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Shu J, Ren X, Cheng H, Wang S, Yue L, Li X, Yin M, Chen X, Zhang T, Hui Z, Bao X, Song W, Yu H, Dang L, Zhang C, Wang J, Zhao Q, Li Z. Beneficial or detrimental: Recruiting more types of benign cases for cancer diagnosis based on salivary glycopatterns. Int J Biol Macromol 2023; 252:126354. [PMID: 37591435 DOI: 10.1016/j.ijbiomac.2023.126354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 08/11/2023] [Accepted: 08/14/2023] [Indexed: 08/19/2023]
Abstract
With the advantages of convenient, painless and non-invasive collection, saliva holds great promise as a valuable biomarker source for cancer detection, pathological assessment and therapeutic monitoring. Salivary glycopatterns have shown significant potential for cancer screening in recent years. However, the understanding of benign lesions at non-cancerous sites in cancer diagnosis has been overlooked. Clarifying the influence of benign lesions on salivary glycopatterns and cancer screening is crucial for advancing the development of salivary glycopattern-based diagnostics. In this study, 2885 samples were analyzed using lectin microarrays to identify variations in salivary glycopatterns according to the number, location, and type of lesions. By utilizing our previously published data of tumor-associated salivary glycopatterns, the performance of machine learning algorithm for cancer screening was investigated to evaluate the effect of adding benign disease cases to the control group. The results demonstrated that both the location and number of lesions had discernible effects on salivary glycopatterns. And it was also revealed that incorporating a broad range of benign diseases into the controls improved the classifier's performance in distinguishing cancer cases from controls. This finding holds guiding significance for enhancing salivary glycopattern-based cancer screening and facilitates their practical implementation in clinical settings.
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Affiliation(s)
- Jian Shu
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China; School of Medicine, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Xiameng Ren
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Hongwei Cheng
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Shiyi Wang
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Lixin Yue
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Xia Li
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Mengqi Yin
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Xiangqin Chen
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Tiantian Zhang
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Ziye Hui
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Xiaojuan Bao
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Wanghua Song
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Hanjie Yu
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Liuyi Dang
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Chen Zhang
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China
| | - Jun Wang
- University Hospital, Northwest University, Xi'an, China
| | - Qi Zhao
- University Hospital, Northwest University, Xi'an, China
| | - Zheng Li
- Laboratory for Functional Glycomics, College of Life Sciences, Faculty of Life Science & Medicine, Northwest University, Xi'an, China.
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2
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Li C, Dan W, Li P, Xin M, Lan R, Zhu B, Chen Z, Dong W, Dang L, Zhang X, Sun S. Site-specific N-glycan changes during semen liquefaction. Anal Biochem 2023; 680:115318. [PMID: 37696464 DOI: 10.1016/j.ab.2023.115318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 07/16/2023] [Accepted: 09/07/2023] [Indexed: 09/13/2023]
Abstract
Normal liquefaction of semen is one of the key steps to ensure the smooth progress of fertilization, and glycosylation has been reported to be involved in the whole process of fertilization. Till now, it is still unclear whether and how glycosylation changes during the liquefaction process of semen. In this study, by performing a glycoproteomic analysis of human semen with the liquefaction process (liquefaction time of semen: 0 min vs 30 min) using our recently developed StrucGP software combined with the Tandem Mass Tags (TMT) based quantification, we identified 25 intact glycopeptides (IGPs) from 10 glycoproteins in semen that were significantly changed during liquefaction, including 23 up-regulated and two down-regulated. Among the 23 up-regulated glycopeptides, half were modified with sialylated glycans, suggesting that sialylated glycans may play a key role in the semen liquefaction process. The data provide an invaluable resource for further studies on the role of glycosylation during semen liquefaction.
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Affiliation(s)
- Cheng Li
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Wei Dan
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Pengfei Li
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Miaomiao Xin
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Rongxia Lan
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Bojing Zhu
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Zexuan Chen
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Wenbo Dong
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Liuyi Dang
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China
| | - Xinwen Zhang
- Center of Medical Genetics, Xi'an People's Hospital (Xi'an Fourth Hospital), Xi'an, Shaanxi, 710004, PR China
| | - Shisheng Sun
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, PR China.
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Dang L, Li P, Dan W, Liu H, Shen J, Zhu B, Jia L, Sun S. Glycoproteomic analysis of regulatory effects of bisecting N-glycans on N-glycan biosynthesis and protein expressions in human HK-2 cells. Carbohydr Res 2023; 531:108894. [PMID: 37421876 DOI: 10.1016/j.carres.2023.108894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 06/02/2023] [Accepted: 07/01/2023] [Indexed: 07/10/2023]
Abstract
Bisecting N-glycan is known to be a metastasis suppressor and plays a regulatory role in the biosynthesis of N-glycans. Previous studies have shown that bisecting N-glycans are capable of modulating both the branching and terminal modifications of glycans. However, these effects have been investigated mainly by glycomic approaches and it remains unclear how they alter when glycans are attached to different glycosites of proteins. Here, we systematically investigated the regulatory roles of bisecting N-glycans in human HK-2 cells using StrucGP, a strategy we developed for structural interpretation of site-specific N-glycans on glycoproteins. The glycoproteomics analysis showed that most of bisecting N-glycans are complex type and often occur in company with core fucosylation. With the overexpression and knockdown of MGAT3, the only enzyme responsible for bisecting N-glycan synthesis, we found that bisecting N-glycans can impact the biosynthesis of N-glycans from multiple aspects, including glycan types, branching, sialylation, fucosylation (different effects for core and terminal fucosylation) as well as the presence of terminal N-acetylglucosamine. Furthermore, gene ontology analysis suggested that most proteins with bisecting N-glycans located in the extracellular region or membrane, where they function mostly in cell adhesion, extracellular matrix regulation and cell signaling. Finally, we showed that overexpression of bisecting N-glycans had a broad impact on the protein expressions of HK-2 cells, involving multiple biological processes. Taken together, our work systematically demonstrated the expression profiles of bisecting N-glycans, and their regulatory effects on the biosynthesis of N-glycans and protein expressions, which provide valuable information for the functional elucidation of bisecting N-glycans.
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Affiliation(s)
- Liuyi Dang
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Pengfei Li
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Wei Dan
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Huanhuan Liu
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Jiechen Shen
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Bojing Zhu
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Li Jia
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China
| | - Shisheng Sun
- College of Life Sciences, Northwest University, Xi'an, Shaanxi Province, 710069, China.
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4
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Yu H, Li M, Shu J, Dang L, Wu X, Wang Y, Wang X, Chang X, Bao X, Zhu B, Ren X, Chen W, Li Y. Characterization of aberrant glycosylation associated with osteoarthritis based on integrated glycomics methods. Arthritis Res Ther 2023; 25:102. [PMID: 37308935 PMCID: PMC10258941 DOI: 10.1186/s13075-023-03084-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Accepted: 06/03/2023] [Indexed: 06/14/2023] Open
Abstract
BACKGROUND Osteoarthritis (OA) is the most common form of arthritis, affecting millions of aging people. Investigation of abnormal glycosylation is essential for the understanding of pathological mechanisms of OA. METHODS The total protein was isolated from OA (n = 13) and control (n = 11) cartilages. Subsequently, glycosylation alterations of glycoproteins in OA cartilage were investigated by lectin microarrays and intact glycopeptides analysis. Finally, the expression of glycosyltransferases involved in the synthesis of altered glycosylation was assessed by qPCR and GEO database. RESULTS Our findings revealed that several glycopatterns, such as α-1,3/6 fucosylation and high-mannose type of N-glycans were altered in OA cartilages. Notably, over 27% of identified glycopeptides (109 glycopeptides derived from 47 glycoproteins mainly located in the extracellular region) disappeared or decreased in OA cartilages, which is related to the cartilage matrix degradation. Interestingly, the microheterogeneity of N-glycans on fibronectin and aggrecan core protein was observed in OA cartilage. Our results combined with GEO data indicated that the pro-inflammatory cytokines altered the expression of glycosyltransferases (ALG3, ALG5, MGAT4C, and MGAT5) which may contribute to the alterations in glycosylation. CONCLUSION Our study revealed the abnormal glycopatterns and heterogeneities of site-specific glycosylation associated with OA. To our knowledge, it is the first time that the heterogeneity of site-specific N-glycans was reported in OA cartilage. The results of gene expression analysis suggested that the expression of glycosyltransferases was impacted by pro-inflammatory cytokines, which may facilitate the degradation of protein and accelerate the process of OA. Our findings provide valuable information for the understanding of molecular mechanisms in the pathogenesis of OA.
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Affiliation(s)
- Hanjie Yu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Mingxiu Li
- Department of Foot and Ankle Surgery, Honghui Hospital, Xi'an Jiaotong University, 76 Nanguo Road, Xi'an, 710054, Shaanxi Province, China
| | - Jian Shu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Liuyi Dang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Xin Wu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Yuzi Wang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Xuan Wang
- The Second Clinical Medical College of Shaanxi University of Chinese Medicine, Xianyang, China
| | - Xin Chang
- Department of Foot and Ankle Surgery, Honghui Hospital, Xi'an Jiaotong University, 76 Nanguo Road, Xi'an, 710054, Shaanxi Province, China
| | - Xiaojuan Bao
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Bojing Zhu
- College of Life Science, Northwest University, Xi'an, China
| | - Xiameng Ren
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Wentian Chen
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Yi Li
- Department of Foot and Ankle Surgery, Honghui Hospital, Xi'an Jiaotong University, 76 Nanguo Road, Xi'an, 710054, Shaanxi Province, China.
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5
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Sim BZ, Aaron L, Coulter C, Parkes-Smith J, Badrick T, May K, Armstrong M, Hendry S, Sundac L, Dang L, Ho J, Hanson J, Smith S, Choong K, Henderson AH, Bursle E. A multi-centre retrospective study of Nocardia speciation and antimicrobial susceptibility in Queensland, Australia. Eur J Clin Microbiol Infect Dis 2023; 42:339-345. [PMID: 36720769 DOI: 10.1007/s10096-022-04542-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 12/15/2022] [Indexed: 02/02/2023]
Abstract
The study aims to characterise the species identification and antimicrobial susceptibility testing (AST) results of Nocardial isolates from adult patients across major public hospitals in Queensland, Australia, over a 15-year period. A multi-centre retrospective observational study of Nocardia sp. isolates was conducted from 7 major public hospitals in Queensland, Australia, over a 15-year period. Clinical samples from patients aged ≥ 18 years that isolated Nocardia sp. were included. Demographic and clinical data were collected, along with species identification and AST results. Overall, 484 Nocardia sp. were isolated. Most patients were male (297, 61%) with a mean (IQR) age of 60 (51-75) and a median (IQR) Charlson Comorbidity Index of 4 (2-6). Of these, 239 (49%) patients were immunosuppressed. Organisms were most frequently isolated from sputum (174, 36%), and superficial swabs (102, 21%). Patients presented with pulmonary infections (165, 35%) and superficial skin and soft tissue infections (87, 18%) most commonly. One hundred (21%) isolates were deemed pulmonary colonisation and were not treated. Of the speciated organisms, N. nova complex was the most common (93, 19%), followed by N. farcinica complex (79, 16%). Organisms were reliably susceptible to linezolid (240/245, 98%), amikacin (455/470, 97%), and trimethoprim/sulfamethoxazole (459/476, 96%), but less so to imipenem (243/472, 51%) and ceftriaxone (261/448, 58%). This is the largest Australian description of Nocardia sp. to date. Given antimicrobials are often commenced prior to AST results and sometimes even speciation, characterisation of local species and antibiogram data is important to guide empiric choices and local guidelines.
