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Pavković N, Milovanović B, Stanojević A, Etinski M, Petković M. Proton leap: shuttling of protons onto benzonitrile. Phys Chem Chem Phys 2022; 24:3958-3969. [PMID: 35099492 DOI: 10.1039/d1cp04338b] [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: 11/21/2022]
Abstract
The detailed description of chemical transformations in the interstellar medium allows deciphering the origin of a number of small and medium - sized organic molecules. We present density functional theory analysis of proton transfer from the trihydrogen cation and the ethenium cation to benzonitrile, a recently discovered species in the Taurus Molecular Cloud 1. Detailed energy transformations along the reaction paths were analyzed using the interacting quantum atoms methodology, which elucidated how the proton carrier influences the lightness to deliver the proton to benzonitrile's nitrogen atom. The proton carriers' deformation energy represents the largest destabilizing effect, whereas a proton's promotion energy, the benzonitrile-proton Coulomb attraction, as well as non-classical benzonitrile-proton and carrier-proton interaction are the dominant stabilizing energy components. As two ion-molecule reactions proceed without energy barriers, rate constants were estimated using the classical capture theory and were found to be an order of magnitude larger for the reaction with the trihydrogen cation compared to that with the ethenium cation (∼10-8 and 10-9 cm3 s-1, respectively). These results were obtained both with quantum chemical and ab initio molecular dynamics simulations (the latter performed at 10 K and 100 K), confirming that up to 100 K both systems choose energetically undemanding routes by tracking the corresponding minimum energy paths. A concept of a turning point is introduced, which is an equivalent to the transition state in barrierless reactions.
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Affiliation(s)
- Nemanja Pavković
- University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia.
| | - Branislav Milovanović
- University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia.
| | - Ana Stanojević
- University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia.
| | - Mihajlo Etinski
- University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia.
| | - Milena Petković
- University of Belgrade - Faculty of Physical Chemistry, Studentski trg 12-16, 11158 Belgrade, Serbia.
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Stanojević A, Milovanović B, Stanković I, Etinski M, Petković M. The significance of the metal cation in guanine-quartet – metalloporphyrin complexes. Phys Chem Chem Phys 2021; 23:574-584. [DOI: 10.1039/d0cp05798c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The distinct positions of the divalent metal ions with respect to the porphyrin ring are responsible for different interaction energies between metalloporphyrins and the guanine quartet.
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Affiliation(s)
- Ana Stanojević
- University of Belgrade – Faculty of Physical Chemistry
- 11 158 Belgrade
- Serbia
| | | | - Ivana Stanković
- Institute of Chemistry
- Technology and Metallurgy
- 11 000 Belgrade
- Serbia
| | - Mihajlo Etinski
- University of Belgrade – Faculty of Physical Chemistry
- 11 158 Belgrade
- Serbia
| | - Milena Petković
- University of Belgrade – Faculty of Physical Chemistry
- 11 158 Belgrade
- Serbia
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Milovanović B, Stanojević A, Etinski M, Petković M. Intriguing Intermolecular Interplay in Guanine Quartet Complexes with Alkali and Alkaline Earth Cations. J Phys Chem B 2020; 124:3002-3014. [DOI: 10.1021/acs.jpcb.0c01165] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Branislav Milovanović
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Ana Stanojević
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Mihajlo Etinski
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Milena Petković
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
