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Shang M, Xie Z, Tang Z, He L, Wang X, Wang C, Wu Y, Li Y, Zhao L, Lv Z, Wu Z, Huang Y, Yu X, Li X. Expression of Clonorchis sinensis GIIIsPLA 2 protein in baculovirus-infected insect cells and its overexpression facilitating epithelial-mesenchymal transition in Huh7 cells via AKT pathway. Parasitol Res 2017; 116:1307-1316. [PMID: 28220242 DOI: 10.1007/s00436-017-5409-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 02/12/2017] [Indexed: 12/29/2022]
Abstract
Although prior studies confirmed that group III secretory phospholipase A2 of Clonorchis sinensis (CsGIIIsPLA2) had stimulating effect on liver fibrosis by binding to LX-2 cells, large-scale expression of recombinant protein and its function in the progression of hepatoma are worth exploring. Because of high productivity and low lipopolysaccharides (LPS) in the Sf9-baculovirus expression system, we firstly used this system to express the coding region of CsGIIIsPLA2. The molecular weight of recombinant CsGIIIsPLA2 protein was about 34 kDa. Further investigation showed that most of the recombinant protein presented intracellular expression in Sf9 insect cell nucleus and could be detected only into cell debris, which made the protein purification and further functional study difficult. Therefore, to study the role of CsGIIIsPLA2 in hepatocellular carcinoma (HCC) progression, CsGIIIsPLA2 overexpression Huh7 cell model was applied. Cell proliferation, migration, and the expression level of epithelial-mesenchymal transition (EMT)-related molecules (E-cadherin, N-cadherin, α-catenin, Vimentin, p300, Snail, and Slug) along with possible mechanism were measured. The results indicated that CsGIIIsPLA2 overexpression not only inhibited cell proliferation and promoted migration and EMT but also enhanced the phosphorylation of AKT in HCC cells. In conclusion, this study supported that CsGIIIsPLA2 overexpression suppressed cell proliferation and induced EMT through the AKT pathway.
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Affiliation(s)
- Mei Shang
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Zhizhi Xie
- Department of Clinical Laboratory, Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Zeli Tang
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Lei He
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Department of Clinical Laboratory, Guangzhou Red Cross Hospital, Medical College, Jinan University, Guangzhou, 510060, People's Republic of China
| | - Xiaoyun Wang
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Caiqin Wang
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Yinjuan Wu
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Ye Li
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Lu Zhao
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Zhiyue Lv
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Zhongdao Wu
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Yan Huang
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Xinbing Yu
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China
| | - Xuerong Li
- Department of Parasitology, Zhongshan School of Medicine, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China. .,Key Laboratory for Tropical Diseases Control, Ministry of Education, Sun Yat-Sen University, Guangzhou, 510080, People's Republic of China.
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Liang P, He L, Yu J, Xie Z, Chen X, Mao Q, Liang C, Huang Y, Lu G, Yu X. Identification and characterization of a member of Rab subfamily, Rab8, from Clonorchis sinensis. Parasitol Res 2015; 114:1857-64. [PMID: 25773178 DOI: 10.1007/s00436-015-4372-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 02/04/2015] [Indexed: 10/23/2022]
Abstract
The Rabs act as a binary molecular switch that utilizes the conformational changes associated with the GTP/GDP cycle to elicit responses from target proteins. It regulates a broad spectrum of cellular processes including cell proliferation, cytoskeletal assembly, and intracellular membrane trafficking in eukaryotes. The Rab8 from Clonorchis sinensis (CsRab8) was composed of 199 amino acids. The deduced amino acid sequence shared above 50% identities with other species from trematode, tapeworm, mammal, insecta, nematode, and reptile, respectively. The homologous analysis of sequences showed the conservative domains: G1 box (GDSGVGKS), G2 box (T), G3 box (DTAG), G4 box (GNKCDL), and G5 box. In addition, the structure modeling had also shown other functional domains: GTP/Mg(2+) binding sites, switch I region, and switch II region. A phylogenic tree analysis indicated that the CsRab8 was clustered with the Rab from Schistosoma japonicum, and trematode and tapeworm came from the same branch, which was different from an evolutional branch built by other species, such as mammal animal, insecta, nematode, and reptile. The recombinant CsRab8 protein was expressed in Escherichia coli and the purified protein was a soluble molecule by 12% sodium dodecyl sulfate polyacrylamide gel electrophoresis analysis. CsRab8 was identified as a component of excretory/secretory products of C. sinensis by western blot analysis. The transcriptional level of CsRab8 at metacercaria stage was the highest at the four stages and higher by 56.49-folds than that at adult worm, 1.23-folds than that at excysted metacercaria, and 2.69-folds than that at egg stage. Immunohistochemical localization analysis showed that CsRab8 was specifically distributed in the tegument, vitellarium, eggs, and testicle of adult worms, and detected on the vitellarium and tegument of metacercaria. Combined with the results, CsRab8 is indispensable for survival and development of parasites, especially for regulating excretory/secretory products secretion.
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Affiliation(s)
- Pei Liang
- Department of Pathogen Biology, Hainan Medical College, Haikou, Hainan, 571199, China
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