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Ítem Acceso Abierto 2-Mercaptomethyl-thiazolidines use conserved aromatic–S interactions to achieve broad-range inhibition of metallo-β-lactamases(Royal Society of Chemistry, 2021-01-05) Rossi, María Agustina; Martínez, Verónica; Hinchliffe, Philip; Mojica, María F.; Castillo, Valerie; Moreno, Diego M.; Smith, Ryan; Spellberg, Brad; Drusano, George L.; Banchio, Claudia; Bonomo, Robert A.; Spencer, James; Vila, Alejandro J.; Mahler, Graciela; https://orcid.org/0000-0003-4720-4070; https://orcid.org/0000-0002-3697-5219; https://orcid.org/0000-0001-8611-4743; https://orcid.org/0000-0002-1380-9824; https://orcid.org/0000-0001-5493-8537; https://orcid.org/0000-0002-4602-0571; https://orcid.org/0000-0002-7978-3233; https://orcid.org/0000-0003-0612-0516Infections caused by multidrug resistant (MDR) bacteria are a major public health threat. Carbapenems are among the most potent antimicrobial agents that are commercially available to treat MDR bacteria. Bacterial production of carbapenem-hydrolysing metallo-β-lactamases (MBLs) challenges their safety and efficacy, with subclass B1 MBLs hydrolysing almost all β-lactam antibiotics. MBL inhibitors would fulfil an urgent clinical need by prolonging the lifetime of these life-saving drugs. Here we report the synthesis and activity of a series of 2-mercaptomethyl-thiazolidines (MMTZs), designed to replicate MBL interactions with reaction intermediates or hydrolysis products. MMTZs are potent competitive inhibitors of B1 MBLs in vitro (e.g., Ki = 0.44 μM vs. NDM-1). Crystal structures of MMTZ complexes reveal similar binding patterns to the most clinically important B1 MBLs (NDM-1, VIM-2 and IMP-1), contrasting with previously studied thiol-based MBL inhibitors, such as bisthiazolidines (BTZs) or captopril stereoisomers, which exhibit lower, more variable potencies and multiple binding modes. MMTZ binding involves thiol coordination to the Zn(II) site and extensive hydrophobic interactions, burying the inhibitor more deeply within the active site than D/L-captopril. Unexpectedly, MMTZ binding features a thioether–π interaction with a conserved active-site aromatic residue, consistent with their equipotent inhibition and similar binding to multiple MBLs. MMTZs penetrate multiple Enterobacterales, inhibit NDM-1 in situ, and restore carbapenem potency against clinical isolates expressing B1 MBLs. Based on their inhibitory profile and lack of eukaryotic cell toxicity, MMTZs represent a promising scaffold for MBL inhibitor development. These results also suggest sulphur–π interactions can be exploited for general ligand design in medicinal chemistry.Ítem Acceso Abierto A disordered region retains the full protease inhibitor activity and the capacity to induce CD8+ T cells in vivo of the oral vaccine adjuvant U-Omp19(Elsevier, 2022-09-06) Darriba, María Laura; Pueblas Castro, Celeste; Coria, Lorena M.; Bruno, Laura; Cerutti, María Laura; Otero, Lisandro H.; Chemes, Lucía B.; Rasia, Rodolfo M.; Klinke, Sebastián; Cassataro, Juliana; Pasquevich, Karina A.Ítem Acceso Abierto A general reaction mechanism for carbapenem hydrolysis by mononuclear and binuclear metallo-β-lactamases(Nature, 2017-09-14) Lisa, María Natalia; Palacios, Antonela R.; Aitha, Mahesh; González, Mariano M.; Moreno, Diego M.; Crowder, Michael W.; Bonomo, Robert A.; Spencer, James; Tierney, David L.; Llarrull, Leticia Irene; Vila, Alejandro J.Ítem Acceso Abierto A new model for Trypanosoma cruzi heme homeostasis depends on modulation of TcHTE protein expression(American Society for Biochemistry and Molecular Biology, 2020-07-23) Pagura, Lucas; Tevere, Evelyn; Merli, Marcelo Luciano; Cricco, Julia AlejandraÍtem Acceso Abierto Acinetobacter baumannii response to cefiderocol challenge in human urine(Springer Nature, 2022-05-24) Nishimura, Brent; Escalante, Jenny; Tuttobene, Marisel Romina; Subils, Tomás; Mezcord, Vyanka; Pimentel, Camila; Georgeos, Nardin; Pasteran, Fernando; Rodríguez, Cecilia; Sieira, Rodrigo; Actis, Luis A.; Tolmasky, Marcelo E.; Bonomo, Robert A.; Ramírez, María SoledadCefiderocol (CFDC) is a novel chlorocatechol-substituted siderophore antibiotic approved to treat complicated