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Keating T, Lethbridge S, Allnutt JC, Hendon-Dunn CL, Thomas SR, Alderwick LJ, Taylor SC, Bacon J. Mycobacterium tuberculosis modifies cell wall carbohydrates during biofilm growth with a concomitant reduction in complement activation. ACTA ACUST UNITED AC 2021; 7:100065. [PMID: 34778603 PMCID: PMC8577165 DOI: 10.1016/j.tcsw.2021.100065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 10/04/2021] [Indexed: 11/26/2022]
Abstract
The development of new vaccines for TB needs to be underpinned by an understanding of both the molecular and cellular mechanisms of host-pathogen interactions and how the immune response can be modulated to achieve protection from disease. Complement orchestrates many aspects of the innate and adaptive immune responses. However, little is known about the contribution of the complement pathways during TB disease, particularly with respect to mycobacterial phenotype. Extracellular communities (biofilms) of M. tuberculosis are found in the acellular rim of granulomas, during disease, and these are likely to be present in post-primary TB episodes, in necrotic lesions. Our study aimed to determine which mycobacterial cell wall components were altered during biofilm growth and how these cell wall alterations modified the complement response. We have shown that M. tuberculosis biofilms modified their cell wall carbohydrates and elicited reduced classical and lectin pathway activation. Consistent with this finding was the reduction of C3b/iC3b deposition on biofilm cell wall carbohydrate extracts. Here, we have highlighted the role of cell wall carbohydrate alterations during biofilm growth of M. tuberculosis and subsequent modulation of complement activation.
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Affiliation(s)
- Thomas Keating
- TB Discovery Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom.,School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Samuel Lethbridge
- TB Discovery Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
| | - Jon C Allnutt
- TB Discovery Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
| | - Charlotte L Hendon-Dunn
- TB Discovery Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
| | - Stephen R Thomas
- Pathogen Immunology Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
| | - Luke J Alderwick
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
| | - Stephen C Taylor
- Pathogen Immunology Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
| | - Joanna Bacon
- TB Discovery Group, National Infection Service, Public Health England, Porton Down, Salisbury SP4 0JG, United Kingdom
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Cytokine Profile in Early Infection by Leptospira interrogans in A/J Mice. J Immunol Res 2019; 2019:1892508. [PMID: 31687410 PMCID: PMC6800925 DOI: 10.1155/2019/1892508] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 04/07/2019] [Accepted: 06/22/2019] [Indexed: 12/28/2022] Open
Abstract
Leptospirosis is considered a neglected disease with an estimated more than one million cases every year. Since rodents are at the same time the main reservoir and generally asymptomatic to Leptospira infection, understanding why some animal species are resistant and others are susceptible to this infection would shed some light in how to control this important zoonosis. The innate immune response against Leptospira is mainly dependent on phagocytosis and activation of the Complement System. In this context, cytokines may drive the early control of infection and the adaptive response. Since the Complement System is important to eliminate leptospires in vivo, we investigated if Complement C5 in A/J mice would modulate the cytokine production during infection by Leptospira interrogans serovar Kennewicki type Pomona Fromm (LPF). Thus, our aim was to investigate the systemic levels of pro- and anti-inflammatory cytokines during Leptospira infection in the blood, liver, lung, and kidney on the third and sixth days of infection in A/J C5+/+ and A/J C5-/- mice. Blood levels of TNF-α, IL-6, IFN-γ, and MCP-1 reached a peak on the third day. Although both mouse strains developed splenomegaly, similar histopathological alterations in the liver and the lung, levels of pro- and anti-inflammatory cytokines were different. A/J C5+/+ mice had higher levels of liver IL-10, IL-1β, IL-12p40, and IL-12p70 and kidney IL-1β, IL-12p40, and IL-12p70 on the sixth day of infection when compared to A/J C5-/- mice. Our results showed that in A/J genetic background, the Complement component C5 modulates a cytokine profile in the liver and kidney of infected mice, which may play a role in the control of disease progression.
