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Cysteine Derivatized 99mTc-Labelled Fatty Acids as β-Oxidation Markers. INORGANICS 2019. [DOI: 10.3390/inorganics7110133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
With the aim of developing 99mTc-labeled fatty acids intended for myocardial metabolism imaging we report herein the synthesis and characterization of two novel derivatives of undecanonoic and hexadecanonoic acid that have been functionalized at the ω-site by cysteine through the formation of a thioether bond (Cys–FA11 and Cys–FA16). Equimolar amounts of each ligand and the [NEt4]2[Re(CO)3Br3] precursor generated the respective hexacoordinated neutral complexes in which the ligand coordinated to the metal through the SNO donor system of cysteine. The rhenium complexes were characterized by elemental analysis, IR and NMR spectroscopies. The analogous technetium-99m complexes, 99mTc–Cys–FA11 and 99mTc–Cys–FA16 were prepared by incubation of the ligand with the precursor [99mTc(CO)3(H2O)3]+ (radiochemical yield ≥98%). Their structure was established by comparative HPLC techniques. In vivo studies in mice showed high initial heart uptake for both 99mTc complexes (7.4 ± 0.53 and 7.07 ± 0.73 percentage of injected dose (%ID)/g at 1 min post injection. Rapid clearance (0.60 ± 0.02 %ID/g) was observed for 99mTc–Cys–FA11 while the clearance of the longer fatty acid 99mTc–Cys–FA16 was slower (2.31 ± 0.09 %ID/g at 15 min p.i.). Metabolite analysis study indicated that complexes were catabolized through the β-oxidation process.
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Das S, Mathur A, Sakhare N, Mallia MB, Sarma HD, Sachdev SS, Dash A. Synthesis and biodistribution studies of 99m Tc labeled fatty acid derivatives prepared via "Click approach" for potential use in cardiac imaging. J Labelled Comp Radiopharm 2018; 61:1048-1057. [PMID: 30171704 DOI: 10.1002/jlcr.3681] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Revised: 08/13/2018] [Accepted: 08/23/2018] [Indexed: 11/06/2022]
Abstract
123 I-Iodophenylpentadecanoic acid (IPPA) is a metabolic agent used in nuclear medicine for diagnosis of myocardial defects. Efforts are underway worldwide to develop a 99m Tc substitute of the above radiopharmaceutical for the aforementioned application. Herein, we report synthesis and biodistribution studies of 99m Tc labeled fatty acids (8, 11, and 15 carbons) obtained via "click chemistry" for its potential use in myocardial imaging. ω-Bromo fatty acids (8C/11C/15C) were synthetically modified at bromo terminal to introduce a heterocyclic triazole with glycine sidearm in a five step procedure. Modified fatty acids were subsequently radiolabeled with preformed [99m Tc(CO)3 ]+ synthon to yield the desired fatty acid complexes which were evaluated in Swiss mice. All the radiolabeled complexes were obtained with radiochemical purities >80%, as characterized by HPLC. Biodistribution studies of all three complexes in Swiss mice showed myocardial uptake of ~6-9% ID/g at 2 minutes post-injection, close to* I-IPPA (~9% ID/g). Complexes exhibited significant retention in the myocardium up to 30 minutes (~1% ID/g) but were lower to the standard agent (~7% ID/g). Similar uptake of activity in myocardium for the newly synthesized complexes in comparison to 125 I-IPPA along with favorable in vivo pharmacokinetics merits potential for the present "click" design of complexes for myocardial imaging.
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Affiliation(s)
- Soumen Das
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology (BRIT), Navi Mumbai, India.,Homi Bhabha National Institute (HBNI), Mumbai, India
| | - Anupam Mathur
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology (BRIT), Navi Mumbai, India
| | - Navin Sakhare
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology (BRIT), Navi Mumbai, India
| | - Madhava B Mallia
- Homi Bhabha National Institute (HBNI), Mumbai, India.,Radiopharmaceutical Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - Haladhar Dev Sarma
- Radiation Biology and Health Science Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
| | - Satbir Singh Sachdev
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology (BRIT), Navi Mumbai, India
| | - Ashutosh Dash
- Homi Bhabha National Institute (HBNI), Mumbai, India.,Radiopharmaceutical Division, Bhabha Atomic Research Centre (BARC), Mumbai, India
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Jain A, Mathur A, Pandey U, Sarma HD, Dash A. Synthesis and evaluation of 68Ga labeled palmitic acid for cardiac metabolic imaging. Appl Radiat Isot 2018; 140:35-40. [PMID: 29936274 DOI: 10.1016/j.apradiso.2018.06.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Revised: 04/17/2018] [Accepted: 06/03/2018] [Indexed: 11/26/2022]
Abstract
This work evaluates the potential of a 68Ga labeled long chain 16C fatty acid for cardiac metabolic imaging. For radiolabeling with 68Ga, hexadecanedioic acid was coupled with the chelator p-NH2-Bn-NOTA. Under the optimized conditions, NOTA-hexadecanoic acid could be radiolabeled with 68Ga in ≥95% yields. In biodistribution studies carried out in Swiss mice, 68Ga-NOTA-hexadecanoic acid showed low myocardial uptake at 2 min p.i. (3.7 ± 1.3%ID/g). While 68Ga-NOTA-hexadecanoic acid cleared rapidly from non-target organs such as blood, lungs, intestine and kidney, wash out from liver was slow. Radio-HPLC analyses of myocardial extracts of rats injected with 68Ga-NOTA-hexadecanoic acid confirmed its metabolic transformation in the myocardium.
