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Chen Q, Wang Q, Bu C, An Z, Jin L, Chi L. Inhibition of catechol-O-methyltransferase (COMT) by heparin oligosaccharides with specific structures. Carbohydr Polym 2024; 332:121909. [PMID: 38431413 DOI: 10.1016/j.carbpol.2024.121909] [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: 12/15/2023] [Revised: 01/30/2024] [Accepted: 01/31/2024] [Indexed: 03/05/2024]
Abstract
COMT inhibitors are commonly used to improve the effectiveness of levodopa in treating Parkinson's disease by inhibiting its conversion to 3-O-methyldopa. Because of the serious side effect of nitrocatechol COMT inhibitors, it is necessary to develop non-nitrocatechol COMT inhibitors with a higher safety profile. Heparin has been observed to bind to COMT. However, the exact functional significance of this interaction is not fully understood. In this study, the contribution of different substitution of heparin to its binding with COMT was investigated. In vitro and in vivo, heparin oligosaccharides can bind to COMT and inhibit its activity. Furthermore, we enriched the functional heparin oligosaccharides that bind to COMT and identified the sequence UA2S-GlcN(S/Ac)6(S/H)-UA2S-GlcNS6(S/H)-UA2(S/H)-GlcNS6S as the characteristic structural domain of these functional oligosaccharides. This study has elucidated the relationship between the structure of heparin oligosaccharides and their activity against COMT, providing valuable insights for the development of non-nitrocatechol COMT inhibitors with improved safety and efficacy.
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Affiliation(s)
- Qingqing Chen
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Qingchi Wang
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China; Xianghu Laboratory, 168 Gongwen Rd, Hangzhou 311231, China
| | - Changkai Bu
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Zizhe An
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Lan Jin
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China.
| | - Lianli Chi
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China.
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Chen Y, Li D, Wang L, Bu C, Li Y, Wang Y, Xu Y, Yan G, Zhang B. [Investigation of Anisakis infections in coastal marine fishes and awareness of anisakiasis control knowledge among residents in Yantai City in 2021]. Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi 2024; 36:74-78. [PMID: 38604688 DOI: 10.16250/j.32.1374.2023135] [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] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
OBJECTIVE To investigate the prevalence of Anisakis infections in coastal marine fishes and awareness of anisakiasis control knowledge among local residents in Yantai City, Shandong Province in 2021, so as to provide insights into formulation of anisakiasis control interventions. METHODS Marine fishes were purchased from Shunxin Port, Yantai City, Shandong Province in November 2021, and the presence of Anisakis was detected in different species of fishes and different fish sites. The correlations between body length and weight of marine fish and intensity of Anisakis infections were examined using Spearman's rank correlation analysis, and the dietary habits and anisakiasis control knowledge were investigated using questionnaire surveys among local residents. RESULTS A total of 201 marine fishes belonging to 20 species were dissected, and Anisakis was detected in 77 marine fishes (38.31%) belonging to 11 species (55.00%), with a mean infection intensity of 45.04 parasites per fish (3 468/77). Spearman's rank correlation analysis revealed that the body length (rs = 0.74, P < 0.05) and weight (rs = 0.79, P < 0.01) of the monkfish correlated positively with the intensity of Anisakis infections, and the body length (rs = 0.68, P < 0.05) of the flatfish correlated positively with the intensity of Anisakis infections, while no correlations were examined between the body length or weight of other marine fishes and the intensity of Anisakis infections. Of all respondents, 53.38% men and 56.67% women did not know anisakiasis control knowledge at all, and there was a significant difference in the proportion of respondents using separate chopping boards for raw and cooked food from different villages (χ2 = 17.89, P < 0.01), while there was an age-specific proportion of respondents with habitats of eating raw or semi-raw seafood (χ2 = 28.27, P < 0.01). CONCLUSIONS The prevalence and intensity of Anisakis infections were high in coastal marine fishes in Yantai City in 2021, and the awareness of anisakiasis control knowledge was low among local residents. Intensified health education pertaining to anisakiasis control knowledge is recommended to reduce the risk of Anisakis infections.
