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Jian CB, Wu YY, Lin MH, Gao HD, Chen CY, Leong SK, Tzou DLM, Hwang DW, Lee HM. A Facile NMR Method for Pre-MRI Evaluation of Trigger-Responsive T 1 Contrast Enhancement. Small Methods 2024:e2301603. [PMID: 38459640 DOI: 10.1002/smtd.202301603] [Citation(s) in RCA: 0] [Impact Index Per Article: 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: 11/20/2023] [Revised: 02/09/2024] [Indexed: 03/10/2024]
Abstract
There is a growing interest in developing paramagnetic nanoparticles as responsive magnetic resonance imaging (MRI) contrast agents, which feature switchable T1 image contrast of water protons upon biochemical cues for better discerning diseases. However, performing an MRI is pragmatically limited by its cost and availability. Hence, a facile, routine method for measuring the T1 contrast is highly desired in early-stage development. This work presents a single-point inversion recovery (IR) nuclear magnetic resonance (NMR) method that can rapidly evaluate T1 contrast change by employing a single, optimized IR pulse sequence that minimizes water signal for "off-state" nanoparticles and allows for sensitively measuring the signal change with "switch-on" T1 contrast. Using peptide-induced liposomal gadopentetic acid (Gd3+ -DTPA) release and redox-sensitive manganese oxide (MnO2 ) nanoparticles as a demonstration of generality, this method successfully evaluates the T1 shortening of water protons caused by liposomal Gd3+ -DTPA release and Mn2+ formation from MnO2 reduction. Furthermore, the NMR measurement is highly correlated to T1 -weighted MRI scans, suggesting its feasibility to predict the MRI results at the same field strength. This NMR method can be a low-cost, time-saving alternative for pre-MRI evaluation for a diversity of responsive T1 contrast systems.
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Affiliation(s)
- Cheng-Bang Jian
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
- Nano Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Taiwan University, Taipei, 11529, Taiwan
- Department of Chemistry, National Taiwan University, Taipei, 10617, Taiwan
| | - Ying-Yann Wu
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Ming-Huang Lin
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Hua-De Gao
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Chong-Yan Chen
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Shwee Khuan Leong
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
- Sustainable Chemical Science and Technology Program, Taiwan International Graduate Program, Academia Sinica and National Yang Ming Chiao Tung University, Taipei, 11529, Taiwan
- Department of Applied Chemistry, National Yang Ming Chiao Tung University, Hsinchu, 30093, Taiwan
| | - Der-Lii M Tzou
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
| | - Dennis W Hwang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, 11529, Taiwan
| | - Hsien-Ming Lee
- Institute of Chemistry, Academia Sinica, Taipei, 11529, Taiwan
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Lin CY, Wang YL, Chen YJ, Ho CT, Chi YH, Chan LY, Chen GW, Hsu HC, Hwang DW, Wu HC, Hung SC. Collagen-binding peptides for the enhanced imaging, lubrication and regeneration of osteoarthritic articular cartilage. Nat Biomed Eng 2022; 6:1105-1117. [PMID: 36229661 DOI: 10.1038/s41551-022-00948-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Accepted: 09/02/2022] [Indexed: 01/15/2023]
Abstract
Treatments for osteoarthritis would benefit from the enhanced visualization of injured articular cartilage and from the targeted delivery of disease-modifying drugs to it. Here, by using ex vivo human osteoarthritic cartilage and live rats and minipigs with induced osteoarthritis, we report the application of collagen-binding peptides, identified via phage display, that are home to osteoarthritic cartilage and that can be detected via magnetic resonance imaging when conjugated with a superparamagnetic iron oxide. Compared with the use of peptides with a scrambled sequence, hyaluronic acid conjugated with the collagen-binding peptides displayed enhanced retention in osteoarthritic cartilage and better lubricated human osteoarthritic tissue ex vivo. Mesenchymal stromal cells encapsulated in the modified hyaluronic acid and injected intra-articularly in rats showed enhanced homing to osteoarthritic tissue and improved its regeneration. Molecular docking revealed WXPXW as the consensus motif that binds to the α1 chain of collagen type XII. Peptides that specifically bind to osteoarthritic tissue may aid the diagnosis and treatment of osteoarthritic joints.
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Affiliation(s)
- Chin-Yu Lin
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Yung-Li Wang
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Yu-Jen Chen
- Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| | - Chun-Te Ho
- Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan
| | - Yi-Hsuan Chi
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan
| | - Long Yi Chan
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan
| | - Guan-Wen Chen
- Molecular Science Center, GGA Corporation, Taipei, Taiwan
| | - Horng-Chaung Hsu
- Department of Medicine, School of Medicine, China Medical University, Taichung, Taiwan.,Department of Orthopaedics, China Medical University Hospital, Taichung, Taiwan
| | - Dennis W Hwang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Han-Chung Wu
- Institute of Cellular and Organismic Biology, Academia Sinica, Taipei, Taiwan.
| | - Shih-Chieh Hung
- Drug Development Center, Institute of Translational Medicine and New Drug Development, School of Medicine, China Medical University, Taichung, Taiwan. .,Integrative Stem Cell Center, China Medical University Hospital, Taichung, Taiwan. .,Department of Orthopaedics, China Medical University Hospital, Taichung, Taiwan.
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3
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Huang GS, Peng YJ, Hwang DW, Lee HS, Chang YC, Chiang SW, Hsu YC, Liu YC, Lin MH, Wang CY. Assessment of the efficacy of intra-articular platelet rich plasma treatment in an ACLT experimental model by dynamic contrast enhancement MRI of knee subchondral bone marrow and MRI T2 ∗ measurement of articular cartilage. Osteoarthritis Cartilage 2021; 29:718-727. [PMID: 33577958 DOI: 10.1016/j.joca.2021.02.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 01/03/2021] [Accepted: 02/02/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVE The vascularization of subchondral bone plays a significant role in the progression of knee osteoarthritis (OA). Treatment with platelet-rich plasma (PRP) has positive effects on cartilage lesions. However, PRP's efficacy for subchondral bone marrow lesions and the relationship of these lesions to cartilage are still undiscovered. Therefore, our aims were first to longitudinally investigate the change in subchondral flow by dynamic contrast enhanced MRI and degeneration of cartilage by MRI T2∗ in an anterior cruciate transection rodent (ACLT) model, and second to examine changes in parameters after intra-articular PRP injection. DESIGN A 32-week investigation in 18 rats allocated to sham-control, ACLT with normal saline injection (ACLT + NS), and ACLT with PRP injection groups ended with histological evaluation. Another rat was used as a donor of allogenic PRP. RESULTS Compared to the sham-control group, the ACLT + NS group had higher subchondral blood volume A (0.051, 95% confidence interval: 0.009, 0.092) and lower venous washout kel (-0.030: -0.055, -0.005) from week 4; lower permeability kep from week 18 (-0.954: -1.339, -0.569); higher cartilage T2∗ values (1.803: 1.504, 2.102) reflecting collagen loss beginning at week 10. For the PRP treatment group, subchondral bone marrow A and cartilage T2∗ decreased from week 10. Histological results confirmed and were correlated with the MRI findings. CONCLUSION Subchondral hyper-perfusion plays a vital role in the pathogenesis of OA and was associated with cartilage degeneration. The efficacy of PRP can be observed from reduced perfusion and MRI T2∗ values.
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Affiliation(s)
- G-S Huang
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Department of Medical Research, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Y-J Peng
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - D W Hwang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - H-S Lee
- Department of Pathology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan; Department of Pathology and Laboratory Medicine, Kaohsiung Veterans General Hospital, Kaohsiung, Taiwan
| | - Y-C Chang
- Department of Mathematics, Tamkang University, New Taipei, Taiwan
| | - S-W Chiang
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Y-C Hsu
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - Y-C Liu
- Department of Radiology, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan
| | - M-H Lin
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - C-Y Wang
- Department and Graduate Institute of Biology and Anatomy, National Defense Medical Center, Taipei, Taiwan.
