Macrophage Targeting pH Responsive Polymersomes for Glucocorticoid Therapy.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Pharmacology

Background:

• Glucocorticoids (GCs) are primary treatments for inflammatory diseases.
• Current GC therapies face limitations in precise delivery and side effects.
• Targeted drug delivery systems are needed to improve GC efficacy.

Purpose of the Study:

• To develop and evaluate pH responsive polymersomes for targeted GC delivery.
• To assess the stability, selectivity, and bioavailability of GCs within macrophages.
• To investigate the enhancement of anti-inflammatory effects using these nanocarriers.

Main Methods:

• Synthesis of poly(2-methacryloyloxyethyl phosphorylcholine)-poly(2-(diisopropylamino)ethyl methacrylate) (PMPC-PDPA) polymersomes.
• Loading of glucocorticoid drugs into the polymersomes.
• In vitro cellular studies using macrophages to assess drug delivery and efficacy.
• Molecular analysis of inflammation markers: nuclear factor-κB, tumour necrosis factor-α, interleukin-1β, and interleukin-6.

Main Results:

• PMPC-PDPA polymersomes demonstrated stability, selectivity, and enhanced bioavailability of loaded GCs in macrophages.
• Polymersomes significantly improved the anti-inflammatory activity of GCs.
• GC-loaded polymersomes effectively reduced key inflammation markers.

Conclusions:

• pH responsive PMPC-PDPA polymersomes are effective nanoscopic carriers for controlled GC delivery.
• This approach enhances anti-inflammatory effects and mitigates GC therapeutic limitations.
• PMPC-PDPA polymersomes show potential for improved inflammation management.