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Sidorenko GV, Miroslavov AE, Tyupina MY. Technetium(I) carbonyl complexes for nuclear medicine: Coordination-chemical aspect. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Sanad MH, Marzook FA, Mandal SK, Baidya M. Radiocomplexation and Biological Evaluation of [99mTc]Tricarbonyl Rabeprazole as a Radiotracer for Peptic Ulcer Localization. RADIOCHEMISTRY 2022. [DOI: 10.1134/s1066362222020138] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sanad MH, Eyssa HM, Marzook FA, Farag AB. Preparation and Bioevaluation of [99mTc]Tricarbonyl Omeprazole for Gastric Ulcer Localization in Mice. RADIOCHEMISTRY 2022. [DOI: 10.1134/s106636222201009x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sanad MH, Marzook FA, Farag AB, Mandal SK, Rizvi SFA, Gupta JK. Preparation, biological evaluation and radiolabeling of [99mTc]-technetium tricarbonyl procainamide as a tracer for heart imaging in mice. RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Abstract
This study focuses on the synthesis and preliminary bio-evaluation of [99mTc]-technetium tricarbonyl procainamide ([99mTc]-technetium tricarbony PA) as a viable cardiac imaging agent. The compound, [99mTc]-technetium tricarbony PA, was synthesized by labelling procainamide with a [99mTc]-technetium tricarbonyl core, yielding a high radiochemical yield and radiochemical purity of 98%. Under optimal circumstances, high radiochemical yield and purity were obtained utilizing [99mTc]-technetium tricarbonyl core within 30 min of incubation at pH 9, 200 µg substrate concentration, and 100 °C reaction temperature. The heart showed a high absorption of 32.39 ± 0.88% of the injected dose/g organ (ID/g), confirming the suitability of [99mTc]-technetium tricarbonyl PA as a viable complex for heart imaging.
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Affiliation(s)
- M. H. Sanad
- Labeled Compounds Department , Hot Laboratories Center, Egyptian Atomic Energy Authority , P.O. Box 13759 , Cairo , Egypt
| | - Fawzy A. Marzook
- Labeled Compounds Department , Hot Laboratories Center, Egyptian Atomic Energy Authority , P.O. Box 13759 , Cairo , Egypt
| | - Ayman B. Farag
- Pharmaceutical Chemistry Department , Faculty of Pharmacy, Ahram Canadian University , Giza , Egypt
| | - Sudip Kumar Mandal
- Department of Pharmaceutical Chemistry , Dr. B. C. Roy College of Pharmacy and Allied Health Sciences , Durgapur 713206 , West Bengal , India
| | - Syed F. A. Rizvi
- College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , Gansu , P. R. China
| | - Jeetendra Kumar Gupta
- Institute of Pharmaceutical Research , GLA University Mathura , Uttar Pradesh , India
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Sanad MH, Eyssa HM, Marzook FA, Rizvi SFA, Farag AB, Fouzy ASM, Bassem SA, Ibrahim AA. Synthesis, Radiolabeling, and Biological Evaluation of 99mTc-Tricarbonyl Mesalamine as a Potential Ulcerative Colitis Imaging Agent. RADIOCHEMISTRY 2022. [DOI: 10.1134/s1066362221060163] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Zhang J, Fu H, Tepper PG, Poelarends GJ. Biocatalytic Enantioselective Hydroaminations for Production of
N
‐Cycloalkyl‐Substituted L‐Aspartic Acids Using Two C−N Lyases. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801569] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jielin Zhang
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen, The Netherlands
| | - Haigen Fu
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen, The Netherlands
| | - Pieter G. Tepper
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen, The Netherlands
| | - Gerrit J. Poelarends
- Department of Chemical and Pharmaceutical Biology, Groningen Research Institute of Pharmacy University of Groningen Antonius Deusinglaan 1 9713 AV Groningen, The Netherlands