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Affiliation(s)
- B Z Sim
- Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, QLD, 4102, Australia. .,Cairns Hospital, 165 The Esplanade, Cairns, QLD, 4870, Australia. .,University of Queensland, St. Lucia, QLD, 4072, Australia.
| | - L Aaron
- Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, QLD, 4102, Australia
| | - C Coulter
- Queensland Mycobacterium Reference Laboratory, Herston Road, Herston, QLD, 4029, Australia
| | - J Parkes-Smith
- The Prince Charles Hospital, 627 Rode Road, Chermside, QLD, 4032, Australia
| | - T Badrick
- Gold Coast University Hospital, 1 Hospital Boulevard, Southport, QLD, 4215, Australia
| | - K May
- Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, QLD, 4102, Australia
| | - M Armstrong
- Townsville University Hospital, 100 Angus Smith Drive, Douglas, QLD, 4814, Australia
| | - S Hendry
- Townsville University Hospital, 100 Angus Smith Drive, Douglas, QLD, 4814, Australia
| | - L Sundac
- Royal Brisbane and Women's Hospital, Butterfield Street, Herston, QLD, 4029, Australia
| | - L Dang
- Royal Brisbane and Women's Hospital, Butterfield Street, Herston, QLD, 4029, Australia
| | - J Ho
- Cairns Hospital, 165 The Esplanade, Cairns, QLD, 4870, Australia
| | - J Hanson
- Cairns Hospital, 165 The Esplanade, Cairns, QLD, 4870, Australia.,Kirby Institute, High Street, Kensington, NSW, 2052, Australia
| | - S Smith
- Cairns Hospital, 165 The Esplanade, Cairns, QLD, 4870, Australia
| | - K Choong
- Sunshine Coast University Hospital, 6 Doherty Street, Birtinya, QLD, 4575, Australia
| | - A H Henderson
- Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, QLD, 4102, Australia
| | - E Bursle
- Princess Alexandra Hospital, 199 Ipswich Road, Woolloongabba, QLD, 4102, Australia.,University of Queensland, St. Lucia, QLD, 4072, Australia
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6
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Dan W, Li C, Li J, Li P, Xin M, Chen Z, Dang L, Yu Z, Li J, Shen J, Hu L, Sun S. Glycoproteomic analysis reveals the effects of bisecting GlcNAc in intrahepatic cholangiocarcinoma. Glycoconj J 2022; 39:737-745. [PMID: 36322335 DOI: 10.1007/s10719-022-10085-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 09/26/2022] [Accepted: 10/06/2022] [Indexed: 11/05/2022]
Abstract
Intrahepatic cholangiocarcinoma (ICC) is the second major subtype of primary liver cancer and has caused more and more attention with increasing incidence and mortality worldwide. Our previous study found that bisecting N-glycans are commonly increased in ICC, while the effects and potential functions of bisecting GlcNAc in ICC are still largely unclear. In this study, we further confirmed that the structures of bisecting GlcNAc were significantly up-regulated in ICC compared with paracancer tissues by glycoproteomic data and lectin histochemistry. The expression of its glycosyltransferase MGAT3 was also up-regulated in ICC tissues at both mRNA and protein levels, and expression of MGAT3 is negatively correlated with overall survival explored by bioinformatic analyses and published datasets from 255 patients. Next, the silencing of MGAT3 could inhibit the growth and invasion of ICC cells, and overexpressing of MGAT3 only promoted ICC cell invasion. Further glycoproteomic analysis showed that the commonly glycoproteins modified by bisecting GlcNAc after MGAT3-overexpression in two ICC cell lines were mainly involved in cell movement-related biological processes, such as cell adhesion, integrin-related and ECM-receptor interaction. This study sheds light on the potential effects of bisecting GlcNAc in ICC cells and suggests that MGAT3 might be used as a potential target in the therapy of ICC.
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Affiliation(s)
- Wei Dan
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Cheng Li
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Jun Li
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Pengfei Li
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Miaomiao Xin
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Zexuan Chen
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Liuyi Dang
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Zihao Yu
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Jing Li
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Jiechen Shen
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China
| | - Liangshuo Hu
- Department of Hepatobiliary Surgery, Institute of Advanced Surgical Technology and Engineering, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Shisheng Sun
- College of Life Sciences, Northwest University, 710069, Xi'an, Shaanxi Province, P. R. China.
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7
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Xin M, You S, Wu J, Xu Y, Li C, Zhu B, Shen J, Chen Z, Dang L, Dan W, Zhang X, Sun S. Evaluation of absorbent cotton for glycopeptide enrichment. Anal Bioanal Chem 2022; 414:8245-8253. [PMID: 36181511 DOI: 10.1007/s00216-022-04353-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 09/19/2022] [Accepted: 09/22/2022] [Indexed: 11/30/2022]
Abstract
Selecting proper and efficient glycopeptide enrichment approaches are essential for mass spectrometry-based glycoproteomics since glycopeptides are usually with microheterogeneity and low abundance in most biological samples. Herein, we introduced a cotton hydrophilic interaction liquid chromatography (HILIC) approach for large-scale glycopeptide enrichment with 80% acetonitrile/1% trifluoroacetic acid as the optimal sample loading buffer. The comparison of cotton HILIC with Venusil HILIC and mixed anion-exchange (MAX) approaches indicated that cotton HILIC was superior in overall glycopeptide enrichment, whereas Venusil HILIC preferred in complex glycan structures and MAX performed better with high mannose glycans. Exploration of capacity and recovery rate of cotton HILIC illustrated that 5mg cotton packed in a 200μL tip achieved a reasonable glycopeptide enrichment performance (~6% recovery) from ~0.5mg peptides. In conclusion, cotton HILIC can be used as an optional glycopeptide enrichment approach in glycosylation analysis with its specific merit.
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Affiliation(s)
- Miaomiao Xin
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China.,South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice, 38925, Vodnany, Czech Republic
| | - Shanshan You
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Jingyu Wu
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Yintai Xu
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Cheng Li
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Bojing Zhu
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Jiechen Shen
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Zexuan Chen
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Liuyi Dang
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Wei Dan
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China
| | - Xinwen Zhang
- Department of Medical Genetics, Xi'an Fourth Hospital, Xi'an, Shaanxi Province, 710004, People's Republic of China
| | - Shisheng Sun
- College of Life Science, Northwest University, Xi'an, Shaanxi Province, 710069, People's Republic of China.
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8
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Wang X, Yue L, Dang L, Yang J, Chen Z, Wang X, Shu J, Li Z. Correction to: Role of sialylated glycans on bovine lactoferrin against influenza virus. Glycoconj J 2022; 39:545-546. [PMID: 35687198 DOI: 10.1007/s10719-022-10071-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Xilong Wang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Lixin Yue
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Liuyi Dang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Jiajun Yang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Zhuo Chen
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Xiurong Wang
- National Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Science, Harbin, China
| | - Jian Shu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Zheng Li
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China.
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9
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Li P, Ma C, Li J, You S, Dang L, Wu J, Hao Z, Li J, Zhi Y, Chen L, Sun S. Proteomic characterization of four subtypes of M2 macrophages derived from human THP-1 cells. J Zhejiang Univ Sci B 2022; 23:407-422. [PMID: 35557041 DOI: 10.1631/jzus.b2100930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Macrophages are widely distributed immune cells that contribute to tissue homeostasis. Human THP-1 cells have been widely used in various macrophage-associated studies, especially those involving pro-inflammatory M1 and anti-inflammatory M2 phenotypes. However, the molecular characterization of four M2 subtypes (M2a, M2b, M2c, and M2d) derived from THP-1 has not been fully investigated. In this study, we systematically analyzed the protein expression profiles of human THP-1-derived macrophages (M0, M1, M2a, M2b, M2c, and M2d) using quantitative proteomics approaches. The commonly and specially regulated proteins of the four M2 subtypes and their potential biological functions were further investigated. The results showed that M2a and M2b, and M2c and M2d have very similar protein expression profiles. These data could serve as an important resource for studies of macrophages using THP-1 cells, and provide a reference to distinguish different M2 subtypes in macrophage-associated diseases for subsequent clinical research.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Shisheng Sun
- College of Life Science, Northwest University, Xi'an 710069, China.
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10
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Shu J, Yu H, Ren X, Wang Y, Zhang K, Tang Z, Dang L, Chen W, Li B, Xie H, Li Z. Role of salivary glycopatterns for oral microbiota associated with gastric cancer. Int J Biol Macromol 2022; 209:1368-1378. [PMID: 35461868 DOI: 10.1016/j.ijbiomac.2022.04.133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 04/01/2022] [Accepted: 04/18/2022] [Indexed: 11/25/2022]
Abstract
Microbiota in the oral cavity plays an important role in maintaining human health. Our previous studies have revealed significant alterations of salivary glycopatterns in gastric cancer (GC) patients, but it is unclear whether these altered salivary glycopatterns can cause the dysbiosis of oral microbiota. In this study, the oral microbiome of healthy volunteers (HVs) and GC patients were detected. The neoglycoproteins were then synthesized according to the altered glycopatterns in GC patients and used to explore the effects of specific salivary glycopattern against oral microbiota. The results showed that five species were significantly increased (p < 0.05) while two species were significantly decreased (p < 0.01) in the saliva of GC patients compared with that of HVs. And the fucose-neoglycoproteins (30-100 μg/mL) could reduce the adhesion and toxicity of Aggregatibacter segnis (A. segnis) to oral cells (HOEC and CAL-27), change the glycan structures of lipopolysaccharide on the surface of A. segnis, and enhance the capacity of A. segnis to trigger innate immune responses. This study revealed that the changes of salivary protein glycopatterns in GC patients might contribute to the dysbiosis of oral microbiota, and had important implications in developing new carbohydrate drugs to maintain a balanced microbiota in the oral.
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Affiliation(s)
- Jian Shu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Hanjie Yu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Xiameng Ren
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Yan Wang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Kun Zhang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Zhen Tang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Liuyi Dang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Wentian Chen
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
| | - Baozhen Li
- The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an Jiaotong University Health Science Center, 277 Yanta Xilu, Xi'an 710061, China
| | - Hailong Xie
- Institute of Cancer Research, University of South China, Hengyang, China
| | - Zheng Li
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China.
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11
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Li J, Zhao T, Li J, Shen J, Jia L, Zhu B, Dang L, Ma C, Liu D, Mu F, Hu L, Sun S. Precision N-glycoproteomics reveals elevated LacdiNAc as a novel signature of intrahepatic cholangiocarcinoma. Mol Oncol 2021; 16:2135-2152. [PMID: 34855283 PMCID: PMC9168967 DOI: 10.1002/1878-0261.13147] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 11/02/2021] [Accepted: 11/30/2021] [Indexed: 12/09/2022] Open
Abstract
Primary liver cancer, mainly comprising hepatocellular carcinoma (HCC) and intrahepatic cholangiocarcinoma (ICC), remains a major global health problem. Although ICC is clinically different from HCC, their molecular differences are still largely unclear. In this study, precision N‐glycoproteomic analysis was performed on both ICC and HCC tumors as well as paracancer tissues to investigate their aberrant site‐specific N‐glycosylation. By using our newly developed glycoproteomic methods and novel algorithm, termed ‘StrucGP’, a total of 486 N‐glycan structures attached on 1235 glycosites were identified from 894 glycoproteins in ICC and HCC tumors. Notably, glycans with uncommon LacdiNAc (GalNAcβ1‐4GlcNAc) structures were distinguished from their isomeric glycans. In addition to several bi‐antennary and/or bisecting glycans that were commonly elevated in ICC and HCC, a number of LacdiNAc‐containing, tri‐antennary, and core‐fucosylated glycans were uniquely increased in ICC. More interestingly, almost all LacdiNAc‐containing N‐glycopeptides were enhanced in ICC tumor but not in HCC tumor, and this phenomenon was further confirmed by lectin histochemistry and the high expression of β1‐4 GalNAc transferases in ICC at both mRNA and protein expression levels. The novel N‐glycan alterations uniquely detected in ICC provide a valuable resource for future studies regarding to the discovery of ICC diagnostic biomarkers, therapeutic targets, and mechanism investigations.
