1
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Alniss HY, Kemp BM, Holmes E, Hoffmann J, Ploch RM, Ramadan WS, Msallam YA, Al-Jubeh HM, Madkour MM, Celikkaya BC, Scott FJ, El-Awady R, Parkinson JA. Spectroscopic, biochemical and computational studies of bioactive DNA minor groove binders targeting 5'-WGWWCW-3' motif. Bioorg Chem 2024; 148:107414. [PMID: 38733748 DOI: 10.1016/j.bioorg.2024.107414] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 04/18/2024] [Accepted: 04/27/2024] [Indexed: 05/13/2024]
Abstract
Spectroscopic, biochemical, and computational modelling studies have been used to assess the binding capability of a set of minor groove binding (MGB) ligands against the self-complementary DNA sequences 5'-d(CGCACTAGTGCG)-3' and 5'-d(CGCAGTACTGCG)-3'. The ligands were carefully designed to target the DNA response element, 5'-WGWWCW-3', the binding site for several nuclear receptors. Basic 1D 1H NMR spectra of the DNA samples prepared with three MGB ligands show subtle variations suggestive of how each ligand associates with the double helical structure of both DNA sequences. The variations among the investigated ligands were reflected in the line shape and intensity of 1D 1H and 31P-{1H} NMR spectra. Rapid visual inspection of these 1D NMR spectra proves to be beneficial in providing valuable insights on MGB binding molecules. The NMR results were consistent with the findings from both UV DNA denaturation and molecular modelling studies. Both the NMR spectroscopic and computational analyses indicate that the investigated ligands bind to the minor grooves as antiparallel side-by-side dimers in a head-to-tail fashion. Moreover, comparisons with results from biochemical studies offered valuable insights into the mechanism of action, and antitumor activity of MGBs in relation to their structures, essential pre-requisites for future optimization of MGBs as therapeutic agents.
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Affiliation(s)
- Hasan Y Alniss
- College of Pharmacy, Department of Medicinal Chemistry, University of Sharjah, Sharjah 27272, United Arab Emirates; Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates.
| | - Bryony M Kemp
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Elizabeth Holmes
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Joanna Hoffmann
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Rafal M Ploch
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Wafaa S Ramadan
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Yousef A Msallam
- College of Pharmacy, Department of Medicinal Chemistry, University of Sharjah, Sharjah 27272, United Arab Emirates; Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Hadeel M Al-Jubeh
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Moustafa M Madkour
- College of Pharmacy, Department of Medicinal Chemistry, University of Sharjah, Sharjah 27272, United Arab Emirates; Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - Bekir C Celikkaya
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Fraser J Scott
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK
| | - Raafat El-Awady
- College of Pharmacy, Department of Medicinal Chemistry, University of Sharjah, Sharjah 27272, United Arab Emirates; Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah 27272, United Arab Emirates
| | - John A Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, UK.
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2
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Gould A, Lewis L, Evans L, Greening L, Howe-Davies H, West J, Roberts C, Parkinson JA. COVID-19 Personal Protective Behaviors during Large Social Events: The Value of Behavioral Observations. Behav Sci (Basel) 2024; 14:63. [PMID: 38247715 PMCID: PMC10813672 DOI: 10.3390/bs14010063] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2023] [Revised: 01/10/2024] [Accepted: 01/15/2024] [Indexed: 01/23/2024] Open
Abstract
Within the context of reopening society in the summer of 2021, as the UK moved away from 'lockdowns', the Government of Wales piloted the return of organized 'mass gatherings' of people at a number of test events. The current study reports behavioral observations that were made at two of the test events to inform this process. The researchers were particularly interested in four key factors: how (1) context within a venue, (2) environmental design, (3) staffing and social norms, and (4) time across an event, affected the personal protective behaviors of social distancing and face-covering use. Data collection was undertaken by trained observers. Adherence to protective behaviors was generally high, but there is clear evidence that these behaviors were shaped in a systematic way by the environment, situational cues, and the passage of time during the events. Some instances of large-scale non-adherence to personal protective behaviors were documented. An analysis within a dual-process framework suggests ways to understand and respond to supporting target health behaviors in groups of people where intervention is deemed valuable, such as in complex or ambiguous contexts. This is one of the first studies to include a 'true' behavioral measure in understanding human responses to COVID-19. It demonstrates that behavioral observations can add precision and granularity to understanding human behavior in complex real-world contexts. Given the significant physical and mental health burden created acutely and chronically by COVID-19, this work has implications for how governments and organizations support target populations in other complex challenges facing us today, such as in sustainability, and healthy lifestyle behaviors. An individual's intentions are not always matched by their actions, and so the findings support a balanced liberal paternalistic approach where system-level changes support appropriate individual-level decisions to engender collective responsibility and action.
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Affiliation(s)
| | | | | | - Leanne Greening
- School of Management, Swansea University, Swansea SA1 8EN, UK
| | | | | | | | - John A. Parkinson
- Wales Centre for Behaviour Change, Department of Psychology, Bangor University, Bangor LL57 2AS, UK
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3
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Hind C, Clifford M, Woolley C, Harmer J, McGee LMC, Tyson-Hirst I, Tait HJ, Brooke DP, Dancer SJ, Hunter IS, Suckling CJ, Beveridge R, Parkinson JA, Sutton JM, Scott FJ. Insights into the Spectrum of Activity and Mechanism of Action of MGB-BP-3. ACS Infect Dis 2022; 8:2552-2563. [PMID: 36444998 PMCID: PMC9745797 DOI: 10.1021/acsinfecdis.2c00445] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Indexed: 11/30/2022]
Abstract
MGB-BP-3 is a potential first-in-class antibiotic, a Strathclyde Minor Groove Binder (S-MGB), that has successfully completed Phase IIa clinical trials for the treatment of Clostridioides difficile associated disease. Its precise mechanism of action and the origin of limited activity against Gram-negative pathogens are relatively unknown. Herein, treatment with MGB-BP-3 alone significantly inhibited the bacterial growth of the Gram-positive, but not Gram-negative, bacteria as expected. Synergy assays revealed that inefficient intracellular accumulation, through both permeation and efflux, is the likely reason for lack of Gram-negative activity. MGB-BP-3 has strong interactions with its intracellular target, DNA, in both Gram-negative and Gram-positive bacteria, revealed through ultraviolet-visible (UV-vis) thermal melting and fluorescence intercalator displacement assays. MGB-BP-3 was confirmed to bind to dsDNA as a dimer using nano-electrospray ionization mass spectrometry and nuclear magnetic resonance (NMR) spectroscopy. Type II bacterial topoisomerase inhibition assays revealed that MGB-BP-3 was able to interfere with the supercoiling action of gyrase and the relaxation and decatenation actions of topoisomerase IV of both Staphylococcus aureus and Escherichia coli. However, no evidence of stabilization of the cleavage complexes was observed, such as for fluoroquinolones, confirmed by a lack of induction of DSBs and the SOS response in E. coli reporter strains. These results highlight additional mechanisms of action of MGB-BP-3, including interference of the action of type II bacterial topoisomerases. While MGB-BP-3's lack of Gram-negative activity was confirmed, and an understanding of this presented, the recognition that MGB-BP-3 can target DNA of Gram-negative organisms will enable further iterations of design to achieve a Gram-negative active S-MGB.
