Recent technological advances in microscopy have facilitated novel approaches to investigate host-pathogen interactions. In particular, improvements in both microscope hardware and engineered biosensors have helped to overcome barriers to live-cell imaging with fluorescence microscopy. Live fluorescent microscopy allows for the detection of discrete signaling events and protein localization, improving our ability to assess the effects of pharmacologic agents, microbes, or infection with high temporal resolution. Here we describe a protocol for long-term live-cell fluorescence imaging of virus infected cell lines.
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http://dx.doi.org/10.1007/978-1-0716-3617-6_3 | DOI Listing |
Elife
January 2025
Eikon Therapeutics Inc, Hayward, United States.
The regulation of cell physiology depends largely upon interactions of functionally distinct proteins and cellular components. These interactions may be transient or long-lived, but often affect protein motion. Measurement of protein dynamics within a cellular environment, particularly while perturbing protein function with small molecules, may enable dissection of key interactions and facilitate drug discovery; however, current approaches are limited by throughput with respect to data acquisition and analysis.
View Article and Find Full Text PDFLately, important advancements in visualizing RNAs in fixed and live cells have been achieved. While mRNA imaging techniques are well-established, the development of effective methods for studying non-coding RNAs (ncRNAs) in living cells are still challenging but necessary, as they show a variety of functions and intracellular localizations, including participation in highly dynamic processes like phase-transition, which is still poorly studied in vivo. Addressing this issue, we tagged two exemplary ncRNAs with the fluorescent RNA (fRNA) Pepper.
View Article and Find Full Text PDFNucleic Acids Res
January 2025
Department of Biological Sciences, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea.
Serum response factor (SRF) is a master transcription factor that regulates immediate early genes and cytoskeletal remodeling genes. Despite its importance, the mechanisms through which SRF stably associates with its cognate promoter remain unknown. Our biochemical and protein-induced fluorescence enhancement analyses showed that the binding of SRF to serum response element was significantly increased by inositol polyphosphate multikinase (IPMK), an SRF cofactor.
View Article and Find Full Text PDFJ Phys Chem Lett
January 2025
College of Physics and Optoelectronic Engineering, Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, State Key Laboratory of Radio Frequency Heterogeneous Integration (Shenzhen University), Shenzhen University, Shenzhen 518060, P. R. China.
One of the most significant advances in stimulated emission depletion (STED) super-resolution microscopy is its capacity for dynamic super-resolution imaging of living cells, including the long-term tracking of interactions between various cells or organelles. Consequently, the multicolor STED plays a pivotal role in biological research. Despite the emergence of numerous fluorescent probes characterized by low toxicity, high stability, high brightness, and exceptional specificity, enabling dynamic imaging of living cells with multicolor STED, practical implementation of multicolor STED for live-cell imaging is influenced by several factors.
View Article and Find Full Text PDFACS Appl Mater Interfaces
January 2025
State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University (NPU), Xi'an 710072, China.
Gold nanoclusters (AuNCs) have garnered significant attention in biomedical applications, particularly in biosensing, cancer therapy, and imaging, due to their unique optical property, good biocompatibility, and distinct bioactivity. Understanding the cellular uptake behavior of AuNCs is critical to improve the efficacy of their applications, whose mechanism has not been adequately validated. In this work, we synthesized AuNCs with varying surface modifications to quantify the exact law of surface charge on the cellular uptake of AuNCs in a multidimensional manner by using 3D multicellular tumor spheroids of both HeLa cells and MCF-7 cells as the model system.
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