urinary tract infections (cUTI) and hospital-acquired and ventilator-acquired pneumonia (HAP/VAP). Previous work determined that albumin-rich human fluids increase the minimum inhibitory concentration (MICs) of Acinetobacter baumannii against CFDC and reduce the expression of genes related to iron uptake systems. This latter effect may contribute to the need for higher concentrations of CFDC to inhibit growth. The presence of human urine (HU), which contains low albumin concentrations, did not modify MIC values of two carbapenem-resistant A. baumannii. Levels of resistance to CFDC were not modified by HU in strain AMA40 but were reduced in strain AB5075. Expanding the studies to other carbapenem-resistant A. baumannii isolates showed that the presence of HU resulted in unmodified or reduced MIC of CDFC values. The expression of piuA, pirA, bauA, and bfnH determined by qRT-PCR was enhanced in A. baumannii AMA40 and AB5075 by the presence of HU in the culture medium. All four tested genes code for functions related to recognition and transport of ferric-siderophore complexes. The effect of HU on expression of pbp1, pbp3, blaOXA-51-like, blaADC, and blaNDM-1, genes associated with resistance to β-lactams, as well as genes coding for efflux pumps and porins was variable, showing dependence with the strain analyzed. We conclude that the lack of significant concentrations of albumin and free iron in HU makes this fluid behave differently from others we tested. Unlike other albumin rich fluids, the presence of HU does not impact the antibacterial activity of CFDC when tested against A. baumannii.Ítem Acceso Abierto Acute diarrhoea in children: determination of duration using a combined bismuth hydroxide gel and oral rehydration solution therapy vs. oral rehydration solution(MDPI, 2016-12-21) Oviedo, Adriana; Díaz, Mirna; Valenzuela, María Laura; Vidal, Victoria; Racca, Liliana; Bottai, Hebe; Priore, Graciela; Peluffo, Graciela; Di Bartolomeo, Susana; Cabral, Graciela; Toca, María del CarmenOral rehydration salt (ORS) treatment in young children with acute diarrhoea (AD) has contributed to decrease mortality associated with dehydration although effective strategies to reduce morbidity associated with this disease are required. The aim of this study was to evaluate the diarrhoea duration when using combined colloidal bismuth hydroxide gel (CBHG) and oral rehydration salt treatment compared with ORS therapy in children with AD. We designed a double-blind, randomised prospective study with treatment and control groups. Patients aged one to 12 years, with no prior pathology and with AD of less than 48 h were included. The Chi-squared and Mann-Whitney tests were used, as well as the Cox proportional hazards model and the Kaplan-Meier estimator. Patients were randomised into an ORS and CBHG treatment group and a control group for ORS plus placebo. (Average age: 3.2 years). The result of the post-treatment evaluation with respect to the average duration of AD was 25.5 h for the treated group vs. 41.5 h for the control group (p = 0.015). The average number of stools was 4.8 in the treated group and 8.2 in the control group (p = 0.032). We conclude that the use of CBHG plus ORS significantly reduced the duration of AD, the number of stools and the percentage of children with persistent AD after 24 h of treatment compared to the control group. AD remitted almost twice as fast in patients treated with CBHG and ORS compared to those who received ORS plus placebo.Ítem Acceso Abierto An experiment-informed signal transduction model for the role of the Staphylococcus aureus MecR1 protein in β-lactam resistance(Springer Nature, 2019-12-20) Belluzo, Bruno Salvador; Abriata, Luciano Andrés; Giannini, Estefanía; Mihovilcevic, Damila; Dal Peraro, Matteo; Llarrull, Leticia IreneThe treatment of hospital- and community-associated infections by methicillin-resistant Staphylococcus aureus (MRSA) is a perpetual challenge. This Gram-positive bacterium is resistant specifically to β-lactam antibiotics, and generally to many other antibacterial agents. Its resistance mechanisms to β-lactam antibiotics are activated only when the bacterium encounters a β-lactam. This activation is