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Svyatova A, Kozinenko VP, Chukanov NV, Burueva DB, Chekmenev EY, Chen YW, Hwang DW, Kovtunov KV, Koptyug IV. PHIP hyperpolarized [1- 13C]pyruvate and [1- 13C]acetate esters via PH-INEPT polarization transfer monitored by 13C NMR and MRI. Sci Rep 2021; 11:5646. [PMID: 33707497 PMCID: PMC7952547 DOI: 10.1038/s41598-021-85136-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Accepted: 02/18/2021] [Indexed: 01/31/2023] Open
Abstract
Parahydrogen-induced polarization of 13C nuclei by side-arm hydrogenation (PHIP-SAH) for [1-13C]acetate and [1-13C]pyruvate esters with application of PH-INEPT-type pulse sequences for 1H to 13C polarization transfer is reported, and its efficiency is compared with that of polarization transfer based on magnetic field cycling (MFC). The pulse-sequence transfer approach may have its merits in some applications because the entire hyperpolarization procedure is implemented directly in an NMR or MRI instrument, whereas MFC requires a controlled field variation at low magnetic fields. Optimization of the PH-INEPT-type transfer sequences resulted in 13C polarization values of 0.66 ± 0.04% and 0.19 ± 0.02% for allyl [1-13C]pyruvate and ethyl [1-13C]acetate, respectively, which is lower than the corresponding polarization levels obtained with MFC for 1H to 13C polarization transfer (3.95 ± 0.05% and 0.65 ± 0.05% for allyl [1-13C]pyruvate and ethyl [1-13C]acetate, respectively). Nevertheless, a significant 13C NMR signal enhancement with respect to thermal polarization allowed us to perform 13C MR imaging of both biologically relevant hyperpolarized molecules which can be used to produce useful contrast agents for the in vivo imaging applications.
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Affiliation(s)
- Alexandra Svyatova
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090 ,grid.4605.70000000121896553Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090 ,grid.418953.2Institute of Cytology and Genetics SB RAS, 10 Ac. Lavrentieva Ave., Novosibirsk, Russia 630090
| | - Vitaly P. Kozinenko
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090 ,grid.4605.70000000121896553Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090
| | - Nikita V. Chukanov
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090 ,grid.4605.70000000121896553Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090
| | - Dudari B. Burueva
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090 ,grid.4605.70000000121896553Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090
| | - Eduard Y. Chekmenev
- grid.254444.70000 0001 1456 7807Department of Chemistry, Wayne State University, Detroit, MI 48201 USA ,grid.254444.70000 0001 1456 7807Karmanos Cancer Institute, Wayne State University, Detroit, MI 48201 USA ,grid.254444.70000 0001 1456 7807Integrative Biosciences, Wayne State University, Detroit, MI 48201 USA ,grid.4886.20000 0001 2192 9124Russian Academy of Sciences, Moscow, Russia 119991
| | - Yu-Wen Chen
- grid.28665.3f0000 0001 2287 1366Institute of Biomedical Sciences, Academia Sinica, Taipei, 115 Taiwan (Republic of China)
| | - Dennis W. Hwang
- grid.28665.3f0000 0001 2287 1366Institute of Biomedical Sciences, Academia Sinica, Taipei, 115 Taiwan (Republic of China)
| | - Kirill V. Kovtunov
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090 ,grid.4605.70000000121896553Novosibirsk State University, 2 Pirogova St., Novosibirsk, Russia 630090
| | - Igor V. Koptyug
- grid.419389.e0000 0001 2163 7228International Tomography Center SB RAS, 3A Institutskaya St., Novosibirsk, Russia 630090
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Yu K, Yu Y, Yao Y, Wu Z, Fu S, Cheng RH, Chen YW, Chen HY, Zhou J, Hwang DW, Ding S. A Polypeptide-Based, Membrane-Penetrating, Target-Specific Contrast Agent for Magnetic Resonance Molecular Imaging. ACS Appl Bio Mater 2021; 4:1597-1604. [DOI: 10.1021/acsabm.0c01442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kaichao Yu
- Department of Chemistry and Centre for Nanoscience and Nanotechnology, National Sun Yat-sen University, 70 Lien-Hai Road, Kaohsiung 80424, Taiwan
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yamian Yu
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yao Yao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zhen Wu
- Department of Chemistry and Centre for Nanoscience and Nanotechnology, National Sun Yat-sen University, 70 Lien-Hai Road, Kaohsiung 80424, Taiwan
| | - Shitao Fu
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Ren-Hao Cheng
- Department of Chemistry and Centre for Nanoscience and Nanotechnology, National Sun Yat-sen University, 70 Lien-Hai Road, Kaohsiung 80424, Taiwan
| | - Yu-Wen Chen
- Institute of Biomedical Sciences, Academia Sinica, 128 Sec. 2, Academia Rd. Nankang, Taipei 115, Taiwan
| | - Hsuan-Ying Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, 100, Shih-Chuan 1st Road, Kaohsiung 80708, Taiwan
| | - Jinlan Zhou
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Dennis W. Hwang
- Institute of Biomedical Sciences, Academia Sinica, 128 Sec. 2, Academia Rd. Nankang, Taipei 115, Taiwan
| | - Shangwu Ding
- Department of Chemistry and Centre for Nanoscience and Nanotechnology, National Sun Yat-sen University, 70 Lien-Hai Road, Kaohsiung 80424, Taiwan
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Chen YW, Liu HQ, Wu QX, Huang YH, Tung YY, Lin MH, Lin CH, Chen TC, Lin EC, Hwang DW. pH Mapping of Skeletal Muscle by Chemical Exchange Saturation Transfer (CEST) Imaging. Cells 2020; 9:E2610. [PMID: 33291803 PMCID: PMC7762073 DOI: 10.3390/cells9122610] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/13/2020] [Accepted: 12/02/2020] [Indexed: 12/13/2022] Open
Abstract
Magnetic resonance imaging (MRI) is extensively used in clinical and basic biomedical research. However, MRI detection of pH changes still poses a technical challenge. Chemical exchange saturation transfer (CEST) imaging is a possible solution to this problem. Using saturation transfer, alterations in the exchange rates between the solute and water protons because of small pH changes can be detected with greater sensitivity. In this study, we examined a fatigued skeletal muscle model in electrically stimulated mice. The measured CEST signal ratio was between 1.96 ppm and 2.6 ppm in the z-spectrum, and this was associated with pH values based on the ratio between the creatine (Cr) and the phosphocreatine (PCr). The CEST results demonstrated a significant contrast change at the electrical stimulation site. Moreover, the pH value was observed to decrease from 7.23 to 7.15 within 20 h after electrical stimulation. This pH decrease was verified by 31P magnetic resonance spectroscopy and behavioral tests, which showed a consistent variation over time.
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Affiliation(s)
- Yu-Wen Chen
- Biomedical Translation Research Center, Academia Sinica, Taipei 115, Taiwan; (Y.-W.C.); (Y.-Y.T.); (M.-H.L.); (C.-H.L.)
| | - Hong-Qing Liu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan; (H.-Q.L.); (Q.-X.W.); (Y.-H.H.); (T.-C.C.)
| | - Qi-Xuan Wu
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan; (H.-Q.L.); (Q.-X.W.); (Y.-H.H.); (T.-C.C.)
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 621, Taiwan;
| | - Yu-Han Huang
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan; (H.-Q.L.); (Q.-X.W.); (Y.-H.H.); (T.-C.C.)
