Abstract
Prenatal glucocorticoid (GC) overexposure impacts fetal hippocampal neural stem cells (NSCs) and increases the risk for relative cognitive and mood disorders in offspring. However, the precise underlying mechanisms remain elusive. Here, we treated mouse hippocampal NSCs with dexamethasone (DEX) in vitro and found that DEX inhibited cell proliferation and Sirt7 expression. In addition, prenatal mouse overexposure to DEX induced the suppression of Sirt7 in the hippocampus of offspring. Sirt7 knockdown significantly decreased the percentage of proliferating cells but did not further reduce the NSC proliferation rate in the presence of DEX, whereas Sirt7 overexpression rescued DEX-induced inhibition of hippocampal NSC proliferation. Moreover, DEX inhibited Sirt7 expression through the glucocorticoid receptor (GR), and p21 was found to mediate the functional effect of DEX-induced Sirt7 suppression. In conclusion, our data demonstrate for the first time the effect of DEX on the Sirt7-p21 pathway in hippocampal NSCs, identifying a new potential therapeutic target for prenatal GC overexposure–related neurodevelopmental disorders in offspring.
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20 April 2021
A Correction to this paper has been published: https://doi.org/10.1007/s12640-021-00360-y
Abbreviations
- NSCs:
-
Neural stem cells
- DEX:
-
Dexamethasone
- DG:
-
Dentate gyrus
- GR:
-
Glucocorticoid receptor
- GC:
-
Glucocorticoid
- P3W:
-
Postnatal 3 week
- GREs:
-
GC-responsive elements
- CDK:
-
Cyclin-dependent kinase
- MR:
-
Mineralocorticoid receptor
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Funding
This work was supported by the National Natural Science Foundation of China (grants 81530042, 31830059, 31721003, 31871495, 31701110) and Fundamental Research Funds for the Central Universities (22120190149).
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Supplementary Figure 1.
Test of NSC proliferation by CFSE-based assay. (a) CFSE-based assay among DMSO- or DEX-treated NSCs. (b) CFSE-based assay in Sirt7-knockdown and control NSCs treated with DMSO or DEX. (c) CFSE-based assay in p21-knockdown and control NSCs treated with DMSO or DEX. (d) CFSE based-assay in shCtrl- or shSirt7 (shSirt7-1, shSirt7-2)-transfected NSCs following p21 knockdown. (e) CFSE-based assay in the DMSO+HA-Luc, DEX+HA-Luc, DEX+HA-SIRT7, DEX+HA-p21, and DEX+HA-SIRT7+HA-p21 groups. The data are shown as the mean ± SEM. Student’s t test. ***P<0.001. (JPG 706 kb)
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Alnoud, M.A.H., Chen, W., Liu, N. et al. Sirt7-p21 Signaling Pathway Mediates Glucocorticoid-Induced Inhibition of Mouse Neural Stem Cell Proliferation. Neurotox Res 39, 444–455 (2021). https://doi.org/10.1007/s12640-020-00294-x
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DOI: https://doi.org/10.1007/s12640-020-00294-x