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Affiliation(s)
- Jun Li
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Ting Zhao
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Jing Li
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Jiechen Shen
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Li Jia
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Bojing Zhu
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Liuyi Dang
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Chen Ma
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Didi Liu
- College of Life ScienceNorthwest UniversityXi'anChina
| | - Fan Mu
- Department of Hepatobiliary SurgeryInstitute of Advanced Surgical Technology and EngineeringThe First Affiliated Hospital of Xi'an Jiaotong UniversityChina
| | - Liangshuo Hu
- Department of Hepatobiliary SurgeryInstitute of Advanced Surgical Technology and EngineeringThe First Affiliated Hospital of Xi'an Jiaotong UniversityChina
| | - Shisheng Sun
- College of Life ScienceNorthwest UniversityXi'anChina
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12
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Sun J, Liu H, Dang L, Liu J, Wang J, Lu Z, Lu Y. Genome shuffling of Lactobacillus plantarum 163 enhanced antibacterial activity and usefulness in preserving orange juice. Lett Appl Microbiol 2021; 73:741-749. [PMID: 34562034 DOI: 10.1111/lam.13566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 08/25/2021] [Accepted: 09/17/2021] [Indexed: 01/04/2023]
Abstract
Lactic acid bacteria have been used to inhibit the growth of spoilage bacteria in food and animal feeds. For instance, Lactobacillus plantarum 163 can inhibit efficiently the growth of both gram-positive and gram-negative bacteria. In our study, the antibacterial activity of L. plantarum 163 was further improved significantly by genome shuffling. The optimal conditions for protoplast formation and regeneration were 20 mg ml-1 lysozyme and 5 mg ml-1 mutanolysin for 30 min at 37°C using 0·5 mol l-1 sucrose as stabilizer. The protoplasts were inactivated under ultraviolet light for 120 s or heated at 58°C for 20 min. After two rounds of genome shuffling, the inhibitory activity of strain F2-14 was improved by 2·45- and 1·99-fold, respectively, as compared to their parent strains. The prepared antibacterial peptides supernatant (APS) was added to the orange juice to inhibit spores of Alicyclobacillus acidoterrestris (SAA) at 45 and 28°C. Results showed that the growth of A. acidoterrestris was significantly inhibited, and the decrease in total soluble solids, OD value and pH value was also delayed. After treatment with APS, the thermal sensitivity of spores was increased and its D value was reduced to 13·78, 3·87 and 1·47 min at 80, 90 and 95°C respectively.
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Affiliation(s)
- J Sun
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, China
| | - H Liu
- College of Horticulture, Nanjing Agricultural University, Nanjing, China
| | - L Dang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - J Liu
- China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology & Business University (BTBU), Beijing, China
| | - J Wang
- China-Canada Joint Lab of Food Nutrition and Health (Beijing), Beijing Technology & Business University (BTBU), Beijing, China
| | - Z Lu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing, China
| | - Y Lu
- College of Food Science and Engineering, Nanjing University of Finance and Economics, Nanjing, China
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13
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Jia L, Li J, Li P, Liu D, Li J, Shen J, Zhu B, Ma C, Zhao T, Lan R, Dang L, Li W, Sun S. Site-specific glycoproteomic analysis revealing increased core-fucosylation on FOLR1 enhances folate uptake capacity of HCC cells to promote EMT. Am J Cancer Res 2021; 11:6905-6921. [PMID: 34093861 PMCID: PMC8171077 DOI: 10.7150/thno.56882] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 04/14/2021] [Indexed: 12/24/2022] Open
Abstract
Rationale: Epithelial-mesenchymal transition (EMT) has been recognized as an important step toward high invasion and metastasis of many cancers including hepatocellular carcinoma (HCC), while the mechanism for EMT promotion is still ambiguous. Methods: The dynamic alterations of site-specific glycosylation during HGF/TGF-β1-induced EMT process of three HCC cell lines were systematically investigated using precision glycoproteomic methods. The possible roles of EMT-related glycoproteins and site-specific glycans were further confirmed by various molecular biological approaches. Results: Using mass spectrometry-based glycoproteomic methods, we totally identified 2306 unique intact glycopeptides from SMMC-7721 and HepG2 cell lines, and found that core-fucosylated glycans were accounted for the largest proportion of complex N-glycans. Through quantification analysis of intact glycopeptides, we found that the majority of core-fucosylated intact glycopeptides from folate receptor α (FOLR1) were up-regulated in the three HGF-treated cell lines. Similarly, core-fucosylation of FOLR1 were up-regulated in SMMC-7721 and Hep3B cells with TGF-β1 treatment. Using molecular approaches, we further demonstrated that FUT8 was a driver for HGF/TGF-β1-induced EMT. The silencing of FUT8 reduced core-fucosylation and partially blocked the progress of HGF-induced EMT. Finally, we confirmed that the level of core-fucosylation on FOLR1 especially at the glycosite Asn-201 positively regulated the cellular uptake capacity of folates, and enhanced uptake of folates could promote the EMT of HCC cells. Conclusions: Based on the results, we proposed a potential pathway for HGF or TGF-β1-induced EMT of HCC cells: HGF or TGF-β1 treatment of HCC cells can increase the expression of glycosyltransferase FUT8 to up-regulate the core-fucosylation of N-glycans on glycoproteins including the FOLR1; core-fucosylation on FOLR1 can then enhance the folate uptake capacity to finally promote the EMT progress of HCC cells.
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14
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Tu JH, Xu Y, Dai Y, Dang L. Effect of alprostadil on myocardial fibrosis in rats with diabetes mellitus via TGF-β1/Smad signaling pathway. Eur Rev Med Pharmacol Sci 2020; 23:9633-9641. [PMID: 31773714 DOI: 10.26355/eurrev_201911_19457] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To observe the influence of alprostadil on myocardial fibrosis in rats with diabetes mellitus (DM) through the transforming growth factor beta-1 (TGF-β1)/Smad signaling pathway. MATERIALS AND METHODS Wistar rats were employed to induce models of DM (DM group), and alprostadil treatment group (ALPR group) and control group (NC group) were set up. After successful modeling, blood and myocardial tissues were collected from rats. Next, blood glucose level, liver function, and myocardial function were detected. In addition, hematoxylin-eosin (HE) assay was performed to determine pathological changes. The enzyme-linked immunosorbent assay (ELISA) was carried out to measure serum interleukin-6 (IL-6) and cardiac function indexes such as ejection fraction (EF), Reverse Transcription-Polymerase Chain Reaction (RT-PCR) and Western blotting, which were applied to measure the gene and protein expression levels of important molecules in the proliferation and differentiation of myocardial fibroblasts [including checkpoint kinase 1 (Chek1) and alpha-smooth muscle actin (α-SMA)] and the relevant pathway TGF-β1/Smad2. RESULTS The blood glucose level was increased in DM group (p<0.01), suggesting that modeling is successful. The tumor necrosis factor-alpha (TNF-α), IL⁃6, and IL-1 levels were higher in DM group than in NC group. DM group had significantly elevated serum content of alkaline phosphatase (ALP), alanine aminotransferase (ALT), and creatine kinase (CK), as well as left ventricular end-diastolic dimension (LVEDd) and left ventricular end-systolic dimension (LVESd), but it clearly decreased fractional shortening (FS) and EF in comparison with NC group. Besides, myocardial cells were orderly arranged in NC group, while myocardial fibrosis was observed in DM group. The results of RT-PCR showed that the levels of Collagen, Chek1, α-SMA, TGF-β1, and Smad2 in myocardial fibroblasts were notably lowered in ALPR group, but evidently increased in DM group (p<0.05). According to Western blotting, there were evident decreases in the levels of TGF-β1 and Smad2 in myocardial fibroblasts in ALPR group (p<0.05). The above results suggest that alprostadil represses the expression of the TGF-β1/Smad2 signaling pathway and its relevant molecules, thus further suppressing the fibrosis of myocardial cells. CONCLUSIONS Alprostadil treats myocardial fibrosis in DM rats by inhibiting the TGF-β1/Smad2 signaling pathway.
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Affiliation(s)
- J-H Tu
- Department of Cardiology, The Third Affiliated Hospital of Nanchang University, Nanchang, China.
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15
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Lan R, Xin M, Hao Z, You S, Xu Y, Wu J, Dang L, Zhang X, Sun S. Biological Functions and Large-Scale Profiling of Protein Glycosylation in Human Semen. J Proteome Res 2020; 19:3877-3889. [DOI: 10.1021/acs.jproteome.9b00795] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Rongxia Lan
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Miaomiao Xin
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
- Faculty of Fisheries and Protection of Waters, University of South Bohemia in Ceske Budejovice, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Research Institute of Fish Culture and Hydrobiology, Vodnany 38925, Czech Republic
| | - Zhifang Hao
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Shanshan You
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Yintai Xu
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Jingyu Wu
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Liuyi Dang
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
| | - Xinwen Zhang
- The Medical Genetics Centre, Xi 'an People's Hospital (Xi 'an Fourth Hospital), Xi’an Obstetrics and Gynecology Hospital, Xi’an, Shaanxi Province 710004, P. R. China
| | - Shisheng Sun
- College of Life Science, Northwest University, Xi’an, Shaanxi Province 710069, P. R. China
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16
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Wu J, Hao Z, Ma C, Li P, Dang L, Sun S. Comparative proteogenomics profiling of non-small and small lung carcinoma cell lines using mass spectrometry. PeerJ 2020; 8:e8779. [PMID: 32351780 PMCID: PMC7183755 DOI: 10.7717/peerj.8779] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 02/21/2020] [Indexed: 12/15/2022] Open
Abstract
Background Evidences indicated that non-small-cell lung cancer (NSCLC) and small-cell lung cancer (SCLC) might originate from the same cell type, which however ended up to be two different subtypes of lung carcinoma, requiring different therapeutic regimens. We aimed to identify the differences between these two subtypes of lung cancer by using integrated proteome and genome approaches. Methods and Materials Two representative cell lines for each lung cancer subtype were comparatively analysed by quantitative proteomics, and their corresponding transcriptomics data were obtained from the Gene Expression Omnibus database. The integrated analyses of proteogenomic data were performed to determine key differentially expressed proteins that were positively correlated between proteomic and transcriptomic data. Result The proteomics analysis revealed 147 differentially expressed proteins between SCLC and NSCLC from a total of 3,970 identified proteins. Combined with available transcriptomics data, we further confirmed 14 differentially expressed proteins including six known and eight new lung cancer related proteins that were positively correlated with their transcriptomics data. These proteins are mainly involved in cell migration, proliferation, and invasion. Conclusion The proteogenomic data on both NSCLC and SCLC cell lines presented in this manuscript is complementary to existing genomic and proteomic data related to lung cancers and will be crucial for a systems biology-level understanding of the molecular mechanism of lung cancers. The raw mass spectrometry data have been deposited to the ProteomeXchange Consortium via the PRIDE partner repository with the dataset identifier PXD015270.
