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Inhibitor of DNA binding 2 promotes axonal growth through upregulation of Neurogenin2.
Experimental Neurology 2019 May 28
Manipulation of developmentally regulated genes presents a promising strategy to enhance the intrinsic growth capability of adult neurons. Inhibitor of DNA binding 2 (Id2), a negative regulator of bHLH transcriptional factors, promotes axonal growth after its forced expression in post-mitotic neurons. Neurogenin2 (Ngn2) is a neural specific bHLH factor which controls neuronal fate and drives neuronal differentiation during development. In this study, we investigated the mechanism of Id2 in promoting axonal growth and revealed that Ngn2 contributed to the growth-activating role of Id2 in neurons. Ngn2 expression was upregulated with increased Id2 activity by assessing RNA and protein levels. Forced expression of Id2 or Ngn2 in cortical neurons significantly promoted axonal growth with little effect on dendrites. Furthermore, knockdown of Ngn2 impaired the axonal growth promoting effect of Id2, implying that the effect of Id2 on axonal growth depends on Ngn2. These findings suggest that elevation of neuronal Ngn2 may be a new therapeutic strategy to stimulate axonal regeneration.
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