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Divya Chennamadhavuni, Noemi Alejandra Saavedra-Avila, Leandro J Carreño, Matthew J Guberman-Pfeffer, Pooja Arora, Tang Yongqing, Hui-Fern Koay, Dale I Godfrey, Santosh Keshipeddy, Stewart K Richardson, Srinivasan Sundararaj, Jae Ho Lo, Xiangshu Wen, José A Gascón, Weiming Yuan, Jamie Rossjohn, Jérôme Le Nours, Steven A Porcelli, Amy R Howell
Glycosylceramides that activate CD1d-restricted invariant natural killer T (iNKT) cells have potential therapeutic applications for augmenting immune responses against cancer and infections. Previous studies using mouse models identified sphinganine variants of α-galactosylceramide as promising iNKT cell activators that stimulate cytokine responses with a strongly proinflammatory bias. However, the activities of sphinganine variants in mice have generally not translated well to studies of human iNKT cell responses...
March 9, 2018: Cell Chemical Biology
Matthew J Guberman-Pfeffer, Jordan A Greco, Robert R Birge, Harry A Frank, José A Gascón
We report supramolecular quantum mechanics/molecular mechanics simulations on the peridinin-chlorophyll a protein (PCP) complex from the causative algal species of red tides. These calculations reproduce for the first time quantitatively the distinct peridinin absorptions, identify multichromophoric molecular excitations, and elucidate the mechanisms regulating the strongly allowed S0 (11 Ag - ) → S2 (11 Bu + ) absorptions of the bound peridinins that span a 58 nm spectral range in the region of maximal solar irradiance...
February 1, 2018: Journal of Physical Chemistry Letters
Ruoyang Shi, Matthew Guberman, Lorrie A Kirshenbaum
Autophagy is a catabolic process for eliminating macromolecules and damaged organelles by a highly regulated lysosomal pathway. Importantly, autophagy serves as an integral quality control mechanism by recycling cellular constituents for energy consumption and cellular rejuvenation under basal and stress conditions. Nevertheless, there is growing evidence that under certain conditions autophagy can switch from an adaptive survival mechanism to maladaptive process that promotes cell death. Furthermore, defects in autophagy have been linked to mitochondria injury and cell death associated with aging...
December 6, 2017: Trends in Cardiovascular Medicine
Shelia Guberman
Wertheimer's seminal paper of 1923 was of gerat influence in psychology and other sciences. Wertheimer also emphasized the weaknesses of the newborn Gestalt theory: too many basic laws, and the ambiguity of definitions. At the same time, the paper contained potential solutions to these problems, in the form of a number of very important ideas, some of which were presented implicitly: perception through imitation, communicative nature of linear drawings and writings, transfer from the visual domain to motor domain, linguistic interpretation of the Gestalt...
2017: Frontiers in Psychology
Abhinav Dhingra, Rahul Jayas, Pegah Afshar, Matthew Guberman, Graham Maddaford, Johnathan Gerstein, Brooke Lieberman, Hilary Nepon, Victoria Margulets, Rimpy Dhingra, Lorrie A Kirshenbaum
The Bcl-2 protein Bnip3 is crucial for provoking oxidative injury to mitochondria following anthracycline treatment or ischemia-reperfusion injury. Herein, we investigate the effects of the polyphenolic compound ellagic acid (EA) on Bnip3 mediated mitochondrial injury and necrotic cell death in cardiac myocytes. In contrast to vehicle treated cardiomyocytes, Bnip3 was highly enriched in mitochondrial fractions of cardiac myocytes treated with the anthracycline doxorubicin or in cells subjected to hypoxia (HPX)...
August 25, 2017: Free Radical Biology & Medicine
Ariel Waisman, Camila Vazquez Echegaray, Claudia Solari, María Soledad Cosentino, Iain Martyn, Alessia Deglincerti, Mohammad Zeeshan Ozair, Albert Ruzo, Lino Barañao, Santiago Miriuka, Ali Brivanlou, Alejandra Guberman
The cell cycle has gained attention as a key determinant for cell fate decisions, but the contribution of DNA replication and mitosis in stem cell differentiation has not been extensively studied. To understand if these processes act as "windows of opportunity" for changes in cell identity, we established synchronized cultures of mouse embryonic stem cells as they exit the ground state of pluripotency. We show that initial transcriptional changes in this transition do not require passage through mitosis and that conversion to primed pluripotency is linked to lineage priming in the G1 phase...