regulated by the transmembrane sensor/signal transducer proteins BlaR1 and MecR1. Neither the transmembrane/metalloprotease domain, nor the complete MecR1 and BlaR1 proteins, are isolatable for mechanistic study. Here we propose a model for full-length MecR1 based on homology modeling, residue coevolution data, a new extensive experimental mapping of transmembrane topology, partial structures, molecular simulations, and available NMR data. Our model defines the metalloprotease domain as a hydrophilic transmembrane chamber effectively sealed by the apo-sensor domain. It proposes that the amphipathic helices inserted into the gluzincin domain constitute the route for transmission of the β-lactam-binding event in the extracellular sensor domain, to the intracellular and membrane-embedded zinc-containing active site. From here, we discuss possible routes for subsequent activation of proteolytic action. This study provides the first coherent model of the structure of MecR1, opening routes for future functional investigations on how β-lactam binding culminates in the proteolytic degradation of MecI.Ítem Acceso Abierto Análisis de biomarcadores urinarios en la nefropatía lúpica activa(Sociedad Argentina de Nefrología, 2015-09-18) Monje, Adriana L.; Balbi, Bárbara; Pezzarini, Eleonora; Pelusa, H. Fabián; Basiglio, Cecilia Lorena; Daniele, Stella; Rossi, María; Rodenas, Martín; Sarano, Héctor; Bottai, Hebe; Arriaga, Sandra Mónica María; Sociedad Argentina de NefrologíaIntroducción: La lipocalina asociada a la gelatinasa de neutrófilo (NGAL) tiene un efecto protector sobre los túbulos renales por lo cual se la propuso como un biomarcador para la nefropatía lúpica activa (NLA). Por otro lado se encontró un aumento significativo de la transferrina urinaria (Tf) en pacientes con NL asociada a la recaída renal. La β2 microglobulina (β2MG) atraviesa la membrana glomerular y es reabsorbida y degradada en el túbulo proximal. La disfunción tubular asociada al proceso inflamatorio inmune y a la proteinuria glomerular produce elevaciones en su concentración urinaria. Objetivo: Evaluar los niveles urinarios de NGAL, Tf y β2MG en pacientes con NL activa (NLA) y cuál de estos parámetros bioquímicos exhibe mayor correlación con la actividad de la enfermedad. Material, métodos y resultados: Se trabajó con pacientes del Servicio de Nefrología del Hospital Provincial del Centenario con diagnóstico de NLA (n=9) y como grupo control pacientes con NL no activa (NLNA; n=22). Los biomarcadores urinarios se determinaron en orina aislada por EIA de origen comercial y se expresaron en relación a la creatinina urinaria (método cinético). Los resultados obtenidos (media±DE) para NGAL (ng/gCr), Tf (ng/gCr) y β2MG (μg/gCr) fueron respectivamente: NLA: 190±147, 564±553 y 38±48; NLNA: 100±72, 878±548 y 39±64. Solamente se encontraron diferencias estadísticamente significativas para NGAL entre ambos grupos (p<0,05). Además, se observó una asociación levemente significativa entre NGAL y Tf para el grupo NLA (r=0,6; p=0,0897). Conclusión: En la muestra analizada, de los tres biomarcadores estudiados, NGAL sería el mejor indicador de actividad renal en el lupus. La correlación positiva entre NGAL y Tf obtenida en el grupo con NLA sugiere la presencia de un daño glomérulotubular en estos pacientes, el cual no se vio corroborado por la β2MG.Ítem Acceso Abierto Análisis de factores genéticos de riesgo asociados al estrés oxidativo en miocardiopatía chagásica crónica(2015-08) Diviani, Romina; Lioi, Susana; Gerrard, Gabriela; Ceruti, María José; Beloscar, Juan; D'Arrigo, Mabel; Colegio de Bioquímicos de la Provincia de Santa Fe 1a. CircunscripciónINTRODUCCIÓN: Diferentes estudios sugieren que el huésped podría responder al estrés oxidativo inducido por el Trypanosoma cruzi (Tc), mediante la activación de la defensa antioxidante. En la Miocardiopatía Chagásica Crónica (MCC), la inflamación progresiva podría modificar el estado antioxidante celular. Enzimas involucradas en el estrés oxidativo controlarían la generación de especies reactivas del oxígeno.