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Affiliation(s)
- Akanksha Jain
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Anupam Mathur
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology, Navi Mumbai 400703, India
| | - Usha Pandey
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
| | - Haladhar Dev Sarma
- Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Ashutosh Dash
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
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Synthesis and biological evaluation of fatty acid derivatives for myocardial imaging containing [99mTc(CO)3]+. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5258-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Jain A, Mathur A, Pandey U, Sarma HD, Dash A. 68Ga labeled fatty acids for cardiac metabolic imaging: Influence of different bifunctional chelators. Bioorg Med Chem Lett 2016; 26:5785-5791. [PMID: 27793567 DOI: 10.1016/j.bmcl.2016.10.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 08/18/2016] [Accepted: 10/14/2016] [Indexed: 02/02/2023]
Abstract
Development of 68Ga labeled fatty acids is of immense interest due to the availability of 68Ga through a generator and its superiority over SPECT based tracers in carrying out dynamic imaging on a PET scanner. Our present work explores the influence of different chelators on the cardiac uptake and pharmacokinetics of the 68Ga-labeled fatty acids. Two new 68Ga labeled fatty acids were synthesized by conjugation of 11-aminoundecanoic acid with the bifunctional chelators (BFCs) viz. p-SCN-Bn-DTPA (S-2-(4-isothiocyanatobenzyl)-diethylenetriaminepentaacetic acid) and p-SCN-Bn-NODAGA (S-2-(4-isothiocyanatobenzyl)-1,4,7-triazacyclononane-1-glutaric acid-4,7-acetic acid) and their comparison was carried out with the previously reported 68Ga-NOTA-undecanoic acid. Both the conjugates were radiolabeled with 68Ga in high yields and purities (>95%). Their formation was established by preparation and characterization of their inactive analogs with natGa at macroscopic levels. Biodistribution studies of the complexes in Swiss mice showed lower initial myocardial uptake for 68Ga-NODAGA-undecanoic acid (3.8±0.6%ID/g) and 68Ga-DTPA-undecanoic acid (1.3±0.5%ID/g) complexes in comparison to previously reported 68Ga-NOTA-undecanoic acid complex (7.4±2.8%ID/g) at 2min p.i. However, significant retention of the tracer in the myocardium was observed in the case of 68Ga-NODAGA-undecanoic complex, which led to improved heart/non-target ratios of the complex over time in comparison to the other 68Ga complexes. Similarly, the DTPA complex exhibited increased washout from the liver in comparison to other 68Ga derivatives. The β oxidation mechanism in myocytes was investigated by isolating the myocardial extract post intravenous injection of the respective 68Ga complexes and analyzing them by radio-HPLC, which showed metabolic transformation of the parent fatty acid complex peak in all the three complexes. This study has provided an insight into the design characteristics of 68Ga labeled fatty acids to achieve the desired myocardial imaging characteristics.
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Affiliation(s)
- Akanksha Jain
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Anupam Mathur
- Radiopharmaceuticals Program, Board of Radiation and Isotope Technology, Navi Mumbai 400 703, India
| | - Usha Pandey
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Haladhar Dev Sarma
- Radiation Biology & Health Sciences Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
| | - Ashutosh Dash
- Radiopharmaceuticals Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
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Xue Q, Wang H, Liu J, Wang D, Zhang H. Synthesis and biodistribution of novel dipicolylamine 99mTc-(CO)3-labeled fatty acid derivatives for myocardial imaging. J Radioanal Nucl Chem 2016. [DOI: 10.1007/s10967-016-4916-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Li X, Wu A, Xue Q, Fang Y, Liu J, Zhang H, Bao H. Synthesis and biological evaluation of fatty acids containing 99mTc-oxo and 99mTc-nitrido for myocardial metabolism imaging. J Radioanal Nucl Chem 2015. [DOI: 10.1007/s10967-015-4232-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Mathur A, Sharma AK, Murhekar VV, Mallia MB, Pawade S, Sarma HD, Chaudhari P, Sachdev SS, Banerjee S. Syntheses and biological evaluation of99mTc-HYNIC-fatty acid complexes for myocardial imaging. RSC Adv 2015. [DOI: 10.1039/c5ra12683e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The aim of the present study is to identify a99mTc-labeled fatty acid tracer which could be a possible substitute of the widely used123I-labeled fatty acids in studying myocardial metabolism and in detection of myocardial abnormalities.