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Lipowska M, Klenc J, Taylor AT, Marzilli LG. fac- 99mTc/Re-tricarbonyl complexes with tridentate aminocarboxyphosphonate ligands: suitability of the phosphonate group in chelate ligand design of new imaging agents. Inorganica Chim Acta 2019; 486:529-537. [PMID: 30804606 PMCID: PMC6385875 DOI: 10.1016/j.ica.2018.11.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Ligands that coordinate via dianionic phosphonate groups have not been widely utilized in radiopharmaceuticals. N-(phosphonomethyl)iminodiacetic acid (1, PMIDA) and N-(phosphonomethyl)glycine (2, PMG) were investigated as new chelators for the 99mTc/Re-tricarbonyl "core" (fac-M(CO)3, M = 99mTc, Re) present in a major class of radiopharmaceuticals. fac-M(CO)3(PMIDA) and fac-M(CO)3(PMG) complexes were studied by HPLC and 1H/13C/31P NMR methods for M = Re (Re-1 and Re-2) and by HPLC for M = 99mTc ( 99m Tc-1 and 99m Tc-2). Re-1 and 99m Tc-1 complexes exhibit a similar pH-dependent equilibrium between geometric linkage isomers (M-1a and M-1b). However, only one isomer exists for M-2 under all conditions. Structural characterization by X-ray crystallography reveals the presence of a bond between a phosphonate oxygen and the Re(I) center in fac-Re(CO)3(PMG) (Re-2). Detailed comparisons of NMR data for Re-2 conclusively demonstrate that the phosphonate group is coordinated in Re-1b (isomer favored at high pH) but not in Re-1a, which has a dangling N-(phosphonomethyl) group. To our knowledge, Re-1b and Re-2 and their 99mTc analogs are the first well-documented examples of complexes with these metal-tricarbonyl cores having a dianionic phosphonate group directly coordinated in a fac-M(CO)3-O-P grouping. Pharmacokinetic studies using Sprague-Dawley rats reveal that 99m Tc-2 is a robust tracer. Hence, phosphonate groups should be considered in designing 99mTc and 186/188Re radiopharmaceuticals, including agents with bioactive moieties attached to dangling carboxylate or phosphonate groups.
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Affiliation(s)
- Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Andrew T. Taylor
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Fu H, Zhang J, Saifuddin M, Cruiming G, Tepper PG, Poelarends GJ. Chemoenzymatic asymmetric synthesis of the metallo-β-lactamase inhibitor aspergillomarasmine A and related aminocarboxylic acids. Nat Catal 2018. [DOI: 10.1038/s41929-018-0029-1] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Lipowska M, Jarkas N, Voll RJ, Nye JA, Klenc J, Goodman MM, Taylor AT. Re(CO) 3([ 18F]FEDA), a novel 18F PET renal tracer: Radiosynthesis and preclinical evaluation. Nucl Med Biol 2017; 58:42-50. [PMID: 29367095 DOI: 10.1016/j.nucmedbio.2017.12.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Revised: 12/05/2017] [Accepted: 12/11/2017] [Indexed: 11/15/2022]
Abstract
INTRODUCTION Our previous work demonstrated that the 99mTc renal tracer, 99mTc(CO)3(FEDA) (99mTc-1), has a rapid clearance comparable in rats to that of 131I-OIH, the radioactive gold standard for the measurement of effective renal plasma flow. The uncharged fluoroethyl pendant group of 99mTc-1 provides a route to the synthesis of a structurally analogous rhenium-tricarbonyl 18F renal imaging agent, Re(CO)3([18F]FEDA) (18F-1). Our goal was to develop an efficient one-step method for the preparation of 18F-1 and to compare its pharmacokinetic properties with those of 131I-OIH in rats. METHODS 18F-1 was prepared by the nucleophilic 18F-fluorination of its tosyl precursor. The labeled compound was isolated by HPLC and subsequently evaluated in Sprague-Dawley rats using 131I-OIH as an internal control and by dynamic PET/CT imaging. Plasma protein binding (PPB) and erythrocyte uptake (RCB) were determined and the urine was analyzed for metabolites. RESULTS 18F-1 was efficiently prepared as a single species with high radiochemical purity (>99%) and it displayed high radiochemical stability in vitro and in vivo. PPB was 87% and RCB was 21%. Biodistribution studies confirmed rapid renal extraction and high specificity for renal excretion, comparable to that of 131I-OIH, with minimal hepatic/gastrointestinal elimination. The activity in the urine, as a percentage of 131I-OIH, was 92% and 95% at 10 and 60 min, respectively. All other organs (heart, spleen, lungs) showed a negligible tracer uptake (<0.4% ID). Dynamic microPET/CT imaging demonstrated rapid transit of 18F-1 through the kidneys and into the bladder; there was no demonstrable activity in bone verifying the absence of free [18F]fluoride. CONCLUSIONS 18F-1 exhibited a high specificity for the kidney, rapid renal excretion comparable to that of 131I-OIH and high in vivo radiochemical stability. Not only is 18F-1 a promising PET renal tracer, but it provides a route to the development of a pair of analogous 18F/99mTc renal imaging agents with almost identical structures and comparable pharmacokinetic properties. These promising in vivo results warrant subsequent evaluation in humans.
