研究目的
To develop an upconversion optogenetic nanosystem for remotely up-regulating autophagy with spatiotemporal precision using near-infrared light.
研究成果
The upconversion optogenetic nanosystem successfully up-regulated autophagy with spatiotemporal precision in vitro and in vivo using NIR light, demonstrating excellent biocompatibility and potential for clinical applications in autophagy-related diseases.
研究不足
The study may have limitations in long-term stability and biocompatibility of the UCRs-capsule in vivo, potential thermal effects from NIR laser, and the need for surgical implantation which could introduce stress. Optimization could focus on minimizing invasiveness and improving material durability.
1:Experimental Design and Method Selection:
The study designed an upconversion optogenetic nanosystem consisting of upconversion rods (UCRs) encapsulated in a flexible capsule (UCRs-capsule) to convert NIR light to blue light, and optogenetic plasmids (p53-Cry2 and NLS-Cib1) to induce protein-protein interaction and autophagy up-regulation. Methods included cell culture, transfection, confocal microscopy, western blotting, flow cytometry, and in vivo mouse models.
2:Sample Selection and Data Sources:
HeLa and 293T cell lines were used for in vitro experiments. Female BALB/C nude mice with HeLa cell tumors were used for in vivo studies. Data were collected from fluorescence imaging, protein assays, and RNA sequencing.
3:List of Experimental Equipment and Materials:
Equipment included confocal microscope (PerkinElmer), fluorescence spectrophotometer (Cnilaser), SEM (Nanosem430), flow cytometer (BD FACSCalibur), microplate reader (Thermo Scientific). Materials included UCRs (synthesized with rare-earth elements), PDMS (Sylgard 184), PET film (Chenglida), plasmids (constructed by GENEWIZ), antibodies (e.g., LC3 from proteintech), and reagents (e.g., Lipofectamine2000 from Invitrogen).
4:Experimental Procedures and Operational Workflow:
Cells were transfected with plasmids, exposed to light (LED blue or NIR laser), and analyzed for protein localization and autophagy markers. In vivo, mice were implanted with UCRs-capsule, transfected intratumorally, irradiated with NIR light, and tissues were analyzed post-sacrifice.
5:Data Analysis Methods:
Data were analyzed using ImageJ, AzureSpot software, Excel, OriginPro8.0, FLOWJO for flow cytometry, and DAVID for GO analysis. Statistical significance was assessed with t-tests.
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confocal microscope
Nanosem430
PerkinElmer
Used for live-cell imaging and observation in confocal microscopy experiments.
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PDMS
Sylgard 184
Dow Corning
Used as a flexible material for encapsulating UCRs in the UCRs-capsule.
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fluorescence spectrophotometer
Cnilaser
Measured the fluorescence spectrum of UCRs with excitation at 980nm.
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flow cytometer
FACSCalibur
BD
Used for apoptosis detection via Annexin V and PI staining.
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microplate reader
Thermo Scientific
Detected absorbancy in MTT assays for cell viability.
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Lipofectamine
2000
Invitrogen
Transfection reagent for plasmid delivery into cells.
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PET film
Chenglida
Substrate for the UCRs-capsule fabrication.
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NIR laser
Used to excite UCRs for upconversion to visible light.
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LED array
Used as a blue light source for optogenetic activation in vitro.
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