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Peluffo RD, del V. Alonso S, Itri R, Flecha FLG, Barbosa L. LAFeBS, alive, kicking, and growing: the story continues…. Biophys Rev 2024; 16:401-402. [PMID: 39309125 PMCID: PMC11415323 DOI: 10.1007/s12551-024-01208-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 07/02/2024] [Indexed: 09/25/2024] Open
Abstract
This Commentary describes a call for contributions to an upcoming Special Issue (SI) of Biophysical Reviews on the Latin American Federation of Biophysical Societies (LAFeBS). It details the reason for the SI, the SI Editors' contact information, and the relevant submission details for those wishing to contribute a review manuscript.
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Affiliation(s)
- R. Daniel Peluffo
- Group of Biophysical Chemistry, Department of Biological Sciences, CENUR Litoral Norte, Universidad de La República, Salto, Uruguay
| | - Silvia del V. Alonso
- Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Laboratorio de Bio-Nanotecnología, Bernal, Buenos Aires Argentina
- Grupo de Biología Estructural y Biotecnología (GBEyB), IMBICE (CONICET CCT-La Plata), Buenos Aires, Argentina
| | - Rosangela Itri
- Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP 05508-090 Brazil
| | - F. Luis González Flecha
- Laboratorio de Biofísica Molecular, Universidad de Buenos Aires - CONICET, Instituto de Química y Fisicoquímica Biológicas, Buenos Aires, Argentina
| | - Leandro Barbosa
- Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP 05508-090 Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP Brazil
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Sánchez AG, Ibargoyen MN, Mastrogiovanni M, Radi R, Keszenman DJ, Peluffo RD. Fast and biphasic 8-nitroguanine production from guanine and peroxynitrite. Free Radic Biol Med 2022; 193:474-484. [PMID: 36332879 DOI: 10.1016/j.freeradbiomed.2022.10.317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Revised: 10/12/2022] [Accepted: 10/28/2022] [Indexed: 11/06/2022]
Abstract
Guanine (Gua), among purines, is a preferred oxidation/nitration target because of its low one-electron redox potential. The reactive oxygen/nitrogen species peroxynitrite (ONOO-), produced in vivo by the reaction between nitric oxide (•NO) and superoxide radical (O2•‒), is responsible for several oxidative modifications in biomolecules, including nitration, nitrosation, oxidation, and peroxidation. In particular, the nitration of Gua, although detected, as well as its reaction kinetics have been seldom investigated. Thus, we studied the concentration- and temperature-dependent formation of 8-nitroguanine (8-NitroGua) in phosphate buffer (pH 7.40) using stopped-flow spectrophotometry. Traces showed a biexponential behavior, with best-fit rate constants: kfast = 4.4 s-1 and kslow = 0.41 s-1 (30 °C, 400 μM both Gua and ONOO-). kfast increased linearly with the concentration of both reactants whereas kslow was concentration-independent. Linear regression analysis of kfast as a function of Gua and ONOO- concentration yielded values of 2.5-6.3 × 103 M-1s-1 and 1.5-3.5 s-1 for the second-order (slope) and first-order (ordinate) rate constants, respectively (30 °C). Since ONOO- is a short-lived species, its decay kinetics was also taken into account for this analysis. The 8-NitroGua product was stable for at least 4 h, so no spontaneous denitration was observed. Stopped-flow assays using antioxidants and free-radical scavengers suggested a mixed direct/indirect reaction mechanism for 8-NitroGua formation. Gua nitration by ONOO- was also observed in the presence of physiologically relevant CO2 concentrations. The reaction product identity, its yield (∼4.2%, with 400 μM ONOO- and 200 μM Gua), and the reaction mechanism were unequivocally determined by HPLC-MS/MS experiments. In conclusion, 8-NitroGua production at physiologic pH reached significant levels in a few hundred milliseconds, suggesting that the process might be kinetically relevant in vivo and can likely cause permanent nitrative damage to DNA bases.
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Affiliation(s)
- Ana G Sánchez
- Grupo de Biofisicoquímica, Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Rivera 1350, 50000, Salto, Uruguay
| | - M Natalia Ibargoyen
- Grupo de Biofisicoquímica, Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Rivera 1350, 50000, Salto, Uruguay
| | - Mauricio Mastrogiovanni
- Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Avda. General Flores 2125, 11800, Montevideo, Uruguay
| | - Rafael Radi
- Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Avda. General Flores 2125, 11800, Montevideo, Uruguay
| | - Deborah J Keszenman
- Grupo de Biofisicoquímica, Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Rivera 1350, 50000, Salto, Uruguay
| | - R Daniel Peluffo
- Grupo de Biofisicoquímica, Departamento de Ciencias Biológicas, CENUR Litoral Norte, Universidad de la República, Rivera 1350, 50000, Salto, Uruguay; Centro de Investigaciones Biomédicas (CEINBIO), Facultad de Medicina, Universidad de la República, Avda. General Flores 2125, 11800, Montevideo, Uruguay; Department of Pharmacology, Physiology and Neuroscience, Rutgers Biomedical and Health Sciences, New Jersey Medical School, Rutgers, The State University of New Jersey, 185 South Orange Avenue, Newark, NJ, 07103, USA.