- The Department of Biotechnology, Ming Chuan University, Taoyuan 333, Taiwan
| | - Yu-Ying Tung
- Biomedical Translation Research Center, Academia Sinica, Taipei 115, Taiwan; (Y.-W.C.); (Y.-Y.T.); (M.-H.L.); (C.-H.L.)
| | - Ming-Huang Lin
- Biomedical Translation Research Center, Academia Sinica, Taipei 115, Taiwan; (Y.-W.C.); (Y.-Y.T.); (M.-H.L.); (C.-H.L.)
| | - Chia-Huei Lin
- Biomedical Translation Research Center, Academia Sinica, Taipei 115, Taiwan; (Y.-W.C.); (Y.-Y.T.); (M.-H.L.); (C.-H.L.)
| | - Tsai-Chen Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan; (H.-Q.L.); (Q.-X.W.); (Y.-H.H.); (T.-C.C.)
- The Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei 112, Taiwan
| | - Eugene C. Lin
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chiayi 621, Taiwan;
| | - Dennis W. Hwang
- Biomedical Translation Research Center, Academia Sinica, Taipei 115, Taiwan; (Y.-W.C.); (Y.-Y.T.); (M.-H.L.); (C.-H.L.)
- Institute of Biomedical Sciences, Academia Sinica, Taipei 115, Taiwan; (H.-Q.L.); (Q.-X.W.); (Y.-H.H.); (T.-C.C.)
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Lan YJ, Yeh PS, Kao TY, Lo YC, Sue SC, Chen YW, Hwang DW, Chiang YW. Anti-apoptotic BCL-2 regulation by changes in dynamics of its long unstructured loop. Commun Biol 2020; 3:668. [PMID: 33184407 PMCID: PMC7665024 DOI: 10.1038/s42003-020-01390-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 10/19/2020] [Indexed: 12/13/2022] Open
Abstract
BCL-2, a key protein in inhibiting apoptosis, has a 65-residue-long highly flexible loop domain (FLD) located on the opposite side of its ligand-binding groove. In vivo phosphorylation of the FLD enhances the affinity of BCL-2 for pro-apoptotic ligands, and consequently anti-apoptotic activity. However, it remains unknown as to how the faraway, unstructured FLD modulates the affinity. Here we investigate the protein-ligand interactions by fluorescence techniques and monitor protein dynamics by DEER and NMR spectroscopy tools. We show that phosphomimetic mutations on the FLD lead to a reduction in structural flexibility, hence promoting ligand access to the groove. The bound pro-apoptotic ligands can be displaced by the BCL-2-selective inhibitor ABT-199 efficiently, and thus released to trigger apoptosis. We show that changes in structural flexibility on an unstructured loop can activate an allosteric protein that is otherwise structurally inactive.
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Affiliation(s)
- Yu-Jing Lan
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
| | - Pei-Shan Yeh
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
| | - Te-Yu Kao
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
| | - Yuan-Chao Lo
- Biomedical Translation Research Center, Academia Sinica, Taipei, Taiwan
| | - Shih-Che Sue
- Institute of Bioinformatics and Structural Biology, National Tsing Hua University, Hsinchu, Taiwan
| | - Yu-Wen Chen
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan
| | - Dennis W Hwang
- Institute of Biomedical Sciences, Academia Sinica, Taipei, Taiwan.
| | - Yun-Wei Chiang
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan.
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8
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Kim YI, Song KB, Lee YJ, Park KM, Hwang DW, Lee JH, Shin SH, Kwon JW, Ro JS, Kim SC. Management of isolated recurrence after surgery for pancreatic adenocarcinoma. Br J Surg 2019; 106:898-909. [PMID: 31162655 DOI: 10.1002/bjs.11144] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 07/10/2018] [Accepted: 01/25/2019] [Indexed: 12/31/2022]
Abstract
BACKGROUND Recurrence of pancreatic cancer after primary pancreatectomy occurs in the vast majority of patients. The role of surgical treatment for recurrent pancreatic cancer is not well established. METHODS Patients who underwent primary pancreatectomy with curative intent from 2000 to 2014 at a single large-volume centre were evaluated retrospectively. CT or PET was used to select patients with an isolated recurrence. The clinicopathological features and survival outcomes were compared according to treatment modalities. RESULTS Of the 1610 patients with pancreatic cancer who underwent resection, 1346 (83·6 per cent) were diagnosed with recurrent pancreatic cancer. Recurrence was locoregional in 366 patients (27·2 per cent), distant multifocal in 251 (18·6 per cent), distant isolated in 188 (14·0 per cent), locoregional plus distant in 153 (11·4 per cent) and peritoneal seeding in 388 (28·8 per cent). Of the 1346 patients with recurrence, 197 (14·6 per cent) had isolated recurrence; of these, 48 (24·4 per cent of all isolated recurrences; 3·6 per cent of all recurrences) underwent resection. Median survival of the 197 patients after diagnosis of isolated recurrence was 14·7 months; it was longer in patients who underwent surgical resection than among those treated non-surgically (23·5 versus 12·0 months; P = 0·014). Multivariable analysis showed that chemotherapy and resection for recurrence were associated with better prognosis. Median survival after recurrence was longest in the 23 patients with isolated pulmonary recurrence (33·3 months). Survival after recurrence was better in patients who underwent resection of isolated recurrence in the remnant pancreas (median 28·0 versus 12·0 months, P = 0·010) and lung (median 36·5 versus 9·5 months; P = 0·010) than in those who did not undergo resection. CONCLUSION Surgical resection may be considered an option for treatment of patients with isolated recurrent pancreatic cancer.
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Affiliation(s)
- Y I Kim
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - K B Song
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - Y-J Lee
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - K-M Park
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - D W Hwang
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - J H Lee
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - S H Shin
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - J W Kwon
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
| | - J-S Ro
- Clinical Preventive Medicine Centre, Seoul National University Bundang Hospital, Bundang-gu, South Korea
| | - S C Kim
- Division of Hepatobiliary and Pancreatic Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Centre, Seoul, South Korea
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9
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Yang Y, Chen S, Li H, Yuan Y, Zhang Z, Xie J, Hwang DW, Zhang A, Liu M, Zhou X. Engineered Paramagnetic Graphene Quantum Dots with Enhanced Relaxivity for Tumor Imaging. Nano Lett 2019; 19:441-448. [PMID: 30560672 DOI: 10.1021/acs.nanolett.8b04252] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nano contrast agents (Nano CA) are nanomaterials used to increase contrast in the medical magnetic resonance imaging (MRI). However, the related relaxation mechanism of the Nano CA is not clear yet and little significant breakthrough in relaxivity enhancement has been achieved. Herein, a new hydrophilic Gd-DOTA complex functionalized with different chain length of PEG was synthesized and incorporated into graphene quantum dots (GQD) to obtain paramagnetic graphene quantum dots (PGQD). We performed a variable-temperature and variable-field intensity NMR study in aqueous solution on the water exchange and rotational dynamics of three different chain lengths of PGQD. The optimal GQD with paramagnetic chain length shows a great improvement in performance on 1H NMR relaxometric studies. In vitro results demonstrated that the relaxivity of the designed PGQD could be controlled by regulating the PEG length, and its relaxivity was ∼16 times higher than that of current commercial MRI contrast agents (e.g., Gd-DTPA), on a "per Gd" basis. The relaxivity of the Nano CA can be rationally tuned to obtain unmatched potentials in MR imaging, exemplified by preparation of the paramagnetic GQD with the enhanced T1 relaxivity. The fabricated PGQDs with suitable PEG length got the best relaxivity at 1.5 T. After intravenous injection, its feeding process by solid tumor could even be monitored by clinically used 1.5 T MRI scanners. This research will also provide an excellent platform for the design and synthesis of highly effective MR contrast agents.