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Primary immunodeficiency diseases in a tuberculosis endemic region: challenges and opportunities. Genes Immun 2018; 20:447-454. [PMID: 30185814 DOI: 10.1038/s41435-018-0041-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 06/26/2018] [Accepted: 06/29/2018] [Indexed: 12/11/2022]
Abstract
While individual primary immunodeficiency diseases (PIDs) are rare, collectively they represent a significant burden of disease. Recent estimates show that about one million people in Africa suffer from a PID. However, data from African PID registries reflect only a small percentage of the estimated prevalence. This disparity is partly due to the lack of PID awareness and the masking of PIDs by the endemic pathogens. Over three million tuberculosis (TB) cases were reported in Africa in 2016, with many of these from southern Africa. Despite concerted efforts to address this high burden of disease, the underlying genetic correlates of susceptibility to TB remain poorly understood. High penetrance mutations in immune system genes can cause PIDs that selectively predispose individuals to TB and other mycobacterial diseases. Additionally, the identification of individuals at a heightened risk of developing TB or of presenting with severe or disseminated TB due to their genetic ancestry is crucial to promote a positive treatment outcome. The screening for and identification of PID mutations in TB-endemic regions by next-generation sequencing (NGS) represents a promising approach to improve the understanding of what constitutes an effective immune response to TB, as well as the range of associated PIDs and phenotypes.
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Jiang TT, Shi LY, Chen J, Wei LL, Li M, Hu YT, Gan L, Liu CM, Tu HH, Li ZB, Yi WJ, Li JC. Screening and identification of potential protein biomarkers for evaluating the efficacy of intensive therapy in pulmonary tuberculosis. Biochem Biophys Res Commun 2018; 503:2263-2270. [PMID: 29959917 DOI: 10.1016/j.bbrc.2018.06.147] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 06/26/2018] [Indexed: 11/16/2022]
Abstract
This research aimed to discover potential biomarkers for evaluating the therapeutic efficacy of intensive therapy in pulmonary tuberculosis (TB). Protein profiles in 2-months intensively treated TB patients, untreated TB patients, and healthy controls were investigated with iTRAQ-2DLC-MS/MS technique. 71 differential proteins were identified in 2-months intensively treated TB patients. Significant differences in complement component C7 (CO7), apolipoprotein A-IV (APOA4), apolipoprotein C-II (APOC2), and angiotensinogen (ANGT) were found by ELISA validation. CO7 and ANGT were also found significantly different in sputum negative patients, compared with sputum positive patients after intensive treatment. Clinical analysis showed that after 2-months intensive treatment several indicators were significantly changed, and the one-year cure rate of sputum negative patients were significantly higher than sputum positive patients. Diagnostic models consisting of APOC2, CO7 and APOA4 were established to distinguish intensively treated TB patients from untreated TB patients and healthy controls with the AUC value of 0.910 and 0.935. Meanwhile, ANGT and CO7 were combined to identify sputum negative and sputum positive TB patients after intensive treatment with 89.36% sensitivity, 71.43% specificity, and the AUC value of 0.853. The results showed that APOC2, CO7, APOA4, and ANGT may be potential biomarkers for evaluating the efficacy of intensive anti-TB therapy.
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Affiliation(s)
- Ting-Ting Jiang
- South China University of Technology School of Medicine, Guangzhou, 510006, China
| | - Li-Ying Shi
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou, 310013, China
| | - Jing Chen
- Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China
| | - Li-Liang Wei
- Department of Pneumology, Shaoxing Municipal Hospital, Shaoxing, 312000, China
| | - Meng Li
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou, 310013, China
| | - Yu-Ting Hu
- South China University of Technology School of Medicine, Guangzhou, 510006, China
| | - Lin Gan
- South China University of Technology School of Medicine, Guangzhou, 510006, China
| | - Chang-Ming Liu
- Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China
| | - Hui-Hui Tu
- Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China
| | - Zhi-Bin Li
- Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China
| | - Wen-Jing Yi
- Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China
| | - Ji-Cheng Li
- South China University of Technology School of Medicine, Guangzhou, 510006, China; Institute of Cell Biology, Zhejiang University, Hangzhou, 310058, China.
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Al-Rayahi IAM, Browning MJ, Stover C. Tumour cell conditioned medium reveals greater M2 skewing of macrophages in the absence of properdin. IMMUNITY INFLAMMATION AND DISEASE 2017; 5:68-77. [PMID: 28250926 PMCID: PMC5322164 DOI: 10.1002/iid3.142] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 09/14/2016] [Accepted: 10/28/2016] [Indexed: 11/29/2022]
Abstract
Introduction The tumour microenvironment is shaped by the interaction of immune, non immune, and tumour cells present in close proximity. Tumour cells direct the development of a locally immune suppressed state, affecting the activity of anti tumour T cells and preparing the escape phase of tumour development. Macrophages in the tumour typically develop into so‐called tumour associated macrophages with a distinct profile of activities which lead to a reduction in inflammation and antigen presentation. The direct impact of tumour cell conditioned medium on the activity profile of macrophages in dependence of their complement component expression has not yet been investigated. Methods In our in vitro study, macrophages differentiated from bone marrows of properdin deficient and wildtype mice were stimulated with conditioned medium of a syngeneic tumour cell line, B16F10, a mouse melanoma subline. Results In comparison with macrophages from wildtype mice, those from congenic properdin deficient mice showed skewing towards M2 profile, encompassing mRNA expression for genes involved in arginine metabolism, production of type 2 cytokines, and relatively lower surface expression of molecules needed for antigen presentation. Conclusions These data suggest that properdin insufficiency promotes a tumour environment that helps the tumour evade the immune response.
