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Proc Natl Acad Sci U S A
2023 Jun 06;12023:e2220037120. doi: 10.1073/pnas.2220037120.
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Calcium dynamics at the neural cell primary cilium regulate Hedgehog signaling-dependent neurogenesis in the embryonic neural tube.
Shim S
,
Goyal R
,
Panoutsopoulos AA
,
Balashova OA
,
Lee D
,
Borodinsky LN
.
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The balance between neural stem cell proliferation and neuronal differentiation is paramount for the appropriate development of the nervous system. Sonic hedgehog (Shh) is known to sequentially promote cell proliferation and specification of neuronal phenotypes, but the signaling mechanisms responsible for the developmental switch from mitogenic to neurogenic have remained unclear. Here, we show that Shh enhances Ca2+ activity at the neural cell primary cilium of developing Xenopus laevis embryos through Ca2+ influx via transient receptor potential cation channel subfamily C member 3 (TRPC3) and release from intracellular stores in a developmental stage-dependent manner. This ciliary Ca2+ activity in turn antagonizes canonical, proliferative Shh signaling in neural stem cells by down-regulating Sox2 expression and up-regulating expression of neurogenic genes, enabling neuronal differentiation. These discoveries indicate that the Shh-Ca2+-dependent switch in neural cell ciliary signaling triggers the switch in Shh action from canonical-mitogenic to neurogenic. The molecular mechanisms identified in this neurogenic signaling axis are potential targets for the treatment of brain tumors and neurodevelopmental disorders.
R01NS073055 HHS | NIH | National Institute of Neurological Disorders and Stroke (NINDS), R01NS105886 HHS | NIH | National Institute of Neurological Disorders and Stroke (NINDS), R01NS113859 HHS | NIH | National Institute of Neurological Disorders and Stroke (NINDS), R01 NS105886 NINDS NIH HHS , R01 NS113859 NINDS NIH HHS
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