An AND-gate bioluminescent probe for precise tumor imaging.

Area of Science:

• Biomedical Imaging
• Molecular Probes
• Diagnostic Accuracy

Background:

• Diagnostic accuracy relies on sensitivity and specificity.
• Dual-locked probes with AND-gate logic improve imaging specificity and reduce false positives.
• Bioluminescence imaging (BLI) offers high sensitivity and low background for precise disease detection.

Purpose of the Study:

• To develop a novel AND-gate bioluminescent probe, FK-Luc-BH.
• To achieve precise tumor imaging by responding to two distinct biomarkers.
• To enhance specificity in disease diagnosis using dual-biomarker recognition.

Main Methods:

• Development of a novel AND-gate bioluminescent probe, FK-Luc-BH.
• Validation of probe specificity using solutions with individual and combined biomarkers (cathepsin L and ClO-).
• In vitro and in vivo testing using 4T1-fLuc cells and tumors, comparing FK-Luc-BH with control compounds and scavengers/inhibitors.

Main Results:

• FK-Luc-BH demonstrated high specificity, producing a bioluminescence signal only when both cathepsin L (CTSL) and ClO- were present.
• Significantly higher BL signals were observed in 4T1-fLuc cells and tumors treated with FK-Luc-BH compared to controls.
• The probe's specificity was confirmed by the lack of signal when treated with a ClO- scavenger or cathepsin inhibitor.

Conclusions:

• FK-Luc-BH effectively functions as an AND-gate probe, responding to the simultaneous presence of CTSL and ClO-.
• This novel probe enables precise tumor recognition in environments where both biomarkers coexist.
• The FK-Luc-BH probe holds promise for improving diagnostic accuracy in diseases characterized by these specific biomarkers.