19 results on '"Poletta, Gisela Laura"'
Search Results
2. Prenatal exposure to pesticide mixture in Argentina: A pilot study in puerperal women from Santa Fe province
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Colussi, Carlina Leila, primary, Martinez, Guillaume, additional, Bellenger, Jean‐Philippe, additional, Poletta, Gisela Laura, additional, and Simoniello, María Fernanda, additional
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- 2024
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3. Evaluation of Stage-Dependent Genotoxic Effect of Roundup® (Glyphosate) on Caiman latirostris Embryos
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Burella, Pamela Mariana, Simoniello, Maria Fernanda, and Poletta, Gisela Laura
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- 2017
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4. DNA damage and oxidative stress in gill cells of Cnesterodon decemmaculatus exposed to pesticides by runoff source in an agricultural basin.
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Pautasso, Néstor Abel, Poletta, Gisela Laura, Paravani, Enrique Valentín, Sasal, María Carolina, and Simoniello, María Fernanda
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AGRICULTURAL pollution ,DNA damage ,OXIDATIVE stress ,AGRICULTURE ,PESTICIDE pollution ,PESTICIDES ,WATERSHEDS - Abstract
In our country, great concern exists about diffuse pollution cause by the great use of pesticides in rural environments. A thorough analysis is needed to generate information, know the real situation and thus, be able to make decisions with the purpose of reducing environmental pollution. In situ bioassays have been carried out using Cnesterodon decemmaculatus within limnocorrals located in a surface natural water system that receives rainfall excess flowing from an agricultural basin with a typical crop rotation, including corn, wheat and soy. Specimens were taken from the limnocorrals 72 h after a probed natural runoff event toward the water body, and the gill cells were used to evaluate the DNA damage (comet assay, CA), catalase enzyme activity (CAT), and lipid peroxidation (LPO). In addition, the physicochemical analysis of the water (pH, temperature) and the presence and concentration of pesticides were carried out. The results showed significant differences on DNA damage and oxidative stress on the gill cells of the exposed fish compared to controls, being the combination of the rain regime and the mixtures of pesticides used in corn and soy more toxic than in wheat. These results highlight the necessity to understand detrimental processes caused by pesticides used in extensive systems of primary production, in order to prevent and minimize diffuse contamination, contributing to environmental recovery and sustainability. [ABSTRACT FROM AUTHOR]
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- 2023
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5. Optimizing Protocols for High-Quality RNA Extraction from Blood and Liver Tissues of the Broad-Snouted Caiman
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López González, Evelyn Cecilia, primary, Odetti, Lucía Magdalena, additional, Poletta, Gisela Laura, additional, Denslow, Nancy, additional, Kroll, Kevin J., additional, Siroski, Pablo Ariel, additional, and Parachú Marcó, María Virginia, additional
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- 2021
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6. Biomarkers of geno- and cytotoxicity in the native broad-snouted caiman (Caiman latirostris): Chromosomal aberrations and mitotic index
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Chacón, Camila Felisa, primary, López González, Evelyn Cecilia, additional, and Poletta, Gisela Laura, additional
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- 2021
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7. Effects of glyphosate, cypermethrin, and chlorpyrifos on hematological parameters of the tegu lizard (Salvator merianae) in different embryo stages
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Mestre, Ana Paula, primary, Amavet, Patricia Susana, additional, van der Sloot, Imreël Stefanus, additional, Carletti, Julieta Verónica, additional, Poletta, Gisela Laura, additional, and Siroski, Pablo Ariel, additional
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- 2020
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8. Basal frequency of micronuclei and hematological parameters in the Side-necked Turtle, Phrynops hilarii (Duméril & Bibron, 1835)
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Latorre, María Agustina, López González, Evelyn Cecilia, Siroski, Pablo Ariel, and Poletta, Gisela Laura
