The influence of blood on targeted microbubbles

Area of Science:

• Biomedical Engineering
• Drug Delivery Systems
• Nanotechnology

Background:

• Targeted drug delivery aims to improve therapeutic efficacy and reduce side effects.
• Clinical translation of targeted delivery systems is hindered by a poor correlation between in vitro and in vivo results.
• In vitro assays often fail to replicate the complex environment of the human body, particularly blood.

Purpose of the Study:

• To investigate the impact of whole blood characteristics on the efficiency of targeted drug delivery.
• To identify a potential reason for the discrepancy between in vitro and in vivo outcomes in targeted delivery research.
• To provide insights for improving the design of targeted drug delivery systems and their evaluation methods.

Main Methods:

• Two distinct model systems were utilized for evaluating targeted delivery.
• Biochemical and magnetic targeting strategies were employed in the model systems.
• Targeting efficiency was compared under conditions using whole blood versus saline under identical flow parameters.

Main Results:

• Whole blood significantly reduces the targeting efficiency of therapeutic molecules compared to saline.
• This reduction in efficiency was observed across both biochemical and magnetic targeting model systems.
• The presence of blood components demonstrably impacts the performance of targeted delivery strategies.

Conclusions:

• The characteristics of whole blood are a critical factor influencing targeted drug delivery efficiency.
• Current in vitro assays may not adequately predict in vivo performance due to the exclusion of blood's effects.
• Future development of targeted delivery systems and associated assays must account for blood's impact for successful clinical translation.