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Fructose Mediated Non-Alcoholic Fatty Liver Is Attenuated by HO-1-SIRT1 Module in Murine Hepatocytes and Mice Fed a High Fructose Diet.

Sodhi K, Puri N, Favero G, Stevens S, Meadows C, Abraham NG, Rezzani R, Ansinelli H, Lebovics E, Shapiro JI - PLoS ONE (2015)

Bottom Line: Fructose increased oxidative stress markers and decreased HO-1 and SIRT1 levels in hepatocytes (p<0.05).Increased levels of HO-1 increased SIRT1 levels and ameliorated fructose-mediated lipid accumulation and fibrosis in liver along with decreasing vascular dysfunction (p<0.05 vs. fructose).Taken together, our study demonstrates, for the first time, that HO-1 induction attenuates fructose-induced hepatic lipid deposition, prevents the development of hepatic fibrosis and abates NAFLD-associated vascular dysfunction; effects that are mediated by activation of SIRT1 gene expression.

View Article: PubMed Central - PubMed

Affiliation: Departments of Medicine and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia, United States of America.

ABSTRACT

Background: Oxidative stress underlies the etiopathogenesis of nonalcoholic fatty liver disease (NAFLD), obesity and cardiovascular disease (CVD). Heme Oxygenase-1 (HO-1) is a potent endogenous antioxidant gene that plays a key role in decreasing oxidative stress. Sirtuin1 (SIRT1) belongs to the family of NAD-dependent de-acyetylases and is modulated by cellular redox.

Hypothesis: We hypothesize that fructose-induced obesity creates an inflammatory and oxidative environment conducive to the development of NAFLD and metabolic syndrome. The aim of this study is to determine whether HO-1 acts through SIRT1 to form a functional module within hepatocytes to attenuate steatohepatitis, hepatic fibrosis and cardiovascular dysfunction.

Methods and results: We examined the effect of fructose, on hepatocyte lipid accumulation and fibrosis in murine hepatocytes and in mice fed a high fructose diet in the presence and absence of CoPP, an inducer of HO-1, and SnMP, an inhibitor of HO activity. Fructose increased oxidative stress markers and decreased HO-1 and SIRT1 levels in hepatocytes (p<0.05). Further fructose supplementation increased FAS, PPARα, pAMPK and triglycerides levels; CoPP negated this increase. Concurrent treatment with CoPP and SIRT1 siRNA in hepatocytes increased FAS, PPARα, pAMPK and triglycerides levels suggesting that HO-1 is upstream of SIRT1 and suppression of SIRT1 attenuates the beneficial effects of HO-1. A high fructose diet increased insulin resistance, blood pressure, markers of oxidative stress and lipogenesis along with fibrotic markers in mice (p<0.05). Increased levels of HO-1 increased SIRT1 levels and ameliorated fructose-mediated lipid accumulation and fibrosis in liver along with decreasing vascular dysfunction (p<0.05 vs. fructose). These beneficial effects of CoPP were reversed by SnMP.

Conclusion: Taken together, our study demonstrates, for the first time, that HO-1 induction attenuates fructose-induced hepatic lipid deposition, prevents the development of hepatic fibrosis and abates NAFLD-associated vascular dysfunction; effects that are mediated by activation of SIRT1 gene expression.

No MeSH data available.


Related in: MedlinePlus

Effect of induction of HO-1 (CoPP) and inhibition of HO (SnMP) on metabolic profile and hepatic lipid content in mice fed a high fructose diet for 8 weeks.(A) Blood pressure. (B) Fasting blood glucose levels. (C) HOMA-IR (D) Plasma ALT levels. (E) Triglycerides levels in hepatic tissue. (F) Cholesterol levels in hepatic tissue. Results are mean±SE, n = 6/group. * p<0.05 vs CTR; # p<0.05 vs HFr, + p<0.05 vs HFr+CoPP.
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pone.0128648.g003: Effect of induction of HO-1 (CoPP) and inhibition of HO (SnMP) on metabolic profile and hepatic lipid content in mice fed a high fructose diet for 8 weeks.(A) Blood pressure. (B) Fasting blood glucose levels. (C) HOMA-IR (D) Plasma ALT levels. (E) Triglycerides levels in hepatic tissue. (F) Cholesterol levels in hepatic tissue. Results are mean±SE, n = 6/group. * p<0.05 vs CTR; # p<0.05 vs HFr, + p<0.05 vs HFr+CoPP.

Mentions: A HFr diet increased blood pressure in mice compared to their control group, (p<0.05) (Fig 3A), an effect reversed via CoPP. Similarly our results showed that fasting blood glucose levels were increased in mice fed a HFr diet as compared to the control (Fig 3B; p<0.05). CoPP decreased blood glucose levels and concurrent treatment with SnMP reversed the beneficial effects of CoPP. Correspondingly, HOMA-IR was increased in mice fed a HFr diet as compared to the control mice (Fig 3C; p<0.05). CoPP significantly decreased HOMA-IR as compared to mice fed a HFr diet. Further ALT levels were significantly increased in mice fed HFr diet (Fig 3D) as compared to the control group and this increase was negated by treatment with CoPP. Furthermore, SnMP reversed the beneficial effect of CoPP and decreased ALT levels in plasma (p<0.01).