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Ciencias Biológicas ,Inmune sistem ,purl.org/becyt/ford/1 [https] ,Otras Ciencias Biológicas ,Micronucleus test ,lcsh:Zoology ,lcsh:QL1-991 ,Genotoxicity ,purl.org/becyt/ford/1.6 [https] ,CIENCIAS NATURALES Y EXACTAS ,Hematological value - Abstract
The present study aimed to evaluate basal frequency of micronuclei (MN) and hematological values in adult Phrynops hilarii in order to propose this aquatic turtle, broadly distributed in our region, as a biological monitor for future studies of environmental pollution assessment. Thirty-two adult turtles from a semi-natural environment located at the Zoological Experimental Station (Santa Fe, Argentina) were used. Blood samples were taken and the following parameters were determined: basal frequency of MN (BFMN), total red blood cells (RBC) count, hematocrit (Ht), hemoglobin (Hb), total and differential white blood cells (WBC). The BFMN determined for the species was 3.56 ± 1.39, while hematological parameters showed the following reference values: 0.937 ± 0.12 x106 RBC/µl, 27062.50 ± 4565.43 WBC/mm3, hematocrit 18 ± 1.81% and Hb concentration 4.80 ± 0.45 g/dl. Differential WBC counts were: 76 ± 2.90% for lymphocytes, 20.12 ± 2.56% for heterophils, 1.5 ± 0.19% for monocytes, and 2.12 ± 0.61% for eosinophils, while no basophils were observed in any of the samples analyzed. No differences were observed between males and females in any of the variables analyzed. Data provided in this work could be useful as reference values for future studies of natural regions where P. hilarii occurs, employing this species as a sentinel organism for genotoxic and immunotoxic evaluation of environmental pollutants., Acta Herpetologica, Vol 10 No 1 (2015)
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- 2014
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9. Evaluation of Stage-Dependent Genotoxic Effect of Roundup® (Glyphosate) on Caiman latirostris Embryos
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Burella, Pamela Mariana, primary, Simoniello, Maria Fernanda, additional, and Poletta, Gisela Laura, additional
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- 2016
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10. Efectos de la radiación ultravioleta natural y artificial (UVA/ UVB) sobre la concentración plasmática de calcio y fósforo y el crecimiento en crías de Caiman latirostris
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Fernández, L., Poletta, Gisela Laura, Imhof, Alba, and Siroski, Pablo Ariel
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Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,calcio ,Otras Ciencias Biológicas ,Caiman latirostris ,crecimiento ,fósforo ,radiación ultravioleta ,purl.org/becyt/ford/1.6 [https] ,C. latirostris ,CIENCIAS NATURALES Y EXACTAS - Abstract
La radiación ultravioleta interviene en la síntesis de vitamina D3 , indispensable para metabolizar calcio y fósforo. Naturalmente, la cantidad y calidad de radiación recibida por los individuos depende de numerosos factores. En condiciones artificiales es posible manipular la radiación e inferir los efectos producidos por dicha exposición sobre el crecimiento y la concentración plasmática de calcio y fósforo en diferentes organismos. En este trabajo se utilizaron 96 crías de C. latirostris de 4 meses de edad, provenientes de nidos cosechados en la naturaleza. Los tratamientos fueron: oscuridad total, 8 y 16 h de radiación ultravioleta artificial (A-B), y fotoperíodo natural (FN), durante 90 días. Se evaluó crecimiento (peso, longitud total y hocico-cloaca) y concentración de calcio y fósforo en plasma. No se observó efecto de los tratamientos sobre las concentraciones de calcio pero si sobre las de fósforo, manifestándose un descenso significativo en el tratamiento de 16 h (p< 0,05). Podemos suponer que la exposición a la que se sometió a las crías no fue suficiente para producir un comportamiento generalizado del metabolismo fosfocálcico. Aquellos animales expuestos al FN presentaron el mayor crecimiento (p< 0,05). Estos resultados indicarían que la exposición natural seria la óptima para el crecimiento de crías de C. latirostris. Fil: Fernández, L.. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales. Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA); Argentina Fil: Poletta, Gisela Laura. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales. Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina Fil: Imhof, Alba. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales. Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA); Argentina Fil: Siroski, Pablo Ariel. Universidad Nacional del Litoral. Facultad de Humanidades y Ciencias. Departamento de Ciencias Naturales. Laboratorio de Zoología Aplicada: Anexo Vertebrados (FHUC-UNL/MASPyMA); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe; Argentina
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- 2013
