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Liu Y, Ding Y, Alonas E, Zhao W, Santangelo PJ, Jin D, Piper JA, Teng J, Ren Q, Xi P. Achieving λ/10 resolution CW STED nanoscopy with a Ti:Sapphire oscillator. PLoS One 2012; 7:e40003. [PMID: 22761944 PMCID: PMC3384643 DOI: 10.1371/journal.pone.0040003] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2012] [Accepted: 05/30/2012] [Indexed: 02/01/2023] Open
Abstract
In this report, a Ti:Sapphire oscillator was utilized to realize synchronization-free stimulated emission depletion (STED) microscopy. With pump power of 4.6 W and sample irradiance of 310 mW, we achieved super-resolution as high as 71 nm. With synchronization-free STED, we imaged 200 nm nanospheres as well as all three cytoskeletal elements (microtubules, intermediate filaments, and actin filaments), clearly demonstrating the resolving power of synchronization-free STED over conventional diffraction limited imaging. It also allowed us to discover that, Dylight 650, exhibits improved performance over ATTO647N, a fluorophore frequently used in STED. Furthermore, we applied synchronization-free STED to image fluorescently-labeled intracellular viral RNA granules, which otherwise cannot be differentiated by confocal microscopy. Thanks to the widely available Ti:Sapphire oscillators in multiphoton imaging system, this work suggests easier access to setup super-resolution microscope via the synchronization-free STED.
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Affiliation(s)
- Yujia Liu
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
| | - Yichen Ding
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
| | - Eric Alonas
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Wenli Zhao
- College of Life Sciences, Peking University, Beijing, China
| | - Philip J. Santangelo
- Wallace H Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia, United States of America
| | - Dayong Jin
- Advanced Cytometry Labs, MQphotonics Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - James A. Piper
- Advanced Cytometry Labs, MQphotonics Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Junlin Teng
- College of Life Sciences, Peking University, Beijing, China
| | - Qiushi Ren
- School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai, China
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
| | - Peng Xi
- Department of Biomedical Engineering, College of Engineering, Peking University, Beijing, China
- * E-mail:
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Wedlock LE, Berners-Price SJ. Recent Advances in Mapping the Sub-cellular Distribution of Metal-Based Anticancer Drugs. Aust J Chem 2011. [DOI: 10.1071/ch11132] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
There are increasing reports of novel metal-based chemotherapeutics that have either improved cancer cell selectivity, or alternative mechanisms of action, to existing anticancer drugs, and techniques are required for determining their sub-cellular molecular targets. Imaging methods offer many distinct advantages over destructive fractionation techniques, including the preservation of useful morphological information; however, mapping the intracellular distribution of metal ions inside tumour cells still remains challenging. Recent advances in three modes of imaging are discussed in this review, with a particular focus on the application to metal-based cancer chemotherapy – fluorescence microscopy, electron microscopy (including energy-filtered transmission electron microscopy (EFTEM)), and a new technique, Nano-scale secondary ion mass spectrometry (NanoSIMS).
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