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Affiliation(s)
- Anupam Mathur
- Radiopharmaceuticals Program
- Board of Radiation and Isotope Technology
- Navi Mumbai-400703
- India
| | - Abhishek K. Sharma
- Radiopharmaceuticals Program
- Board of Radiation and Isotope Technology
- Navi Mumbai-400703
- India
| | - V. V. Murhekar
- Radiopharmaceuticals Program
- Board of Radiation and Isotope Technology
- Navi Mumbai-400703
- India
| | - Madhava B. Mallia
- Radipharmaceuticals Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Shital Pawade
- Advanced Centre for Treatment
- Research & Education in Cancer
- Tata Memorial Centre
- Navi Mumbai-410210
- India
| | - H. D. Sarma
- Radiation Biology and Health Sciences Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Pradip Chaudhari
- Advanced Centre for Treatment
- Research & Education in Cancer
- Tata Memorial Centre
- Navi Mumbai-410210
- India
| | - S. S. Sachdev
- Radiopharmaceuticals Program
- Board of Radiation and Isotope Technology
- Navi Mumbai-400703
- India
| | - Sharmila Banerjee
- Radipharmaceuticals Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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Jindal A, Mathur A, Pandey U, Sarma HD, Chaudhari P, Dash A. Development of68Ga-labeled fatty acids for their potential use in cardiac metabolic imaging. J Labelled Comp Radiopharm 2014; 57:463-9. [DOI: 10.1002/jlcr.3205] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Revised: 04/10/2014] [Accepted: 04/15/2014] [Indexed: 12/12/2022]
Affiliation(s)
- Akanksha Jindal
- Isotope Applications & Radiopharmaceuticals Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Anupam Mathur
- Radiopharmaceuticals Program; Board of Radiation and Isotope Technology; Mumbai 400703 India
| | - Usha Pandey
- Isotope Applications & Radiopharmaceuticals Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - H. D. Sarma
- Radiation Biology and Health Sciences Division; Bhabha Atomic Research Centre; Mumbai 400085 India
| | - Pradip Chaudhari
- Advanced Centre for Treatment, Research & Education in Cancer; Tata Memorial Centre; Mumbai 410210 India
| | - Ashutosh Dash
- Isotope Applications & Radiopharmaceuticals Division; Bhabha Atomic Research Centre; Mumbai 400085 India
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Synthesis, radiolabeling and evaluation of a new positively charged 99mTc-labeled fatty acid derivative for myocardial imaging. J Labelled Comp Radiopharm 2010. [DOI: 10.1002/jlcr.1836] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Tu Z, Li S, Sharp TL, Herrero P, Dence CS, Gropler RJ, Mach RH. Synthesis and evaluation of 15-(4-(2-[¹⁸F]Fluoroethoxy)phenyl)pentadecanoic acid: a potential PET tracer for studying myocardial fatty acid metabolism. Bioconjug Chem 2010; 21:2313-9. [PMID: 21070001 DOI: 10.1021/bc100343h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
15-(4-(2-[¹⁸F]fluoroethoxy)phenyl)pentadecanoic acid ([¹⁸F]7) was synthesized as a PET probe for assessing myocardial fatty acid metabolism. The radiosynthesis of [¹⁸F]7 was accomplished using a two-step reaction, starting with the corresponding tosylate ester, methyl 15-(4-(2-(tosyloxy)ethoxy)phenyl)pentadecanoate (5), and gave the radiolabeled fatty acid, [¹⁸F]7 in a radiolabeling yield of 55-60% and a specific activity of >2000 Ci/mmol (decay corrected to EOB). The biological evaluation of [¹⁸F]7 in rats displayed high uptake in heart (1.94%ID/g at 5 min), which was higher than the uptake (%ID/g) in blood, lung, muscle, pancreas, and brain. MicroPET studies of [¹⁸F]7 in Sprague-Dawley rats demonstrated excellent images of the myocardium when compared with [¹¹C]palmitate images in the same animal. Moreover, the tracer kinetics of [¹⁸F]7 paralleled those seen with [¹¹C]palmitate, with an early peak followed by biphasic washout. When compared to [¹¹C]palmitate, [¹⁸F]7 exhibited a slower early clearance (0.17 ± 0.01 vs 0.30 ± 0.02, P < 0.0001) and a significantly higher late clearance (0.0030 ± 0.0005 vs 0.0006 ± 0.00013, P < 0.01). These initial studies suggest that [¹⁸F]7 could be a potentially useful clinical PET tracer to assess abnormal myocardial fatty acid metabolism.
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Affiliation(s)
- Zhude Tu
- Division of Radiological Sciences, Washington University School of Medicine, St. Louis, Missouri 63110, USA
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Mathur A, Mallia MB, Sarma HD, Banerjee S, Venkatesh M. Evaluation of new positively charged 11- and 12-carbon 99mTc-labeled fatty acid derivatives for myocardial imaging. J Labelled Comp Radiopharm 2010. [DOI: 10.1002/jlcr.1784] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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