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Chen SH, Kuo YT, Singh G, Cheng TL, Su YZ, Wang TP, Chiu YY, Lai JJ, Chang CC, Jaw TS, Tzou SC, Liu GC, Wang YM. Development of a Gd(III)-based receptor-induced magnetization enhancement (RIME) contrast agent for β-glucuronidase activity profiling. Inorg Chem 2012; 51:12426-35. [PMID: 23116118 DOI: 10.1021/ic301827p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
β-Glucuronidase is a key lysosomal enzyme and is often overexpressed in necrotic tumor masses. We report here the synthesis of a pro receptor-induced magnetization enhancement (pro-RIME) magnetic resonance imaging (MRI) contrast agent ([Gd(DOTA-FPβGu)]) for molecular imaging of β-glucuronidase activity in tumor tissues. The contrast agent consists of two parts, a gadolinium complex and a β-glucuronidase substrate (β-d-glucopyranuronic acid). The binding association constant (KA) of [Gd(DOTA-FPβGu)] is 7.42 × 10(2), which is significantly lower than that of a commercially available MS-325 (KA = 3.0 × 10(4)) RIME contrast agent. The low KA value of [Gd(DOTA-FPβGu)] is due to the pendant β-d-glucopyranuronic acid moiety. Therefore, [Gd(DOTA-FPβGu)] can be used for detection of β-glucuronidase through RIME modulation. The detail mechanism of enzymatic activation of [Gd(DOTA-FPβGu)] was elucidated by LC-MS. The kinetics of β-glucuronidase catalyzed hydrolysis of [Eu(DOTA-FPβGu)] at pH 7.4 best fit the Miechalis-Menten kinetic mode with Km = 1.38 mM, kcat = 3.76 × 10(3), and kcat/Km = 2.72 × 10(3) M(-1) s(-1). The low Km value indicates high affinity of β-glucuronidase for [Gd(DOTA-FPβGu)] at physiological pH. Relaxometric studies revealed that T1 relaxivity of [Gd(DOTA-FPβGu)] changes in response to the concentration of β-glucuronidase. Consistent with the relaxometric studies, [Gd(DOTA-FPβGu)] showed significant change in MR image signal in the presence of β-glucuronidase and HSA. In vitro and in vivo MR images demonstrated appreciable differences in signal enhancement in the cell lines and tumor xenografts in accordance to their expression levels of β-glucuronidase.
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Affiliation(s)
- Shih-Hsien Chen
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University , 100 Shih-Chuan first Road, Kaohsiung 807, Taiwan
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Liu KX, Kato Y, Matsumoto K, Nakamura T, Kaku T, Sugiyama Y. Characterization of the Enhancing Effect of Protamine on the Proliferative Activity of Hepatocyte Growth Factor in Rat Hepatocytes. Pharm Res 2009; 26:1012-21. [DOI: 10.1007/s11095-008-9810-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2008] [Accepted: 12/11/2008] [Indexed: 10/21/2022]
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Polášek M, Šedinová M, Kotek J, Vander Elst L, Muller RN, Hermann P, Lukeš I. Pyridine-N-oxide Analogues of DOTA and Their Gadolinium(III) Complexes Endowed with a Fast Water Exchange on the Square-Antiprismatic Isomer. Inorg Chem 2008; 48:455-65. [DOI: 10.1021/ic801596v] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Miloslav Polášek
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Miroslava Šedinová
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Jan Kotek
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Luce Vander Elst
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Robert N. Muller
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Petr Hermann
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
| | - Ivan Lukeš
- Department of Inorganic Chemistry, Charles University, Hlavova 2030, 128 40 Prague 2, Czech Republic, and NMR and Molecular Imaging Laboratory, Department of General, Organic and Biomedical Chemistry, University of Mons-Hainaut, Avenue du champ de Mars 24, B-7000 Mons, Belgium
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