1
|
Hu F, Wang D, Ma X, Hu T, Yue Y, Tang W, Wu P, Tong T, Peng W. Concurrent Dual-Contrast Enhancement Using Fe 3O 4 Nanoparticles to Achieve a CEST Signal Controllability. ACS OMEGA 2023; 8:24153-24164. [PMID: 37457473 PMCID: PMC10339402 DOI: 10.1021/acsomega.2c07000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 02/13/2023] [Indexed: 07/18/2023]
Abstract
Traditional T2 magnetic resonance imaging (MRI) contrast agents have defects inherent to negative contrast agents, while chemical exchange saturation transfer (CEST) contrast agents can quantify substances at trace concentrations. After reaching a certain concentration, iron-based contrast agents can "shut down" CEST signals. The application range of T2 contrast agents can be widened through a combination of CEST and T2 contrast agents, which has promising application prospects. The purpose of this study is to develop a T2 MRI negative contrast agent with a controllable size and to explore the feasibility of dual contrast enhancement by combining T2 with CEST contrast agents. The study was carried out in vitro with HCT-116 human colon cancer cells. A GE SIGNA Pioneer 3.0 T medical MRI scanner was used to acquire CEST images with different saturation radio-frequency powers (1.25/2.5/3.75/5 μT) by 2D spin echo-echo planar imaging (SE-EPI). Magnetic resonance image compilation (MAGiC) was acquired by a multidynamic multiecho 2D fast spin-echo sequence. The feasibility of this dual-contrast enhancement method was assessed by scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, dynamic light scattering, ζ potential analysis, inductively coupled plasma, X-ray photoelectron spectroscopy, X-ray powder diffraction, vibrating-sample magnetometry, MRI, and a Cell Counting Kit-8 assay. The association between the transverse relaxation rate r2 and the pH of the iron-based contrast agents was analyzed by linear fitting, and the linear relationship between the CEST effect in different B1 fields and pH was analyzed by the ratio method. Fe3O4 nanoparticles (NPs) with a mean particle size of 82.6 ± 22.4 nm were prepared by a classical process, and their surface was successfully modified with -OH active functional groups. They exhibited self-aggregation in an acidic environment. The CEST effect was enhanced as the B1 field increased, and an in vitro pH map was successfully plotted using the ratio method. Fe3O4 NPs could stably serve as reference agents at different pH values. At a concentration of 30 μg/mL, Fe3O4 NPs "shut down" the CEST signals, but when the concentration of Fe3O4 NPs was less than 10 μg/mL, the two contrast agents coexisted. The prepared Fe3O4 NPs had almost no toxicity, and when their concentration rose to 200 μg/mL at pH 6.5 or 7.4, they did not reach the half-maximum inhibitory concentration (IC50). Fe3O4 magnetic NPs with a controllable size and no toxicity were successfully synthesized. By combining Fe3O4 NPs with a CEST contrast agent, the two contrast agents could be imaged simultaneously; at higher concentrations, the iron-based contrast agent "shut down" the CEST signal. An in vitro pH map was successfully plotted by the ratio method. CEST signal inhibition can be used to realize the pH mapping of solid tumors and the identification of tumor active components, thus providing a new imaging method for tumor efficacy evaluation.
Collapse
Affiliation(s)
- Feixiang Hu
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Dan Wang
- Department
of Ultrasound, Shanghai Municipal Hospital of Traditional Chinese
Medicine, Shanghai University of Traditional
Chinese Medicine, Shanghai, People’s Republic of China. 200071
| | - Xiaowen Ma
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Tingdan Hu
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Yali Yue
- Department
of Radiology, Children’s Hospital
of Fudan University, Shanghai, People’s Republic of China 200000
| | - Wei Tang
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - PuYe Wu
- GE
Healthcare, Beijing, People’s Republic of China 100176
| | - Tong Tong
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| | - Weijun Peng
- Department
of Radiology, Fudan University Shanghai Cancer Center, Department
of Oncology, Shanghai Medical College, Fudan
University, Shanghai, People’s Republic of China 200032
| |
Collapse
|
2
|
Tu TT, Sun Y, Lei YM, Chai YQ, Zhuo Y, Yuan R. Pyrenecarboxaldehyde encapsulated porous TiO 2 nanoreactors for monitoring cellular GSH levels. NANOSCALE 2022; 14:5751-5757. [PMID: 35348164 DOI: 10.1039/d2nr00784c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Recently, ternary electrochemiluminescence (ECL) system has become a hot research topic due to its great potential for improving ECL efficiency by promoting the generation of intermediates. However, it is still a great challenge to increase the utilization rate of intermediates in a ternary ECL system. Herein, we propose a strategy to increase the utilization rate of intermediates by designing pyrenecarboxaldehyde (Pyc) encapsulated porous titania (pTiO2) nanospheres (Pyc@pTiO2) as ECL nanoreactors for an integrated ternary (luminophore/coreactant/co-reaction accelerator, Pyc/S2O82-/TiO2) ECL system construction. Specifically, pTiO2 acted as an ECL co-reaction accelerator, in which Pyc could obtain electrons from the conduction band of TiO2 to produce more SO4˙-, increasing its emissions. Simultaneously, pTiO2 could provide confined reaction spaces to effectively shorten the diffusion distance, extend the lifetime of free radicals, increase the utilization rate of intermediates and improve the efficiency of the ternary ECL system. As a proof of concept, the Pyc@pTiO2 nanoreactors-based sensing platform was successfully constructed to sensitively monitor cellular GSH levels. Overall, this work for the first time proposed an avenue to increase the utilization rate of intermediates in a ternary ECL system, which opened a new route for ECL biosensing in cell analysis applications.
Collapse
Affiliation(s)
- Ting-Ting Tu
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| | - Yuan Sun
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| | - Yan-Mei Lei
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| | - Ya-Qin Chai
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| | - Ying Zhuo
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| | - Ruo Yuan
- Key Laboratory of Luminescence Analysis and Molecular Sensing (Southwest University), Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing, 400715, China.
| |
Collapse
|
3
|
Yu H, Wu C, Yuan X, Yang F, Zhang F, Yin H. Hollow and mesoporous aluminosilica-encapsulated Pt-CoO x for the selective hydrogenation of substituted nitroaromatics. Chem Commun (Camb) 2021; 57:9116-9119. [PMID: 34498615 DOI: 10.1039/d1cc02777h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hollow and mesoporous aluminosilica nanoreactors (HMANs) with Pt-CoOx cores (∼4.7 nm) and hollow aluminosilica shells (∼50 nm) were designed by a selective etching method. The Pt-CoOx@HMANs demonstrate a greatly enhanced activity and selectivity for the hydrogenation of various substituted nitroaromatics compared to Pt@HMANs and Pt-CoOx@SiO2.
Collapse
Affiliation(s)
- Hongbo Yu
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. 11219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. China.
| | - Chunzheng Wu
- College of Sciences, Zhejiang A&F University, Hangzhou, Zhejiang 311300, P. R. China
| | - Xuemin Yuan
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. 11219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. China.
| | - Fan Yang
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. 11219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. China.
| | - Fei Zhang
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. 11219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. China.
| | - Hongfeng Yin
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 1219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. 11219 Zhongguan West Road, Ningbo, Zhejiang 315201, P. R. China.
| |
Collapse
|