11. Reptiles as Animal Models: Examples of their Utility in Genetics, Immunology and Toxicology
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Poletta, Gisela Laura, Siroski, Pablo Ariel, Amavet, Patricia Susana, Ortega, Hugo Hector, Mudry, Marta Dolores, and Lutterschmidt, William
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complemento ,Ciencias Biológicas ,Reptiles ,toxicologia ,CIENCIAS NATURALES Y EXACTAS ,Conservación de la Biodiversidad - Abstract
Historically, animals used as experimental models have contributed to the knowledgeof multiple aspects of organisms? biology and wildlife, providing valuable informationabout physiological processes, events, environmental situations, and even humaninteractions. Alternatives to animal testing are primarily based on biochemical assays orexperiments with cells/organs cultures, typically far more sophisticated and specific thanin vivo approaches. However, the whole organism allows for inferences about particularspecies and its situation in natural habitats. Sometimes, it is not possible to study directlythe species of interest, making it necessary to identify the closest related species that canbe used as a model organism. Reptiles may be good and interesting models as theyrespond both behaviorally and physiologically to environmental or experimentalconditions. This chapter specifically describes the utility of crocodiles, lizards, and turtlesas animal models in studies of genetics, immunology, and toxicology. The increasedinterest in reptile genomics is evident by newly sequenced genomes, by the establishmentof significant genomic resources for some reptile groups, and by the awareness thatgenomic diversity in Reptiles is substantially greater than that of mammals. Reptiles alsodemonstrate immune components with an apparently higher activity than othervertebrates. Their ability to resist serious injuries makes them interesting models toelucidate mechanisms within the defense system. In the same way, interesting studieswere performed to propose immune components to be used as indicators of toxicsexposure. Environmental contaminants can significantly affect many reptiles. However,these species are often excluded from toxicology studies and ecological risk assessments,even though they are important elements of ecosystems and show similar sensitivity tothat reported for birds and mammals. Genotoxicity, immunotoxicity and oxidative stresscompounds in reptile species, serving as early-warning signals of populationsenvironmentally exposed. Fil: Poletta, Gisela Laura. Universidad Nacional del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Siroski, Pablo Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina Fil: Amavet, Patricia Susana. Universidad Nacional del Litoral; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Ortega, Hugo Hector. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Santa Fe. Instituto de Ciencias Veterinarias del Litoral. Universidad Nacional del Litoral. Facultad de Ciencias Veterinarias. Instituto de Ciencias Veterinarias del Litoral; Argentina Fil: Mudry, Marta Dolores. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Ecología, Genética y Evolución de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Ecología, Genética y Evolución de Buenos Aires; Argentina
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- 2013
12. Monitoring of pesticide-induced damage in Caiman latirostris (Broad-snouted caiman) as sentinel organism in argentinian wetlands
- Author
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Poletta, Gisela Laura and Mudry, Marta Dolores
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CAIMAN LATIROSTRIS ,GENOTOXICIDAD ,BIOMARKERS ,GENOTOXICITY ,SENTINEL ORGANISM ,GLYPHOSATE ,GLIFOSATO ,ENZYMATIC ALTERATION ,BIOMARCADORES ,GROWTH DELAY ,ALTERACIONES ENZIMATICAS Y DEL DESARROLLO ,PESTICIDES ,PLAGUICIDAS ,ORGANISMO CENTINELA - Abstract
Caiman latirostris (yacaré overo) es una de las dos especies de cocodrilianos que habitan en Argentina. Como resultado de la expansión agrícola en Argentina en los últimos 15 años, asociada casi exclusivamente al cultivo de soja, muchas áreas de la distribución geográfica de esta especie quedaron como relictos de ambientes naturales inmersos en zonas con actividad agrícola intensa, donde innumerables plaguicidas se utilizan para el control de las plagas. En este trabajo de Tesis Doctoral se realizaron ensayos controlados de laboratorio y en condiciones semi-naturales para evaluar el efecto de la formulación Roundup® (RU), su principio activo (p.a.) glifosato (GFT), y la mezcla de formulaciones de GFT, endosulfán (ES) y cipermetrina (CIP), en embriones y neonatos de C. latirostris. Los resultados obtenidos indicaron que tanto RU como el p.a. GFT y la mezcla de GFT, ES y CIP, indujeron genotoxicidad, alteraciones