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Nitschke J, Huber R, Vossio S, Moreau D, Marcourt L, Gindro K, Queiroz EF, Soldati T, Hanna N. Discovery of anti-infective compounds against Mycobacterium marinum after biotransformation of simple natural stilbenes by a fungal secretome. Front Microbiol 2024; 15:1439814. [PMID: 39355425 PMCID: PMC11443511 DOI: 10.3389/fmicb.2024.1439814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2024] [Accepted: 08/29/2024] [Indexed: 10/03/2024] Open
Abstract
Introduction Mycobacterium tuberculosis (Mtb), the causative agent of tuberculosis, remains a serious threat to human health worldwide and the quest for new anti-tubercular drugs is an enduring and demanding journey. Natural products (NPs) have played a significant role in advancing drug therapy of infectious diseases. Methods This study evaluated the suitability of a high-throughput infection system composed of the host amoeba Dictyostelium discoideum (Dd) and Mycobacterium marinum (Mm), a close relative of Mtb, to identify anti-infective compounds. Growth of Dd and intracellular Mm were quantified by using luminescence and fluorescence readouts in phenotypic assays. The system was first benchmarked with a set of therapeutic anti-Mtb antibiotics and then used to screen a library of biotransformed stilbenes. Results The study confirmed both efficacy of established antibiotics such as rifampicin and bedaquiline, with activities below defined anti-mycobacterium susceptibility breakpoints, and the lack of activity of pyrazinamide against Mm. The screening revealed the promising anti-infective activities of trans-δ-viniferins and in particular of two compounds 17 and 19 with an IC50 of 18.1 μM, 9 μM, respectively. Both compounds had no activity on Mm in broth. Subsequent exploration via halogenation and structure-activity relationship studies led to the identification of derivatives with improved selectivity and potency. The modes of action of the anti-infective compounds may involve inhibition of mycobacterial virulence factors or boosting of host defense. Discussion The study highlights the potential of biotransformation and NP-inspired derivatization approaches for drug discovery and underscores the utility of the Dd-Mm infection system in identifying novel anti-infective compounds.
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Affiliation(s)
- Jahn Nitschke
- Department of Biochemistry, Faculty of Science, University of Geneva, Geneva, Switzerland
| | - Robin Huber
- School of Pharmaceutical Sciences, University of Geneva, CMU, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Geneva, Switzerland
| | - Stefania Vossio
- ACCESS Screening Platform, NCCR Chemical Biology, Faculty of Science, University of Geneva, Geneva, Switzerland
| | - Dimitri Moreau
- ACCESS Screening Platform, NCCR Chemical Biology, Faculty of Science, University of Geneva, Geneva, Switzerland
| | - Laurence Marcourt
- School of Pharmaceutical Sciences, University of Geneva, CMU, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Geneva, Switzerland
| | - Katia Gindro
- Mycology Group, Research Department Plant Protection, Agroscope, Nyon, Switzerland
| | - Emerson F. Queiroz
- School of Pharmaceutical Sciences, University of Geneva, CMU, Geneva, Switzerland
- Institute of Pharmaceutical Sciences of Western Switzerland, University of Geneva, CMU, Geneva, Switzerland
| | - Thierry Soldati
- Department of Biochemistry, Faculty of Science, University of Geneva, Geneva, Switzerland
| | - Nabil Hanna
- Department of Biochemistry, Faculty of Science, University of Geneva, Geneva, Switzerland
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Dirks RP, Ordas A, Jong-Raadsen S, Brittijn SA, Haks MC, Henkel CV, Oravcova K, Racz PI, Tuinhof-Koelma N, Korzeniowska nee Wiweger MI, Gillespie SH, Meijer AH, Ottenhoff THM, Jansen HJ, Spaink HP. The Human Pathogen Mycobacterium tuberculosis and the Fish Pathogen Mycobacterium marinum Trigger a Core Set of Late Innate Immune Response Genes in Zebrafish Larvae. BIOLOGY 2024; 13:688. [PMID: 39336115 PMCID: PMC11429319 DOI: 10.3390/biology13090688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2024] [Revised: 08/26/2024] [Accepted: 08/29/2024] [Indexed: 09/30/2024]
Abstract
Zebrafish is a natural host of various Mycobacterium species and a surrogate model organism for tuberculosis research. Mycobacterium marinum is evolutionarily one of the closest non-tuberculous species related to M. tuberculosis and shares the majority of virulence genes. Although zebrafish is not a natural host of the human pathogen, we have previously demonstrated successful robotic infection of zebrafish embryos with M. tuberculosis and performed drug treatment of the infected larvae. In the present study, we examined for how long M. tuberculosis can be propagated in zebrafish larvae and tested a time series of infected larvae to study the transcriptional response via Illumina RNA deep sequencing (RNAseq). Bacterial aggregates carrying fluorescently labeled M. tuberculosis could be detected up to 9 days post-infection. The infected larvae showed a clear and specific transcriptional immune response with a high similarity to the inflammatory response of zebrafish larvae infected with the surrogate species M. marinum. We conclude that M. tuberculosis can be propagated in zebrafish larvae for at least one week after infection and provide further evidence that M. marinum is a good surrogate model for M. tuberculosis. The generated extensive transcriptome data sets will be of great use to add translational value to zebrafish as a model for infection of tuberculosis using the M. marinum infection system. In addition, we identify new marker genes such as dusp8 and CD180 that are induced by M. tuberculosis infection in zebrafish and in human macrophages at later stages of infection that can be further investigated.
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Affiliation(s)
- Ron P. Dirks
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Anita Ordas
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Susanne Jong-Raadsen
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Sebastiaan A. Brittijn
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Mariëlle C. Haks
- Department of Infectious Diseases, Leiden University Medical Center, 2300 RC Leiden, The Netherlands (T.H.M.O.)
| | - Christiaan V. Henkel
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Katarina Oravcova
- School of Biodiversity, One Health and Veterinary Medicine, University of Glasgow, Jarrett Building, Glasgow G61 1QH, UK;
| | - Peter I. Racz
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Nynke Tuinhof-Koelma
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | | | - Stephen H. Gillespie
- Medical and Biological Sciences Building, University of St Andrews, North Haugh, St Andrews, Fife KY16 9TF, UK;
| | | | - Tom H. M. Ottenhoff
- Department of Infectious Diseases, Leiden University Medical Center, 2300 RC Leiden, The Netherlands (T.H.M.O.)
| | - Hans J. Jansen
- ZF-Screens B.V., J.H. Oortweg 19, 2333 CH Leiden, The Netherlands (S.A.B.); (C.V.H.); (P.I.R.); (N.T.-K.); (M.I.K.n.W.); (H.J.J.)
| | - Herman P. Spaink
- Institute of Biology, Leiden University, 2333 CC Leiden, The Netherlands;
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3
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Dong C, Wang Y, Cai Y, Wu Y, Chen W, Wang L, Liu X, Zou L, Wang J. Enhance the Antimycobacterial Activity of Streptomycin with Ebselen as an Antibiotic Adjuvant Through Disrupting Redox Homeostasis. Drug Des Devel Ther 2024; 18:3811-3824. [PMID: 39219694 PMCID: PMC11365518 DOI: 10.2147/dddt.s475535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2024] [Accepted: 08/18/2024] [Indexed: 09/04/2024] Open
Abstract
Purpose Tuberculosis (TB) remains a major health threat worldwide, and the spread of drug-resistant (DR) TB impedes the reduction of the global disease burden. Ebselen (EbSe) targets bacterial thioredoxin reductase (bTrxR) and causes an imbalance in the redox status of bacteria. Previous work has shown that the synergistic action of bTrxR and sensitization to common antibiotics by EbSe is a promising strategy for the treatment of DR pathogens. Thus, we aimed to evaluate whether EbSe could enhance anti-TB drugs against Mycobacterium marinum (M. marinum) which is genetically related to Mycobacterium tuberculosis (Mtb) and resistant to many antituberculosis drugs. Methods Minimum inhibitory concentrations (MIC) of isoniazid (INH), rifampicin (RFP), and streptomycin (SM) against M. marinum were determined by microdilution. The Bliss Independence Model was used to determine the adjuvant effects of EbSe over the anti-TB drugs. Thioredoxin reductase activity was measured using the DTNB assay, and its effects on bacterial redox homeostasis were verified by the elevation of intracellular ROS levels and intracellular GSH levels. The adjuvant efficacy of EbSe as an anti-TB drug was further evaluated in a mouse model of M. marinum infection. Cytotoxicity was observed in the macrophage cells Raw264.7 and mice model. Results The results reveal that EbSe acts as an antibiotic adjuvant over SM on M. marinum. EbSe + SM disrupted the intracellular redox microenvironment of M. marinum by inhibiting bTrxR activity, which could rescue mice from the high bacterial load, and accelerated recovery from tail injury with low mammalian toxicity. Conclusion The above studies suggest that EbSe significantly enhanced the anti-Mtb effect of SM, and its synergistic combination showed low mammalian toxicity in vitro and in vivo. Further efforts are required to study the underlying mechanisms of EbSe as an antibiotic adjuvant in combination with anti-TB drug MS.
