Shh-Mediated Increase in β-Catenin Levels Maintains Cerebellar Granule Neuron Progenitors in Proliferation

Mani, S and Radhakrishnan, S and Cheramangalam, RN and Harkar, S and Rajendran, S and Ramanan, N (2020) Shh-Mediated Increase in β-Catenin Levels Maintains Cerebellar Granule Neuron Progenitors in Proliferation. In: Cerebellum, 19 (5). pp. 645-664.

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Abstract

Cerebellar granule neuron progenitors (CGNPs) give rise to the cerebellar granule neurons in the developing cerebellum. Generation of large number of these neurons is made possible by the high proliferation rate of CGNPs in the external granule layer (EGL) in the dorsal cerebellum. Here, we show that upregulation of β-catenin can maintain murine CGNPs in a state of proliferation. Further, we show that β-catenin mRNA and protein levels can be regulated by the mitogen Sonic hedgehog (Shh). Shh signaling led to an increase in the level of the transcription factor N-myc. N-myc was found to bind the β-catenin promoter, and the increase in β-catenin mRNA and protein levels could be prevented by blocking N-myc upregulation downstream of Shh signaling. Furthermore, blocking Wingless-type MMTV integration site (Wnt) signaling by Wnt signaling pathway inhibitor Dickkopf 1 (Dkk-1) in the presence of Shh did not prevent the upregulation of β-catenin. We propose that in culture, Shh signaling regulates β-catenin expression through N-myc and results in increased CGNP proliferation. © 2020, Springer Science+Business Media, LLC, part of Springer Nature.

Item Type:	Journal Article
Publication:	Cerebellum
Publisher:	Springer
Additional Information:	Copy right for this article belongs to Springer
Keywords:	Sonic hedgehog . Cerebellar granule neuron progenitors . β-Catenin . N-myc
Department/Centre:	Division of Biological Sciences > Centre for Neuroscience
Date Deposited:	17 Nov 2020 10:39
Last Modified:	17 Nov 2020 10:41
URI:	http://eprints.iisc.ac.in/id/eprint/65767

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