Abstract 326: Cd36 Deficiency Reduces Obesity-associated Inflammation And Oxidative Stress In Heart

2014 ◽  
Vol 115 (suppl_1) ◽  
Author(s):  
Tahar Hajri ◽  
Mohamed Gharib ◽  
Thomas V Fungwe
Keyword(s):  
Oxidative Stress ◽  
Fatty Acid ◽  
Glucose Uptake ◽  
Fatty Acid Oxidation ◽  
P38 Mapk ◽  
Acid Oxidation ◽  
Cd36 Deficiency ◽  
Anti Oxidant ◽  
The Impact ◽  
And Oxidative Stress

OBJECTIVE: Obesity is often associated with diabetes and cardiovascular diseases (CVD). Mounting evidence shows that diabetes is associated with structural and functional changes in the heart. CD36 protein is highly expressed in heart and regulates lipid utilization in cardiacmyocytes. In this paper, we investigated the impact of CD36 expression on obesity-associated inflammation and oxidative stress in heart. METHODS: Studies were conducted in control lean (WT), obese leptin deficient (Lep Ob/Ob ) and leptin deficient-CD36 null (Lep Ob/Ob -CD36 -/- ) mice. To examine obesity-associated insulin resistance, glucose uptake and insulin signaling were examined in adult mouse hearts. Presence of macrophages in heart was examined with immunohistochemisty. Oxidative stress makers and activity of anti-oxidant enzymes were measured in hearts. To evaluate substrate utilization, glucose and fatty acid oxidation was tested in primary cultures of ventricular myocytes. Finally, the activity of pro-inflammatory kinases p38 mitogen-activated protein kinases (p38-MAPK), c-Jun NH2-terminal kinases (JNK) were examined in cardiacmyocytes challenged with palmitate. RESULTS: In Lep Ob/Ob , glucose uptake and oxidation in heart was lower than lean WT mice, while cardiac FA oxidation was strongly higher. Silencing CD36 in Lep Ob/Ob mouse markedly improved insulin sensitivity and glucose uptake in heart, but resulted in marked reduction of FA oxidation. Immunostaining of heart sections with macrophage specific antibody F4/80 showed that macrophage content was higher in myocardium of Lep Ob/Ob mice than Lep Ob/Ob -CD36 -/- mice. Moreover, oxidative stress markers, isoprostanes and reactive oxygen species, and expression of pro-inflammatory cytokines were higher in hearts of Lep Ob/Ob than Lep Ob/Ob -CD36-/- mice, although the activities of anti-oxidant enzymes were comparable. Chronic overload of Lep Ob/Ob cardiac myocyte with palmitate strongly induced the activity of JNK and p38-MAPK, but was less effective in Lep Ob/Ob -CD36 -/- cardiac myocytes. CONCLUSIONS: These results show that CD36 deficiency induced a significant reduction of obesity-associated oxidative stress and inflammation in heart in parallel to a drop in fatty acid oxidation.

scholarly journals Acute fatty liver of pregnancy: an update on mechanisms

2011 ◽  
Vol 4 (3) ◽  
pp. 99-103 ◽  
Author(s):  
Sathish Kumar Natarajan ◽  
Kavitha R Thangaraj ◽  
Ashish Goel ◽  
C E Eapen ◽  
K A Balasubramanian ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Fatty Acid ◽  
Fatty Liver ◽  
Fatty Acid Oxidation ◽  
Acid Oxidation ◽  
Maternal Circulation ◽  
Subcellular Organelles ◽  
Microvesicular Steatosis ◽  
Acute Fatty Liver ◽  
And Oxidative Stress

Acute fatty liver of pregnancy (AFLP), characterized by hepatic microvesicular steatosis, is a sudden catastrophic illness occurring almost exclusively in the third trimester of pregnancy. Defective fatty acid oxidation in the fetus has been shown to be associated with this disease. Since the placenta has the same genetic makeup as the fetus and as AFLP patients generally recover following delivery, we hypothesized that the placenta might be involved in pathogenesis of this disease. In an animal model of hepatic microvesicular steatosis (using sodium valproate), we found that microvesicular steatosis results in mitochondrial structural alterations and oxidative stress in subcellular organelles of the liver. In placentas from patients with AFLP, we observed placental mitochondrial dysfunction and oxidative stress in subcellular organelles. In addition, defective placental fatty acid oxidation results in accumulation of toxic mediators such as arachidonic acid. Escape of these mediators into the maternal circulation might affect the maternal liver resulting in microvesicular steatosis.

scholarly journals Unbalanced biotransformation metabolism and oxidative stress status: implications for deficient fatty acid oxidation