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Affiliation(s)
- Izzat A M Al-Rayahi
- Department of Infection, Immunity and InflammationUniversity of LeicesterLeicesterUK; Department of Medical Laboratory TechnologyCollege of Health and Medical TechnologyBaghdadIraq
| | - Michael J Browning
- Department of Infection, Immunity and InflammationUniversity of LeicesterLeicesterUK; Department of ImmunologyLeicester Royal InfirmaryLeicesterUK
| | - Cordula Stover
- Department of Infection, Immunity and Inflammation University of Leicester Leicester UK
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Marion E, Jarry U, Cano C, Savary C, Beauvillain C, Robbe-Saule M, Preisser L, Altare F, Delneste Y, Jeannin P, Marsollier L. FVB/N Mice Spontaneously Heal Ulcerative Lesions Induced by Mycobacterium ulcerans and Switch M. ulcerans into a Low Mycolactone Producer. THE JOURNAL OF IMMUNOLOGY 2016; 196:2690-8. [DOI: 10.4049/jimmunol.1502194] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 01/15/2016] [Indexed: 12/29/2022]
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Wang C, Wei LL, Shi LY, Pan ZF, Yu XM, Li TY, Liu CM, Ping ZP, Jiang TT, Chen ZL, Mao LG, Li ZJ, Li JC. Screening and identification of five serum proteins as novel potential biomarkers for cured pulmonary tuberculosis. Sci Rep 2015; 5:15615. [PMID: 26499913 PMCID: PMC4620482 DOI: 10.1038/srep15615] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Accepted: 09/29/2015] [Indexed: 01/14/2023] Open
Abstract
Rapid and efficient methods for the determination of cured tuberculosis (TB) are lacking. A total of 85 differentially expressed serum proteins were identified by iTRAQ labeling coupled with two-dimensional liquid chromatography-tandem mass spectrometry (2D LC-MS/MS) analysis (fold change >1.50 or <0.60, P < 0.05). We validated albumin (ALB), Rho GDP-dissociation inhibitor 2 (ARHGDIB), complement 3 (C3), ficolin-2 (FCN2), and apolipoprotein (a) (LPA) using the enzyme-linked immunosorbent assay (ELISA) method. Significantly increased ALB and LPA levels (P = 0.036 and P = 0.012, respectively) and significantly reduced ARHGDIB, C3, and FCN2 levels (P < 0.001, P = 0.035, and P = 0.018, respectively) were observed in cured TB patients compared with untreated TB patients. In addition, changes in ALB and FCN2 levels occurred after 2 months of treatment (P < 0.001 and P = 0.030, respectively). We established a cured TB model with 87.10% sensitivity, 79.49% specificity, and an area under the curve (AUC) of 0.876. The results indicated that ALB, ARHGDIB, C3, FCN2, and LPA levels might serve as potential biomarkers for cured TB. Our study provides experimental data for establishing objective indicators of cured TB and also proposes potential markers for evaluating the efficacy of anti-TB drugs.