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Affiliation(s)
- Y Chen
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - D Li
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - L Wang
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - C Bu
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - Y Li
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - Y Wang
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - Y Xu
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - G Yan
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
| | - B Zhang
- Shandong Institute of Parasitic Diseases; Shandong First Medical University & Shandong Academy of Medical Sciences, Jining, Shandong 272000, China
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Wang Q, Bu C, Wang H, Zhang B, Chen Q, Shi D, Chi L. Distinct mechanisms underlying the therapeutic effects of low-molecular-weight heparin and chondroitin sulfate on Parkinson's disease. Int J Biol Macromol 2024; 262:129846. [PMID: 38296150 DOI: 10.1016/j.ijbiomac.2024.129846] [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: 08/17/2023] [Revised: 01/26/2024] [Accepted: 01/28/2024] [Indexed: 02/09/2024]
Abstract
Parkinson's disease (PD) is a neurodegenerative disorder influenced by various factors, including age, genetics, and the environment. Current treatments provide symptomatic relief without impeding disease progression. Previous studies have demonstrated the therapeutic potential of exogenous heparin and chondroitin sulfate in PD. However, their therapeutic mechanisms and structure-activity relationships remain poorly understood. In this study, low-molecular-weight heparin (L-HP) and chondroitin sulfate (L-CS) exhibited favorable therapeutic effects in a mouse model of PD. Proteomics revealed that L-HP attenuated mitochondrial dysfunction through its antioxidant properties, whereas L-CS suppressed neuroinflammation by inhibiting platelet activation. Two glycosaminoglycan (GAG)-binding proteins, manganese superoxide dismutase (MnSOD2) and fibrinogen beta chain (FGB), were identified as potential targets of L-HP and L-CS, and we investigated their structure-activity relationships. The IdoA2S-GlcNS6S/GlcNAc6S unit in HP bound to SOD2, whereas the GlcA-GalNAc4S and GlcA-GalNAc4S6S units in CS preferred FGB. Furthermore, N-S and 2-O-S in L-HP, and 4-O-S, 6-O-S, and -COOH in L-CS contributed significantly to the binding process. These findings provide new insights and evidence for the development and use of glycosaminoglycan-based therapeutics for PD.
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Affiliation(s)
- Qingchi Wang
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China; Xianghu Laboratory, Hangzhou 311231, China
| | - Changkai Bu
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Haoran Wang
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Bin Zhang
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Qingqing Chen
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Deling Shi
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China
| | - Lianli Chi
- National Glycoengineering Research Center and Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, 72 Binhai Rd, Qingdao 266200, China.
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An Z, Bu C, Shi D, Chen Q, Zhang B, Wang Q, Jin L, Chi L. Structurally defined heparin octasaccharide domain for binding to SARS-CoV-2 Omicron BA.4/BA.5/BA.5.2 spike protein RBD. Int J Biol Macromol 2024; 259:129032. [PMID: 38159696 DOI: 10.1016/j.ijbiomac.2023.129032] [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: 06/26/2023] [Revised: 11/15/2023] [Accepted: 11/30/2023] [Indexed: 01/03/2024]
Abstract
Heparin, a bio-molecule with the highest negative charge density, is pharmaceutically important to prevent SARS-CoV-2 infection due to its strong competitive binding to spike protein compared with cellular heparan sulfate, which was confirmed as a co-receptor for virus-host cell interaction. Hence, the refined structural characterization of heparin targeting viral protein-HS interaction was significant for developing antiviral pharmaceuticals. In our study, heparin oligomers (dp ≥ 4) were prepared using heparinase I. The affinity oligosaccharides binding to Omicron spike protein RBD were separated by affinity chromatography and size exclusion chromatography. HILIC-ESI-FTMS was used for chain mapping analysis. The basic building blocks were analyzed and the binding domain sequence was produced by Seq-GAG software and further measured by SAX chromatography. As results, heparin octasaccharide was found with significantly higher binding ability than hexasaccharide and tetrasaccharide, and the octasaccharide [ΔUA-GlcNS6S-GlcA-GlcNS6S-IdoA2S-GlcNS6S-IdoA2S-GlcNS6S] with 12 sulfate groups showed high binding to RBD. The mechanism of this structurally well-defined octasaccharide binding to RBD was further investigated by molecular docking. The affinity energy of optimal pose was -6.8 kcal/mol and the basic amino acid residues in RBD sequence (Arg403, Arg452, Arg493 and His505) were identified as the major contribution factor to interacting with sulfate/carboxyl groups on saccharide chain. Our study demonstrated that heparin oligosaccharide with well-defined structure could be potentially developed as anti-SARS-CoV-2 drugs.