Ítem Acceso Abierto Análisis del perfil de citocinas en pacientes con complicaciones del embarazo : estudio preliminar(Asociación Bioquímica Argentina, 2015-06-14) Pezzarini, Eleonora; Balbi, Bárbara; Trucco Boggione, Carolina; Cotorruelo, Carlos; Bottai, Hebe; Pezzotto, Stella; Daniele, Stella; Arriaga, Sandra Mónica María; Pelusa, H. Fabián; Asociación Bioquímica ArgentinaLa hipertensión gestacional (HG), es una de las entidades obstétricas más frecuentes y, tal vez, la que más repercusión desfavorable ejerce sobre el producto de la concepción y a su vez sobre la madre. La preeclampsia (PE) es una enfermedad multisistémica, de causa desconocida y es una de las principales causas de morbimortalidad materna y perinatal. El hecho de que el sistema inmunitario materno permita la implantación de un embrión sin complicaciones representa una manifestación de tolerancia inmunológica. Se postula que para un desarrollo trofoblástico normal, sería necesaria una expresión de citocinas del tipo Th2. En cambio, si el perfil predominante fuera el Th1, existiría una hostilidad inmunológica hacia el trofoblasto, que traería como consecuencia una disminución del flujo sanguíneo a la unidad feto-placentaria, isquemia y finalmente necrosis. El objetivo del trabajo fue analizar la expresión de citocinas en mujeres con trastornos del embarazo tales como la HG y la PE y analizar la correlación entre estas citocinas y la presencia de las patologías mencionadas. Para ello se trabajó con un grupo de pacientes con diagnóstico de HG (n=6), de PE (n=3) y como grupo control (GC) se incluyeron embarazadas sin patologías asociadas (n=10). Todas provenían del Servicio de Ginecología y Obstetricia del Hospital Provincial del Centenario y firmaron el consentimiento informado. Se excluyeron aquellas pacientes que presentaban hipertensión arterial primaria, evidencias clínico-bioquímicas de hipertensión secundaria, diabetes, insuficiencia renal, proteinuria franca (>1g/24 h) o infección urinaria. Se analizó la expresión de las siguientes citocinas con el fin de establecer el patrón de respuesta, Th1 mediante la expresión de interferón gamma (IFNγ) y Th2 mediante la expresión de interleucina-4 (IL-4). El protocolo de trabajo incluyó los siguientes pasos: 1) Extracción sanguínea utilizando EDTA como anticoagulante, 2) Separación de las células mononucleares utilizando gradiente de Ficoll-Hypaque, 3) Extracción del ARN, 4) Comprobación de la integridad del ARN, 5) Retrotranscripción, 6) Integridad del ADNc y 7) Reacción en cadena de la polimerasa en tiempo real. La determinación de las concentraciones relativas de IFNγ e IL-4, se efectuó utilizando el gen de la gliceraldehído 3 fosfato deshidrogenasa como gen de referencia. Los resultados obtenidos [mediana (rango)] para IFNγ en las embarazadas patológicas y en el GC fueron respectivamente: 0,55 (0,14-23,74) y 0,96 (0,12-14,23) y para IL-4: 0,88 (0,17-3,44) y 2,5 (0,27-18,5). No hubo diferencia significativa en los niveles de IL-4 ni de IFNγ entre las mujeres con embarazo patológico y el GC (p=0,076 y p=0,438; respectivamente). El coeficiente de correlación de rangos de Spearman entre ambas variables fue -0,100 (p=0,77) para las embarazadas patológicas y -0,09 (p=0,78) para el GC. Se concluye que, en la muestra analizada, no se evidencia un desequilibrio entre los perfiles Th1 yTh2 que permita adjudicarle un rol patogénico en las complicaciones hipertensivas del embarazo.Ítem Acceso Abierto Analysis of biomarkers of inflammation and oxidative stress in chagas disease(Sociedad Argentina de Investigación Clínica, 2016-11) Martí, María Belén; Lioi, Susana; Gerrard, Gabriela; Diviani, Romina; Ceruti, María José; Beloscar, Juan; D'Arrigo, Mabel; Sociedad Argentina de Investigación Clínica (SAIC)Introduction: The pathophysiologic factors that control the formation and perpetuation of heart inflammation in chagasic patients were not yet fully clarified. Chronic inflammatory processes induce oxidative/nitrosative stress and lipid peroxidation.