Fructose Mediated Non-Alcoholic Fatty Liver Is Attenuated by HO-1-SIRT1 Module in Murine Hepatocytes and Mice Fed a High Fructose Diet.

Sodhi K, Puri N, Favero G, Stevens S, Meadows C, Abraham NG, Rezzani R, Ansinelli H, Lebovics E, Shapiro JI - PLoS ONE (2015)

Effect of induction of HO-1 (CoPP) and inhibition of HO (SnMP) on metabolic profile and hepatic lipid content in mice fed a high fructose diet for 8 weeks.(A) Blood pressure. (B) Fasting blood glucose levels. (C) HOMA-IR (D) Plasma ALT levels. (E) Triglycerides levels in hepatic tissue. (F) Cholesterol levels in hepatic tissue. Results are mean±SE, n = 6/group. * p<0.05 vs CTR; # p<0.05 vs HFr, + p<0.05 vs HFr+CoPP.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4476565&req=5

pone.0128648.g003: Effect of induction of HO-1 (CoPP) and inhibition of HO (SnMP) on metabolic profile and hepatic lipid content in mice fed a high fructose diet for 8 weeks.(A) Blood pressure. (B) Fasting blood glucose levels. (C) HOMA-IR (D) Plasma ALT levels. (E) Triglycerides levels in hepatic tissue. (F) Cholesterol levels in hepatic tissue. Results are mean±SE, n = 6/group. * p<0.05 vs CTR; # p<0.05 vs HFr, + p<0.05 vs HFr+CoPP.
Mentions: A HFr diet increased blood pressure in mice compared to their control group, (p<0.05) (Fig 3A), an effect reversed via CoPP. Similarly our results showed that fasting blood glucose levels were increased in mice fed a HFr diet as compared to the control (Fig 3B; p<0.05). CoPP decreased blood glucose levels and concurrent treatment with SnMP reversed the beneficial effects of CoPP. Correspondingly, HOMA-IR was increased in mice fed a HFr diet as compared to the control mice (Fig 3C; p<0.05). CoPP significantly decreased HOMA-IR as compared to mice fed a HFr diet. Further ALT levels were significantly increased in mice fed HFr diet (Fig 3D) as compared to the control group and this increase was negated by treatment with CoPP. Furthermore, SnMP reversed the beneficial effect of CoPP and decreased ALT levels in plasma (p<0.01).

Bottom Line: Fructose increased oxidative stress markers and decreased HO-1 and SIRT1 levels in hepatocytes (p<0.05).Increased levels of HO-1 increased SIRT1 levels and ameliorated fructose-mediated lipid accumulation and fibrosis in liver along with decreasing vascular dysfunction (p<0.05 vs. fructose).Taken together, our study demonstrates, for the first time, that HO-1 induction attenuates fructose-induced hepatic lipid deposition, prevents the development of hepatic fibrosis and abates NAFLD-associated vascular dysfunction; effects that are mediated by activation of SIRT1 gene expression.

View Article: PubMed Central - PubMed

Affiliation: Departments of Medicine and Surgery, Joan C. Edwards School of Medicine, Marshall University, Huntington, West Virginia, United States of America.

ABSTRACT

Background: Oxidative stress underlies the etiopathogenesis of nonalcoholic fatty liver disease (NAFLD), obesity and cardiovascular disease (CVD). Heme Oxygenase-1 (HO-1) is a potent endogenous antioxidant gene that plays a key role in decreasing oxidative stress. Sirtuin1 (SIRT1) belongs to the family of NAD-dependent de-acyetylases and is modulated by cellular redox.

Hypothesis: We hypothesize that fructose-induced obesity creates an inflammatory and oxidative environment conducive to the development of NAFLD and metabolic syndrome. The aim of this study is to determine whether HO-1 acts through SIRT1 to form a functional module within hepatocytes to attenuate steatohepatitis, hepatic fibrosis and cardiovascular dysfunction.

Methods and results: We examined the effect of fructose, on hepatocyte lipid accumulation and fibrosis in murine hepatocytes and in mice fed a high fructose diet in the presence and absence of CoPP, an inducer of HO-1, and SnMP, an inhibitor of HO activity. Fructose increased oxidative stress markers and decreased HO-1 and SIRT1 levels in hepatocytes (p<0.05). Further fructose supplementation increased FAS, PPARα, pAMPK and triglycerides levels; CoPP negated this increase. Concurrent treatment with CoPP and SIRT1 siRNA in hepatocytes increased FAS, PPARα, pAMPK and triglycerides levels suggesting that HO-1 is upstream of SIRT1 and suppression of SIRT1 attenuates the beneficial effects of HO-1. A high fructose diet increased insulin resistance, blood pressure, markers of oxidative stress and lipogenesis along with fibrotic markers in mice (p<0.05). Increased levels of HO-1 increased SIRT1 levels and ameliorated fructose-mediated lipid accumulation and fibrosis in liver along with decreasing vascular dysfunction (p<0.05 vs. fructose). These beneficial effects of CoPP were reversed by SnMP.

Conclusion: Taken together, our study demonstrates, for the first time, that HO-1 induction attenuates fructose-induced hepatic lipid deposition, prevents the development of hepatic fibrosis and abates NAFLD-associated vascular dysfunction; effects that are mediated by activation of SIRT1 gene expression.

No MeSH data available.


Related in: MedlinePlus