enzimáticas y metabólicas y retardo en el crecimiento en embriones de C. latirostris luego de exposición in ovo y en neonatos, por exposición in vivo, incluso en concentraciones utilizadas en las prácticas agrícolas de rutina. De estos hallazgos se infiere que el uso masivo de dichos plaguicidas pondría en serio peligro a los organismos ambientalmente expuestos a ellos. Caiman latirostris (broad snouted-caiman) is one of the two species of crocodilians that occur in Argentina. As a consequence of agriculture frontiers expansion in the last 15 years, associated almost exclusively to soybean crop, many areas of the geographic distribution of the broad snouted caiman remain as fragments of natural environments immersed in areas of intense agricultural activity, where several pesticides are used for pest control. In the framework of the present Thesis, different assays were conducted in laboratory controlled conditions and field-like conditions in order to evaluate the effect produced by the pesticide formulation Roundup® (RU), its active principle (a.p.) glyphosate (GPT), and the mixture of the pesticides GPT, endosulfan (ES) and cypermethrin (CYP) in C. latirostris embryos and neonates. Results showed that RU, its a.p. GPT and the mixture of GPT, ES and CYP, induced genotoxicity, enzymatic and metabolic alterations as well as growth delay in C. latirostris embryos exposed in ovo and neonates exposed in vivo, even at concentration commonly used in routine agricultural practices. These results demostrated that the massive used of the pesticidas studied could imply a serious danger for the organisms environmentally exposed. Fil: Poletta, Gisela Laura. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina.
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- 2011
13. Effects ofin vivoexposure to Roundup® on immune system ofCaiman latirostris
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Latorre, María Agustina, primary, López González, Evelyn Cecilia, additional, Larriera, Alejandro, additional, Poletta, Gisela Laura, additional, and Siroski, Pablo Ariel, additional
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- 2012
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14. Ultraviolet Radiation on Innate Immunity and Growth of Broad‐Snouted Caiman (Caiman latirostris): Implications for Facilities Design
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Siroski, Pablo Ariel, primary, Poletta, Gisela Laura, additional, Fernandez, Lucia, additional, Ortega, Hugo Héctor, additional, and Merchant, Mark Edwin, additional
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- 2011
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15. Effects of in vivo exposure to Roundup® on immune system of Caiman latirostris.
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Latorre, María Agustina, López González, Evelyn Cecilia, Larriera, Alejandro, Poletta, Gisela Laura, and Siroski, Pablo Ariel
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BROAD-nosed caiman ,IMMUNE system ,REPTILE growth ,GLYPHOSATE in water ,BIODEGRADATION ,EXPERIMENTAL biology ,LEUCOCYTES - Abstract
The present study aimed to evaluate the effect of Roundup® (RU, glyphosate-based formulation) on some parameters of the immune system and growth of Caiman latirostris. Seventy-two caimans (20-day-old) from Proyecto Yacaré (Gob. Santa Fe/MUPCN) were used. Two groups were exposed for 2 months to different concentrations of RU (11 or 21 mg/L; taking into account the concentration recommended for its application in the field), while one group was maintained as control. The RU concentration was progressively decreased through the exposure period to simulate glyphosate degradation in water. Animals were measured and weighed at the beginning and end of the experiment, and blood samples taken after exposure to determine total and differential white blood cell (WBC) counts as well as total protein concentration (TPC), and for performing protein electrophoresis. The results showed that, compared against control hosts, there was a decrease in WBC counts, a higher percentage of heterophils, a higher TPC (with a low percentage of F2 protein fraction), and a negative effect on growth in the young caimans exposed to RU. These results demonstrate that in vivo exposure to RU induced alterations in the selected immune parameters, plasma proteins, and growth of caimans, thereby providing relevant information about the effects of this type of pesticide in this important species in the Argentinian wetlands. [ABSTRACT FROM AUTHOR]
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- 2013
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- View/download PDF
16. Ultraviolet Radiation on Innate Immunity and Growth of Broad-Snouted Caiman ( Caiman latirostris): Implications for Facilities Design.