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Affiliation(s)
- Jingyu Wu
- College of Life Science, Northwest University, Xi'an, China
| | - Zhifang Hao
- College of Life Science, Northwest University, Xi'an, China
| | - Chen Ma
- College of Life Science, Northwest University, Xi'an, China
| | - Pengfei Li
- College of Life Science, Northwest University, Xi'an, China
| | - Liuyi Dang
- College of Life Science, Northwest University, Xi'an, China
| | - Shisheng Sun
- College of Life Science, Northwest University, Xi'an, China
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17
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Zhao T, Jia L, Li J, Ma C, Wu J, Shen J, Dang L, Zhu B, Li P, Zhi Y, Lan R, Xu Y, Hao Z, Chai Y, Li Q, Hu L, Sun S. Heterogeneities of Site-Specific N-Glycosylation in HCC Tumors With Low and High AFP Concentrations. Front Oncol 2020; 10:496. [PMID: 32426269 PMCID: PMC7212448 DOI: 10.3389/fonc.2020.00496] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Accepted: 03/19/2020] [Indexed: 12/12/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is still one of the malignant tumors with high morbidity and mortality in China and worldwide. Although alpha-fetoprotein (AFP) as well as core fucosylated AFP-L3 have been widely used as important biomarkers for HCC diagnosis and evaluation, the AFP level shows a huge variation among HCC patient populations. In addition, the AFP level has also been proved to be associated with pathological grade, progression, and survival of HCC patients. Understanding the intrinsic heterogeneities of HCC associated with AFP levels is essential for the molecular mechanism studies of HCC with different AFP levels as well as for the potential early diagnosis and personalized treatment of HCC with AFP negative. In this study, an integrated N-glycoproteomic and proteomic analysis of low and high AFP levels of HCC tumors was performed to investigate the intrinsic heterogeneities of site-specific glycosylation associated with different AFP levels of HCC. By large-scale profiling and quantifying more than 4,700 intact N-glycopeptides from 20 HCC and 20 paired paracancer samples, we identified many commonly altered site-specific N-glycans from HCC tumors regardless of AFP levels, including decreased modifications by oligo-mannose and sialylated bi-antennary glycans, and increased modifications by bisecting glycans. By relative quantifying the intact N-glycopeptides between low and high AFP tumor groups, the great heterogeneities of site-specific N-glycans between two groups of HCC tumors were also uncovered. We found that several sialylated but not core fucosylated tri-antennary glycans were uniquely increased in low AFP level of HCC tumors, while many core fucosylated bi-antennary or hybrid glycans as well as bisecting glycans were uniquely increased in high AFP tumors. The data provide a valuable resource for future HCC studies regarding the mechanism, heterogeneities and new biomarker discovery.
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Affiliation(s)
- Ting Zhao
- College of Life Science, Northwest University, Xi'an, China
| | - Li Jia
- College of Life Science, Northwest University, Xi'an, China
| | - Jun Li
- College of Life Science, Northwest University, Xi'an, China
| | - Chen Ma
- College of Life Science, Northwest University, Xi'an, China
| | - Jingyu Wu
- College of Life Science, Northwest University, Xi'an, China
| | - Jiechen Shen
- College of Life Science, Northwest University, Xi'an, China
| | - Liuyi Dang
- College of Life Science, Northwest University, Xi'an, China
| | - Bojing Zhu
- College of Life Science, Northwest University, Xi'an, China
| | - Pengfei Li
- College of Life Science, Northwest University, Xi'an, China
| | - Yuan Zhi
- College of Life Science, Northwest University, Xi'an, China
| | - Rongxia Lan
- College of Life Science, Northwest University, Xi'an, China
| | - Yintai Xu
- College of Life Science, Northwest University, Xi'an, China
| | - Zhifang Hao
- College of Life Science, Northwest University, Xi'an, China
| | - Yichao Chai
- Department of Hepatobiliary Surgery, Institute of Advanced Surgical Technology and Engineering, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Qingshan Li
- Department of Hepatobiliary Surgery, Institute of Advanced Surgical Technology and Engineering, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Liangshuo Hu
- Department of Hepatobiliary Surgery, Institute of Advanced Surgical Technology and Engineering, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Shisheng Sun
- College of Life Science, Northwest University, Xi'an, China
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18
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Dang L, Jia L, Zhi Y, Li P, Zhao T, Zhu B, Lan R, Hu Y, Zhang H, Sun S. Mapping human N-linked glycoproteins and glycosylation sites using mass spectrometry. Trends Analyt Chem 2019; 114:143-150. [PMID: 31831916 PMCID: PMC6907083 DOI: 10.1016/j.trac.2019.02.009] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
N-linked glycoprotein is a highly interesting class of proteins for clinical and biological research. Over the last decade, large-scale profiling of N-linked glycoproteins and glycosylation sites from biological and clinical samples has been achieved through mass spectrometry-based glycoproteomic approaches. In this paper, we reviewed the human glycoproteomic profiles that have been reported in more than 80 individual studies, and mainly focused on the N-glycoproteins and glycosylation sites identified through their deglycosylated forms of glycosite-containing peptides. According to our analyses, more than 30,000 glycosite-containing peptides and 7,000 human glycoproteins have been identified from five different body fluids, twelve human tissues (or related cell lines), and four special cell types. As the glycoproteomic data is still missing for many organs and tissues, a systematical glycoproteomic analysis of various human tissues and body fluids using a uniform platform is still needed for an integrated map of human N-glycoproteomes.
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Affiliation(s)
- Liuyi Dang
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Li Jia
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Yuan Zhi
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Pengfei Li
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Ting Zhao
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Bojing Zhu
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Rongxia Lan
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
| | - Yingwei Hu
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland 21287, USA
| | - Hui Zhang
- Department of Pathology, Johns Hopkins University, Baltimore, Maryland 21287, USA
| | - Shisheng Sun
- College of Life Sciences, Northwest University, Xi’an, Shaanxi province 710069, China
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19
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Dang L, Shen J, Zhao T, Zhao F, Jia L, Zhu B, Ma C, Chen D, Zhao Y, Sun S. Recognition of Bisecting N-Glycans on Intact Glycopeptides by Two Characteristic Ions in Tandem Mass Spectra. Anal Chem 2019; 91:5478-5482. [PMID: 30973713 DOI: 10.1021/acs.analchem.8b05639] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Bisecting N-glycan represents one of the most important modifications to the N-glycan core, and it is involved in various biological processes. Despite many studies on the biological roles of bisecting N-glycans, current approaches for bisecting N-glycan analysis mainly rely on the use of the lectin PHA-E, which are of low specificity and sensitivity. Here, we describe a straightforward method for the recognition of bisecting N-glycans on intact glycopeptides using two characteristic Y ions [peptide+HexNAc3Hex1] and [peptide+HexNAc3Hex1Fuc1] in low energy fragmented MS/MS spectra under higher energy collisional dissociation (HCD) mode. The critical aspect of the method is the combination use of low energy HCD fragmentation and intact glycopeptide analysis. With samples from rat renal tissues, we determined the optimal fragmentation energies and analyzed the influence of core fucosylation on the intensity of the [peptide+HexNAc3Hex1] ion. Using the method, we identified 183 intact glycopeptides with bisecting N-glycans and investigated the primary bisecting N-glycan structures and the possible biological roles of these identified proteins.
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Affiliation(s)
- Liuyi Dang
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Jiechen Shen
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Ting Zhao
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Fei Zhao
- College of Basic Medical Sciences , Shaanxi University of Chinese Medicine , Xianyang 712046 , China
| | - Li Jia
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Bojing Zhu
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Chen Ma
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Danqian Chen
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Yingyong Zhao
- College of Life Sciences , Northwest University , Xi'an 710069 , China
| | - Shisheng Sun
- College of Life Sciences , Northwest University , Xi'an 710069 , China
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20
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Shu J, Dang L, Zhang D, Shah P, Chen L, Zhang H, Sun S. Dynamic analysis of proteomic alterations in response to N-linked glycosylation inhibition in a drug-resistant ovarian carcinoma cell line. FEBS J 2019; 286:1594-1605. [PMID: 30884134 DOI: 10.1111/febs.14811] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 01/04/2019] [Accepted: 11/03/2019] [Indexed: 12/20/2022]
Abstract
Glycosylation inhibition can improve the efficacy of antitumor drugs and enhance the apoptosis of cancer cells, thus holding great potential for cancer treatment. Inhibition of N-glycosylation induces endoplasmic reticulum (ER) stress and the unfolded protein response (UPR), and eventually triggers ER stress-related apoptosis. Unfortunately, the detailed timeline of these cell responses and protein expression alterations related to N-glycosylation inhibition is not explicit yet, and the pathways involved in different stages of N-glycosylation inhibition still need to be characterized. In this study, the dynamic proteome alterations related to N-glycosylation inhibition were investigated by further analyzing our previously published quantitative proteomics data from tunicamycin (TM)-treated ovarian carcinoma (OVCAR-3) cells. The results revealed that N-glycosylation inhibition not only directly affects the expression of glycosylated proteins but also alters an extended scale of proteins. Functional annotation of these altered proteins demonstrated that proteins related to ER stress start changing within 6 h, followed by UPR within 24 h, and eventually ER stress-related apoptosis is triggered after 48 h, indicating the conversion of cellular response from positive to negative. The dynamic proteome data presented here provide important information for better understanding of the significance of N-glycosylation to cell survival and TM-related cancer treatment.
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Affiliation(s)
- Jian Shu
- College of Life Sciences, Northwest University, Xi'an, China
| | - Liuyi Dang
- College of Life Sciences, Northwest University, Xi'an, China
| | - Dandan Zhang
- College of Life Sciences, Northwest University, Xi'an, China
| | - Punit Shah
- Department of Pathology, Johns Hopkins University, Baltimore, MD, USA
| | - Lijun Chen
- Department of Pathology, Johns Hopkins University, Baltimore, MD, USA
| | - Hui Zhang
- Department of Pathology, Johns Hopkins University, Baltimore, MD, USA
| | - Shisheng Sun
- College of Life Sciences, Northwest University, Xi'an, China
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Zhao YQ, Dai Y, Dang L, Kong LH, Zhang Y, Feng RM, Qiao YL, Lang JH. [Real-world research on cervical cancer screening program and effect evaluation for Chinese population]. Zhonghua Zhong Liu Za Zhi 2019; 40:764-771. [PMID: 30392341 DOI: 10.3760/cma.j.issn.0253-3766.2018.10.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To evaluate the actual efficacy of cervical cancer and precancerous lesions screening approaches in real-world regions with different economic levels in China. Methods: The demonstrative application and effect evaluation of cervical cancer screening program were conducted in 21 hospitals nationwide from 2015 to 2018. Multi-stage sampling method was adopted to divide the country into 7 large areas according to geographical location. Two to four screening sites of two types of cancer (cervical cancer and breast cancer) were selected in each area, and the grassroots screening sites were implemented under the guidance of superior hospitals. In rural areas, women were initially screened using cytology, human papillomavirus (HPV) testing and visual inspection. The women with positive cytology or visual inspection were referred for colposcopy, and the women with positive HPV infection were randomly referred for reflex cytology or visual inspection, or direct colposcopy examination. In urban areas, women were primarily randomized into cytology or HPV testing groups. The women with abnormal cytology or positive HPV 16/18 infection were directly referred for colposcopy examination, whereas the women with positive infection of the other 12 high-risk subtypes of HPV were referred for reflex cytology or colposcopy. All of recruited women would be follow-up and screened by the baseline screening techniques in the third year while the positive women underwent colposcopy examination. The positive rates, referral rates, the detection rates of grade 2 and above of cervical intraepithelial neoplasia (CIN 2+ ) were compared. Results: A total of 63 931 women were recruited at the baseline. Among them, 11 rural sites included 33 823 women: 15 577, 11 157 and 7 089 women were screened by HPV testing, visual inspection via acetic acid or Lugol's iodine (VIA/VILI) and cytology, respectively. Additionally, 30 108 women were from 10 urban sites: 9 907 and 20 201 women were screened by cytology and HPV subtyping, respectively. The HPV positive rate for urban women was 9.34%, whereas that for rural women was 12.53%. The abnormal rate of cytology for urban women was 5.63%, and that for rural women was 4.24%. The positive rate of VIA/VILI in the rural women was 12.25% Furthermore, the detection rate of CIN2+ at the baseline was 0.56%, and that was statistically higher in HPV-positive group than cytology-positive group (P<0.05). Conclusions: All of screening sites completed the baseline screening tasks as expected. The prevalence of HPV infection is higher in rural women than urban women. The performance of HPV testing is better than cytology for detecting CIN2+ cases. This real-world demonstration study provides evidences for cervical cancer prevention and control in different regions.