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Affiliation(s)
- Zizhe An
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Changkai Bu
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Deling Shi
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Qingqing Chen
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Bin Zhang
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Qingchi Wang
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China
| | - Lan Jin
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China.
| | - Lianli Chi
- National Glycoengineering Research Center, Shandong University, No. 72, Binhai Road, Qingdao, Shandong Province 266237, China.
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Shi D, Zhao H, Bu C, Fraser K, Wang H, Dordick JS, Linhardt RJ, Zhang F, Shi F, Chi L. New insights into the binding of PF4 to long heparin oligosaccharides in ultralarge complexes using mass spectrometry. J Thromb Haemost 2023; 21:3608-3618. [PMID: 37648114 DOI: 10.1016/j.jtha.2023.08.020] [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: 03/27/2023] [Revised: 08/18/2023] [Accepted: 08/18/2023] [Indexed: 09/01/2023]
Abstract
BACKGROUND Heparin-induced thrombocytopenia (HIT) is a serious complication caused by heparin drugs. The ultralarge complexes formed by platelet factor 4 (PF4) with heparin or low molecular weight heparins (LMWHs) are important participants in inducing the immune response and HIT. OBJECTIVES We aim at characterizing the interaction between PF4 and long-chain heparin oligosaccharides and providing robust analytical methods for the analysis of PF4-heparin complexes. METHODS In this work, the characteristics of PF4-enoxaparin complexes after incubation in different molar ratios and concentrations were analyzed by multiple analytical methods, especially liquid chromatography-mass spectrometry and liquid chromatography-tandem mass spectrometry with multiple reaction monitoring were developed to qualitatively and quantitatively monitor heparin oligosaccharides and PF4 in HIT-inducing complexes. RESULTS The results showed that the largest proportion of ultralarge complexes formed by PF4 and enoxaparin was at a specific molar ratio, ie, a PF4/enoxaparin ratio of 2:1, while the ultralarge complexes contained PF4 tetramer and enoxaparin at a molar ratio of approximately 2:1. CONCLUSION A binding model of PF4 and enoxaparin in ultralarge complexes is proposed with one heparin oligosaccharide chain (∼ dp18) bound to 2 PF4 tetramers in different morphologies to form ultralarge complexes, while PF4 tetramer is surrounded by multiple heparin chains in smaller complexes. Our study provides new insights into the structural mechanism of PF4-LMWH interaction, which help to further understand the mechanism of LMWH immunogenicity and develop safer heparin products.
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Affiliation(s)
- Deling Shi
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province, China; Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Huimin Zhao
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province, China
| | - Changkai Bu
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province, China
| | - Keith Fraser
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Haoran Wang
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province, China
| | - Jonathan S Dordick
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Robert J Linhardt
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, New York, USA
| | - Fuming Zhang
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA; Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York, USA.
| | - Feng Shi
- Shandong Institute for Food and Drug Control, Jinan, Shandong Province, China.
| | - Lianli Chi
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province, China.