September 1, 2017: Journal of Molecular Biology
Emmanuel João Nogueira Leal Silva, Nancy Kudsi Carvalho, Marta Reis da Costa Labanca Guberman, Marina Prado, Plinio Mendes Senna, Erick M Souza, Gustavo De-Deus
INTRODUCTION: The present study investigated the root canal dentin bond strength of 2 newly developed fast-setting mineral trioxide aggregate (MTA) and pozzolan-based cements: ENDOCEM MTA (Maruchi, Wonju, Korea) and ENDOCEM Zr (Maruchi). White MTA (Angelus, Londrina, Brazil) was used as the reference material for comparison. METHODS: Root slices (1 mm ± 0.1 mm) were obtained from the middle third of 15 maxillary incisors previously selected. Three canal-like holes (0...
March 11, 2017: Journal of Endodontics
Matthew J Guberman-Pfeffer, Jordan A Greco, Lalith P Samankumara, Matthias Zeller, Robert R Birge, José A Gascón, Christian Brückner
Owing to their intense near infrared absorption and emission properties, to the ability to photogenerate singlet oxygen, or to act as photoacoustic imaging agents within the optical window of tissue, bacteriochlorins (2,3,12,13-tetrahydroporphyrins) promise to be of utility in many biomedical and technical applications. The ability to fine-tune the electronic properties of synthetic bacteriochlorins is important for these purposes. In this vein, we report the synthesis, structure determination, optical properties, and theoretical analysis of the electronic structure of a family of expanded bacteriochlorin analogues...
January 11, 2017: Journal of the American Chemical Society
David Thura, Guido Guberman, Paul Cisek
Recent studies have shown that activity in sensorimotor structures varies depending on the speed-accuracy trade-off (SAT) context in which a decision is made. Here we tested the hypothesis that the same areas also reflect a more local adjustment of SAT established between individual trials, based on the outcome of the previous decision. Two monkeys performed a reaching decision task in which sensory evidence continuously evolves during the time course of a trial. In two SAT contexts, we compared neural activity in trials following a correct choice vs...
February 1, 2017: Journal of Neurophysiology
Leonardo Romorini, Ximena Garate, Gabriel Neiman, Carlos Luzzani, Verónica Alejandra Furmento, Alejandra Sonia Guberman, Gustavo Emilio Sevlever, María Elida Scassa, Santiago Gabriel Miriuka
Human embryonic and induced pluripotent stem cells are self-renewing pluripotent stem cells (PSC) that can differentiate into a wide range of specialized cells. Basic fibroblast growth factor is essential for PSC survival, stemness and self-renewal. PI3K/AKT pathway regulates cell viability and apoptosis in many cell types. Although it has been demonstrated that PI3K/AKT activation by bFGF is relevant for PSC stemness maintenance its role on PSC survival remains elusive. In this study we explored the molecular mechanisms involved in the regulation of PSC survival by AKT...
October 20, 2016: Scientific Reports
María Questa, Leonardo Romorini, Carolina Blüguermann, Claudia María Solari, Gabriel Neiman, Carlos Luzzani, María Élida Scassa, Gustavo Emilio Sevlever, Alejandra Sonia Guberman, Santiago Gabriel Miriuka
Human foreskin fibroblasts were used to generate the iPSC line iPSC-FH2.1 using the EF1a-hSTEMCCA-loxP vector expressing OCT4, SOX2, c-MYC and KLF4, in 5% O2 culture conditions. Stemness was confirmed, as was pluripotency both in vivo and in vitro, in normoxia and hypoxia. Human Embryonic Stem Cell (hESC) line WA-09 and reprogrammed fibroblast primary culture HFF-FM were used as controls.
March 2016: Stem Cell Research
Annette Leibing, Nancy Guberman, Janine Wiles
There are many studies that have examined the meaning of home for older people. In this article, our aim is to add the concept of 'liminal homes' to the existing discussion: While the concept of liminal homes can be applied to a number of 'interim spaces', we focus in our study, on those older people who have to consider, or are concretely confronted with, the need to move into another living space, because of declining health. Based on interviews and photo-elicitation with 26 older lower-income seniors living in Montreal, Québec, this article demonstrates the complexity of liminality and analyzes the dynamics of this process, composed of a web of interrelated and often dichotomous elements...
April 2016: Journal of Aging Studies
Claudia Solari, Camila Vázquez Echegaray, Carlos Luzzani, María Soledad Cosentino, Ariel Waisman, María Victoria Petrone, Marcos Francia, Alina Sassone, Jésica Canizo, Gustavo Sevlever, Lino Barañao, Santiago Miriuka, Alejandra Guberman
Addition of methyl groups to arginine residues is catalyzed by a group of enzymes called Protein Arginine Methyltransferases (Prmt). Although Prmt1 is essential in development, its paralogue Prmt8 has been poorly studied. This gene was reported to be expressed in nervous system and involved in neurogenesis. In this work, we found that Prmt8 is expressed in mouse embryonic stem cells (ESC) and in induced pluripotent stem cells, and modulated along differentiation to neural precursor cells. We found that Prmt8 promoter activity is induced by the pluripotency transcription factors Oct4, Sox2 and Nanog...
