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Fu HW, Lai YC. The Role of Helicobacter pylori Neutrophil-Activating Protein in the Pathogenesis of H. pylori and Beyond: From a Virulence Factor to Therapeutic Targets and Therapeutic Agents. Int J Mol Sci 2022; 24:ijms24010091. [PMID: 36613542 PMCID: PMC9820732 DOI: 10.3390/ijms24010091] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/12/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
Abstract
Helicobacter pylori neutrophil-activating protein (HP-NAP), a major virulence factor of H. pylori, plays a role in bacterial protection and host inflammation. HP-NAP activates a variety of innate immune cells, including neutrophils, monocytes, and mast cells, to induce their pro-oxidant and pro-inflammatory activities. This protein also induces T-helper type 1 (Th1) immune response and cytotoxic T lymphocyte (CTL) activity, supporting that HP-NAP is able to promote gastric inflammation by activation of adaptive immune responses. Thus, HP-NAP is a potential therapeutic target for the treatment of H. pylori-induced gastric inflammation. The inflammatory responses triggered by HP-NAP are mediated by a PTX-sensitive G protein-coupled receptor and Toll-like receptor 2. Drugs designed to block the interactions between HP-NAP and its receptors could alleviate the inflammation in gastric mucosa caused by H. pylori infection. In addition, HP-NAP acts as a promising therapeutic agent for vaccine development, allergy treatment, and cancer immunotherapy. The high antigenicity of HP-NAP makes this protein a component of vaccines against H. pylori infection. Due to its immunomodulatory activity to stimulate the Th1-inducing ability of dendritic cells, enhance Th1 immune response and CTL activity, and suppress Th2-mediated allergic responses, HP-NAP could also act as an adjuvant in vaccines, a drug candidate against allergic diseases, and an immunotherapeutic agent for cancer. This review highlights the role of HP-NAP in the pathogenesis of H. pylori and the potential for this protein to be a therapeutic target in the treatment of H. pylori infection and therapeutic agents against H. pylori-associated diseases, allergies, and cancer.
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Affiliation(s)
- Hua-Wen Fu
- Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsinchu 30013, Taiwan
- Department of Life Science, National Tsing Hua University, Hsinchu 30013, Taiwan
- Correspondence: ; Tel.: +886-3-574-2485
| | - Yu-Chang Lai
- Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsinchu 30013, Taiwan
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Zhang K, Mirza WA, Ni P, Yu M, Wang C, Wang B, Chang S, Yue L, Zhang R, Duan G. Recombination Lactococcus lactis expressing Helicobacter pylori neutrophil-activating protein A attenuates food allergy symptoms in mice. FEMS Microbiol Lett 2021; 368:6179882. [PMID: 33749737 DOI: 10.1093/femsle/fnab034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2020] [Accepted: 03/18/2021] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Food allergy has been a significant public health issue with growing severity, prevalence and limited treatments. The neutrophil-activating protein A subunit (NapA) of Helicobacter pylori has been shown to have therapeutic potential in allergic diseases. METHODS The NapA expression efficiency of recombinant Lactococcus lactis(L.lactis) were determined. The effects of recombinant bacterium on food allergy in Balb/c mice were also investigated. RESULTS NapA were delivered and expressed efficiently via L. lactis. The engineered bacterium ameliorated food allergy symptoms (acute diarrhea and intestinal inflammation) and decreased serum histamine levels. In addition, the secretion of OVA-specific IgG2a, IFN-γ was promoted and the level of IL-4, OVA-specific IgE was restrained. CONCLUSIONS The recombinant strain may attenuate food allergy in mice through immune regulatory effect, which may be a promising approach for preventing or treating food allergy.