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Affiliation(s)
- Chong Wang
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Li-Liang Wei
- Department of Respiratory Medicine, The Sixth Hospital of Shaoxing, Shaoxing 312000, P.R. China
| | - Li-Ying Shi
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou 310013, P.R. China
| | - Zhi-Fen Pan
- Department of Tuberculosis, The First Hospital of Jiaxing, Jiaxing 314001, P.R. China
| | - Xiao-Mei Yu
- Department of Clinical Laboratory, Zhejiang Hospital, Hangzhou 310013, P.R. China
| | - Tian-Yu Li
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Chang-Ming Liu
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Ze-Peng Ping
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Ting-Ting Jiang
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Zhong-Liang Chen
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Lian-Gen Mao
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Zhong-Jie Li
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Ji-Cheng Li
- Institute of Cell Biology, Zhejiang University, Hangzhou 310058, P.R. China
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Elgendy R, Giantin M, Montesissa C, Dacasto M. Transcriptomic analysis of skeletal muscle from beef cattle exposed to illicit schedules containing dexamethasone: identification of new candidate biomarkers and their validation using samples from a field monitoring trial. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2015; 32:1448-63. [DOI: 10.1080/19440049.2015.1070307] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chen J, Zhang H, Zhou Z, Yang Z, Ding Y, Zhou Z, Zhong E, Arulanandam B, Baseman J, Zhong G. Chlamydial induction of hydrosalpinx in 11 strains of mice reveals multiple host mechanisms for preventing upper genital tract pathology. PLoS One 2014; 9:e95076. [PMID: 24736397 PMCID: PMC3988139 DOI: 10.1371/journal.pone.0095076] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 03/22/2014] [Indexed: 11/18/2022] Open
Abstract
The female lower genital tract is constantly exposed to microbial infection, some of which can ascend to and cause pathology such as hydrosalpinx in the upper genital tract, which can affect fertility. To understand host mechanisms for preventing upper genital tract pathology, we screened 11 inbred strains of mice for hydrosalpinx induction by C. muridarum. When examined on days 60 to 80 after intravaginal infection, the 11 strains fell into 3 groups based on their hydrosalpinx severity: CBA/J and SJL/J mice were highly susceptible with a hydrosalpinx score of 5 or greater; Balb/c, C57BL/6J, C57BL/10J, C3H/HeJ and C3H/HeN were susceptible with a score between 1 and <5; NOD/ShiLtJ, DBA/1J, DBA/2J and A/J were resistant with a score of <1. The diverse range of mouse susceptibility to hydrosalpinx induction may reflect the varied clinical outcomes of C. trachomatis-infected women. When the 11 strains were infected via an intrauterine inoculation to bypass the requirement for ascension, higher incidence and more severe hydrosalpinges were induced in most mice, indicating that the interaction between chlamydial ascension and host control of ascension is critical for determining susceptibility to hydrosalpinx development in many mice. However, a few mouse strains resisted significant exacerbation of hydrosalpinx by intrauterine infection, indicating that these mice have evolved ascension-independent mechanisms for preventing upper genital tract pathology. Together, the above observations have demonstrated that different strains of mice can prevent upper genital tract pathology by using different mechanisms.
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Affiliation(s)
- Jianlin Chen
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
- Departments of Obstetrics and Gynecology, Pathology and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Hongbo Zhang
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
- Departments of Obstetrics and Gynecology, Pathology and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhou Zhou
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Zhangsheng Yang
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Yiling Ding
- Departments of Obstetrics and Gynecology, Pathology and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Zhiguang Zhou
- Departments of Obstetrics and Gynecology, Pathology and Endocrinology, Second Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Edward Zhong
- Department of Economics, University of Wisconsin-Madison, Madison, Wisconsin, United States of America
| | - Bernard Arulanandam
- Department of Biology, University of Texas at San Antonio, San Antonio, Texas, United States of America
| | - Joel Baseman
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
| | - Guangming Zhong
- Department of Microbiology and Immunology, University of Texas Health Science Center at San Antonio, San Antonio, Texas, United States of America
- * E-mail:
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Lack of long-lasting hydrosalpinx in A/J mice correlates with rapid but transient chlamydial ascension and neutrophil recruitment in the oviduct following intravaginal inoculation with Chlamydia muridarum. Infect Immun 2014; 82:2688-96. [PMID: 24711570 DOI: 10.1128/iai.00055-14] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Lower genital tract infection with Chlamydia trachomatis and C. muridarum can induce long-lasting hydrosalpinx in the upper genital tract of women and female mice, respectively. However, A/J mice were highly resistant to induction of long-lasting hydrosalpinx by C. muridarum. We further compared host inflammatory responses and chlamydial infection courses between the hydrosalpinx-resistant A/J mice and CBA/J mice known to be susceptible to hydrosalpinx induction. Both mouse strains developed robust pyosalpinx during the acute phase followed by hydrosalpinx during the chronic phase. However, the hydrosalpinges disappeared in A/J mice by day 60 after infection, suggesting that some early hydrosalpinges are reversible. Although the overall inflammatory responses were indistinguishable between CBA/J and A/J mice, we found significantly more neutrophils in oviduct lumen of A/J mice on days 7 and 10, which correlated with a rapid but transient oviduct invasion by C. muridarum with a peak infection on day 7. In contrast, CBA/J mice developed a delayed and extensive oviduct infection. These comparisons have revealed an important role of the interactions of oviduct infection with inflammatory responses in chlamydial induction of long-lasting hydrosalpinx, suggesting that a rapid but transient invasion of oviduct by chlamydial organisms can prevent the development of the long-lasting hydrosalpinges.