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Affiliation(s)
- Chuanjiang Dong
- Department of Urology, The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong province, 523718, People’s Republic of China
| | - Yueqing Wang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
- Yichang Key Laboratory of Infection and Inflammation, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Yi Cai
- Department of Laboratory Medicine, Xiaogan Central Hospital, Xiaogan, Hubei Province, 432099, People’s Republic of China
| | - Yuhuang Wu
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
- Yichang Key Laboratory of Infection and Inflammation, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Wei Chen
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
- Yichang Key Laboratory of Infection and Inflammation, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Lu Wang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
- Yichang Key Laboratory of Infection and Inflammation, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Xiaowen Liu
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Lili Zou
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
- Yichang Key Laboratory of Infection and Inflammation, College of Basic Medical Science, China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
| | - Jun Wang
- The Second People’s Hospital of China Three Gorges University, Yichang, Hubei Province, 443002, People’s Republic of China
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Jia P, Peng S, Zhang Y, Zhao J, Zhao Q, Wu X, Shen F, Sun K, Yu L, Cen S. Identification of immune-associated genes involved in latent Mycobacterium marinum infection. Microbes Infect 2024:105407. [PMID: 39178982 DOI: 10.1016/j.micinf.2024.105407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 07/22/2024] [Accepted: 08/13/2024] [Indexed: 08/26/2024]
Abstract
Tuberculosis (TB) is a high mortality infectious disease caused by Mycobacterium tuberculosis (Mtb), and often develops into latent infection. About 5~10% of latent infections turn into active tuberculosis when the host immune system becomes deficient. Therefore, exploring the latent infection mechanism of Mtb is pivotal for the prevention and treatment of tuberculosis. We first established the zebrafish latent infection model and the chronic infection model utilizing Mycobacterium marinum, which has the highly similar gene background to Mtb. Using the latent infection model, we characterized the gene expression profiles and found 462 genes expressed differentially in the latent period and chronic tuberculosis infection. These differentially expressed genes are involved in various biological processes including transcription, transcriptional regulation, organism development, and immune responses. Among them, nineteen immune-related genes were found to express differentially in the latent period. By analyzing immune related protein network, the genes in the center of the network, including Nos2b, TNFα, IL1, TNFβ, TLR1, TLR2, and TLR4b, displayed significant deferential expression in latent infection and chronic infection period of zebrafish, suggesting that these genes might play an important role in controlling latent infection of Mtb. Identifying immune biomarker related to the status of tuberculosis latent infection might lead to novel strategy for diagnosis and treatment.
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Affiliation(s)
- Pingping Jia
- Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, China; Key Laboratory of Cancer FSMP for State Market Regulation, Beijing, China.
| | - Shize Peng
- Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences, Beijing, China
| | - Yi Zhang
- Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences, Beijing, China
| | - Jianyuan Zhao
- Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences, Beijing, China
| | - Qianqian Zhao
- Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, China; Key Laboratory of Cancer FSMP for State Market Regulation, Beijing, China
| | - Xiaoxiao Wu
- Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, China; Key Laboratory of Cancer FSMP for State Market Regulation, Beijing, China
| | - Fangqi Shen
- Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, China; Key Laboratory of Cancer FSMP for State Market Regulation, Beijing, China
| | - Kai Sun
- Department of Clinical Nutrition, Beijing Shijitan Hospital, Capital Medical University, Beijing, China; Key Laboratory of Cancer FSMP for State Market Regulation, Beijing, China
| | - Liyan Yu
- Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences, Beijing, China
| | - Shan Cen
- Institute of Medicinal Biotechnology Chinese Academy of Medical Sciences, Beijing, China.
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5
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Liu C, Hao J, Song M, Ye J, Zheng C, Huang Y, Feng Z, Jiang R, Shi Y, Gao W, Zuo H, Zhao Z, Zhang L. Mycobacterium marinum hand infection: a case report and literature review. Front Med (Lausanne) 2024; 11:1433153. [PMID: 39185466 PMCID: PMC11341394 DOI: 10.3389/fmed.2024.1433153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Accepted: 07/19/2024] [Indexed: 08/27/2024] Open
Abstract
Mycobacterium marinum, a photochromogenic, slow-growing mycobacterium, thrives in both marine and freshwater environments. Optimal growth occurs between 25°C and 35°C, with survival becoming challenging above 37°C. Typically, M. marinum enters the body via skin abrasions, often leading to infections of the upper extremities. Diagnosis of M. marinum infection is frequently challenging and delayed due to the difficult pathogen identification. At present, a standardized treatment protocol has yet to be established. Presented herein is a case study detailing an infection of the right hand's middle finger caused by M. marinum. Notably, his occupation as a chef, handling fish and seafood post-injury, was a significant factor. Histological examination of the skin biopsy and positive acid-fast staining were consistent with a diagnosis of mycobacterial infection. Pathological examination confirmed a skin infection with infectious granuloma, and tissue section acid-fast staining revealed acid-fast bacill. Cultures on Columbia blood agar yielded rough, flattened, yellow-fleshy colonies after 10 days, which was identified as M. marinum through 16S rRNA sequencing. The patient responded well to a 3-month regimen of oral moxifloxacin (0.4 qd) and linezolid (0.6 qd), resulting in rash resolution and pain relief, with no recurrence observed for 1-year follow-up. This report presents the first documented acid-fast staining images of M. marinum tissue sections and colony morphology photographs, offering an in-depth view of M. marinum's morphological characteristics. It aims to enhance awareness of M. marinum infections, underscore the necessity for clinicians to delve into patient histories, and provide a review of the clinical manifestations, diagnostic techniques, therapeutic approaches, and pathogenic mechanisms associated with M. marinum.
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Affiliation(s)
- Chunping Liu
- Department of Dermatology, Hebei Medical University Third Hospital, Shijiazhuang, China
| | - Jiahao Hao
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Minghui Song
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Jiaqing Ye
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Cuiying Zheng
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
| | - Yinqi Huang
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
| | - Zhongjun Feng
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
| | - Ruiping Jiang
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Yan Shi
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Weili Gao
- Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang, China
| | - Huifen Zuo
- Department of Clinical Laboratory, Hebei Yiling Hospital, Shijiazhuang, Hebei, China
| | - Zhenjun Zhao
- Department of Clinical Laboratory, Hebei Yiling Hospital, Shijiazhuang, Hebei, China
| | - Lijie Zhang
- Department of Clinical Laboratory, Hebei Medical University Third Hospital, Shijiazhuang, China
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Guallar-Garrido S, Soldati T. Exploring host-pathogen interactions in the Dictyostelium discoideum-Mycobacterium marinum infection model of tuberculosis. Dis Model Mech 2024; 17:dmm050698. [PMID: 39037280 DOI: 10.1242/dmm.050698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2024] Open
Abstract
Mycobacterium tuberculosis is a pathogenic mycobacterium that causes tuberculosis. Tuberculosis is a significant global health concern that poses numerous clinical challenges, particularly in terms of finding effective treatments for patients. Throughout evolution, host immune cells have developed cell-autonomous defence strategies to restrain and eliminate mycobacteria. Concurrently, mycobacteria have evolved an array of virulence factors to counteract these host defences, resulting in a dynamic interaction between host and pathogen. Here, we review recent findings, including those arising from the use of the amoeba Dictyostelium discoideum as a model to investigate key mycobacterial infection pathways. D. discoideum serves as a scalable and genetically tractable model for human phagocytes, providing valuable insights into the intricate mechanisms of host-pathogen interactions. We also highlight certain similarities between M. tuberculosis and Mycobacterium marinum, and the use of M. marinum to more safely investigate mycobacteria in D. discoideum.
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Affiliation(s)
- Sandra Guallar-Garrido
- Department of Biochemistry, Faculty of Science, University of Geneva, 30 quai Ernest-Ansermet, Science II, 1211 Geneva-4, Switzerland
| | - Thierry Soldati
- Department of Biochemistry, Faculty of Science, University of Geneva, 30 quai Ernest-Ansermet, Science II, 1211 Geneva-4, Switzerland
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7
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Johansen MD, Spaink HP, Oehlers SH, Kremer L. Modeling nontuberculous mycobacterial infections in zebrafish. Trends Microbiol 2024; 32:663-677. [PMID: 38135617 DOI: 10.1016/j.tim.2023.11.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 11/24/2023] [Accepted: 11/27/2023] [Indexed: 12/24/2023]
Abstract
The incidence of infections due to nontuberculous mycobacteria (NTM) has increased rapidly in recent years, surpassing tuberculosis in developed countries. Due to inherent antimicrobial resistance, NTM infections are particularly difficult to treat with low cure rates. There is an urgent need to understand NTM pathogenesis and to develop novel therapeutic approaches for the treatment of NTM diseases. Zebrafish have emerged as an excellent animal model due to genetic amenability and optical transparency during embryonic development, allowing spatiotemporal visualization of host-pathogen interactions. Furthermore, adult zebrafish possess fully functional innate and adaptive immunity and recapitulate important pathophysiological hallmarks of mycobacterial infection. Here, we report recent breakthroughs in understanding the hallmarks of NTM infections using the zebrafish model.
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Affiliation(s)
- Matt D Johansen
- Centre for Inflammation, Centenary Institute and University of Technology Sydney, Faculty of Science, School of Life Sciences, Sydney, NSW, Australia
| | - Herman P Spaink
- Institute of Biology, Leiden University, Leiden, The Netherlands
| | - Stefan H Oehlers
- A*STAR Infectious Diseases Labs (A*STAR ID Labs), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore
| | - Laurent Kremer
- Centre National de la Recherche Scientifique, UMR 9004, Institut de Recherche en Infectiologie de Montpellier (IRIM), Université de Montpellier, 1919 Route de Mende, 34293, Montpellier, France; INSERM, IRIM, 34293 Montpellier, France.
