Hyperglycemia-Induced reactive oxygen species toxicity to endothelial cells is dependent on paracrine mediators

Julia V. Busik, Susanne Mohr, Maria B. Grant

Research output: Contribution to journalArticle

193 Citations (Scopus)

Abstract

OBJECTIVE-This study determined the effects of high glucose exposure and cytokine treatment on generation of reactive oxygen species (ROS) and activation of inflammatory and apo- ptotic pathways in human retinal endothelial cells (HRECs). RESEARCH DESIGN AND METHODS-Glucose consumption of HRECs, human retinal pigment epithelial cells (HRPEs), and human Müller cells (HMCs) under elevated glucose conditions was measured and compared with cytokine treatment. Production of ROS in HRECs was examined using 5-(and-6)- chloromethyl-2',7'- dichlorodihydrofluorescein diacetate (CM- H2DCFDA), spin-trap electron paramagnetic resonance, and MitoTracker Red staining after high glucose and cytokine treatment. The activation of different signaling cascades, including the mitogen-activated protein kinase pathways, tyrosine phosphory- lation pathways, and apoptosis by high glucose and cytokines in HRECs, was determined. RESULTS-HRECs, in contrast to HRPEs and HMCs, did not increase glucose consumption in response to increasing glucose concentrations. Exposure of HRECs to 25 mmol/l glucose did not stimulate endogenous ROS production, activation of nuclear factor-κB (NF-κB), extracellular signal-related kinase (ERK), p38 and Jun NH 2-terminal kinase (JNK), tyrosine phosphorylation, interleukin (IL)-1β, or tumor necrosis factor-α (TNF-α) production and only slightly affected apoptotic cell death pathways compared with normal glucose (5 mmol/l). In marked contrast, exposure of HRECs to proinflammatory cytokines IL-ip or TNF-a increased glucose consumption, mitochondrial superoxide production, ERK and JNK phosphorylation, tyrosine phosphorylation, NF-κB activation, and caspase activation. CONCLUSIONS-Our in vitro results indicate that HRECs respond to cytokines rather than high glucose, suggesting that in vivo diabetes-related endothelial injury in the retina may be due to glucose-induced cytokine release by other retinal cells and not a direct effect of high glucose.

Original languageEnglish (US)
Pages (from-to)1952-1965
Number of pages14
JournalDiabetes
Volume57
Issue number7
DOIs
StatePublished - Jul 2008
Externally publishedYes

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Hyperglycemia
Reactive Oxygen Species
Endothelial Cells
Glucose
Cytokines
Phosphorylation
Retinal Pigments
Phosphotransferases
Tumor Necrosis Factor-alpha
Epithelial Cells
TYK2 Kinase
Interleukins
Electron Spin Resonance Spectroscopy
Caspases
Mitogen-Activated Protein Kinases
Interleukin-1
Superoxides
Protein-Tyrosine Kinases
Tyrosine
Retina

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism

Cite this

Hyperglycemia-Induced reactive oxygen species toxicity to endothelial cells is dependent on paracrine mediators. / Busik, Julia V.; Mohr, Susanne; Grant, Maria B.

In: Diabetes, Vol. 57, No. 7, 07.2008, p. 1952-1965.

Research output: Contribution to journalArticle

Busik, Julia V. ; Mohr, Susanne ; Grant, Maria B. / Hyperglycemia-Induced reactive oxygen species toxicity to endothelial cells is dependent on paracrine mediators. In: Diabetes. 2008 ; Vol. 57, No. 7. pp. 1952-1965.
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abstract = "OBJECTIVE-This study determined the effects of high glucose exposure and cytokine treatment on generation of reactive oxygen species (ROS) and activation of inflammatory and apo- ptotic pathways in human retinal endothelial cells (HRECs). RESEARCH DESIGN AND METHODS-Glucose consumption of HRECs, human retinal pigment epithelial cells (HRPEs), and human M{\"u}ller cells (HMCs) under elevated glucose conditions was measured and compared with cytokine treatment. Production of ROS in HRECs was examined using 5-(and-6)- chloromethyl-2',7'- dichlorodihydrofluorescein diacetate (CM- H2DCFDA), spin-trap electron paramagnetic resonance, and MitoTracker Red staining after high glucose and cytokine treatment. The activation of different signaling cascades, including the mitogen-activated protein kinase pathways, tyrosine phosphory- lation pathways, and apoptosis by high glucose and cytokines in HRECs, was determined. RESULTS-HRECs, in contrast to HRPEs and HMCs, did not increase glucose consumption in response to increasing glucose concentrations. Exposure of HRECs to 25 mmol/l glucose did not stimulate endogenous ROS production, activation of nuclear factor-κB (NF-κB), extracellular signal-related kinase (ERK), p38 and Jun NH 2-terminal kinase (JNK), tyrosine phosphorylation, interleukin (IL)-1β, or tumor necrosis factor-α (TNF-α) production and only slightly affected apoptotic cell death pathways compared with normal glucose (5 mmol/l). In marked contrast, exposure of HRECs to proinflammatory cytokines IL-ip or TNF-a increased glucose consumption, mitochondrial superoxide production, ERK and JNK phosphorylation, tyrosine phosphorylation, NF-κB activation, and caspase activation. CONCLUSIONS-Our in vitro results indicate that HRECs respond to cytokines rather than high glucose, suggesting that in vivo diabetes-related endothelial injury in the retina may be due to glucose-induced cytokine release by other retinal cells and not a direct effect of high glucose.",
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