April 22, 2016: Biochemical and Biophysical Research Communications
Laura Mc Conti, Tatiana Champion, Úrsula C Guberman, Carlos Ht Mathias, Stéfano L Fernandes, Elisângela Gm Silva, Monique A Lázaro, Aline Dcg Lopes, Viviane R Fortunato
Objectives This study assessed behavioral and physiologic stress parameters in cats placed in two environments: home and the veterinary hospital. With a widely used scale, several parameters were assessed, including respiratory rate (RR), heart rate (HR), systolic blood pressure (SBP), vagosympathetic responses using calculated intervals (heart rate variability [HRV]10, HRV20 and vasovagal tonus index [VVTI]) and 'stress attitude', such as struggling, vocalization and agitation during handling. In addition, we evaluated whether a feline facial pheromone analogue (FFPA) had an effect on any of these measures in either environment...
February 2017: Journal of Feline Medicine and Surgery
Claudia Solari, Camila Vázquez Echegaray, María Soledad Cosentino, María Victoria Petrone, Ariel Waisman, Carlos Luzzani, Marcos Francia, Emilly Villodre, Guido Lenz, Santiago Miriuka, Lino Barañao, Alejandra Guberman
Pluripotent stem cells possess complex systems that protect them from oxidative stress and ensure genomic stability, vital for their role in development. Even though it has been reported that antioxidant activity diminishes along stem cell differentiation, little is known about the transcriptional regulation of the involved genes. The reported modulation of some of these genes led us to hypothesize that some of them could be regulated by the transcription factors critical for self-renewal and pluripotency in embryonic stem cells (ESCs) and in induced pluripotent stem cells (iPSCs)...
2015: PloS One
Samuel Lapalme-Remis, Evan Cole Lewis, Christine De Meulemeester, Pranesh Chakraborty, K Michael Gibson, Carlos Torres, Alan Guberman, Gajja S Salomons, Cornelis Jakobs, Andre Ali-Ridha, Mahsa Parviz, Phillip L Pearl
OBJECTIVE: The natural history of succinic semialdehyde dehydrogenase (SSADH) deficiency in adulthood is unknown; we elucidate the clinical manifestations of the disease later in life. METHODS: A 63-year-old man with long-standing intellectual disability was diagnosed with SSADH deficiency following hospitalization for progressive decline, escalating seizures, and prolonged periods of altered consciousness. We present a detailed review of his clinical course and reviewed our SSADH deficiency database adult cohort to derive natural history information...
September 8, 2015: Neurology
Carlos Luzzani, Gabriel Neiman, Ximena Garate, María Questa, Claudia Solari, Darío Fernandez Espinosa, Marcela García, Ana Lía Errecalde, Alejandra Guberman, María Elida Scassa, Gustavo Emilio Sevlever, Leonardo Romorini, Santiago Gabriel Miriuka
INTRODUCTION: Mesenchymal stem cells (MSCs) are a promising source of cells for regenerative therapies. Although they can be isolated easily from several tissues, cell expansion is limited since their properties are lost with successive passages. Hence, pluripotent derived MSCs (PD-MSCs) arise as a suitable alternative for MSC production. Nevertheless, at present, PD-MSC derivation protocols are either expensive or not suitable for clinical purposes. METHODS: In this work we present a therapy-grade, inexpensive and simple protocol to derive MSCs from pluripotent stem cells (PSCs) based on the use of platelet lysate (PL) as medium supplement...
January 12, 2015: Stem Cell Research & Therapy
Steven L Guberman
Dissociative recombination rate constants are reported with electron temperature dependent uncertainties for the lowest 5 vibrational levels of the N2 (+) ground state. The rate constants are determined from ab initio calculations of potential curves, electronic widths, quantum defects, and cross sections. At 100 K electron temperature, the rate constants overlap with the exception of the third vibrational level. At and above 300 K, the rate constants for excited vibrational levels are significantly smaller than that for the ground level...
November 28, 2014: Journal of Chemical Physics
Haya Brama, Shoshana Guberman, Moshe Abeles, Edward Stern, Ido Kanter
Periodic synchronization of activity among neuronal pools has been related to substantial neural processes and information throughput in the neocortical network. However, the mechanisms of generating such periodic synchronization among distributed pools of neurons remain unclear. We hypothesize that to a large extent there is interplay between the topology of the neocortical networks and their reverberating modes of activity. The firing synchronization is governed by a nonlocal mechanism, the network delay loops, such that distant neuronal pools without common drives can be synchronized...
November 2015: Brain Structure & Function
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