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The molecular mechanisms that underlie the axonal damage that accompanies CNS inflammation are largely unknown. Here, we investigate the effects of immune cells on neuronal viability and axonal growth and show that conditioned media from myeloid lineage cells inhibit neurite outgrowth without causing apoptosis. Treatment with monocyte conditioned medium enhances myosin light chain phosphorylation in neurons and the neurite outgrowth inhibitory effect of myeloid lineage cells can be attenuated with the myosin II inhibitor blebbistatin. Our results suggest that in the context of CNS inflammation myeloid cells may limit axonal repair in the CNS via a myosin II-dependent mechanism.
Human microglia, monocyte-derived dendritic cells (DCs) and macrophages ex vivo express relatively higher levels of sphingosine-1-phosphate (S1P) receptor 1 (S1P1) mRNA as compared to other receptor subtypes. The S1P agonist FTY720 decreased ERK phosphorylation and induced myosin light chain (MLC) II phosphorylation only in macrophages and DCs. FTY720 inhibited IL-12p70 production (CD40L induced) by DCs and macrophages but not microglia (poly I:C induced). IL-10 production was increased in DCs and unaffected in other myeloid cells. Despite similar receptor expression patterns, the distinct myeloid cell populations present in the human CNS, under steady-state or inflammatory conditions, exhibit differential responses to FTY720.
Microglia provide immune surveillance within the brain and spinal cord. Various microglial morphologies include ramified, amoeboid, and pseudopodic. The link between form and function is not clear, especially for human adult microglia which are limited in availability for study. Here, we examined primary human microglia isolated from normal-appearing white matter. Pseudopodic and amoeboid microglia were effective phagocytes, taking up E. coli bioparticles using ruffled cell membrane sheets and retrograde transport. Pseudopodic and amoeboid microglia were more effective phagocytes as compared to ramified microglia or monocyte-derived dendritic cells. Thus, amoeboid and pseudopodic microglia may both be effective as brain scavengers.
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