2019) Cigarette smoke exposure induces ROS-mediated autophagy by regulating sestrin, AMPK, and mTOR level in mice, ABSTRACT Many pathological conditions linked to cigarette smoking are caused by the production of reactive oxygen species (ROS). The present study was conducted to analyze the effect of ROS on the lungs of Swiss mice exposed to cigarette smoking, focusing on autophagy-mediated mechanisms, and investigate the involvement of SESN2, AMPK, and mTOR signaling. Mice were exposed to cigarette smoke (CS) for 7, 15, 30, 45, and 60 days; the control group was not exposed to CS. Only mice exposed to CS for 45 days were selected for subsequent N-acetylcysteine (NAC) supplementation and smoke cessation analyses. Exposure to CS increased the production of ROS and induced molecular changes in the autophagy pathway, including an increase in phosphorylated AMPK and ULK1, reduction in phosphorylated mTOR, and increases in SESN2, ATG12, and LC3B levels. NAC supplementation reduced ROS levels and reversed all molecular changes observed upon CS treatment, suggesting the involvement of oxidative stress in inducing autophagy upon CS exposure. When exposure to CS was stopped, there were decreases in the levels of oxidative stress, AMPK and ULK1 phosphorylation, and autophagy-initiating molecules and increase in mTOR phosphorylation. In conclusion, these results suggest the involvement of ROS, SESN2, AMPK, and mTOR in the CS-induced autophagic process in the lung.
Este estudo teve como objetivo avaliar a capacidade funcional, força e desempenho muscular respiratório e grau de funcionalidade, de pacientes submetidos a cirurgias abdominais. Trata-se de um estudo de cunho transversal, exploratório, descritivo e quantitativo, composto por uma amostra não probabilística - intencional de 20 pacientes. Foi realizada avaliação das Pressões Respiratórias Máximas (PRM), Ventilação Voluntária Máxima (VVM), Pico de Fluxo Expiratório (PFE), o teste “Timed Up And Go” (TUG) e verificação do grau de independência funcional a partir da escala de Medida de Independência Funcional (MIF). A análise estatística foi realizada pelo programa SPSS 22.0 e as correlações foram realizadas por meio do teste Qui-Quadrado/Teste Exato de Fisher/Spearman, com nível de significância para p<0,05. Observou-se 35% da funcionalidade dos pacientes na classificação geral da MIF e na categoria autocuidado, 55% na categoria mobilidade e 77% na categoria locomoção no pós-operatório de cirurgias abdominais. Observou-se uma associação estatisticamente significativa entre o grau de funcionalidade e o risco de quedas (p>0,05) e entre a categoria locomoção da MIF com o risco de quedas (p>0,05). Conclui-se que os pacientes submetidos às cirurgias abdominais apresentaram uma diminuição significativa da força, função e desempenho muscular respiratório, assim como, podem predispor a um declínio da mobilidade e funcionalidade, expondo o paciente a um maior risco de quedas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.