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Phosphorylated tau as a toxic agent in synaptic mitochondria: implications in aging and Alzheimer’s disease

Neural Regeneration Research 2022年第8期17卷 1645-1651页

作者： Angie K.Torres Bastián I.Rivera catalina m.polanco Claudia Jara Cheril Tapia-Rojas Laboratory of Neurobiology of Aging Centro de Biología Celular y Biomedicina(CEBICEM)Facultad de Medicina y CienciaUniversidad San SebastiánSede Los LeonesSantiagoChile

During normal aging,there is a decline in all physiological functions in the *** of the most affected organs is the brain,where neurons lose their proper synaptic function leading to cognitive *** is one of the main risk factors for the development of neurodegenerative diseases,such as Alzheimer’s *** of the main responsible factors for synaptic dysfunction in aging and neurodegenerative diseases is the accumulation of abnormal proteins forming *** most studied brain aggregates are the senile plaques,formed by Aβpeptide;however,the aggregates formed by phosphorylated tau protein have gained relevance in the last years by their *** is reported that neurons undergo severe mitochondrial dysfunction with age,with a decrease in adenosine 5′-triphosphate production,loss of the mitochondrial membrane potential,redox imbalance,impaired mitophagy,and loss of calcium buffer ***,abnormal tau protein interacts with several mitochondrial proteins,suggesting that it could induce mitochondrial ***,whether tau-mediated mitochondrial dysfunction occurs indirectly or directly is still unknown.A recent study of our laboratory shows that phosphorylated tau at Ser396/404(known as PHF-1),an epitope commonly related to pathology,accumulates inside mitochondria during normal *** accumulation occurs preferentially in synaptic mitochondria,which suggests that it may contribute to the synaptic failure and cognitive impairment seen in aged ***,we review the main tau modifications promoting mitochondrial dysfunction,and the possible mechanism ***,we discuss the evidence that supports the possibility that phosphorylated tau accumulation in synaptic mitochondria promotes synaptic and cognitive impairment in ***,we show evidence and argue about the presence of phosphorylated tau PHF-1 inside mitochondria in Alzheimer’s disease,which could be considered as an early event

关键词： age pathology aging Alzheimer’s disease hippocampus memory mitochondria PHF-1 phosphorylated tau synaptic mitochondria tau

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Red pigment production by Penicillium purpurogenum GH2 is influenced by pH and temperature

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第12期12卷 961-968页

作者： Alejandro méNDEZ catalina PéREZ Julio Cesar mONTAéZ Gabriela mARTíNEZ Cristóbal Noé AGUILAR Department of Food Science and Technology School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico Department of Organic Chemistry School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico Department of Chemical Engineering School of Chemistry Universidad Autónoma de Coahuila Saltillo 25280 Coahuila Mexico

The combined effects of pH and temperature on red pigment production and fungal morphology were evaluated in a submerged culture of Penicillium purpurogenum GH2, using Czapek-Dox media with D-xylose as a carbon source. An experimental design with a factorial fix was used: three pH values (5, 7, and 9) and two temperature levels (24 and 34 °C) were evaluated. The highest production of red pigment (2.46 g/L) was reached with a pH value of 5 and a temperature of 24 °C. Biomass and red pigment production were not directly associated. This study demon- strates that P. purpurogenum GH2 produces a pigment of potential interest to the food industry. It also shows the feasibility of producing and obtaining natural water-soluble pigments for potential use in food industries. A strong combined effect (pmperature was associated with maximal red pigment production (2.46 g/L).

关键词： Penicillium purpurogenum Food colorants Combined effects Water-soluble pigment

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Development of an analytical method based on solid-phase extraction and LC-mS/mS for the monitoring of current-use pesticides and their metabolites in human urine

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Journal of Environmental Sciences 2022年第1期34卷 153-163页

作者： Beibei Gao Giulia Poma Govindan malarvannan catalina Dumitrascu michiel Bastiaensen minghua Wang Adrian Covaci Toxicological Centre University of AntwerpWilrijk 2610Belgium Department of Pesticide Science College of Plant ProtectionState and Local Joint Engineering Research Center of Green Pesticide Invention and ApplicationNanjing Agricultural UniversityNanjing 210095China