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Affiliation(s)
- Yuqi Yang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Shizhen Chen
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Haidong Li
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Yaping Yuan
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Zhiying Zhang
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Junshuai Xie
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Dennis W Hwang
- Department of Chemistry and Biochemistry , National Chung-Cheng University , 168 University Road , Min-Hsiung, Chiayi 621 , Taiwan
| | - Aidong Zhang
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry , Central China Normal University , Wuhan 430079 , P.R. China
| | - Maili Liu
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
| | - Xin Zhou
- State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics , Chinese Academy of Sciences , Wuhan , 430071 , P.R. China
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10
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Cheng RH, Chen JM, Chen YW, Cai H, Cui X, Hwang DW, Chen Z, Ding S. Cover Feature: Macromolecular Crowding May Significantly Affect the Performance of an MRI Contrast Agent: A 1
H NMR Spectroscopy, Microimaging, and Fast-Field-Cycling NMR Relaxometry Study (ChemistryOpen 4/2018). ChemistryOpen 2018. [PMCID: PMC5891658 DOI: 10.1002/open.201800033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Ren-Hao Cheng
- Department of Chemistry and Center for Nanoscience & Nanotechnology; National Sun Yat-sen University; 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China), Fax: (886)-7-525-3909
| | - Jie-Min Chen
- Department of Chemistry and Center for Nanoscience & Nanotechnology; National Sun Yat-sen University; 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China), Fax: (886)-7-525-3909
| | - Yu-Wen Chen
- Institute of Biomedical Sciences; Academia Sinica; Taipei (Taiwan) 115 Republic of China
| | - Honghao Cai
- Department of Chemistry and Center for Nanoscience & Nanotechnology; National Sun Yat-sen University; 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China), Fax: (886)-7-525-3909
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces; Xiamen University; 422 Siming South Road Xiamen 361005 P.R. China
- School of Science; Jimei University; 183 Yinjiang Road Xiamen 361021 P.R. China
| | - Xiaohong Cui
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces; Xiamen University; 422 Siming South Road Xiamen 361005 P.R. China
| | - Dennis W. Hwang
- Institute of Biomedical Sciences; Academia Sinica; Taipei (Taiwan) 115 Republic of China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces; Xiamen University; 422 Siming South Road Xiamen 361005 P.R. China
| | - Shangwu Ding
- Department of Chemistry and Center for Nanoscience & Nanotechnology; National Sun Yat-sen University; 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China), Fax: (886)-7-525-3909
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11
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Cheng RH, Chen JM, Chen YW, Cai H, Cui X, Hwang DW, Chen Z, Ding S. Macromolecular Crowding May Significantly Affect the Performance of an MRI Contrast Agent: A 1H NMR Spectroscopy, Microimaging, and Fast-Field-Cycling NMR Relaxometry Study. ChemistryOpen 2018; 7:288-296. [PMID: 29657915 PMCID: PMC5891664 DOI: 10.1002/open.201700192] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Indexed: 11/09/2022] Open
Abstract
Contrast enhancement agents are often employed in magnetic resonance imaging (MRI) for clinical diagnosis and biomedical research. However, the current theory on MRI contrast generation does not consider the ubiquitous presence of macromolecular crowders in biological systems, which poses the risk of inaccurate data interpretation and misdiagnosis. To address this issue, herein the macromolecular crowding effects on MRI contrast agent are investigated with the 1H relaxation rate of water in aqueous solutions of Dotarem with different concentrations of macromolecules. Two representative macromolecular crowder systems are used: polyethylene glycol (with no specific secondary structure) and bovine serum albumin (with compact secondary and tertiary structures). The water 1H relaxation rates in various solutions are measured in a fixed magnetic field and in variable magnetic fields. The results show significant crowding effects for both crowders. The relaxation rate is proportional to the concentration of the MRI contrast agent but shows conspicuous superlinearity with respect to the concentration of the crowder. The size of polyethylene glycol does not affect the relaxivity of water in Dotarem solutions. The above effects are verified with T1- and T2-weighted NMR microimages. These results highlight the importance of the effect of macromolecular crowding on the MRI contrast agent and are valuable for understanding the mechanism of MRI contrast agents and designing new-generation MRI contrast agents.
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Affiliation(s)
- Ren-Hao Cheng
- Department of Chemistry and Center for Nanoscience & Nanotechnology National Sun Yat-sen University 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China)
| | - Jie-Min Chen
- Department of Chemistry and Center for Nanoscience & Nanotechnology National Sun Yat-sen University 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China)
| | - Yu-Wen Chen
- Institute of Biomedical Sciences Academia Sinica Taipei (Taiwan) 115 Republic of China
| | - Honghao Cai
- Department of Chemistry and Center for Nanoscience & Nanotechnology National Sun Yat-sen University 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China).,Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University 422 Siming South Road Xiamen 361005 P.R. China.,School of Science Jimei University 183 Yinjiang Road Xiamen 361021 P.R. China
| | - Xiaohong Cui
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University 422 Siming South Road Xiamen 361005 P.R. China
| | - Dennis W Hwang
- Institute of Biomedical Sciences Academia Sinica Taipei (Taiwan) 115 Republic of China
| | - Zhong Chen
- Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, State Key Laboratory of Physical Chemistry of Solid Surfaces Xiamen University 422 Siming South Road Xiamen 361005 P.R. China
| | - Shangwu Ding
- Department of Chemistry and Center for Nanoscience & Nanotechnology National Sun Yat-sen University 70 Lien-Hai Road, Kaohsiung Taiwan 80424 Republic of China)
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12
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Burueva D, Romanov AS, Salnikov OG, Zhivonitko VV, Chen YW, Barskiy DA, Chekmenev EY, Hwang DW, Kovtunov KV, Koptyug IV. Extending the Lifetime of Hyperpolarized Propane Gas through Reversible Dissolution. J Phys Chem C Nanomater Interfaces 2017; 121:4481-4487. [PMID: 28286597 PMCID: PMC5338591 DOI: 10.1021/acs.jpcc.7b00509] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Revised: 02/06/2017] [Indexed: 05/22/2023]
Abstract
Hyperpolarized (HP) propane produced by the parahydrogen-induced polarization (PHIP) technique has been recently introduced as a promising contrast agent for functional lung magnetic resonance (MR) imaging. However, its short lifetime due to a spin-lattice relaxation time T1 of less than 1 s in the gas phase is a significant translational challenge for its potential biomedical applications. The previously demonstrated approach for extending the lifetime of the HP propane state through long-lived spin states allows the HP propane lifetime to be increased by a factor of ∼3. Here, we demonstrate that a remarkable increase in the propane hyperpolarization decay time at high magnetic field (7.1 T) can be achieved by its dissolution in deuterated organic solvents (acetone-d6 or methanol-d4). The approximate values of the HP decay time for propane dissolved in acetone-d6 are 35.1 and 28.6 s for the CH2 group and the CH3 group, respectively (similar values were obtained for propane dissolved in methanol-d4), which are ∼50 times larger than the gaseous propane T1 value. Furthermore, we show that it is possible to retrieve HP propane from solution to the gas phase with the preservation of hyperpolarization.