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Affiliation(s)
- Ke Zhang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Wajid Ameen Mirza
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Peng Ni
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Mingyang Yu
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Chen Wang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Bin Wang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Shuailei Chang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Limin Yue
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
| | - Rongguang Zhang
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China.,Department of Epidemiology, College of Public Health, Hainan Medical University, Haikou 571199, China
| | - Guangcai Duan
- Department of Epidemiology, College of Public Health, Zhengzhou University, No. 100 Kexue Dadao, Zhengzhou 450001, China
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Zuo ZT, Ma Y, Sun Y, Bai CQ, Ling CH, Yuan FL. The Protective Effects of Helicobacter pylori Infection on Allergic Asthma. Int Arch Allergy Immunol 2020; 182:53-64. [PMID: 33080611 DOI: 10.1159/000508330] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2020] [Accepted: 04/30/2020] [Indexed: 12/13/2022] Open
Abstract
As an ancient Gram-negative bacterium, Helicobacter pylori has settled in human stomach. Eradicating H. pylori increases the morbidities of asthma and other allergic diseases. Therefore, H. pylori might play a protective role against asthma. The "disappearing microbiota" hypothesis suggests that the absence of certain types of the ancestral microbiota could change the development of immunology, metabolism, and cognitive ability in our early life, contributing to the development of some diseases. And the Hygiene Hypothesis links early environmental and microbial exposure to the prevalence of atopic allergies and asthma. Exposure to the environment and microbes can influence the growing immune system and protect subsequent immune-mediated diseases. H. pylori can inhibit allergic asthma by regulating the ratio of helper T cells 1/2 (Th1/Th2), Th17/regulatory T cells (Tregs), etc. H. pylori can also target dendritic cells to promote immune tolerance and enhance the protective effect on allergic asthma, and this effect relies on highly suppressed Tregs. The remote regulation of lung immune function by H. pylori is consistent with the gut-lung axis theory. Perhaps, H. pylori also protects against asthma by altering levels of stomach hormones, affecting the autonomic nervous system and lowering the expression of heat shock protein 70. Therapeutic products from H. pylori may be used to prevent and treat asthma. This paper reviews the possible protective influence of H. pylori on allergic asthma and the possible application of H. pylori in treating asthma.
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Affiliation(s)
- Zhi Tong Zuo
- Department of Respiratory Disease, The Hospital Affiliated to Jiangnan University, Wuxi, China,
| | - Ya Ma
- Wuxi Medical College of Jiangnan University, Wuxi, China
| | - Yan Sun
- Department of Respiratory Disease, The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Cui Qing Bai
- Department of Respiratory Disease, The Hospital Affiliated to Jiangnan University, Wuxi, China
| | - Chun Hua Ling
- Department of Respiratory Disease, First Affiliated Hospital of Soochow University, Suzhou, China
| | - Feng Lai Yuan
- Department of Orthopaedics and Central Laboratory, The Hospital Affiliated to Jiangnan University, Wuxi, China
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Mai J, Liang B, Xiong Z, Ai X, Gao F, Long Y, Yao S, Liu Y, Gong S, Zhou Z. Oral administration of recombinant
Bacillus subtilis
spores expressing
Helicobacter pylori
neutrophil‐activating protein suppresses peanut allergy via up‐regulation of Tregs. Clin Exp Allergy 2019; 49:1605-1614. [DOI: 10.1111/cea.13489] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 08/18/2019] [Accepted: 08/26/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Jialiang Mai
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Bingshao Liang
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Zhile Xiong
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Xiaolan Ai
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Fei Gao
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Yan Long
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Shuwen Yao
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Yunfeng Liu
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Sitang Gong
- Pediatric Gastroenterology Department Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
| | - Zhenwen Zhou
- Clinical Laboratory Guangzhou Women and Children's Medical Center Guangzhou Medical University Guangzhou China
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Peng X, Zhang R, Wang C, Yu F, Yu M, Chen S, Fan Q, Xi Y, Duan G. E. coli Enterotoxin LtB Enhances Vaccine-Induced Anti- H. pylori Protection by Promoting Leukocyte Migration into Gastric Mucus via Inflammatory Lesions. Cells 2019; 8:E982. [PMID: 31461854 PMCID: PMC6770474 DOI: 10.3390/cells8090982] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2019] [Revised: 08/23/2019] [Accepted: 08/23/2019] [Indexed: 12/11/2022] Open
Abstract
Current studies indicate that the anti-H. pylori protective efficacy of oral vaccines to a large extent depends on using mucosal adjuvants like E. coli heat-lable enterotoxin B unit (LtB). However, the mechanism by which Th17/Th1-driven cellular immunity kills H. pylori and the role of LtB remains unclear. Here, two L.lactis strains, expressing H. pylori NapA and LtB, respectively, were orally administrated to mice. As observed, the administration of LtB significantly enhanced the fecal SIgA level and decreased gastric H. pylori colonization, but also markedly aggravated gastric inflammatory injury. Both NapA group and NapA+LtB group had elevated splenocyte production of IL-8, IL-10, IL-12, IL-17, IL-23 and INF-γ. Notably, gastric leukocytes' migration or leakage into the mucus was observed more frequently in NapA+LtB group than in NapA group. This report is the first that discusses how LtB enhances vaccine-induced anti-H. pylori efficacy by aggravating gastric injury and leukocytes' movement into the mucus layer. Significantly, it brings up a novel explanation for the mechanism underlying mucosal cellular immunity destroying the non-invasive pathogens. More importantly, the findings suggest the necessity to further evaluate LtB's potential hazards to humans before extending its applications. Thus, this report can provide considerable impact on the fields of mucosal immunology and vaccinology.
