug release may be too rapid
Solution Approach 1:
The patent utilizes pH-dependent ionizable anions that change their ionization state in response to pH variations. In the acidic intraliposomal environment, the anions remain protonated and do not interact strongly with mupirocin, allowing high drug loading. Upon liposome administration, as pH increases in the extracellular environment, the anions become deprotonated and interact with mupirocin to slow its release, thereby controlling the release rate while maintaining high loading concentrations
3Manufacturing precision
If cyclodextrin is used to enhance drug solubility, then loading efficiency improves, but drug release stability may be compromised
Solution Approach 1:
The patent applies local quality by creating different chemical environments in different locations: the intraliposomal compartment contains cyclodextrin and pH-dependent ionizable anions that stabilize mupirocin and control its release, while the extraliposomal environment provides systemic circulation conditions. This spatial differentiation of properties allows both high loading efficiency and stable release characteristics to coexist
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The liposomal formulation achieves high drug loading, prolonged circulation time, slow drug release, and superior therapeutic efficacy, making it suitable for systemic clinical use while maintaining stability and effectiveness.
Implementation Method 1
the intraliposomal compartment encapsulating mupirocin, at least one cyclodextrin compound
Implementation Method 2
remote loading of mupirocin into the intra-liposome aqueous phase of liposomes encapsulating at least one CD and a pH dependent ionizable anion
Implementation Method 3
allowing for slow release at the infection site
Data Source
Figure 1~2
Figure 3A~3B
Figure 4~5
AI summary
The present disclosure provides liposomes encapsulating mupirocin, with particular benefit for systemic therapeutically effective delivery. Also provided herein are pharmaceutical compositions comprising the liposomes and methods of using them. The liposomes comprise a lipid membrane and an intraliposomal compartment, the intraliposomal compartment encapsulating mupirocin, at least one cyclodextrin compound and a pH dependent ionizable anion, e.g. acetate.