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Findings from Studies Are Congruent with Obesity Having a Viral Origin, but What about Obesity-Related NAFLD?
Tarantino, Giovanni; Citro, Vincenzo; Cataldi, Mauro.
  • Tarantino G; Department of Clinical Medicine and Surgery, "Federico II" University Medical School of Naples, 80131 Napoli, Italy.
  • Citro V; Department of General Medicine, "Umberto I" Hospital, Nocera Inferiore (Sa), 84014 Nocera Inferiore, Italy.
  • Cataldi M; Section of Pharmacology, Department of Neuroscience, Reproductive Sciences and Dentistry, "Federico II" University of Naples, 80131 Napoli, Italy.
Viruses ; 13(7)2021 07 01.
Article in English | MEDLINE | ID: covidwho-1448932
ABSTRACT
Infection has recently started receiving greater attention as an unusual causative/inducing factor of obesity. Indeed, the biological plausibility of infectobesity includes direct roles of some viruses to reprogram host metabolism toward a more lipogenic and adipogenic status. Furthermore, the probability that humans may exchange microbiota components (virome/virobiota) points out that the altered response of IFN and other cytokines, which surfaces as a central mechanism for adipogenesis and obesity-associated immune suppression, is due to the fact that gut microbiota uphold intrinsic IFN signaling. Last but not least, the adaptation of both host immune and metabolic system under persistent viral infections play a central role in these phenomena. We hereby discuss the possible link between adenovirus and obesity-related nonalcoholic fatty liver disease (NAFLD). The mechanisms of adenovirus-36 (Ad-36) involvement in hepatic steatosis/NAFLD consist in reducing leptin gene expression and insulin sensitivity, augmenting glucose uptake, activating the lipogenic and pro-inflammatory pathways in adipose tissue, and increasing the level of macrophage chemoattractant protein-1, all of these ultimately leading to chronic inflammation and altered lipid metabolism. Moreover, by reducing leptin expression and secretion Ad-36 may have in turn an obesogenic effect through increased food intake or decreased energy expenditure via altered fat metabolism. Finally, Ad-36 is involved in upregulation of cAMP, phosphatidylinositol 3-kinase, and p38 signaling pathways, downregulation of Wnt10b expression, increased expression of CCAAT/enhancer binding protein-beta, and peroxisome proliferator-activated receptor gamma 2 with consequential lipid accumulation.
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Full text: Available Collection: International databases Database: MEDLINE Main subject: Lipid Metabolism / Non-alcoholic Fatty Liver Disease / Inflammation / Obesity Topics: Long Covid Limits: Animals / Humans Language: English Year: 2021 Document Type: Article Affiliation country: V13071285

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Full text: Available Collection: International databases Database: MEDLINE Main subject: Lipid Metabolism / Non-alcoholic Fatty Liver Disease / Inflammation / Obesity Topics: Long Covid Limits: Animals / Humans Language: English Year: 2021 Document Type: Article Affiliation country: V13071285