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Affiliation(s)
- Charlotte Hind
- Research
and Evaluation, UKHSA Porton Down, SalisburySP4 0JG, United Kingdom
| | - Melanie Clifford
- Research
and Evaluation, UKHSA Porton Down, SalisburySP4 0JG, United Kingdom
| | - Charlotte Woolley
- Research
and Evaluation, UKHSA Porton Down, SalisburySP4 0JG, United Kingdom
| | - Jane Harmer
- School
of Applied Sciences, University of Huddersfield, Queensgate, HuddersfieldHD1 3DH, United Kingdom
| | - Leah M. C. McGee
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - Izaak Tyson-Hirst
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - Henry J. Tait
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - Daniel P. Brooke
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - Stephanie J. Dancer
- Department
of Microbiology, Hairmyres Hospital, NHS Lanarkshire, GlasgowG75 8RG, United Kingdom
- School
of Applied Sciences, Edinburgh Napier University, EdinburghEH11 4BN, United Kingdom
| | - Iain S. Hunter
- Strathclyde
Institute of Pharmacy & Biomedical Sciences, University of Strathclyde, GlasgowG4 0RE, United
Kingdom
| | - Colin J. Suckling
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - Rebecca Beveridge
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - John A. Parkinson
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
| | - J. Mark Sutton
- Research
and Evaluation, UKHSA Porton Down, SalisburySP4 0JG, United Kingdom
- Institute
of Pharmaceutical Science, School of Cancer & Pharmaceutical Science, King’s College London, Franklin-Wilkins Building, 150 Stamford Street, LondonSE1 9NH, United Kingdom
| | - Fraser J. Scott
- Department
of Pure and Applied Chemistry, University
of Strathclyde, GlasgowG1 1XL, United
Kingdom
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4
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Dimitrova D, McMahon C, Kennedy AR, Parkinson JA, Leach SG, Boulton LT, Pascoe DD, Murphy JA. A study of the reactivity of cyclic aminomethylammonium mannich salts. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133120] [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: 11/06/2022]
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Willmot RA, Sharp RA, Amir Kassim A, Parkinson JA. A scoping review of community-based mental health intervention for children and adolescents in South Asia. Glob Ment Health (Camb) 2022; 10:e1. [PMID: 36843878 PMCID: PMC9947630 DOI: 10.1017/gmh.2022.49] [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] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 08/23/2022] [Indexed: 11/06/2022] Open
Abstract
Children and adolescents in South Asia are exposed to significant mental health risks. Yet, policy to prevent or treat youth mental health problems in this context is underdeveloped, and services are difficult to access. Community-based mental health treatment may offer a potential solution, by increasing resource capacity in deprived settings. However, little is known about the current community-based mental health provision for South Asian youth. A scoping review was conducted across six scientific databases and hand searching of reference lists to identify relevant studies. Study selection and data extraction were performed by three independent reviewers using predefined criteria, an adapted version of the template for intervention description and replication checklist and the Cochrane Risk of Bias Tool. The search identified 19 relevant studies published from January 2000 to March 2020. Studies most frequently addressed PTSD and autism, were conducted in India and Sri Lanka, used education-based intervention and were based in urban school settings. Community-based mental health provision for the South Asian youth is in its infancy, but holds promise for providing essential resources to treat or prevent mental health disorder. New insights on approaches are discussed, which are valuable for South Asian settings, primarily task-shifting and stigma reduction, with implications for policy, practice and research.
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Affiliation(s)
| | - Rebecca A. Sharp
- School of Human and Behavioural Sciences, Bangor University, Bangor, UK
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6
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Rauwolf P, Millard SK, Wong N, Witt A, Davies TJ, Cahill AM, Madden GJ, Parkinson JA, Rogers RD. "Just not knowing" can make life sweeter (and saltier): Reward uncertainty alters the sensory experience and consumption of palatable food and drinks. J Exp Psychol Gen 2021; 150:2015-2035. [PMID: 33734772 DOI: 10.1037/xge0001029] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Reward uncertainty can prompt exploration and learning, strengthening approach and consummatory behaviors. For humans, these phenomena are exploited in marketing promotions and gambling products, sometimes spurring hedonic consumption. Here, in four experiments, we sought to identify whether reward uncertainty-as a state of "not knowing" that exists between an action and a positively valanced outcome-enhances the in-the-moment consumption and experience of other palatable food and drink rewards. In Experiment 1, we demonstrate that reward uncertainty can increase consumption of commercial alcoholic drinks and energy-dense savory snacks. In Experiment 2, we show that reward uncertainty is unlikely to promote consumption through gross increases in impulsivity (expressed as higher discounting rates) or risk tolerance (expressed as lower probability discounting rates). In Experiment 3, we find that reward uncertainty intensifies the taste of, and hedonic responses to, sucrose solutions in a concentration-dependent manner among individuals with heightened preferences for sweet tastes. Finally, in Experiment 4, we replicate and extend these findings by showing that reward uncertainty intensifies the taste of palatable foods and drinks in ways that are independent of individuals' discounting rates, motor control, reflection impulsivity, and momentary happiness but are strongly moderated by recent depressive symptoms. These data suggest a working hypothesis that (incidental) reward uncertainty, as a state of not knowing, operates as a mood-dependent "taste intensifier" of palatable food and drink rewards, possibly sustaining reward seeking and consumption. (PsycInfo Database Record (c) 2021 APA, all rights reserved).
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7
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Honeyman GW, Armstrong DR, Clegg W, Hevia E, Kennedy AR, McLellan R, Orr SA, Parkinson JA, Ramsay DL, Robertson SD, Towie S, Mulvey RE. A regioselectively 1,1',3,3'-tetrazincated ferrocene complex displaying core and peripheral reactivity. Chem Sci 2020; 11:6510-6520. [PMID: 34094116 PMCID: PMC8152701 DOI: 10.1039/d0sc01612h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Regioselective 1,1',3,3'-tetrazincation [C-H to C-Zn(tBu)] of ferrocene has been achieved by reaction of a fourfold excess of di-t-butylzinc (tBu2Zn) with sodium 2,2,6,6-tetramethylpiperidide (NaTMP) in hexane solution manifested in the trimetallic iron-sodium-zinc complex [Na4(TMP)4Zn4(tBu)4{(C5H3)2Fe}], 1. X-ray crystallographic studies supported by DFT modelling reveal the structure to be an open inverse crown in which two [Na(TMP)Zn(tBu)Na(TMP)Zn(tBu)]2+ cationic units surround a {(C5H3)2Fe}4- tetraanion. Detailed C6D6 NMR studies have assigned the plethora of 1H and 13C chemical shifts of this complex. It exists in a major form in which capping and bridging TMP groups interchange, as well as a minor form that appears to be an intermediate in this complicated exchange phenomenon. Investigation of 1 has uncovered two distinct reactivities. Two of its peripheral t-butyl carbanions formally deprotonate toluene at the lateral methyl group to generate benzyl ligands that replace these carbanions in [Na4(TMP)4Zn4(tBu)2(CH2Ph)2{(C5H3)2Fe}], 2, which retains its tetrazincated ferrocenyl core. Benzyl-Na π-arene interactions are a notable feature of 2. In contrast, reaction with pyridine affords the crystalline product {[Na·4py][Zn(py*)2(tBu)·py]}∞, 3, where py is neutral pyridine (C5H5N) and py* is the anion (4-C5H4N), a rare example of pyridine deprotonated/metallated at the 4-position. This ferrocene-free complex appears to be a product of core reactivity in that the core-positioned ferrocenyl anions of 1, in company with TMP anions, have formally deprotonated the heterocycle.
