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Minocycline reduces chronic microglial activation after brain trauma but increases neurodegeneration.

Artikel i vetenskaplig tidskrift
Författare Gregory Scott
Henrik Zetterberg
Amy Jolly
James H Cole
Sara De Simoni
Peter O Jenkins
Claire Feeney
David R Owen
Anne Lingford-Hughes
Oliver Howes
Maneesh C Patel
Anthony P Goldstone
Roger N Gunn
Kaj Blennow
Paul M Matthews
David J Sharp
Publicerad i Brain : a journal of neurology
Volym 141
Nummer/häfte 2
Sidor 459-471
ISSN 1460-2156
Publiceringsår 2018
Publicerad vid Institutionen för neurovetenskap och fysiologi, sektionen för psykiatri och neurokemi
Sidor 459-471
Språk en
Länkar dx.doi.org/10.1093/brain/awx339
www.ncbi.nlm.nih.gov/entrez/query.f...
Ämneskategorier Neurovetenskaper, Neurokemi

Sammanfattning

Survivors of a traumatic brain injury can deteriorate years later, developing brain atrophy and dementia. Traumatic brain injury triggers chronic microglial activation, but it is unclear whether this is harmful or beneficial. A successful chronic-phase treatment for traumatic brain injury might be to target microglia. In experimental models, the antibiotic minocycline inhibits microglial activation. We investigated the effect of minocycline on microglial activation and neurodegeneration using PET, MRI, and measurement of the axonal protein neurofilament light in plasma. Microglial activation was assessed using 11C-PBR28 PET. The relationships of microglial activation to measures of brain injury, and the effects of minocycline on disease progression, were assessed using structural and diffusion MRI, plasma neurofilament light, and cognitive assessment. Fifteen patients at least 6 months after a moderate-to-severe traumatic brain injury received either minocycline 100 mg orally twice daily or no drug, for 12 weeks. At baseline, 11C-PBR28 binding in patients was increased compared to controls in cerebral white matter and thalamus, and plasma neurofilament light levels were elevated. MRI measures of white matter damage were highest in areas of greater 11C-PBR28 binding. Minocycline reduced 11C-PBR28 binding (mean Δwhite matter binding = -23.30%, 95% confidence interval -40.9 to -5.64%, P = 0.018), but increased plasma neurofilament light levels. Faster rates of brain atrophy were found in patients with higher baseline neurofilament light levels. In this experimental medicine study, minocycline after traumatic brain injury reduced chronic microglial activation while increasing a marker of neurodegeneration. These findings suggest that microglial activation has a reparative effect in the chronic phase of traumatic brain injury.

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