Abstract
Bisphenol A (BPA) is an environmental xenoestrogenic endocrine disruptor, utilized for production of consumer products, and exerts adverse effects on the developing nervous system. Recently, we found that BPA impairs the finely tuned dynamic processes of neurogenesis (generation of new neurons) in the hippocampus of the developing rat brain. Curcumin is a natural polyphenolic compound, which provides neuroprotection against various environmental neurotoxicants and in the cellular and animal models of neurodegenerative disorders. Here, we have assessed the neuroprotective efficacy of curcumin against BPA-mediated reduced neurogenesis and the underlying cellular and molecular mechanism(s). Both in vitro and in vivo studies showed that curcumin protects against BPA-induced hippocampal neurotoxicity. Curcumin protects against BPA-mediated reduced neural stem cells (NSC) proliferation and neuronal differentiation and enhanced neurodegeneration. Curcumin also enhances the expression/levels of neurogenic and the Wnt pathway genes/proteins, which were reduced due to BPA exposure in the hippocampus. Curcumin-mediated neuroprotection against BPA-induced neurotoxicity involved activation of the Wnt/β-catenin signaling pathway, which was confirmed by the use of Wnt specific activators (LiCl and GSK-3β siRNA) and inhibitor (Dkk-1). BPA-mediated increased β-catenin phosphorylation, decreased GSK-3β levels, and β-catenin nuclear translocation were significantly reversed by curcumin, leading to enhanced neurogenesis. Curcumin-induced protective effects on neurogenesis were blocked by Dkk-1 in NSC culture treated with BPA. Curcumin-mediated enhanced neurogenesis was correlated well with improved learning and memory in BPA-treated rats. Overall, our results conclude that curcumin provides neuroprotection against BPA-mediated impaired neurogenesis via activation of the Wnt/β-catenin signaling pathway.
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Change history
28 June 2019
Correction to be published. The authors regret that inadvertent errors were observed in Fig.��3A, 5A&D and 8D. The corrected representative images are now incorporated. These corrections do not change the conclusions, text of the article and figure legends.
28 June 2019
Correction to be published. The authors regret that inadvertent errors were observed in Fig.��3A, 5A&D and 8D. The corrected representative images are now incorporated. These corrections do not change the conclusions, text of the article and figure legends.
Abbreviations
- BPA:
-
Bisphenol A
- NSC:
-
Neural stem cells
- NPC:
-
Neural progenitor cells
- HP:
-
Hippocampus
- SVZ:
-
Subventricular zone
- SGZ:
-
Subgranular zone
- AD:
-
Alzheimer’s disease
- PD:
-
Parkinson’s disease
- HD:
-
Huntington’s disease
- DCX:
-
Doublecortin
- GD:
-
Gestational day
- PND:
-
Postnatal day
- GFAP:
-
Glial fibrillary acidic protein
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Acknowledgments
Authors are thankful to Director, CSIR-IITR for support during the study. This work was supported by the CSIR Network Project BSC-0111 (InDepth) and the Indian Council of Medical Research (ICMR) project grant to R.K.C. S.K.T. and S.A. are recipients of a Senior Research Fellowship from University Grants Commission and Council of Scientific and Industrial Research, New Delhi, respectively. CSIR-IITR Manuscript Communication Number is 3291.
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The authors declare no competing financial interest.
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All the authors gave their consent, and experiments on the animals were approved by institutional ethical committee.
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Shashi Kant Tiwari and Swati Agarwal contributed equally to this work.
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Tiwari, S.K., Agarwal, S., Tripathi, A. et al. Bisphenol-A Mediated Inhibition of Hippocampal Neurogenesis Attenuated by Curcumin via Canonical Wnt Pathway. Mol Neurobiol 53, 3010–3029 (2016). https://doi.org/10.1007/s12035-015-9197-z
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DOI: https://doi.org/10.1007/s12035-015-9197-z