Ontology type: schema:ScholarlyArticle
2016-10
AUTHORSAlexandra M. Johnson, Ella Sugo, Daniela Barreto, Chee-Chung Hiew, John A. Lawson, Anne M. Connolly, Ernest Somerville, Enisa Hasic, Annie ME Bye, Anne M Cunningham
ABSTRACTAstrogliosis and microgliosis in hippocampal sclerosis (HS) are widespread and are postulated to contribute to the pro-excitatory neuropathological environment. This study aimed to establish if seizure burden at the time of surgery or post-surgical outcome were correlated with the extent of gliosis in HS. As a secondary aim, we wanted to determine if the degree of gliosis could be predicted by pre-operative neuroimaging.Children and adults who underwent epilepsy surgery for HS between 2002 and 2011 were recruited (n = 43), and age-matched autopsy controls obtained (n = 15). Temporal lobe specimens were examined by DAB immunohistochemistry for astrocytes (glial fibrillary acidic protein (GFAP)) and microglia (CD68). Cell counting for GFAP and CD68 was performed and quantitative densitometry undertaken for GFAP. Seizure variables and outcome (Engel) were determined through medical record and patient review. Seizure frequency in the 6 months prior to surgery was measured to reflect the acute seizure burden. Duration of seizures, age at onset and age at operation were regarded to reflect chronic seizure burden. Focal, lobar and generalized atrophy on pre-operative MRI were independently correlated with the degree of cortical gliosis in the surgical specimen.In HS, both acute and chronic seizure burden were positively correlated with the degree of gliosis. An increase in reactive astrocyte number in CA3 was the strongest predictor of poor post-operative seizure outcome at 1 and 3 years post-operatively in this cohort. Changes in lower cortical astrocyte and upper cortical microglial number also correlated with post-operative outcome at 1 year. Post-surgical seizure outcome (1, 3 and 5 years) did not otherwise correlate with GFAP immunoreactivity (GFAP-IR) or CD68 immunoreactivity (CD68-IR). Increased microglial activation was detected in patients with pre-operative bilateral convulsive seizures, compared to those without convulsive seizures. Furthermore, focal, lobar and generalized atrophy on pre-operative neuroimaging were independently correlated with the degree of cortical gliosis in the surgical specimen. More... »
PAGES5446-5456
http://scigraph.springernature.com/pub.10.1007/s12035-015-9465-y
DOIhttp://dx.doi.org/10.1007/s12035-015-9465-y
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/26452360
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