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Affiliation(s)
- Gordon W Honeyman
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - David R Armstrong
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - William Clegg
- Chemistry, School of Natural and Environmental Sciences, Newcastle University Newcastle upon Tyne NE1 7RU UK
| | - Eva Hevia
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Alan R Kennedy
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Ross McLellan
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Samantha A Orr
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - John A Parkinson
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Donna L Ramsay
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Stuart D Robertson
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Stephen Towie
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
| | - Robert E Mulvey
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde Glasgow G1 1XL UK
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8
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Smith AJ, Dimitrova D, Arokianathar JN, Kolodziejczak K, Young A, Allison M, Poole DL, Leach SG, Parkinson JA, Tuttle T, Murphy JA. New reductive rearrangement of N-arylindoles triggered by the Grubbs-Stoltz reagent Et 3SiH/KO t Bu. Chem Sci 2020; 11:3719-3726. [PMID: 34094060 PMCID: PMC8152433 DOI: 10.1039/d0sc00361a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
N-Arylindoles are transformed into dihydroacridines in a new type of rearrangement, through heating with triethylsilane and potassium tert-butoxide. Studies indicate that the pathway involves (i) the formation of indole radical anions followed by fragmentation of the indole C2–N bond, and (ii) a ring-closing reaction that follows a potassium-ion dependent hydrogen atom transfer step. Unexpected behaviors of ‘radical-trap’ substrates prove very helpful in framing the proposed mechanism. N-Arylindoles are transformed into dihydroacridines in a new type of rearrangement, through heating with triethylsilane and potassium tert-butoxide.![]()
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Affiliation(s)
- Andrew J Smith
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Daniela Dimitrova
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Jude N Arokianathar
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Krystian Kolodziejczak
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Allan Young
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Mark Allison
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Darren L Poole
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road, Stevenage SG1 2NY UK
| | - Stuart G Leach
- GlaxoSmithKline Medicines Research Centre Gunnels Wood Road, Stevenage SG1 2NY UK
| | - John A Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - Tell Tuttle
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
| | - John A Murphy
- Department of Pure and Applied Chemistry, University of Strathclyde 295 Cathedral Street Glasgow G1 1XL UK
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9
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Chan AP, Parkinson JA, Rosair GM, Welch AJ. Bis(phosphine)hydridorhodacarborane Derivatives of 1,1′-Bis(ortho-carborane) and Their Catalysis of Alkene Isomerization and the Hydrosilylation of Acetophenone. Inorg Chem 2020; 59:2011-2023. [DOI: 10.1021/acs.inorgchem.9b03351] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Antony P.Y. Chan
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - John A. Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, United Kingdom
| | - Georgina M. Rosair
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Alan J. Welch
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
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10
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Alniss HY, Witzel II, Semreen MH, Panda PK, Mishra YK, Ahuja R, Parkinson JA. Investigation of the Factors That Dictate the Preferred Orientation of Lexitropsins in the Minor Groove of DNA. J Med Chem 2019; 62:10423-10440. [DOI: 10.1021/acs.jmedchem.9b01534] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Hasan Y. Alniss
- College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Ini-Isabée Witzel
- Core Technology Platform, New York University of Abu Dhabi, P.O. Box 129188, Saadiyat Island, Abu Dhabi, United Arab Emirates
| | - Mohammad H. Semreen
- College of Pharmacy, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
- Sharjah Institute for Medical Research, University of Sharjah, P.O. Box 27272, Sharjah, United Arab Emirates
| | - Pritam Kumar Panda
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala Sweden
| | - Yogendra Kumar Mishra
- Functional Nanomaterials, Institute for Materials Science, Kiel University, Kaiserstraße 2, D-24143 Kiel, Germany
| | - Rajeev Ahuja
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-75120, Uppsala Sweden
- Department of Materials and Engineering, Royal Institute of Technology (KTH), SE-10044 Stockholm Sweden
| | - John A. Parkinson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
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Alqarni AM, Dissanayake T, Nelson DJ, Parkinson JA, Dufton MJ, Ferro VA, Watson DG. Metabolomic Profiling of the Immune Stimulatory Effect of Eicosenoids on PMA-Differentiated THP-1 Cells. Vaccines (Basel) 2019; 7:vaccines7040142. [PMID: 31600945 PMCID: PMC6963534 DOI: 10.3390/vaccines7040142] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Revised: 09/26/2019] [Accepted: 09/27/2019] [Indexed: 12/19/2022] Open
Abstract
Honey bee venom has been established to have significant effect in immunotherapy. In the present study, (Z)-11-eicosenol-a major constituent of bee venom, along with its derivations methyl cis-11-eicosenoate and cis-11-eicosenoic acid, were synthesised to investigate their immune stimulatory effect and possible use as vaccine adjuvants. Stimuli that prime and activate the immune system have exerted profound effects on immune cells, particularly macrophages; however, the effectiveness of bee venom constituents as immune stimulants has not yet been established. Here, the abilities of these compounds to act as pro-inflammatory stimuli were assessed, either alone or in combination with lipopolysaccharide (LPS), by examining the secretion of tumour necrosis factor-α (TNF-α) and the cytokines interleukin-1β (IL-1β), IL-6 and IL-10 by THP-1 macrophages. The compounds clearly increased the levels of IL-1β and decreased IL-10, whereas a decrease in IL-6 levels suggested a complex mechanism of action. A more in-depth profile of macrophage behaviour was therefore obtained by comprehensive untargeted metabolic profiling of the cells using liquid chromatography mass spectrometry (LC-MS) to confirm the ability of the eicosanoids to trigger the immune system. The level of 358 polar and 315 non-polar metabolites were changed significantly (p < 0.05) by all treatments. The LPS-stimulated production of most of the inflammatory metabolite biomarkers in glycolysis, the tricarboxylic acid (TCA) cycle, the pentose phosphate pathway, purine, pyrimidine and fatty acids metabolism were significantly enhanced by all three compounds, and particularly by methyl cis-11-eicosenoate and cis-11-eicosenoic acid. These findings support the proposed actions of (Z)-11-eicosenol, methyl cis-11-eicosenoate and cis-11-eicosenoic acid as immune system stimulators.
