Abstract
Traumatic brain injury (TBI) causes cerebral vascular dysfunction. Most have assumed that it was the result of endothelial and/or smooth muscle alteration. No consideration, however, has been given to the possibility that the forces of injury may also damage the perivascular nerve network, thereby contributing to the observed abnormalities. To test this premise, we subjected rats to impact acceleration. At 6Â h, 24Â h and 7Â days post-TBI, cerebral basal arteries were removed and processed with antibody targeting protein gene product 9.5 (PGP-9.5), with parallel assessments of 5-hydroxytryptamine (5-HT) accumulation in the perivascular nerves. Additionally, Fluoro-Jade was also used as a marker of axonal degeneration. The perivascular nerve network revealed no abnormality in sham animals. However, by 6Â h post injury, Fluoro-Jade reactivity appeared in the perivascular regions, with the number of fibers increasing with time. By 24Â h post injury, a significant reduction in the perivascular 5-HT accumulation occurred, together with a reduction in PGP-9.5 fiber staining. At 7Â days, a recovery of the PGP-9.5 immunoreactivity occurred, however, it did not reach a control-like distribution. These studies suggest that neurogenic damage occurs following TBI and may be a contributor to some of the associated vascular abnormalities.
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The authors wish to thank Thomas Coburn, and Lynn Davis for their skilled technical assistance. Supported by NIIT grant NS 20193
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Ueda, Y., Walker, S.A. & Povlishock, J.T. Perivascular nerve damage in the cerebral circulation following traumatic brain injury. Acta Neuropathol 112, 85–94 (2006). https://doi.org/10.1007/s00401-005-0029-5
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DOI: https://doi.org/10.1007/s00401-005-0029-5