Health ◽  
2011 ◽  
Vol 03 (01) ◽  
pp. 43-48
Author(s):  
Catharina M. Mels ◽  
Francois H. Van der Westhuizen ◽  
Pieter J. Pretorius ◽  
Elardus Erasmus
Keyword(s):  
Oxidative Stress ◽  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Acid Oxidation ◽  
Oxidative Stress Status ◽  
And Oxidative Stress

scholarly journals The Role of Mitochondria in Sex-Dependent Differences in Hepatic Steatosis and Oxidative Stress in Response to Cafeteria Diet-Induced Obesity in Mice

Nutrients ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1618
Author(s):  
Juliana Morais Mewes ◽  
Fabiana Rodrigues Silva Gasparin ◽  
Tiago Yoshida ◽  
Mariana Amâncio Daniel da Silva ◽  
Maria Raquel Marçal Natali ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Fatty Acid ◽  
Er Stress ◽  
Fatty Acid Oxidation ◽  
Liver Steatosis ◽  
Cafeteria Diet ◽  
Acid Oxidation ◽  
Standard Diet ◽  
Mitochondrial Energy Metabolism ◽  
And Oxidative Stress

Female mice fed a cafeteria diet (FCaf) develop higher liver steatosis and oxidative stress than males (MCaf) as a consequence of unresolved ER stress. Here, we investigated whether mitochondria play a role in this sex difference. The isolated mitochondria from FCaf showed more signs of oxidative stress than those of MCaf, correlated with a reduced content of GSH, increased amount of reactive oxygen species (ROS), and lower activities of enzymes involved in ROS neutralisation. Mitochondria from FCaf and MCaf livers exhibited lower rates of succinate-driven state III respiration and reduced ATPase activity in intact coupled mitochondria compared to their controls fed a standard diet (FC and MC), with no differences between the sexes. Fatty acid oxidation in mitochondria and peroxisomes was higher in MCaf and FCaf compared to their respective controls. In the intact perfused liver, there was no difference between sex or diet regarding the fatty acid oxidation rate. These results indicated that cafeteria diet did not affect mitochondrial energy metabolism, even in FCaf livers, which have higher steatosis and cellular oxidative stress. Nevertheless, the increase in mitochondrial ROS generation associated with a decrease in the antioxidant defence capacity, probably contributes to inducing or reinforcing the ER stress in FCaf livers.

scholarly journals Interleukin-6 Increases Insulin-Stimulated Glucose Disposal in Humans and Glucose Uptake and Fatty Acid Oxidation In Vitro via AMP-Activated Protein Kinase

Diabetes ◽  
2006 ◽  
Vol 55 (10) ◽  
pp. 2688-2697 ◽  
Author(s):  
A. L. Carey ◽  
G. R. Steinberg ◽  
S. L. Macaulay ◽  
W. G. Thomas ◽  
A. G. Holmes ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Protein Kinase ◽  
Glucose Uptake ◽  
Fatty Acid Oxidation ◽  
Interleukin 6 ◽  
Glucose Disposal ◽  
Acid Oxidation ◽  
Amp Activated Protein Kinase

II. Cytochrome P-450 enzymes and oxidative stress

2001 ◽  
Vol 281 (5) ◽  
pp. G1135-G1139 ◽  
Author(s):  
Graham Robertson ◽  
Isabelle Leclercq ◽  
Geoffrey C. Farrell
Keyword(s):  
Oxidative Stress ◽  
Fatty Acid ◽  
Molecular Oxygen ◽  
Hepatic Steatosis ◽  
Nonalcoholic Steatohepatitis ◽  
Acid Oxidation ◽  
Cellular Injury ◽  
Second Hit ◽  
Cytochrome P 450 ◽  
And Oxidative Stress

Oxidative stress is present in the liver of humans with steatosis and nonalcoholic steatohepatitis (NASH) and is a plausible mediator of cellular injury, inflammatory recruitment, and fibrogenesis. CYPs 2E1 and 4A are the microsomal oxidases involved with fatty acid oxidation. Both enzymes can reduce molecular oxygen to produce prooxidant species, which, if not countered efficiently by antioxidants, create oxidative stress. In this theme article, we present the evidence that, in the context of hepatic steatosis, CYPs 2E1 and 4A could generate the “second hit” of cellular injury, particularly when antioxidant reserves are depleted, and propose ways in which this could contribute to the pathogenesis of NASH.

scholarly journals MicroRNA-27b-3p regulates function and metabolism in insulin resistance cells by inhibiting receptor tyrosine kinase-like orphan receptor 1

