Abstract
Neuronal apoptosis is an important process of secondary brain injury which is induced by neurochemical signaling cascades after traumatic brain injury (TBI). Present study was designed to investigate whether FOS-like antigen 1 (Fra-1) is involved in the neuronal apoptosis. Western blot analysis and immunohistochemistry in a rat TBI model revealed a significant increase in the expression of Fra-1 in the ipsilateral brain cortex, which was in parallel with increase in the expression of active caspase-3. With immunofluorescence double-labeling, Fra-1 was colocalized with active caspase-3 and with NeuN, a neuronal marker. In an in vitro cell injury model, H2O2 exposure induced cell apoptosis and reduced cell viability and at the same time, a similar increased expression of active caspase-3, p53 and Fra-1 was found in PC12 cells. Down-regulation of Fra-1 through transfection with Fra-1 siRNA remarkably elevated cell viability, reduced the expression of active caspase-3 and p53, and decreased apoptosis of PC12 cells after H2O2 exposure. Taken together, present findings suggest that Fra-1 may be involved in the induction of neuronal apoptosis through up-regulating p53 signaling pathway and that this action may contribute to the secondary neuropathological process after TBI.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (81371367, 812713681), the Youth Program of National Natural Science Foundation of China (81401013), 333 High-level Talent Project in Jiangsu Province (BRA2014347), “Talent Innovation Fund” in Nantong University (CXZR201308), and Nantong Municipal Science and Technology Innovation and Demonstration Project Special Social Programs of 2013 (HS2013068).
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Xu, X., Jiang, R., Gong, P. et al. Up-regulation of FOS-like antigen 1 contributes to neuronal apoptosis in the cortex of rat following traumatic brain injury. Metab Brain Dis 33, 115–125 (2018). https://doi.org/10.1007/s11011-017-0129-7
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DOI: https://doi.org/10.1007/s11011-017-0129-7