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Affiliation(s)
- Y Q Zhao
- Office of Cancer Prevention and Treatment, Sichuan Cancer Hospital and Institute, Sichuan Cancer Center, School of Medicine, University of Electronic Science and Technology of China, Chengdu 610041, China
| | - Y Dai
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - L Dang
- Department of Cancer Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - L H Kong
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - Y Zhang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China
| | - R M Feng
- Department of Cancer Prevention Research, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - Y L Qiao
- Department of Cancer Epidemiology, National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China
| | - J H Lang
- Department of Obstetrics and Gynecology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences, Beijing 100730, China
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22
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Zhu B, Shen J, Zhao T, Jiang H, Ma T, Zhang J, Dang L, Gao N, Hu Y, Shi Y, Sun S. Intact Glycopeptide Analysis of Influenza A/H1N1/09 Neuraminidase Revealing the Effects of Host and Glycosite Location on Site‐Specific Glycan Structures. Proteomics 2019; 19:e1800202. [DOI: 10.1002/pmic.201800202] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 11/23/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Bojing Zhu
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Jiechen Shen
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Ting Zhao
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Haihai Jiang
- CAS Key Laboratory of Pathogenic Microbiology and ImmunologyInstitute of MicrobiologyChinese Academy of Sciences 100101 Beijing P. R. China
| | - Tianran Ma
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Jie Zhang
- Department of Computer Science and TechnologyXidian University Xi'an Shaanxi province 710069 P. R. China
| | - Liuyi Dang
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Ni Gao
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
| | - Yingwei Hu
- Department of PathologyJohns Hopkins University Baltimore MD 21287 USA
| | - Yi Shi
- CAS Key Laboratory of Pathogenic Microbiology and ImmunologyInstitute of MicrobiologyChinese Academy of Sciences 100101 Beijing P. R. China
| | - Shisheng Sun
- College of Life ScienceNorthwest University Xi'an Shaanxi province 710069 P. R. China
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Li J, Li Z, Duan X, Qin K, Dang L, Sun S, Cai L, Hsieh-Wilson LC, Wu L, Yi W. An Isotope-Coded Photocleavable Probe for Quantitative Profiling of Protein O-GlcNAcylation. ACS Chem Biol 2019; 14:4-10. [PMID: 30620550 DOI: 10.1021/acschembio.8b01052] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
O-linked N-acetylglucosamine ( O-GlcNAc) is a ubiquitous post-translational modification of proteins and is essential for cell function. Quantifying the dynamics of O-GlcNAcylation in a proteome-wide level is critical for uncovering cellular mechanisms and functional roles of O-GlcNAcylation in cells. Here, we develop an isotope-coded photocleavable probe for profiling protein O-GlcNAcylation dynamics using quantitative mass spectrometry-based proteomics. This probe enables selective tagging and isotopic labeling of O-GlcNAcylated proteins in one step from complex cellular mixtures. We demonstrate the application of the probe to quantitatively profile O-GlcNAcylation sites in 293T cells upon chemical induction of O-GlcNAc levels. We further applied the probe to quantitatively analyze the stoichiometry of O-GlcNAcylation between sorafenib-sensitive and sorafenib-resistant liver cancer cells, which lays the foundation for mechanistic investigation of O-GlcNAcylation in regulating cancer chemoresistance. Thus, this probe provides a powerful tool to profile O-GlcNAcylation dynamics in cells.
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Affiliation(s)
- Jingchao Li
- MOE Laboratory of Biosystems Homeostasis & Protection, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Zhonghua Li
- MOE Laboratory of Biosystems Homeostasis & Protection, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiaotao Duan
- State Key Laboratory of Toxicology and Medical Countermeasures, Beijing Institute of Pharmacology and Toxicology, Beijing 100850, China
| | - Ke Qin
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Liuyi Dang
- College of Life Sciences, Northwest University, Xi’an 710069, China
| | - Shisheng Sun
- College of Life Sciences, Northwest University, Xi’an 710069, China
| | - Li Cai
- Department of Chemistry, University of South Carolina−Lancaster, Lancaster, South Carolina 29729, United States
| | - Linda C. Hsieh-Wilson
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Liming Wu
- The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
| | - Wen Yi
- MOE Laboratory of Biosystems Homeostasis & Protection, College of Life Sciences, Zhejiang University, Hangzhou 310058, China
- The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310003, China
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24
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Dang L, Zhang S. DFT-based theoretical prediction of intrinsic viscosity of polymer solutions. SAR QSAR Environ Res 2018; 29:1011-1021. [PMID: 30411641 DOI: 10.1080/1062936x.2018.1539035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Indexed: 06/08/2023]
Abstract
A four-descriptor quantitative structure-property relationship model was constructed to predict 65 intrinsic viscosities [η] of polymer solutions. Four quantum chemical descriptors, the traceless quadrupole moment θ(R), the hydrogen bond or electrostatic attraction descriptor QH, the partition function QBOT(R) and the frontier orbital descriptor EHOMO, were calculated with density functional theory at the B3LYP/6-31G(d) level and used to develop the model by multivariate linear regression (MLR) analysis. The model possesses coefficients of determination r2 of 0.827 for the training set and 0.808 for the test set, and shows better statistical characteristics than the existing MLR models of intrinsic viscosities [η] of polymer-solvent combinations. Moreover, the four descriptors were used to develop a support vector machine model for [η] that possesses a coefficient of determination r2 of 0.911 for the whole data set.
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Affiliation(s)
- L Dang
- a Hunan Provincial Key Laboratory of Environmental CataIysis & Waste Regeneration, Hunan Institute of Engineering , Xiangtan , China
- b College of Chemistry and Chemical Engineering, Hunan Institute of Engineering , Xiangtan , China
| | - S Zhang
- c Network Information Centre, Hunan Institute of Engineering , Xiangtan , China
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25
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Wang YQ, Liu XG, Jiang L, Wei F, Yu M, Wu FL, Dang L, Zhou H, Liu ZJ. [Treatment of subcutaneous fistula secondary to cerebrospinal fluid leakage in thoracic spinal stenosis cases]. Beijing Da Xue Xue Bao Yi Xue Ban 2018; 50:657-661. [PMID: 30122767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
OBJECTIVE To investigate the treatment strategy for subcutaneous fistula secondary to cerebrospinal fluid leakage (CSFL) in thoracic spinal stenosis (TSS) cases. METHODS In the study, 186 CSFL cases diagnosed with TSS and operated in general spine group of Department of Orthopedics, Peking University Third Hospital from January 2005 to December 2014 were retrospectively reviewed, of which eleven had subcutaneous fistula secondary to CSFL and were regularly followed up. Treatment strategy for subcutaneous fistula depended on the severity of CSFL and the recovery rate of thoracic myelopathy. Japanese Orthopedic Association (JOA) score was utilized to evaluate the neurologic status of these patients preoperatively and postoperatively. Statistical analysis was conducted between preoperative and postoperative JOA scores. RESULTS All of the 11 patients were regularly followed up for at least 24 months. Six of them had ossification of the posterior longitudinal ligament (OPLL) combined with ossification of ligamentum flavum (OLF), all of them undertook "cave-in" 360° circumferential decompression of the spinal cord with instrumentation. Five cases had OLF only, and received En bloc resection of lamina and OLF and fixation. The follow-up period ranged from 30 months to 131 months, and averaged at (85±34) months. Preoperative symptoms lasted from 3 months to 8 years, and the median was 18 months. Drainages were placed for 2-6 days, and averaged at (4.2±1.1) days. Ten cases appeared with fever during the perioperative period, the maximum body temperature was (37.3-39.7) °C. Prolonged antibiotics were applied in two cases with high fever. Ten cases were treated with conservative methods, CSFL were completely absorbed during the follow-up time, of which compressive dressing was utilized in 8 cases, and punctures combined with compressive dressing were used in 2 cases. For only 1 case, conservative therapy failed and reoperation was required because of neurological deterioration arising from CSF pseudocyst. For these 11 cases, preoperative JOA score arose from (3.8±1.6) preoperatively to (8.9±1.2) at the end of the final follow-up, the recovery rate was 70.8%. No infection of wound or central nerve system were noticed, and neither were unhealing wound. CONCLUSION Most TSS cases with subcutaneous fistula secondary to CSFL could be cured by conservative methods, and reoperation is required only if myelopathy caused by cerebrospinal fluid pseudocyst is identified.
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Affiliation(s)
- Y Q Wang
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - X G Liu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - L Jiang
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - F Wei
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - M Yu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - F L Wu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - L Dang
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - H Zhou
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
| | - Z J Liu
- Department of Orthopedics, Peking University Third Hospital, Beijing 100191, China
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26
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Van Holle S, De Schutter K, Eggermont L, Tsaneva M, Dang L, Van Damme EJM. Comparative Study of Lectin Domains in Model Species: New Insights into Evolutionary Dynamics. Int J Mol Sci 2017; 18:ijms18061136. [PMID: 28587095 PMCID: PMC5485960 DOI: 10.3390/ijms18061136] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2017] [Revised: 05/20/2017] [Accepted: 05/22/2017] [Indexed: 01/07/2023] Open
Abstract
Lectins are present throughout the plant kingdom and are reported to be involved in diverse biological processes. In this study, we provide a comparative analysis of the lectin families from model species in a phylogenetic framework. The analysis focuses on the different plant lectin domains identified in five representative core angiosperm genomes (Arabidopsisthaliana, Glycine max, Cucumis sativus, Oryza sativa ssp. japonica and Oryza sativa ssp. indica). The genomes were screened for genes encoding lectin domains using a combination of Basic Local Alignment Search Tool (BLAST), hidden Markov models, and InterProScan analysis. Additionally, phylogenetic relationships were investigated by constructing maximum likelihood phylogenetic trees. The results demonstrate that the majority of the lectin families are present in each of the species under study. Domain organization analysis showed that most identified proteins are multi-domain proteins, owing to the modular rearrangement of protein domains during evolution. Most of these multi-domain proteins are widespread, while others display a lineage-specific distribution. Furthermore, the phylogenetic analyses reveal that some lectin families evolved to be similar to the phylogeny of the plant species, while others share a closer evolutionary history based on the corresponding protein domain architecture. Our results yield insights into the evolutionary relationships and functional divergence of plant lectins.
