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Disruption of Nrf2 enhances upregulation of nuclear factor-kappaB activity, proinflammatory cytokines, and intercellular adhesion molecule-1 in the brain after traumatic brain injury.

Jin W, Wang H, Yan W, Xu L, Wang X, Zhao X, Yang X, Chen G, Ji Y - Mediators Inflamm. (2009)

Bottom Line: Enzyme-linked immunosorbent assays were performed to quantify the production of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), and interleukin-6 (IL-6).Immunohistochemistry staining experiments were performed to detect the expression of intercellular adhesion molecule-1 (ICAM-1).The results suggest that Nrf2 plays an important protective role in limiting the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China.

ABSTRACT
Inflammatory response plays an important role in the pathogenesis of secondary brain injury after traumatic brain injury (TBI). Nuclear factor erythroid 2-related factor 2 (Nrf2) is a key transcription factor that plays a crucial role in cytoprotection against inflammation. The present study investigated the role of Nrf2 in the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI. Wild-type Nrf2 (+/+) and Nrf2 (-/-)-deficient mice were subjected to a moderately severe weight-drop impact head injury. Electrophoretic mobility shift assays (EMSAs) were performed to analyze the activation of nuclear factor kappa B (NF-kappaB). Enzyme-linked immunosorbent assays were performed to quantify the production of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), and interleukin-6 (IL-6). Immunohistochemistry staining experiments were performed to detect the expression of intercellular adhesion molecule-1 (ICAM-1). Nrf2 (-/-) mice were shown to have more NF-kappaB activation, inflammatory cytokines TNF-alpha, IL-1beta and IL-6 production, and ICAM-1 expression in brain after TBI compared with their wild-type Nrf2 (+/+) counterparts. The results suggest that Nrf2 plays an important protective role in limiting the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI.

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Expression of ICAM-1 in the cortex of sham and injured Nrf2 (+/+) and Nrf2 (−/−) mice.Immunohistochemical staining for ICAM-1 was performed in the cortex tissue sections of Nrf2 (+/+) and Nrf2 (−/−) mice 24 hoursafter TBI. (a), (c) Sham-operated Nrf2 (+/+) and Nrf2 (−/−) mice showing few ICAM-1-immunostained cerebral microvessels. (b)Injured Nrf2 (+/+) mice showing increased number ofICAM-1 positive vessels. (d) Injured Nrf2 (−/−) mice showing larger increment in the number of ICAM-1 positive vessels comparedwith injured Nrf2 (+/+) mice. (e) Quantitative analysis showed that the number of ICAM-1positive vessels in brain was significantly increased after TBI and was greaterin Nrf2 (−/−) mice than in Nrf2 (+/+) mice. Datarepresents mean ± SEM (n = 5 per group). **P < .01 versus sham control of the same genotype. #P < .05 versus injured wild-type mice.
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fig4: Expression of ICAM-1 in the cortex of sham and injured Nrf2 (+/+) and Nrf2 (−/−) mice.Immunohistochemical staining for ICAM-1 was performed in the cortex tissue sections of Nrf2 (+/+) and Nrf2 (−/−) mice 24 hoursafter TBI. (a), (c) Sham-operated Nrf2 (+/+) and Nrf2 (−/−) mice showing few ICAM-1-immunostained cerebral microvessels. (b)Injured Nrf2 (+/+) mice showing increased number ofICAM-1 positive vessels. (d) Injured Nrf2 (−/−) mice showing larger increment in the number of ICAM-1 positive vessels comparedwith injured Nrf2 (+/+) mice. (e) Quantitative analysis showed that the number of ICAM-1positive vessels in brain was significantly increased after TBI and was greaterin Nrf2 (−/−) mice than in Nrf2 (+/+) mice. Datarepresents mean ± SEM (n = 5 per group). **P < .01 versus sham control of the same genotype. #P < .05 versus injured wild-type mice.

Mentions: For assessment of the expression of ICAM-A in the brain after TBI,immunohistochemical study for ICAM-1 was performed. As shown in Figure 4, fewICAM-1-immunostained cerebral microvessels were observed in sham-operated miceof both genotypes. At the 24 hours after TBI, the number of ICAM-1 positivevessels was significantly increased in the cortex of both Nrf2 (+/+) and Nrf2(−/−) mice. Nrf2 (−/−) mice showed larger increase in the number of ICAM-1positive vessels than their wild-typeNrf2 (+/+) littermates after TBI.


Disruption of Nrf2 enhances upregulation of nuclear factor-kappaB activity, proinflammatory cytokines, and intercellular adhesion molecule-1 in the brain after traumatic brain injury.