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Affiliation(s)
- Abdulmalik M Alqarni
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
- Department of Pharmaceutical Chemistry, College of Clinical Pharmacy, Imam Abdulrahman Bin Faisal University (University of Dammam), Dammam 31441, Saudi Arabia.
| | - Tharushi Dissanayake
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - David J Nelson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - John A Parkinson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - Mark J Dufton
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - Valerie A Ferro
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - David G Watson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
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12
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Padroni G, Parkinson JA, Fox KR, Burley GA. Structural basis of DNA duplex distortion induced by thiazole-containing hairpin polyamides. Nucleic Acids Res 2019; 46:42-53. [PMID: 29194552 PMCID: PMC5758887 DOI: 10.1093/nar/gkx1211] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 11/28/2017] [Indexed: 01/05/2023] Open
Abstract
This manuscript reports the molecular basis for double-stranded DNA (dsDNA) binding of hairpin polyamides incorporating a 5-alkyl thiazole (Nt) unit. Hairpin polyamides containing an N-terminal Nt unit induce higher melting stabilisation of target dsDNA sequences relative to an archetypical hairpin polyamide incorporating an N-terminal imidazole (Im) unit. However, modification of the N-terminus from Im to Nt-building blocks results in an increase in dsDNA binding affinity but lower G-selectivity. A general G-selectivity trend is observed for Nt-containing polyamide analogues. G-selectivity increases as the steric bulk in the Nt 5-position increases. Solution-based NMR structural studies reveal differences in the modulation of the target DNA duplex of Nt-containing hairpin polyamides relative to the Im-containing archetype. A structural hallmark of an Nt polyamide•dsDNA complex is a more significant degree of major groove compression of the target dsDNA sequence relative to the Im-containing hairpin polyamide.
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Affiliation(s)
- Giacomo Padroni
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, UK
| | - John A Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, UK
| | - Keith R Fox
- Centre for Biological Sciences, University of Southampton, Life Sciences Building 85, Southampton SO17 1BJ, UK
| | - Glenn A Burley
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, UK
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13
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Padroni G, Withers JM, Taladriz-Sender A, Reichenbach LF, Parkinson JA, Burley GA. Sequence-Selective Minor Groove Recognition of a DNA Duplex Containing Synthetic Genetic Components. J Am Chem Soc 2019; 141:9555-9563. [DOI: 10.1021/jacs.8b12444] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [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)
- Giacomo Padroni
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Jamie M. Withers
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Andrea Taladriz-Sender
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Linus F. Reichenbach
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - John A. Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Glenn A. Burley
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
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14
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Aman K, Padroni G, Parkinson JA, Welte T, Burley GA. Structural and Kinetic Profiling of Allosteric Modulation of Duplex DNA Induced by DNA-Binding Polyamide Analogues. Chemistry 2019; 25:2757-2763. [PMID: 30407668 PMCID: PMC6468288 DOI: 10.1002/chem.201805338] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Indexed: 12/20/2022]
Abstract
A combined structural and quantitative biophysical profile of the DNA binding affinity, kinetics and sequence‐selectivity of hairpin polyamide analogues is described. DNA duplexes containing either target polyamide binding sites or mismatch sequences are immobilized on a microelectrode surface. Quantitation of the DNA binding profile of polyamides containing N‐terminal 1‐alkylimidazole (Im) units exhibit picomolar binding affinities for their target sequences, whereas 5‐alkylthiazole (Nt) units are an order of magnitude lower (low nanomolar). Comparative NMR structural analyses of the polyamide series shows that the steric bulk distal to the DNA‐binding face of the hairpin iPr‐Nt polyamide plays an influential role in the allosteric modulation of the overall DNA duplex structure. This combined kinetic and structural study provides a foundation to develop next‐generation hairpin designs where the DNA‐binding profile of polyamides is reconciled with their physicochemical properties.
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Affiliation(s)
- Khalid Aman
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Giacomo Padroni
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - John A Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1XL, UK
| | - Thomas Welte
- Dynamic Biosensors GmbH, 82152, Planegg, Germany
| | - Glenn A Burley
- Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow, G1 1XL, UK
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15
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Altwaijry N, Somani S, Parkinson JA, Tate RJ, Keating P, Warzecha M, Mackenzie GR, Leung HY, Dufès C. Regression of prostate tumors after intravenous administration of lactoferrin-bearing polypropylenimine dendriplexes encoding TNF-α, TRAIL, and interleukin-12. Drug Deliv 2018; 25:679-689. [PMID: 29493296 PMCID: PMC6058574 DOI: 10.1080/10717544.2018.1440666] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 02/04/2018] [Accepted: 02/11/2018] [Indexed: 12/22/2022] Open
Abstract
The possibility of using gene therapy for the treatment of prostate cancer is limited by the lack of intravenously administered delivery systems able to safely and selectively deliver therapeutic genes to tumors. Given that lactoferrin (Lf) receptors are overexpressed on prostate cancer cells, we hypothesized that the conjugation of Lf to generation 3-diaminobutyric polypropylenimine dendrimer would improve its transfection and therapeutic efficacy in prostate cancer cells. In this study, we demonstrated that the intravenous administration of Lf-bearing DAB dendriplexes encoding TNFα resulted in the complete suppression of 70% of PC-3 and 50% of DU145 tumors over one month. Treatment with DAB-Lf dendriplex encoding TRAIL led to tumor suppression of 40% of PC-3 tumors and 20% of DU145 tumors. The treatment was well tolerated by the animals. Lf-bearing generation 3-polypropylenimine dendrimer is therefore a highly promising delivery system for non-viral gene therapy of prostate cancer.
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Affiliation(s)
- Najla Altwaijry
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Sukrut Somani
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - John A. Parkinson
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, UK
| | - Rothwelle J. Tate
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Patricia Keating
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, UK
| | - Monika Warzecha
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | - Graeme R. Mackenzie
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
| | | | - Christine Dufès
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
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16
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Alqarni AM, Ferro VA, Parkinson JA, Dufton MJ, Watson DG. Effect of Melittin on Metabolomic Profile and Cytokine Production in PMA-Differentiated THP-1 Cells. Vaccines (Basel) 2018; 6:vaccines6040072. [PMID: 30322119 PMCID: PMC6313865 DOI: 10.3390/vaccines6040072] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [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: 09/11/2018] [Revised: 10/09/2018] [Accepted: 10/11/2018] [Indexed: 12/25/2022] Open
Abstract
Melittin, the major active peptide of honeybee venom (BV), has potential for use in adjuvant immunotherapy. The immune system response to different stimuli depends on the secretion of different metabolites from macrophages. One potent stimulus is lipopolysaccharide (LPS), a component isolated from gram-negative bacteria, which induces the secretion of pro-inflammatory cytokines in macrophage cell cultures. This secretion is amplified when LPS is combined with melittin. In the present study, pure melittin was isolated from whole BV by flash chromatography to obtain pure melittin. The ability of melittin to enhance the release of tumour necrosis factor-α (TNF-α), Interleukin (IL-1β, IL-6, and IL-10) cytokines from a macrophage cell line (THP-1) was then assessed. The response to melittin and LPS, applied alone or in combination, was characterised by metabolic profiling, and the metabolomics results were used to evaluate the potential of melittin as an immune adjuvant therapy. The addition of melittin enhanced the release of inflammatory cytokines induced by LPS. Effective chromatographic separation of metabolites was obtained by liquid chromatography-mass spectrometry (LC-MS) using a ZIC-pHILIC column and an ACE C4 column. The levels of 108 polar and non-polar metabolites were significantly changed (p ˂ 0.05) following cell activation by the combination of LPS and melittin when compared to untreated control cells. Overall, the findings of this study suggested that melittin might have a potential application as a vaccine adjuvant.
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Affiliation(s)
- Abdulmalik M Alqarni
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - Valerie A Ferro
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
| | - John A Parkinson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - Mark J Dufton
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - David G Watson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow G4 0RE, UK.
