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Sahoo P, Pathak NK, Scott Bohle D, Dodd EL, Tripathy U. Hematin anhydride (β-hematin): An analogue to malaria pigment hemozoin possesses nonlinearity. Spectrochim Acta A Mol Biomol Spectrosc 2024; 310:123902. [PMID: 38281463 DOI: 10.1016/j.saa.2024.123902] [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: 09/06/2023] [Revised: 12/08/2023] [Accepted: 01/15/2024] [Indexed: 01/30/2024]
Abstract
Hematin anhydride (β-hematin), the synthetic analogue of the malaria pigment, "hemozoin", is a heme dimer produced by reciprocal covalent bonds among carboxylic acid groups on the protoporphyrin-IX ring and the iron atom present in the two adjacent heme molecules. Hemozoin is a disposal product formed from the digestion of hemoglobin present in the red blood cells infected with hematophagous malaria parasites. Besides, as the parasites invade red blood cells, hemozoin crystals are eventually released into the bloodstream, where they accumulate over time in tissues. Severe malaria infection leads to significant dysfunction in vital organs such as the liver, spleen, and brain in part due to the autoimmune response to the excessive accumulation of hemozoin in these tissues. Also, the amount of these crystals in the vasculature correlates with disease progression. Thus, hemozoin is a unique indicator of infection used as a malaria biomarker and hence, used as a target for the development of antimalarial drugs. Hence, exploring various properties of hemozoin is extremely useful in the direction of diagnosis and cure. The present study focuses on finding one of the unknown properties of β-hematin in physiological conditions by using the Z-scan technique, which is simple, sensitive, and economical. It is observed that hemozoin possesses one of the unique material properties, i.e., nonlinearity with a detection limit of ∼ 15 µM. The self-defocusing action causes β-hematin to exhibit negative refractive nonlinearity. The observed data is analyzed with a thermal lensing model. We strongly believe that our simple and reliable approach to probing the nonlinearity of β-hematin will provide fresh opportunities for malaria diagnostics & cure in the near future.
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Affiliation(s)
- Priyadarshi Sahoo
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
| | - Nitesh Kumar Pathak
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
| | - D Scott Bohle
- Department of Chemistry, McGill University, Montreal H3A 0B8, Quebec, Canada
| | - Erin L Dodd
- Département de Chimie, Université du Québec à Montréal, 2101, rue Jeanne-Mance Montréal, H2X 2J6 Québec, Canada
| | - Umakanta Tripathy
- Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India.
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Suárez L, Kosar AJ, Dodd EL, Tazoo D, Lambert AC, Bohle DS. Soluble meso and deuteroporphyrin analogs of the malaria pigment hematin anhydride. J Inorg Biochem 2024; 252:112470. [PMID: 38218137 DOI: 10.1016/j.jinorgbio.2023.112470] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/18/2023] [Accepted: 12/18/2023] [Indexed: 01/15/2024]
Abstract
Two soluble heme analogs of the insoluble malaria pigment hematin anhydride (HA, or β-hematin), [Fe(III)(protoporphyrin)]2, with either mesoporphyrin (MHA) or deuteroporphyrin (DHA) are characterized by elemental analysis, SEM, IR spectroscopy, electronic spectroscopy, paramagnetic 1H NMR spectroscopy and solution magnetic susceptibility. While prior single crystal and X-ray powder diffraction results indicate all three have a common propionate linked dimer motif, there is considerable solid state variation in the conformation. This is associated with enhanced solubility of MHA and DHA. As with HA, DHA undergoes thermally promoted reversible hydration/dehydration in the solid state. Solution 1H NMR studies of DHA suggest a high spin dimeric structure with the porphyrin methyls distributed between two isomers which are also present in the solid state. These soluble iron(III)porphyrin dimers allow for the first direct solution studies by NMR and UV-Vis spectroscopies of these key species. Taken together the results illustrate the importance and utility of varying the substituents on the periphery of the porphyrin for studying heme aggregation and malaria pigment formation.
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Affiliation(s)
- Liliana Suárez
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal H3A 0B8, Canada
| | - Aaron J Kosar
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal H3A 0B8, Canada
| | - Erin L Dodd
- Département de Chimie de l'UQAM, 2101, rue Jeanne-Mance, Montréal H2X 2J6, Canada
| | - Dagobert Tazoo
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal H3A 0B8, Canada
| | | | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal H3A 0B8, Canada.
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Kapuku B, Bohle DS. Synthesis and Photolysis Properties of a New Chloroquine Photoaffinity Probe. Molecules 2024; 29:1084. [PMID: 38474595 DOI: 10.3390/molecules29051084] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/19/2024] [Accepted: 02/20/2024] [Indexed: 03/14/2024] Open
Abstract
A new chloroquine-derived photoaffinity probe has been prepared by a convergent synthesis from derivative of 4,7-dichloroquinoline and N1,N1-diethyl-N4-methylpentane. The features of this probe are a unique 3-azido photolabel, the pyridine ring of the quinoline, and the presence of a secondary amine at the 4-position of the quinoline. These features, particularly the 4-amino methylation, prevent triazole formation through combination of the 3-azide and the 4-amine. This undergoes facile cleavage with exposure to a medium-pressure mercury lamp with a 254 nm excitation wavelength. Trapping of the nitrene byproduct is accomplished with its reaction with N-phenylmaleimide as its cycloazidation product. The structure of a ring-opened DBU amine has been structurally characterized.
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Affiliation(s)
- Benita Kapuku
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
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Gaydon Q, Bohle DS. Coordination Chemistry of the Parent Dithiocarbamate H 2NCS 2-: Organometallic Chemistry and Tris-Chelates of Group 9 Metals. Inorg Chem 2022; 61:4660-4672. [PMID: 35261230 DOI: 10.1021/acs.inorgchem.1c03789] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two tris-chelate complexes of cobalt and rhodium and two complexes of Ru(II) of dithiocarbamate, [S2CNH2]-, were synthesized. The complexes were spectroscopically characterized by IR, NMR, UV-vis, and MS and structurally characterized by X-ray diffraction. The structural features of the rhodium complex were compared to those of other tris-chelate Rh(III) dithiocarbamate complexes and are characterized by a change in the ground-state geometry in comparison to expected octahedral tris-chelate complexes. This was confirmed both experimentally by X-ray diffraction and theoretically using DFT calculations. The inversion barriers of Rh(Bz2dtc)3, Ir(Bz2dtc)3, and Rh(Et2dtc)3 were determined using VT-NMR in DMSO. These barriers were found to be surprisingly low for heavy group 9 elements of d6 tris-chelate complexes: values of 16.7, 17.1, and 16.4 kcal/mol were calculated, respectively. By comparing structural features, we are able to determine that the activation barrier for the inversion of stereochemistry of Rh(H2dtc)3 must have a similarly low value. A modified version of the Bailar twist involving an intermediate with C3h geometry was proposed as the mechanism of inversion.
