PubMed:15292179 JSONTXT

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    sentences

    {"project":"sentences","denotations":[{"id":"T1","span":{"begin":0,"end":124},"obj":"Sentence"},{"id":"T2","span":{"begin":125,"end":200},"obj":"Sentence"},{"id":"T3","span":{"begin":201,"end":311},"obj":"Sentence"},{"id":"T4","span":{"begin":312,"end":441},"obj":"Sentence"},{"id":"T5","span":{"begin":442,"end":616},"obj":"Sentence"},{"id":"T6","span":{"begin":617,"end":724},"obj":"Sentence"},{"id":"T7","span":{"begin":725,"end":844},"obj":"Sentence"},{"id":"T8","span":{"begin":845,"end":1053},"obj":"Sentence"},{"id":"T9","span":{"begin":1054,"end":1176},"obj":"Sentence"},{"id":"T10","span":{"begin":1177,"end":1235},"obj":"Sentence"},{"id":"T11","span":{"begin":1236,"end":1379},"obj":"Sentence"},{"id":"T12","span":{"begin":1380,"end":1546},"obj":"Sentence"},{"id":"T13","span":{"begin":1547,"end":1665},"obj":"Sentence"},{"id":"T14","span":{"begin":1666,"end":1817},"obj":"Sentence"}],"namespaces":[{"prefix":"_base","uri":"http://pubannotation.org/ontology/tao.owl#"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    Glycosmos6-MAT

    {"project":"Glycosmos6-MAT","denotations":[{"id":"T1","span":{"begin":188,"end":192},"obj":"http://purl.obolibrary.org/obo/MAT_0000135"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    2015-BEL-Sample

    {"project":"2015-BEL-Sample","denotations":[{"id":"T1","span":{"begin":738,"end":843},"obj":"path(MESHD:Hyperoxia) increases tloc(p(MGI:Nfe2l2),GOCCID:0005737,GOCCID:0005634)"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    2015-BEL-Sample-2

    {"project":"2015-BEL-Sample-2","denotations":[{"id":"BEL:20000586","span":{"begin":1266,"end":1318},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk1))"},{"id":"BEL:20000590","span":{"begin":1266,"end":1318},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk3))"},{"id":"BEL:20000598","span":{"begin":738,"end":843},"obj":"path(MESHD:Hyperoxia) increases tloc(p(MGI:Nfe2l2),GOCCID:0005737,GOCCID:0005634)"},{"id":"BEL:20000586","span":{"begin":1266,"end":1317},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk1))"},{"id":"BEL:20000590","span":{"begin":1266,"end":1317},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk3))"},{"id":"BEL:20000592","span":{"begin":668,"end":1816},"obj":"path(MESHD:Hyperoxia) increases p(MGI:Nfe2l2,pmod(P))"},{"id":"BEL:20000594","span":{"begin":0,"end":1664},"obj":"path(MESHD:Hyperoxia) increases p(MGI:Nfe2l2,pmod(P))"},{"id":"BEL:20040002","span":{"begin":164,"end":1765},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk1))"},{"id":"BEL:20040004","span":{"begin":0,"end":1603},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk3))"},{"id":"BEL:20040006","span":{"begin":164,"end":1765},"obj":"path(MESHD:Hyperoxia) increases kin(p(MGI:Mapk3))"},{"id":"BEL:20040022","span":{"begin":668,"end":1816},"obj":"path(MESHD:Hyperoxia) increases p(MGI:Nfe2l2,pmod(P,S))"},{"id":"BEL:20040024","span":{"begin":0,"end":1664},"obj":"path(MESHD:Hyperoxia) increases p(MGI:Nfe2l2,pmod(P,S))"},{"id":"BEL:20040034","span":{"begin":4,"end":1816},"obj":"path(MESHD:Hyperoxia) increases tloc(p(MGI:Nfe2l2),GOCCID:0005737,GOCCID:0005634)"},{"id":"BEL:20025006","span":{"begin":0,"end":1795},"obj":"a(CHEBI:\"reactive oxygen species\") increases tscript(p(MGI:Nfe2l2))"},{"id":"BEL:20040036","span":{"begin":738,"end":842},"obj":"path(MESHD:Hyperoxia) increases tloc(p(MGI:Nfe2l2),GOCCID:0005737,GOCCID:0005634)"},{"id":"BEL:20040038","span":{"begin":738,"end":842},"obj":"path(MESHD:Hyperoxia) increases tscript(p(MGI:Nfe2l2))"},{"id":"BEL:20038828","span":{"begin":0,"end":1603},"obj":"kin(p(MGI:Mapk3)) increases p(MGI:Nfe2l2,pmod(P,S))"},{"id":"BEL:20058112","span":{"begin":0,"end":1603},"obj":"p(MGI:Nfe2l2,pmod(P,S)) directlyIncreases tscript(p(MGI:Nfe2l2))"},{"id":"BEL:20077544","span":{"begin":0,"end":1816},"obj":"kin(p(HGNC:MAPK3)) increases tscript(p(HGNC:NFE2L2))"},{"id":"BEL:20078588","span":{"begin":164,"end":1765},"obj":"path(MESHD:Hyperoxia) increases kin(p(HGNC:MAPK1))"},{"id":"BEL:20078592","span":{"begin":164,"end":1765},"obj":"path(MESHD:Hyperoxia) increases kin(p(HGNC:MAPK3))"},{"id":"BEL:20078596","span":{"begin":0,"end":1816},"obj":"path(MESHD:Hyperoxia) increases kin(p(HGNC:MAPK3))"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    mondo_disease