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Affiliation(s)
- Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA.
| | - Nashwa Jarkas
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA
| | - Ronald J Voll
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA; Center for Systems Imaging, Emory University, Wesley Woods Health Center, 1841 Clifton Road, NE, Atlanta, GA 30329, USA
| | - Jonathon A Nye
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA; Center for Systems Imaging, Emory University, Wesley Woods Health Center, 1841 Clifton Road, NE, Atlanta, GA 30329, USA
| | - Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA
| | - Mark M Goodman
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA; Center for Systems Imaging, Emory University, Wesley Woods Health Center, 1841 Clifton Road, NE, Atlanta, GA 30329, USA
| | - Andrew T Taylor
- Department of Radiology and Imaging Sciences, Emory University, 1364 Clifton Road, NE, Atlanta, GA 30322, USA
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Synthesis, bioevaluation and gamma scintigraphy of 99mTc-N-2-(furylmethyl iminodiacetic acid) complex as a new renal radiopharmaceutical. J Radioanal Nucl Chem 2017. [DOI: 10.1007/s10967-017-5617-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Brink A, Helliwell JR. New leads for fragment-based design of rhenium/technetium radiopharmaceutical agents. IUCRJ 2017; 4:283-290. [PMID: 28512575 PMCID: PMC5414402 DOI: 10.1107/s2052252517003475] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Accepted: 03/03/2017] [Indexed: 05/22/2023]
Abstract
Multiple possibilities for the coordination of fac-[Re(CO)3(H2O)3]+ to a protein have been determined and include binding to Asp, Glu, Arg and His amino-acid residues as well as to the C-terminal carboxylate in the vicinity of Leu and Pro. The large number of rhenium metal complex binding sites that have been identified on specific residues thereby allow increased target identification for the design of future radiopharmaceuticals. The core experimental concept involved the use of state-of-art tuneable synchrotron radiation at the Diamond Light Source to optimize the rhenium anomalous dispersion signal to a large value (f'' of 12.1 electrons) at its LI absorption edge with a selected X-ray wavelength of 0.9763 Å. At the Cu Kα X-ray wavelength (1.5418 Å) the f'' for rhenium is 5.9 electrons. The expected peak-height increase owing to the optimization of the Re f'' was therefore 2.1. This X-ray wavelength tuning methodology thereby showed the lower occupancy rhenium binding sites as well as the occupancies of the higher occupancy rhenium binding sites.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State, Nelson Mandela Drive, Bloemfontein, Free State 9301, South Africa
| | - John R. Helliwell
- School of Chemistry, University of Manchester, Brunswick Street, Manchester M13 9PL, England
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Lipowska M, Klenc J, Jarkas N, Marzilli LG, Taylor AT. Monoanionic 99mTc-tricarbonyl-aminopolycarboxylate complexes with uncharged pendant groups: Radiosynthesis and evaluation as potential renal tubular tracers. Nucl Med Biol 2016; 47:48-55. [PMID: 28110124 DOI: 10.1016/j.nucmedbio.2016.12.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 12/19/2016] [Accepted: 12/21/2016] [Indexed: 11/15/2022]
Abstract
INTRODUCTION 99mTc(CO)3-nitrilotriacetic acid, 99mTc(CO)3(NTA), is a new renal tubular agent with pharmacokinetic properties comparable to those of 131I-OIH but the clearance of 99mTc(CO)3(NTA) and 131I-OIH is still less than the clearance of PAH, the gold standard for the measurement of effective renal plasma flow. At physiological pH, dianionic 99mTc(CO)3(NTA) has a mononegative inner metal-coordination sphere and a mononegative uncoordinated carboxyl group. To evaluate alternate synthetic approaches, we assessed the importance of an uncoordinated carboxyl group, long considered essential for tubular transport, by evaluating the pharmacokinetics of three analogs with the 99mTc(CO)3(NTA) metal-coordination sphere but with uncharged pendant groups. METHODS 99mTc(CO)3 complexes with