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Affiliation(s)
- Quentin Gaydon
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Quebec, Canada
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Mersaoui SY, Guilbert C, Chou H, Douillet C, Bohle DS, Stýblo M, Richard S, Mann KK. Arsenic 3 methyltransferase (AS3MT) automethylates on cysteine residues in vitro. Arch Toxicol 2022; 96:1371-1386. [PMID: 35244730 PMCID: PMC9013690 DOI: 10.1007/s00204-022-03248-8] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 02/02/2022] [Indexed: 11/25/2022]
Abstract
Arsenic toxicity is a global concern to human health causing increased incidences of cancer, bronchopulmonary, and cardiovascular diseases. In human and mouse, inorganic arsenic (iAs) is metabolized in a series of methylation steps catalyzed by arsenic (3) methyltransferase (AS3MT), forming methylated arsenite (MAsIII), dimethylarsenite (DMAIII) and the volatile trimethylarsine (TMA). The methylation of arsenic is coordinated by four conserved cysteines proposed to participate in catalysis, namely C33, C62, C157, and C207 in mouse AS3MT. The current model consists of AS3MT methylating iAs in the presence of the cofactor S-adenosyl-L-methionine (SAM), and the formation of intramolecular disulfide bonds following the reduction of MAsV to MAsIII. In the presence of endogenous reductants, these disulfide bonds are reduced, the enzyme re-generates, and the second round of methylation ensues. Using in vitro methylation assays, we find that AS3MT undergoes an initial automethylation step in the absence of iAs. This automethylation is enhanced by glutathione (GSH) and dithiothreitol (DTT), suggesting that reduced cysteines accept methyl groups from SAM to form S-methylcysteines. Following the addition of iAs, automethylation of AS3MT is decreased. Furthermore, using a Flag-AS3MT immunoprecipitation coupled to MS/MS, we identify both C33 and C62 as acceptors of the methyl group in vivo. Site-directed mutagenesis (C to A) revealed that three of the previously described cysteines were required for AS3MT automethylation. In vitro experiments show that automethylated AS3MT can methylate iAs in the presence of SAM. Thus, we propose that automethylated may represent an active conformation of AS3MT.
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Affiliation(s)
- Sofiane Y Mersaoui
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Cynthia Guilbert
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Hsiang Chou
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada
| | - Christelle Douillet
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, CB# 7461, Chapel Hill, NC, 27599, USA
| | - D Scott Bohle
- Department of Chemistry, McGill University, Otto Maass 233A, Montréal, Québec, H3A 0B8, Canada
| | - Miroslav Stýblo
- Department of Nutrition, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, CB# 7461, Chapel Hill, NC, 27599, USA
| | - Stéphane Richard
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada.
| | - Koren K Mann
- Segal Cancer Center, Lady Davis Institute for Medical Research and Departments of Oncology and Medicine, McGill University, Montréal, Québec, H3T 1E2, Canada.
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Bohle DS, Wharf I, Gaydon Q, Kapuku B, Bellamare MJ, Paul M, Wynter T, Karageorghis PJ. Structural chemistry at McGill. CAN J CHEM 2022. [DOI: 10.1139/cjc-2021-0165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A brief description of some of the key individuals at McGill University and their contributions to the development of crystallography is given. This is followed by examples of recent structure determinations, which include organic heterocycles, natural products, inorganic salts, and organometallic complexes. Specifically, the bispyridinium adduct of protoporphyrin, the piperidinyl adduct of 3,7-dichloroquinine, trisbenzylmethylthiol, sodium methylarsonium (V), potassium hydroxylamine sulfonate, Vaska’s complex adduct from the oxidative addition of p-tolylmercaptan, and a bis isocyanoiminotriphenylphosphorane adduct of rutheniumdichloridetristriphenylphosphine are described.
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Affiliation(s)
- D. Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Ivor Wharf
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Quentin Gaydon
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Benita Kapuku
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Marie J. Bellamare
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Mirna Paul
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Tamika Wynter
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
| | - Philip J. Karageorghis
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, QC H3A 0B8, Canada
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7
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VanderSchee CR, Frier D, Kuter D, Mann KK, Jackson BP, Bohle DS. Quantification of local zinc and tungsten deposits in bone with LA-ICP-MS using novel hydroxyapatite-collagen calibration standards. J Anal At Spectrom 2021; 36:2431-2438. [PMID: 35992610 PMCID: PMC9390078 DOI: 10.1039/d1ja00211b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Tungsten has recently emerged as a potential toxicant and is known to heterogeneously deposit in bone as reactive polytungstates. Zinc, which accumulates in regions of bone remodeling, also has a heterogenous distribution in bone. Determining the local concentrations of these metals will provide valuable information about their mechanisms of uptake and action. A series of bone (BN), 7:3 hydroxyapatite:collagen (HC), and hydroxyapatite (HA) standards were spiked with tungsten and zinc and used as calibration standards for laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analysis of bone tissue. The analytical performance of these standards was studied and validated at different step sizes using NIST SRM 1486 Bone Meal. The effect of matrix-matched calibration was assessed by comparing the calibration with BN and HC standards, which incorporate both inorganic and organic components of bone, to that of HA standards. HC standards were found to be more homogenous (RSD < 10%) and provide a linear calibration with better accuracy (R2 > 0.994) compared to other standards. The limits of detection for HC at a 15 μm step size were determined to be 0.24 and 0.012 μg g-1 for zinc and tungsten, respectively. Using this approach, we quantitatively measured zinc and tungsten deposits in the femoral bone of a mouse exposed to 15 μg mL-1 tungsten for four weeks. Localized concentrations of zinc (942 μg g-1) and tungsten (15.7 μg g-1) at selected regions of enrichment were substantially higher than indicated by bulk measurements of these metals.
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Affiliation(s)
- Cassidy R VanderSchee
- Department of Chemistry, McGill University, Montreal, H3A 0B8, Canada
- Department of Chemistry, The King's University, Edmonton, T6H 2H3, Canada
| | - David Frier
- Department of Chemistry, McGill University, Montreal, H3A 0B8, Canada
| | - David Kuter
- Department of Chemistry, McGill University, Montreal, H3A 0B8, Canada
| | - Koren K Mann
- Lady Davis Institute for Medical Research, Gerald Bronfman Department of Oncology, McGill University, 3755 Cote Ste Catherine Rd, Montreal, H3T 1E2 Canada
| | - Brian P Jackson
- Department of Earth Sciences, Dartmouth College, Hanover, NH 03755, USA
| | - D Scott Bohle
- Department of Chemistry, McGill University, Montreal, H3A 0B8, Canada
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Spina CJ, Notarandrea-Alfonzo JE, Guerra ED, Goodall C, Bohle DS, Precht R. Synthesis and Structural and Spectroscopic Studies of a pH-Neutral Argentic Chelate Complex: Tribasic Silver (III) Bisperiodate. ACS Omega 2021; 6:27017-27025. [PMID: 34693121 PMCID: PMC8529604 DOI: 10.1021/acsomega.1c03523] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 09/20/2021] [Indexed: 06/13/2023]
Abstract
The preparation of stable hypervalent metal complexes containing Ag(III) has historically been challenging due to their propensity for reduction under ambient conditions. This work explores the preparation of a tripotassium silver bisperiodate complex as a tetrahydrate via chemical oxidation of the central silver atom and orthoperiodate chelation. The isolation of the chelate complex in high yield and purity was achieved via acidimetric titration. The comprehensive physiochemical characterization of the tribasic silver bisperiodate included single crystal X-ray diffraction, thermogravimetric and differential scanning calorimetry, and infrared and ultraviolet-visible spectroscopy. Infrared and UV-visible absorption spectra (λmax 255 and 365 nm) were in good agreement with historically prepared pentabasic diperiodatoargentate chelate complexes. The C2/c monoclinic distorted square planar structure of the bis-chelate complex affords a mutually supportive framework to both Ag(III) and I(VII), conferring stability under both thermal and long-term ambient conditions. Thermal analysis of the tribasic silver bisperiodate complex identified an endothermic mass loss, ΔH = +278.35 kJ/mol, observed at 139.0 °C corresponding to a solid-state reduction of silver from Ag(III) to Ag(I). Under ambient conditions, no significant degradation was observed over a 12 month period (P = 0.30) for the silver bisperiodate complex in a solid state, with an observed half-life of τ1/2 = 147 days in a pH-neutral aqueous solution.
