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Int J Biol Sci 2015; 11(10):1215-1225. doi:10.7150/ijbs.10516

Research Paper

Toxoplasma gondii Rhoptry Protein ROP16 Mediates Partially SH-SY5Y Cells Apoptosis and Cell Cycle Arrest by Directing Ser15/37 Phosphorylation of p53

Shuang Chang1, Xiumei Shan1, Xingliang Li1, Weiwei Fan1, Steven Qian Zhang1, Jin Zhang2, Nan Jiang2, Duan Ma2✉, Zuohua Mao1✉

1. Department of Parasitology and Microbiology, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China
2. Key Laboratory of Molecular Medicine, Ministry of Education, Department of Biochemistry and Molecular Biology, Institutes of Biomedical Sciences, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, China

Abstract

Toxoplasma rhoptries, an unusual set of apical organelles that are associated with Toxoplasma infection may cause subversion of the host cell functions. Parasite rhoptry protein 16 (ROP16) is a regulator of host cell transcription during cell invasion in which it migrates into the host cell cytoplasm and subsequently localizes to the nucleus. In the present study, we found that overexpression of ROP16 could partially mediate human neuroblastoma SH-SY5Y apoptosis (12.47%) and cell cycle arrest in G1 phase (60.77%) in a p53 dependent manner by influencing the expression of Bax/Bcl-2 and p21/CDKs. ROP16 was identified to co-localize with p53, a novel direct interaction partner in the nucleus of SH-SY5Y. Furthermore, SH-SY5Y apoptosis via the mitochondria-dependent p53 pathway and cell cycle arrest caused by ROP16 dealt with direct serine 15/37 phosphorylation of p53. Our studies provide a new mechanism by which ROP16 interacts with the nucleus proteins which subsequently subverts the host cells functions.

Keywords: Toxoplasma rhoptries, Parasite rhoptry protein 16

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How to cite this article:
Chang S, Shan X, Li X, Fan W, Zhang SQ, Zhang J, Jiang N, Ma D, Mao Z. Toxoplasma gondii Rhoptry Protein ROP16 Mediates Partially SH-SY5Y Cells Apoptosis and Cell Cycle Arrest by Directing Ser15/37 Phosphorylation of p53. Int J Biol Sci 2015; 11(10):1215-1225. doi:10.7150/ijbs.10516. Available from http://www.ijbs.com/v11p1215.htm