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Affiliation(s)
- Xiaoyan Peng
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
- Department of Basic Medicine, Chuxiong Medical College, Chuxiong 675005, China
| | - Rongguang Zhang
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China.
| | - Chen Wang
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Feiyan Yu
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Mingyang Yu
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Shuaiyin Chen
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Qingtang Fan
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Yuanlin Xi
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
| | - Guangcai Duan
- Department of Epidemiology and Statistics, College of Public Health, Zhengzhou University, Zhengzhou 450001, China
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Production and delivery of Helicobacter pylori NapA in Lactococcus lactis and its protective efficacy and immune modulatory activity. Sci Rep 2018; 8:6435. [PMID: 29691472 PMCID: PMC5915382 DOI: 10.1038/s41598-018-24879-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Accepted: 04/10/2018] [Indexed: 12/16/2022] Open
Abstract
Helicobacter pylori neutrophil-activating protein A subunit (NapA) has been identified as a virulence factor, a protective antigen and a potent immunomodulator. NapA shows unique application potentials for anti-H. pylori vaccines and treatment strategies of certain allergic diseases and carcinomas. However, appropriate production and utilization modes of NapA still remain uncertain to date. This work has established a novel efficient production and utilization mode of NapA by using L. lactis as an expression host and delivery vector, and demonstrated immune protective efficacy and immune modulatory activity of the engineered L. lactis by oral vaccination of mice. It was observed for the first time that H. pylori NapA promotes both polarized Th17 and Th1 responses, which may greatly affect the clinical application of NapA. This report offers a promising anti-H. pylori oral vaccine candidate and a potent mucosal immune modulatory agent. Meanwhile, it uncovers a way to produce and deliver the oral vaccine and immunomodulator by fermentation of food like milk, which might have striking effects on control of H. pylori infection, gastrointestinal cancers, and Th2 bias allergic diseases, including many food allergies.
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A Recombinant DNA Plasmid Encoding the sIL-4R-NAP Fusion Protein Suppress Airway Inflammation in an OVA-Induced Mouse Model of Asthma. Inflammation 2017; 39:1434-40. [PMID: 27209195 DOI: 10.1007/s10753-016-0375-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Asthma is a chronic inflammatory airway disease. It was prevalently perceived that Th2 cells played the crucial role in asthma pathogenesis, which has been identified as the important target for anti-asthma therapy. The soluble IL-4 receptor (sIL-4R), which is the decoy receptor for Th2 cytokine IL-4, has been reported to be effective in treating asthma in phase I/II clinical trail. To develop more efficacious anti-asthma agent, we attempt to test whether the Helicobacter pylori neutrophil-activating protein (HP-NAP), a novel TLR2 agonist, would enhance the efficacy of sIL-4R in anti-asthma therapy. In our work, we constructed a pcDNA3.1-sIL-4R-NAP plasmid, named PSN, encoding fusion protein of murine sIL-4R and HP-NAP. PSN significantly inhibited airway inflammation, decreased the serum OVA-specific IgE levels and remodeled the Th1/Th2 balance. Notably, PSN is more effective on anti-asthma therapy comparing with plasmid only expressing sIL-4R.