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Affiliation(s)
| | | | | | | | | | - Rod Precht
- Exciton
Pharma Corp, Toronto, Ontario M5G 1L7, Canada
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9
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Simmons M, Cummings Premack K, Guerra ED, Bohle MJ, Rosadiuk KA, Bohle DS. 2,3,5-Metallotriazoles: Amphoteric Mesoionic Chelates from Nitrosoguanidines. Inorg Chem 2021; 60:9621-9630. [PMID: 34160210 DOI: 10.1021/acs.inorgchem.1c00844] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Soluble nitrosoguanidine- and N-methylnitrosoguanidine-based metallotriazole complexes of ruthenium(II) monocarbonyls have been prepared and characterized. Both nitrosoguanidines prove to be strong chelates with the formally π-accepting nitroso nitrogen binding cis to carbon monoxide and a π-donating amide trans to the CO. The resulting ensemble consists of ruthenium examples of 1-metallo-2,3,5-triazoles. The ruthenium coordination sphere is completed by anions, either H-, Cl-, or Ph-, trans to the nitroso group as well as two mutually trans PPh3 groups. The π-donating amide group is formally sp2 hybridized with a planar nitrogen to give a strongly bound five-membered chelating anion. Together, these results illustrate the remarkable potential for the nitrosoguanidinates as a family of new metal chelates.
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Affiliation(s)
- Mimi Simmons
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
| | - Kayla Cummings Premack
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
| | - E Danae Guerra
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
| | - Maeve J Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
| | - Kristopher A Rosadiuk
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal H3A 0B8, Canada
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Negro Silva LF, Makhani K, Lemaire M, Lemarié CA, Plourde D, Bolt AM, Chiavatti C, Bohle DS, Lehoux S, Goldberg MS, Mann KK. Sex-Specific Effects of Prenatal and Early Life Inorganic and Methylated Arsenic Exposure on Atherosclerotic Plaque Development and Composition in Adult ApoE-/- Mice. Environ Health Perspect 2021; 129:57008. [PMID: 34014776 PMCID: PMC8136521 DOI: 10.1289/ehp8171] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 02/26/2021] [Accepted: 03/19/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND Epidemiologic studies indicate that early life arsenic exposures are linked to an increased risk of cardiovascular diseases. Different oxidation and methylation states of arsenic exist in the environment and are formed in vivo via the action of arsenic (+3 oxidation state) methyltransferase (As3MT). Methylated arsenicals are pro-atherogenic postnatally, but pre- and perinatal effects are unclear. This is particularly important because methylated arsenicals are known to cross the placenta. OBJECTIVES We tested the effects of early life exposure to inorganic and methylated arsenicals on atherosclerotic plaque formation and its composition in apolipoprotein E knock-out (apoE-/-) mice and evaluated whether apoE-/- mice lacking As3MT expression were susceptible to this effect. METHODS We exposed apoE-/- or apoE-/-/As3MT-/- mice to 200 ppb inorganic or methylated arsenic in the drinking water from conception to weaning and assessed atherosclerotic plaques in the offspring at 18 wk of age. Mixed regression models were used to estimate the mean difference in each outcome relative to controls, adjusting for sex and including a random effects term to account for within-litter clustering. RESULTS Early life exposure to inorganic arsenic, and more profoundly methylated arsenicals, resulted in significantly larger plaques in the aortic arch and sinus in both sexes. Lipid levels in these plaques were higher without a substantial difference in macrophage numbers. Smooth muscle cell content was not altered, but collagen content was lower. Importantly, there were sex-specific differences in these observations, where males had higher lipids and lower collagen in the plaque, but females did not. In mice lacking As3MT, arsenic did not alter the plaque size, although the size was highly variable. In addition, control apoE-/-/As3MT-/- mice had significantly larger plaque size compared with control apoE-/-. CONCLUSION This study shows that early life exposure to inorganic and methylated arsenicals is pro-atherogenic with sex-specific differences in plaque composition and a potential role for As3MT in mice. https://doi.org/10.1289/EHP8171.
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Affiliation(s)
| | - Kiran Makhani
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Maryse Lemaire
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Catherine A. Lemarié
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
- EA3878, European University of Occidental Brittany, Brest, France
- UMR 1078, Institut national de la santé et de la recherché médicale, Brest, France
| | - Dany Plourde
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Alicia M. Bolt
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Christopher Chiavatti
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - D. Scott Bohle
- Department of Chemistry, McGill University, Montreal, Quebec, Canada
| | - Stéphanie Lehoux
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
| | - Mark S. Goldberg
- Department of Medicine, McGill University, Montreal, Quebec, Canada
- Department of Epidemiology, Biostatistics, and Occupational Health, McGill University, Montreal, Quebec, Canada
- Division of Clinical Epidemiology, Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Koren K. Mann
- Lady Davis Institute for Medical Research, McGill University, Montreal, Quebec, Canada
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Fulas OA, Laferriere A, Stein RS, Bohle DS, Coderre TJ. Topical combination of meldonium and N‐acetyl cysteine relieves allodynia in rat models of CRPS‐1 and peripheral neuropathic pain by enhancing NO‐mediated tissue oxygenation. J Neurochem 2020; 152:570-584. [DOI: 10.1111/jnc.14943] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 12/13/2019] [Accepted: 12/16/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Oli A. Fulas
- Department of Anesthesia McGill University Montreal QC Canada
| | | | - Robin S. Stein
- Department of Chemistry McGill University Montreal QC Canada
| | - D. Scott Bohle
- Department of Chemistry McGill University Montreal QC Canada
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12
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VanderSchee CR, Kuter D, Chou H, Jackson BP, Mann KK, Bohle DS. Addressing K/L-edge overlap in elemental analysis from micro-X-ray fluorescence: bioimaging of tungsten and zinc in bone tissue using synchrotron radiation and laser ablation inductively coupled plasma mass spectrometry. Anal Bioanal Chem 2019; 412:259-265. [PMID: 31776641 DOI: 10.1007/s00216-019-02244-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 08/16/2019] [Revised: 10/01/2019] [Accepted: 10/28/2019] [Indexed: 01/21/2023]
Abstract
Synchrotron radiation micro-X-ray fluorescence (SR-μXRF) is a powerful elemental mapping technique that has been used to map tungsten and zinc distribution in bone tissue. However, the heterogeneity of the bone samples along with overlap of the tungsten L-edge with the zinc K-edge signals complicates SR-μXRF data analysis, introduces minor artefacts into the resulting element maps, and decreases image sensitivity and resolution. To confirm and more carefully delineate these SR-μXRF results, we have employed laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to untangle the problem created by the K/L-edge overlap of the tungsten/zinc pair. While the overall elemental distribution results are consistent between the two techniques, LA-ICP-MS provides significantly higher sensitivity and image resolution compared with SR-μXRF measurements in bone. These improvements reveal tissue-specific distribution patterns of tungsten and zinc in bone, not observed using SR-μXRF. We conclude that probing elemental distribution in bone is best achieved using LA-ICP-MS, though SR-μXRF retains the advantage of being a non-destructive method with the capability of being paired with X-ray techniques, which determine speciation in situ. Since tungsten is an emerging contaminant recently found to accumulate in bone, accurately determining its distribution and speciation in situ is essential for directing toxicological studies and informing treatment regimes. Graphical abstract Tungsten and zinc localization and uptake in mouse femurs were imaged by synchrotron radiation, left, and by laser ablation ICP-MS, right. The increased resolution of the LA-ICP-MS technique resolves the problem of the overlap in tungsten's L-edge and zinc's K-edge.
