Physical exercise positively modulates nonalcoholic steatohepatitis-related hepatic endoplasmic reticulum stress

• Type: Article in International Scientific Journal
• Date: 2022

Authors

Emanuel Passos (Author) Other; Cidália Pereira (Author) Other; Inês O. Gonçalves (Author) Other; Ana Faria (Author) Other; António Ascensão (Author) FADEUP; Rosário Monteiro (Author) Other; José Magalhães (Author) FADEUP; Maria J. Martins (Author) FMUP

Journal

Title: Journal of Cellular Biochemistry

Vol. 123 No. 10

Pages: 1647-1662

ISSN: 0730-2312

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Scientific classification

FOS: Social sciences

Other information

Authenticus ID: P-00W-EYF

DOI: 10.1002/jcb.30250

Abstract (EN): Obesity is a predictive factor for the development of nonalcoholic steatohepatitis (NASH). Although some of the mechanisms associated with NASH development are still elusive, its pathogenesis relies on a complex broad spectrum of (interconnected) metabolic-based disorders. We analyzed the effects of voluntary physical activity (VPA) and endurance training (ET), as preventive and therapeutic nonpharmacological strategies, respectively, against hepatic endoplasmic reticulum (ER) stress, ER-related proapoptotic signaling, and oxidative stress in an animal model of high-fat diet (HFD)-induced NASH. Adult male Sprague-Dawley rats were divided into standard control liquid diet (SCLD) or HFD groups, with sedentary, VPA, and ET subgroups in both (sedentary animals with access to SCLD [SS], voluntarily physically active animals with access to SCLD [SV], and endurance-trained animals with access to SCLD [ST] in the former and sedentary animals with access to liquid HFD [HS], voluntarily physically active animals with access to liquid HFD [HV], and endurance-trained animals with access to liquid HFD [HT] in the latter, respectively). Hepatic ER stress and ER-related proapoptotic signaling were evaluated by Western blot and reverse transcriptase-polymerase chain reaction; redox status was evaluated through quantification of lipid peroxidation, protein carbonyls groups, and glutathione levels as well as antioxidant enzymes activity. In SCLD-treated animals, VPA significantly decreased eukaryotic initiation factor-2 alpha (eIF2 alpha). In HFD-treated animals, VPA significantly decreased eIF2 alpha and phospho-inositol requiring enzyme-1 alpha (IRE1 alpha) but ET significantly decreased eIF2 alpha and significantly increased both spliced X-box binding protein 1 (sXBP1) and unspliced X-box binding protein 1; a significant increase of phosphorylated-eIF2 alpha (p-eIF2 alpha) to eIF2 alpha ratio occurred in ET versus VPA. HS compared to SS disclosed a significant increase of total and reduced glutathione, HV compared to SV a significant increase of oxidized glutathione, HT compared to ST a significant increase of p-eIF2 alpha to eIF2 alpha ratio and sXBP1. Physical exercise counteracts NASH-related ER stress and its associated deleterious consequences through a positive and dynamical modulation of the hepatic IRE1 alpha-X-box binding protein 1 pathway.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16