- Author
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Siroski, Pablo Ariel, Poletta, Gisela Laura, Fernandez, Lucia, Ortega, Hugo Héctor, and Merchant, Mark Edwin
- Abstract
Sunlight is a key environmental factor in almost all ecosystems, and it is necessary for many physiological functions. Many vertebrates require ultraviolet (UV) radiation to perform different physiological processes. Artificial light is used to supplement UV in captive animals, through appropriate photoperiods and UV wavelengths. Previous studies reported that repeated exposure to artificial UV radiation may cause damage to the immune system. Taking into account the importance of UV effects and the serum complement system, the relationship between them was investigated. The study lasted 90 days and was carried out in plastic chambers. Ninety six broad-snouted caiman ( C. latirostris) were assigned to four treatment groups with two replicates each: total darkness (TD), 8 hr per day (8 hr) and 16 hr per day (16 hr) of artificial UV/visible light exposure, and normal photoperiod of natural light (NP). Snout-vent length was measured to determine animal growth. Hemolytic assays were performed to evaluate the effects of artificial UV/visible light, TD, and NP on the serum complement system. Results showed that animals grew more in the NP group. The capacity of C. latirostris serum to hemolyze sheep red blood cells was higher in the NP group than when they are maintained in constant light-dark cycles (8 and 16 hr) or in TD. These data demonstrate that artificial UV should be considered as a potential hazard for captive crocodilians if it is not properly managed, and this should be taken into account in the general design of facilities for reptilian husbandry. Zoo Biol 31:523-533, 2012. © 2011 Wiley Periodicals, Inc. [ABSTRACT FROM AUTHOR]
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- 2012
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17. Vigilancia sanitaria de anomalías congénitas en la provincia de Santa Fe: evaluación de factores de riesgos maternos y ambientales
- Author
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Colussi, Carlina Leila, Simoniello, María Fernanda, Aiassa, Delia, Antonelli, Marta, Barbero, Pablo, and Poletta, Gisela Laura
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Defectos de nacimiento ,Birth defects ,Public health ,Biomarcadores ,Prenatal exposure ,Exposición prenatal ,Plaguicidas ,Emergent pollutants ,Salud Pública ,Contaminantes emergentes ,Pesticides ,Biomarkers - Abstract
Fil: Colussi, Carlina Leila. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. La investigación epidemiológica de las anomalías congénitas representa un desafío debido a la multiplicidad de factores de riesgo asociados, entre ellos los ambientales. El monitoreo de los efectos genotóxicos en diferentes poblaciones es una herramienta útil en el biomonitoreo humano y tiene gran importancia biológica para estimar los riesgos de exposición a mezclas químicas complejas. El objetivo del presente estudio fue describir la prevalencia de anomalías congénitas relacionada con factores de exposición materna y ambiental mediante la determinación de biomarcadores de exposición y genotoxicidad en muestras maternas. Para ello, se desarrolló un estudio descriptivo transversal de casos y controles, en mujeres puérperas de Santa Fe, Argentina. Como resultado, 290 madres participaron en el estudio. Se observaron diferencias significativas entre ambos grupos, para lugares de residencia y variables ginecológicas. Se detectaron metabolitos de plaguicidas organoclorados (OC), organofosforados (OP) y piretroides (PYR), cuantificándose más frecuentemente atrazina (ATZ) (57,14%), carbendazim (CBZ) (46,42%) y metilparabeno (46,42%). Se encontró una correlación positiva entre el número de plaguicidas en sangre y las variables genotóxicas. Las madres de niños con anomalías genitourinarias fueron las que presentaron las mayores concentraciones de ATZ y OF. Estos resultados mostraron una realidad sanitaria, que