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Affiliation(s)
- Dudari
B. Burueva
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
| | - Alexey S. Romanov
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
| | - Oleg G. Salnikov
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
| | - Vladimir V. Zhivonitko
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
| | - Yu-Wen Chen
- Department
of Chemistry and Biochemistry, National
Chung Cheng University, 168 University Road, Min-Hsiung, Chiayi 62102, Taiwan
| | - Danila A. Barskiy
- Department
of Radiology, Vanderbilt University Institute
of Imaging Science (VUIIS), 1161 21st Avenue South, Medical
Center North, AA-1105, Nashville, Tennessee 37232-2310, United States
- Department of Biomedical Engineering and Physics, Vanderbilt-Ingram Cancer Center (VICC), 1301 Medical Center Drive, Nashville, Tennessee 37232-2310, United States
| | - Eduard Y. Chekmenev
- Department
of Radiology, Vanderbilt University Institute
of Imaging Science (VUIIS), 1161 21st Avenue South, Medical
Center North, AA-1105, Nashville, Tennessee 37232-2310, United States
- Department of Biomedical Engineering and Physics, Vanderbilt-Ingram Cancer Center (VICC), 1301 Medical Center Drive, Nashville, Tennessee 37232-2310, United States
- Russian
Academy of Sciences, 14 Leninskiy Prospekt, 119991 Moscow, Russia
| | - Dennis W. Hwang
- Department
of Chemistry and Biochemistry, National
Chung Cheng University, 168 University Road, Min-Hsiung, Chiayi 62102, Taiwan
| | - Kirill V. Kovtunov
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
- E-mail:
| | - Igor V. Koptyug
- International
Tomography Center SB RAS, 3A Institutskaya Street, 630090 Novosibirsk, Russia
- Novosibirsk
State University, 2 Pirogova
Street, 630090 Novosibirsk, Russia
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13
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Lu CC, Shen CH, Chang CB, Hsieh HY, Wu JD, Tseng LH, Hwang DW, Chen SY, Wu SF, Chan MWY, Hsu CD. Guizhi Fuling Wan as a Novel Agent for Intravesical Treatment for Bladder Cancer in a Mouse Model. Mol Med 2016; 22:64-73. [PMID: 26837068 DOI: 10.2119/molmed.2015.00085] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2015] [Accepted: 01/13/2016] [Indexed: 02/04/2023] Open
Abstract
Alternative intravesical agents are required to overcome the side effects currently associated with the treatment of bladder cancer. This study used an orthotopic bladder cancer mouse model to evaluate Guizhi Fuling Wan (GFW) as an intravesical agent. The effects of GFW were compared with those of mitomycin-C (Mito-C) and bacille Calmette-Guérin (BCG). We began by evaluating the response of the mouse bladder cancer cell line MB49 to GFW treatment, with regard to cell viability, cell cycle progression and apoptosis. MB49 cells were subsequently implanted into the urothelial walls of the bladder in female C57BL/6 mice. The success of the model was confirmed by the appearance of hematuria and tumor growth in the bladder. Intravesical chemotherapy was administered in accordance with a published protocol. In vitro data revealed that GFW arrested MB49 cell cycle in the G0/G1 phase, resulting in the suppression of cell proliferation and induced apoptosis. One possible mechanism underlying these effects is an increase in intracellular reactive oxygen species (ROS) levels leading to the activation of ataxia telangiectasia-mutated (ATM)/checkpoint kinase 2 (CHK2) and ATM/P53 pathways, thereby mediating cell cycle progression and apoptosis, respectively. This mouse model demonstrates the effectiveness of GFW in the tumor growth, with results comparable to those achieved by using BCG and Mito-C. Furthermore, GFW was shown to cause only mild hematuria. The low toxicity of the compound was confirmed by a complete lack of lesions on bladder tissue, even after 10 consecutive treatments using high concentrations of GFW. These results demonstrate the potential of GFW for the intravesical therapy of bladder cancer.
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Affiliation(s)
- Chi-Chen Lu
- Department of Chinese Medicine, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan.,Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan
| | - Cheng-Huang Shen
- Department of Medical Research, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan.,Department of Urology, and Pathology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
| | - Chia-Bin Chang
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan
| | - Hsiao-Yen Hsieh
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Medical Research, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
| | - Jiann-Der Wu
- Department of Pathology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
| | - Ling-Huei Tseng
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan
| | - Dennis W Hwang
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, Taiwan
| | - Syue-Yi Chen
- Department of Medical Research, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
| | - Shu-Fen Wu
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan
| | - Michael W Y Chan
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Life Science, National Chung Cheng University, Chia-Yi, Taiwan
| | - Cheng-Da Hsu
- Graduate Institute of Molecular Biology, National Chung Cheng University, Chia-Yi, Taiwan.,Department of Medical Research, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan.,Department of Urology, and Pathology, Ditmanson Medical Foundation Chia-Yi Christian Hospital, Chia-Yi, Taiwan
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14
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Chen YW, Hwang DW. Multi-chromatic magnetic resonance imaging using frequency lock-in suppression. NMR Biomed 2015; 28:1187-1195. [PMID: 26282163 DOI: 10.1002/nbm.3361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 06/02/2015] [Accepted: 06/15/2015] [Indexed: 06/04/2023]
Abstract
This study developed a multi-chromatic MR contrast using the frequency lock-in technique. An electronic feedback device that generates a specific narrow-frequency-bandwidth RF field is presented. The effects of this RF field on MR images are assessed both theoretically and experimentally. Spectroscopy and imaging experiments were performed. Frequency tuning allowed the selected spectral peak to be suppressed. Phantom tests using methanol, ethanol, and water showed different contrasts using different feedback RF field frequencies. The frequency lock-in was also found to help differentiate among the small structural variations in biological tissues. The contrast achieved in in vivo mouse brain imaging using the lock-in suppressed technique indicated a better spatial discrimination when compared with that achieved using conventional imaging methods, especially in the hippocampus region. Selective lock-in suppressed imaging is a new approach to provide frequency information in MRI; rather than determining the evolution of image contrast over time, this approach allows small susceptibility variations to be distinguished by tuning the frequency of the narrow-bandwidth lock-in RF field. A new and enhanced contrast can be achieved using this technique.
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Affiliation(s)
- Yu-Wen Chen
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min-Hsiung Township, Chiayi, Taiwan
| | - Dennis W Hwang
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min-Hsiung Township, Chiayi, Taiwan
- Center for Nano Bio-detection, AIM-HI, National Chung Cheng University, Min-Hsiung Township, Chiayi, Taiwan
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15
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Gupta A, Willis SA, Waddington LJ, Stait‐Gardner T, de Campo L, Hwang DW, Kirby N, Price WS, Moghaddam MJ. Frontispiece: Gd‐DTPA‐Dopamine‐Bisphytanyl Amphiphile: Synthesis, Characterisation and Relaxation Parameters of the Nanoassemblies and Their Potential as MRI Contrast Agents. Chemistry 2015. [DOI: 10.1002/chem.201584062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Abhishek Gupta
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Scott A. Willis
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Lynne J. Waddington
- Manufacturing Flagship CSIRO, 343 Royal Parade, Parkville, VIC, 3052 (Australia)
| | - Tim Stait‐Gardner
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Liliana de Campo
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
- Bragg Institute ANSTO, Lucas Heights, NSW, 2234 (Australia)
| | - Dennis W. Hwang
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min‐Hsiung Township Chiayi, 621 (Taiwan)
| | - Nigel Kirby
- Australian Synchrotron, 800 Blackburn Road, Clayton, VIC, 3168 (Australia)
| | - William S. Price
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Minoo J. Moghaddam
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
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16
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Gupta A, Willis SA, Waddington LJ, Stait‐Gardner T, de Campo L, Hwang DW, Kirby N, Price WS, Moghaddam MJ. Gd‐DTPA‐Dopamine‐Bisphytanyl Amphiphile: Synthesis, Characterisation and Relaxation Parameters of the Nanoassemblies and Their Potential as MRI Contrast Agents. Chemistry 2015; 21:13950-60. [DOI: 10.1002/chem.201501905] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Indexed: 12/25/2022]
Affiliation(s)
- Abhishek Gupta
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Scott A. Willis
