Dual-Mode Dark Field and Surface-Enhanced Raman Scattering Liposomes for Lymphoma and Leukemia Cell Imaging.

Area of Science:

• Nanotechnology
• Biomedical Engineering
• Optical Microscopy
• Spectroscopy

Background:

• Characterizing individual cells requires multifunctional probes capable of simultaneous analysis by diverse techniques.
• Liposomes offer a versatile platform for developing targeted probes due to their biocompatibility and modular nature.
• Combining imaging and spectroscopic methods can provide complementary information for precise cellular analysis.

Purpose of the Study:

• To develop and demonstrate a dual-function liposome probe integrating dark field microscopy and surface-enhanced Raman scattering (SERS) for cancer cell detection.
• To establish methods for conjugating antibodies to SERS-active liposomes for targeted cellular imaging.
• To evaluate the probe's efficacy as an optical contrast agent for both lymphoma and chronic lymphocytic leukemia (CLL) cells.

Main Methods:

• Fabrication of SERS-active liposomes using zwitterionic lipids to minimize biofouling and incorporate functional molecules.
• Development of two antibody conjugation strategies: direct surface conjugation and post-insertion of antibody fragments (Fabs).
• In vitro testing of the dual-function probes on lymphoma cell line LY10 and primary human CLL cells.

Main Results:

• Successful preparation of dual-function liposome probes with combined dark field microscopy and SERS capabilities.
• Demonstrated effective antibody conjugation to SERS liposomes via two distinct methods.
• In vitro experiments confirmed the probes' utility as optical contrast agents, enhancing visualization of targeted cancer cells in both imaging modalities.

Conclusions:

• The developed dual-function liposome probes represent a novel approach for simultaneous cellular characterization using dark field microscopy and SERS.
• The modular nature of liposomes allows for versatile functionalization, enabling targeted delivery and multimodal imaging.
• These probes show significant potential for advancing cancer diagnostics and research by providing enhanced optical contrast and complementary information from individual cells.