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We investigated CD45RA and CCR7 expression in CD4+ and CD8+ subsets of cerebrospinal fluid (CSF) lymphocytes, both immediately ex vivo and after stimulation, from 134 patients with a variety of inflammatory and non-inflammatory neurological diseases. Most inflammatory diseases had a higher CD4+:CD8+ ratio and higher percentage of effector memory T cells (T(EM)) than non-inflammatory controls, excluding active infection. Moreover, we found that patients with highly elevated cell counts in the CSF tended to have a lower percentage of central memory T cells (T(CM)) than patients with low or absent pleocytosis, with a concomitant increase in T(EM). We also found that samples with elevated IgG index or presence of oligoclonal bands had a significantly higher CD4+:CD8+ ratio than normal samples, consistent with increased CD4+ help for intrathecal IgG synthesis by B cells.
Pubmed ID: 22633193
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Automated benchtop flow cytometry system. It allows measuring four fluorochrome-conjugates, forward and side scatter.
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