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Stanojević A, Marković VM, Čupić Ž, Kolar-Anić L, Vukojević V. Advances in mathematical modelling of the hypothalamic–pituitary–adrenal (HPA) axis dynamics and the neuroendocrine response to stress. Curr Opin Chem Eng 2018. [DOI: 10.1016/j.coche.2018.04.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Stanojević A, Marković VM, Čupić Ž, Vukojević V, Kolar-Anić L. Modelling of the Hypothalamic-Pituitary-Adrenal Axis Perturbations by Externally Induced Cholesterol Pulses of Finite Duration and with Asymmetrically Distributed Concentration Profile. Russ J Phys Chem 2018. [DOI: 10.1134/s0036024417130027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Stanojević A, Marković VM, Maćešić S, Kolar-Anić L, Vukojević V. Kinetic modelling of testosterone-related differences in the hypothalamic–pituitary–adrenal axis response to stress. Reac Kinet Mech Cat 2017. [DOI: 10.1007/s11144-017-1315-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Čupić Ž, Stanojević A, Marković VM, Kolar-Anić L, Terenius L, Vukojević V. The HPA axis and ethanol: a synthesis of mathematical modelling and experimental observations. Addict Biol 2017; 22:1486-1500. [PMID: 27189379 DOI: 10.1111/adb.12409] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 08/23/2015] [Revised: 03/24/2016] [Accepted: 04/11/2016] [Indexed: 12/21/2022]
Abstract
Stress and alcohol use are interrelated-stress contributes to the initiation and upholding of alcohol use and alcohol use alters the way we perceive and respond to stress. Intricate mechanisms through which ethanol alters the organism's response to stress remain elusive. We have developed a stoichiometric network model to succinctly describe neurochemical transformations underlying the stress response axis and use numerical simulations to model ethanol effects on complex daily changes of blood levels of cholesterol, 6 peptide and 8 steroid hormones. Modelling suggests that ethanol alters the dynamical regulation of hypothalamic-pituitary-adrenal (HPA) axis activity by affecting the amplitude of ultradian oscillations of HPA axis hormones, which defines the threshold with respect to which the response to stress is being set. These effects are complex-low/moderate acute ethanol challenge (<8 mM) may reduce, leave unaltered or increase the amplitude of ultradian cortisol (CORT) oscillations, giving rise to an intricate response at the organism level, offering also a potential explanation as to why apparently discordant results were observed in experimental studies. In contrast, high-dose acute ethanol challenge (>8 mM) increases instantaneous CORT levels and the amplitude of ultradian CORT oscillations in a dose-dependent manner, affecting the HPA axis activity also during the following day(s). Chronic exposure to ethanol qualitatively changes the HPA axis dynamics, whereas ethanol at intoxicating levels shuts down this dynamic regulation mechanism. Mathematical modelling gives a quantitative biology-based framework that can be used for predicting how the integral HPA axis response is perturbed by alcohol.
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Affiliation(s)
- Željko Čupić
- Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering; University of Belgrade; Belgrade Serbia
| | - Ana Stanojević
- Faculty of Physical Chemistry; University of Belgrade; Belgrade Serbia
| | | | - Ljiljana Kolar-Anić
- Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering; University of Belgrade; Belgrade Serbia
- Faculty of Physical Chemistry; University of Belgrade; Belgrade Serbia
| | - Lars Terenius
- Department of Clinical Neuroscience, Center for Molecular Medicine; Karolinska Institutet; Stockholm Sweden
| | - Vladana Vukojević
- Department of Clinical Neuroscience, Center for Molecular Medicine; Karolinska Institutet; Stockholm Sweden
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Abulseoud OA, Ho MC, Choi DS, Stanojević A, Čupić Ž, Kolar-Anić L, Vukojević V. Corticosterone oscillations during mania induction in the lateral hypothalamic kindled rat-Experimental observations and mathematical modeling. PLoS One 2017; 12:e0177551. [PMID: 28542167 PMCID: PMC5436765 DOI: 10.1371/journal.pone.0177551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 04/28/2017] [Indexed: 01/03/2023] Open
Abstract
Changes in the hypothalamic-pituitary-adrenal (HPA) axis activity constitute a key component of bipolar mania, but the extent and nature of these alterations are not fully understood. We use here the lateral hypothalamic-kindled (LHK) rat model to deliberately induce an acute manic-like episode and measure serum corticosterone concentrations to assess changes in HPA axis activity. A mathematical model is developed to succinctly describe the entwined biochemical transformations that underlay the HPA axis and emulate by numerical simulations the considerable increase in serum corticosterone concentration induced by LHK. Synergistic combination of the LHK rat model and dynamical systems theory allows us to quantitatively characterize changes in HPA axis activity under controlled induction of acute manic-like states and provides a framework to study in silico how the dynamic integration of neurochemical transformations underlying the HPA axis is disrupted in these states.
