Maltodextrin-based imaging probes detect bacteria in vivo with high sensitivity and specificity

Area of Science:

• Medical Imaging
• Infectious Disease Diagnostics
• Biotechnology

Background:

• Diagnosing bacterial infections is a significant medical challenge.
• Existing imaging agents lack sensitivity and specificity, failing to distinguish infections from other conditions.
• There is a critical need for advanced diagnostic tools for bacterial infections.

Purpose of the Study:

• To develop novel contrast agents for highly sensitive and specific in vivo imaging of bacteria.
• To overcome the limitations of current diagnostic methods for bacterial infections.
• To create a tool for differentiating bacterial infections from inflammation and other pathologies.

Main Methods:

• Development of maltodextrin-based imaging probes (MDPs) by conjugating fluorescent dyes to maltohexaose.
• Utilizing the bacteria-specific maltodextrin transport pathway for probe internalization.
• Evaluating MDP sensitivity, specificity, and ability to discriminate between active bacteria and inflammation in vivo.

Main Results:

• MDPs demonstrated a two-orders-of-magnitude higher sensitivity for detecting bacteria compared to previous agents.
• MDPs exhibit high specificity, accumulating in bacteria at millimolar concentrations and being 1000-fold more specific than for mammalian cells.
• MDPs successfully imaged as few as 10^5 colony-forming units and differentiated active bacterial infections from inflammation.

Conclusions:

• Maltodextrin-based imaging probes (MDPs) represent a significant advancement in bacterial infection diagnostics.
• MDPs offer unprecedented sensitivity and specificity, enabling detection of low bacterial loads and differentiation from non-bacterial pathologies.
• This technology holds promise for improving the early and accurate diagnosis of bacterial infections in clinical settings.