podría impactar en gran medida en la salud de los futuros adultos, nacidos prematuros. Por otro lado, la mezcla de pesticidas detectada confirma las condiciones ambientales de vida de las mujeres y la exposición transplacentaria a estos compuestos en cada embarazo. Los efectos potenciales sobre la salud de los descendientes a largo plazo son desconocidos e impredecibles. The epidemiological investigation of congenital anomalies represents a challenge due to the multiplicity of associated risk factors, environmental among them. The monitoring of genotoxic effects in different populations is a useful tool in human biomonitoring and has great biological importance to estimate the exposure risks to complex mixtures of chemical substances. This study aimed to describe the prevalence of birth defects related to maternal and environmental exposure factors by determining exposure and genotoxicity biomarkers in maternal samples. A descriptive case and control cross-sectional study was developed in Santa Fe, Argentina postpartum women. As result, 290 women participated in the study. Significant differences were observed between both groups, for places of residence and gynecological variables. Metabolites of organochlorine (OC), organophosphate (OP), and pyrethroid (PYR) pesticides were detected. The most frequently quantified compounds were atrazine (ATZ) (57.14%), carbendazim (CBZ) (46.42%), and methylparaben (46.42%), among others. A positive correlation was found between the number of pesticides in blood and genotoxic variables. On the other hand, mothers of children with genitourinary anomalies were the ones with the highest concentrations of ATZ and OF. These results showed a deep background in the health reality of Santa Fe, which could greatly impact the health of future adults, who have been born preterm. On the other hand, the mixture of pesticides detected confirms the environmental living conditions of women and the transplacental exposure to these compounds in each pregnancy. The potential effects on long-term descendent health are unknown and unpredictable. Universidad Nacional del Litoral Ministerio de Producción, Ciencia y Tecnología de la Provincia de Santa Fe
- Published
- 2023
18. Identification and development of gene expression markers and specific genotoxic damage for pesticide-induced effect evaluation in Caiman latirostris
- Author
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Odetti, Lucía Magdalena, Poletta, Gisela Laura, Kass, Laura, Miglioranza, Karina Silvia Beatriz, Soloneski, Sonia, and Simoniello, María Fernanda
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Daño oxidativo al ADN ,Agroquímicos ,Oxidative DNA damage ,Defensa antioxidante ,Daño al ADN ,Antioxidant defense ,Reptiles ,DNA damage ,Gene expression ,Agrochemicals ,Expresión génica - Abstract
Fil: Odetti, Lucía Magdalena. Universidad Nacional del Litoral. Facultad de Bioquímica y Ciencias Biológicas; Argentina. El objetivo de este trabajo fue identificar respuestas de daño oxidativo, genotóxico y moleculares de expresión génica específicas como biomarcadores sensibles de exposición a plaguicidas en C. latirostris. Se evaluaron los efectos de las formulaciones de glifosato (GLI), cipermetrina (CIP) y clorpirifos (CPF) por separado y en forma de mezclas durante el período embrionario al igual que en juveniles y neonatos en condiciones semi-naturales. Las concentraciones utilizadas fueron las recomendadas para su aplicación en cultivos de soja con los siguientes grupos experimentales: GLI (Roundup® Full II): 2% y 1%; CIP (Atanor®): 0.12% y 0.06%; CPF (Lorsban®): 0.8% y 0.4%; 3 grupos expuestos a mezclas binarias, un grupo expuesto a la mezcla de las tres formulaciones, un control negativo y un control de vehículo. Se tomaron muestras de sangre para analizar el daño en el ADN y el daño oxidativo en el ADN, los niveles de peroxidación lipídica, las actividades de las enzimas CAT y SOD y la expresión de sus genes correspondientes. Además, se analizó el posible efecto sobre el desarrollo