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Affiliation(s)
| | - David Kuter
- Department of Chemistry, McGill University, Montreal, H3A0B8, Canada
| | - Hsiang Chou
- Lady Davis Institute for Medical Research, McGill University, 3755 Cote Ste Catherine Rd, Montreal, H3T 1E2, Canada
| | - Brian P Jackson
- Department of Earth Sciences, Dartmouth College, Hanover, NH, 03755, USA
| | - Koren K Mann
- Lady Davis Institute for Medical Research, McGill University, 3755 Cote Ste Catherine Rd, Montreal, H3T 1E2, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, Montreal, H3A0B8, Canada.
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13
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Guerra ED, Baakdah F, Gourgas O, Tam M, Stevenson MM, Georges E, Bohle DS, Cerruti M. Inorganic ions on hemozoin surface provide a glimpse into Plasmodium biology. J Inorg Biochem 2019; 200:110808. [PMID: 31487576 DOI: 10.1016/j.jinorgbio.2019.110808] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 05/15/2019] [Revised: 08/23/2019] [Accepted: 08/24/2019] [Indexed: 11/30/2022]
Abstract
In malaria, Plasmodium parasites produce hemozoin (Hz) as a route to detoxify free heme released from the catabolism of hemoglobin. Hz isolated from the parasites is encapsulated in an organic layer constituted by parasite and host components. This organic coating may play a role in Hz formation and in the immunomodulatory properties attributed to Hz, and they may influence the mode of action of antimalarials that block Hz formation. In this work, we analyze the organic layer adhered to Hz, and find Na, Cl, Si, Ca and P present, in addition to organic material. Our results suggest that Na, Cl, and P adsorb during Hz release from the red blood cells, while Si and Ca derive from components present during Hz biomineralization within the digestive vacuole of the parasite. Overall, we show that inorganic elements associated with Hz surface provide insights into the biological functions of Plasmodium parasites.
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Affiliation(s)
- E Danae Guerra
- Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 2B2, Canada
| | - Fadi Baakdah
- Institute of Parasitology, McGill University, Ste Anne de Bellevue, Quebec H9X 3V9, Canada
| | - Ophélie Gourgas
- Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 2B2, Canada
| | - Mifong Tam
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Mary M Stevenson
- Department of Microbiology and Immunology, McGill University, Montreal, Quebec H3A 2B4, Canada; Department of Medicine, McGill University, Montreal, Quebec H4A 3J1, Canada
| | - Elias Georges
- Institute of Parasitology, McGill University, Ste Anne de Bellevue, Quebec H9X 3V9, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, Montreal, Quebec H3A 0C5, Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University, Montreal, Quebec H3A 2B2, Canada.
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14
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Kuter D, Suárez L, Dodd EL, Noll BC, Stephens PW, Bohle DS. Hydrating the Bispropionate Notch in Malaria Pigment: A New Structural Motif in the Iron(III)(deuteroporphyrin) Dimer. Chemistry 2019; 25:4373-4378. [PMID: 30499153 DOI: 10.1002/chem.201805116] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 10/10/2018] [Indexed: 11/11/2022]
Abstract
Treating deuterohemin, chloro(deuteroporphyrinato)iron(III), with a non-coordinating base in DMSO/methanol allows for the isolation of [(deuteroporphyrinato)iron(III)]2 , deuterohematin anhydride (DHA), an analogue of malaria pigment, the natural product of heme detoxification by malaria. The structure of DHA obtained from this solvent system has been solved by X-ray powder diffraction analysis and displays many similarities, yet important structural differences, to malaria pigment. Most notably, a water molecule of solvation occupies a notch created by the propionate side chains and stabilizes a markedly bent propionate ligand coordinated with a long Fe-O bond, and a carboxylate cluster associated with water molecules is generated. Together, these features account for its increased solubility and more open structure, with an increased porphyrin-porphyrin separation. The IR spectroscopic signature associated with this structure also accounts for the strong IR band at 1587 cm-1 seen for many amorphous preparations of synthetic malaria pigment, and it is proposed that stabilizing these structures may be a new objective for antimalarial drugs. The important role of the vinyl substituents in this biochemistry is further demonstrated by the structure of deuterohemin obtained by single-crystal X-ray diffraction analysis.
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Affiliation(s)
- David Kuter
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, H3A 0B8, Canada.,Department of Chemistry and Polymer Science, Stellenbosch University, Private Bag X1, Matieland, Stellenbosch, 7602, South Africa
| | - Liliana Suárez
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, H3A 0B8, Canada
| | - Erin L Dodd
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, H3A 0B8, Canada
| | - Bruce C Noll
- Bruker-AXS, 5465 E Cheryl Pkwy, Fitchburg, WI, 53711, USA
| | - Peter W Stephens
- Department of Physics and Astronomy, State University of New York, Stony Brook, Stony Brook, New York, 11794-3800, USA
| | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke St. W., Montreal, H3A 0B8, Canada
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15
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Rosadiuk KA, Scott Bohle D. Isolable Adducts of Tertiary Amines and Dinitrogen Trioxide. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800654] [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: 11/07/2022]
Affiliation(s)
| | - D. Scott Bohle
- Department of Chemistry McGill University 801 Sherbrooke St.W. H3A 0B8 Montreal Canada
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16
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Barsan MM, Bellemare MJ, Butler IS, Gilson DFR, Bohle DS. Micro-Raman high-pressure investigation on the malaria pigment hematin anhydride (β-hematin). J Inorg Biochem 2018; 189:180-184. [PMID: 30296621 DOI: 10.1016/j.jinorgbio.2018.09.014] [Citation(s) in RCA: 1] [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] [Received: 05/07/2018] [Revised: 08/27/2018] [Accepted: 09/15/2018] [Indexed: 10/28/2022]
Abstract
The effect of pressure on the Raman and fluorescence spectra of hematin anhydride (β-hematin) is reported. In a diamond-anvil cell, DAC, with applied pressures up to 41 kbar, the Raman spectrum undergoes a series of intensity enhancements and increases in energy for many of the Raman-active bands up to a pressure of ~27 kbar. At higher pressures, there is either a leveling out or a decrease in the energies of these vibrational modes. The fluorescence bands also undergo a series of pressure- sensitive changes where, up to 10 kbar, there is a marked quenching of the intensity of the emissive bands, which is accompanied by a net increase in energy of the vibrational bands. The results are interpreted in terms of a high-pressure phase change, to account for the Raman shifts, and a separate defect or surface site of the emissive state, which is more efficiently quenched at higher pressure.
