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Time-Course of Changes in Phosphorylated CREB in Neuroblasts and BDNF in the Mouse Dentate Gyrus at Early Postnatal Stages

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Abstract

Cyclic AMP (cAMP) response element-binding protein (CREB) is involved in memory, learning, and synaptic transmission. In this study, we observed changes of phosphorylated CREB (pCREB) immunoreactivity and its protein levels as well as brain-derived neurotrophic factor (BDNF) levels in the hippocampal dentate gyrus at postnatal (P) 1, 7, 14, and 21 in mice. In addition, we also investigated pCREB expression in doublecortin (DCX, a marker for neuronal progenitors) immunoreactive neuroblasts at P21. pCREB immunoreaction at P1 was detected in most of cells in the dentate gyrus, thereafter pCREB immunoreactivity was decreased in all the layers of the dentate gyrus with time, however, strong pCREB immunoreactivity was shown in cells confined to the subgranular zone of the dentate gyrus at P21. In this group, many pCREB immunoreactive cells were co-localized with DCX immunoreactive neuroblasts. In addition, pCREB protein levels were decreased with age, showing that their levels were very low at P21, while BDNF protein levels were increased with age. These results suggest that pCREB may play important roles in functional maturity of granule cells in mice.

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Acknowledgments

The authors would like to thank Mr. Seung Uk Lee and Mrs. Hyun Sook Kim for their technical help in this study. This research was supported by the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2010-0010580), and by the Regional Core Research Program funded by the Korea Ministry of Education, Science and Technology (Medical & Bio-material Research Center).

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Correspondence to Moo-Ho Won.

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In Koo Hwang and Ki-Yeon Yoo contributed equally to this article.

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Hwang, I.K., Yoo, KY., Yoo, D.Y. et al. Time-Course of Changes in Phosphorylated CREB in Neuroblasts and BDNF in the Mouse Dentate Gyrus at Early Postnatal Stages. Cell Mol Neurobiol 31, 669–674 (2011). https://doi.org/10.1007/s10571-011-9686-1

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