N-(2-acetamido)iminodiacetic acid (ADA), N-(2-hydroxyethyl)iminodiacetic acid (HDA) and N-(fluoroethyl)iminodiacetic acid (FEDA) were prepared using a tricarbonyl kit and isolated by HPLC. The pharmacokinetics were evaluated in Sprague-Dawley rats, with 131I-OIH as an internal control; urine was analyzed for metabolites. Plasma protein binding and erythrocyte uptake were determined from the 10min blood samples. Re(CO)3(FEDA), the analog of 99mTc(CO)3(FEDA), was prepared and characterized. RESULTS 99mTc(CO)3(ADA), 99mTc(CO)3(HDA) and 99mTc(CO)3(FEDA) were efficiently prepared as a single species with high radiochemical purities (>99%). These new monoanionic 99mTc(CO)3 tracers with uncharged dangling groups all showed rapid blood clearance and high specificity for renal excretion. Activity in the urine, as a percent of 131I-OIH at 10 and 60min, was 96% and 99% for ADA, 96% and 100% for HDA, and 100% and 99% for FEDA, respectively. Each new tracer was excreted unchanged in the urine. The Re(CO)3(FEDA) structure adds compelling evidence that such 99mTc(CO)3(NTA) analogs have metal-coordination spheres identical to that of 99mTc(CO)3(NTA). CONCLUSIONS New tracers lacking the negatively charged pendant carboxyl group previously thought to be essential for rapid renal extraction, 99mTc(CO)3(ADA), 99mTc(CO)3(HDA) and 99mTc(CO)3(FEDA), exhibit pharmacokinetics in rats comparable to those of 99mTc(CO)3(NTA) and 131I-OIH. Furthermore, these encouraging results in rats warrant evaluation of this new tracer type in humans.
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Affiliation(s)
- Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, USA.
| | - Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, USA
| | - Nashwa Jarkas
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, USA
| | - Luigi G Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, USA
| | - Andrew T Taylor
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, GA, USA
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Klenc J, Lipowska M, Abhayawardhana PL, Taylor AT, Marzilli LG. Structure and Properties of fac-[Re(I)(CO)3(NTA)](2-) (NTA(3-) = Trianion of Nitrilotriacetic Acid) and fac-[Re(I)(CO)3(L)](n-) Analogues Useful for Assessing the Excellent Renal Clearance of the fac-[(99m)Tc(I)(CO)3(NTA)](2-) Diagnostic Renal Agent. Inorg Chem 2015; 54:6281-90. [PMID: 26068141 PMCID: PMC4863976 DOI: 10.1021/acs.inorgchem.5b00584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We previously identified two new agents based on the [(99m)Tc(V)O](3+) core with renal clearances in human volunteers 30% higher than that of the widely used clinical tracer (99m)Tc-MAG3 (MAG3(5-) = penta-anion of mercaptoacetyltriglycine). However, renal agents with even higher clearances are needed. More recently, we changed our focus from the [(99m)Tc(V)O](3+) core to the discovery of superior tracers based on the fac-[(99m)Tc(I)(CO)3](+) core. Compared to (99m)Tc-MAG3, fac-[(99m)Tc(I)(CO)3(NTA)](2-) (NTA(3-) = trianion of nitrilotriacetic acid) holds great promise by virtue of its efficient renal clearance via tubular secretion and the absence of hepatobiliary elimination, even in patients with severely reduced renal function. We report here NMR, molecular (X-ray) structure, and solution data on fac-[Re(I)(CO)3(NTA)](2-) with a -CH2CO2(-) dangling monoanionic chain and on two fac-[Re(I)(CO)3(L)](-) analogues with either a -CH2CONH2 or a -CH2CH2OH dangling neutral chain. In these three fac-[Re(I)(CO)3(L)](n-) complexes, the fac-[Re(I)(CO)3(N(CH2CO2)2)](-) moiety is structurally similar and has similar electronic properties (as assessed by NMR data). In reported and ongoing studies, the two fac-[(99m)Tc(I)(CO)3(L)](-) analogues with these neutral dangling chains were found to have pharmacokinetic properties very similar to those of fac-[(99m)Tc(I)(CO)3(NTA)](2-). Therefore, we reach the unexpected conclusion that in fac-[(99m)Tc(I)(CO)3(L)](n-) agents, renal clearance is affected much more than anticipated by features of the core plus the chelate rings (the [(99m)Tc(I)(CO)3(N(CH2CO2)2)](-) moiety) than by the presence of a negatively charged dangling carboxylate chain.