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8
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Vidyasagar, Patel RR, Singh SK, Dehari D, Nath G, Singh M. Facile green synthesis of silver nanoparticles derived from the medicinal plant Clerodendrum serratum and its biological activity against Mycobacterium species. Heliyon 2024; 10:e31116. [PMID: 38799742 PMCID: PMC11126841 DOI: 10.1016/j.heliyon.2024.e31116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Revised: 05/09/2024] [Accepted: 05/10/2024] [Indexed: 05/29/2024] Open
Abstract
The emergence of multidrug-resistant mycobacterial strains is a significant crisis that has led to higher treatment failure rates and more toxic and expensive medications for tuberculosis (TB). The urgent need to develop novel therapeutics has galvanized research interest towards developing alternative antimicrobials such as silver nanoparticles (AgNPs). The current study focused on the anti-mycobacterial activity of green-synthesized AgNPs and its polyethylene glycol encapsulated derivative (PEG-AgNPs) with improved stability using the leaves extract of Clerodendrum serratum. Different characterization methods were used to analyze them. DLS analysis revealed a lower polydispersity index of PEG-AgNPs, suggesting a more uniform size distribution than that of AgNPs. The HR-TEM results revealed that the AgNPs and PEG-AgNPs have predominantly spherical shapes in the size range of 9-35 nm and 15-60 nm, respectively, while positive values of Zeta potential indicate their stability. FTIR-ATR analysis confirmed the presence of functional groups responsible for reducing and capping the bio-reduced AgNPs, whereas the XRD data established its crystalline nature. Impressively, the PEG-AgNPs exhibited maximum inhibitory activity against different Tubercular and Non-Tuberculous Mycobacterium species i.e., Mycobacterium smegmatis, Mycobacterium fortuitum and Mycobacterium marinum, relative to those of AgNPs and Linezolid. The flow cytometry assay showed that the anti-mycobacterial action was mediated by an increase in cell wall permeability. Notably, the results of AFM confirm their ability to inhibit mycobacterial biofilm significantly. We demonstrated the nontoxic nature of these AgNPs, explicated by the absence of hemolytic activity against human RBCs. Overall, the results suggest that PEG-AgNPs could offer a novel therapeutic approach with potential anti-mycobacterial activity and can overcome the limitations of existing TB therapies.
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Affiliation(s)
- Vidyasagar
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Ritu Raj Patel
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Sudhir Kumar Singh
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Deepa Dehari
- Department of Pharmaceutical Engineering and Technology, Indian Institute of Technology (Banaras Hindu University), Varanasi, Uttar Pradesh, 221005, India
| | - Gopal Nath
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Meenakshi Singh
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Sciences, Banaras Hindu University, Varanasi, 221005, India
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Savijoki K, Deptula P, Roberts RJ, Hammarén M, Yli-Kauhaluoma J, Varmanen P, Parikka M. Revised whole genome and DNA methylome of Mycobacterium marinum type strain ATCC 927 T. Microbiol Resour Announc 2024; 13:e0101623. [PMID: 38415640 PMCID: PMC11008211 DOI: 10.1128/mra.01016-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 02/15/2024] [Indexed: 02/29/2024] Open
Abstract
Mycobacterium marinum, a slow-growing Actinobacterium, typically induces tuberculosis-like disease in fish. Here, we report a new reference sequence for M. marinum ATCC 927T, along with its DNA methylome. This aims to maximize the research potential of this type strain and facilitates investigations into the pathomechanisms of human tuberculosis.
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Affiliation(s)
- Kirsi Savijoki
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Paulina Deptula
- Department of Food Science (FOOD), University of Copenhagen, Frederiksberg, Denmark
| | | | - Milka Hammarén
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- European Molecular Biology Laboratory, Heidelberg, Germany
| | - Jari Yli-Kauhaluoma
- Drug Research Program, Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Pekka Varmanen
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Mataleena Parikka
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
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10
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Nicholson KR, Cronin RM, Prest RJ, Menon AR, Yang Y, Jennisch MK, Champion MM, Tobin DM, Champion PA. The antagonistic transcription factors, EspM and EspN, regulate the ESX-1 secretion system in M. marinum. mBio 2024; 15:e0335723. [PMID: 38445877 PMCID: PMC11005418 DOI: 10.1128/mbio.03357-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Accepted: 02/13/2024] [Indexed: 03/07/2024] Open
Abstract
Bacterial pathogens use protein secretion systems to transport virulence factors and regulate gene expression. Among pathogenic mycobacteria, including Mycobacterium tuberculosis and Mycobacterium marinum, the ESAT-6 system 1 (ESX-1) secretion is crucial for host interaction. Secretion of protein substrates by the ESX-1 secretion system disrupts phagosomes, allowing mycobacteria cytoplasmic access during macrophage infections. Deletion or mutation of the ESX-1 system attenuates mycobacterial pathogens. Pathogenic mycobacteria respond to the presence or absence of the ESX-1 system in the cytoplasmic membrane by altering transcription. Under laboratory conditions, the EspM repressor and WhiB6 activator control transcription of specific ESX-1-responsive genes, including the ESX-1 substrate genes. However, deleting the espM or whiB6 gene does not phenocopy the deletion of the ESX-1 substrate genes during macrophage infection by M. marinum. In this study, we identified EspN, a critical transcription factor whose activity is masked by the EspM repressor under laboratory conditions. In the absence of EspM, EspN activates transcription of whiB6 and ESX-1 genes during both laboratory growth and macrophage infection. EspN is also independently required for M. marinum growth within and cytolysis of macrophages, similar to the ESX-1 genes, and for disease burden in a zebrafish larval model of infection. These findings suggest that EspN and EspM coordinate to counterbalance the regulation of the ESX-1 system and support mycobacterial pathogenesis.IMPORTANCEPathogenic mycobacteria, which are responsible for tuberculosis and other long-term diseases, use the ESX-1 system to transport proteins that control the host response to infection and promote bacterial survival. In this study, we identify an undescribed transcription factor that controls the expression of ESX-1 genes and is required for both macrophage and animal infection. However, this transcription factor is not the primary regulator of ESX-1 genes under standard laboratory conditions. These findings identify a critical transcription factor that likely controls expression of a major virulence pathway during infection, but whose effect is not detectable with standard laboratory strains and growth conditions.
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Affiliation(s)
- Kathleen R. Nicholson
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
| | - Rachel M. Cronin
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
| | - Rebecca J. Prest
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
| | - Aruna R. Menon
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Yuwei Yang
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
| | - Madeleine K. Jennisch
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
| | - Matthew M. Champion
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA
| | - David M. Tobin
- Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Immunology, Duke University School of Medicine, Durham, North Carolina, USA
| | - Patricia A. Champion
- Department of Biological Sciences, Eck Institute for Global Health, University of Notre Dame, Notre Dame, Indiana, USA
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11
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Nonarath HJT, Jackson MA, Penoske RM, Zahrt TC, Price NPJ, Link BA. The tunicamycin derivative TunR2 exhibits potent antibiotic properties with low toxicity in an in vivo Mycobacterium marinum-zebrafish TB infection model. J Antibiot (Tokyo) 2024; 77:245-256. [PMID: 38238588 PMCID: PMC11403873 DOI: 10.1038/s41429-023-00694-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Revised: 11/20/2023] [Accepted: 11/24/2023] [Indexed: 03/28/2024]
Abstract
Tunicamycins (TUN) are well-defined, Streptomyces-derived natural products that inhibit protein N-glycosylation in eukaryotes, and by a conserved mechanism also block bacterial cell wall biosynthesis. TUN inhibits the polyprenylphosphate-N-acetyl-hexosamine-1-phospho-transferases (PNPT), an essential family of enzymes found in both bacteria and eukaryotes. We have previously published the development of chemically modified TUN, called TunR1 and TunR2, that have considerably reduced activity on eukaryotes but that retain the potent antibacterial properties. A mechanism for this reduced toxicity has also been reported. TunR1 and TunR2 have been tested against mammalian cell lines in culture and against live insect cells but, until now, no in vivo evaluation has been undertaken for vertebrates. In the current work, TUN, TunR1, and TunR2 are investigated for their relative toxicity and antimycobacterial activity in zebrafish using a well-established Mycobacterium marinum (M. marinum) infection system, a model for studying human Mycobacterium tuberculosis infections. We also report the relative ability to activate the unfolded protein response (UPR), the known mechanism for the eukaryotic toxicity observed with TUN treatment. Importantly, TunR1 and TunR2 retained their antimicrobial properties, as evidenced by a reduction in M. marinum bacterial burden, compared to DMSO-treated zebrafish. In summary, findings from this study highlight the characteristics of recently developed TUN derivatives, mainly TunR2, and its potential for use as a novel anti-bacterial agent for veterinary and potential medical purposes.
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Affiliation(s)
- Hannah J T Nonarath
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Michael A Jackson
- USDA, Agricultural Research Service, Renewable Products Technology Research, National Center for Agricultural Utilization Research, 1815 N. University St., Peoria, IL, 61604, USA
| | - Renee M Penoske
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Thomas C Zahrt
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Neil P J Price
- USDA, Agricultural Research Service, Renewable Products Technology Research, National Center for Agricultural Utilization Research, 1815 N. University St., Peoria, IL, 61604, USA.
| | - Brian A Link
- Department of Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, WI, USA.
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12
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Zhou S, Zhang D, Li D, Wang H, Ding C, Song J, Huang W, Xia X, Zhou Z, Han S, Jin Z, Yan B, Gonzales J, Via LE, Zhang L, Wang D. Pathogenic mycobacterium upregulates cholesterol 25-hydroxylase to promote granuloma development via foam cell formation. iScience 2024; 27:109204. [PMID: 38420591 PMCID: PMC10901098 DOI: 10.1016/j.isci.2024.109204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 11/20/2023] [Accepted: 02/07/2024] [Indexed: 03/02/2024] Open
Abstract
Pathogenic mycobacteria orchestrate the complex cell populations known as granuloma that is the hallmark of tuberculosis. Foam cells, a lipid-rich cell-type, are considered critical for granuloma formation; however, the causative factor in foam cell formation remains unclear. Atherosclerosis is a chronic inflammatory disease characterized by the abundant accumulation of lipid-laden-macrophage-derived foam cells during which cholesterol 25-hydroxylase (CH25H) is crucial in foam cell formation. Here, we show that M. marinum (Mm), a relative of M. tuberculosis, induces foam cell formation, leading to granuloma development following CH25H upregulation. Moreover, the Mm-driven increase in CH25H expression is associated with the presence of phthiocerol dimycocerosate, a determinant for Mm virulence and integrity. CH25H-null mice showed decreased foam cell formation and attenuated pathology. Atorvastatin, a recommended first-line lipid-lowering drug, promoted the elimination of M. marinum and concomitantly reduced CH25H production. These results define a previously unknown role for CH25H in controlling macrophage-derived foam cell formation and Tuberculosis pathology.