Pyrethroids,organophosphorus pesticides and fipronil have been listed as priority chemicals in human biomonitoring studies because of their wide use and potential health effects in *** determination of 13 pesticides,including pyrethroids(deltamethrin,cypermethrin,permethrin,cyfluthrin,bifenthrin),organophosphorus(chlorpyrifos,chlorpyrifosmethyl,and malathion),fipronil,neonicotinoids(imidacloprid,acetamiprid and thiacloprid)and triazole(prothioconazole),together with 13 corresponding metabolites in human urine samples was achieved by solid-phase extraction and analysis by liquid chromatography coupled to tandem mass *** targeted compounds,except malathion dicarboxylic acid,were measured with a mean within-accuracy(n=5)of 71%–114%(RSD:1%–14%)and between-run(n=15)accuracy of 80%–118%(RSD:2%–14%).Limits of quantitation of the targeted analytes ranged from 0.1 to 16 pg/m *** detection result of urine samples from 25 volunteers indicated that the detection frequencies of 3,5,6-trichloro-2-pyridinol(median:448 pg/m L),6-chloropyridine-3-carboxylic acid(median:193 pg/m L),2-methyl-3-phenylbenzoic acid(median:181 pg/m L),3-phenoxybenzoic acid(median:99 pg/m L),2-isopropyl-6-methyl-4-pyrimidinol(median:77 pg/m L),cyfluthrin(median:59 pg/m L),cis-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylic acid(cis-DCCA,median:53 pg/m L),trans-DCCA(median:25 pg/m L),prothioconazole(median:21 pg/m L),imidacloprid(median:7 pg/m L),and prothioconazole-desthio(median:1 pg/m L)were>50%.The obtained results show that the validated method is suitable for the human biomonitoring of these currentuse pesticides and their metabolites.

关键词： Pyrethroids Organophosphorus Fipronil Neonicotinoids Urine Biomonitoring

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Diversity patterns, environmental drivers and changes in vegetation composition in dry inter-Andean valleys

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Journal of Plant Ecology 2017年第3期10卷 461-475页

作者： catalina Quintana marco Girardello Anders S.Barfod Henrik Balslev Department of Bioscience Ecoinformatics and Biodiversity GroupAarhus UniversityNy Munkegade 114DK-8000 Aarhus CDenmark Departamento de Ciencias Biológicas Pontificia Universidad Católica del EcuadorAv.12 de Octubre 1076Apartado postal 17012184QuitoEcuador

Aims We studied diversity,patterns of endemism and turnover of veg-etation composition in dry inter-Andean valleys(DIAVs)where lit-tle is known about the influence of the abiotic drivers controlling plant species composition and occurrences,and the life forms that contribute most toα-andβ-diversity,*** study was focused on DIAVs located in the highlands(800-2800 m)around the Equator(1°N-5°S).The following questions were addressed:(i)what differences exist between endemic and non-endemic species in terms of species number,frequency and abundance?(ii)are pat-terns ofα-andβ-diversity correlated with latitude?(iii)what are the major environmental drivers controlling spatial patterns in species composition and occurrence?methods We established 63 transects of 5×100 m in areas with DIAV vegetation,impacted as little as possible by human *** each transect,all mature trees and shrubs were identified and counted to determine their *** coverage of terrestrial herbs was *** additive models were used to quantify the relationship betweenα-andβ-diversity with *** recordα-diversity,we used the exponential Shannon *** Sørensen index was used to measureβ-diversity or species *** used canonical correspondence analysis to deter-mine species composition and generalized linear mixed models to quantify simultaneously the determinants of species occur-rence across species and *** models were evaluated using the Akaike information *** analyses were run separately for trees,herbs and *** Findings Overall,we found that shrubs was the most diverse life form,constituting 43%(12%endemic)of the 313 species,followed by herbs(36%;11.5%endemic)and trees(20%;5%endemic).Trees comprise mostly species with low abundance(e.g.mber of abundant species(>30 individuals ha^(−1)),includ-ing four endemic *** of the e

关键词： endemics α-diversity β-diversity life forms Ecuador

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Phylogeny and taxonomic revision of Thelonectria discophora(Ascomycota,Hypocreales,Nectriaceae)species complex

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Fungal Diversity 2015年第1期70卷 1-29页

作者： catalina Salgado-Salazar Amy Y.Rossman Gary J.Samuels Yuuri Hirooka Romina m.Sanchez Priscila Chaverri Department of Plant Science and Landscape Architecture University of Maryland2112 Plant Sciences BuildingCollege ParkMD 20742USA Systematic mycology and microbiology Laboratory USDA-ARSBeltsvilleMD 20705USA Biodiversity(mycology) Eastern Cereal and Oilseed Research CentreAgriculture and Agri-Food CanadaOttawaOntario K1A 0C6Canada Centro de Recursos Renovables de la Zona Semiarida-Cerzos Conicet Universidad Nacional del SurCamino La Carrindanga Km7B8000FWB Bahía BlancaProvincia de Buenos AiresArgentina Escuela de Biología Universidad de Costa RicaApartado11501-2060 San PedroSan JoséCosta Rica