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Buchelnikov AS, Hernández Santiago AA, Starodub MA, Mosunov AA, Parkinson JA, Evstigneev MP. Generalized shape-independent approach to studying molecular hetero-assembly in solution using NMR diffusometry. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.05.106] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Dabos KJ, Nelson LJ, Hewage CH, Parkinson JA, Howie AF, Sadler IH, Hayes PC, Plevris JN. Comparison of Bioenergetic Activity of Primary Porcine Hepatocytes Cultured in Four Different Media. Cell Transplant 2017; 13:213-29. [PMID: 15191159 DOI: 10.3727/000000004783984007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Primary hepatocytes have extensively been used in biochemical, pharmacological, and physiological research. Recently, primary porcine hepatocytes have been regarded as the cells of choice for bioartificial liver support systems. The optimum culture medium for hepatocytes to be used in such devices has yet to be defined. In this study we investigated the effectiveness of four culture media in driving energy metabolism of primary porcine hepatocytes. The media selected were William's E medium, medium 1640, medium 199, and hepatocyte medium. Cells (3 × 1010; viability 87 ± 6%) were isolated from weanling piglets and seeded on 90-mm plates in the above media supplemented with antibiotics and hormones at a density of 8 × 106 viable cells per plate. Using 1H NMR spectroscopy we looked at indices of glycolysis, gluconeogenesis, ketogenesis, and ureagenesis on days 2, 4, and 6 of the experiments (n = 9). We also studied urea and albumin synthesis and total P450 content. The examined metabolic pathways of the hepatocytes were maintained by all media, although there were statistically significant differences between them. All media performed well in glycolysis, ureagenesis, and albumin synthesis. William's E medium and medium 199 outperformed the rest in gluconeogenesis. Medium 199 was best in ketogenesis. Overall, medium 199 was the best at driving energy metabolism from its constituent substrates and we think that it preferentially should be used in the culture of primary porcine hepatocytes.
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Affiliation(s)
- Konstantinos J Dabos
- Liver Cell Biology Laboratory, Department of Hepatology, University of Edinburgh, Edinburgh EH16 4SU, Scotland, UK.
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Alonezi S, Tusiimire J, Wallace J, Dufton MJ, Parkinson JA, Young LC, Clements CJ, Park JK, Jeon JW, Ferro VA, Watson DG. Metabolomic Profiling of the Synergistic Effects of Melittin in Combination with Cisplatin on Ovarian Cancer Cells. Metabolites 2017; 7:metabo7020014. [PMID: 28420117 PMCID: PMC5487985 DOI: 10.3390/metabo7020014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [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: 03/17/2017] [Revised: 04/10/2017] [Accepted: 04/12/2017] [Indexed: 12/13/2022] Open
Abstract
Melittin, the main peptide present in bee venom, has been proposed as having potential for anticancer therapy; the addition of melittin to cisplatin, a first line treatment for ovarian cancer, may increase the therapeutic response in cancer treatment via synergy, resulting in improved tolerability, reduced relapse, and decreased drug resistance. Thus, this study was designed to compare the metabolomic effects of melittin in combination with cisplatin in cisplatin-sensitive (A2780) and resistant (A2780CR) ovarian cancer cells. Liquid chromatography (LC) coupled with mass spectrometry (MS) was applied to identify metabolic changes in A2780 (combination treatment 5 μg/mL melittin + 2 μg/mL cisplatin) and A2780CR (combination treatment 2 μg/mL melittin + 10 μg/mL cisplatin) cells. Principal components analysis (PCA) and orthogonal partial least squares discriminant analysis (OPLS-DA) multivariate data analysis models were produced using SIMCA-P software. All models displayed good separation between experimental groups and high-quality goodness of fit (R2) and goodness of prediction (Q2), respectively. The combination treatment induced significant changes in both cell lines involving reduction in the levels of metabolites in the tricarboxylic acid (TCA) cycle, oxidative phosphorylation, purine and pyrimidine metabolism, and the arginine/proline pathway. The combination of melittin with cisplatin that targets these pathways had a synergistic effect. The melittin-cisplatin combination had a stronger effect on the A2780 cell line in comparison with the A2780CR cell line. The metabolic effects of melittin and cisplatin in combination were very different from those of each agent alone.
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Affiliation(s)
- Sanad Alonezi
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Jonans Tusiimire
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
- Department of Pharmacy, Faculty of Medicine, Mbarara University of Science and Technology, P.O. Box 1410 Mbarara, Uganda.
| | - Jennifer Wallace
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK.
| | - Mark J Dufton
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK.
| | - John A Parkinson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK.
| | - Louise C Young
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Carol J Clements
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Jin-Kyu Park
- #204, Beesen Co. Ltd., Bio Venture Town, Yuseong Daero 1662, Dae Jeon 34054, Korea.
| | - Jong-Woon Jeon
- #204, Beesen Co. Ltd., Bio Venture Town, Yuseong Daero 1662, Dae Jeon 34054, Korea.
| | - Valerie A Ferro
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - David G Watson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
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Gaca KZ, Parkinson JA, Sefcik J. Kinetics of early stages of resorcinol-formaldehyde polymerization investigated by solution-phase nuclear magnetic resonance spectroscopy. POLYMER 2017. [DOI: 10.1016/j.polymer.2016.12.069] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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21
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Mosunov AA, Pashkova IS, Sidorova M, Pronozin A, Lantushenko AO, Prylutskyy YI, Parkinson JA, Evstigneev MP. Determination of the equilibrium constant of C60 fullerene binding with drug molecules. Phys Chem Chem Phys 2017; 19:6777-6784. [DOI: 10.1039/c6cp07140f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
C60-Fullerene/drug association is described by an up-scaled model that allows the microscopic equilibrium association constant to be correctly determined.
