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Plastic changes in the anterior cingulate cortex (ACC) are critical in the pathogenesis of pain hypersensitivity caused by injury to peripheral nerves. Cdh1, a co-activator subunit of anaphase-promoting complex/cyclosome (APC/C) regulates synaptic differentiation and transmission. Based on this, we hypothesised that the APC/C-Cdh1 played an important role in long-term plastic changes induced by neuropathic pain in ACC.
Evidence has shown that stromal cell-derived factor (SDF-1/CXCL12) plays an important role in maintaining adult neural progenitor cells (NPCs). SDF-1 is also known to enhance recovery by recruiting NPCs to damaged regions and recent studies have revealed that SDF-1α exhibits pleiotropism, thereby differentially affecting NPC subpopulations. In this study, we investigated the role of SDF-1 in in vitro NPC self-renewal, proliferation and differentiation, following treatment with different concentrations of SDF-1 or a CXCR4 antagonist, AMD3100. We observed that AMD3100 inhibited the formation of primary neurospheres. However, SDF-1 and AMD3100 exhibited no effect on proliferation upon inclusion of growth factors in the media. Following growth factor withdrawal, AMD3100 and SDF-1 treatment resulted in differential effects on NPC proliferation. SDF-1, at a concentration of 500ng/ml, resulted in an increase in the relative proportion of oligodendrocytes following growth factor withdrawal-induced differentiation. Using CXCR4 knockout mice, we observed that SDF-1 affected NPC proliferation in the sub-ventricular zone (SVZ). We also investigated the occurrence of differential CXCR4 expression at different stages during lineage progression. These results clearly indicate that signaling interactions between SDF-1 and CXCR4 play an important role in adult SVZ lineage cell proliferation and differentiation.
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