2018 ◽  
Vol 16 ◽  
pp. 205873921876205
Author(s):  
Yong Liu ◽  
Guohui Wang ◽  
Xiangwu Yang ◽  
Pengzhou Li ◽  
Hao Ling ◽  
...  
Keyword(s):  
Insulin Resistance ◽  
Fatty Acid ◽  
Tyrosine Kinase ◽  
Glucose Uptake ◽  
Fatty Acid Oxidation ◽  
Receptor Tyrosine Kinase ◽  
Cell Model ◽  
Orphan Receptor ◽  
Acid Oxidation ◽  
Metabolism Disorder

Type 2 diabetes mellitus (T2DM) is associated with insulin resistance-induced lipid and glucose metabolism disorder. The study was aimed to explore the potential functional role of microRNA (miR)-27b-3p in T2DM, as well as underlying mechanisms. An insulin resistance cell model was induced in HepG2 cells and then expression of miR-27b-3p and receptor tyrosine kinase-like orphan receptor 1 (ROR1) was analyzed. The expression of miR-27b-3p was overexpressed or silenced, and the relationship between ROR1 and miR-27b-3p was investigated. Thereafter, the effects of miR-27b-3p on percentage of glucose uptake, fatty acid oxidation and cell cycle were analyzed. The expressions of miR-27b-3p were significantly increased, while the ROR1 levels were statistically decreased in the cells of the model group. Overexpression of miR-27b-3p dramatically decreased the levels of ROR1 and the percentage of glucose uptake, but had no effects on fatty acid oxidation. ROR1 was a target of miR-27b-3p. Moreover, overexpression of miR-27b-3p could remarkably highlight the percentages of cells at G0/G1 phase, but decreased the percentages of cells at S phase. In conclusion, our results suggest that miR-27b-3p regulates the function and metabolism of insulin resistance cells by inhibiting ROR1. miR-27b-3p might be a potential drug target in treating T2DM.

scholarly journals Acetylation and succinylation contribute to maturational alterations in energy metabolism in the newborn heart

2016 ◽  
Vol 311 (2) ◽  
pp. H347-H363 ◽  
Author(s):  
Arata Fukushima ◽  
Osama Abo Alrob ◽  
Liyan Zhang ◽  
Cory S. Wagg ◽  
Tariq Altamimi ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Energy Metabolism ◽  
Fatty Acid Oxidation ◽  
Glucose Oxidation ◽  
Acid Oxidation ◽  
Amino Acid Synthesis ◽  
Oxidation Rates ◽  
Cardiac Energy Metabolism ◽  
Cardiac Energy ◽  
The Impact

Dramatic maturational changes in cardiac energy metabolism occur in the newborn period, with a shift from glycolysis to fatty acid oxidation. Acetylation and succinylation of lysyl residues are novel posttranslational modifications involved in the control of cardiac energy metabolism. We investigated the impact of changes in protein acetylation/succinylation on the maturational changes in energy metabolism of 1-, 7-, and 21-day-old rabbit hearts. Cardiac fatty acid β-oxidation rates increased in 21-day vs. 1- and 7-day-old hearts, whereas glycolysis and glucose oxidation rates decreased in 21-day-old hearts. The fatty acid oxidation enzymes, long-chain acyl-CoA dehydrogenase (LCAD) and β-hydroxyacyl-CoA dehydrogenase (β-HAD), were hyperacetylated with maturation, positively correlated with their activities and fatty acid β-oxidation rates. This alteration was associated with increased expression of the mitochondrial acetyltransferase, general control of amino acid synthesis 5 like 1 (GCN5L1), since silencing GCN5L1 mRNA in H9c2 cells significantly reduced acetylation and activity of LCAD and β-HAD. An increase in mitochondrial ATP production rates with maturation was associated with the decreased acetylation of peroxisome proliferator-activated receptor-γ coactivator-1α, a transcriptional regulator for mitochondrial biogenesis. In addition, hypoxia-inducible factor-1α, hexokinase, and phosphoglycerate mutase expression declined postbirth, whereas acetylation of these glycolytic enzymes increased. Phosphorylation rather than acetylation of pyruvate dehydrogenase (PDH) increased in 21-day-old hearts, accounting for the low glucose oxidation postbirth. A maturational increase was also observed in succinylation of PDH and LCAD. Collectively, our data are the first suggesting that acetylation and succinylation of the key metabolic enzymes in newborn hearts play a crucial role in cardiac energy metabolism with maturation. Listen to this article’s corresponding podcast at http://ajpheart.podbean.com/e/acetylation-control-of-energy-metabolism-in-newborn-hearts/ .

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