Ítem Acceso Abierto Antiphospholipid and antioangiogenic activity in females with recurrent miscarriage and antiphospholipid syndrome(SAGE, 2016-11-02) Pelusa, Héctor Fabián; Pezzarini, Eleonora; Basiglio, Cecilia Lorena; Musuruana, Jorge; Bearzotti, Mariela; Svetaz, María José; Daniele, Stella Maris; Bottai, Hebe; Arriaga, Sandra Mónica MaríaÍtem Acceso Abierto Arabidopsis thaliana Hcc1 is a Sco-like metallochaperonefor Cu A assembly in Cytochrome c Oxidase(Wiley, 2020-12) Llases, María Eugenia; Lisa, María Natalia; Morgada, Marcos Nicolás; Giannini, Estefanía; Alzari, Pedro M.; Vila, Alejandro J.The assembly of the CuA site in Cytochrome c Oxidase (COX) is a criticalstep for aerobic respiration in COX-dependent organisms. Several geneproducts have been associated with the assembly of this copper site, themost conserved of them belonging to the Sco family of proteins, whichhave been shown to perform different roles in different organisms. Plantsexpress two orthologs of Sco proteins: Hcc1 and Hcc2. Hcc1 is known tobe essential for plant development and for COX maturation, but its precisefunction has not been addressed until now. Here, we report the biochemi-cal, structural and functional characterization of Arabidopsis thaliana Hcc1protein (here renamed Sco1). We solved the crystal structure of the Cu+1-bound soluble domain of this protein, revealing a tri coordinated environ-ment involving a CxxxCxnH motif. We show that AtSco1 is able to workas a copper metallochaperone, inserting two Cu+1 ions into the CuA site ina model of CoxII. We also show that AtSco1 does not act as a thiol-disul-fide oxido-reductase. Overall, this information sheds new light on the bio-chemistry of Sco proteins, highlighting the diversity of functions amongthem despite their high structural similarities.Ítem Acceso Abierto Assessing endocrine and immune parameters in human immunodeficiency virus-infected patients before and after the immune reconstitution inflammatory syndrome(Brazilian Society of Endocrinology and Metabolism, 2018-02) Rateni, Liliana Beatriz; Lupo, Sergio; Racca, Liliana; Palazzi, Jorge; Ghersevich, Sergio AlbinoObjective: The present study compares immune and endocrine parameters between HIV-infected patients who underwent the Immune Reconstitution Inflammatory Syndrome (IRIS-P) during antiretroviral therapy (ART) and HIV-patients who did not undergo the syndrome (non-IRIS-P). Materials and methods: Blood samples were obtained from 31 HIV-infected patients (15 IRIS-P and 16 non-IRIS-P) before ART (BT) and 48 ± 2 weeks after treatment initiation (AT). Plasma Interleukin-6 (IL-6) and Interleukin-18 (IL-18) were determined by ELISA. Cortisol, dehydroepiandrosterone sulfate (DHEA-S) and thyroxin concentrations were measured using chemiluminescence immune methods. Results: Concentrations of IL-6 (7.9 ± 1.9 pg/mL) and IL-18 (951.5 ± 233.0 pg/mL) were significantly higher (p < 0.05) in IRIS-P than in non-IRIS-P (3.9 ± 1.0 pg/mL and 461.0 ± 84.4 pg/mL, respectively) BT. Mean T4 plasma level significantly decreased in both groups of patients after treatment (p < 0.05). In both groups cortisol levels were similar before and after ART (p > 0.05). Levels of DHEA-S in IRIS-P decreased AT (1080.5 ± 124.2 vs. 782.5 ± 123.8 ng/mL, p < 0.05) and they were significantly lower than in non-IRIS-P (782.5 ± 123.8 vs. 1203.7 ± 144.0 ng/mL, p < 0.05). IRIS-P showed higher values of IL-6 and IL-18 BT and lower levels of DHEA-S AT than in non-IRIS-P. Conclusion: These parameters could contribute to differentiate IRIS-P from non-IRIS-P. The significant decrease in DHEA-S levels in IRIS-P after ART might suggest a different adrenal responseÍtem Acceso Abierto Bacterially produced metabolites protect C. elegans neurons from degeneration(Public Library of Science, 2020-03-24) Urrutia, Arles; Garcia Angulo, Victor Antonio; Fuentes, Andrés; Caneo, Mauricio; Legüe, Marcela; Urquiza Zurich, Sebastian; Delgado, Scarlett E; Ugalde, Juan; Burdisso, Paula; Calixto, AndreaCaenorhabditis elegans and its cognate bacterial diet comprise a reliable, widespread model to study diet and microbiota effects on host physiology. Nonetheless, how diet influences the rate at which neurons die remains largely unknown. A number of models have been used in C. elegans as surrogates for neurodegeneration. One of these is a C. elegans strain expressing a neurotoxic allele of the mechanosensory abnormality protein 4 (MEC-4d) degenerin/epithelial Na+ (DEG/ENaC) channel, which causes the progressive degeneration of the touch receptor neurons (TRNs). Using