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Ren L, Liu Y, Yao T, Nguyen KT, Yuan B. In vivo tumor ultrasound-switchable fluorescence imaging via intravenous injections of size-controlled thermosensitive nanoparticles. Nano Res 2023; 16:1009-1020. [PMID: 38098888 PMCID: PMC10720766 DOI: 10.1007/s12274-022-4846-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 05/13/2022] [Accepted: 08/01/2022] [Indexed: 12/17/2023]
Abstract
Near-infrared fluorescence imaging has emerged as a noninvasive, inexpensive, and ionizing-radiation-free monitoring tool for assessing tumor growth and treatment efficacy. In particular, ultrasound switchable fluorescence (USF) imaging has been explored with improved imaging sensitivity and spatial resolution in centimeter-deep tissues. This study achieved size control of polymer-based and indocyanine green (ICG) encapsulated USF contrast agents, capable of accumulating at the tumor after intravenous injections. These nanoprobes varied in size from 58 nm to 321 nm. The bioimaging profiles demonstrated that the proposed nanoparticles can efficiently eliminate the background light from normal tissue and show a tumor-specific fluorescence enhancement in the BxPC-3 tumor-bearing mice models possibly via the enhanced permeability and retention effect. In vivo tumor USF imaging further proved that these nanoprobes can effectively be switched 'ON' with enhanced fluorescence in response to a focused ultrasound stimulation in the tumor microenvironment, contributing to the high-resolution USF images. Therefore, our findings suggest that ICG-encapsulated nanoparticles are good candidates for USF imaging of tumors in living animals, indicating their great potential in optical tumor imaging in deep tissue.
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Affiliation(s)
- Liqin Ren
- Ultrasound and Optical Imaging Laboratory, Department of Bioengineering, the University of Texas at Arlington, Arlington, TX 76019, USA
- Joint Biomedical Engineering Program, the University of Texas at Arlington and the University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yang Liu
- Ultrasound and Optical Imaging Laboratory, Department of Bioengineering, the University of Texas at Arlington, Arlington, TX 76019, USA
- Joint Biomedical Engineering Program, the University of Texas at Arlington and the University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Tingfeng Yao
- Ultrasound and Optical Imaging Laboratory, Department of Bioengineering, the University of Texas at Arlington, Arlington, TX 76019, USA
- Joint Biomedical Engineering Program, the University of Texas at Arlington and the University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Kytai T. Nguyen
- Joint Biomedical Engineering Program, the University of Texas at Arlington and the University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
- Department of Bioengineering, the University of Texas at Arlington, Arlington, TX 76019, USA
| | - Baohong Yuan
- Ultrasound and Optical Imaging Laboratory, Department of Bioengineering, the University of Texas at Arlington, Arlington, TX 76019, USA
- Joint Biomedical Engineering Program, the University of Texas at Arlington and the University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
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Kandukuri J, Yu S, Cheng B, Bandi V, D'Souza F, Nguyen KT, Hong Y, Yuan B. A Dual-Modality System for Both Multi-Color Ultrasound-Switchable Fluorescence and Ultrasound Imaging. Int J Mol Sci 2017; 18:E323. [PMID: 28165390 DOI: 10.3390/ijms18020323] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Revised: 12/29/2016] [Accepted: 01/24/2017] [Indexed: 12/21/2022] Open
Abstract
Simultaneous imaging of multiple targets (SIMT) in opaque biological tissues is an important goal for molecular imaging in the future. Multi-color fluorescence imaging in deep tissues is a promising technology to reach this goal. In this work, we developed a dual-modality imaging system by combining our recently developed ultrasound-switchable fluorescence (USF) imaging technology with the conventional ultrasound (US) B-mode imaging. This dual-modality system can simultaneously image tissue acoustic structure information and multi-color fluorophores in centimeter-deep tissue with comparable spatial resolutions. To conduct USF imaging on the same plane (i.e., x-z plane) as US imaging, we adopted two 90°-crossed ultrasound transducers with an overlapped focal region, while the US transducer (the third one) was positioned at the center of these two USF transducers. Thus, the axial resolution of USF is close to the lateral resolution, which allows a point-by-point USF scanning on the same plane as the US imaging. Both multi-color USF and ultrasound imaging of a tissue phantom were demonstrated.
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