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대한생화학·분자생물학회 Experimental and Molecular Medicine Experimental and Molecular Medicine 제45권 제3호
발행연도
2013.1
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Neurite outgrowth, a cell differentiation process involving membrane morphological changes, is critical for neuronal network and development. The membrane lipid, phosphatidylinositol (PI) 4,5-bisphosphate (PIP2), is a key regulator of many important cell surface events of membrane signaling, trafficking and dynamics. This lipid is produced mainly by the type I PI 4-phosphate 5-kinase (PIP5K) family members. In this study, we addressed whether PIP5Ka, an isoform of PIP5K, could have a role in neurite outgrowth induced by nerve growth factor (NGF). For this purpose, we knocked down PIP5Ka in PC12 rat pheochromocytoma cells by stable expression of PIP5Ka microRNA that significantly reduced PIP5Ka expression and PIP2level. Interestingly, NGF-induced neurite outgrowth was more prominent in PIP5Ka-knockdown (KD) cells than in control cells. Conversely, add-back of PIP5Ka into PIP5Ka KD cells abrogated the effect of NGF on neurite outgrowth. NGF treatment activated PI 3-kinase (PI3K)/Akt pathway, which seemed to be associated with reactive oxygen species generation. Similar to the changes in neurite outgrowth, the PI3K/Akt activation by NGF was potentiated by PIP5Ka KD, but was attenuated by the reintroduction of PIP5Ka. Moreover, exogenously applied PIP2 to PIP5Ka KD cells also suppressed Akt activation by NGF. Together, our results suggest that PIP5Ka acts as a negative regulator of NGF-induced neurite outgrowth by inhibiting PI3K/Akt signaling pathway in PC12 cells.

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