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Affiliation(s)
- Shuang Zhou
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Ding Zhang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Dan Li
- Department of Tuberculosis, The Third People’s Hospital of Yichang, Yichang 443003, P.R. China
| | - Hankun Wang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Cairong Ding
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Jingrui Song
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Weifeng Huang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Xuan Xia
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Ziwei Zhou
- State Key Laboratory of Genetic Engineering, Institute of Genetics, MOE Engineering Research Center of Gene Technology, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Shanshan Han
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
| | - Zhu Jin
- Department of Tuberculosis, The Third People’s Hospital of Yichang, Yichang 443003, P.R. China
| | - Bo Yan
- Shanghai Public Health Clinical Center, Fudan University, Shanghai China
| | - Jacqueline Gonzales
- Tuberculosis Research Section, Laboratory of Clinical Infectious Diseases, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20982, USA
| | - Laura E. Via
- Tuberculosis Research Section, Laboratory of Clinical Infectious Diseases, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20982, USA
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Lu Zhang
- State Key Laboratory of Genetic Engineering, Institute of Genetics, MOE Engineering Research Center of Gene Technology, School of Life Science, Fudan University, Shanghai 200433, P.R. China
| | - Decheng Wang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University; Institute of Infection and Inflammation, China Three Gorges University; College of Basic Medical Sciences, China Three Gorges University, Yichang 443002, P.R. China
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13
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Guzmán L, Cambier CJ, Cheng TY, Naqvi KF, Shiloh MU, Moody DB, Bertozzi CR. Bioorthogonal Metabolic Labeling of the Virulence Factor Phenolic Glycolipid in Mycobacteria. ACS Chem Biol 2024; 19:707-717. [PMID: 38442242 PMCID: PMC10949201 DOI: 10.1021/acschembio.3c00724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 02/15/2024] [Accepted: 02/21/2024] [Indexed: 03/07/2024]
Abstract
Surface lipids on pathogenic mycobacteria modulate infection outcomes by regulating host immune responses. Phenolic glycolipid (PGL) is a host-modulating surface lipid that varies among clinical Mycobacterium tuberculosis strains. PGL is also found in Mycobacterium marinum, where it promotes infection of zebrafish through effects on the innate immune system. Given the important role this lipid plays in the host-pathogen relationship, tools for profiling its abundance, spatial distribution, and dynamics are needed. Here, we report a strategy for imaging PGL in live mycobacteria using bioorthogonal metabolic labeling. We functionalized the PGL precursor p-hydroxybenzoic acid (pHB) with an azide group (3-azido pHB). When fed to mycobacteria, 3-azido pHB was incorporated into the cell surface, which could then be visualized via the bioorthogonal conjugation of a fluorescent probe. We confirmed that 3-azido pHB incorporates into PGL using mass spectrometry methods and demonstrated selectivity for PGL-producing M. marinum and M. tuberculosis strains. Finally, we applied this metabolic labeling strategy to study the dynamics of PGL within the mycobacterial membrane. This new tool enables visualization of PGL that may facilitate studies of mycobacterial pathogenesis.
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Affiliation(s)
- Lindsay
E. Guzmán
- Stanford
Sarafan ChEM-H, Stanford University, Stanford, California 94305, United States
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - C. J. Cambier
- Stanford
Sarafan ChEM-H, Stanford University, Stanford, California 94305, United States
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Tan-Yun Cheng
- Brigham
and Women’s Hospital, Division of Rheumatology, Inflammation
and Immunity, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Kubra F. Naqvi
- Department
of Internal Medicine, University of Texas
Southwestern Medical Center, Dallas, Texas 75390, United States
- Department
of Microbiology, University of Texas Southwestern
Medical Center, Dallas, Texas 75390, United States
| | - Michael U. Shiloh
- Department
of Internal Medicine, University of Texas
Southwestern Medical Center, Dallas, Texas 75390, United States
- Department
of Microbiology, University of Texas Southwestern
Medical Center, Dallas, Texas 75390, United States
| | - D. Branch Moody
- Brigham
and Women’s Hospital, Division of Rheumatology, Inflammation
and Immunity, Harvard Medical School, Boston, Massachusetts 02115, United States
| | - Carolyn R. Bertozzi
- Stanford
Sarafan ChEM-H, Stanford University, Stanford, California 94305, United States
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
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14
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Fröhlich E. Animals in Respiratory Research. Int J Mol Sci 2024; 25:2903. [PMID: 38474149 DOI: 10.3390/ijms25052903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 02/20/2024] [Accepted: 02/27/2024] [Indexed: 03/14/2024] Open
Abstract
The respiratory barrier, a thin epithelial barrier that separates the interior of the human body from the environment, is easily damaged by toxicants, and chronic respiratory diseases are common. It also allows the permeation of drugs for topical treatment. Animal experimentation is used to train medical technicians, evaluate toxicants, and develop inhaled formulations. Species differences in the architecture of the respiratory tract explain why some species are better at predicting human toxicity than others. Some species are useful as disease models. This review describes the anatomical differences between the human and mammalian lungs and lists the characteristics of currently used mammalian models for the most relevant chronic respiratory diseases (asthma, chronic obstructive pulmonary disease, cystic fibrosis, pulmonary hypertension, pulmonary fibrosis, and tuberculosis). The generation of animal models is not easy because they do not develop these diseases spontaneously. Mouse models are common, but other species are more appropriate for some diseases. Zebrafish and fruit flies can help study immunological aspects. It is expected that combinations of in silico, in vitro, and in vivo (mammalian and invertebrate) models will be used in the future for drug development.
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Affiliation(s)
- Eleonore Fröhlich
- Center for Medical Research, Medical University of Graz, 8010 Graz, Austria
- Research Center Pharmaceutical Engineering GmbH, 8010 Graz, Austria
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15
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Serene LG, Webber K, Champion PA, Schorey JS. Mycobacterium tuberculosis SecA2-dependent activation of host Rig-I/MAVs signaling is not conserved in Mycobacterium marinum. PLoS One 2024; 19:e0281564. [PMID: 38394154 PMCID: PMC10889897 DOI: 10.1371/journal.pone.0281564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 11/02/2023] [Indexed: 02/25/2024] Open
Abstract
Retinoic acid inducible gene I (Rig-I) is a cytosolic pattern recognition receptor canonically described for its important role in sensing viral RNAs. Increasingly, bacterially-derived RNA from intracellular bacteria such as Mycobacterium tuberculosis, have been shown to activate the same host Rig-I/Mitochondrial antiviral sensing protein (MAVS) signaling pathway to drive a type-I interferon response that contributes to bacterial pathogenesis in vivo. In M. tuberculosis, this response is mediated by the protein secretion system SecA2, but little is known about whether this process is conserved in other pathogenic mycobacteria or the mechanism by which these nucleic acids gain access to the host cytoplasm. Because the M. tuberculosis and M. marinum SecA2 protein secretion systems share a high degree of genetic and functional conservation, we hypothesized that Rig-I/MAVS activation and subsequent induction of IFN-β secretion by host macrophages will also be conserved between these two mycobacterial species. To test this, we generated a ΔsecA2 M. marinum strain along with complementation strains expressing either the M. marinum or M. tuberculosis secA2 genes. Our results suggest that the ΔsecA2 strain has a growth defect in vitro but not in host macrophages. These intracellular growth curves also suggested that the calculation applied to estimate the number of bacteria added to macrophage monolayers in infection assays underestimates bacterial inputs for the ΔsecA2 strain. Therefore, to better examine secreted IFN-β levels when bacterial infection levels are equal across strains we plated bacterial CFUs at 2hpi alongside our ELISA based infections. This enabled us to normalize secreted levels of IFN-β to a standard number of bacteria. Applying this approach to both WT and MAVS-/- bone marrow derived macrophages we observed equal or higher levels of secreted IFN-β from macrophages infected with the ΔsecA2 M. marinum strain as compared to WT. Together our findings suggest that activation of host Rig-I/MAVS cytosolic sensors and subsequent induction of IFN-β response in a SecA2-dependent manner is not conserved in M. marinum under the conditions tested.
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Affiliation(s)
- Lindsay G. Serene
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Kylie Webber
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Patricia A. Champion
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
| | - Jeffrey S. Schorey
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN, United States of America
- Eck Institute for Global Health, University of Notre Dame, Notre Dame, IN, United States of America
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16
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Lefrançois LH, Nitschke J, Wu H, Panis G, Prados J, Butler RE, Mendum TA, Hanna N, Stewart GR, Soldati T. Temporal genome-wide fitness analysis of Mycobacterium marinum during infection reveals the genetic requirement for virulence and survival in amoebae and microglial cells. mSystems 2024; 9:e0132623. [PMID: 38270456 PMCID: PMC10878075 DOI: 10.1128/msystems.01326-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Accepted: 12/15/2023] [Indexed: 01/26/2024] Open
Abstract
Tuberculosis remains the most pervasive infectious disease and the recent emergence of drug-resistant strains emphasizes the need for more efficient drug treatments. A key feature of pathogenesis, conserved between the human pathogen Mycobacterium tuberculosis and the model pathogen Mycobacterium marinum, is the metabolic switch to lipid catabolism and altered expression of virulence genes at different stages of infection. This study aims to identify genes involved in sustaining viable intracellular infection. We applied transposon sequencing (Tn-Seq) to M. marinum, an unbiased genome-wide strategy combining saturation insertional mutagenesis and high-throughput sequencing. This approach allowed us to identify the localization and relative abundance of insertions in pools of transposon mutants. Gene essentiality and fitness cost of mutations were quantitatively compared between in vitro growth and different stages of infection in two evolutionary distinct phagocytes, the amoeba Dictyostelium discoideum and the murine BV2 microglial cells. In the M. marinum genome, 57% of TA sites were disrupted and 568 genes (10.2%) were essential, which is comparable to previous Tn-Seq studies on M. tuberculosis and M. bovis. Major pathways involved in the survival of M. marinum during infection of D. discoideum are related to DNA damage repair, lipid and vitamin metabolism, the type VII secretion system (T7SS) ESX-1, and the Mce1 lipid transport system. These pathways, except Mce1 and some glycolytic enzymes, were similarly affected in BV2 cells. These differences suggest subtly distinct nutrient availability or requirement in different host cells despite the known predominant use of lipids in both amoeba and microglial cells.IMPORTANCEThe emergence of biochemically and genetically tractable host model organisms for infection studies holds the promise to accelerate the pace of discoveries related to the evolution of innate immunity and the dissection of conserved mechanisms of cell-autonomous defenses. Here, we have used the genetically and biochemically tractable infection model system Dictyostelium discoideum/Mycobacterium marinum to apply a genome-wide transposon-sequencing experimental strategy to reveal comprehensively which mutations confer a fitness advantage or disadvantage during infection and compare these to a similar experiment performed using the murine microglial BV2 cells as host for M. marinum to identify conservation of virulence pathways between hosts.
