研究目的
To develop a method for light-activated delivery of the Bcl-2 functional converting peptide NuBCP-9 using hollow gold nanoshells to overcome delivery challenges and chemoresistance in cancer therapy.
研究成果
The HGN-based delivery system for NuBCP-9 enables light-controlled release, increasing peptide efficacy by 30-fold in vitro and reducing tumor growth by 56.4% in vivo, demonstrating potential for targeting Bcl-2-expressing resistant cancers with improved specificity and reduced therapeutic doses.
研究不足
The release efficiency of the peptide from HGNs is only up to 22% in cell-free studies, and the method requires specific laser equipment and conditions, which may limit clinical applicability. Potential heating effects from HGN irradiation could cause non-specific cell damage.
1:Experimental Design and Method Selection:
The study uses hollow gold nanoshells (HGNs) as a delivery vehicle for the NuBCP-9 peptide, with light-activated release via near-infrared (NIR) irradiation. Orthogonal surface chemistry is employed for peptide loading and internalization.
2:Sample Selection and Data Sources:
Cancer cell lines including HeLa, MDA-MB-231, and H460 paclitaxel-resistant (PacR) cells are used. Zebrafish embryos serve as an in vivo model for xenograft studies.
3:List of Experimental Equipment and Materials:
HGNs synthesized via galvanic replacement, peptides (NuBCP-9, TAT), DNA strands, streptavidin, dyes (Cy5, FAM, JC-1), lasers (Ti:sapphire femtosecond pulsed laser), microscopes (Olympus BX51, Zeiss LSM 780 confocal), plate reader (Tecan M200).
4:0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: HGN synthesis, surface modification with DNA and peptides, cellular internalization studies, laser irradiation for peptide release, viability assays (PrestoBlue), mitochondrial depolarization assays (JC-1), and in vivo zebrafish xenograft experiments with imaging and laser treatment.
5:Data Analysis Methods:
Fluorescence quantification using calibration curves, image analysis with Fiji (ImageJ) software, statistical analysis including two-way ANOVA with Sidak's multiple comparisons test.
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Confocal microscope
LSM 780
Zeiss
Imaging and laser irradiation in cells and zebrafish
ZEISS LSM 990 Spectral Multiplex
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Microscope
BX51
Olympus
Dark field microscopy for internalization studies
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Hollow Gold Nanoshells
HGN
Delivery vehicle for peptide, enables light-activated release
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Ti:sapphire laser
Mai Tai HP
Newport-Spectra Physics
NIR irradiation for peptide release
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Plate reader
M200
Tecan
Fluorescence quantification
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JC-1 dye
ThermoFisher
Mitochondrial depolarization assay
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PrestoBlue viability stain
Cell viability assay
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CM-DiI cell tracker dye
ThermoFisher Science
Cell labeling for xenograft studies
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