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Affiliation(s)
- Andrei A. Mosunov
- Department of Physics
- Sevastopol State University
- Universitetskaya str
- 33
- 299053 Sevastopol
| | - Irina S. Pashkova
- Department of Physics
- Sevastopol State University
- Universitetskaya str
- 33
- 299053 Sevastopol
| | - Maria Sidorova
- Department of Physics
- Sevastopol State University
- Universitetskaya str
- 33
- 299053 Sevastopol
| | - Artem Pronozin
- Department of Physics
- Sevastopol State University
- Universitetskaya str
- 33
- 299053 Sevastopol
| | | | - Yuriy I. Prylutskyy
- Taras Shevchenko National University of Kyiv
- Volodymyrska Str
- 64
- 01601 Kyiv
- Ukraine
| | - John A. Parkinson
- WestCHEM Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow G1 1XL
- UK
| | - Maxim P. Evstigneev
- Department of Physics
- Sevastopol State University
- Universitetskaya str
- 33
- 299053 Sevastopol
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Carter PJ, Hore B, McGarrigle L, Edwards M, Doeg G, Oakes R, Campion A, Carey G, Vickers K, Parkinson JA. Happy thoughts: Enhancing well-being in the classroom with a positive events diary. The Journal of Positive Psychology 2016. [DOI: 10.1080/17439760.2016.1245770] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
| | - Brendan Hore
- School of Psychology, Bangor University, Bangor, UK
| | | | | | - Gavin Doeg
- Wirral Educational Psychology Team, Birkenhead, UK
| | - Rachel Oakes
- School of Psychology, Bangor University, Bangor, UK
| | | | - Grace Carey
- School of Psychology, Bangor University, Bangor, UK
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23
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Alonezi S, Tusiimire J, Wallace J, Dufton MJ, Parkinson JA, Young LC, Clements CJ, Park JK, Jeon JW, Ferro VA, Watson DG. Metabolomic Profiling of the Effects of Melittin on Cisplatin Resistant and Cisplatin Sensitive Ovarian Cancer Cells Using Mass Spectrometry and Biolog Microarray Technology. Metabolites 2016; 6:metabo6040035. [PMID: 27754384 PMCID: PMC5192441 DOI: 10.3390/metabo6040035] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [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: 09/07/2016] [Revised: 10/10/2016] [Accepted: 10/11/2016] [Indexed: 12/30/2022] Open
Abstract
In the present study, liquid chromatography-mass spectrometry (LC-MS) was employed to characterise the metabolic profiles of two human ovarian cancer cell lines A2780 (cisplatin-sensitive) and A2780CR (cisplatin-resistant) in response to their exposure to melittin, a cytotoxic peptide from bee venom. In addition, the metabolomics data were supported by application of Biolog microarray technology to examine the utilisation of carbon sources by the two cell lines. Data extraction with MZmine 2.14 and database searching were applied to provide metabolite lists. Principal component analysis (PCA) gave clear separation between the cisplatin-sensitive and resistant strains and their respective controls. The cisplatin-resistant cells were slightly more sensitive to melittin than the sensitive cells with IC50 values of 4.5 and 6.8 μg/mL respectively, although the latter cell line exhibited the greatest metabolic perturbation upon treatment. The changes induced by melittin in the cisplatin-sensitive cells led mostly to reduced levels of amino acids in the proline/glutamine/arginine pathway, as well as to decreased levels of carnitines, polyamines, adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide (NAD+). The effects on energy metabolism were supported by the data from the Biolog assays. The lipid compositions of the two cell lines were quite different with the A2780 cells having higher levels of several ether lipids than the A2780CR cells. Melittin also had some effect on the lipid composition of the cells. Overall, this study suggests that melittin might have some potential as an adjuvant therapy in cancer treatment.
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Affiliation(s)
- Sanad Alonezi
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Jonans Tusiimire
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Jennifer Wallace
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - Mark J Dufton
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - John A Parkinson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
| | - Louise C Young
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Carol J Clements
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - Jin Kyu Park
- Beesen Co. Ltd., Bio Venture Town, Yuseong Daero 1662, Dae Jeon 34054, Korea.
| | - Jong Woon Jeon
- Beesen Co. Ltd., Bio Venture Town, Yuseong Daero 1662, Dae Jeon 34054, Korea.
| | - Valerie A Ferro
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
| | - David G Watson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK.
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24
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25
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Fuentes MÁ, Kennedy AR, Mulvey RE, Parkinson JA, Rantanen T, Robertson SD, Snieckus V. Adding a Structural Context to the Deprotometalation and Trans-Metal Trapping Chemistry of Phenyl-Substituted Benzotriazole. Chemistry 2015; 21:14812-22. [DOI: 10.1002/chem.201502534] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Indexed: 11/06/2022]
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McKenna JM, Parkinson JA. HOBS methods for enhancing resolution and sensitivity in small DNA oligonucleotide NMR studies. Magn Reson Chem 2015; 53:249-255. [PMID: 25353689 DOI: 10.1002/mrc.4182] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 07/07/2014] [Revised: 09/30/2014] [Accepted: 10/13/2014] [Indexed: 06/04/2023]
Abstract
(1) H NMR spectra from biopolymers give chemical shifts classified according to proton type and often suffer from signal degeneracy. Data from nucleic acids are particularly prone to this failing. Recent developments in proton broadband decoupling techniques with the promise of enhanced resolution at full sensitivity have allowed us to investigate the application of homonuclear band-selective (HOBS) decoupling to the study of small synthetic DNA molecules and to compare these with results from classical and pure shift techniques. Improved signal resolution at full sensitivity in both HOBS-1D (1) H and HOBS-2D [(1) H, (1) H] NOESY NMR data is reported for three example small DNA molecules. Comparisons of (1) H T1 and integrals of signals from HOBS-1D (1) H and HOBS-2D [(1) H, (1) H] NOESY NMR data with those of standard data collection methods are also reported. The results show that homonuclear HOBS-NOESY data are useful for data assignment purposes and have some merit for quantification purposes. In general, we show that resolution and sensitivity enhancement of (1) H NMR data for small DNA samples may be achieved without recourse to higher magnetic field strength at full sensitivity in a band-selected manner.
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Affiliation(s)
- Josiah M McKenna
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK
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27
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Hernandez Santiago AA, Buchelnikov AS, Rubinson MA, Yesylevskyy SO, Parkinson JA, Evstigneev MP. Shape-independent model (SHIM) approach for studying aggregation by NMR diffusometry. J Chem Phys 2015; 142:104202. [DOI: 10.1063/1.4913974] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Adrian A. Hernandez Santiago
- Department of Physics and Mathematics, Faculty of Chemistry, Autonomous University of Puebla, Puebla CP 72570, Mexico
| | | | - Maria A. Rubinson
- Department of Physics, Sevastopol State University, Universitetskaya str.33, Sevastopol 299053, Ukraine
| | - Semen O. Yesylevskyy
- Department of Physics of Biological Systems, Institute of Physics of the National Academy of Sciences of Ukraine, Prospect Nauky 46, Kiev-28 03680, Ukraine
| | - John A. Parkinson
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Maxim P. Evstigneev
- Department of Biology and Chemistry, Belgorod State University, Belgorod 308015, Russia
- Department of Physics, Sevastopol State University, Universitetskaya str.33, Sevastopol 299053, Ukraine
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28
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Brown JA, Cochrane AR, Irvine S, Kerr WJ, Mondal B, Parkinson JA, Paterson LC, Reid M, Tuttle T, Andersson S, Nilsson GN. Inside Cover: The Synthesis of Highly Active Iridium(I) Complexes and their Application in Catalytic Hydrogen Isotope Exchange (Adv. Synth. Catal. 17/2014). Adv Synth Catal 2014. [DOI: 10.1002/adsc.201401054] [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: 11/10/2022]
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29
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Brown JA, Cochrane AR, Irvine S, Kerr WJ, Mondal B, Parkinson JA, Paterson LC, Reid M, Tuttle T, Andersson S, Nilsson GN. The Synthesis of Highly Active Iridium(I) Complexes and their Application in Catalytic Hydrogen Isotope Exchange. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400730] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Abstract
We investigated whether appearance motive for sun exposure, which strongly predicts exposure behaviour, would predict reactions to safe sun messages. In a survey with an embedded experiment, 245 individuals completed measures of motives, read a safe sun message framed by incentive (appearance/health), tone (directive/nondirective) and valence (gain/loss), then completed measures of reactions. For participants high in appearance motive, an appearance-nondirective message was most persuasive. Regardless of individual's appearance motive, appearance messages produced lower reactance if phrased using nondirective language. To maximise persuasion and minimise reactance in individuals most motivated to sun expose, safe sun messages should focus on appearance using nondirective language.