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Lynne J. Waddington
- Manufacturing Flagship CSIRO, 343 Royal Parade, Parkville, VIC, 3052 (Australia)
| | - Tim Stait‐Gardner
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Liliana de Campo
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
- Bragg Institute ANSTO, Lucas Heights, NSW, 2234 (Australia)
| | - Dennis W. Hwang
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min‐Hsiung Township Chiayi, 621 (Taiwan)
| | - Nigel Kirby
- Australian Synchrotron, 800 Blackburn Road, Clayton, VIC, 3168 (Australia)
| | - William S. Price
- Nanoscale Organisation and Dynamics Group, University of Western Sydney, Penrith, NSW, 2751 (Australia)
| | - Minoo J. Moghaddam
- Manufacturing Flagship CSIRO, P.O. Box 52, North Ryde, NSW, 1670 (Australia)
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17
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Li Z, Hsu CH, Dimitrov N, Hwang DW, Chang HW, Hwang LP, Lin YY. Sensitive imaging of magnetic nanoparticles for cancer detection by active feedback MR. Magn Reson Med 2015. [DOI: 10.1002/mrm.25832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhao Li
- Department of Chemistry and Biochemistry; University of California; Los Angeles California USA
| | - Chao-Hsiung Hsu
- Department of Chemistry; National Tsing-Hua University; Hsinchu Taiwan
- Molecular Science and Technology Program; Taiwan International Graduate Program; Academia Sinica Taipei Taiwan
| | - Nikolay Dimitrov
- Department of Chemistry and Biochemistry; University of California; Los Angeles California USA
| | - Dennis W. Hwang
- Department of Chemistry and Biochemistry; University of California; Los Angeles California USA
| | - Hsin-Wei Chang
- Department of Chemistry; National Taiwan University; Taipei Taiwan
| | - Lian-Pin Hwang
- Department of Chemistry; National Taiwan University; Taipei Taiwan
| | - Yung-Ya Lin
- Department of Chemistry and Biochemistry; University of California; Los Angeles California USA
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18
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Li Z, Hsu CH, Dimitrov N, Hwang DW, Chang HW, Hwang LP, Lin YY. Sensitive imaging of magnetic nanoparticles for cancer detection by active feedback MR. Magn Reson Med 2015; 74:33-41. [PMID: 25845581 DOI: 10.1002/mrm.25632] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 12/31/2014] [Accepted: 01/03/2015] [Indexed: 12/23/2022]
Abstract
PURPOSE Sensitive imaging of superparamagnetic nanoparticles or aggregates is of great importance in MR molecular imaging and medical diagnosis. For this purpose, a conceptually new approach, termed active feedback magnetic resonance, was developed. METHODS In the presence of the Zeeman field, a dipolar field is induced by the superparamagnetic nanoparticles or aggregates. Such dipolar field creates spatial and temporal (due to water diffusion) variations to the precession frequency of the nearby water 1 H magnetization. Sensitive imaging of magnetic nanoparticles or aggregates can be achieved by manipulating the intrinsic spin dynamics by selective self-excitation and fixed-point dynamics under active feedback fields. RESULTS Phantom experiments of superparamagnetic nanoparticles; in vitro experiments of brain tissue with blood clots; and in vivo mouse images of colon cancers, with and without labeling by magnetic nanoparticles, suggest that this new approach provides enhanced, robust, and positive contrast in imaging magnetic nanoparticles or aggregates for cancer detection. CONCLUSION The spin dynamics originated from selective self-excitation and fixed-point dynamics under active feedback fields have been shown to be sensitive to dipolar fields generated by magnetic nanoparticles. Magn Reson Med 74:33-41, 2015. © 2014 Wiley Periodicals, Inc.
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Affiliation(s)
- Zhao Li
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, USA
| | - Chao-Hsiung Hsu
- Department of Chemistry, National Tsing-Hua University, Hsinchu, Taiwan.,Molecular Science and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei, Taiwan
| | - Nikolay Dimitrov
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, USA
| | - Dennis W Hwang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, USA
| | - Hsin-Wei Chang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Lian-Pin Hwang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
| | - Yung-Ya Lin
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California, USA
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19
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Chen YW, Hsu CH, Hwang DW. Erratum to novel MRI contrast development by lock-in suppression (Magn Reson Med 2014;71:1676-1681). Magn Reson Med 2014. [DOI: 10.1002/mrm.25409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yu-Wen Chen
- Department of Chemistry and Biochemistry; National Chung Cheng University, Min-Hsiung Township Chiayi; Taiwan
| | - Chao-Hsiung Hsu
- Molecular Science and Technology Program; Taiwan International Graduate Program, Institute of Atomic and Molecular Sciences, Academia Sinica; Taipei Taiwan
- Department of Chemistry; National Tsing-Hua University; Hsinchu Taiwan
| | - Dennis W. Hwang
- Department of Chemistry and Biochemistry; National Chung Cheng University, Min-Hsiung Township Chiayi; Taiwan
- Center for Nano Bio-detection, AIM-HI; National Chung Cheng University, Min-Hsiung Township Chiayi; Taiwan
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20
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Chen YW, Hsu CH, Hsu CH, Hwang DW. Novel MRI contrast development by lock-in suppression. Magn Reson Med 2014; 71:1676-81. [PMID: 24604473 DOI: 10.1002/mrm.25162] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2013] [Revised: 01/12/2014] [Accepted: 01/14/2014] [Indexed: 11/06/2022]
Abstract
PURPOSE The goal of this study is to develop novel MR contrast by frequency lock-in technique. METHODS An electronic feedback device that can control the frequency and bandwidth of the feedback RF field is presented. In this study, the effects of lock-in suppressed imaging are discussed both theoretically and experimentally. RESULTS Two important imaging experiments were performed. The first experiment used magnetizations with the same central frequency but different frequency distributions and was compared with MR images obtained with T2 contrast agents. Lock-in suppressed images showed an improvement in contrast relative to the conventional imaging method. The second experiment used magnetizations with small shifts in frequency and a broad frequency distribution. This is helpful for differentiating between small structural variations in biological tissues. The contrast achieved in in vivo tumor imaging using the lock-in suppressed technique provide higher spatial resolutions and discriminate the regimes of necrosis and activation consistent with pathologic results. CONCLUSION Lock-in suppressed imaging introduces a conceptually new approach to MRI. Heightened sensitivity to underlying susceptibility variations and their relative contribution to total magnetization may thus be achieved to yield new and enhanced contrast.
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Affiliation(s)
- Yu-Wen Chen
- Department of Chemistry and Biochemistry, National Chung Cheng University, Min-Hsiung Township Chiayi, Taiwan
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Kamalakar G, Zhai QZ, Hwang DW, Chien SH, Yang YH, Lin JD, Chen YT, Hwang LP. Optical Properties of Host(SBA-15)-guest(AgI) Composite Materials. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200300008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Lin JJ, Harich S, Hwang DW, Wu MS, Lee YT, Yang X. Dynamics of Atomic and Molecular Hydrogen Elimination from Hydrocarbons at VUV Excitation. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.199900060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Hsieh CJ, Chen YW, Hwang DW. Effects of cholesterol on membrane molecular dynamics studied by fast field cycling NMR relaxometry. Phys Chem Chem Phys 2013; 15:16634-40. [PMID: 23965762 DOI: 10.1039/c3cp51739j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biological membranes are complex structures composed of various lipids and proteins. Different membrane compositions affect viscoelastic and hydrodynamic properties of membranes, which are critical to their functions. Lipid bilayer vesicles inserted by cholesterol not only enhance membrane surface motional behavior but also strengthen vesicle stability. Cholesterol-rich vesicles are similar to cell membranes in structure and composition. Therefore, cholesterol-rich vesicles can represent a typical model for studying membrane dynamics and functions. In this study, nuclear magnetic relaxation dispersion was used to investigate the detailed molecular dynamics of membrane differences between vesicles and cholesterol vesicles in the temperature range of 278-298 K. Vesicles of two different sizes were prepared. The effect of cholesterol mainly affected the order fluctuation of membranes and the diffusional motion of lipid molecules. In addition, phase variations were also observed in liposomes that contained cholesterol from analyses of the distances between lipid molecules.
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Affiliation(s)
- Chu-Jung Hsieh
- Department of Chemistry and Biochemistry, National Chung Cheng University, No. 168, Sec. 1, University Rd., Min-Hsiung Township Chiayi, 621, Taiwan.