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Affiliation(s)
- Mirela M Barsan
- Department of Chemistry, McGill University, 801 Sherbrooke West, Montreal H3A OB8, Canada
| | - Marie-Josée Bellemare
- Department of Chemistry, McGill University, 801 Sherbrooke West, Montreal H3A OB8, Canada
| | - Ian S Butler
- Department of Chemistry, McGill University, 801 Sherbrooke West, Montreal H3A OB8, Canada
| | - Denis F R Gilson
- Department of Chemistry, McGill University, 801 Sherbrooke West, Montreal H3A OB8, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke West, Montreal H3A OB8, Canada.
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17
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Mewes JM, Jerabek P, Bohle DS, Schwerdtfeger P. Front Cover: The Light-Driven Isomerization of Aqueous Nitrate: A Theoretical Perspective (ChemPhotoChem 8/2018). CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201800161] [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: 11/11/2022]
Affiliation(s)
- Jan-Michael Mewes
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - Paul Jerabek
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - D. Scott Bohle
- The Department of Chemistry; McGill University; 801 Sherbrooke St. W Montreal H3A 8B0 Canada
| | - Peter Schwerdtfeger
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
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18
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Mewes JM, Jerabek P, Bohle DS, Schwerdtfeger P. The Light-Driven Isomerization of Aqueous Nitrate: A Theoretical Perspective. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201800022] [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: 11/11/2022]
Affiliation(s)
- Jan-Michael Mewes
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - Paul Jerabek
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - D. Scott Bohle
- The Department of Chemistry; McGill University; 801 Sherbrooke St. W Montreal H3A 8B0 Canada
| | - Peter Schwerdtfeger
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
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19
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Mewes JM, Jerabek P, Bohle DS, Schwerdtfeger P. The Light-Driven Isomerization of Aqueous Nitrate: A Theoretical Perspective. CHEMPHOTOCHEM 2018. [DOI: 10.1002/cptc.201800160] [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: 11/10/2022]
Affiliation(s)
- Jan-Michael Mewes
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - Paul Jerabek
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
| | - D. Scott Bohle
- The Department of Chemistry; McGill University; 801 Sherbrooke St. W Montreal H3A 8B0 Canada
| | - Peter Schwerdtfeger
- The New Zealand Institute for Advanced Study; Massey University (Albany); Private Bag 102904, North Shore, 0632 Auckland New Zealand
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20
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Stephens PW, Suárez L, Dodd EL, Kuter D, Bohle DS. A new malaria pigment structural motif and potential drug target. Acta Crystallogr A Found Adv 2018. [DOI: 10.1107/s0108767318097854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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21
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Rosadiuk KA, Stein RS, Bohle DS. Linkage Scrambling in Branched Chain Polymercury Compounds: Nitrides from the Mercury‐Mediated Disproportionation of N
2
O
3. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201701191] [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: 11/12/2022]
Affiliation(s)
| | - Robin S. Stein
- Department of Chemistry McGill University 801 Sherbrooke St. W. H3A Montreal 0B8 Canada
| | - D. Scott Bohle
- Department of Chemistry McGill University 801 Sherbrooke St. W. H3A Montreal 0B8 Canada
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22
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Affiliation(s)
| | - D. Scott Bohle
- Department of Chemistry McGill University 801 Sherbrooke St.W. H3A 0B8 Montreal Canada
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23
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Lee CM, Wu WY, Chiang MH, Bohle DS, Lee GH. Generation of a Mn(IV)–Peroxo or Mn(III)–Oxo–Mn(III) Species upon Oxygenation of Mono- and Binuclear Thiolate-Ligated Mn(II) Complexes. Inorg Chem 2017; 56:10559-10569. [DOI: 10.1021/acs.inorgchem.7b01513] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [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)
- Chien-Ming Lee
- Department of Applied
Science, National Taitung University, Taitung 950, Taiwan
| | - Wun-Yan Wu
- Department of Applied
Science, National Taitung University, Taitung 950, Taiwan
| | | | - D. Scott Bohle
- Department
of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada
| | - Gene-Hsiang Lee
- Instrumentation
Center, National Taiwan University, Taipei 107, Taiwan
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24
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Dodd EL, Tazoo D, Bohle DS. Solution and Solid State Correlations of Antimalarial Drug Actions: NMR and Crystallographic Studies of Drug Interactions with a Heme Model. Inorg Chem 2017. [PMID: 28650618 DOI: 10.1021/acs.inorgchem.7b00526] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Solution NMR has been used in tandem with a diamagnetic non-iron heme model compound as a simple and effective tool to rapidly probe the structures of the bound complexes formed between the metalloporphyrin and antimalarial drugs from the 4-aminoquinoline, 4-methylenehydroxylquinoline, and 8-aminoquinoline subfamilies. The ability of gallium(III) protoporphyrin IX to mimic heme chemistry is exploited. The 4-aminoquinolines quinacrine and amodiaquine and two novel 3-halo chloroquine analogues are found to bind to the metalloporphyrin through hydrogen-bonding and stacking interactions, while halofantrine and the 4-methylenehydroxylquinolines, quinine and mefloquine bind through the alcohol group of the drug. In each case, detailed structural information is available from the NMR assessment. The mefloquine model is confirmed crystallographically. The 8-aminoquinoline primaquine does not interact strongly. These tools show promise for future applications in assessing antimalarials in preclinical development for heme-binding drug targets.
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Affiliation(s)
- Erin L Dodd
- Department of Chemistry, McGill University , Montreal, H3A OB8, Quebec, Canada
| | - Dagobert Tazoo
- Department of Chemistry, McGill University , Montreal, H3A OB8, Quebec, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University , Montreal, H3A OB8, Quebec, Canada
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25
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Negro Silva LF, Lemaire M, Lemarié CA, Plourde D, Bolt AM, Chiavatti C, Bohle DS, Slavkovich V, Graziano JH, Lehoux S, Mann KK. Effects of Inorganic Arsenic, Methylated Arsenicals, and Arsenobetaine on Atherosclerosis in the Mouse Model and the Role of As3mt-Mediated Methylation. Environ Health Perspect 2017; 125:077001. [PMID: 28728140 PMCID: PMC5744679 DOI: 10.1289/ehp806] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Revised: 12/21/2016] [Accepted: 12/21/2016] [Indexed: 05/03/2023]
Abstract
BACKGROUND Arsenic is metabolized through a series of oxidative methylation reactions by arsenic (3) methyltransferase (As3MT) to yield methylated intermediates. Although arsenic exposure is known to increase the risk of atherosclerosis, the contribution of arsenic methylation and As3MT remains undefined. OBJECTIVES Our objective was to define whether methylated arsenic intermediates were proatherogenic and whether arsenic biotransformation by As3MT was required for arsenic-enhanced atherosclerosis. METHODS We utilized the apoE−/− mouse model to compare atherosclerotic plaque size and composition after inorganic arsenic, methylated arsenical, or arsenobetaine exposure in drinking water. We also generated apoE−/−/As3mt−/− double knockout mice to test whether As3MT-mediated biotransformation was required for the proatherogenic effects of inorganic arsenite. Furthermore, As3MT expression and function were assessed in in vitro cultures of plaque-resident cells. Finally, bone marrow transplantation studies were performed to define the contribution of As3MT-mediated methylation in different cell types to the development of atherosclerosis after inorganic arsenic exposure. RESULTS We found that methylated arsenicals, but not arsenobetaine, are proatherogenic and that As3MT is required for arsenic to induce reactive oxygen species and promote atherosclerosis. Importantly, As3MT was expressed and functional in multiple plaque-resident cell types, and transplant studies indicated that As3MT is required in extrahepatic tissues to promote atherosclerosis. CONCLUSION Taken together, our findings indicate that As3MT acts to promote cardiovascular toxicity of arsenic and suggest that human AS3MT SNPs that correlate with enzyme function could predict those most at risk to develop atherosclerosis among the millions that are exposed to arsenic. https://doi.org/10.1289/EHP806.