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Chen J, Meng L, Bu C, Zhang C, Wu P. Feature pyramid network-based computer-aided detection and monitoring treatment response of brain metastases on contrast-enhanced MRI. Clin Radiol 2023; 78:e808-e814. [PMID: 37573242 DOI: 10.1016/j.crad.2023.07.009] [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] [Received: 05/03/2023] [Revised: 07/06/2023] [Accepted: 07/12/2023] [Indexed: 08/14/2023]
Abstract
AIM To investigate the value of feature pyramid network (FPN)-based computer-aided detection (CAD) of brain metastases (BMs) before and after non-surgical treatment, and to evaluate its performance in monitoring treatment response of BM on contrast-enhanced (CE) magnetic resonance imaging (MRI). MATERIAL AND METHODS Eighty-five cancer patients newly diagnosed with BM who had undergone initial and follow-up three-dimensional (3D) CE MRI at Liaocheng People's Hospital were included retrospectively in this study. Manual detection (MD) was performed by reviewer 1. Computer-aided detection (CAD) was performed by reviewer 2 using uAI Discover-BMs software. The treatment response was assessed by the two reviewers for each patient separately. A paired chi-square test was used to compare the differences in the detection of BM between MD and CAD. Agreement between MD and CAD in monitoring treatment response was assessed by kappa test. RESULTS The sensitivities of MD and CAD on initial 3D CE MRI were 78.65% and 99.13%, respectively. The sensitivities of MD and CAD on follow-up 3D CE MRI were 76.32% and 98.24%, respectively. There was a very good agreement between Reviewer 1 and Reviewer 2 in evaluating the treatment response of BM. CONCLUSION FPN-based CAD has a higher sensitivity of close to 100% and lower false negatives (FNs) for BM detection, compared to MD. Although CAD had a few shortcomings in reflecting changes of BMs after treatment, it had high performance in monitoring treatment response of BM on CE MRI.
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Affiliation(s)
- J Chen
- Department of MR, Liaocheng People's Hospital, Liaocheng, Shandong Province, 252000, China.
| | - L Meng
- Department of Radiotherapy, Liaocheng People's Hospital, Liaocheng, Shandong Province, 252000, China
| | - C Bu
- Department of MR, Liaocheng People's Hospital, Liaocheng, Shandong Province, 252000, China
| | - C Zhang
- Department of MR, Liaocheng People's Hospital, Liaocheng, Shandong Province, 252000, China
| | - P Wu
- Philips Healthcare, Shanghai, 200072, China
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Xie S, Bu C, LaCava J, Chi L. MsPHep: An online application for low molecular weight heparin rapid characterization based on liquid chromatography-tandem mass spectrometry. J Chromatogr A 2023; 1705:464179. [PMID: 37419018 DOI: 10.1016/j.chroma.2023.464179] [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: 05/21/2023] [Revised: 06/16/2023] [Accepted: 06/24/2023] [Indexed: 07/09/2023]
Abstract
Low-molecular-weight heparins (LMWHs) are important anticoagulants widely used in clinic. Since they are comprised of complex and heterogenous glycan chains, liquid chromatography-tandem mass spectrometry (LC-MS) is commonly used for structural analysis and quality control of LMWHs to ensure their safety and efficacy. Yet, the structural complexity arising from the parent heparin macromolecules, as well as the different depolymerization methods used for preparing LMWHs, makes processing and assigning the LC-MS data of LWMHs very tedious and challenging. We therefore developed, and here report, an open-source and easy-to-use web application, MsPHep, to facilitate the LMWH analysis based on LC-MS data. MsPHep is compatible with various LMWHs and chromatographic separation methods. With the HepQual function, MsPHep is capable of annotating both the LMWH compound and its isotopic distribution from mass spectra. Moreover, the HepQuant function enables automatic quantification of LMWH compositions without prior knowledge or any database generation. To demonstrate the reliability and system stability of MsPHep, we tested various types of LMWHs that were analyzed with different chromatographic methods coupled to MS. The results show that MsPHep has its own advantages compared to another public tool GlycReSoft for LMWH analysis, and it is available online under an open-source license at https://ngrc-glycan.shinyapps.io/MsPHep.