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Jang J, Yoon K, Hwang DW, Lee DS, Kim S. A retroviral vector suitable for ultrasound image-guided gene delivery to mouse brain. Gene Ther 2011; 19:396-403. [DOI: 10.1038/gt.2011.120] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Chang WH, Chung CY, Chen JH, Hwang DW, Hsu CH, Yao C, Hwang LP. Simple mobile single-sided NMR apparatus with a relatively homogeneous B0 distribution. Magn Reson Imaging 2011; 29:869-76. [DOI: 10.1016/j.mri.2011.02.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2010] [Revised: 12/20/2010] [Accepted: 02/20/2011] [Indexed: 10/18/2022]
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Choi JM, Park KM, Kim SH, Hwang DW, Chon SH, Lee JH, Lee SY, Lee YJ. Effect of necrosis modulator necrox-7 on hepatic ischemia-reperfusion injury in beagle dogs. Transplant Proc 2011; 42:3414-21. [PMID: 21094788 DOI: 10.1016/j.transproceed.2010.08.050] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2010] [Revised: 07/29/2010] [Accepted: 08/26/2010] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The liver is susceptible to ischemia-reperfusion (IR) injury during inflow occlusion for hepatectomy. There is no effective pharmacologic agent available to prevent the release of high-mobility-group box 1 (HMGB1) or to ameliorate IR injury. This pilot study sought to develop a model in beagle dogs for the purpose of testing the efficacy of a necrosis modulator, necrox-7, to prevent hepatic IR injury in beagle dogs. METHODS Six male beagle dogs were randomly assigned to the control group (group A; n = 3) or the treatment group (group B; n = 3). Under general anesthesia, group B received intravenous infusion of necrox-7 (13 mg/kg over 20 minutes) followed by 60 minutes of left hepatic inflow occlusion and 60 minutes of reperfusion. Both groups were tested for serum biochemicals, hematology values, liver biopsies, and plasma HMGB1 levels over a 48-hour period. RESULTS The maximum alanine transferase (ALT), aspartate transferase (AST), and lactate dehydrogenase (LDH) levels among group A versus group B were: ALT 868.3 ± 337.4 IU/L vs 274.3 ± 72.6 IU/L (P = .041); AST 1,024.7 ± 246.5 IU/L vs 505.3 ± 66.7 IU/L (P = .024); and LDH 962.7 ± 226.2 IU/L vs 552.7 ± 62.4 IU/L (P = .039). Liver biopsy demonstrated marked necrosis and inflammatory infiltrates in group A, whereas group B showed little evidence of IR injury. The plasma HMGB1 concentration was significantly lower among group B versus A. CONCLUSION This pilot study developed a hepatic IR injury model, demonstrating that necrox-7 reduced hepatic necrosis secondary to IR injury in a large animal setting.
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Affiliation(s)
- J M Choi
- Division of Hepatobiliary and Pancreas Surgery, Department of Surgery, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea
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Yoon JS, Kim ES, Hwang DW, Choi JY, Kim BK, Park BB, Choi JH, Lee YY. Biologic characteristics of bone marrow-derived mesenchymal stem cells from a patient with thalassemia syndrome. Int J Lab Hematol 2010; 33:281-9. [PMID: 21199425 DOI: 10.1111/j.1751-553x.2010.01285.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
INTRODUCTION Mesenchymal stem cells (MSCs) are capable of self-renewal and differentiating morphologically and functionally into several mesenchymal tissues. There have been contrasting data on whether MSCs are altered in various hematologic disorders. METHODS We isolated bone marrow (BM)-derived MSCs from a patient with thalassemia syndrome to compare phenotypic and functional characteristics to those from normal healthy donor. RESULTS No differences were observed between MSCs from thalassemia syndrome (T-MSCs) and those from normal healthy donor in terms of morphology, phenotype, karyotype, multidifferentiation capacity. In mixed lymphocyte reaction, T-MSCs strongly inhibited the proliferation of allogeneic T cells in association with reduced proportion of CD3(+), CD4(+), and CD8(+) cells. Furthermore, the fraction of Treg cells was increased under the culture with T-MSCs, suggesting that T-MSCs exert normal immunomodulatory function. In addition, T-MSCs expressed hematopoietic cytokines and supported hematopoiesis, which was comparable to those from normal BM-derived MSCs. CONCLUSION T-MSCs exhibited normal phenotype, karyotype as well as normal immunomodulatory function, and autologous MSCs from patients with thalassemia syndrome may be an attractive source of stem cell in terms of hematopoietic support as well as immunomodulatory activity.
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Affiliation(s)
- J S Yoon
- Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
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Abstract
Double-quantum-filtered NMR and T(1) inversion-recovery spectroscopy were employed to exploit the temperature-dependent dynamics of D(2)O confined in MCM-41. Samples with three pore sizes of 1.58, 2.03, and 2.34 nm and two D(2)O contents were investigated. The reorientation correlation times of confined D(2)O in variously sized pores exhibit different temperature dependencies. The results reveal that the D(2)O molecules at fast motion site remain mobile below approximately 225 K and a liquid-liquid phase transition occurs around this temperature for all samples studied. This temperature is thought to be unreachable for supercooled D(2)O. Particularly, in 20 wt % D(2)O loaded samples with pore diameters of 1.58 and 2.03 nm, the reorientational correlation times of D(2)O at fast motion site exhibit Arrhenius behavior between 225 and 290 K, while other samples show power law dependency. Thus, a liquid phase of the fragile type in bigger pores changes to the strong type in samples with smaller pores.
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Affiliation(s)
- Dennis W Hwang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan 10617
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Hwang DW, Jhao WJ, Hwang LP. 2H T2rho relaxation dynamics and double-quantum filtered NMR studies. J Magn Reson 2005; 172:214-221. [PMID: 15649748 DOI: 10.1016/j.jmr.2004.10.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2004] [Revised: 10/15/2004] [Indexed: 05/24/2023]
Abstract
In this study 2H T2rho DQF NMR spectra of water in MCM-41 were measured. The T2rho double-quantum filtered (DQF) NMR signal is generated by applying a radio frequency (RF) field for various durations and then observed after a monitor RF pulse. It was found that the transfer between different quantum coherences by the couplings during long-duration RF fields (i.e., soft pulses) and that residual quadrupolar interaction dominates the signal decay. Knowledge of coherence transfer during long-RF pulses has special significance for the development of sophisticated multi-quantum NMR experiments especially multi-quantum MRI applications.
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Affiliation(s)
- Dennis W Hwang
- Department of Chemistry, National Taiwan University, Taipei, Taiwan, ROC.
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Zheng B, Hwang DW, Chen Z, Hwang LP. Rotating-frame intermolecular double-quantum spin-lattice relaxationT1?, DQC-weighted magnetic resonance imaging. Magn Reson Med 2005; 53:930-6. [PMID: 15799056 DOI: 10.1002/mrm.20432] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
In this study, spin-locking techniques were added as a part of intermolecular multiple-quantum experiments, thereby introducing the concept of rotating-frame intermolecular double-quantum spin-lattice relaxation, T(1rho, DQC). A novel magnetic resonance imaging methodology based on intermolecular multiple-quantum coherences is demonstrated on a 7.05-T microimaging scanner. The results clearly reveal that the intermolecular double-quantum coherence T(1rho, DQC)-weighted imaging technique provides an alternative contrast mechanism to conventional imaging.