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Affiliation(s)
- Trefor Aspden
- a School of Psychology, Bangor University , Bangor , UK
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31
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Alniss HY, Salvia MV, Sadikov M, Golovchenko I, Anthony NG, Khalaf AI, MacKay SP, Suckling CJ, Parkinson JA. Recognition of the DNA minor groove by thiazotropsin analogues. Chembiochem 2014; 15:1978-90. [PMID: 25045155 DOI: 10.1002/cbic.201402202] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [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: 04/29/2014] [Indexed: 01/14/2023]
Abstract
Solution-phase self-association characteristics and DNA molecular-recognition properties are reported for three close analogues of minor-groove-binding ligands from the thiazotropsin class of lexitropsin molecules; they incorporate isopropyl thiazole as a lipophilic building block. Thiazotropsin B (AcImPy(iPr) ThDp) shows similar self-assembly characteristics to thiazotropsin A (FoPyPy(iPr) ThDp), although it is engineered, by incorporation of imidazole in place of N-methyl pyrrole, to swap its DNA recognition target from 5'-ACTAGT-3' to 5'-ACGCGT-3'. Replacement of the formamide head group in thiazotropsin A by nicotinamide in AIK-18/51 results in a measureable difference in solution-phase self-assembly character and substantially enhanced DNA association characteristics. The structures and associated thermodynamic parameters of self-assembled ligand aggregates and their complexes with their respective DNA targets are considered in the context of cluster targeting of DNA by minor-groove complexes.
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Affiliation(s)
- Hasan Y Alniss
- Department of Pharmacy, An-Najah National University, University Street, Nablus (Palestine); Present address: Leslie Dan Faculty of Pharmacy, University of Toronto, Toronto, Ontario M5S 2J7 (Canada)
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32
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Gaca KZ, Parkinson JA, Lue L, Sefcik J. Equilibrium Speciation in Moderately Concentrated Formaldehyde–Methanol–Water Solutions Investigated Using 13C and 1H Nuclear Magnetic Resonance Spectroscopy. Ind Eng Chem Res 2014. [DOI: 10.1021/ie403252x] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [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)
- Katarzyna Z. Gaca
- Department
of Chemical and Process Engineering, University of Strathclyde, 75 Montrose
Street, G1 1XJ Glasgow, United Kingdom
- Department
of Chemistry and Technology of Polymers, Cracow University of Technology, ul. Warszawska 24, 31-155 Cracow, Poland
| | - John A. Parkinson
- WESTCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL Glasgow, United Kingdom
| | - Leo Lue
- Department
of Chemical and Process Engineering, University of Strathclyde, 75 Montrose
Street, G1 1XJ Glasgow, United Kingdom
| | - Jan Sefcik
- Department
of Chemical and Process Engineering, University of Strathclyde, 75 Montrose
Street, G1 1XJ Glasgow, United Kingdom
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33
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Rawling MJ, Rowley JH, Campbell M, Kennedy AR, Parkinson JA, Tomkinson NCO. Mechanistic insights into the malonoyl peroxide syn-dihydroxylation of alkenes. Chem Sci 2014. [DOI: 10.1039/c3sc53256a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
A detailed mechanistic understanding of the malonoyl peroxide mediated dihydroxylation of alkenes is presented.
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Affiliation(s)
- Michael J. Rawling
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow, UK
| | - Julian H. Rowley
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow, UK
| | | | - Alan R. Kennedy
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow, UK
| | - John A. Parkinson
- WestCHEM
- Department of Pure and Applied Chemistry
- University of Strathclyde
- Glasgow, UK
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34
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Laurenson JAB, Parkinson JA, Percy JM, Rinaudo G, Roig R. Multigramme synthesis and asymmetric dihydroxylation of a 4-fluorobut-2E-enoate. Beilstein J Org Chem 2013; 9:2660-8. [PMID: 24367430 PMCID: PMC3869297 DOI: 10.3762/bjoc.9.301] [Citation(s) in RCA: 2] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Accepted: 11/08/2013] [Indexed: 11/29/2022] Open
Abstract
Esters of crotonic acid were brominated on a multigramme scale using a free radical procedure. A phase transfer catalysed fluorination transformed these species to the 4-fluorobut-2E-enoates reproducibly and at scale (48–53%, ca. 300 mmol). Asymmetric dihydroxylation reactions were then used to transform the butenoate, ultimately into all four diastereoisomers of a versatile fluorinated C4 building block at high enantiomeric-enrichment. The (DHQ)2AQN and (DHQD)2AQN ligands described by Sharpless were the most effective. The development and optimisation of a new and facile method for the determination of ee is also described; 19F{1H} spectra recorded in d-chloroform/diisopropyl tartrate showed distinct baseline separated signals for different enantiomers.
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Affiliation(s)
- James A B Laurenson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom ; Carbosynth Ltd., 93 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, United Kingdom
| | - John A Parkinson
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Jonathan M Percy
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Giuseppe Rinaudo
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, Thomas Graham Building, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Ricard Roig
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom ; Lallemand Gb Ingredients, Dock Road, Felixstowe, Suffolk IP11 3QW, United Kingdom
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35
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Bogacki R, Gill DM, Kerr WJ, Lamont S, Parkinson JA, Paterson LC. Flexible access to conformationally-locked bicyclic morpholines. Chem Commun (Camb) 2013; 49:8931-3. [PMID: 23963244 DOI: 10.1039/c3cc45627g] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A preparatively accessible route to a series of conformationally-locked bicyclic morpholines has been developed. This flexible approach allows for diversification in order for a small array of lead-like scaffolds to be synthesised from readily available key building blocks.
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Affiliation(s)
- Rachael Bogacki
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, Scotland, UK.
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36
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Zou J, Parkinson JA, Sadler PJ. Gold(III)-Induced Oxidation of Amino Acids and Malonic Acid: Reaction Pathways Studied by NMR Spectroscopy with Isotope Labelling. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200200078] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Gaca KZ, Parkinson JA, Sefcik J. Molecular Speciation and Mesoscale Clustering in Formaldehyde–Methanol–Water Solutions in the Presence of Sodium Carbonate. J Phys Chem B 2013; 117:10548-55. [DOI: 10.1021/jp405731g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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)
- Katarzyna Z. Gaca
- Department
of Chemical and Process Engineering, University of Strathclyde, 75 Montrose
Street, G1 1XJ Glasgow, United Kingdom
| | - John A. Parkinson
- WESTCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, G1 1XL Glasgow, United Kingdom
| | - Jan Sefcik
- Department
of Chemical and Process Engineering, University of Strathclyde, 75 Montrose
Street, G1 1XJ Glasgow, United Kingdom
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38
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Prylutskyy YI, Buchelnikov AS, Voronin DP, Kostjukov VV, Ritter U, Parkinson JA, Evstigneev MP. C60 fullerene aggregation in aqueous solution. Phys Chem Chem Phys 2013; 15:9351-60. [PMID: 23660696 DOI: 10.1039/c3cp50187f] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In the present work we develop a novel approach for quantification of the energetics of C60 fullerene aggregation in aqueous media in terms of equilibrium aggregation constant KF. In particular, it is shown that the experimental determination of the magnitude of KF is possible only within the framework of the 'up-scaled aggregation model', considering the C60 fullerene water solution as a solution of fullerene clusters. Using dynamic light scattering (DLS) data we report the value, K(F) = 56,000 M(-1), which is in good agreement with existing theoretical estimates and the results of energetic analyses. It is suggested that the proposed 'up-scaled model' may be used in any instances of non-specific aggregation resulting in formation of large spherical particles. The measurement of the translational diffusion coefficient and the dimensions of the light scattering particles using a DLS approach with respect to C60 fullerene aggregates is found to contain significant systematic errors originating from the interaction effect that is well-known for micellar solutions. As a result, corrections to the equations associated with DLS data are proposed.