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Affiliation(s)
- Shaoshuai Xie
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong 266237, China; European Research Institute for the Biology of Ageing, University Medical Centre Groningen, Groningen 9700AD, Netherlands
| | - Changkai Bu
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong 266237, China
| | - John LaCava
- European Research Institute for the Biology of Ageing, University Medical Centre Groningen, Groningen 9700AD, Netherlands; Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY 10065, USA
| | - Lianli Chi
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong 266237, China.
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Shi D, Sheng A, Bu C, An Z, Cui X, Sun X, Li H, Zhang F, Linhardt RJ, Zhang T, Jin L, Chi L. A Cluster Sequencing Strategy To Determine the Consensus Affinity Domains in Heparin for Its Binding to Specific Proteins. Anal Chem 2022; 94:13987-13994. [PMID: 36183273 DOI: 10.1021/acs.analchem.2c03267] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Glycosaminoglycans (GAGs) have high negative charge and are biologically and pharmaceutically important because their high charge promotes a strong interaction with many proteins. Due to the inherent heterogeneity of GAGs, multiple oligosaccharides, containing certain common domains, often can interact with clusters of basic amino acid residues on a target protein. The specificity of many GAG-protein interactions remains undiscovered since there is insufficient structural information on the interacting GAGs. Herein, we establish a cluster sequencing strategy to simultaneously deduce all major sequences of the affinity GAG oligosaccharides, leading to a definition of the consensus sequence they share that corresponds to the specific binding domain for the target protein. As a proof of concept, antithrombin III-binding oligosaccharides were examined, resulting in a heptasaccharide domain containing the well-established anticoagulant pentasaccharide sequence. Repeating this approach, a new pentasaccharide domain was discovered corresponding to the heparin motif responsible for binding interferon-γ (IFNγ). Our strategy is fundamentally important for the discovery of saccharide sequences needed in the development of novel GAG-based therapeutics.
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Affiliation(s)
- Deling Shi
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China.,Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Anran Sheng
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China.,Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, Shandong Province 271018, China
| | - Changkai Bu
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China
| | - Zizhe An
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China
| | - Xueying Cui
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China
| | - Xiaojun Sun
- Collaborative Innovation Center for Green Chemical Manufacturing and Accurate Detection, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, Shandong Province 250022, China
| | - Hongmei Li
- Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market Regulation, Division of Metrology in Chemistry, National Institute of Metrology, Beijing 100029, China
| | - Fuming Zhang
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Robert J Linhardt
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Tianji Zhang
- Key Laboratory of Chemical Metrology and Applications on Nutrition and Health for State Market Regulation, Division of Metrology in Chemistry, National Institute of Metrology, Beijing 100029, China
| | - Lan Jin
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China
| | - Lianli Chi
- National Glycoengineering Research Center, Shandong University, Qingdao, Shandong Province 266237, China
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Chen Q, Li F, Wang H, Bu C, Shi F, Jin L, Zhang Q, Chi L. Evaluating the immunogenicity of heparin and heparin derivatives by measuring their binding to platelet factor 4 using biolayer interferometry. Front Mol Biosci 2022; 9:966754. [PMID: 36090049 PMCID: PMC9458964 DOI: 10.3389/fmolb.2022.966754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Accepted: 07/21/2022] [Indexed: 11/13/2022] Open
Abstract
Heparin (HP) is a polysaccharide that is widely used in the clinic as an anticoagulant. A major side effect associated with HP is the heparin-induced thrombocytopenia (HIT), which is initiated by the immune response to complex formed by HP and platelet factor 4 (PF4). Low molecular weight heparins (LMWHs) are the depolymerized version of HP, which have reduced risks of inducing HIT. However, it is still necessary to evaluate the immunogenicity of LMWHs to ensure their drug safety. Since HIT involves very complicated processes, the evaluation of HP and LMWH immunogenicity requires experiments from multiple aspects, of which the binding affinity between HP and PF4 is a key property to be monitored. Herein, we developed a novel competitive biolayer interferometry (BLI) method to investigate the binding affinity between HP and PF4. The influence of different domains in HP on its immunogenicity was compared for better understanding of the molecular mechanism of HP immunogenicity. Furthermore, the half maximal inhibitory concentration (IC50) of HP and LMWH can be measured by competitive combination, which is important for the quality control during the developing and manufacturing of HP and LMWH drugs.
