Erythrocyte engineering for drug delivery and targeting

Area of Science:

• Biotechnology
• Drug Delivery Systems
• Hematology

Background:

• Encapsulating non-diffusible drugs into human erythrocytes (red blood cells) presents significant challenges.
• Existing methods may require complex procedures or suboptimal conditions for drug loading.

Purpose of the Study:

• To develop a novel, efficient procedure for encapsulating non-diffusible drugs into human erythrocytes.
• To establish a method that operates under blood-banking conditions for potential clinical applications.

Main Methods:

• A new apparatus, the 'Red Cell Loader', was utilized for the procedure.
• The process involves two sequential hypotonic dilutions of washed red cells, followed by concentration using a haemofilter and resealing.
• The procedure was performed at room temperature using as little as 50 ml of blood.

Main Results:

• Successful encapsulation of various biologically active compounds into erythrocytes was achieved within 2 hours.
• The procedure yielded 35-50% cell recovery and approximately 30% encapsulation of added drugs.
• Processed erythrocytes demonstrated normal in vivo survival and could be further modified for targeted drug delivery.

Conclusions:

• A new, efficient method for erythrocyte encapsulation of non-diffusible drugs has been established.
• The 'Red Cell Loader' procedure is suitable for blood-banking conditions and allows for potential drug targeting applications.
• This technique offers a promising approach for developing novel drug delivery systems using erythrocytes.