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Peluffo RD, del V. Alonso S, Itri R, Flecha FLG, Barbosa LRS. Biophysical Reviews special issue call: LAFeBS-highlighting biophysics in Latin America. Biophys Rev 2022; 14:1083-1084. [PMID: 36345275 PMCID: PMC9636340 DOI: 10.1007/s12551-022-00996-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/01/2022] [Indexed: 10/14/2022] Open
Abstract
This Commentary describes a call for contributions to an upcoming Special Issue (SI) of Biophysical Reviews on the Latin American Federation of Biophysical Societies (LAFeBS). It details the reason for the SI, the SI Editors contact information and the relevant submission details for those wishing to contribute.
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Affiliation(s)
- R. Daniel Peluffo
- Group of Biophysical Chemistry, Department of Biological Sciences, CENUR Litoral Norte, Universidad de la República, Salto, Uruguay
| | - Silvia del V. Alonso
- Departamento de Ciencia y Tecnología, Laboratorio de Bio-Nanotecnología, Universidad Nacional de Quilmes, Bernal, Buenos Aires Argentina
- Grupo de Biología Estructural y Biotecnología (GBEyB), IMBICE (CONICET CCT-La Plata), Buenos Aires, Argentina
| | - Rosangela Itri
- Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP 05508-090 Brazil
| | - F. Luis González Flecha
- Laboratorio de Biofísica Molecular, Instituto de Química y Fisicoquímica Biológicas, Universidad de Buenos Aires - CONICET, Buenos Aires, Argentina
| | - Leandro R. S. Barbosa
- Instituto de Fisica, Universidade de Sao Paulo, Sao Paulo, SP 05508-090 Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, SP Brazil
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Molecular Mechanisms behind Safranal's Toxicity to HepG2 Cells from Dual Omics. Antioxidants (Basel) 2022; 11:antiox11061125. [PMID: 35740022 PMCID: PMC9219844 DOI: 10.3390/antiox11061125] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 05/28/2022] [Accepted: 05/30/2022] [Indexed: 02/06/2023] Open
Abstract
The spice saffron (Crocus sativus) has anticancer activity in several human tissues, but the molecular mechanisms underlying its potential therapeutic effects are poorly understood. We investigated the impact of safranal, a small molecule secondary metabolite from saffron, on the HCC cell line HepG2 using untargeted metabolomics (HPLC–MS) and transcriptomics (RNAseq). Increases in glutathione disulfide and other biomarkers for oxidative damage contrasted with lower levels of the antioxidants biliverdin IX (139-fold decrease, p = 5.3 × 105), the ubiquinol precursor 3-4-dihydroxy-5-all-trans-decaprenylbenzoate (3-fold decrease, p = 1.9 × 10−5), and resolvin E1 (−3282-fold decrease, p = 45), which indicates sensitization to reactive oxygen species. We observed a significant increase in intracellular hypoxanthine (538-fold increase, p = 7.7 × 10−6) that may be primarily responsible for oxidative damage in HCC after safranal treatment. The accumulation of free fatty acids and other biomarkers, such as S-methyl-5′-thioadenosine, are consistent with safranal-induced mitochondrial de-uncoupling and explains the sharp increase in hypoxanthine we observed. Overall, the dual omics datasets describe routes to widespread protein destabilization and DNA damage from safranal-induced oxidative stress in HCC cells.
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Abstract
The current issue (volume 13 issue 6, 2021) is a Special Issue jointly dedicated to scientific content presented at the 20th triennial IUPAB Congress that was held in conjunction with both the 45th Annual Meeting of the Brazilian Biophysical Society (Sociedade Brasileira de Biofísica - SBBf) and the 50th Annual Meeting of the Brazilian Society for Biochemistry and Molecular Biology (Sociedade Brasileira de Bioquímica e Biologia Molecular - SBBq). In addition to describing the scientific and nonscientific content arising from the meeting this sub-editorial also provides a look back at some of the high points for Biophysical Reviews in the year 2021 before going on to describe a number of matters of interest to readers of the journal in relation to the coming year of 2022.
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Affiliation(s)
- Damien Hall
- WPI Nano Life Science Institute, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa 920-1164 Japan
- Department of Applied Physics, Aalto University, FI-00076 Aalto, Finland
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