    {"project":"mondo_disease","denotations":[{"id":"T1","span":{"begin":182,"end":199},"obj":"Disease"}],"attributes":[{"id":"A1","pred":"mondo_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MONDO_0006502"},{"id":"A2","pred":"mondo_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MONDO_0015796"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    Anatomy-MAT

    {"project":"Anatomy-MAT","denotations":[{"id":"T1","span":{"begin":188,"end":192},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"mat_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/MAT_0000135"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    GlyCosmos15-HP

    {"project":"GlyCosmos15-HP","denotations":[{"id":"T1","span":{"begin":125,"end":141},"obj":"Phenotype"}],"attributes":[{"id":"A1","pred":"hp_id","subj":"T1","obj":"HP:0025464"}],"namespaces":[{"prefix":"HP","uri":"http://purl.obolibrary.org/obo/HP_"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    NCBITAXON

    {"project":"NCBITAXON","denotations":[{"id":"T1","span":{"begin":231,"end":235},"obj":"OrganismTaxon"},{"id":"T2","span":{"begin":306,"end":310},"obj":"OrganismTaxon"}],"attributes":[{"id":"A1","pred":"db_id","subj":"T1","obj":"10088"},{"id":"A2","pred":"db_id","subj":"T2","obj":"10088"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    Anatomy-UBERON

    {"project":"Anatomy-UBERON","denotations":[{"id":"T1","span":{"begin":107,"end":123},"obj":"Body_part"},{"id":"T2","span":{"begin":188,"end":192},"obj":"Body_part"},{"id":"T3","span":{"begin":581,"end":605},"obj":"Body_part"},{"id":"T4","span":{"begin":790,"end":799},"obj":"Body_part"},{"id":"T5","span":{"begin":807,"end":814},"obj":"Body_part"},{"id":"T7","span":{"begin":1635,"end":1646},"obj":"Body_part"}],"attributes":[{"id":"A1","pred":"uberon_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/CL_0000066"},{"id":"A2","pred":"uberon_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/UBERON_0002048"},{"id":"A3","pred":"uberon_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/CL_0000322"},{"id":"A4","pred":"uberon_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/GO_0005737"},{"id":"A5","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/GO_0005634"},{"id":"A6","pred":"uberon_id","subj":"T5","obj":"http://purl.obolibrary.org/obo/UBERON_0000125"},{"id":"A7","pred":"uberon_id","subj":"T7","obj":"http://purl.obolibrary.org/obo/CL_0000057"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}

    Glycosmos15-CL

    {"project":"Glycosmos15-CL","denotations":[{"id":"T1","span":{"begin":107,"end":123},"obj":"Cell"},{"id":"T2","span":{"begin":581,"end":605},"obj":"Cell"},{"id":"T3","span":{"begin":590,"end":605},"obj":"Cell"},{"id":"T4","span":{"begin":1635,"end":1646},"obj":"Cell"}],"attributes":[{"id":"A1","pred":"cl_id","subj":"T1","obj":"http://purl.obolibrary.org/obo/CL:0000066"},{"id":"A2","pred":"cl_id","subj":"T2","obj":"http://purl.obolibrary.org/obo/CL:0000322"},{"id":"A3","pred":"cl_id","subj":"T3","obj":"http://purl.obolibrary.org/obo/CL:0000066"},{"id":"A4","pred":"cl_id","subj":"T4","obj":"http://purl.obolibrary.org/obo/CL:0000057"}],"text":"NADPH oxidase and ERK signaling regulates hyperoxia-induced Nrf2-ARE transcriptional response in pulmonary epithelial cells.\nOxidative stress plays a major role in hyperoxia-induced acute lung injury. We have shown previously that mice lacking the Nrf2 are more susceptible to hyperoxia than are wild-type mice. Nrf2 activates antioxidant response element (ARE)-mediated gene expression involved in cellular protection against toxic insults. The present study was designed to investigate the mechanisms that control the activation of Nrf2 by hyperoxia using a non-malignant murine alveolar epithelial cell line, C10. No significant alteration in the levels of Nrf2 mRNA and protein was found following exposure to hyperoxia. In contrast, hyperoxia caused the translocation of Nrf2 from the cytoplasm to the nucleus within 30-60 min of exposure. Consistent with these observations, gel shift and reporter analyses demonstrated a correlation between the hyperoxia-enhanced ARE DNA-binding activity of Nrf2 and an up-regulation of ARE-driven transcription. Inhibition of NADPH oxidase with diphenyleneiodonium (DPI) blocked both Nrf2 translocation and ARE-mediated transcription. Inhibition of the MEK/ERK pathway caused a similar effect. Consistent with this finding, hyperoxia stimulated ERK-1 and ERK-2 phosphorylation, whereas DPI or N-acetyl-l-cysteine blocked such activation. Hyperoxia stimulated the phosphorylation of endogenous Nrf2, but not in the presence of U0126, suggesting a critical role for ERK signaling in the activation of Nrf2. Consistent with this notion, hyperoxia did not stimulate the phosphorylation of Nrf2 in fibroblasts lacking the ERK-1. Collectively, our findings suggest that hyperoxia-induced, ARE-driven, Nrf2-dependent transcription is controlled by NADPH oxidase and ERK-1 signaling."}