Specimens regarded as Thelonectria discophora(Thelonectria,Nectriaceae,Hypocreales)constitute a conspicuous group of saprobic fungi on decaying plant material,characterized by red perithecia each with a broad mammiform(nipple-like)*** asexual state is characterized by a cylindrocarpon-like morphology,with 3–5 septate macroconidia,unicellular microconidia and chlamydospores that are rarely produced in *** the past,*** was regarded as one species with a wide geographic ***,a recent study rejected the monophyly and cosmopolitan distribution of this species,and showed the existence of at least 16 cryptic species distributed in three main *** combining the results of phylogenetic analyses of six nuclear loci and morphological studies,we revised the taxonomy of the *** species complex,resulting in the description of 12 new species and four new combinations based on historic *** though molecular phylogenetic analyses strongly support the segregation of these species,and are in agreement with previous studies,individual diagnostic morphological characters for each species could not be ***,discrete morphological traits corresponding to each of the three main groups of species were *** could be differentiated based on the average values of morphological traits as well as the presence/absence of characteristic asexual propagules and colony growth at ***,illustrations are provided for the recognized species.

关键词： New species Rubus canker Species concept Taxonomy

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Post-transcriptional gene silencing, transcriptional gene silencing and human immunodeficiency virus

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World Journal of Virology 2015年第3期4卷 219-244页

作者： catalina méndez Chantelle L Ahlenstiel Anthony D Kelleher the Kirby Institute for Infection and Immunity Wallace Wurth Building-Level 5Faculty of MedicineUniversity of New South Wales 2nd St Vincent’s Centre for Applied medical Research

While human immunodeficiency virus 1(HIV-1) infectionis controlled through continuous, life-long use of a combination of drugs targeting different steps of the virus cycle, HIV-1 is never completely eradicated from the body. Despite decades of research there is still no effective vaccine to prevent HIV-1 infection. Therefore, the possibility of an RNA interference(RNAi)-based cure has become an increasingly explored approach. Endogenous gene expression is controlled at both, transcriptional and post-transcriptional levels by noncoding RNAs, which act through diverse molecular mechanisms including RNAi. RNAi has the potential to control the turning on/off of specific genes through transcriptional gene silencing(TGS), as well as finetuning their expression through post-transcriptional gene silencing(PTGS). In this review we will describe in detail the canonical RNAi pathways for PTGS and TGS, the relationship of TGS with other silencing mechanisms and will discuss a variety of approaches developed to suppress HIV-1 via manipulation of RNAi. We will briefly compare RNAi strategies against other approaches developed to target the virus, highlighting their potential to overcome the major obstacle to finding a cure, which is the specific targeting of the HIV-1 reservoir within latently infected cells.

关键词： Human immunodeficiency virus 1 RNA interference Reservoirs Epigenetics Latency Transcriptional gene silencing Post-transcriptional gene silencing

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Chest neoplasms with infectious etiologies

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World Journal of Radiology 2011年第12期3卷 279-288页

作者： Carlos S Restrepo melissa m Chen Santiago martinez-Jimenez Jorge Carrillo catalina Restrepo Department of Radiology The University of Texas Health Science Center at San AntonioMail Code 78007703 Floyd Curl DriveSan Antonio TX 78229United States

A wide spectrum of thoracic tumors have known or suspected viral *** viruses can be classified by the type of genomic material they *** conditions found to have viral etiologies include post-transplant lymphoproliferative disease,lymphoid granulomatosis,Kaposi's sarcoma,Castleman's disease, recurrent respiratory papillomatosis,lung cancer,malignant mesothelioma,leukemia and *** involved in these conditions include Epstein-Barr virus, human herpes virus 8,human papillomavirus,Simian virus 40,human immunodeficiency virus,and Human T-lymphotropic *** findings,epidemiology and mechanism of transmission for these diseases are reviewed in detail to gain a more thorough appreciation of disease pathophysiology for the chest radiologist.

关键词： Acquired immunodeficiency syndrome Castleman’s disease Kaposi’s sarcoma Thoracic imaging Thoracic lymphoma Thoracic malignancies malignant mesothelioma

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Optimization of Parametric Periodograms for the Study of Density Fluctuations in a Supersonic Jet

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Journal of Signal and Information Processing 2013年第4期4卷 439-444页

作者： catalina Elizabeth Stern Forgach José manuel Alvarado Reyes Facultad de Ciencias Universidad Nacional Autónoma de México México City México

