Spatiotemporal Pattern of Neuroinflammation After Impact-Acceleration Closed Head Injury in the Rat

Rooker, Servan; Jander, Sebastian; Reempts, Jos Van; Stoll, Guido; G. Jorens, Philippe; Borgers, Marcel; Verlooy, Jan

doi:https://doi.org/10.1155/MI/2006/90123

Mediators of Inflammation

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Research Communication | Open Access

Volume 2006 | Article ID 090123 | https://doi.org/10.1155/MI/2006/90123

Spatiotemporal Pattern of Neuroinflammation After Impact-Acceleration Closed Head Injury in the Rat

Servan Rooker,¹Sebastian Jander,²Jos Van Reempts,³Guido Stoll,^2,4Philippe G. Jorens,⁵Marcel Borgers,³and Jan Verlooy¹

Received21 Sept 2005

Accepted20 Oct 2005

Published08 Feb 2006

Abstract

Inflammatory processes have been implicated in the pathogenesis of traumatic brain damage. We analyzed the spatiotemporal expression pattern of the proinflammatory key molecules: interleukin-1β, interleukin-6, tumor necrosis factor-α, and inducible nitric oxide synthase in a rat closed head injury (CHI) paradigm. 51 rats were used for RT-PCR analysis after CHI, and 18 for immunocytochemistry. We found an early upregulation of IL-1β, IL-6, and TNF-α mRNA between 1 h and 7 h after injury; the expression of iNOS mRNA only revealed a significant increase at 4 h. After 24 h, the expression decreased towards baseline levels, and remained low until 7 d after injury. Immunocytochemically, IL-1β induction was localized to ramified microglia in areas surrounding the primary impact place as well as deeper brain structures. Our study shows rapid induction of inflammatory gene expression that exceeds by far the primary impact site and might therefore contribute to tissue damage at remote sites.

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Copyright © 2006 Servan Rooker et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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