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Affiliation(s)
- Osama A. Abulseoud
- Department of Psychiatry and Psychology; Mayo Clinic, Rochester, Minnesota, United States of America
- Chemistry and Drug Metabolism, IRP, National Institute on Drug Abuse, National Institutes of Health, Baltimore, Maryland, United States of America
| | - Man Choi Ho
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Doo-Sup Choi
- Department of Psychiatry and Psychology; Mayo Clinic, Rochester, Minnesota, United States of America
- Department of Molecular Pharmacology & Experimental Therapeutics, Mayo Clinic, Rochester, Minnesota, United States of America
| | - Ana Stanojević
- University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12–16, Belgrade, Serbia
| | - Željko Čupić
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Serbia
| | - Ljiljana Kolar-Anić
- University of Belgrade, Faculty of Physical Chemistry, Studentski trg 12–16, Belgrade, Serbia
- University of Belgrade, Institute of Chemistry, Technology and Metallurgy, Department of Catalysis and Chemical Engineering, Njegoševa 12, Belgrade, Serbia
| | - Vladana Vukojević
- Karolinska Institute, Department of Clinical Neuroscience, Center for Molecular Medicine CMM L8:01, Stockholm, Sweden
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Čupić Ž, Marković VM, Maćešić S, Stanojević A, Damjanović S, Vukojević V, Kolar-Anić L. Dynamic transitions in a model of the hypothalamic-pituitary-adrenal axis. Chaos 2016; 26:033111. [PMID: 27036189 DOI: 10.1063/1.4944040] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Dynamic properties of a nonlinear five-dimensional stoichiometric model of the hypothalamic-pituitary-adrenal (HPA) axis were systematically investigated. Conditions under which qualitative transitions between dynamic states occur are determined by independently varying the rate constants of all reactions that constitute the model. Bifurcation types were further characterized using continuation algorithms and scale factor methods. Regions of bistability and transitions through supercritical Andronov-Hopf and saddle loop bifurcations were identified. Dynamic state analysis predicts that the HPA axis operates under basal (healthy) physiological conditions close to an Andronov-Hopf bifurcation. Dynamic properties of the stress-control axis have not been characterized experimentally, but modelling suggests that the proximity to a supercritical Andronov-Hopf bifurcation can give the HPA axis both, flexibility to respond to external stimuli and adjust to new conditions and stability, i.e., the capacity to return to the original dynamic state afterwards, which is essential for maintaining homeostasis. The analysis presented here reflects the properties of a low-dimensional model that succinctly describes neurochemical transformations underlying the HPA axis. However, the model accounts correctly for a number of experimentally observed properties of the stress-response axis. We therefore regard that the presented analysis is meaningful, showing how in silico investigations can be used to guide the experimentalists in understanding how the HPA axis activity changes under chronic disease and/or specific pharmacological manipulations.
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Affiliation(s)
- Željko Čupić
- Department of Catalysis and Chemical Engineering, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
| | - Vladimir M Marković
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Stevan Maćešić
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Ana Stanojević
- Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Svetozar Damjanović
- Institute of Endocrinology, Diabetes and Metabolic Diseases, School of Medicine, University of Belgrade, Dr Subotica 13, 11000 Belgrade, Serbia
| | - Vladana Vukojević
- Department of Clinical Neuroscience, Karolinska Institutet, CMM L8:01, 17176 Stockholm, Sweden
| | - Ljiljana Kolar-Anić
- Department of Catalysis and Chemical Engineering, Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Njegoševa 12, 11000 Belgrade, Serbia
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Marković VM, Čupić Ž, Maćešić S, Stanojević A, Vukojević V, Kolar-Anić L. Modelling cholesterol effects on the dynamics of the hypothalamic–pituitary–adrenal (HPA) axis. Math Med Biol 2014; 33:1-28. [DOI: 10.1093/imammb/dqu020] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2013] [Accepted: 09/09/2014] [Indexed: 02/04/2023]
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Antonijević B, Stanojević A, Zivković-Lesić L. [Clinical characteristics of patients with Lyme disease treated at the Institute for Infective and Tropical Diseases 1988-1992]. Glas Srp Akad Nauka Med 1993:133-139. [PMID: 8262398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In the Institute for infectious and tropical diseases in Belgrade in the period 1988-1992, 680 patients with Lyme borreliosis have been examined. In most cases illness was recognised in the first stage as Erythema migrans. In seven patients second and third stage of Lyme borreliosis was cured in hospital.
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Stanojević A, Pavlović M, Brmbolić B, Prazić A. [Imported malaria--clinical problems]. SRP ARK CELOK LEK 1991; 119:87-90. [PMID: 1796334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Over the period from 1985 to 1989, 107 patients suffering from malaria were treated in the Institute for Infectious and Tropical Diseases in Belgrade. The eradication of malaria in Yugoslavia was carried out in 1960 and all the new cases originated from different African countries. Most of these patients were Yugoslav citizens working in these countries. Plasmodium falciparum was the cause of malaria in most of them. The parasytologic analysis of dense drops and smears of peripheric blood revealed it in 81 (75.5%) patients. Taking into account the great problem of treatment of malaria resistant to Resorchin (over 50% in our patients) the great role of chemioprophylaxix, antimalaric agents and appropriate vaccination is emphasized.
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