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Affiliation(s)
| | - Maryse Lemaire
- Lady Davis Institute for Medical Research
- Department of Oncology
| | | | | | - Alicia M Bolt
- Lady Davis Institute for Medical Research
- Department of Oncology
| | | | - D Scott Bohle
- Department of Chemistry, McGill University, Montréal, Québec, Canada
| | - Vesna Slavkovich
- Mailman School of Public Health, Columbia University, New York, New York, USA
| | - Joseph H Graziano
- Mailman School of Public Health, Columbia University, New York, New York, USA
| | - Stéphanie Lehoux
- Lady Davis Institute for Medical Research
- Division of Experimental Medicine
- Department of Medicine, and
| | - Koren K Mann
- Lady Davis Institute for Medical Research
- Division of Experimental Medicine
- Department of Oncology
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26
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Ponka P, Sheftel AD, English AM, Scott Bohle D, Garcia-Santos D. Do Mammalian Cells Really Need to Export and Import Heme? Trends Biochem Sci 2017; 42:395-406. [PMID: 28254242 DOI: 10.1016/j.tibs.2017.01.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2016] [Revised: 01/13/2017] [Accepted: 01/26/2017] [Indexed: 01/07/2023]
Abstract
Heme is a cofactor that is essential to almost all forms of life. The production of heme is a balancing act between the generation of the requisite levels of the end-product and protection of the cell and/or organism against any toxic substrates, intermediates and, in this case, end-product. In this review, we provide an overview of our understanding of the formation and regulation of this metallocofactor and discuss new research on the cell biology of heme homeostasis, with a focus on putative transmembrane transporters now proposed to be important regulators of heme distribution. The main text is complemented by a discussion dedicated to the intricate chemistry and biochemistry of heme, which is often overlooked when new pathways of heme transport are conceived.
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Affiliation(s)
- Prem Ponka
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, QC, H3T 1E2, Canada; Department of Physiology, McGill University, Montréal, QC, H3G 1Y6, Canada.
| | - Alex D Sheftel
- Spartan Bioscience Inc., Ottawa, ON, K2H 1B2, Canada; High Impact Editing, Ottawa, ON, K1B 3Y6, Canada
| | - Ann M English
- Department of Chemistry and Biochemistry, Centre for Research in Molecular Modeling and PROTEO, Concordia University, Montréal, QC, H4B 1R, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, Montréal, QC, H3A 0B8, Canada
| | - Daniel Garcia-Santos
- Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, QC, H3T 1E2, Canada; Department of Physiology, McGill University, Montréal, QC, H3G 1Y6, Canada
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27
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Abstract
The primary nitrosamides, here exemplified by the N-nitrosoalkylcarbamates, ROC(O)NHNO [R = CH3 (1), R = C2H5 (2)], show a markedly Lewis acid dependent chemistry.
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Affiliation(s)
| | - Zhijie Chua
- Department of Chemistry
- McGill University
- Montreal
- Canada
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28
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Ke CH, Chen CH, Tsai ML, Wang HC, Tsai FT, Chiang YW, Shih WC, Bohle DS, Liaw WF. {Fe(NO)2}9 Dinitrosyl Iron Complex Acting as a Vehicle for the NO Radical. J Am Chem Soc 2016; 139:67-70. [DOI: 10.1021/jacs.6b11454] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Chun-Hung Ke
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chien-Hong Chen
- Department
of Medical Applied Chemistry, Chung Shan Medical University, and Department
of Medical Education, Chung Shan Medical University Hospital, Taichung 40201, Taiwan
| | - Ming-Li Tsai
- Department
of Chemistry, National Sun Yat-sen University, Kaohsiung 80424, Taiwan
| | - Hsuan-Chi Wang
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Fu-Te Tsai
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yun-Wei Chiang
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Wei-Chih Shih
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - D. Scott Bohle
- Department
of Chemistry, McGill University 801 Sherbrooke Street West, Montreal, Quebec H3A2K6, Canada
| | - Wen-Feng Liaw
- Department
of Chemistry and Frontier Research Center of Fundamental and Applied
Science of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
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29
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Poisson J, Butler IS, Bohle DS. π-Delocalization in the vicinal lone pairs of hydrazines: Electronic effects in derivatives of 1-(2-nitrophenyl)-1-phenylhydrazine. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2016.02.061] [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: 11/26/2022]
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30
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Affiliation(s)
- D. Scott Bohle
- Department of Chemistry; McGill University; 801 Sherbrooke St. W. Montreal, Quebec H3A 0B8 Canada
| | - Zhijie Chua
- Department of Chemistry; McGill University; 801 Sherbrooke St. W. Montreal, Quebec H3A 0B8 Canada
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31
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Lo FC, Hsieh CC, Maestre-Reyna M, Chen CY, Ko TP, Horng YC, Lai YC, Chiang YW, Chou CM, Chiang CH, Huang WN, Lin YH, Bohle DS, Liaw WF. Crystal Structure Analysis of the Repair of Iron Centers Protein YtfE and Its Interaction with NO. Chemistry 2016; 22:9768-76. [DOI: 10.1002/chem.201600990] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Indexed: 11/07/2022]
Affiliation(s)
- Feng-Chun Lo
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
| | - Chang-Chih Hsieh
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
| | | | - Chin-Yu Chen
- Department of Life Sciences; National Central University; Taoyuan Taiwan
| | - Tzu-Ping Ko
- Institute of Biological Chemistry; Academia Sinica; Taipei Taiwan
| | - Yih-Chern Horng
- Department of Chemistry; National Changhua University of Education; Changhua Taiwan
| | - Yei-Chen Lai
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
| | - Yun-Wei Chiang
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
| | - Chih-Mao Chou
- Department of Life Sciences; National Central University; Taoyuan Taiwan
| | | | - Wei-Ning Huang
- Department of Biotechnology; Yuanpei University; Hsinchu Taiwan
| | - Yi-Hung Lin
- National Synchrotron Radiation Research Center Hsinchu; Taiwan
| | - D. Scott Bohle
- Department of Chemistry; McGill University; 801 Sherbrooke Street West Montreal QC H3A2K6 Canada
| | - Wen-Feng Liaw
- Department of Chemistry; National Tsing Hua University; Hsinchu 30013 Taiwan
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32
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Edaye S, Tazoo D, Bohle DS, Georges E. 3-Iodo-4-aminoquinoline derivative sensitises resistant strains of Plasmodium falciparum to chloroquine. Int J Antimicrob Agents 2016; 47:482-5. [PMID: 27211211 DOI: 10.1016/j.ijantimicag.2016.03.016] [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: 02/14/2016] [Revised: 03/16/2016] [Accepted: 03/23/2016] [Indexed: 10/21/2022]
Abstract
Chloroquine (CQ), the first cost-effective synthetic antimalarial, is rendered ineffective in malaria-endemic regions owing to the rise and spread of CQ-resistant Plasmodium falciparum. In this report, we show that a halogen derivative of CQ, namely 3-iodo-CQ, inhibits the proliferation of CQ-sensitive and -resistant P. falciparum in a verapamil-insensitive manner. Similar to CQ, the antimalarial activity of 3-iodo-CQ is likely due to its inhibition of β-haematin formation. Interestingly, the presence of non-inhibitory concentrations of 3-iodo-CQ potentiated the antiproliferative activity of CQ against CQ-resistant strains or P. falciparum transfectants expressing wild-type or mutant P. falciparum CQ resistance transporter (PfCRT) (C2(GC03) or C4(Dd2), respectively). These findings demonstrate that halogenation of the third position of 4-aminoquinoline, with a simple one-step reaction from CQ, generates a novel derivative that is active against CQ-sensitive and -resistant P. falciparum, possibly by inhibiting the activity of mutant PfCRT.
