Simple strategy for single-chain fragment antibody-conjugated probe construction.

Area of Science:

• Biomedical Engineering
• Molecular Imaging
• Nanotechnology

Background:

• Accurate cancer diagnosis relies on biomarker and instrument technology, particularly antigen-targeted imaging.
• Current antibody-imaging material conjugation methods limit targeting efficiency.
• Improved conjugation strategies are needed for effective tumor imaging probes.

Purpose of the Study:

• To develop a simple and efficient strategy for conjugating single-chain fragment antibodies (scFv) with imaging materials.
• To create novel antigen-targeted imaging probes without compromising antibody characteristics.
• To enhance the accuracy of cancer diagnosis through improved imaging probe technology.

Main Methods:

• Conjugation of scFv with superparamagnetic iron oxide (SPIO) or indocyanine green (ICG) using a cysteine-maleimide reaction.
• Characterization of conjugated probes via flow cytometry, confocal, optical, and magnetic resonance imaging (MRI).

Main Results:

• The conjugated scFv maintained high affinity, antigen specificity, and internalization ability.
• Successful application of the conjugated probes demonstrated by optical imaging and MRI.
• Validated the efficacy of the novel conjugation strategy for imaging.

Conclusions:

• The proposed strategy offers a straightforward method for producing high-efficiency antigen-targeted imaging probes.
• This advancement facilitates improved tumor diagnosis through enhanced imaging capabilities.
• The developed probes show significant potential for clinical application in cancer detection.