this model, our study evaluated the effect of various dietary bacteria on neurodegeneration dynamics. Although degeneration of TRNs was steady and completed at adulthood in the strain routinely used for C. elegans maintenance (Escherichia coli OP50), it was significantly reduced in environmental and other laboratory bacterial strains. Strikingly, neuroprotection reached more than 40% in the E. coli HT115 strain. HT115 protection was long lasting well into old age of animals and was not restricted to the TRNs. Small amounts of HT115 on OP50 bacteria as well as UV-killed HT115 were still sufficient to produce neuroprotection. Early growth of worms in HT115 protected neurons from degeneration during later growth in OP50. HT115 diet promoted the nuclear translocation of DAF-16 (ortholog of the FOXO family of transcription factors), a phenomenon previously reported to underlie neuroprotection caused by down-regulation of the insulin receptor in this system. Moreover, a daf-16 loss-of-function mutation abolishes HT115-driven neuroprotection. Comparative genomics, transcriptomics, and metabolomics approaches pinpointed the neurotransmitter γ-aminobutyric acid (GABA) and lactate as metabolites differentially produced between E. coli HT115 and OP50. HT115 mutant lacking glutamate decarboxylase enzyme genes (gad), which catalyze the conversion of GABA from glutamate, lost the ability to produce GABA and also to stop neurodegeneration. Moreover, in situ GABA supplementation or heterologous expression of glutamate decarboxylase in E. coli OP50 conferred neuroprotective activity to this strain. Specific C. elegans GABA transporters and receptors were required for full HT115-mediated neuroprotection. Additionally, lactate supplementation also increased anterior ventral microtubule (AVM) neuron survival in OP50. Together, these results demonstrate that bacterially produced GABA and other metabolites exert an effect of neuroprotection in the host, highlighting the role of neuroactive compounds of the diet in nervous system homeostasis.Ítem Acceso Abierto Biochemistry of copper site assembly in heme-copper oxidases: a theme with variations(MDPI, 2019-08-05) Llases, María Eugenia; Morgada, Marcos Nicolás; Vila, Alejandro J.Ítem Acceso Abierto Biomarcadores asociados a estrés oxidativo en miocardiopatía chagásica(2014-11-12) Caffaratti, Julia Marina; Lioi, Susana; Gerrard, Gabriela; Diviani, Romina; Ceruti, María José; Beloscar, Juan; D'Arrigo, Mabel; Sociedad Argentina de Investigación ClínicaObjetivo: El objetivo de este trabajo fue realizar un estudio descriptivo de biomarcadores de estrés oxidativo como actividad enzimática de superoxido dismutasa (SOD), catalasa (CAT), medición de punto final de la oxidación lipídica es el ensayo de Sustancias Reactivas del Ácido Tiobarbitúrico (TBARS).Ítem Acceso Abierto Biomarcadores de estrés oxidativo e inflamación en miocardiopatía chagásica(Universidad Nacional de Rosario, 2018-10) Diviani, Romina; Lioi, Susana; Gerrard, Gabriela; Ceruti, María José; Martí, María Belén; Beloscar, Juan; D'Arrigo, Mabel; Universidad Nacional de RosarioÍtem Acceso Abierto Biomarcadores de estrés oxidativo en chagas(Colegio de Bioquímicos de la Provincia de Santa Fe 2a. Circunscripción, 2018-07) Diviani, Romina; Gerrard, Gabriela; Lioi, Susana; Ceruti, María José; Martí, María Belén; Beloscar, Juan; D’Arrigo, Mabel; Colegio de Bioquímicos de la Provincia de Santa Fe 2a. CircunscripciónÍtem Acceso Abierto Biomarcadores de estrés oxidativo y miocardiopatía chagásica(2014-06) Lioi, Susana; Gerrard, Gabriela; Ceruti, María José; Diviani, Romina; D'Arrigo, Mabel; Beloscar, Juan; Colegio de Bioquímicos de la Provincia de Santa Fe 2a. CircunscripciónIntroducción: Se han sugerido numerosos mecanismos para explicar la patogénesis de la enfermedad cardiaca de Chagas (EC). La respuesta del hospedero a la infección persistente de T. cruzi, involucra la generación sostenida de especies reactivas (ROS/RNS) mediante células inflamatorias y la disfunción mitocondrial en el corazón, la cual conduce a la presentación de estrés oxidativo a largo plazo, tanto del tejido cardíaco como de los parásitos que se encuentran al interior de las células cardíacas.