Alternatively-spliced extra domain A of fibronectin promotes acute inflammation and brain injury after cerebral ischemia in mice.

Stroke; a Journal of Cerebral Circulation
Mohammad Moshahid KhanAnil K Chauhan

Abstract

The fibronectin isoform containing the alternatively spliced extra domain A (EDA(+)-FN) is normally absent from the circulation, but plasma levels of EDA(+)-FN can become markedly elevated in several human pathological conditions associated with inflammation including ischemic stroke. It remains unknown whether EDA(+)-FN contributes to stroke pathogenesis or is simply an associative marker. Several in vitro studies suggest that EDA(+)-FN can activate Toll-like receptor 4, an innate immune receptor that triggers proinflammatory responses. We undertook a genetic approach in mice to investigate the ability of EDA(+)-FN to mediate inflammatory brain damage in a focal cerebral ischemia/reperfusion injury model. We used genetically modified EDA(+/+) mice, which constitutively express EDA(+)-FN. Extent of injury, neurological outcome, and inflammatory mechanisms were assessed after 1-hour cerebral ischemia/23-hour reperfusion injury and compared with wild-type mice. We found that EDA(+/+) mice developed significantly larger infarcts and severe neurological deficits that were associated with significant increased neutrophil and macrophage infiltration as quantitated by immunohistochemistry. Additionally, we found upregulation of nuclea...Continue Reading

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