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Affiliation(s)
- Sofie Van Holle
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Kristof De Schutter
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
- Department of Crop Protection, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Lore Eggermont
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Mariya Tsaneva
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Liuyi Dang
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Els J M Van Damme
- Department of Molecular Biotechnology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
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Wong J, Dang L, Le T, Phan N, James S, Katona P, Vu N, Vu T, Katona L, Rosen J, Nguyen C. Strengthening Health System - Evidence from the use of Bi-directional
SMS-based Screening and Feedback System to Improve Efficiency and Quality of
Disease Surveillance in Vietnam. Ann Glob Health 2017. [DOI: 10.1016/j.aogh.2017.03.270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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28
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Dang L, Rougé P, Van Damme EJM. Amaranthin-Like Proteins with Aerolysin Domains in Plants. Front Plant Sci 2017; 8:1368. [PMID: 28848572 PMCID: PMC5554364 DOI: 10.3389/fpls.2017.01368] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Accepted: 07/21/2017] [Indexed: 05/20/2023]
Abstract
Amaranthin is a homodimeric lectin that was first discovered in the seeds of Amaranthus caudatus and serves as a model for the family of amaranthin-like lectins. Though these lectins have been purified and characterized only from plant species belonging to the Amaranthaceae, evidence accumulated in recent years suggests that sequences containing amaranthin domains are widely distributed in plants. In this study, 84 plant genomes have been screened to investigate the distribution of amaranthin domains. A total of 265 sequences with amaranthin domains were retrieved from 34 plant genomes. Within this group of amaranthin homologs, 22 different domain architectures can be distinguished. The most common domain combination consists of two amaranthin domains followed by a domain with sequence similarity to aerolysin. The latter protein belongs to the group of β-pore-forming toxins produced by bacteria such as Aeromonas sp. and exerts its toxicity by making transmembrane pores in the target membrane, as such facilitating bacterial invasion. In addition, amaranthin domains also occur in association with five other protein domains, including the fascin domain, the alpha/beta hydrolase domain, the TRAF-like domain, the B box type zinc finger domain and the Bet v1 domain. All 16 amaranthin-like proteins retrieved from the cucumber genome possess a similar domain architecture consisting of two amaranthin domains linked to one aerolysin domain. Based on phylogenetic differences, four sequences were selected for further investigation. Subcellular localization studies revealed that the amaranthin-like proteins from cucumber reside in the cytoplasm and/or the nucleus. Analyses using qPCR showed that the transcript levels for the amaranthin-like sequences are typically low and expression levels vary among tissues during the development of cucumber plants. Furthermore, the expression of amaranthin-like genes is enhanced after different abiotic stresses, suggesting that these amaranthin-like proteins play a role in the stress response. Finally, molecular modeling was performed to unravel the structure of amaranthin-like proteins and their carbohydrate-binding sites. This study provided valuable information on the distribution, phylogenetic relationships, and possible biological roles of amaranthin-like proteins in plants.
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Affiliation(s)
- Liuyi Dang
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent UniversityGhent, Belgium
| | - Pierre Rougé
- UMR 152 PHARMA-DEV, Université de ToulouseToulouse, France
| | - Els J. M. Van Damme
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent UniversityGhent, Belgium
- *Correspondence: Els J. M. Van Damme,
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Dang L, Van Damme EJM. Genome-wide identification and domain organization of lectin domains in cucumber. Plant Physiol Biochem 2016; 108:165-176. [PMID: 27434144 DOI: 10.1016/j.plaphy.2016.07.009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 07/04/2016] [Accepted: 07/09/2016] [Indexed: 05/21/2023]
Abstract
Lectins are ubiquitous proteins in plants and play important roles in a diverse set of biological processes, such as plant defense and cell signaling. Despite the availability of the Cucumis sativus L. genome sequence since 2009, little is known with respect to the occurrence of lectins in cucumber. In this study, a total of 146 putative lectin genes belonging to 10 different lectin families were identified and localized in the cucumber genome. Domain architecture analysis revealed that most of these lectin gene sequences contain multiple domains, where lectin domains are linked with other domains, as such creating chimeric lectin sequences encoding proteins with dual activities. This study provides an overview of lectin motifs in cucumber and will help to understand their potential biological role(s).
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Affiliation(s)
- Liuyi Dang
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
| | - Els J M Van Damme
- Laboratory of Biochemistry and Glycobiology, Department of Molecular Biotechnology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium.
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Gao X, Li X, Qian C, Li F, Zhang Y, Dang L, Xiao X, Liu F, Li H, Zhang X. MiR-21 functions oppositely in proliferation and differentiation of neural stem/precursor cells via regulating AKT and GSK-3β. ACTA ACUST UNITED AC 2016; 62:144-149. [PMID: 28971796 DOI: 10.14715/cmb/2016.62.12.24] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Indexed: 11/18/2022]
Abstract
MicroRNA involves in regulating behavior of neural stem/precursor cells (NSPCs), thus it offers the potential to treat central nervous system disease. However, the effect of miR-21 on NSPCs remains unknown. In this study, we demonstrated that miR-21 reduced proliferation and promoted neural differentiation in NSPCs via regulating the activation of AKT and GSK-3β signaling pathways in vitro. During differentiation of NSPCs, the expression of miR-21 was increased in a time-dependent manner by qRT-PCR. Synthesized pre-miR-21 or anti-miR-21 was transfected into NSPCs, thereby efficiently overexpressing or knocking down miR-21. Overexpression of miR-21 promoted the neural differentiation of NSPCs, as indicated by Tuj1 and PSA-NCAM staining. Interestingly, knocking down miR-21 had the opposite effect of neural differentiation in NSPCs. However, in proliferation area, overexpression of miR-21 decreased the cell viability by 3-((2-methyl-1,3-thiazol-4-yl)ethynyl)pyridine hydrochloride (MTT) assay, and inhibited the proliferation of NSPCs, as indicated by 5-Bromo-2-deoxyUridine (BrdU) staining. And likewise, knocking down miR-21 had the opposite effect of cell viability and proliferation. Western blot showed that overexpression of miR-21 enhanced the expression of Cyclin D1, however, knocking down miR-21 prevented its expression. Furthermore, we revealed that protein kinase B (AKT) and glycogen synthase kinase-3 beta (GSK-3β) signaling pathways were involved in the proliferation and neural differentiation of NSPCs. Overexpression of miR-21 activated AKT, and the p-GSK-3β was increased. Conversely, knocking down miR-21 blocked the activation of AKT, and decreased the phosphorylation level of GSK-3β. These results demonstrated that miR-21 promotes neural differentiation and reduces proliferation in NSPCs via regulating AKT and GSK-3β pathways. These findings may help to develop strategies for treatment of central nervous system diseases.
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Affiliation(s)
- X Gao
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - X Li
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - C Qian
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - F Li
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - Y Zhang
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - L Dang
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - X Xiao
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - F Liu
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - H Li
- NO.215 Hospital of Shaanxi Nuclear Industry, #35 Weiyang West Road, Xianyang, Shaanxi 712000, China
| | - X Zhang
- Xi'an NO.3 Hospital, #10 No.3 Fengcheng Road, Xi'an, Shaanxi 710021, China
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Cartland S, Harith H, Vellozzi M, Genner S, Di Bartolo B, Dang L, Thomas S, Adams L, Kavurma M. Non-alcoholic Fatty Liver Disease (NAFLD) is Exacerbated with TRAIL Deletion, Associating with Vascular Inflammation and Insulin Resistance. Heart Lung Circ 2016. [DOI: 10.1016/j.hlc.2016.06.209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Dang L, Yen K, Attar E. IDH mutations in cancer and progress toward development of targeted therapeutics. Ann Oncol 2016; 27:599-608. [DOI: 10.1093/annonc/mdw013] [Citation(s) in RCA: 301] [Impact Index Per Article: 37.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2015] [Accepted: 12/24/2015] [Indexed: 12/29/2022] Open
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Dang L, Zheng X, Chang Q, Yang Y, Wang Y, Cai Y, Hei C, Wang H, Zhao C, Zhu W, Wang Y. Appropriate Osmotic Balance Duration for Different Volumes of Ovarian Tissue in Vitrification Solution: a Study of Ovary Tissue Vitrification and Transplantation in Sheep. Cryo Letters 2016; 37:365-378. [PMID: 27925004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
UNLABELLED BACKGROUND: Auto-transplantation of cryopreserved ovarian tissue has become a promising method for fertility preservation and standardization of the process is crucial for practical applications. OBJECTIVE Here we used different size of large sheep ovarian cortex to study the most suitable osmotic balance durations in the vitrification solution for large piece ovary cortex. MATERIALS AND METHODS The ovarian cortices from six-month old female sheep were divided into 40 cubic mm, 80 cubic mm and 160 cubic mm volume, A two-step osmotic balance method was used based on the results from morphological and histological study, we detected the expression of VEGF after thawing, the percentage of follicles that survived and serum E2 levels,together with apoptosis test by TUNEL. RESULTS the morphology of follicles and stromal cells were the best when the osmotic balance duration was 7 min, 11 min and 19 min, respectively. Osmotic balance time(T) is proportional to the area(S), we deduced that areas(S) of large pieces of ovarian cortex in vitrification fluid conformed to the standardized osmotic balance time(T) formula; i.e., T=(S+15)/5 (22~24C, sample thickness 1-2 mm), In vitro culture of vitrification-thawed large cortex ovaries and xenogenic heterotopic transplantation by using the standardized osmotic balance duration formula were both successful. CONCLUSION Formula T=(S+15)/5 can be used to calculate optimal osmotic balance duration for different size of ovarian cortexes during vitrification.
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Affiliation(s)
- L Dang
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - X Zheng
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - Q Chang
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - Y Yang
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - Y Wang
- Department of Histology and Embryology, XingTai Medical College, Ningxia, 75004, P.R. China
| | - Y Cai
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - C Hei
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - H Wang
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - C Zhao
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - W Zhu
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
| | - Y Wang
- Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, Key Laboratory of Reproduction and Genetics in Ningxia, Department of Histology and Embryology, Nursing school, Ningxia Medical University, Ningxia, 75004, P.R. China
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Zhong Y, Qin Y, Dang L, Jia L, Zhang Z, Wu H, Cui J, Bian H, Li Z. Alteration and localization of glycan-binding proteins in human hepatic stellate cells during liver fibrosis. Proteomics 2015; 15:3283-95. [PMID: 26058380 DOI: 10.1002/pmic.201500030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 04/16/2015] [Accepted: 06/05/2015] [Indexed: 01/10/2023]
Abstract
Glycan-binding proteins (GBPs) play an important role in cell adhesion, bacterial/viral infection, and cellular signaling pathways. However, little is known about the precision alteration of GBPs referred to pathological changes in hepatic stellate cells (HSCs) during liver fibrosis. Here, the carbohydrate microarrays were used to probe the alteration of GBPs in the activated HSCs and quiescent HSCs. As a result, 12 carbohydrates (e.g. Gal, GalNAc, and Man-9Glycan) showed increased signal, while seven carbohydrates (e.g. NeuAc, Lac, and GlcNAc-O-Ser) showed decreased signal in activated HSCs. Three carbohydrates (Gal, GalNAc, and NeuAc) were selected and subsequently used to validate the results of the carbohydrate microarrays as well as assess the distribution and localization of their binding proteins in HSCs and liver tissues by cy/histochemistry; the results showed that GBPs mainly distributed in the cytoplasma membrane and perinuclear region of cytoplasm. The immunocytochemistry was further used to verify some GBPs really exist in Golgi apparatus of the cells. The precision alteration and localization of GBPs referred to pathological changes in HSCs may provide pivotal information to help understand the biological functions of glycans how to exert through their recognition by a wide variety of GBPs. This study could lead to the development of new anti-fibrotic strategies.