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Ghorpade DS, Holla S, Sinha AY, Alagesan SK, Balaji KN. Nitric oxide and KLF4 protein epigenetically modify class II transactivator to repress major histocompatibility complex II expression during Mycobacterium bovis bacillus Calmette-Guerin infection. J Biol Chem 2013; 288:20592-606. [PMID: 23733190 DOI: 10.1074/jbc.m113.472183] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Pathogenic mycobacteria employ several immune evasion strategies such as inhibition of class II transactivator (CIITA) and MHC-II expression, to survive and persist in host macrophages. However, precise roles for specific signaling components executing down-regulation of CIITA/MHC-II have not been adequately addressed. Here, we demonstrate that Mycobacterium bovis bacillus Calmette-Guérin (BCG)-mediated TLR2 signaling-induced iNOS/NO expression is obligatory for the suppression of IFN-γ-induced CIITA/MHC-II functions. Significantly, NOTCH/PKC/MAPK-triggered signaling cross-talk was found critical for iNOS/NO production. NO responsive recruitment of a bifunctional transcription factor, KLF4, to the promoter of CIITA during M. bovis BCG infection of macrophages was essential to orchestrate the epigenetic modifications mediated by histone methyltransferase EZH2 or miR-150 and thus calibrate CIITA/MHC-II expression. NO-dependent KLF4 regulated the processing and presentation of ovalbumin by infected macrophages to reactive T cells. Altogether, our study delineates a novel role for iNOS/NO/KLF4 in dictating the mycobacterial capacity to inhibit CIITA/MHC-II-mediated antigen presentation by infected macrophages and thereby elude immune surveillance.
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Affiliation(s)
- Devram Sampat Ghorpade
- Department of Microbiology and Cell Biology, Indian Institute of Science, Bangalore 560012, India
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HE ZONGLIN, DU FAWANG, DU XIANZHI. The viable Mycobacterium tuberculosis H37Ra strain induces a stronger mouse macrophage response compared to the heat-inactivated H37Rv strain. Mol Med Rep 2013; 7:1597-602. [PMID: 23483126 DOI: 10.3892/mmr.2013.1363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2012] [Accepted: 02/28/2013] [Indexed: 11/05/2022] Open
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Complement factor C7 contributes to lung immunopathology caused by Mycobacterium tuberculosis. Clin Dev Immunol 2012; 2012:429675. [PMID: 22973398 PMCID: PMC3438787 DOI: 10.1155/2012/429675] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Accepted: 07/20/2012] [Indexed: 11/21/2022]
Abstract
Mycobacterium tuberculosis (MTB) remains a significant global health burden despite the availability of antimicrobial chemotherapy. Increasing evidence indicates a critical role of the complement system in the development of host protection against the bacillus, but few studies have specifically explored the function of the terminal complement factors. Mice deficient in complement C7 and wild-type C57BL/6 mice were aerosol challenged with MTB Erdman and assessed for bacterial burden, histopathology, and lung cytokine responses at days 30 and 60 post-infection. Macrophages isolated from C7 −/− and wild-type mice were evaluated for MTB proliferation and cytokine production. C7 −/− mice had significantly less liver colony forming units (CFUs) at day 30; no differences were noted in lung CFUs. The C7 deficient mice had markedly reduced lung occlusion with significantly increased total lymphocytes, decreased macrophages, and increased numbers of CD4+ cells 60 days post-infection. Expression of lung IFN-γ and TNF-α was increased at day 60 compared to wild-type mice. There were no differences in MTB-proliferation in macrophages isolated from wild-type and knock-out mice. These results indicate a role for complement C7 in the development of MTB induced immunopathology which warrants further investigation.
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Endsley JJ, Actor JK. Texas Tuberculosis Research Symposium 2011: collaborative efforts within the State of Texas toward elimination of TB. Tuberculosis (Edinb) 2011; 91 Suppl 1:S1-2. [PMID: 22192869 DOI: 10.1016/j.tube.2011.11.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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