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In multiple sclerosis, successful remyelination within the injured CNS is largely dependent on the survival and differentiation of oligodendrocyte progenitor cells. During inflammatory injury, oligodendrocytes and oligodendrocyte progenitor cells within lesion sites are exposed to secreted products derived from both infiltrating immune cell subsets and CNS-resident cells. Such products may be considered either proinflammatory or anti-inflammatory and have the potential to contribute to both injury and repair processes. Within the CNS, astrocytes also contribute significantly to oligodendrocyte biology during development and following inflammatory injury. The overall objective of the current study was to determine how functionally distinct proinflammatory and anti-inflammatory human immune cell subsets, implicated in multiple sclerosis, can directly and/or indirectly (via astrocytes) impact human oligodendrocyte …