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Affiliation(s)
- Sonia Edaye
- Institute of Parasitology, Macdonald Campus, McGill University, Sainte-Anne-de-Bellevue, Quebec H9X 3V9, Canada
| | - Dagobert Tazoo
- Department of Chemistry, McGill University, Quebec, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University, Quebec, Canada
| | - Elias Georges
- Institute of Parasitology, Macdonald Campus, McGill University, Sainte-Anne-de-Bellevue, Quebec H9X 3V9, Canada.
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33
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Abstract
During the intraerythrocytic stage of malaria, the parasite digests hemoglobin and aggregates the released heme as an insoluble crystalline material called hemozoin. This detoxification step is an excellent drug target for developing new antimalarials, which can bind to hemozoin surface to inhibit further growth. Although the bulk crystalline properties of hemozoin are well-known, the surface properties remain poorly defined. Here, we use a combination of spectroscopic and adsorption techniques to study the surface of synthetic hemozoin, hematin anhydride, produced by two different methods. We show that the two synthetic methods produce crystals with major differences, such as the amount of water adsorbed on the surface and surface carboxylate groups. These results imply that the methodology to produce hematin anhydride affects its surface reactivity; this information needs to be considered whenever hematin anhydride is used as a model to study host immune response or to design new antimalarials.
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Affiliation(s)
- E Danae Guerra
- Department of Mining and Materials Engineering, McGill University , Montreal, Quebec H3A 2B2, Canada
| | - D Scott Bohle
- Department of Chemistry, McGill University , Montreal, Quebec H3A 0B8, Canada
| | - Marta Cerruti
- Department of Mining and Materials Engineering, McGill University , Montreal, Quebec H3A 2B2, Canada
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34
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Berkessa SC, Clarke ZJ, Fotie J, Bohle DS, Grimm CC. Silver(I)-mediated regioselective oxidative cross-coupling of phenol and aniline derivatives resulting in 2′-aminobiphenyl-2-ols. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.02.111] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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35
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Sivakumar R, Askari MS, Woo S, Madwar C, Ottenwaelder X, Bohle DS, Cuccia LA. Homochiral crystal generation via sequential dehydration and Viedma ripening. CrystEngComm 2016. [DOI: 10.1039/c6ce00119j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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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36
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Habibian M, Martínez-Montero S, Portella G, Chua Z, Bohle DS, Orozco M, Damha MJ. Seven-Membered Ring Nucleoside Analogues: Stereoselective Synthesis and Studies on Their Conformational Properties. Org Lett 2015; 17:5416-9. [PMID: 26492193 DOI: 10.1021/acs.orglett.5b02769] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Maryam Habibian
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A
0B8, Canada
| | - Saúl Martínez-Montero
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A
0B8, Canada
| | - Guillem Portella
- Chemistry
Department, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Zhijie Chua
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A
0B8, Canada
| | - D. Scott Bohle
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A
0B8, Canada
| | - Modesto Orozco
- Joint
BSC-CRG-IRB Programme on Computational Biology, Institute for Research in Biomedicine, Baldiri i Reixac 19, 08028 Barcelona, Spain
- Departament
de Bioquímica i Biologia Molecular, Facultat de Biologia, Universitat de Barcelona, Avgda Diagonal 643, 08028 Barcelona, Spain
| | - Masad J. Damha
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, QC H3A
0B8, Canada
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37
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Bohle DS, Chua Z, Singer Hobbs M, Perepichka I, Waked A. Stabilizing and Activating Nitrogen Catenates. Chemistry 2015; 21:13739-47. [DOI: 10.1002/chem.201501241] [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] [Received: 03/29/2015] [Indexed: 11/11/2022]
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38
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Abstract
Nitric oxide is an efficient catalyst for the cis-trans (E/Z) isomerization of diazenes. We compare the effect of room temperature solutions bearing low concentrations of nitric oxide, nitrogen dioxide, or oxygen on the rate of cis-trans isomerization, CTI, of the alkene bond in stilbene and on the azo double bond in azobenzene, as well as in four azo derivatives as measured by UV-vis spectroscopy. These rate enhancements can be as large as 3 orders of magnitude for azobenzene in solution. A mechanism is proposed where catalysis is promoted by the interaction of the nitric oxide with the diazene nitrogen lone pairs. Density functional theory, B3LYP/6-311++g** suggests that the binding of NO to the diazene should be weak and reversible but that its NO adduct has an E/Z isomerization barrier of 7.5 kcal/mol.
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Affiliation(s)
- D Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke Street W., Montreal H3A 0B8, Canada
| | - Kristopher A Rosadiuk
- Department of Chemistry, McGill University, 801 Sherbrooke Street W., Montreal H3A 0B8, Canada
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39
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Lincoln R, Greene LE, Bain C, Flores-Rizo JO, Bohle DS, Cosa G. When Push Comes to Shove: Unravelling the Mechanism and Scope of Nonemissive meso-Unsaturated BODIPY Dyes. J Phys Chem B 2015; 119:4758-65. [PMID: 25751527 DOI: 10.1021/acs.jpcb.5b02080] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Richard Lincoln
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
| | - Lana E. Greene
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
| | - Cheryl Bain
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
| | - Juan O. Flores-Rizo
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
- Departamento
de Química, Universidad de Guanajuato, Col. Noria Alta S/N, Guanajuato, Gto 36050, Mexico
| | - D. Scott Bohle
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
| | - Gonzalo Cosa
- Department
of Chemistry and Center for Self Assembled Chemical Structures, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 2K6, Canada
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40
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Affiliation(s)
- D. Scott Bohle
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
| | - Zhijie Chua
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec H3A 0B8, Canada
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41
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Abou Assi H, Martínez-Montero S, Dixit DM, Chua Z, Bohle DS, Damha MJ. Synthesis, Structure, and Conformational Analysis of Nucleoside Analogues Comprising Six-Membered 1,3-Oxathiane Sugar Rings. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403642] [Citation(s) in RCA: 2] [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] [Indexed: 11/10/2022]
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42
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Ban SR, Wang HN, Toader V, Bohle DS, Li CJ. Switching the Z/E Selectivity in the Palladium(II)-Catalyzed Decarboxylative Heck Arylations of trans-Cinnamaldehydes by Solvent. Org Lett 2014; 16:6282-5. [DOI: 10.1021/ol502955r] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Shu-Rong Ban
- Department
of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada
- School
of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, People’s Republic of China
| | - Hai-Ning Wang
- Department
of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada
| | - Violeta Toader
- Department
of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada
| | - D. Scott Bohle
- Department
of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada
| | - Chao-Jun Li
- Department
of Chemistry, McGill University, Montreal, QC H3A 0B8, Canada
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43
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Bohle DS, Chua Z. Activation of Nitrogen Brønsted Acids: Synthesis and Reactivity of a New Class of Nitrogen Acid Complexes. Inorg Chem 2014; 53:11160-72. [DOI: 10.1021/ic5017033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- D. Scott Bohle
- Department
of Chemistry, McGill University, 801 Sherbrooke Street. W., Montreal, Quebec H3A 0B8, Canada
| | - Zhijie Chua
- Department
of Chemistry, McGill University, 801 Sherbrooke Street. W., Montreal, Quebec H3A 0B8, Canada
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44
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Abstract
1-(2-Nitrophenyl)-1-phenylamine and methyl 4-((2-nitrophenyl)amino)benzoate have been transformed into their corresponding urea derivatives through the action of chlorosulfonyl isocyanate. The initial sulfimidate product from the former reaction has sufficient stability so that it can be isolated and characterized as its disodium salt, and this, as well as three other subsequent products, have been characterized by X-ray diffraction. The corresponding intermediary urea was converted into its hydrazine derivative via a Hofmann rearrangement under oxidative conditions. Density functional theory has been used to examine the nature of the intermediates and transition states for the Hofmann rearrangement. There is little theoretical indication for a cyclic aziridinonium intermediate and the transition state between the urea and the isocyanate corresponds to a reactant-like rotation of the planar singlet nitrene before migration and formation of the new N−N bond.
