Aptamer-crosslinked microbubbles: smart contrast agents for thrombin-activated ultrasound imaging

Area of Science:

• Biomedical Engineering
• Diagnostic Imaging
• Biochemistry

Background:

• Thrombosis is a critical factor in cardiovascular diseases and cancers.
• Early detection of thrombosis is essential for effective treatment.
• Current diagnostic methods for thrombosis have limitations.

Purpose of the Study:

• To develop a novel microbubble contrast agent for thrombosis detection.
• To enable ultrasound-based detection of elevated thrombin levels.
• To provide a sensitive and rapid diagnostic tool for blood clotting.

Main Methods:

• Development of a microbubble contrast agent activated by thrombin.
• Testing the agent's response to thrombin-spiked blood.
• Evaluating activation time and detection limits in clotting blood models.
• Utilizing ultrasound harmonic signal generation for detection.

Main Results:

• The microbubble agent produces ultrasound harmonic signals specifically in the presence of thrombin.
• Activation occurred within three minutes in both thrombin-spiked and freshly clotting blood.
• Achieved detection limits of 20 nM for thrombin and 2 aM for microbubbles.

Conclusions:

• The developed microbubble contrast agent shows promise for sensitive and rapid ultrasound-based detection of thrombosis.
• This technology could significantly improve the diagnosis of thrombosis-related conditions.
• Further research may lead to clinical applications in cardiovascular and cancer diagnostics.