Browsing by Subject "VACUNAS"

Now showing 1 - 4 of 4
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    Impacto del genotipo TLR4 en la respuesta humoral contra el virus sincicial respiratorio
    (2018) Levy, Hernán; Acosta, Patricio Leandro
    "El objetivo del presente trabajo consiste en "caracterizar la respuesta inmune humoral frente al virus del VSR de una muestra poblacional con diferentes genotipos en el gen codificante para TLR4 para determinar el papel del genotipo en la respuesta."
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    Second wave of COVID-19 pandemic in Argentinian population: vaccination is associated with a decrease in depressive symptoms
    (2022-06) Benedetti, Pedro; Barbuzza, Alejo; Moscato, Franco; Reppucci, Victoria; Goyeneche, Celina; Katche, Cynthia; Medina, Jorge Horacio; Viola, Haydeé; Ballarini, Fabricio; Moncada, Diego
    "Since the irruption of the coronavirus disease 2019 (COVID-19) the planet has submerged in a time of concern and uncertainty, with a direct impact on people's mental health. Moreover, the recurrent outbreaks that periodically harry different regions of the world constantly refocus people's concerns to the pandemic. Yet, each new wave heats the diverse countries in different situations, including the advances in their vaccination campaigns. In this research, we studied the levels of the general anxiety disorder (GAD) and depression in the Argentine population across the first and second waves of infections that occurred in our country."
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    The effect of neutralization of a cationic polymeric vaccine delivery system via addition of an anionic polymer on protein expression
    (2023-07-17) Dadi, Sabrina Mika
    Next generation vaccines have arisen as a quick response to the SARS-Cov-2 pandemic. This technology uses genetic material for immunization and allows a cost effective and adaptive method in comparison to classic vaccine platforms. Nevertheless, said genetic sequence needs an appropriate method in order to be delivered to host cells efficiently, promote cellular uptake and prevent degradation. In this study, the delivery of self-amplifying RNA (saRNA) using a cationic polymer is analysed. Nanoparticles were formulated via self assembly, using the polymer poly (cystamine bisacrylamide-co-4-amino-1-butanol) (pABOL) as well as saRNA coding for the gene of interest, firefly luciferase. Surface charge is one of the main differences seen when comparing the encapsulation of these nanoparticles to the FDA approved lipid nanoparticles (LNPs), LNPs are neutral, whereas pABOL nanoparticles are cationic. And although LNP delivery has led to an overall higher immune response, pABOL delivery has induced 100x higher intramuscular protein expression. Therefore, the surface charge of pABOL nanoparticles was modified in order to study characteristics such as size, polydispersity index and protein expression in vitro. The anionic polymer polyglutamic acid (PGA) was used and a series of formulations using different weight to weight ratios of PGA to pABOL were prepared. This polymer has been previously added to cationic lipoparticles so as to modify its surface charge and study the effect on the biodistribution. Increasing levels of PGA led to anionic particles, as expected, and protein expression levels comparable to that of cationic particles formulated without PGA. It was also seen that neutral particles showed particle sizes of approximately 1000 nm and a significantly lower protein expression when tested in vitro. The formulation technique was also studied. We found that for 50 μL doses prepared for in vitro experiments, there were no significant differences in the particle characteristics when formulation methods varied, but this was not the case for in vivo formulations. Overall, PGA showed itself to be a promising polymer to complement pABOL characteristics when used as a delivery system for genetic material and we hypothesize that this has the potential to alter cellular tropism.
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    The impact of the succesive outbreaks of COVID-19, vaccination, and physical activity on mental health in the argentine population : a repeated cross-sectional study
    (2024-02-26) Barbuzza, Alejo Ramiro; Ballarini, Fabricio; Goyeneche, Celina; Reppucci, Victoria; Benedetti, Pedro; Moscato, Franco; Medina, Jorge H.; Katche, Cynthia; Moncada, Diego; Viola, Haydeé
    A controversy regarding the duration of generalized anxiety disorders (GAD) and depressive symptoms during the COVID-19 pandemic arose, stating that these symptoms last a short time, perhaps a few months, or that they are more persistent over time. After more than three years of the pandemic, this is still a question that requires an answer. The main goal of this work was to record the levels of self-perceived GAD and depression in the Argentine population at several time points during the pandemic to characterize whether they were transient or persisted over the successive waves of contagion. Furthermore, we studied the association between anti-COVID-19 vaccination and the high frequency of physical activity with GAD and depression levels to evaluate a possible protective role of these factors on mental health.