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Affiliation(s)
- Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | | | - Andrew T. Taylor
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Initial Evaluation of (99m)Tc(CO)3(ASMA) as a Renal Tracer in Healthy Human Volunteers. Nucl Med Mol Imaging 2014; 48:216-24. [PMID: 25177379 DOI: 10.1007/s13139-014-0270-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 02/19/2014] [Accepted: 02/20/2014] [Indexed: 10/25/2022] Open
Abstract
PURPOSE Preclinical studies in rats showed that two of (99m)Tc(CO)3(ASMA) isomers (rac- and L-ASMA) had pharmacokinetic properties equivalent to that of (131)I-OIH, the radiopharmaceutical standard for the measurement of effective renal plasma flow. The aim of this study was to evaluate the pharmacokinetics of (99m)Tc(CO)3(ASMA) isomers in healthy human subjects. METHODS Three ASMA ligands (rac-, L- and D-ASMA) were labeled with (99m)Tc(CO)3 using an IsoLink kit (Covidien), and each formed (99m)Tc(CO)3(ASMA) tracer was co-injected with (131)I-OIH into healthy human subjects followed by sequential imaging, plasma clearance measurements and timed urine collection. Plasma protein binding, red cell uptake and percent injected dose in the urine were determined. Urine from each group of volunteers was analyzed for metabolites by HPLC. RESULTS Image quality was excellent with all three agents. Each (99m)Tc(CO)3(ASMA) preparation was excreted unchanged in the urine. The plasma clearance ratio ((99m)Tc(CO)3(ASMA)/(131)I-OIH) was 81 ± 3 % for D-ASMA compared to only 20 ± 4 % for L-ASMA and 37 ± 7 % for rac-ASMA; the 81 % clearance ratio for D-ASMA isomer is still ∼ 30 % higher than the (99m)Tc-MAG3/(131)I-OIH clearance ratio (∼50-60 %). Red cell uptake was similar for all three tracers (6-9 %), and all tracers had a relatively rapid renal excretion; at 3 h, the (99m)Tc(CO)3(ASMA)/(131)I-OIH urine ratio was 100 ± 3 % for D-ASMA, 80 ± 2 % for L-ASMA and 88 ± 1 % for rac-ASMA. CONCLUSIONS The renal excretion characteristics of (99m)Tc(CO)3(D-ASMA) in humans are superior to those of the other two (99m)Tc(CO)3(ASMA) isomers studied, but are still inferior to (131)I-OIH, even though there was no difference in the clearance of two of (99m)Tc(CO)3(ASMA) isomers and (131)I-OIH in rats. The work described here demonstrates the sensitivity in in vivo biological behavior of (99m)Tc(CO)3(ASMA) isomers to their subtle structural differences.
