Abstract
FOXO3a, as a forkhead transcription factor, can control cell cycle through transcriptionally down-regulating p27kip1 level, which is a key regulator of the mammalian cell cycle and a good candidate to regulate multiple aspects of neurogenesis. To elucidate their expression and function in nervous system lesion and repair, we performed an acute sciatic nerve crush model and studied differential expressions of Foxo3a and p27kip1 in lumbar dorsal root ganglia. Temporally, Foxo3a protein level was reduced 1 day after injury, and following Foxo3a down-regulation, p27kip1 mRNA and protein levels were also decreased after injury. Spatially, decreased levels of Foxo3a and p27kip1 were predominant in neurons and glial cells, which were regenerating axons and largely proliferated after injury, respectively. Together with previous reports, we hypothesized decreased levels of Foxo3a and p27kip1 in lumbar dorsal root ganglia were implicated in axonal regeneration and the proliferation of glial cells after sciatic nerve injury.
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Abbreviations
- CNS:
-
Central nervous system
- DRG:
-
Dorsal root ganglia
- FOXO:
-
Forkhead box class O
- CDK2:
-
Cyclin-dependent kinase 2
- PI3-K:
-
Phosphatidylinositol 3-kinase
- SGK:
-
Serum and glucocorticoid–induced kinase
- PAGE:
-
Polyacrylamide gel electrophoresis
- ECL:
-
Enhanced chemiluminescence system
- BSA:
-
Bovine serum albumin
- NeuN:
-
Neuronal nuclei
- PCNA:
-
Proliferating cell nuclear antigen
- GFAP:
-
Glial fibrillary acidic protein
- GAP-43:
-
Neuronal growth-associated protein-43
- RT-PCR:
-
Reverse transcriptase PCR
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
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Acknowledgments
This work was supported by the National Natural Scientific Foundation of China Grant (No. 30300099 and No. 30770488), Natural Scientific Foundation of Jiangsu Province Grant (No. BK2003035 and No. BK2006547), College and University Natural Scientific Research Programme of Jiangsu Province (No. 03KJB180109 and No. 04KJB320114), Technology Guidance Plan for Social Development of Jiangsu Province Grant (BS2004526), Health Project of Jiangsu Province (H200632), “Liu-Da-Ren-Cai-Gao-Feng” Financial Assistance of Jiangsu Province Grant (No. 2), Postgraduate Scientic Innovation Program of Jiangsu Province (No. CX08S_026Z).
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Youhua Wang and Yonghua Liu have contributed equally to this work.
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Wang, Y., Liu, Y., Chen, Y. et al. Peripheral Nerve Injury Induces Down-Regulation of Foxo3a and p27kip1 in Rat Dorsal Root Ganglia. Neurochem Res 34, 891–898 (2009). https://doi.org/10.1007/s11064-008-9849-8
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DOI: https://doi.org/10.1007/s11064-008-9849-8