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Affiliation(s)
- Louise H. Lefrançois
- Department of Biochemistry, Faculty of Science, University of Geneva, Science II, Geneva, Switzerland
| | - Jahn Nitschke
- Department of Biochemistry, Faculty of Science, University of Geneva, Science II, Geneva, Switzerland
| | - Huihai Wu
- Department of Microbial Sciences, School of Biosciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Gaël Panis
- Department of Microbiology and Molecular Medicine, Faculty of Medicine/CMU, University of Geneva, Institute of Genetics and Genomics in Geneva (iGE3), Genève, Switzerland
| | - Julien Prados
- Department of Microbiology and Molecular Medicine, Faculty of Medicine/CMU, University of Geneva, Institute of Genetics and Genomics in Geneva (iGE3), Genève, Switzerland
- Bioinformatics Support Platform for data analysis, Geneva University, Medicine Faculty, Geneva, Switzerland
| | - Rachel E. Butler
- Department of Microbial Sciences, School of Biosciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Tom A. Mendum
- Department of Microbial Sciences, School of Biosciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Nabil Hanna
- Department of Biochemistry, Faculty of Science, University of Geneva, Science II, Geneva, Switzerland
| | - Graham R. Stewart
- Department of Microbial Sciences, School of Biosciences, University of Surrey, Guildford, Surrey, United Kingdom
| | - Thierry Soldati
- Department of Biochemistry, Faculty of Science, University of Geneva, Science II, Geneva, Switzerland
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17
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Wen D, Meng C, Feng Y, Shen L, Liu Y, Sun W, Chen G, Wu C. Syringaldehyde Exhibits Antibacterial and Antioxidant Activities against Mycobacterium marinum Infection. Microorganisms 2024; 12:348. [PMID: 38399751 PMCID: PMC10893232 DOI: 10.3390/microorganisms12020348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Revised: 01/27/2024] [Accepted: 01/31/2024] [Indexed: 02/25/2024] Open
Abstract
Tuberculosis (TB) is caused by infection with Mycobacterium tuberculosis (Mtb), which has a unique resistance to many antimicrobial agents. TB has emerged as a significant worldwide health issue because of the rise of multidrug-resistant strains causing drug-resistant TB (DR-TB). As a result, the development of new drugs or effective strategies is crucial for patients with TB. Mycobacterium marinum (Mm) and Mtb are both species of mycobacteria. In zebrafish, Mm proliferates and forms chronic granulomatous infections, which are similar to Mtb infections in lung tissue. Syringaldehyde (SA) is a member of the phenolic aldehyde family found in various plants. Here, we investigated its antioxidative and antibacterial properties in Mm-infected cells and zebrafish. Our results demonstrated that SA inhibits Mm-infected pulmonary epithelial cells and inhibits the proliferation of Mm in Mm-infected zebrafish, suggesting that SA provides an antibacterial effect during Mm infection. Further study demonstrated that supplementation with SA inhibits the production of malondialdehyde (MDA) and reactive oxygen species (ROS) and increases the levels of reduced glutathione (GSH) in Mm-infection-induced macrophages. SA inhibits the levels of MDA in Mm-infected zebrafish, suggesting that SA exerts antioxidative effects in vivo. Additionally, we found that SA promotes the expression of NRF2/HO-1/NQO-1 and the activation of the AMPK-α1/AKT/GSK-3β signaling pathway. In summary, our data demonstrated that SA exerts antioxidative and antibacterial effects during Mm infection both in vivo and in vitro and that the antioxidative effects of SA may be due to the regulation of NRF2/HO-1/NQO-1 and the AMPK-α1/AKT/GSK-3β signaling pathway.
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Affiliation(s)
- Da Wen
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Chaoqun Meng
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Yazhi Feng
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Lin Shen
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Yiyao Liu
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Wei Sun
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Guangxin Chen
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
| | - Changxin Wu
- Institutes of Biomedical Sciences, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory of Medical Molecular Cell Biology, Shanxi University, Taiyuan 030006, China
- Shanxi Provincial Key Laboratory for Prevention and Treatment of Major Infectious Diseases, Shanxi University, Taiyuan 030006, China
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18
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Ghith A, Bell SG. The oxidation of steroid derivatives by the CYP125A6 and CYP125A7 enzymes from Mycobacterium marinum. J Steroid Biochem Mol Biol 2023; 235:106406. [PMID: 37793577 DOI: 10.1016/j.jsbmb.2023.106406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/24/2023] [Accepted: 09/30/2023] [Indexed: 10/06/2023]
Abstract
The members of the bacterial cytochrome P450 (CYP) monooxygenase family CYP125, catalyze the oxidation of steroid derivatives including cholesterol and phytosterols, as the initial activating step in their catabolism. However, several bacterial species contain multiple genes encoding CYP125 enzymes and other CYP enzymes which catalyze cholesterol/cholest-4-en-3-one hydroxylation. An important question is why these bacterium have more than one enzyme with overlapping substrate ranges capable of catalyzing the terminal oxidation of the alkyl chain of these sterols. To further understand the role of these enzymes we investigated CYP125A6 and CYP125A7 from Mycobacterium marinum with various cholesterol analogues. These have modifications on the A and B rings of the steroid and we assessed the substrate binding and catalytic activity of these with each enzyme. CYP125A7 gave similar results to those reported for the CYP125A1 enzyme from M. tuberculosis. Differences in the substrate binding and catalytic activity with the cholesterol analogues were observed with CYP125A6. For example, while cholesteryl sulfate could bind to both enzymes it was only oxidized by CYP125A6 and not by CYP125A7. CYP125A6 generated higher levels of metabolites with the majority of C-3 and C-7 substituted cholesterol analogues such 7-ketocholesterol. However, 5α-cholestan-3β-ol was only oxidized by CYP125A7 enzyme. The cholest-4-en-3-one and 7-ketocholesterol-bound forms of the CYP125A6 and CYP125A7 enzymes were modelled using AlphaFold. The structural models highlighted differences in the binding modes of the steroid derivatives within the same enzyme. Significant changes in the binding mode of the steroids between these CYP125 enzymes and other bacterial cholesterol oxidizing enzymes, CYP142A3 and CYP124A1, were also seen. Despite this, all these models predicted the selectivity for terminal methyl hydroxylation, in agreement with the experimental data.
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Affiliation(s)
- Amna Ghith
- Department of Chemistry, University of Adelaide, SA 5005, Australia
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, SA 5005, Australia.
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19
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Collars OA, Jones BS, Hu DD, Weaver SD, Sherman TA, Champion MM, Champion PA. An N-acetyltransferase required for ESAT-6 N-terminal acetylation and virulence in Mycobacterium marinum. mBio 2023; 14:e0098723. [PMID: 37772840 PMCID: PMC10653941 DOI: 10.1128/mbio.00987-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/09/2023] [Indexed: 09/30/2023] Open
Abstract
IMPORTANCE N-terminal acetylation is a protein modification that broadly impacts basic cellular function and disease in higher organisms. Although bacterial proteins are N-terminally acetylated, little is understood how N-terminal acetylation impacts bacterial physiology and pathogenesis. Mycobacterial pathogens cause acute and chronic disease in humans and in animals. Approximately 15% of mycobacterial proteins are N-terminally acetylated, but the responsible enzymes are largely unknown. We identified a conserved mycobacterial protein required for the N-terminal acetylation of 23 mycobacterial proteins including the EsxA virulence factor. Loss of this enzyme from M. marinum reduced macrophage killing and spread of M. marinum to new host cells. Defining the acetyltransferases responsible for the N-terminal protein acetylation of essential virulence factors could lead to new targets for therapeutics against mycobacteria.