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Abhayawardhana PL, Marzilli PA, Fronczek FR, Marzilli LG. Complexes possessing rare "tertiary" sulfonamide nitrogen-to-metal bonds of normal length: fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes with hydrophilic sulfonamide ligands. Inorg Chem 2014; 53:1144-55. [PMID: 24400928 PMCID: PMC4465231 DOI: 10.1021/ic4026987] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tertiary sulfonamide nitrogen-to-metal bonds of normal length are very rare. We recently discovered such a bond in one class of fac-[Re(CO)3(N(SO2R)(CH2Z)2)](n) complexes (Z = 2-pyridyl) with N(SO2R)dpa ligands derived from di-(2-picolyl)amine (N(H)dpa). fac-[M(CO)3(N(SO2R)(CH2Z)2)](n) agents (M = (186/188)Re, (99m)Tc) could find use as radiopharmaceutical bioconjugates when R is a targeting moiety. However, the planar, electron-withdrawing 2-pyridyl groups of N(SO2R)dpa destabilize the ligand to base and create relatively rigid chelate rings, raising the possibility that the rare M-N(sulfonamide) bond is an artifact of a restricted geometry. Also, the hydrophobic 2-pyridyl groups could cause undesirable accumulation in the liver, limiting future use in radiopharmaceuticals. Our goal is to identify a robust, hydrophilic, and flexible N(CH2Z)2 chelate framework. New C2-symmetric ligands, N(SO2R)(CH2Z)2 with (Z = CH2NH2; R = Me, dmb, or tol), were prepared by treating N(H)dien(Boc)2, a protected diethylenetriamine (N(H)dien) derivative, with methanesulfonyl chloride (MeSO2Cl), 3,5-dimethylbenzenesulfonyl chloride (dmbSO2Cl), and 4-methylbenzenesulfonyl chloride (tolSO2Cl). Treatment of fac-[Re(CO)3(H2O)3](+) with these ligands, designated as N(SO2R)dien, afforded new fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes. Comparing the fac-[Re(CO)3(N(SO2Me)dien)]PF6 and fac-[Re(CO)3(N(SO2Me)dpa)]PF6 complexes, we find that the Re(I)-N(sulfonamide) bonds are normal in length and statistically identical and that the methyl (13)C NMR signal has an unusually upfield shift compared to that in the free ligand. We attribute this unusual upfield shift to the fact that the sulfonamide N undergoes an sp(2)-to-sp(3) rehybridization upon coordination to Re(I) in both complexes. Thus, the sulfonamide N of N(SO2R)dien ligands is a good donor, even though the chelate rings are conformationally flexible. Addition of the strongly basic and potentially monodentate ligand, 4-dimethylaminopyridine, did not affect the fac-[Re(CO)3(N(SO2tol)dien)]PF6 complex, even after several weeks. This complex is also stable to heat in aqueous solution. These results indicate that N(SO2R)dien ligands form fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes sufficiently robust to be utilized for radiopharmaceutical development.
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Affiliation(s)
| | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Papagiannopoulou D, Triantis C, Vassileiadis V, Raptopoulou CP, Psycharis V, Terzis A, Pirmettis I, Papadopoulos MS. Synthesis, structural characterization and radiochemistry of di- and tricarbonyl Re(I) and 99mTc(I) complexes with 8-hydroxyquinoline or 8-mercaptoquinoline and triphenylphosphine. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.09.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Perera T, Abhayawardhana P, Marzilli PA, Fronczek FR, Marzilli LG. Formation of a metal-to-nitrogen bond of normal length by a neutral sufonamide group within a tridentate ligand. A new approach to radiopharmaceutical bioconjugation. Inorg Chem 2013; 52:2412-21. [PMID: 23421481 PMCID: PMC4465213 DOI: 10.1021/ic302180t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We demonstrate that a tertiary sulfonamide group, N(SO2R)R'2, can rehybridize to form a M-N bond of normal length even when the group is in a linear tridentate ligand, such as in the new tridentate N(SO2R)dpa ligands derived from di-(2-picolyl)amine (N(H)dpa). N(SO2R)dpa ligands were used to prepare fac-[Re(CO)3(N(SO2R)dpa)](PF6 or BF4) complexes. Structural characterization of the new complexes established that the tertiary sulfonamide nitrogen atom binds to Re with concomitant sp(2)-to-sp(3) rehybridization, facilitating facial coordination. The new fac-[Re(CO)3(N(SO2R)dpa)]X structures provide the only examples for any metal with the sulfonamide as part of a noncyclic linear tridentate ligand and with a normal metal-to-nitrogen(tertiary sulfonamide) bond length. Rare previous examples of such normal M-N bonds have been found only in more constrained situations, such as with tripodal tetradentate ligands. Our long-term objectives for the new tridentate N(SO2R)dpa ligands are to develop the fundamental chemistry relevant to the eventual use of the fac-[M(I)(CO)3](+) core (M = (99m)Tc, (186/188)Re) in imaging and therapy. The sulfonamide group uniquely contributes to two of our goals: expanding ways to conjugate the fac-[M(I)(CO)3](+) core to biological molecules and also developing new symmetrical tridentate ligands that can coordinate facially to this core. Tests of our conjugation method, conducted by linking the fac-[Re(I)(CO)3](+) core to a new tetraarylporphyrin (T(N(SO2C6H4)dpa)P) as well as to a dansyl (5-(dimethylamino)naphthalene-1-sulfonyl) group, demonstrate that large molecular fragments can be tethered via a coordinated tertiary sulfonamide linkage to this core.
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Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | | | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
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