Leptin Induces Oxidative Stress Through Activation of NADPH Oxidase in Renal Tubular Cells: Antioxidant Effect of L-Carnitine

ABSTRACT Leptin is a protein involved in the regulation of food intake and in the immune and inflammatory responses, among other functions. Evidences demonstrate that obesity is directly associated with high levels of leptin, suggesting that leptin may directly link obesity with the elevated cardiov...

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Veröffentlicht in:Journal of cellular biochemistry 2016-10, Vol.117 (10), p.2281-2288
Hauptverfasser: Blanca, Antonio J., Ruiz-Armenta, María V., Zambrano, Sonia, Salsoso, Rocío, Miguel-Carrasco, José L., Fortuño, Ana, Revilla, Elisa, Mate, Alfonso, Vázquez, Carmen M.
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container_issue 10
container_start_page 2281
container_title Journal of cellular biochemistry
container_volume 117
creator Blanca, Antonio J.
Ruiz-Armenta, María V.
Zambrano, Sonia
Salsoso, Rocío
Miguel-Carrasco, José L.
Fortuño, Ana
Revilla, Elisa
Mate, Alfonso
Vázquez, Carmen M.
description ABSTRACT Leptin is a protein involved in the regulation of food intake and in the immune and inflammatory responses, among other functions. Evidences demonstrate that obesity is directly associated with high levels of leptin, suggesting that leptin may directly link obesity with the elevated cardiovascular and renal risk associated with increased body weight. Adverse effects of leptin include oxidative stress mediated by activation of NADPH oxidase. The aim of this study was to evaluate the effect of L‐carnitine (LC) in rat renal epithelial cells (NRK‐52E) exposed to leptin in order to generate a state of oxidative stress characteristic of obesity. Leptin increased superoxide anion (O2•−) generation from NADPH oxidase (via PI3 K/Akt pathway), NOX2 expression and nitrotyrosine levels. On the other hand, NOX4 expression and hydrogen peroxide (H2O2) levels diminished after leptin treatment. Furthermore, the expression of antioxidant enzymes, catalase, and superoxide dismutase, was altered by leptin, and an increase in the mRNA expression of pro‐inflammatory factors was also found in leptin‐treated cells. LC restored all changes induced by leptin to those levels found in untreated cells. In conclusion, stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. Interestingly, LC induced an upregulation of NOX4 and restored the release of its product, hydrogen peroxide, which suggests a protective role of NOX4 against leptin‐induced renal damage. J. Cell. Biochem. 117: 2281–2288, 2016. © 2016 Wiley Periodicals, Inc. Stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. Interestingly, LC induced an upregulation of NOX4 and restored the release of its product, hydrogen peroxide, which suggests a protective role of NOX4 against leptin‐induced renal damage.
doi_str_mv 10.1002/jcb.25526
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Evidences demonstrate that obesity is directly associated with high levels of leptin, suggesting that leptin may directly link obesity with the elevated cardiovascular and renal risk associated with increased body weight. Adverse effects of leptin include oxidative stress mediated by activation of NADPH oxidase. The aim of this study was to evaluate the effect of L‐carnitine (LC) in rat renal epithelial cells (NRK‐52E) exposed to leptin in order to generate a state of oxidative stress characteristic of obesity. Leptin increased superoxide anion (O2•−) generation from NADPH oxidase (via PI3 K/Akt pathway), NOX2 expression and nitrotyrosine levels. On the other hand, NOX4 expression and hydrogen peroxide (H2O2) levels diminished after leptin treatment. Furthermore, the expression of antioxidant enzymes, catalase, and superoxide dismutase, was altered by leptin, and an increase in the mRNA expression of pro‐inflammatory factors was also found in leptin‐treated cells. 