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Affiliation(s)
- Qingqing Chen
- National Glycoengineering Research Center, Shandong University, Qingdao, China
| | - Fei Li
- National Glycoengineering Research Center, Shandong University, Qingdao, China
| | - Haoran Wang
- National Glycoengineering Research Center, Shandong University, Qingdao, China
| | - Changkai Bu
- National Glycoengineering Research Center, Shandong University, Qingdao, China
| | - Feng Shi
- Scientific Research Division, Shandong Institute for Food and Drug Control, Jinan, China
| | - Lan Jin
- National Glycoengineering Research Center, Shandong University, Qingdao, China
- *Correspondence: Lan Jin, ; Qunye Zhang, ; Lianli Chi,
| | - Qunye Zhang
- The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education, Chinese National Health Commission and Chinese Academy of Medical Sciences, Qilu Hospital, Shandong University, Jinan, China
- *Correspondence: Lan Jin, ; Qunye Zhang, ; Lianli Chi,
| | - Lianli Chi
- National Glycoengineering Research Center, Shandong University, Qingdao, China
- *Correspondence: Lan Jin, ; Qunye Zhang, ; Lianli Chi,
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Christoph JM, Minesinger GM, Bu C, Dukes CA, Elkins‐Tanton LT. Space Weathering Effects in Troilite by Simulated Solar-Wind Hydrogen and Helium Ion Irradiation. J Geophys Res Planets 2022; 127:e2021JE006916. [PMID: 35865507 PMCID: PMC9287097 DOI: 10.1029/2021je006916] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 01/07/2022] [Accepted: 01/10/2022] [Indexed: 06/15/2023]
Abstract
Space weathering is a key process in the interpretation of airless planetary surfaces. As we engage new missions to planetary objects with potentially novel surfaces such as 16 Psyche, there is renewed interest in expanding our knowledge of space weathering effects to a wider variety of analog materials, including the physical/chemical effects of solar-wind ions on planetary regoliths. We have experimentally simulated the effects of solar ions on two polished thick sections of meteoritic troilite (FeS) via irradiation with 1 keV hydrogen (H+) and 4 keV helium (He+), to investigate effects resulting from different ion species. We detected depletion of sulfur over the course of each irradiation using in situ X-ray photoelectron spectroscopy. Sulfur depletion rates were surprisingly similar for H+ and He+, interpreted as a function of subsurface ion-activated diffusion. By comparing XPS-derived elemental abundances with SDTrimSP computer simulations, we further quantified sulfur diffusion, sputtering yield, and altered-layer composition with respect to incident-ion fluence, and accounted for the influence of surface oxidation due to atmospheric sample storage. Using scanning electron microscopy, we detected an increase in nanoscale surface roughness resulting from the irradiation, which we quantified using atomic force microscopy. Based on these results, we estimate that an exposure time of order 103 Earth-years is required for troilite on Psyche to reach equilibrium sulfur depletion within the first atomic layer.