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Affiliation(s)
- Owen A. Collars
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
- Eck Institute for Global Health, University of Note Dame, Notre Dame, Indiana, USA
| | - Bradley S. Jones
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
- Eck Institute for Global Health, University of Note Dame, Notre Dame, Indiana, USA
| | - Daniel D. Hu
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA
| | - Simon D. Weaver
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA
| | - Taylor A. Sherman
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
| | - Matthew M. Champion
- Eck Institute for Global Health, University of Note Dame, Notre Dame, Indiana, USA
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana, USA
| | - Patricia A. Champion
- Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, USA
- Eck Institute for Global Health, University of Note Dame, Notre Dame, Indiana, USA
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20
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Hunter L, Ruedas-Torres I, Agulló-Ros I, Rayner E, Salguero FJ. Comparative pathology of experimental pulmonary tuberculosis in animal models. Front Vet Sci 2023; 10:1264833. [PMID: 37901102 PMCID: PMC10602689 DOI: 10.3389/fvets.2023.1264833] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 09/22/2023] [Indexed: 10/31/2023] Open
Abstract
Research in human tuberculosis (TB) is limited by the availability of human tissues from patients, which is often altered by therapy and treatment. Thus, the use of animal models is a key tool in increasing our understanding of the pathogenesis, disease progression and preclinical evaluation of new therapies and vaccines. The granuloma is the hallmark lesion of pulmonary tuberculosis, regardless of the species or animal model used. Although animal models may not fully replicate all the histopathological characteristics observed in natural, human TB disease, each one brings its own attributes which enable researchers to answer specific questions regarding TB immunopathogenesis. This review delves into the pulmonary pathology induced by Mycobacterium tuberculosis complex (MTBC) bacteria in different animal models (non-human primates, rodents, guinea pigs, rabbits, cattle, goats, and others) and compares how they relate to the pulmonary disease described in humans. Although the described models have demonstrated some histopathological features in common with human pulmonary TB, these data should be considered carefully in the context of this disease. Further research is necessary to establish the most appropriate model for the study of TB, and to carry out a standard characterisation and score of pulmonary lesions.
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Affiliation(s)
- Laura Hunter
- Pathology Department, UK Health Security Agency (UKHSA), Porton Down, Salisbury, United Kingdom
- School of Biosciences and Medicine, University of Surrey, Guildford, United Kingdom
| | - Inés Ruedas-Torres
- Pathology Department, UK Health Security Agency (UKHSA), Porton Down, Salisbury, United Kingdom
- Department of Anatomy and Comparative Pathology and Toxicology, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus, Córdoba, Spain
| | - Irene Agulló-Ros
- Pathology Department, UK Health Security Agency (UKHSA), Porton Down, Salisbury, United Kingdom
- Department of Anatomy and Comparative Pathology and Toxicology, UIC Zoonosis y Enfermedades Emergentes ENZOEM, University of Córdoba, International Excellence Agrifood Campus, Córdoba, Spain
| | - Emma Rayner
- Pathology Department, UK Health Security Agency (UKHSA), Porton Down, Salisbury, United Kingdom
| | - Francisco J. Salguero
- Pathology Department, UK Health Security Agency (UKHSA), Porton Down, Salisbury, United Kingdom
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21
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Arch M, Vidal M, Fuentes E, Abat AS, Cardona PJ. The reproductive status determines tolerance and resistance to Mycobacterium marinum in Drosophila melanogaster. Evol Med Public Health 2023; 11:332-347. [PMID: 37868078 PMCID: PMC10590161 DOI: 10.1093/emph/eoad029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 07/27/2023] [Indexed: 10/24/2023] Open
Abstract
Sex and reproductive status of the host have a major impact on the immune response against infection. Our aim was to understand their impact on host tolerance or resistance in the systemic Mycobacterium marinum infection of Drosophila melanogaster. We measured host survival and bacillary load at time of death, as well as expression by quantitative real-time polymerase chain reaction of immune genes (diptericin and drosomycin). We also assessed the impact of metabolic and hormonal regulation in the protection against infection by measuring expression of upd3, impl2 and ecR. Our data showed increased resistance in actively mating flies and in mated females, while reducing their tolerance to infection. Data suggests that Toll and immune deficiency (Imd) pathways determine tolerance and resistance, respectively, while higher basal levels of ecR favours the stimulation of the Imd pathway. A dual role has been found for upd3 expression, linked to increased/decreased mycobacterial load at the beginning and later in infection, respectively. Finally, impl2 expression has been related to increased resistance in non-actively mating males. These results allow further assessment on the differences between sexes and highlights the role of the reproductive status in D. melanogaster to face infections, demonstrating their importance to determine resistance and tolerance against M. marinum infection.
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Affiliation(s)
- Marta Arch
- Tuberculosis Research Unit, Germans Trias i Pujol Research Institute (IGTP), Badalona, Catalonia, Spain
- Comparative Medicine and Bioimage Centre of Catalonia (CMCiB), Germans Trias i Pujol Research Institute (IGTP), 08916 Badalona, Catalonia, Spain
| | - Maria Vidal
- Tuberculosis Research Unit, Germans Trias i Pujol Research Institute (IGTP), Badalona, Catalonia, Spain
- Genetics and Microbiology Department, Universitat Autònoma de Barcelona, Bellaterra, Catalonia, Spain
| | - Esther Fuentes
- Tuberculosis Research Unit, Germans Trias i Pujol Research Institute (IGTP), Badalona, Catalonia, Spain
- Comparative Medicine and Bioimage Centre of Catalonia (CMCiB), Germans Trias i Pujol Research Institute (IGTP), 08916 Badalona, Catalonia, Spain
- Microbiology Department, Laboratori Clínic Metropolitana Nord, Germans Trias i Pujol University Hospital, 08916 Badalona, Catalonia, Spain
| | - Anmaw Shite Abat
- Tuberculosis Research Unit, Germans Trias i Pujol Research Institute (IGTP), Badalona, Catalonia, Spain
- Department of Veterinary Paraclinical Studies, University of Gondar, Gondar, Ethiopia
| | - Pere-Joan Cardona
- Tuberculosis Research Unit, Germans Trias i Pujol Research Institute (IGTP), Badalona, Catalonia, Spain
- Comparative Medicine and Bioimage Centre of Catalonia (CMCiB), Germans Trias i Pujol Research Institute (IGTP), 08916 Badalona, Catalonia, Spain
- Microbiology Department, Laboratori Clínic Metropolitana Nord, Germans Trias i Pujol University Hospital, 08916 Badalona, Catalonia, Spain
- Genetics and Microbiology Department, Universitat Autònoma de Barcelona, Bellaterra, Catalonia, Spain
- Centro de Investigación Biomédica en Red en Enfermedades Respiratorias (CIBERES), Instituto de Salud Carlos III (ISCIII), Madrid, Spain
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22
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Sang X, Xue X, Mi Z, Wang Z, Yu X, Sun L, Ma S, Wang Z, Liu H, Zhang F. Induction of IL-32 in the immune response of keratinocytes to Mycobacterium marinum infection. Exp Dermatol 2023; 32:1451-1458. [PMID: 37309674 DOI: 10.1111/exd.14848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/14/2023]
Abstract
Keratinocytes are the predominant cell type in the skin epidermis, and they not only protect the skin from the influence of external physical factors but also function as an immune barrier against microbial invasion. However, little is known regarding the immune defence mechanisms of keratinocytes against mycobacteria. Here, we performed single-cell RNA sequencing (scRNA-seq) on skin biopsy samples from patients with Mycobacterium marinum infection and bulk RNA sequencing (bRNA-seq) on M. marinum-infected keratinocytes in vitro. The combined analysis of scRNA-seq and bRNA-seq data revealed that several genes were upregulated in M. marinum-infected keratinocytes. Further in vitro validation of these genes by quantitative polymerase chain reaction and western blotting assay confirmed the induction of IL-32 in the immune response of keratinocytes to M. marinum infection. Immunohistochemistry also showed the high expression of IL-32 in patients' lesions. These findings suggest that IL-32 induction is a possible mechanism through which keratinocytes defend against M. marinum infection; this could provide new targets for the immunotherapy of chronic cutaneous mycobacterial infections.
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Affiliation(s)
- Xu Sang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Xiaotong Xue
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Zihao Mi
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Zhenzhen Wang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Xueping Yu
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Lele Sun
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Shanshan Ma
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Zhe Wang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Hong Liu
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
| | - Furen Zhang
- Shandong Provincial Hospital for Skin Diseases & Shandong Provincial Institute of Dermatology and Venereology, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan, China
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23
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Qin Y, Chen J, Xu K, Lu Y, Xu F, Shi J. Triad3A involved in the regulation of endotoxin tolerance and mycobactericidal activity through the NFκB-nitric oxide pathway. Immun Inflamm Dis 2023; 11:e925. [PMID: 37506157 PMCID: PMC10363814 DOI: 10.1002/iid3.925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 04/18/2023] [Accepted: 06/15/2023] [Indexed: 07/30/2023] Open
Abstract
INTRODUCTION Sepsis is characterized by an endotoxin tolerance phenotype that occurs in the stage of infection. Persistent bacterial infection can lead to immune cell exhaustion. Triad3A, an E3 ubiquitin ligase, negatively regulates its activation by TLR4. However, the effect of Triad3A on endotoxin tolerance and bactericidal ability in the state of endotoxin tolerance remains unclear. METHODS Using single dose LPS and repeated LPS stimulated macrophage cell lines at indicated times, we investigated miR-191, Tirad3A, TRAF3, TLR4, p-P65, TNF-α, IL-1β, and iNOS expression, the effect of miR-191 on Triad3A and TRAF3, gene loss-of-function analyses, the effect of Triad3A on TLR4, p-P65, cytokine, and mycobactericidal activity in endotoxin tolerant cells infected with Mycobacterium marinum. RESULTS Here we found that Triad3A is involved in regulating endotoxin tolerance. Our result also displayed that miR-191 expression is downregulated in macrophages in the state of endotoxin tolerance. miR-191 can directly bind to Triad3A and TRAF3. Additionally, knockdown of Triad3A can reverse the effect of decreasing TNF-α and IL-1β in endotoxin tolerant macrophages. Furthermore, we demonstrated that the TLR4-NF-κB-NO pathway was associated with Triad3A and responsible for the killing of intracellular mycobacteria in a tuberculosis sepsis model. CONCLUSIONS These results provide new insight into the mechanisms of Triad3A induced tolerogenic phenotype in macrophages, which can help the better comprehension of the pathogenesis involved in septic shock with infection of Mycobacterium tuberculosis, and suggest that Triad3A may be a potential drug target for the treatment of severe septic tuberculosis.