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8
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Zawilak-Pawlik A, Zakrzewska-Czerwińska J. Recent Advances in Helicobacter pylori Replication: Possible Implications in Adaptation to a Pathogenic Lifestyle and Perspectives for Drug Design. Curr Top Microbiol Immunol 2017; 400:73-103. [PMID: 28124150 DOI: 10.1007/978-3-319-50520-6_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
DNA replication is an important step in the life cycle of every cell that ensures the continuous flow of genetic information from one generation to the next. In all organisms, chromosome replication must be coordinated with overall cell growth. Helicobacter pylori growth strongly depends on its interaction with the host, particularly with the gastric epithelium. Moreover, H. pylori actively searches for an optimal microniche within a stomach, and it has been shown that not every microniche equally supports growth of this bacterium. We postulate that besides nutrients, H. pylori senses different, unknown signals, which presumably also affect chromosome replication to maintain H. pylori propagation at optimal ratio allowing H. pylori to establish a chronic, lifelong infection. Thus, H. pylori chromosome replication and particularly the regulation of this process might be considered important for bacterial pathogenesis. Here, we summarize our current knowledge of chromosome and plasmid replication in H. pylori and discuss the mechanisms responsible for regulating this key cellular process. The results of extensive studies conducted thus far allow us to propose common and unique traits in H. pylori chromosome replication. Interestingly, the repertoire of proteins involved in replication in H. pylori is significantly different to that in E. coli, strongly suggesting that novel factors are engaged in H. pylori chromosome replication and could represent attractive drug targets.
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Affiliation(s)
- Anna Zawilak-Pawlik
- Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Ul. Weigla 12, 53-114, Wrocław, Poland.
| | - Jolanta Zakrzewska-Czerwińska
- Department of Microbiology, Hirszfeld Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Ul. Weigla 12, 53-114, Wrocław, Poland
- Department of Molecular Microbiology, Faculty of Biotechnology, University of Wrocław, Ul. Joliot-Curie 14A, 50-383, Wrocław, Poland
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9
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Sinha S, Goyal S, Somvanshi P, Grover A. Mechanistic Insights into the Binding of Class IIa HDAC Inhibitors toward Spinocerebellar Ataxia Type-2: A 3D-QSAR and Pharmacophore Modeling Approach. Front Neurosci 2017; 10:606. [PMID: 28119557 PMCID: PMC5223442 DOI: 10.3389/fnins.2016.00606] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 12/20/2016] [Indexed: 12/18/2022] Open
Abstract
Spinocerebellar ataxia (SCA-2) type-2 is a rare neurological disorder among the nine polyglutamine disorders, mainly caused by polyQ (CAG) trinucleotide repeats expansion within gene coding ataxin-2 protein. The expanded trinucleotide repeats within the ataxin-2 protein sequesters transcriptional cofactors i.e., CREB-binding protein (CBP), Ataxin-2 binding protein 1 (A2BP1) leading to a state of hypo-acetylation and transcriptional repression. Histone de-acetylases inhibitors (HDACi) have been reported to restore transcriptional balance through inhibition of class IIa HDAC's, that leads to an increased acetylation and transcription as demonstrated through in-vivo studies on mouse models of Huntington's. In this study, 61 di-aryl cyclo-propanehydroxamic acid derivatives were used for developing three dimensional (3D) QSAR and pharmacophore models. These models were then employed for screening and selection of anti-ataxia compounds. The chosen QSAR model was observed to be statistically robust with correlation coefficient (r2) value of 0.6774, cross-validated correlation coefficient (q2) of 0.6157 and co-relation coefficient for external test set (pred_r2) of 0.7570. A high F-test value of 77.7093 signified the robustness of the model. Two potential drug leads ZINC 00608101 (SEI) and ZINC 00329110 (ACI) were selected after a coalesce procedure of pharmacophore based screening using the pharmacophore model ADDRR.20 and structural analysis using molecular docking and dynamics simulations. The pharmacophore and the 3D-QSAR model generated were further validated for their screening and prediction ability using the enrichment factor (EF), goodness of hit (GH), and receiver operating characteristics (ROC) curve analysis. The compounds SEI and ACI exhibited a docking score of −10.097 and −9.182 kcal/mol, respectively. An evaluation of binding conformation of ligand-bound protein complexes was performed with MD simulations for a time period of 30 ns along with free energy binding calculations using the g_mmpbsa technique. Prediction of inhibitory activities of the two lead compounds SEI (7.53) and ACI (6.84) using the 3D-QSAR model reaffirmed their inhibitory characteristics as potential anti-ataxia compounds.