In our research on the density fluctuations of a supersonic jet we were confronted with a quite difficult problem. In the power spectrum obtained either with a spectrum analyzer, the peaks of the two of the modes that we wanted to identify overlapped. We needed to find a signal processing method that would resolve the two main frequencies. We made a thorough investigation of several methods and thought that parametric periodograms were the appropriate tool. The use of parametric periodograms in signal processing requires constant training. The proper application of this tool depends on the determination of the number of parameters that has to be used to best model a real signal. The methods generally used to determine this number are subjective, depending on trial and error and on the experience of the user. Some of these methods rely on the minimization of the estimated variance of the linear prediction error , as a function of the number of parameters n. In many cases, the graph vs n doesn’t have a minimum, and the methods cannot be used. In this paper, we show that there is a strong relationship between and the frequency resolution . That is, as we modify , we obtain graphs of vs n that present at least one minimum. The spectrum obtained with this optimal number of parameters, always reproduces the frequency information of the original signal. In this paper, we present basically the signal processing of the data obtained in a Rayleigh scattering experiment on a supersonic jet that has also been designed by the authors.

关键词： Parametric Periodograms Density Fluctuations Supersonic Jet

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molecular and Kinetic Characterization of the Fermentative Behavior of Saccharomyces cerevisiae Strains Isolated from North Patagonia

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Advances in microbiology 2016年第9期6卷 733-744页

作者： Adriana Beatriz Simes Ramona del Carmen maturano Valentín Tassile Adriana catalina Caballero Silvana maría del mónaco Facultad de Ciencias y Tecnología de los Alimentos Universidad Nacional del Comahue (UNCo) Villa Regina Argentina Grupo de Enología Instituto de Investigación y Desarrollo en Ingeniería de Procesos Biotecnología y Energías Alternativas (PROBIEN-Consejo Nacional de Investigaciones Científicas y Técnicas CONICET) Facultad de Ingeniería Universidad Nacional del Comahue (UNCo) Neuquén Argentina

At present, Argentina does not count with a production of indigenous yeast strains with suitable technological and oenological features to be used in the regional winery industry. Isolation and molecular characterization of these microorganisms and its fermentation attributes would be relevant to the sustainable development of the activity in the country and to recognize and preserve the biodiversity of the region. Eight strains isolated from grapes and musts from the North Patagonian region and genetically identified as Saccharomyces cerevisiae, were studied for their fermentation behavior, emphasizing in hexose transport through the plasma membrane, which is the limiting step of the process. Thus, sugar consumption profiles were analyzed in different media at laboratory scale, to be subsequently applied to the fermentation of natural musts. Three of the eight initial strains were selected, named NNm10, NIF8 and NmN16 according to their fermentation profiles. The expression of hexose transporters during fermentations revealed interesting differences in the response of each strain to sugar consumption, where transporters HXT2 and HXT5 showed significant changes in expression in Patagonian strains, which are normally associated to endurance to culture stress conditions. The results obtained by combining the characteristics studied, at molecular and physiological level, are extremely encouraging. Native strain NmN16, showed a high potential for application in local winemaking. Assays carried out on a pilot scale will determine the feasibility of applying this strain with promising technological features at industrial scale.

关键词： Fermentation Wine Saccharomyces cerevisiae Hexose Transporters

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management of Helicobacter pylori infection in Latin America: A Delphi technique-based consensus

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World Journal of Gastroenterology 2014年第31期20卷 10969-10983页

作者： Antonio Rollan Juan Pablo Arab m Constanza Camargo Roberto Candia Paul Harris Catterina Ferreccio Charles S Rabkin Juan Cristóbal Gana Pablo Cortés Rolando Herrero Luisa Durán Apolinaria García Claudio Toledo Alberto Espino Nicole Lustig Alberto Sarfatis catalina Figueroa Javier Torres Arnoldo Riquelme Clínica Alemana de Santiago Facultad de Medicina Clínica Alemana Universidad del Desarrollo Departamento de Gastroenterología Facultad de Medicina Pontificia Universidad Católica de Chile Division of Cancer Epidemiology and Genetics National Cancer InstituteRockville MD 20852 United States Programa de Salud Basada en Evidencia Pontificia Universidad Católica de Chile Departamento de Gastroenterología y Nutrición Pediátrica Facultad de Medicina Pontificia Universidad Católica de Chile Departamento de Salud Pública Facultad de Medicina Pontificia Universidad Católica de Chile International Agency for Research on Cancer World Health Organization Departamento de microbiología Facultad de Ciencias Biológicas Universidad de Concepción Unidad de Gastroenterología Hospital de Valdivia. Facultad de Medicina Universidad de Austral de Chile Unidad de Investigación en Enfermedades Infecciosas Instituto Mexicano del Seguro Social

AIm: To optimize diagnosis and treatment guidelines for this geographic region, a panel of gastroenterologists, epidemiologists, and basic scientists carried out a structured evaluation of available literature.

关键词： Helicobacter pylori Consensus development conference Delphi technique Latin America

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