Increased mTOR Signaling and Impaired Autophagic Flux Are Hallmarks of SARS-CoV-2 Infection

The COVID-19 (Coronavirus Disease 2019), caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), severely affects mainly individuals with pre-existing comorbidities. Here our aim was to correlate the mTOR (mammalian/mechanistic Target of Rapamycin) and autophagy pathways with the...

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Published in:	Current issues in molecular biology 2022-12, Vol.45 (1), p.327-336
Main Authors:	Zambalde, Érika Pereira, Dias, Thomaz Luscher, Maktura, Grazielle Celeste, Amorim, Mariene R, Brenha, Bianca, Santos, Luana Nunes, Buscaratti, Lucas, Elston, João Gabriel de Angeli, Mancini, Mariana Camargo Silva, Pavan, Isadora Carolina Betim, Toledo-Teixeira, Daniel A, Bispo-Dos-Santos, Karina, Parise, Pierina L, Morelli, Ana Paula, Silva, Luiz Guilherme Salvino da, Castro, Ícaro Maia Santos de, Saccon, Tatiana D, Mori, Marcelo A, Granja, Fabiana, Nakaya, Helder I, Proenca-Modena, Jose Luiz, Marques-Souza, Henrique, Simabuco, Fernando Moreira
Format:	Article
Language:	eng
Subjects:	autophagic flux Communication COVID-19 mTOR SARS-CoV-2 single-cell analysis
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Summary:	The COVID-19 (Coronavirus Disease 2019), caused by the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2), severely affects mainly individuals with pre-existing comorbidities. Here our aim was to correlate the mTOR (mammalian/mechanistic Target of Rapamycin) and autophagy pathways with the disease severity. Through western blotting and RNA analysis, we found increased mTOR signaling and suppression of genes related to autophagy, lysosome, and vesicle fusion in Vero E6 cells infected with SARS-CoV-2 as well as in transcriptomic data mining of bronchoalveolar epithelial cells from severe COVID-19 patients. Immunofluorescence co-localization assays also indicated that SARS-CoV-2 colocalizes within autophagosomes but not with a lysosomal marker. Our findings indicate that SARS-CoV-2 can benefit from compromised autophagic flux and inhibited exocytosis in individuals with chronic hyperactivation of mTOR signaling.
ISSN:	1467-3045 1467-3037 1467-3045