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Affiliation(s)
- Yongwei Qin
- Department of Clinical Laboratory, The Sixth People's Hospital of Nantong, Nantong, Jiangsu, China
- Department of Pathogen Biology, School of Medicine, Nantong University, Nantong, China
| | - Jinliang Chen
- Department of Respiratory Medicine, The Second Affiliated Hospital of Nantong University, Nantong First People's Hospital, Nantong, Jiangsu, China
| | - Kuang Xu
- Department of Pathogen Biology, School of Medicine, Nantong University, Nantong, China
| | - Yang Lu
- Department of Critical Care Medicine, Affiliated Hospital of Nantong University, Nantong, China
| | - Feifan Xu
- Department of Clinical Laboratory, The Sixth People's Hospital of Nantong, Nantong, Jiangsu, China
| | - Jiahai Shi
- Nantong Key Laboratory of Translational Medicine in Cardiothoracic Diseases, Nantong Clinical Medical Research Center of Cardiothoracic Disease, Institution of Translational Medicine in Cardiothoracic Diseases, Affiliated Hospital of Nantong University, Nantong, Jiangsu, China
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24
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Muñoz-Sánchez S, Varela M, van der Vaart M, Meijer AH. Using Zebrafish to Dissect the Interaction of Mycobacteria with the Autophagic Machinery in Macrophages. BIOLOGY 2023; 12:817. [PMID: 37372102 DOI: 10.3390/biology12060817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/24/2023] [Accepted: 05/31/2023] [Indexed: 06/29/2023]
Abstract
Existing drug treatment against tuberculosis is no match against the increasing number of multi-drug resistant strains of its causative agent, Mycobacterium tuberculosis (Mtb). A better understanding of how mycobacteria subvert the host immune defenses is crucial for developing novel therapeutic strategies. A potential approach is enhancing the activity of the autophagy machinery, which can direct bacteria to autophagolysosomal degradation. However, the interplay specifics between mycobacteria and the autophagy machinery must be better understood. Here, we analyzed live imaging data from the zebrafish model of tuberculosis to characterize mycobacteria-autophagy interactions during the early stages of infection in vivo. For high-resolution imaging, we microinjected fluorescent Mycobacterium marinum (Mm) into the tail fin tissue of zebrafish larvae carrying the GFP-LC3 autophagy reporter. We detected phagocytosed Mm clusters and LC3-positive Mm-containing vesicles within the first hour of infection. LC3 associations with these vesicles were transient and heterogeneous, ranging from simple vesicles to complex compound structures, dynamically changing shape by fusions between Mm-containing and empty vesicles. LC3-Mm-vesicles could adopt elongated shapes during cell migration or alternate between spacious and compact morphologies. LC3-Mm-vesicles were also observed in cells reverse migrating from the infection site, indicating that the autophagy machinery fails to control infection before tissue dissemination.
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Affiliation(s)
- Salomé Muñoz-Sánchez
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Mónica Varela
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Michiel van der Vaart
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Annemarie H Meijer
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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25
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Hammarén MM, Luukinen H, Sillanpää A, Remans K, Lapouge K, Custódio T, Löw C, Myllymäki H, Montonen T, Seeger M, Robertson J, Nyman TA, Savijoki K, Parikka M. In vitro and ex vivo proteomics of Mycobacterium marinum biofilms and the development of biofilm-binding synthetic nanobodies. mSystems 2023:e0107322. [PMID: 37184670 DOI: 10.1128/msystems.01073-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023] Open
Abstract
The antibiotic-tolerant biofilms present in tuberculous granulomas add an additional layer of complexity when treating mycobacterial infections, including tuberculosis (TB). For a more efficient treatment of TB, the biofilm forms of mycobacteria warrant specific attention. Here, we used Mycobacterium marinum (Mmr) as a biofilm-forming model to identify the abundant proteins covering the biofilm surface. We used biotinylation/streptavidin-based proteomics on the proteins exposed at the Mmr biofilm matrices in vitro to identify 448 proteins and ex vivo proteomics to detect 91 Mmr proteins from the mycobacterial granulomas isolated from adult zebrafish. In vitro and ex vivo proteomics data are available via ProteomeXchange with identifier PXD033425 and PXD039416, respectively. Data comparisons pinpointed the molecular chaperone GroEL2 as the most abundant Mmr protein within the in vitro and ex vivo proteomes, while its paralog, GroEL1, with a known role in biofilm formation, was detected with slightly lower intensity values. To validate the surface exposure of these targets, we created in-house synthetic nanobodies (sybodies) against the two chaperones and identified sybodies that bind the mycobacterial biofilms in vitro and those present in ex vivo granulomas. Taken together, the present study reports a proof-of-concept showing that surface proteomics in vitro and ex vivo proteomics combined are a valuable strategy to identify surface-exposed proteins on the mycobacterial biofilm. Biofilm-surface-binding nanobodies could be eventually used as homing agents to deliver biofilm-targeting treatments to the sites of persistent biofilm infection.
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Affiliation(s)
- Milka Marjut Hammarén
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- European Molecular Biology Laboratory, Heidelberg, Germany
| | - Hanna Luukinen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Alina Sillanpää
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Kim Remans
- European Molecular Biology Laboratory, Heidelberg, Germany
| | - Karine Lapouge
- European Molecular Biology Laboratory, Heidelberg, Germany
| | - Tânia Custódio
- Centre for Structural Systems Biology, Hamburg, Germany
- Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
- European Molecular Biology Laboratory, Hamburg, Germany
| | - Christian Löw
- Centre for Structural Systems Biology, Hamburg, Germany
- Deutsches Elektronen-Synchrotron (DESY), Hamburg, Germany
- European Molecular Biology Laboratory, Hamburg, Germany
| | - Henna Myllymäki
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Toni Montonen
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
| | - Markus Seeger
- Institute for Medical Microbiology, University of Zurich, Zurich, Switzerland
| | - Joseph Robertson
- Department of Immunology, University of Oslo, Oslo, Norway
- Oslo University Hospital, Oslo, Norway
| | - Tuula A Nyman
- Department of Immunology, University of Oslo, Oslo, Norway
- Oslo University Hospital, Oslo, Norway
| | - Kirsi Savijoki
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
- Faculty of Agriculture and Forestry, University of Helsinki, Helsinki, Finland
| | - Mataleena Parikka
- Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland
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26
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Patel P, Nandi A, Verma SK, Kaushik N, Suar M, Choi EH, Kaushik NK. Zebrafish-based platform for emerging bio-contaminants and virus inactivation research. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 872:162197. [PMID: 36781138 PMCID: PMC9922160 DOI: 10.1016/j.scitotenv.2023.162197] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/23/2023] [Accepted: 02/08/2023] [Indexed: 05/27/2023]
Abstract
Emerging bio-contaminants such as viruses have affected health and environment settings of every country. Viruses are the minuscule entities resulting in severe contagious diseases like SARS, MERS, Ebola, and avian influenza. Recent epidemic like the SARS-CoV-2, the virus has undergone mutations strengthen them and allowing to escape from the remedies. Comprehensive knowledge of viruses is essential for the development of targeted therapeutic and vaccination treatments. Animal models mimicking human biology like non-human primates, rats, mice, and rabbits offer competitive advantage to assess risk of viral infections, chemical toxins, nanoparticles, and microbes. However, their economic maintenance has always been an issue. Furthermore, the redundancy of experimental results due to aforementioned aspects is also in examine. Hence, exploration for the alternative animal models is crucial for risk assessments. The current review examines zebrafish traits and explores the possibilities to monitor emerging bio-contaminants. Additionally, a comprehensive picture of the bio contaminant and virus particle invasion and abatement mechanisms in zebrafish and human cells is presented. Moreover, a zebrafish model to investigate the emerging viruses such as coronaviridae and poxviridae has been suggested.
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Affiliation(s)
- Paritosh Patel
- Plasma Bioscience Research Center, Department of Electrical and Biological Physics, Kwangwoon University, 01897 Seoul, South Korea
| | - Aditya Nandi
- School of Biotechnology, KIIT University, Bhubaneswar 751024, Odisha, India
| | - Suresh K Verma
- School of Biotechnology, KIIT University, Bhubaneswar 751024, Odisha, India; Condensed Matter Theory Group, Materials Theory Division, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | - Neha Kaushik
- Department of Biotechnology, College of Engineering, The University of Suwon, 18323 Hwaseong, Republic of Korea
| | - Mrutyunjay Suar
- School of Biotechnology, KIIT University, Bhubaneswar 751024, Odisha, India
| | - Eun Ha Choi
- Plasma Bioscience Research Center, Department of Electrical and Biological Physics, Kwangwoon University, 01897 Seoul, South Korea.
| | - Nagendra Kumar Kaushik
- Plasma Bioscience Research Center, Department of Electrical and Biological Physics, Kwangwoon University, 01897 Seoul, South Korea.
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Schippers P, Rasheed S, Park YM, Risch T, Wagmann L, Hemmer S, Manier SK, Müller R, Herrmann J, Meyer MR. Evaluation of extraction methods for untargeted metabolomic studies for future applications in zebrafish larvae infection models. Sci Rep 2023; 13:7489. [PMID: 37161044 PMCID: PMC10170104 DOI: 10.1038/s41598-023-34593-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Accepted: 05/04/2023] [Indexed: 05/11/2023] Open
Abstract
Sample preparation in untargeted metabolomics should allow reproducible extractions of as many molecules as possible. Thus, optimizing sample preparation is crucial. This study compared six different extraction procedures to find the most suitable for extracting zebrafish larvae in the context of an infection model. Two one-phase extractions employing methanol (I) and a single miscible phase of methanol/acetonitrile/water (II) and two two-phase methods using phase separation between chloroform and methanol/water combinations (III and IV) were tested. Additional bead homogenization was used for methods III and IV (III_B and IV_B). Nine internal standards and 59 molecules of interest (MoInt) related to mycobacterial infection were used for method evaluation. Two-phase methods (III and IV) led to a lower feature count, higher peak areas of MoInt, especially amino acids, and higher coefficients of variation in comparison to one-phase extractions. Adding bead homogenization increased feature count, peak areas, and CVs. Extraction I showed higher peak areas and lower CVs than extraction II, thus being the most suited one-phase method. Extraction III and IV showed similar results, with III being easier to execute and less prone to imprecisions. Thus, for future applications in zebrafish larvae metabolomics and infection models, extractions I and III might be chosen.
