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Hepatic nuclear factor κB regulates neutrophil recruitment to the injured brain

Lookup NU author(s): Professor Fiona Oakley, Dr Ahmed Elsharkawy, Professor Derek Mann

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Abstract

Acute brain injury is associated with induction of hepatic chemokine expression, which is an essential element in the subsequent recruitment of leukocytes to the damaged brain. To further understand the significance of the hepatic inflammatory response, we focused on nuclear factor (NF)-κB, a pivotal regulator of inflammation. Nondestructive real-time whole-body imaging was undertaken in the 3XNF-κB-luciferase mouse to monitor NF-κB activation. Acute brain injury induced by intracerebral injection of interleukin-1 provoked rapid activation of hepatic and CNS NF-κB, with only minimal changes in other organs. Elevated NF-κB in the brain was limited to the site of the lesion, whereas hepatic NF-κB was widespread. The function of NF-κB in this model was determined by monitoring leukocyte recruitment to the liver and brain of nfκb1 mice, which lack the anti-inflammatory p50:p50 NF-κB homodimer. Brain injury in the nfκb1 mice was associated with increased neutrophil recruitment to the liver and brain compared with wild-type mice, thereby confirming a regulatory role for the NF-κB system. To determine the role of hepatic NF-κB, it was selectively inhibited by intravenous adenoviral-mediated delivery of an IκBα super-repressor. This treatment significantly reduced the numbers of neutrophils recruited to the brain. In conclusion, acute brain injury is associated with rapid and robust activation of hepatic NF-κB, which is required for efficient mobilization of circulating leukocytes to the brain. © 2008 American Association of Neuropathologists, Inc.


Publication metadata

Author(s): Campbell SJ, Anthony DC, Oakley F, Carlsen H, Elsharkawy AM, Blomhoff R, Mann DA

Publication type: Article

Publication status: Published

Journal: Journal of Neuropathology and Experimental Neurology

Year: 2008

Volume: 67

Issue: 3

Pages: 223-230

ISSN (print): 0022-3069

ISSN (electronic): 1554-6578

Publisher: Lippincott Williams & Wilkins

URL: http://dx.doi.org/10.1097/NEN.0b013e3181654957

DOI: 10.1097/NEN.0b013e3181654957

PubMed id: 18344913


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