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Affiliation(s)
- J. M. Christoph
- School of Earth and Space ExplorationArizona State UniversityTempeAZUSA
| | - G. M. Minesinger
- Laboratory of Astrophysics and Surface PhysicsUniversity of VirginiaCharlottesvilleVAUSA
| | - C. Bu
- Laboratory of Astrophysics and Surface PhysicsUniversity of VirginiaCharlottesvilleVAUSA
- Columbia Astrophysics LaboratoryColumbia UniversityNew YorkNYUSA
| | - C. A. Dukes
- Laboratory of Astrophysics and Surface PhysicsUniversity of VirginiaCharlottesvilleVAUSA
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11
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Bu C, Jin L. NMR Characterization of the Interactions Between Glycosaminoglycans and Proteins. Front Mol Biosci 2021; 8:646808. [PMID: 33796549 PMCID: PMC8007983 DOI: 10.3389/fmolb.2021.646808] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Accepted: 02/24/2021] [Indexed: 12/16/2022] Open
Abstract
Glycosaminoglycans (GAGs) constitute a considerable fraction of the glycoconjugates found on cellular membranes and in the extracellular matrix of virtually all mammalian tissues. The essential role of GAG-protein interactions in the regulation of physiological processes has been recognized for decades. However, the underlying molecular basis of these interactions has only emerged since 1990s. The binding specificity of GAGs is encoded in their primary structures, but ultimately depends on how their functional groups are presented to a protein in the three-dimensional space. This review focuses on the application of NMR spectroscopy on the characterization of the GAG-protein interactions. Examples of interpretation of the complex mechanism and characterization of structural motifs involved in the GAG-protein interactions are given. Selected families of GAG-binding proteins investigated using NMR are also described.
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Affiliation(s)
- Changkai Bu
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao, China
| | - Lan Jin
- National Glycoengineering Research Center, Shandong Key Laboratory of Carbohydrate Chemistry and Glycobiology, Shandong University, Qingdao, China
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Peng S, Liang Y, Jing X, Chen Y, Lin D, Bu C, Zheng D, Huang K, Lei M, Xiao S, Yang L, Liu J, Huang S, Tao E. The MRI-based brain structure measurements in Parkinson’s disease and Parkinson-plus syndromes. Parkinsonism Relat Disord 2018. [DOI: 10.1016/j.parkreldis.2017.11.320] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Guo ZY, Zhang JX, Wu M, Mei YF, Lin XJ, Bu C, Xie Y, Wang J. Meta-analysis of the association between PADI4 -92C/G polymorphism and rheumatoid arthritis in the Chinese population. Braz J Med Biol Res 2017; 50:e6115. [PMID: 28832760 PMCID: PMC5561805 DOI: 10.1590/1414-431x20176115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 06/14/2017] [Indexed: 11/22/2022] Open
Abstract
Many studies have evaluated the correlation between peptidylarginine deiminase 4 (PADI4) -92C/G polymorphism and rheumatoid arthritis (RA), but the results remain inconclusive. Therefore, we performed a meta-analysis in the Chinese population to provide comprehensive data on the association between PADI4 -92C/G polymorphism and RA. Eligible studies published before May 2016 were identified in PubMed and Chinese databases. The strengths of these associations were assessed by pooled odds ratios (OR) and 95% confidence interval (CI). Eight studies documenting a total of 1351 RA cases and 1585 controls were included in this meta-analysis. In the overall analysis, a significant association between the PADI4 -92C/G polymorphism and RA was found in the Chinese population (G vs C: OR=1.32, 95%CI=1.02-1.71; GG+CG vs CC: OR=1.75, 95%CI=1.20-2.53). The subgroup analyses stratified by geographic area(s) and source of controls revealed significant results in South China, in hospital-based studies and population-based studies. In summary, this meta-analysis suggested that PADI4 -92C/G polymorphism may be associated with the RA incidence in the Chinese population, especially for South China. Further studies conducted on other ethnic groups are required for definite conclusions.