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Affiliation(s)
- Yaogang Zhong
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Yannan Qin
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Liuyi Dang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Liyuan Jia
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Zhiwei Zhang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Haoxiang Wu
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Jihong Cui
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
| | - Huijie Bian
- Cell Engineering Research Centre and Department of Cell Biology, Fourth Military Medical University, Xi'an, P. R. China
| | - Zheng Li
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, P. R. China
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Abstract
Plants have evolved to synthesize a variety of noxious compounds to cope with unfavorable circumstances, among which a large group of toxic proteins that play a critical role in plant defense against predators and microbes. Up to now, a wide range of harmful proteins have been discovered in different plants, including lectins, ribosome-inactivating proteins, protease inhibitors, ureases, arcelins, antimicrobial peptides and pore-forming toxins. To fulfill their role in plant defense, these proteins exhibit various degrees of toxicity towards animals, insects, bacteria or fungi. Numerous studies have been carried out to investigate the toxic effects and mode of action of these plant proteins in order to explore their possible applications. Indeed, because of their biological activities, toxic plant proteins are also considered as potentially useful tools in crop protection and in biomedical applications, such as cancer treatment. Genes encoding toxic plant proteins have been introduced into crop genomes using genetic engineering technology in order to increase the plant's resistance against pathogens and diseases. Despite the availability of ample information on toxic plant proteins, very few publications have attempted to summarize the research progress made during the last decades. This review focuses on the diversity of toxic plant proteins in view of their toxicity as well as their mode of action. Furthermore, an outlook towards the biological role(s) of these proteins and their potential applications is discussed.
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Affiliation(s)
- Liuyi Dang
- Ghent University, Dept. Molecular Biotechnology, Laboratory Biochemistry and Glycobiology, 9000 Gent, Belgium.
| | - Els J M Van Damme
- Ghent University, Dept. Molecular Biotechnology, Laboratory Biochemistry and Glycobiology, 9000 Gent, Belgium.
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He L, Dang L, Zhou J, Bai J, Li YZ. Association of angiopoietin-1, angiopoietin-2 and caspase-5 polymorphisms with psoriasis vulgaris. Clin Exp Dermatol 2015; 40:556-63. [PMID: 25753570 DOI: 10.1111/ced.12550] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/04/2014] [Indexed: 11/30/2022]
Affiliation(s)
- L. He
- Department of Dermatology; Second Affiliated Hospital of Harbin Medical University; Harbin China
| | - L. Dang
- Department of Dermatology; Second Affiliated Hospital of Harbin Medical University; Harbin China
| | - J. Zhou
- Department of Dermatology; Second Affiliated Hospital of Harbin Medical University; Harbin China
| | - J. Bai
- Laboratory of Medical Genetics; Harbin Medical University; Harbin China
| | - Y.-Z. Li
- Department of Dermatology; Second Affiliated Hospital of Harbin Medical University; Harbin China
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Zhou J, Wang L, Wang F, Xu P, Li Y, Bai B, Dang L, Sun D. 4q27 as a psoriasis susceptibility locus in the Northeastern Chinese Han population. ACTA ACUST UNITED AC 2014; 85:15-9. [PMID: 25495849 DOI: 10.1111/tan.12471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2014] [Revised: 09/23/2014] [Accepted: 10/13/2014] [Indexed: 01/19/2023]
Abstract
Psoriasis is an autoimmune inflammatory skin disease with genetic components. Chromosome 4q27 is related to many autoimmune diseases, however, the relationship between psoriasis and 4q27 has not been fully established yet. The objective of this study is to investigate the association between chromosome 4q27 and psoriasis in the Northeastern Chinese Han population. Four common single nucleotide polymorphisms (rs2069762, rs4833837, rs6840978, and rs7684187) from chromosome 4q27 were genotyped in 400 psoriasis cases and 398 controls from the Northeastern Chinese Han population using the Multiplex SNaPSHOT method. Single nucleotide polymorphism and haplotype frequencies were analyzed using spss 13.0. Our data indicated that rs2069762 GG, TG genotypes [GG: odds ratio (OR) = 2.6875, 95% confidence interval (CI) = 1.5948-4.5290, P < 0.0001; TG: OR = 1.6159, 95% CI = 1.2044-2.1681, P = 0.0013], and H3 haplotype (OR = 1.717, 95% CI = 1.050-2.808, P = 0.030) increased the risk of psoriasis. Furthermore, rs4833837 GG, GA genotypes (GG: OR = 0.2071, 95% CI = 0.0685-0.6266, P = 0.0022; GA: OR = 0.4711, 95% CI = 0.3289-0.6746, P < 0.0001), and H5 haplotype (OR = 0.482, 95% CI = 0.238-0.978, P = 0.039) were identified as protective factors for psoriasis. 4q27 polymorphisms are associated with psoriasis in the Northeastern Chinese Han population.
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Affiliation(s)
- J Zhou
- Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, PR China
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Wang F, Travins J, DeLaBarre B, Penard-Lacronique V, Schalm S, Hansen E, Straley K, Kernytsky A, Liu W, Gliser C, Yang H, Gross S, Artin E, Saada V, Mylonas E, Quivoron C, Popovici-Muller J, Saunders JO, Salituro FG, Yan S, Murray S, Wei W, Gao Y, Dang L, Dorsch M, Agresta S, Schenkein DP, Biller SA, Su SM, Botton SD, Yen KE. Abstract PL02-04: IDH mutations and tumorigenicity. Mol Cancer Ther 2013. [DOI: 10.1158/1535-7163.targ-13-pl02-04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Mutations in the isocitrate dehydrogenase 1 (IDH1) and 2 (IDH2) genes are present in ∼20% of acute myeloid leukemia, and cause a neomorphic enzyme activity that results in the production of 2-hydroxyglutarate (2HG). Mutational and epigenetic profiling of a large patient cohort of acute myeloid leukemia (AML) has revealed that IDH1/2-mutant AMLs display global DNA hypermethylation and impaired hematopoietic differentiation.
To further investigate the intrinsic effect of 2HG on hematopoietic proliferation and differentiation, we transfected an erythroleukemia cell line (TF-1) with either IDH1 or IDH2 mutant alleles. These cells overexpress the mutant enzyme, have high levels of 2HG, and exhibit GM-CSF independent growth. Consistent with clinical observations, overexpression of the IDH mutant proteins led to hypermethylation of both histones and DNA. These results suggest that mutations in IDH1/2 could lead to epigenetic rewiring of cells that could facilitate the gain of function phenotype. We are currently studying the global and specific effects of IDH1/2 mutant overexpression to gain a broader understanding of the biological consequence of the IDH1/2 gain of function mutations.
We have also generated mutation selective molecules that are capable of inhibiting IDHm enzymes. Upon compound treatment in vitro, we are able to reverse hypermethylation of both histones and DNA and induce cellular differentiation in IDHm cell lines and primary human IDHm AML patient samples(1, 2). These data suggest that an inhibitor of IDH1/2 mutations could correct the altered gene expression patterns seen in IDH1/2 mutant AML tumors leading to a profound effect on hematopoietic differentiation, proliferation and tumor growth.
Citation Information: Mol Cancer Ther 2013;12(11 Suppl):PL02-04.
Citation Format: F. Wang, J. Travins, B. DeLaBarre, V. Penard-Lacronique, S. Schalm, E. Hansen, K. Straley, A. Kernytsky, W. Liu, C. Gliser, H. Yang, S. Gross, E. Artin, V Saada, E. Mylonas, C. Quivoron, J. Popovici-Muller, J. O. Saunders, F. G. Salituro, S. Yan, S. Murray, W. Wei, Y. Gao, L. Dang, M. Dorsch, S. Agresta, D. P. Schenkein, S. A. Biller, S. M. Su, S. de Botton, Katharine E. Yen. IDH mutations and tumorigenicity. [abstract]. In: Proceedings of the AACR-NCI-EORTC International Conference: Molecular Targets and Cancer Therapeutics; 2013 Oct 19-23; Boston, MA. Philadelphia (PA): AACR; Mol Cancer Ther 2013;12(11 Suppl):Abstract nr PL02-04.
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Affiliation(s)
- F. Wang
- 1Agios Pharmaceuticals, Cambridge, MA
| | | | | | - V. Penard-Lacronique
- 2Institut National de la Santé et de la Recherche Médicale, INSERM U985, F-94805, Villejuif, France
| | - S. Schalm
- 1Agios Pharmaceuticals, Cambridge, MA
| | - E. Hansen
- 1Agios Pharmaceuticals, Cambridge, MA
| | | | | | - W. Liu
- 1Agios Pharmaceuticals, Cambridge, MA
| | - C. Gliser
- 1Agios Pharmaceuticals, Cambridge, MA
| | - H. Yang
- 1Agios Pharmaceuticals, Cambridge, MA
| | - S. Gross
- 1Agios Pharmaceuticals, Cambridge, MA
| | - E. Artin
- 1Agios Pharmaceuticals, Cambridge, MA
| | - V Saada
- 3Institut Gustave Roussy, F-94805, Villejuif, France
| | - E. Mylonas
- 2Institut National de la Santé et de la Recherche Médicale, INSERM U985, F-94805, Villejuif, France
| | - C. Quivoron
- 2Institut National de la Santé et de la Recherche Médicale, INSERM U985, F-94805, Villejuif, France
| | | | | | | | - S. Yan
- 4Schrödinger, Inc., New York, NY
| | - S. Murray
- 1Agios Pharmaceuticals, Cambridge, MA
| | - W. Wei
- 5Viva Biotech, Shanghai, China
| | - Y. Gao
- 6Shanghai ChemPartner Co., Shanghai, China
| | - L. Dang
- 1Agios Pharmaceuticals, Cambridge, MA
| | - M. Dorsch
- 1Agios Pharmaceuticals, Cambridge, MA
| | | | | | | | - S. M. Su
- 1Agios Pharmaceuticals, Cambridge, MA
| | - S. de Botton
- 2Institut National de la Santé et de la Recherche Médicale, INSERM U985, F-94805, Villejuif, France
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Qin Y, Zhong Y, Zhu M, Dang L, Yu H, Chen Z, Chen W, Wang X, Zhang H, Li Z. Age- and sex-associated differences in the glycopatterns of human salivary glycoproteins and their roles against influenza A virus. J Proteome Res 2013; 12:2742-54. [PMID: 23590532 DOI: 10.1021/pr400096w] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Recent studies have elucidated that expression of certain glycoproteins in human saliva is increased or decreased according to age; meanwhile, human saliva may inhibit viral infection and prevent viral transmission. However, little is known about the age- and sex-associated differences in the glycopatterns of human salivary glycoproteins and their significant roles against influenza A virus (IVA). Here, we investigate the glycopatterns of human salivary glycoproteins with 180 healthy saliva samples divided into six age/sex groups using lectin microarrays and fabricate saliva microarrays to validate the terminal carbohydrate moieties of glycoproteins in individual saliva samples. Furthermore, we assess the inhibiting and neutralizing activity of saliva against two strains of influenza A (H9N2) virus. We find that seven lectins (e.g., MAL-II and SNA) show significant age differences in both females and males, and seven lectins (e.g., WFA and STL) show significant sex differences in children, adults and elderly people. Interestingly, we observe that elderly individuals have strongest resistance to IVA partly by presenting more terminal α2-3/6-linked sialic acid residues in their saliva, which bind with the influenza viral hemagglutinations. We conclude that age- and sex-associated differences in the glycopatterns of human salivary glycoproteins may provide pivotal information to help understand some age related diseases and physiological phenomena.