de los individuos. Los resultados indicaron daño en el ADN, con una fuerte incidencia en la oxidación de purinas y pirimidinas en el caso de exposición a formulaciones de GLI, CIP y CPF, así como en todas las mezclas. No se observó efecto sobre la LPO ni modificación de las enzimas antioxidantes. Sin embargo, encontramos variaciones significativas en los patrones de expresión de los genes cat y sod. Este es el primer análisis de expresión de genes asociados al estrés oxidativo y a defensas antioxidantes en C. latirostris y el primer reporte de su utilización como biomarcadores en respuesta a condiciones de estrés en este caso, ejercida por la exposición a plaguicidas. The objective of this work was to identify specific oxidative, genotoxic and molecular gene expression damage responses as sensitive biomarkers of pesticide exposure in C. latirostris. The effects of glyphosate (GLY), cypermethrin (CYP) and chlorpyrifos (CPF) formulations were evaluated separately and as mixtures during the embryonic period as well as in juveniles and neonates under semi-natural conditions. The concentrations used were those recommended for application in soybean crops with the following experimental groups: GLY (Roundup® Full II): 2% and 1%; CYP (Atanor®): 0.12% and 0.06%; CPF (Lorsban®): 0.8% and 0.4%; 3 groups exposed to binary mixtures, one group exposed to the mixture of the three formulations, a negative control and a vehicle control. Blood samples were taken to analyze DNA and oxidative DNA damage, lipid peroxidation levels, CAT and SOD enzyme activities and the expression of their corresponding genes. In addition, the possible effect on the development of individuals was analyzed. The results indicated DNA damage, with a strong impact on purine and pyrimidine oxidation in the case of exposure to GLY, CYP and CPF formulations, as well as in all mixtures. No effect on LPO or modification of antioxidant enzymes was observed. However, we found significant variations in the expression patterns of cat and sod genes. This is the first analysis of gene expression associated with oxidative stress and antioxidant defenses in C. latirostris and the first report of their use as biomarkers in response to stress conditions, in this case, exerted by exposure to pesticides. Agencia Nacional de Promoción Científica y Tecnológica Consejo Nacional de Investigaciones Científicas y Técnicas Ministerio de Ambiente y Cambio Climático Mutual del Personal Civil de la Nación
- Published
- 2021
19. Biomarkers of geno- and cytotoxicity in the native broad-snouted caiman (Caiman latirostris): Chromosomal aberrations and mitotic index.
- Author
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Chacón CF, López González EC, and Poletta GL
- Subjects
- Animals, Cells, Cultured, Chromatids drug effects, Chromatids genetics, Chromosomes genetics, Lymphocytes drug effects, Micronucleus Tests methods, Mitosis genetics, Mitotic Index methods, Alkylating Agents toxicity, Alligators and Crocodiles genetics, Biomarkers metabolism, Chromosome Aberrations drug effects, Chromosomes drug effects, Mitosis drug effects
- Abstract
We evaluated the sensitivity of the chromosomal aberration (CA) and mitotic index (MI) assays on peripheral blood lymphocytes (PBLs) of Caiman latirostris, following ex vivo exposure to the alkylating agent, MMS. Two concentrations of MMS were tested in cultured peripheral blood. Relative to controls, MMS exposure reduced the number of metaphases observed, but both the numbers of cells with MN and the percentages of aberrant metaphases increased. The types of CA identified were chromosome and chromatid breaks, chromosomal rearrangements, monosomies, and nullisomies, with significantly higher values in the MMS-exposed groups. The incorporation of the MI and CA tests in C. latirostris can provide information on damage caused by xenobiotic exposures., (Copyright © 2021 Elsevier B.V. All rights reserved.)
- Published
- 2021
- Full Text
- View/download PDF
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