Engineered Site-specific Vesicular Systems for Colonic Delivery: Trends and Implications

Area of Science:

• Pharmaceutical Sciences
• Drug Delivery Systems
• Nanotechnology

Background:

• Oral drug delivery to the colon faces challenges including drug degradation in the upper gastrointestinal tract and enzymatic instability.
• Colon-specific coated liposomal systems (CSLS) present a promising strategy for targeted colonic delivery, enhancing drug stability and bioavailability.
• Existing liposomal formulations for oral delivery encounter barriers like gastrointestinal instability and membrane permeability issues.

Purpose of the Study:

• To review the engineering processes involved in developing industrially viable CSLS for targeted colonic drug delivery.
• To explore advancements in CSLS that improve stability and permeability for oral administration.
• To address the challenges hindering the clinical translation of oral CSLS.

Main Methods:

• Review of current literature on CSLS formulations and their modifications.
• Analysis of strategies for enhancing liposome stability and permeability for oral delivery.
• Evaluation of factors influencing the industrial viability and scale-up of CSLS.

Main Results:

• Modifications to lipid bilayer composition, polymers, and ligands have improved CSLS stability and permeability for oral delivery.
• Despite technological advancements, no oral CSLS has achieved commercialization for targeted colon delivery.
• CSLS demonstrate significant potential for industrial manufacturing due to their simple, low-cost design.

Conclusions:

• CSLS hold considerable promise for targeted colonic drug delivery, offering protection from degradation and prolonged residence time.
• Further research and development are needed to overcome barriers to clinical translation and commercialization of oral CSLS.
• The industrial viability and cost-effectiveness of CSLS make them an attractive area for pharmaceutical manufacturers.