Abstract
Sublytic complement C5b‐9 complexes can cause cell apoptosis, but the mechanism of glomerular mesangial cell (GMC) apoptosis mediated by these complexes has not been well defined. The activating transcription factor 3 (ATF3) gene is an immediate early gene for the cell to cope with a variety of stress signals and can promote apoptosis of some cells. In this study, ATF3 expression and cell apoptosis in GMCs induced by sublytic C5b‐9 were measured, and then the effects of ATF3 gene over‐expression or knockdown on GMC apoptosis induced by sublytic C5b‐9 were examined at a fixed time. The results showed that both ATF3 expression and GMC apoptosis were markedly increased and ATF3 over‐expression obviously increased sublytic C5b‐9‐induced GMC apoptosis, whereas ATF3 gene silencing had a significant opposite effect. Collectively, these findings indicate that upregulation of ATF3 gene expression is involved in regulating GMC apoptosis induced by sublytic C5b‐9 complexes.
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Acknowledgements
The authors thank Dr Jianmin Li (Nanjing Medical University, Nanjing, China) for providing the pcDNA3.1 plasmid. This work was supported by grants from the National Natural Science Foundations of China (No. 30772016), the Ministry of Education of China (No. 20060312005), and Jiangsu Provincial Department of Education (No. KJB310004) as well as Nanjing Medical University (No. 08NMUZ002 and No. 09JC007).
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Jiang, X., Zhang, J., Xia, M. et al. Role of activating transcription factor 3 (ATF3) in sublytic C5b‐9‐induced glomerular mesangial cell apoptosis. Cell Mol Immunol 7, 143–151 (2010). https://doi.org/10.1038/cmi.2009.109
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DOI: https://doi.org/10.1038/cmi.2009.109