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Affiliation(s)
- Yuriy I Prylutskyy
- ESC Institute of Biology, Taras Shevchenko National University of Kyiv, Kyiv 01601, Ukraine
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39
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Salvia MV, Addison F, Alniss HY, Buurma NJ, Khalaf AI, Mackay SP, Anthony NG, Suckling CJ, Evstigneev MP, Santiago AH, Waigh RD, Parkinson JA. Thiazotropsin aggregation and its relationship to molecular recognition in the DNA minor groove. Biophys Chem 2013; 179:1-11. [PMID: 23714424 DOI: 10.1016/j.bpc.2013.04.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [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: 03/27/2013] [Revised: 04/19/2013] [Accepted: 04/19/2013] [Indexed: 11/29/2022]
Abstract
Aggregated states have been alluded to for many DNA minor groove binders but details of the molecule-on-molecule relationship have either been under-reported or ignored. Here we report our findings from ITC and NMR measurements carried out with AIK-18/51, a compound representative of the thiazotropsin class of DNA minor groove binders. The free aqueous form of AIK-18/51 is compared with that found in its complex with cognate DNA duplex d(CGACTAGTCG)2. Molecular self-association of AIK-18/51 is consistent with anti-parallel, face-to-face dimer formation, the building block on which the molecule aggregates. This underlying structure is closely allied to the form found in the ligand's DNA complex. NMR chemical shift and diffusion measurements yield a self-association constant Kass=(61±19)×10(3)M(-1) for AIK-18/51 that fits with a stepwise self-assembly model and is consistent with ITC data. The deconstructed energetics of this assembly process are reported with respect to a design strategy for ligand/DNA recognition.
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Affiliation(s)
- Marie-Virginie Salvia
- WestCHEM Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
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Affiliation(s)
- Muhammed Alzweiri
- a Department of Pharmaceutical Sciences , The University of Jordan , Amman , Jordan
| | - David G. Watson
- b Strathclyde Institute for Pharmaceutical and Biomedical Sciences , University of Strathclyde , Glasgow , U.K
| | - John A. Parkinson
- c WestCHEM, Department of Pure and Applied Chemistry , University of Strathclyde , Glasgow , U.K
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41
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Saßmannshausen J, Klett J, Kennedy AR, Parkinson JA, Armstrong D. Taming the shrew: [TMEDALi-Zn(C2H4)2L] as a model compound for anionic ethene polymerisation. NEW J CHEM 2013. [DOI: 10.1039/c2nj40874k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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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42
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Parkinson JA, Scott FJ, Suckling CJ, Wilson G. Exceptionally strong intermolecular association in hydrophobic DNA minor groove binders and their potential therapeutic consequences. Med Chem Commun 2013. [DOI: 10.1039/c3md00071k] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Mills A, Hazafy D, Parkinson JA, Tuttle T, Hutchings MG. Comment on "Solvent effect on the electronic spectra of azine dyes under alkaline condition". J Phys Chem A 2012; 113:9575-6; author reply 9577. [PMID: 23057085 DOI: 10.1021/jp9030927] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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44
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Lawrence NS, Hinton EC, Parkinson JA, Lawrence AD. Nucleus accumbens response to food cues predicts subsequent snack consumption in women and increased body mass index in those with reduced self-control. Neuroimage 2012; 63:415-22. [PMID: 22776461 DOI: 10.1016/j.neuroimage.2012.06.070] [Citation(s) in RCA: 183] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 06/28/2012] [Accepted: 06/30/2012] [Indexed: 01/01/2023] Open
Abstract
Individuals have difficulty controlling their food consumption, which is due in part to the ubiquity of tempting food cues in the environment. Individual differences in the propensity to attribute incentive (motivational) salience to and act on these cues may explain why some individuals eat more than others. Using fMRI in healthy women, we found that food cue related activity in the nucleus accumbens, a key brain region for food motivation and reward, was related to subsequent snack food consumption. However, both nucleus accumbens activation and snack food consumption were unrelated to self-reported hunger, or explicit wanting and liking for the snack. In contrast, food cue reactivity in the ventromedial prefrontal cortex was associated with subjective hunger/appetite, but not with consumption. Whilst the food cue reactivity in the nucleus accumbens that predicted snack consumption was not directly related to body mass index (BMI), it was associated with increased BMI in individuals reporting low self-control. Our findings reveal a neural substrate underpinning automatic environmental influences on consumption in humans and demonstrate how self-control interacts with this response to predict BMI. Our data provide support for theoretical models that advocate a 'dual hit' of increased incentive salience attribution to food cues and poor self-control in determining vulnerability to overeating and overweight.
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Affiliation(s)
- Natalia S Lawrence
- School of Psychology, Cardiff University, Park Place, Cardiff CF10 3AT, UK.
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45
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Kostjukov VV, Santiago AAH, Rodriguez FR, Castilla SR, Parkinson JA, Evstigneev MP. Energetics of ligand binding to the DNA minor groove. Phys Chem Chem Phys 2012; 14:5588-600. [DOI: 10.1039/c2cp40182g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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46
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Jolly PI, Zhou S, Thomson DW, Garnier J, Parkinson JA, Tuttle T, Murphy JA. Imidazole-derived carbenes and their elusive tetraazafulvalene dimers. Chem Sci 2012. [DOI: 10.1039/c2sc20054f] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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47
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Armstrong DR, Kennedy AR, Mulvey RE, Parkinson JA, Robertson SD. Opening the black box of mixed-metal TMP metallating reagents: direct cadmation or lithium–cadmium transmetallation? Chem Sci 2012. [DOI: 10.1039/c2sc20392h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
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48
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Alniss HY, Anthony NG, Khalaf AI, Mackay SP, Suckling CJ, Waigh RD, Wheate NJ, Parkinson JA. Rationalising sequence selection by ligand assemblies in the DNA minor groove: the case for thiazotropsin A. Chem Sci 2012. [DOI: 10.1039/c2sc00630h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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49
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Nelson DJ, Ashworth IW, Hillier IH, Kyne SH, Pandian S, Parkinson JA, Percy JM, Rinaudo G, Vincent MA. Why is RCM Favoured Over Dimerisation? Predicting and Estimating Thermodynamic Effective Molarities by Solution Experiments and Electronic Structure Calculations. Chemistry 2011; 17:13087-94. [DOI: 10.1002/chem.201101662] [Citation(s) in RCA: 25] [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: 05/31/2011] [Revised: 08/11/2011] [Indexed: 11/09/2022]
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50
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García-Álvarez P, Mulvey RE, Parkinson JA. “LiZn(TMP)3”, a Zincate or a Turbo-Lithium Amide Reagent? DOSY NMR Spectroscopic Evidence. Angew Chem Int Ed Engl 2011; 50:9668-71. [DOI: 10.1002/anie.201104297] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Indexed: 11/06/2022]
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