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Affiliation(s)
- Z Y Guo
- Department of Orthopedic Surgery, The First Affiliated Hospital of Zhejiang University, Hangzhou, China.,Department of Orthopedic Surgery, Sanmen People Hospital, Sanmen, China
| | - J X Zhang
- Department of Orthopedic Surgery, Qingtian People Hospital (The Affiliated Hospital of Lishui Academy), Qingtian, China
| | - M Wu
- Department of Combine of Western Medicine and Traditional Chinese Medicine, Sanmen People Hospital, Sanmen, China
| | - Y F Mei
- Department of Orthopedic Surgery, Sanmen People Hospital, Sanmen, China
| | - X J Lin
- Department of Orthopedic Surgery, The First Affiliated Hospital of Zhejiang University, Hangzhou, China
| | - C Bu
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - Y Xie
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
| | - J Wang
- Institute of Virology and Biotechnology, Zhejiang Academy of Agricultural Sciences, Hangzhou, China
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14
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Abstract
Reduced fibrinolytic activity has been described in primary anti-phospholipid syndrome (PAPS), and may be responsible for thrombotic events. Antibodies to tissue type plasminogen activator (t-PA) or plasminogen (PLG) might contribute to the hypofibrinolytic state in autoimmune diseases, but the clinical significance of these antibodies is still unclear in recurrent pregnancy loss (RPL). The aim of this study is to evaluate the prevalence and clinical significance of anti-PLG and anti-t-PA antibodies in 87 patients with a history of RPL: 54 women with well-defined PAPS (mean age 32.5 years; range 26-38) and 33 women with unexplained RPL (mean age 30 years; range 24-39). IgG anti-PLG antibodies were found in 20 and four patients from the group with RPL/PAPS and unexplained RPL, respectively; IgG anti-t-PA antibodies were found in 11 and two patients from the above two groups, respectively. IgG anti-PLG antibodies were associated with the high risk of RPL (OR 7.2, P = 0.004), especially with RPL/PAPS (OR 11.2, P < 0.001) evaluated by Fisher's exact test, while IgG anti-t-PA were associated with RPL/PAPS (OR 10.0, P = 0.01) but not with RPL (OR 6.8, P = 0.06). A significant inhibition of exogenous fibrinolysis was observed by IgG fractions from patients with anti-PLG or anti-t-PA antibodies on microplates and on the human umbilical vein endothelial cells, compared with those from healthy controls. The prevalence of IgG anti-PLG antibodies was high in RPL patients, especially in RPL/PAPS, while the prevalence of IgG anti-t-PA antibodies was high in RPL/PAPS but not in RPL, and some of them might inhibit fibrinolysis in patients.
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Affiliation(s)
- C Bu
- Life Science Division, Graduate School at Shenzhen, Tsinghua University, Shenzhen, China
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Jin Z, Liao A, Bu C. [Clinical applications of island and myocutaneous flaps]. Zhonghua Zheng Xing Shao Shang Wai Ke Za Zhi 1998; 14:6-8. [PMID: 10452022] [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: 02/13/2023]
Abstract
OBJECTIVE This is to introduce the experience in clinical applications of the island and myocutaneous flaps. METHODS Since 1985 fifteen types of vascularized island and myocutaneous flaps have been applied in 52 cases (21 positions) for the following purposes: repairing traumatic soft tissue defects on the limb, scar contracture, congenital recto-vaginal fistula, reconstructing congenital nasal deformity and rehabilitating function. The non-major artery island flap was used in 47 cases (90.38%) and the retrograde island flap was used in 24 cases (46.15%). The size of the flap ranged from 2.5 cm x 1.5 cm to 15 cm x 12 cm. RESULTS All the flaps survived with primary healing. Follow-up for 8 months to 11 years showed aesthetically and functionally satisfactory results in all cases. CONCLUSION These island and myocutaneous flaps have rich blood supply and are highly anti-infective. The operation is easy and the success rate is high.
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Affiliation(s)
- Z Jin
- Department of Plastic Surgery, Huangshi 3rd Hospital
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Bu C, Renz U. 97. Zur NOx- und N2O-Reduktion bei der Kohleverbrennung in Wirbelschichtanlagen. CHEM-ING-TECH 1993. [DOI: 10.1002/cite.330650999] [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: 11/07/2022]
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