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Cell. Biochem</addtitle><description>ABSTRACT Leptin is a protein involved in the regulation of food intake and in the immune and inflammatory responses, among other functions. Evidences demonstrate that obesity is directly associated with high levels of leptin, suggesting that leptin may directly link obesity with the elevated cardiovascular and renal risk associated with increased body weight. Adverse effects of leptin include oxidative stress mediated by activation of NADPH oxidase. The aim of this study was to evaluate the effect of L‐carnitine (LC) in rat renal epithelial cells (NRK‐52E) exposed to leptin in order to generate a state of oxidative stress characteristic of obesity. Leptin increased superoxide anion (O2•−) generation from NADPH oxidase (via PI3 K/Akt pathway), NOX2 expression and nitrotyrosine levels. On the other hand, NOX4 expression and hydrogen peroxide (H2O2) levels diminished after leptin treatment. Furthermore, the expression of antioxidant enzymes, catalase, and superoxide dismutase, was altered by leptin, and an increase in the mRNA expression of pro‐inflammatory factors was also found in leptin‐treated cells. LC restored all changes induced by leptin to those levels found in untreated cells. In conclusion, stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. Interestingly, LC induced an upregulation of NOX4 and restored the release of its product, hydrogen peroxide, which suggests a protective role of NOX4 against leptin‐induced renal damage. J. Cell. Biochem. 117: 2281–2288, 2016. © 2016 Wiley Periodicals, Inc. Stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. 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Cell. Biochem</addtitle><date>2016-10</date><risdate>2016</risdate><volume>117</volume><issue>10</issue><spage>2281</spage><epage>2288</epage><pages>2281-2288</pages><issn>0730-2312</issn><eissn>1097-4644</eissn><abstract>ABSTRACT Leptin is a protein involved in the regulation of food intake and in the immune and inflammatory responses, among other functions. Evidences demonstrate that obesity is directly associated with high levels of leptin, suggesting that leptin may directly link obesity with the elevated cardiovascular and renal risk associated with increased body weight. Adverse effects of leptin include oxidative stress mediated by activation of NADPH oxidase. The aim of this study was to evaluate the effect of L‐carnitine (LC) in rat renal epithelial cells (NRK‐52E) exposed to leptin in order to generate a state of oxidative stress characteristic of obesity. Leptin increased superoxide anion (O2•−) generation from NADPH oxidase (via PI3 K/Akt pathway), NOX2 expression and nitrotyrosine levels. On the other hand, NOX4 expression and hydrogen peroxide (H2O2) levels diminished after leptin treatment. Furthermore, the expression of antioxidant enzymes, catalase, and superoxide dismutase, was altered by leptin, and an increase in the mRNA expression of pro‐inflammatory factors was also found in leptin‐treated cells. LC restored all changes induced by leptin to those levels found in untreated cells. In conclusion, stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. Interestingly, LC induced an upregulation of NOX4 and restored the release of its product, hydrogen peroxide, which suggests a protective role of NOX4 against leptin‐induced renal damage. J. Cell. Biochem. 117: 2281–2288, 2016. © 2016 Wiley Periodicals, Inc. Stimulation of NRK‐52E cells with leptin induced a state of oxidative stress and inflammation that could be reversed by preincubation with LC. Interestingly, LC induced an upregulation of NOX4 and restored the release of its product, hydrogen peroxide, which suggests a protective role of NOX4 against leptin‐induced renal damage.</abstract><cop>United States</cop><pub>Blackwell Publishing Ltd</pub><pmid>26918530</pmid><doi>10.1002/jcb.25526</doi><tpages>8</tpages></addata></record>
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source MEDLINE; Wiley Online Library Journals Frontfile Complete
subjects Animals
Antioxidants - pharmacology
Blotting, Western
Carnitine - pharmacology
Cells, Cultured
Enzyme Activation
Humans
Kidney
Kidney Tubules, Proximal - drug effects
Kidney Tubules, Proximal - metabolism
Kidney Tubules, Proximal - pathology
L-CARNITINE
LEPTIN
Leptin - toxicity
NADPH OXIDASE
NADPH Oxidases - genetics
NADPH Oxidases - metabolism
OXIDATIVE STRESS
Oxidative Stress - drug effects
Protective Agents - pharmacology
Rats
Real-Time Polymerase Chain Reaction
Reverse Transcriptase Polymerase Chain Reaction
RNA, Messenger - genetics
Superoxides - metabolism
title Leptin Induces Oxidative Stress Through Activation of NADPH Oxidase in Renal Tubular Cells: Antioxidant Effect of L-Carnitine
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