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Jia Z, Liu H, Song M, Yang C, Zhao Y, Wu X, Wu Z, Zhao L. Effect of Intestinal Flora Clearance on Liver Proteomics in Mice. CURR PROTEOMICS 2019. [DOI: 10.2174/1570164616666181115102046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Intestinal flora dynamically affects the host's systemic immune system. Liver
is one of the organs that may be affected by intestinal microbiota.
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Materials and Methods: In this study, we aimed to identify proteome level differences between liver
tissue from mice cleared intestinal flora and control using tandem mass spectrometry (LC-MS/MS) and
label free quantification. Additionally, protein-protein interactions were mapped by STRING, and also,
the enrichment of inflammation-related signaling pathways and biological processes was identified using
GO and IPA network system. RT-PCR and Western blot were used for validation of the proteomics
findings.
Results:
Our study demonstrated that mice with cleared intestinal flora exhibited decreased sensitivity
to Concanavalin A induced acute hepatitis. 324 Proteins in liver were differently expressed after intestinal
flora clearance for one week while 210 proteins were differently expressed after intestinal flora
clearance for two weeks. Furthermore, five of the identified proteins were validated by western blotting
and further investigated by semi-quantitative RT-PCR.
Conclusion:
Our results showed that intestinal flora clearance in mice could reduce sensitivity to Concanavalin
A induced liver injury and influence the expression of proteins in liver, which provides a
clue for studying the relationship between gut bacteria and Concanavalin A induced hepatitis.
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Affiliation(s)
- Zhenghu Jia
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Hui Liu
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Mei Song
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Chengmao Yang
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Yapu Zhao
- People's Liberation Army No. 254 Hospital, Tianjin, 300142, China
| | - Xiaoli Wu
- School of Life Sciences, Tianjin University, Tianjin Engineering Center of Micro Nano Biomaterials and Detection Treatment Technology, and Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, 300072, China
| | - Zhenzhou Wu
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Liqing Zhao
- State Key Laboratory of Medicinal Chemical Biology (Nankai University), College of Life Sciences, Nankai University, Tianjin, 300071, China
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Zhang W, Li Z, Wang Z, Yue C, Zheng H, Li R, Zhou M, Hu Z, Wei Z, Li Q. Generation of a monoclonal antibody recognizing the heavily glycosylated CD45 protein and its application on identifying circulating tumor cells. PLoS One 2018; 13:e0192506. [PMID: 29425242 PMCID: PMC5806877 DOI: 10.1371/journal.pone.0192506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2017] [Accepted: 01/24/2018] [Indexed: 12/31/2022] Open
Abstract
Here, we provide direct evidence that using recombinant proteins expressed in eukaryotic cells as antigen is a practical way to generate monoclonal antibodies (mAbs) against heavily glycosylated proteins. Heavily glycosylated proteins are typically difficult targets for mAb generation, being limited by unsatisfactory affinity and low specificity. Using the heavily glycosylated CD45 protein as an example, we demonstrate the entire process of expressing the protein in eukaryotic cells and using it as an antigen to generate CD45-targeting mAbs in mice. The mAbs generated showed robust affinity and specificity, which are crucial factors for differentiate circulating tumor cells from white blood cells in human breast cancer patient samples. Only 1 cell fusion and 2 cyclic sub-cloning steps were necessary before mAbs with satisfactory performance were obtained.
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Affiliation(s)
- Weikai Zhang
- Medical College, Henan University of Science and Technology, Luoyang, P. R. China
- Department of Biomedical Engineering, School of Life Science, Beijing Institute of Technology, Beijing, P. R. China
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Zhitao Li
- Medical College, Henan University of Science and Technology, Luoyang, P. R. China
| | - Zihua Wang
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Chunyan Yue
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Hui Zheng
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Ren Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Mingxing Zhou
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Zhiyuan Hu
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing, P. R. China
- Yangtze River Delta Academy of Nanotechnology and Industry Development Research, Jiaxing, Zhejiang Province, P. R. China
| | - Zewen Wei
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology of China, Beijing, P. R. China
| | - Qin Li
- Department of Biomedical Engineering, School of Life Science, Beijing Institute of Technology, Beijing, P. R. China
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Zhang M, Zhang H, Li H, Lai F, Li X, Tang Y, Min T, Wu H. Antioxidant Mechanism of Betaine without Free Radical Scavenging Ability. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2016; 64:7921-7930. [PMID: 27677203 DOI: 10.1021/acs.jafc.6b03592] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Betaine (BET) is a native compound widely studied as an antioxidant in agriculture and human health. However, the antioxidant mechanism of BET remains unclear. In this research, radical scavenging assays showed that BET had little free radical scavenging activity. However, the antioxidant activity of BET was confirmed by cellular antioxidant activity (CAA) and erythrocyte hemolysis assays. The results of quantitative PCR (qPCR) and enzyme activity determination kits showed that the antioxidant activity of BET was not due to the gene expression and activity of antioxidases. High-pressure liquid chromatography (HPLC) assessment of the effect of BET on sulfur-containing amino acid metabolism showed that BET increased the levels of nonenzymatic antioxidants,S-adenosylmethionine (SAM) and methionine (p < 0.05), via the regulation of the methionine-omocysteine cycle. Additionally, the three methyl groups of BET were found to play a key role in its antioxidant activity. The possible reason was that because of the hydrophobicity of the three methyl groups and hydrophilicity of the carboxyl of BET, a tight protective membrane was formed around cells to prevent oxidative stress inducer from inducing ROS generation and cell damage. In conclusion, the antioxidant mechanism of BET was found to enhance nonenzymatic antioxidant defenses via the methionine-homocysteine cycle and form a protective membrane around cells.
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Affiliation(s)
- Mengmeng Zhang
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Hong Zhang
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Huixian Li
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Furao Lai
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Xiaofeng Li
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Yuqian Tang
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Tian Min
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
| | - Hui Wu
- College of Food Science and Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China
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