Jin W, Wang H, Yan W, Xu L, Wang X, Zhao X, Yang X, Chen G, Ji Y - Mediators Inflamm. (2009)

Expression of ICAM-1 in the cortex of sham and injured Nrf2 (+/+) and Nrf2 (−/−) mice.Immunohistochemical staining for ICAM-1 was performed in the cortex tissue sections of Nrf2 (+/+) and Nrf2 (−/−) mice 24 hoursafter TBI. (a), (c) Sham-operated Nrf2 (+/+) and Nrf2 (−/−) mice showing few ICAM-1-immunostained cerebral microvessels. (b)Injured Nrf2 (+/+) mice showing increased number ofICAM-1 positive vessels. (d) Injured Nrf2 (−/−) mice showing larger increment in the number of ICAM-1 positive vessels comparedwith injured Nrf2 (+/+) mice. (e) Quantitative analysis showed that the number of ICAM-1positive vessels in brain was significantly increased after TBI and was greaterin Nrf2 (−/−) mice than in Nrf2 (+/+) mice. Datarepresents mean ± SEM (n = 5 per group). **P < .01 versus sham control of the same genotype. #P < .05 versus injured wild-type mice.
© Copyright Policy - open-access
Related In: Results  -  Collection

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fig4: Expression of ICAM-1 in the cortex of sham and injured Nrf2 (+/+) and Nrf2 (−/−) mice.Immunohistochemical staining for ICAM-1 was performed in the cortex tissue sections of Nrf2 (+/+) and Nrf2 (−/−) mice 24 hoursafter TBI. (a), (c) Sham-operated Nrf2 (+/+) and Nrf2 (−/−) mice showing few ICAM-1-immunostained cerebral microvessels. (b)Injured Nrf2 (+/+) mice showing increased number ofICAM-1 positive vessels. (d) Injured Nrf2 (−/−) mice showing larger increment in the number of ICAM-1 positive vessels comparedwith injured Nrf2 (+/+) mice. (e) Quantitative analysis showed that the number of ICAM-1positive vessels in brain was significantly increased after TBI and was greaterin Nrf2 (−/−) mice than in Nrf2 (+/+) mice. Datarepresents mean ± SEM (n = 5 per group). **P < .01 versus sham control of the same genotype. #P < .05 versus injured wild-type mice.
Mentions: For assessment of the expression of ICAM-A in the brain after TBI,immunohistochemical study for ICAM-1 was performed. As shown in Figure 4, fewICAM-1-immunostained cerebral microvessels were observed in sham-operated miceof both genotypes. At the 24 hours after TBI, the number of ICAM-1 positivevessels was significantly increased in the cortex of both Nrf2 (+/+) and Nrf2(−/−) mice. Nrf2 (−/−) mice showed larger increase in the number of ICAM-1positive vessels than their wild-typeNrf2 (+/+) littermates after TBI.

Bottom Line: Enzyme-linked immunosorbent assays were performed to quantify the production of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), and interleukin-6 (IL-6).Immunohistochemistry staining experiments were performed to detect the expression of intercellular adhesion molecule-1 (ICAM-1).The results suggest that Nrf2 plays an important protective role in limiting the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu Province, China.

ABSTRACT
Inflammatory response plays an important role in the pathogenesis of secondary brain injury after traumatic brain injury (TBI). Nuclear factor erythroid 2-related factor 2 (Nrf2) is a key transcription factor that plays a crucial role in cytoprotection against inflammation. The present study investigated the role of Nrf2 in the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI. Wild-type Nrf2 (+/+) and Nrf2 (-/-)-deficient mice were subjected to a moderately severe weight-drop impact head injury. Electrophoretic mobility shift assays (EMSAs) were performed to analyze the activation of nuclear factor kappa B (NF-kappaB). Enzyme-linked immunosorbent assays were performed to quantify the production of tumor necrosis factor-alpha (TNF-alpha), interleukin-1beta (IL-1beta), and interleukin-6 (IL-6). Immunohistochemistry staining experiments were performed to detect the expression of intercellular adhesion molecule-1 (ICAM-1). Nrf2 (-/-) mice were shown to have more NF-kappaB activation, inflammatory cytokines TNF-alpha, IL-1beta and IL-6 production, and ICAM-1 expression in brain after TBI compared with their wild-type Nrf2 (+/+) counterparts. The results suggest that Nrf2 plays an important protective role in limiting the cerebral upregulation of NF-kappaB activity, proinflammatory cytokine, and ICAM-1 after TBI.

Show MeSH
Related in: MedlinePlus