Aerobic Exercise Training Prevents Insulin Resistance and Hepatic Lipid Accumulation in LDL Receptor Knockout Mice Chronically Fed a Low-Sodium Diet

Author(s)

Ferreira, Guilherme da Silva ^[1] ; Garcia Bochi, Ana Paula ^[1] ; Pinto, Paula Ramos ^[1] ; Del Bianco, Vanessa ^[1] ; Rodrigues, Leticia Gomes ^[1] ; Teixeira Morais, Mychel Raony Paiva ^[2] ; Nakandakare, Edna Regina ^[1] ; Machado, Ubiratan Fabres ^[3] ; Catanozi, Sergio ^[1] ; Passarelli, Marisa ^{[1, 4]}

Affiliation

^[1] Univ Sao Paulo, Lab Lipides LIM 10, Fac Med, Hosp Clin HCFMUSP, BR-01246903 Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Biomed Sci, Dept Cell & Dev Biol, BR-05508000 Sao Paulo - Brazil

^[3] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508000 Sao Paulo - Brazil

^[4] Univ Nove de Julho, Programa Posgrad Med, BR-01525000 Sao Paulo - Brazil

• Document type: Journal article
• Source: NUTRIENTS; v. 13, n. 7 JUL 2021.
• Web of Science Citations: 0

Abstract

Background: A low-sodium (LS) diet reduces blood pressure, contributing to the prevention of cardiovascular diseases. However, intense dietary sodium restriction impairs insulin sensitivity and worsens lipid profile. Considering the benefits of aerobic exercise training (AET), the effect of LS diet and AET in hepatic lipid content and gene expression was investigated in LDL receptor knockout (LDLr-KO) mice. Methods: Twelve-week-old male LDLr-KO mice fed a normal sodium (NS) or LS diet were kept sedentary (S) or trained (T) for 90 days. Body mass, plasma lipids, insulin tolerance testing, hepatic triglyceride (TG) content, gene expression, and citrate synthase (CS) activity were determined. Results were compared by 2-way ANOVA and Tukey's post-test. Results: Compared to NS, LS increased body mass and plasma TG, and impaired insulin sensitivity, which was prevented by AET. The LS-S group, but not the LS-T group, presented greater hepatic TG than the NS-S group. The LS diet increased the expression of genes related to insulin resistance (ApocIII, G6pc, Pck1) and reduced those involved in oxidative capacity (Prkaa1, Prkaa2, Ppara, Lipe) and lipoprotein assembly (Mttp). Conclusion: AET prevented the LS-diet-induced TG accumulation in the liver by improving insulin sensitivity and the expression of insulin-regulated genes and oxidative capacity. (AU)

• FAPESP's process: 16/15603-0 - Unraveling mechanisms of glycemic control and chronic complications of Diabetes mellitus: contributions to human health
• Grantee: Ubiratan Fabres Machado
• Support Opportunities: Research Projects - Thematic Grants