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Affiliation(s)
- Cheryl D. Bain
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - Julia M. Bayne
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - D. Scott Bohle
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - Ian S. Butler
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
| | - Joël Poisson
- Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montréal, QC H3A 0B8, Canada
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45
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Fang Y, Salamé N, Woo S, Bohle DS, Friščić T, Cuccia LA. Rapid and facile solvent-free mechanosynthesis in a cell lysis mill: preparation and mechanochemical complexation of aminobenzoquinones. CrystEngComm 2014. [DOI: 10.1039/c4ce00328d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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46
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Garnier N, Redstone GGJ, Dahabieh MS, Nichol JN, del Rincon SV, Gu Y, Bohle DS, Sun Y, Conklin DS, Mann KK, Miller WH. The novel arsenical darinaparsin is transported by cystine importing systems. Mol Pharmacol 2014; 85:576-85. [PMID: 24431147 DOI: 10.1124/mol.113.089433] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Darinaparsin (Dar; ZIO-101; S-dimethylarsino-glutathione) is a promising novel organic arsenical currently undergoing clinical studies in various malignancies. Dar consists of dimethylarsenic conjugated to glutathione (GSH). Dar induces more intracellular arsenic accumulation and more cell death than the FDA-approved arsenic trioxide (ATO) in vitro, but exhibits less systemic toxicity. Here, we propose a mechanism for Dar import that might explain these characteristics. Structural analysis of Dar suggests a putative breakdown product: dimethylarsino-cysteine (DMAC). We show that DMAC is very similar to Dar in terms of intracellular accumulation of arsenic, cell cycle arrest, and cell death. We found that inhibition of γ-glutamyl-transpeptidase (γ-GT) protects human acute promyelocytic leukemia cells (NB4) from Dar, but not from DMAC, suggesting a role for γ-GT in the processing of Dar. Overall, our data support a model where Dar, a GSH S-conjugate, is processed at the cell surface by γ-GT, leading to formation of DMAC, which is imported via xCT, xAG, or potentially other cystine/cysteine importing systems. Further, we propose that Dar induces its own import via increased xCT expression. These mechanisms may explain the enhanced toxicity of Dar toward cancer cells compared with ATO.
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Affiliation(s)
- Nicolas Garnier
- Department of Oncology, Segal Cancer Center, Lady Davis Institute for Medical Research, Sir Mortimer B. Davis Jewish General Hospital, Division of Experimental Medicine (N.G., G.G.J.R., M.S.D., J.N.N., S.V.d.R., K.K.M., W.H.M.), and Department of Chemistry (Y.G., D.S.B.), McGill University, Montreal, Quebec, Canada; and Cancer Research Center, Department of Biomedical Sciences, University at Albany, State University of New York, Rensselaer, New York (Y.S., D.S.C.)
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47
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Abstract
A fluorescent structurally characterized chloroquine–metalloporphyrin adduct has been prepared and characterized. This allows for new insights into antimalarial drug–heme interactions.
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Affiliation(s)
- Erin L. Dodd
- Department of Chemistry
- McGill University
- Montreal, Canada
| | - D. Scott Bohle
- Department of Chemistry
- McGill University
- Montreal, Canada
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48
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Thawani N, Tam M, Bellemare MJ, Bohle DS, Olivier M, de Souza JB, Stevenson MM. Plasmodium products contribute to severe malarial anemia by inhibiting erythropoietin-induced proliferation of erythroid precursors. J Infect Dis 2013; 209:140-9. [PMID: 23922378 DOI: 10.1093/infdis/jit417] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Low reticulocytosis, indicating reduced red blood cell (RBC) output, is an important feature of severe malarial anemia. Evidence supports a role for Plasmodium products, especially hemozoin (Hz), in suppressed erythropoiesis during malaria, but the mechanism(s) involved remains unclear. Here, we demonstrated that low reticulocytosis and suppressed erythropoietin (Epo)-induced erythropoiesis are features of malarial anemia in Plasmodium yoelii- and Plasmodium berghei ANKA-infected mice, similar to our previous observations in Plasmodium chabaudi AS-infected mice. The magnitude of decreases in RBC was a reflection of parasitemia level, but low reticulocytosis was evident despite differences in parasitemia, clinical manifestation, and infection outcome. Schizont extracts and Hz from P. falciparum and P. yoelii and synthetic Hz suppressed Epo-induced proliferation of erythroid precursors in vitro but did not inhibit RBC maturation. To determine whether Hz contributes to malarial anemia, P. yoelii-derived or synthetic Hz was administered to naive mice, and the development of anemia, reticulocytosis, and RBC turnover was determined. Parasite-derived Hz induced significant decreases in RBC and increased RBC turnover with compensatory reticulocytosis, but anemia was not as severe as that in infected mice. Our findings suggest that parasite factors, including Hz, contribute to severe malarial anemia by suppressing Epo-induced proliferation of erythroid precursors.
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Affiliation(s)
- Neeta Thawani
- Research Institute of the McGill University Health Centre
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49
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Bohle DS, Chua Z, Perepichka I. Facile NN Activation in Benzotriazole: Capturing the Dimroth Azo/Triazole Intermediate by Complexation to Iridium. Chempluschem 2013; 78:1304-1310. [DOI: 10.1002/cplu.201300245] [Citation(s) in RCA: 6] [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] [Received: 03/26/2013] [Indexed: 11/06/2022]
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50
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Bohle DS, Chua Z, Perepichka I, Rosadiuk K. E/ZOxime Isomerism in PhC(NOH)CN. Chemistry 2013; 19:4223-9. [DOI: 10.1002/chem.201203357] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 12/28/2012] [Indexed: 11/06/2022]
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