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Affiliation(s)
- Siddharth Sinha
- Department of Biotechnology, TERI University New Delhi, India
| | - Sukriti Goyal
- Department of Bioscience and Biotechnology, Banasthali University Tonk, India
| | | | - Abhinav Grover
- School of Biotechnology, Jawaharlal Nehru University New Delhi, India
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Budden KF, Gellatly SL, Wood DLA, Cooper MA, Morrison M, Hugenholtz P, Hansbro PM. Emerging pathogenic links between microbiota and the gut-lung axis. Nat Rev Microbiol 2016; 15:55-63. [PMID: 27694885 DOI: 10.1038/nrmicro.2016.142] [Citation(s) in RCA: 836] [Impact Index Per Article: 104.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The microbiota is vital for the development of the immune system and homeostasis. Changes in microbial composition and function, termed dysbiosis, in the respiratory tract and the gut have recently been linked to alterations in immune responses and to disease development in the lungs. In this Opinion article, we review the microbial species that are usually found in healthy gastrointestinal and respiratory tracts, their dysbiosis in disease and interactions with the gut-lung axis. Although the gut-lung axis is only beginning to be understood, emerging evidence indicates that there is potential for manipulation of the gut microbiota in the treatment of lung diseases.
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Affiliation(s)
- Kurtis F Budden
- Priority Research Centre for Healthy Lungs, University of Newcastle and Hunter Medical Research Institute, Newcastle, New South Wales 2305, Australia
| | - Shaan L Gellatly
- Priority Research Centre for Healthy Lungs, University of Newcastle and Hunter Medical Research Institute, Newcastle, New South Wales 2305, Australia
| | - David L A Wood
- Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Matthew A Cooper
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Mark Morrison
- The University of Queensland Diamantina Institute, Translational Research Institute, Brisbane, Queensland 4072, Australia
| | - Philip Hugenholtz
- Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, and the Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland 4072, Australia; and The University of Queensland Diamantina Institute, Translational Research Institute, Woolloongabba, Queensland 4102, Australia
| | - Philip M Hansbro
- Priority Research Centre for Healthy Lungs, University of Newcastle and Hunter Medical Research Institute, Newcastle, New South Wales 2305, Australia
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Sinha S, Tyagi C, Goyal S, Jamal S, Somvanshi P, Grover A. Fragment based G-QSAR and molecular dynamics based mechanistic simulations into hydroxamic-based HDAC inhibitors against spinocerebellar ataxia. J Biomol Struct Dyn 2016; 34:2281-95. [PMID: 26510381 DOI: 10.1080/07391102.2015.1113386] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Expansion of polyglutamine (CAG) triplets within the coding gene ataxin 2 results in transcriptional repression, forming the molecular basis of the neurodegenerative disorder named spinocerebellar ataxia type-2 (SCA2). HDAC inhibitors (HDACi) have been elements of great interest in polyglutamine disorders such as Huntington's and Ataxia's. In this study, we have selected hydroxamic acid derivatives as HDACi and performed fragment-based G-QSAR, molecular docking studies and molecular dynamics simulations for elucidating the dynamic mode of action of HDACi with His-Asp catalytic dyad of HDAC4. The model was statistically validated to establish its predictive robustness. The model was statistically significant with r(2) value of .6297, cross-validated co-relation coefficient q(2) value of .5905 and pred_r(2) (predicted square co-relation coefficient) value of .85. An F-test value of 56.11 confirms absolute robustness of the model. Two combinatorial libraries comprising of 3180 compounds were created with hydroxamate moiety as the template and their pIC50 activities were predicted based on the G-QSAR model. The combinatorial library created was screened on the basis of predicted activity (pIC50), with two resultant top scoring compounds, HIC and DHC. The interaction of the compounds with His-Asp dyad in terms of H-bond interactions with His802, Asp840, Pro942, and Gly975 residues of HDAC4 was evaluated by docking and 20 ns long molecular dynamics simulations. This study provides valuable leads for structural substitutions required for hydroxamate moiety to exhibit enhanced inhibitory activity against HDAC4. The reported compounds demonstrated good binding and thus can be considered as potent therapeutic leads against ataxia.
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Affiliation(s)
- Siddharth Sinha
- a Department of Biotechnology , TERI University , 10 Institutional Area, Vasant Kunj, New Delhi 110070 , India
| | - Chetna Tyagi
- b Indian Agricultural Research Institute , PUSA Road, New Delhi 110012 , India
| | - Sukriti Goyal
- c Department of Bioscience and Biotechnology , Banasthali University , Tonk , Rajasthan 304022 , India
| | - Salma Jamal
- c Department of Bioscience and Biotechnology , Banasthali University , Tonk , Rajasthan 304022 , India
| | - Pallavi Somvanshi
- a Department of Biotechnology , TERI University , 10 Institutional Area, Vasant Kunj, New Delhi 110070 , India
| | - Abhinav Grover
- d School of Biotechnology , Jawaharlal Nehru University , New Delhi 110067 , India
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