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Affiliation(s)
- Yannan Qin
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an 710069, China
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Yang G, Chu W, Zhang H, Sun X, Cai T, Dang L, Wang Q, Yu H, Zhong Y, Chen Z, Yang F, Li Z. Isolation and identification of mannose-binding proteins and estimation of their abundance in sera from hepatocellular carcinoma patients. Proteomics 2013; 13:878-92. [PMID: 23300094 DOI: 10.1002/pmic.201200018] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Revised: 09/19/2012] [Accepted: 12/11/2012] [Indexed: 12/19/2022]
Abstract
The interaction of glycan-binding proteins (GBPs) and glycans plays a significant biological role that ranges from cell-cell recognition to cell trafficking, and glycoprotein targeting. The anomalies of GBPs related to the types and/or quantities were not clearly known in cancer incidence. It is imperative to identify and annotate the GBPs related with the canceration. Here the mannose-binding proteins (MBPs) from the clinical sera were isolated and identified by the mannose-magnetic particle conjugates and the high-accuracy MS analysis. Seventy-five MBPs from normal donors' sera and 79 MBPs from hepatocellular carcinoma patients' sera were identified and annotated. By using the stringent criteria of exponentially modified protein abundance index (emPAI) quantification, 12 MBPs were estimated to be significantly upregulated (emPAI ratio > 4) and nine MBPs were estimated to be significantly downregulated (emPAI ratio < 0.25) in the hepatocellular carcinoma sera. Real-time quantitative PCR, Western blotting, and protein microarrays were also used to confirm the altered MBPs expression level and the specific binding between the isolated MBPs and mannose. The sequence recognition motifs and structure preference of the isolated MBPs were characterized. The functional enrichment analysis revealed that over 57% of the isolated MBPs were binding protein and the upregulated MBPs were involved in cell death, tumor progression, and macromolecular complex remodeling.
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Affiliation(s)
- Ganglong Yang
- Laboratory for Functional Glycomics, College of Life Sciences, Northwest University, Xi'an, China
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Zhang M, Dang L, Guo F, Wang X, Zhao W, Zhao R. Coenzyme Q(10) enhances dermal elastin expression, inhibits IL-1α production and melanin synthesis in vitro. Int J Cosmet Sci 2012; 34:273-9. [PMID: 22339577 DOI: 10.1111/j.1468-2494.2012.00713.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Coenzyme Q(10) (CoQ(10) ) is a well-known antioxidant and has been used in many skincare products for anti-ageing purpose. However, the molecular mechanisms of CoQ(10) function in skin cells are not fully understood. In this paper, we compared the effects of CoQ(10) on primary human dermal fibroblasts from three individuals, including adult. We demonstrated that CoQ(10) treatment promoted proliferation of fibroblasts, increased type IV collagen expression and reduced UVR-induced matrix metalloproteinases-1 (MMP-1) level in embryonic and adult cells. In addition, CoQ(10) treatment increased elastin gene expression in cultured fibroblasts and significantly decreased UVR-induced IL-1α production in HaCat cells. Taken together, CoQ(10) presented anti-ageing benefits against intrinsic ageing as well as photo damage. Interestingly, CoQ(10) was able to inhibit tyrosinase activity, resulting in reduced melanin content in B16 cells. Thus, CoQ(10) may have potential depigmentation effects for skincare.
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Affiliation(s)
- M Zhang
- The Space Biology Research and Technology Center, China Aerospace Science and Technology Corporation, Beijing, China
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Dang L, Walker Renninger L, Fletcher D. Attention vs. The Eye: Which stabilizes fixation? J Vis 2010. [DOI: 10.1167/10.7.502] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Dang L, Walker Renninger L, Fletcher D. Stability of eccentric attention. J Vis 2010. [DOI: 10.1167/9.8.393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Yevseyenkov VV, Das S, Lin D, Willard L, Davidson H, Sitaramayya A, Giblin FJ, Dang L, Takemoto DJ. Loss of protein kinase Cgamma in knockout mice and increased retinal sensitivity to hyperbaric oxygen. ACTA ACUST UNITED AC 2009; 127:500-6. [PMID: 19365031 DOI: 10.1001/archophthalmol.2009.31] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVE To determine if loss of protein kinase Cgamma (PKCgamma) results in increased structural damage to the retina by hyperbaric oxygen (HBO), a treatment used for several ocular disorders. METHODS Six-week-old mice were exposed in vivo to 100% HBO 3 times a week for 8 weeks. Eyes were dissected, fixed, embedded in Epon, sectioned, stained with toluidine blue O, and examined by light microscopy. RESULTS The thicknesses of the inner nuclear and ganglion cell layers were increased. Destruction of the outer plexiform layer was observed in the retinas of the PKCgamma-knockout mice relative to control mice. Exposure to HBO caused significant degradation of the retina in knockout mice compared with control mice. Damage to the outer segments of the photoreceptor layer and ganglion cell layer was apparent in central retinas of HBO-treated knockout mice. CONCLUSIONS Protein kinase Cgamma-knockout mice had increased retinal sensitivity to HBO. Results demonstrate that PKCgamma protects retinas from HBO damage. CLINICAL RELEVANCE Care should be taken in treating patients with HBO, particularly if they have a genetic disease, such as spinocerebellar ataxia type 14, a condition in which the PKCgamma is mutated and nonfunctional.
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Affiliation(s)
- Vladimir V Yevseyenkov
- Department of Biochemistry, 141 Chalmers Hall, Kansas State University, Manhattan, Kansas 66506, USA
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O’Shaughnessy MJ, Vogtenhuber C, Sun K, Sitcheran R, Baldwin AS, Murphy WJ, Dang L, Jaffee B, Palmer E, Serody JS, Blazar BR. Ex vivo inhibition of NF-kappaB signaling in alloreactive T-cells prevents graft-versus-host disease. Am J Transplant 2009; 9:452-62. [PMID: 19260829 PMCID: PMC2680009 DOI: 10.1111/j.1600-6143.2008.02533.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The ex vivo induction of alloantigen-specific hyporesponsiveness by costimulatory pathway blockade or exposure to immunoregulatory cytokines has been shown to inhibit proliferation, IL-2 production, and the graft-versus-host disease (GVHD) capacity of adoptively transferred T-cells. We hypothesized that inhibition of the intracellular NF-kappaB pathway in alloreactive T-cells, which is critical for T-cell activation events including IL-2 transcription, could lead to alloantigen hyporesponsiveness and loss of GVHD capacity. We demonstrate that treatment of mixed lymphocyte reaction (MLR) cultures with PS1145, a potent inhibitor of NF-kappaB activation, can induce T-cell hyporesponsiveness to alloantigen in primary and secondary responses while preserving in vitro responses to potent mitogenic stimulation. GVHD lethality in recipients of ex vivo PS1145-treated cells was profoundly inhibited. Parking of control or PS1145-treated MLR cells in syngeneic Rag(-/-) recipients resulted in intact contact hypersensitivity (CHS) responses. However, GVHD lethality capacity also was restored, suggesting that lymphopenic expansion uncoupled alloantigen hyporesponsiveness. These results indicate that the NF-kappaB pathway is a critical regulator of alloresponses and provide a novel small molecule inhibitor based approach that is effective in preventing early posttransplant GVHD lethality but that also permits donor T-cell responses to recover after a period of lymphopenic expansion.
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Affiliation(s)
- M. J. O’Shaughnessy
- University of Minnesota Cancer Center and Department of Pediatrics, Division of Bone Marrow Transplantation, Minneapolis, MN 55455, USA
| | - C. Vogtenhuber
- University of Minnesota Cancer Center and Department of Pediatrics, Division of Bone Marrow Transplantation, Minneapolis, MN 55455, USA
| | - K. Sun
- University of Nevada, Department of Microbiology and Immunology, Reno, NV 89557, USA
| | - R. Sitcheran
- University of North Carolina-Chapel Hill, Lineberger Cancer Center, Chapel Hill, NC, USA
| | - A. S. Baldwin
- University of North Carolina-Chapel Hill, Lineberger Cancer Center, Chapel Hill, NC, USA
| | - W. J. Murphy
- University of Nevada, Department of Microbiology and Immunology, Reno, NV 89557, USA
| | - L. Dang
- Millennium Pharmaceuticals, Cambridge, MA, USA
| | - B. Jaffee
- Millennium Pharmaceuticals, Cambridge, MA, USA
| | - E. Palmer
- Laboratory of Transplantation Immunology and Nephrology, Department of Research, University Hospital-Basel, CH-4031 Basel, Switzerland
| | - J. S. Serody
- University of North Carolina-Chapel Hill, Lineberger Cancer Center, Chapel Hill, NC, USA
| | - B. R. Blazar
- University of Minnesota Cancer Center and Department of Pediatrics, Division of Bone Marrow Transplantation, Minneapolis, MN 55455, USA
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Affiliation(s)
- J. Y. Qi
- State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Center for Theoretical Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
| | - L. Dang
- State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Center for Theoretical Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
| | - M. D. Chen
- State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Center for Theoretical Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
| | - W. Wu
- State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Center for Theoretical Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
| | - Q. E. Zhang
- State Key Laboratory of Physical Chemistry of Solid Surface, Department of Chemistry, Center for Theoretical Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, People’s Republic of China
| | - C. T. Au
- Department of Chemistry, Hong Kong Baptist University, Kowloon Tong, Hong Kong, People’s Republic of China
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Haissaguerre M, Lim KT, Jacquemet V, Rotter M, Dang L, Hocini M, Matsuo S, Knecht S, Jais P, Virag N. Atrial fibrillatory cycle length: computer simulation and potential clinical importance. Europace 2007; 9 Suppl 6:vi64-70. [DOI: 10.1093/europace/eum208] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Polk JE, Marrese-Reading CM, Thornber B, Dang L, Johnson LK, Katz I. Scanning optical pyrometer for measuring temperatures in hollow cathodes. Rev Sci Instrum 2007; 78:093101. [PMID: 17902941 DOI: 10.1063/1.2774828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Life-limiting processes in hollow cathodes are determined largely by the temperature of the electron emitter. To support cathode life assessment, a noncontact temperature measurement technique which employs a stepper motor-driven fiber optic probe was developed. The probe is driven inside the hollow cathode and collects light radiated by the hot interior surface of the emitter. Ratio pyrometry is used to determine the axial temperature profile. Thermocouples on the orifice plate provide measurements of the external temperature during cathode operation and are used to calibrate the pyrometer system in situ with a small oven enclosing the externally heated cathode. The diagnostic method and initial measurements of the temperature distribution in a hollow cathode are discussed.
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Affiliation(s)
- J E Polk
- Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California 91109, USA
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Abstract
We report a case of a 52-year-old female patient with known cerebral cavernomas and acute headache. A cranial CT scan excluded an intracranial bleeding. Cavernomas are rare vascular malformations of the venous blood system (synon. cavernous angiomas) with a slow blood flow. Clinical manifestation is presented between an age of 30-50 years with mostly unspecific neurological symptoms like headache, nausea, vomiting and dizziness, but also epileptic seizures and bleedings may occur. In general, therapy is symptomatic. In cases of seizures, however, anticonvulsive treatment is indicated. Operation can be discussed for peripheral localized cavernomas with bleeding or for refractory seizures. If antiplatelet or anticoagulation therapy is necessary due to other diseases (coronary heart disease, atrial fibrillation, thrombosis, pulmonary embolism), cerebral cavernomas are not considered as an absolute contraindication. The risk for an ischemic stroke under atrial fibrillation (5-20%), for example, is higher than the risk for bleeding of a cerebral cavernoma under anticoagulation therapy.
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Affiliation(s)
- N Schwarz
- Notfallzentrum Medizin, Inselspital Bern
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