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Affiliation(s)
- Bingwen Zheng
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Science, Academia Sinica, Taipei, Taiwan
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Chen Z, Chen ZW, Hwang DW, Zhong J, Hwang LP. Separation and characterization of different signals from intermolecular three-spin orders in solution NMR. J Magn Reson 2004; 171:244-252. [PMID: 15546750 DOI: 10.1016/j.jmr.2004.08.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2003] [Revised: 08/30/2004] [Indexed: 05/24/2023]
Abstract
In this paper, signals originating from a pure specific coherence of intermolecular three-spin orders were separated and characterized experimentally in highly polarized two-component spin systems. A modified CRAZED sequence with selective radio-frequency excitation was designed to separate the small signals from the strong conventional single-spin single-quantum signals. General theoretical expressions of the pulse sequence with arbitrary flip angle pulses were derived using dipolar field treatment. The expressions were used to predict the relaxation and diffusion properties and optimal experimental parameters such as flip angles. For the first time, relaxation and diffusion properties of pure intermolecular single-quantum, double-quantum, and triple-quantum coherences of three-spin orders were characterized and analyzed in one-dimensional experiments. All experimental observations are in excellent agreement with the theoretical predictions. The theoretical results show that the quantum-mechanical treatment leads to exactly the same predictions as the dipolar field treatment. The quantitative study of intermolecular multiple-quantum coherences of three-spin orders presented herein provides a better understanding of their mechanisms.
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Affiliation(s)
- Zhong Chen
- Departments of Physics and Chemistry, Xiamen University, and State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen, Fujian 361005, PR China.
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Hou T, Chen Z, Hwang DW, Zhong JH, Hwang LP. Intermolecular double-quantum coherence MR microimaging of pig tail with unique image contrast. Magn Reson Imaging 2004; 22:543-50. [PMID: 15120174 DOI: 10.1016/j.mri.2004.01.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2003] [Accepted: 01/28/2004] [Indexed: 11/24/2022]
Abstract
Image contrast in intermolecular double-quantum coherence (iDQC) imaging of a pig tail was investigated on a 7.05-T microimaging scanner. In addition to TR (repetition time) and TE (echo time), the time interval tau between radio frequency pulses during iDQC evolution and the areas under the iDQC-encode gradients in the iDQC imaging sequence were also used to manipulate image contrast. When suitable imaging parameters were selected, images with unique contrast, such as those with certain regions of the sample highlighted, were obtained without using contrast agents. The effects of iDQC-encode gradient on image contrast were studied quantitatively, and the unique contrast imposed by the related diffusion weighting was also shown. Experimental results demonstrated that the iDQC images have contrast fundamentally different from the conventional single-quantum coherence images.
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Affiliation(s)
- T Hou
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Science, Academia Sinica, No. 1, Sec. 4, Roosevelt Road, Taipei, Taiwan
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Chen Z, Hou T, Chen ZW, Hwang DW, Hwang LP. Selective intermolecular zero-quantum coherence in high-resolution NMR under inhomogeneous fields. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.01.055] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kamalakar G, W Hwang D, Hwang LP. Synthesis and characterization of multiwalled carbon nanotubes produced using zeolite Co-beta. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b110822k] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hwang DW, Sinha AK, Cheng CY, Yu TY, Hwang LP. Water Dynamics on the Surface of MCM-41 via 2H Double Quantum Filtered NMR and Relaxation Measurements. J Phys Chem B 2001. [DOI: 10.1021/jp002888j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dennis W. Hwang
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, R.O.C
| | - Anil K. Sinha
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, R.O.C
| | - Chi-Yuan Cheng
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, R.O.C
| | - Tsyr-Yan Yu
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, R.O.C
| | - Lian-Pin Hwang
- Department of Chemistry, National Taiwan University, and Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan, R.O.C
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Sinha AK, Hwang DW, Hwang LP. A novel approach to bulk synthesis of carbon nanotubes filled with metal by a catalytic chemical vapor deposition method. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01315-4] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Photodissociation of water at a wavelength of 121.6 nanometers has been investigated by using the H-atom Rydberg tagging technique. A striking even-odd intensity oscillation was observed in the OH(X) product rotational distribution. Model calculations attribute this oscillation to an unusual dynamical interference brought about by two dissociation pathways that pass through dissimilar conical intersections of potential energy surfaces, but result in the same products. The interference pattern and the OH product rotational distribution are sensitive to the positions and energies of the conical intersections, one with the atoms collinear as H-OH and the other as H-HO. An accurate simulation of the observations would provide a detailed test of global H(2)O potential energy surfaces for the three (&Xtilde;/A/&Btilde;) contributing states. The interference observed from the two conical intersection pathways provides a chemical analog of Young's well-known double-slit experiment.
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Affiliation(s)
- RN Dixon
- School of Chemistry, University of Bristol, Bristol BS8 1TS, UK. Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan 106, R.O.C
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Hwang DW, Yang X, Yang X. The vibrational distribution of the OH product from H2O photodissociation at 157 nm: Discrepancies between theory and experiment. J Chem Phys 1999. [DOI: 10.1063/1.478293] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lin JJ, Hwang DW, Lee YT, Yang X. Site and isotope effects on the molecular hydrogen elimination from ethylene at 157 nm excitation. J Chem Phys 1998. [DOI: 10.1063/1.476888] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lin JJ, Hwang DW, Lee YT, Yang X. Photodissociation of O2 at 157 nm: Experimental observation of anisotropy mixing in the O2+hν→O(3P)+O(3P) channel. J Chem Phys 1998. [DOI: 10.1063/1.476751] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Lin WY, Wang SJ, Hwang DW, Lan JL, Yeh SH. Technetium-99m-pyrophosphate scintigraphic findings of intestinal perforation in dermatomyositis. J Nucl Med 1995; 36:1615-7. [PMID: 7658221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Gastrointestinal complications are more common in children than in adults and present a serious problem with dermatomyositis. We report on a 66-yr-old man with dermatomyositis who suffered from intestinal perforation. The abdominal plain radiograph revealed only dilatation of the intestinal loops; increased radioactivity, however, was clearly demonstrated in the early 5-min and delayed 3-hr 99mTc-pyrophosphate images.
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Affiliation(s)
- W Y Lin
- Department of Nuclear Medicine, Taichung Veterans General Hospital, Taiwan, Republic of China
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Kang J, Sohn JG, Hong JH, Hwang DW, Jeong JI, Benning PJ, Olson CG, Min BI. Photoemission study of valence electrons in La(Co1-xFex)13 (x=0,0.2). Phys Rev B Condens Matter 1995; 52:4360-4365. [PMID: 9981567 DOI: 10.1103/physrevb.52.4360] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Kang J, Hwang DW, Hong JH, Jeong JI, Park HK, Moon JH, Lee YP, Benning P, Olson CG, Youn SJ, Min BI. Enhanced Fe 3d spectral weight near the Fermi level in Fe overlayers on Cr. Phys Rev B Condens Matter 1995; 51:1039-1044. [PMID: 9978254 DOI: 10.1103/physrevb.51.1039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kang J, Hong JH, Hwang DW, Jeong JI, Choi SD, Yang CJ, Lee YP, Olson CG, Kang K, Min BI. Hybridization and correlation effects in the photoemission spectra of RNi2 (R=Ce, Pr, and Nd). Phys Rev B Condens Matter 1994; 49:16248-16255. [PMID: 10010771 DOI: 10.1103/physrevb.49.16248] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Abstract
Levels of prostaglandin (PG) precursor acids, and PGE2, PGF2 alpha and TXB2 in sera of adult animals (5/species) were determined by gas chromatography and radioimmunoassay, respectively. The level of arachidonic acid in horse serum lipids was the lowest (0.61 +/- 0.03%), and that in dog serum lipids was the highest (18.1 +/- 1.8%). Bovine serum lipids contained considerable amounts of 20:3 omega 6 (precursor of monoene PG) and 20:5 omega 3 (precursor of triene PG) in addition to arachidonic acid. Thromboxane B2 was not the major species of endoperoxide metabolite synthesized by platelets from arachidonic acid in male ruminants and pig. The concentration of TXB2 in the serum of the lactating cow was more than 50 times greater than that of ovariectomized cows or of bulls. Although TXB2 was the major species of endoperoxide metabolite synthesized by human platelets, its serum concentration was much lower than that of nonruminant animals except the pig. These results showed that there were considerable variations in levels of PG and their precursors among various species of animals. The species variation in PG and TXB2 concentrations was not simply attributed to the differences in platelet concentration blood.
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