Abstract
Optical imaging is crucial to study biological or pathological processes and diagnose diseases. However, poor tissue penetration typically limits conventional optical imaging. Here we report an imaging technique that uses ultrasound to activate luminescent molecules or nanoparticles through two-step intraparticle energy conversion. Ultrasonic activation can convert mechanical fluctuations into chemical energy via the piezoelectric effect and then induce luminescence via the chemiluminescent effect. We demonstrate two modalities for ultrasound-induced luminescence imaging: one achieves delayed imaging after cessation of the ultrasonic excitation, and the other enables real-time imaging during the ultrasonic excitation. Our imaging modality offers an improvement in luminescence intensity of up to 2,000-fold compared with sonoluminescence of H2O, a 10-fold improved of signal-to-noise ratio compared with fluorescence imaging, a spatial resolution of 1.46 mm and tissue penetration of up to 2.2 cm. We demonstrate its applicability for imaging subcutaneous and orthotopic tumours, mapping lymph nodes and screening peritoneal metastatic tumours. Furthermore, we design analyte-activatable luminescence probes based on resonance energy transfer, which can assess drug-induced hepatotoxicity and distinguish the responsivity of tumours after drug treatment. We expect that our technique will enable further preclinical and clinical applications, such as the study of histopathological lesions in living animals, the early detection of tumours, the profiling of biological molecules and the monitoring of cancer treatment or prognosis, among others.
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Data availability
All of the data that support the findings of this study are reported in the main text and Supplementary Information. The data that support the findings of this study are available from the corresponding author upon reasonable request, and data for all figures can be found at https://doi.org/10.6084/m9.figshare.24579853. Source data are provided with this paper.
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Acknowledgements
This work was supported by the National Key R&D Program of China (grant no. 2019YFA0210100 (to X.-B.Z.)) and the National Natural Science Foundation of China (grant nos U21A20287 (to G.S.) and 22234003 and 21890744 (to X.-B.Z.)).
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J.G. and Z.L. synthesized the TD molecules. S.X. and Y.F. synthesized the HBA-COOH molecules. Y.L. synthesized the BODIPY, BODIPY-Br and HD molecules. Z.L. and B.Y. synthesized the BTz-IC-H, BTz-IC-F and BTz-IC-Cl molecules. Y.W. and S.L. conducted all experiments in solution. Y.W., S.L. and Q.R. built all of the animal models and conducted all of the animal experiments. Y.W., Z.L. and S.L. synthesized all nanoparticles. Y.W. collected the raw data in all experiments and designed the schematic diagram. G.S. conceived the idea for this project. G.S. and Y.W. designed the research and all experiments. Y.W. and G.S. analysed all of the data and interpreted the results. Y.W., G.S., X.-B.Z. and W.T. wrote the paper. G.S., X.-B.Z., W.T. and Y.W. developed the discussion. G.S. supervised all experiments. Z.Y. and X.L. helped to analyse the luminescence mechanism and wrote the paper. All authors provided critical feedback on the research and the paper.
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Extended data
Extended Data Fig. 1
Schematic diagram of set up apparatus for the mode of “delayed ultrasound-induced luminescence imaging” and “real-time ultrasound-induced luminescence imaging”.
Extended Data Fig. 2 Design of composite nanoparticles to enhance ultrasound-induced luminescence, in the mode of “delayed ultrasound-induced luminescence imaging”.
a, Schematic diagram for design of composite nanoparticles by luminescent molecule (PFODBT) and chemiluminescent substrates. b, TEM image revealed spherical PFODBT@HBA-NPs. c, Ultrasound-induced luminescence intensity of various chemiluminescent substrates doped PFODBT-NPs (50 μg mL–1, 400 µL) pre-excited with ultrasound (30 kHz, 4.5 W cm–2) for 45 s. d, Ultrasound-induced luminescence intensity of PFODBT@HBA-NPs with different ratios of HBA-COOH: PFODBT, nanoparticle solutions (50 μg/mL, 200 µL) were pre-excited with ultrasound (30 kHz, 4.5 W/cm2) for 15 s. e, Ultrasound-induced luminescence intensity of PFODBT@HBA-NPs with different surfactants, those nanoparticles (50 μg mL–1, 400 μL) were pre-excited with ultrasound (30 kHz, 4.5 W cm–2) for 30 s. f, Ultrasound-induced luminescence emission of PFODBT@HBA-NPs (PFODBT: HBA-COOH = 1: 1, 25 μg mL–1, 200 µL) in different channels, pre-excited with ultrasound (30 kHz, 4.5 W cm–2) for 15 s. g, Ultrasound-induced luminescence intensity of PFODBT@HBA-NPs (6.25 μg mL–1, 200 µL) after different time of ultrasonic excitation (30 kHz, 4.5 W cm–2). h, Ultrasound-induced luminescence intensity of various concentrations of PFODBT@HBA-NPs pre-excited with ultrasound (30 kHz, 4.5 W cm–2) for 15 s. Data for d–g are presented as mean values ± s.d. (n = 3).
Extended Data Fig. 3 Mechanism for ultrasound-induced luminescence of PFODBT@HBA-NPs.
a, Ultrasound-induced luminescence intensity of HBA-COOH-NPs, PFODBT-NPs, PFODBT@HBA-NPs (50 μg mL–1, 400 µL), pre-excited with ultrasound (30 kHz, 4.5 W cm–2) for 45 s. Data are presented as mean values ± s.d. (n = 3). b, Luminescence intensity of PFODBT@HBA-NPs (12.5 μg mL–1, 100 µL) excited by heating at various temperatures (for example, 10, 20, and 40 oC) or ultrasonic excitation (30 kHz, 4.5 W cm–2 for 15 s). c, Temperatures of PFODBT@HBA-NPs after receiving different times of ultrasonic excitation (30 kHz, 6.5 W cm–2), as measured by an infrared thermal camera. d, Reproducible voltage output of PFODBT when the ultrasonic transducer (30 kHz) was turned on and off. e, ESR spectra of 1O2 generated from PFODBT-NPs (200 µg mL–1, 100 µL) and trapping by 4-oxo-2,2,6,6-tetramethylpiperidine (TEMP) (1 M, 100 µL) before or after ultrasonic excitation. f, ESR spectra of •OH generated from PFODBT-NPs (200 μg mL–1, 100 μL) and trapped by dimethyl-1-pyrroline N-oxide (DMPO) (1 M, 100 μL) in water before or after ultrasonic excitation. g, Schematic diagram of ultrasound-induced luminescence mechanism for PFODBT@HBA-NPs.
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Wang, Y., Yi, Z., Guo, J. et al. In vivo ultrasound-induced luminescence molecular imaging. Nat. Photon. 18, 334–343 (2024). https://doi.org/10.1038/s41566-024-01387-1
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DOI: https://doi.org/10.1038/s41566-024-01387-1
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