Abstract
The Smoothened (Smo) receptor is a key transducer of the Sonic Hedgehog (Shh) signaling pathway in the brain. Recent studies in rodents have highlighted its major role in the maintenance of neural stem and progenitor cells in the two main neurogenic niches of the adult brain: the subventricular zone of the lateral ventricles and the subgranular zone of the dentate gyrus in the hippocampus. Smo may also regulate brain responses to various injuries, and its modulation in the primary cilia of brain cells is essential for regulating Shh signals. Recent clinical trials have underlined the therapeutic value of some Smo antagonists for the treatment of Hedgehog-linked medulloblastomas. Here, we review recent findings on the roles of Smo in the adult brain, and unravel research on the clinical implications for the treatment of brain diseases, that are increasingly under investigation.
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Abbreviations
- aNSC:
-
Activated neural stem cell
- AD:
-
Alzheimer’s disease
- APP:
-
Amyloid precursor protein
- CNS:
-
Central nervous system
- DG:
-
Dentate Gyrus
- Dhh:
-
Desert Hedgehog
- DS:
-
Down syndrome
- EGFR:
-
Epidermal growth factor receptor
- Gas1:
-
Growth arrest-specific 1 protein
- GCL:
-
Granular cell layer
- GCP:
-
Cerebellar granule cell precursor
- GDNF:
-
Glial cell line-derived neurotrophic factor
- GFAP:
-
Glial fibrillary acidic protein
- GLAST:
-
Astrocyte-specific glutamate transporter
- GPCR:
-
G-protein-coupled receptor
- Hh:
-
Hedgehog
- HIP:
-
Hedgehog-interacting protein
- Ihh:
-
Indian Hedgehog
- JS:
-
Joubert syndrome
- LPC:
-
Lysophosphatidyl choline
- LV:
-
Lateral ventricle
- MKS:
-
Meckel syndrome
- NG2:
-
Neuron-glial antigen 2
- NMDA:
-
N-methyl-d-aspartate
- NSC:
-
Neural stem cell
- OB:
-
Olfactory bulb
- OL:
-
Oligodendrocyte
- OPC:
-
Oligodendrocyte precursor cell
- PlGF:
-
Placental growth factor
- Ptc:
-
Patched
- qNSC:
-
Quiescent neural stem cell
- RMS:
-
Rostral migratory stream
- SGZ:
-
Subgranular zone
- Shh:
-
Sonic Hedgehog
- ShhN:
-
Aminoterminal fragment of Shh
- Smo:
-
Smoothened
- Sufu:
-
Suppressor of fused
- SVZ:
-
Subventricular zone
- TAC:
-
Transit-amplifying cell
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Ruat, M., Faure, H., Daynac, M. (2014). Smoothened, Stem Cell Maintenance and Brain Diseases. In: Ruat, M. (eds) The Smoothened Receptor in Cancer and Regenerative Medicine. Topics in Medicinal Chemistry, vol 16. Springer, Cham. https://doi.org/10.1007/7355_2014_83
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