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Affiliation(s)
- Philip Schippers
- Department of Experimental and Clinical Toxicology, Center for Molecular Signaling (PZMS), Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, 66421, Homburg, Germany
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
| | - Sari Rasheed
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover, Braunschweig, Germany
| | - Yu Mi Park
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
| | - Timo Risch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover, Braunschweig, Germany
| | - Lea Wagmann
- Department of Experimental and Clinical Toxicology, Center for Molecular Signaling (PZMS), Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, 66421, Homburg, Germany
| | - Selina Hemmer
- Department of Experimental and Clinical Toxicology, Center for Molecular Signaling (PZMS), Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, 66421, Homburg, Germany
| | - Sascha K Manier
- Department of Experimental and Clinical Toxicology, Center for Molecular Signaling (PZMS), Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, 66421, Homburg, Germany
| | - Rolf Müller
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover, Braunschweig, Germany
| | - Jennifer Herrmann
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI), Saarland University, Saarbrücken, Germany
- German Centre for Infection Research (DZIF), Partner Site Hannover, Braunschweig, Germany
| | - Markus R Meyer
- Department of Experimental and Clinical Toxicology, Center for Molecular Signaling (PZMS), Institute of Experimental and Clinical Pharmacology and Toxicology, Saarland University, 66421, Homburg, Germany.
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Ghith A, Bruning JB, Bell SG. The oxidation of cholesterol derivatives by the CYP124 and CYP142 enzymes from Mycobacterium marinum. J Steroid Biochem Mol Biol 2023; 231:106317. [PMID: 37141947 DOI: 10.1016/j.jsbmb.2023.106317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 04/29/2023] [Accepted: 05/02/2023] [Indexed: 05/06/2023]
Abstract
The CYP124 and CYP142 families of bacterial cytochrome P450 monooxygenases (CYPs), catalyze the oxidation of methyl branched lipids, including cholesterol, as one of the initial activating steps in their catabolism. Both enzymes are reported to supplement the CYP125 family of P450 enzymes. These CYP125 enzymes are found in the same bacteria, and are the primary cholesterol/cholest-4-en-3-one metabolizing enzymes. To further understand the role of the CYP124 and CYP142 cytochrome P450s we investigated the Mycobacterium marinum enzymes, MmarCYP124A1 and CYP142A3, with various cholesterol analogues with modifications on the A and B rings of the steroid. We assessed the substrate binding and catalytic activity of each enzyme. Neither enzyme could bind or oxidize cholesteryl acetate or 3,5-cholestadiene, which have modifications at the C3 hydroxyl moiety of cholesterol. The CYP142 enzyme was better able to accommodate and oxidize cholesterol analogues which have changes on the A/B rings including cholesterol-5α,6α-epoxide and diastereomers of 5-cholestan-3-ol. The CYP124 enzyme was more tolerant of changes at C7 of the cholesterol B ring, e.g., 7-ketocholesterol than in the A ring. The selectivity for oxidation at the ω-carbon of a branched chain was observed in all steroids that were oxidized. The 7-ketocholesterol-bound MmarCYP124A1 enzyme from M. marinum, was structurally characterized by X-ray crystallography to 1.81Å resolution. The 7-ketocholesterol-bound X-ray crystal structure of the MmarCYP124A1 enzyme revealed that the substrate binding mode of this cholesterol derivative was altered compared to those observed with other non-steroidal ligands. The structure provided an explanation for the selectivity of the enzyme for terminal methyl hydroxylation.
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Affiliation(s)
- Amna Ghith
- Department of Chemistry, University of Adelaide, SA 5005, Australia
| | - John B Bruning
- School of Biological Sciences, University of Adelaide, SA 5005, Australia
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, SA 5005, Australia.
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29
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Ghith A, Bruning JB, Bell SG. The catalytic activity and structure of the lipid metabolizing CYP124 cytochrome P450 enzyme from Mycobacterium marinum. Arch Biochem Biophys 2023; 737:109554. [PMID: 36842492 DOI: 10.1016/j.abb.2023.109554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/22/2023] [Accepted: 02/23/2023] [Indexed: 02/28/2023]
Abstract
The CYP124 family of cytochrome P450 enzymes, as exemplified by CYP124A1 from Mycobacterium tuberculosis, is involved in the metabolism of methyl branched lipids and cholesterol derivatives. The equivalent enzyme from Mycobacterium marinum was investigated to compare the degree of functional conservation between members of this CYP family from closely related bacteria. We compared substrate binding of each CYP124 enzyme using UV-vis spectroscopy and the catalytic oxidation of methyl branched lipids, terpenes and cholesterol derivatives was investigated. The CYP124 enzyme from M. tuberculosis displayed a larger shift to the ferric high-spin state on binding cholesterol derivatives compared to the equivalent enzyme from M. marinum. The biggest difference was observed with cholesteryl sulfate which induced distinct UV-vis spectra in each CYP124 enzyme. The selectivity for oxidation at the ω-carbon of a branched chain was maintained for all substrates, except cholesteryl sulfate which was not oxidized by either enzyme. The CYP124A1 enzyme from M. marinum, in combination with farnesol and farnesyl acetate, was structurally characterized by X-ray crystallography. These ligand-bound structures of the CYP124 enzyme revealed that the polar component of the substrates bound in a different manner to that of phytanic acid in the structure of CYP124A1 from M. tuberculosis. However, closer to the heme the structures were similar providing an explanation for the high selectivity of the enzyme for terminal methyl C-H bond oxidation. The work here demonstrates that there were differences in the biochemistry of the CYP124 enzymes from these closely related bacteria.
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Affiliation(s)
- Amna Ghith
- Department of Chemistry, University of Adelaide, SA, 5005, Australia
| | - John B Bruning
- School of Biological Sciences, University of Adelaide, SA, 5005, Australia
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, SA, 5005, Australia.
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30
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Asai M, Li Y, Newton SM, Robertson BD, Langford PR. Galleria mellonella-intracellular bacteria pathogen infection models: the ins and outs. FEMS Microbiol Rev 2023; 47:fuad011. [PMID: 36906279 PMCID: PMC10045907 DOI: 10.1093/femsre/fuad011] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 03/13/2023] Open
Abstract
Galleria mellonella (greater wax moth) larvae are used widely as surrogate infectious disease models, due to ease of use and the presence of an innate immune system functionally similar to that of vertebrates. Here, we review G. mellonella-human intracellular bacteria pathogen infection models from the genera Burkholderia, Coxiella, Francisella, Listeria, and Mycobacterium. For all genera, G. mellonella use has increased understanding of host-bacterial interactive biology, particularly through studies comparing the virulence of closely related species and/or wild-type versus mutant pairs. In many cases, virulence in G. mellonella mirrors that found in mammalian infection models, although it is unclear whether the pathogenic mechanisms are the same. The use of G. mellonella larvae has speeded up in vivo efficacy and toxicity testing of novel antimicrobials to treat infections caused by intracellular bacteria: an area that will expand since the FDA no longer requires animal testing for licensure. Further use of G. mellonella-intracellular bacteria infection models will be driven by advances in G. mellonella genetics, imaging, metabolomics, proteomics, and transcriptomic methodologies, alongside the development and accessibility of reagents to quantify immune markers, all of which will be underpinned by a fully annotated genome.
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Affiliation(s)
- Masanori Asai
- Section of Paediatric Infectious Disease, Department of Infectious Disease, St Mary’s campus, Imperial College London, London W2 1PG, United Kingdom
| | - Yanwen Li
- Section of Paediatric Infectious Disease, Department of Infectious Disease, St Mary’s campus, Imperial College London, London W2 1PG, United Kingdom
| | - Sandra M Newton
- Section of Paediatric Infectious Disease, Department of Infectious Disease, St Mary’s campus, Imperial College London, London W2 1PG, United Kingdom
| | - Brian D Robertson
- Centre for Bacterial Resistance Biology, Department of Infectious Disease, South Kensington campus, Imperial College London, London SW7 2AZ, United Kingdom
| | - Paul R Langford
- Section of Paediatric Infectious Disease, Department of Infectious Disease, St Mary’s campus, Imperial College London, London W2 1PG, United Kingdom
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Banducci-Karp A, Xie J, Engels SAG, Sarantaris C, van Hage P, Varela M, Meijer AH, van der Vaart M. DRAM1 Promotes Lysosomal Delivery of Mycobacterium marinum in Macrophages. Cells 2023; 12:cells12060828. [PMID: 36980169 PMCID: PMC10047064 DOI: 10.3390/cells12060828] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 03/03/2023] [Accepted: 03/05/2023] [Indexed: 03/30/2023] Open
Abstract
Damage-Regulated Autophagy Modulator 1 (DRAM1) is an infection-inducible membrane protein, whose function in the immune response is incompletely understood. Based on previous results in a zebrafish infection model, we have proposed that DRAM1 is a host resistance factor against intracellular mycobacterial infection. To gain insight into the cellular processes underlying DRAM1-mediated host defence, here we studied the interaction of DRAM1 with Mycobacterium marinum in murine RAW264.7 macrophages. We found that, shortly after phagocytosis, DRAM1 localised in a punctate pattern to mycobacteria, which gradually progressed to full DRAM1 envelopment of the bacteria. Within the same time frame, DRAM1-positive mycobacteria colocalised with the LC3 marker for autophagosomes and LysoTracker and LAMP1 markers for (endo)lysosomes. Knockdown analysis revealed that DRAM1 is required for the recruitment of LC3 and for the acidification of mycobacteria-containing vesicles. A reduction in the presence of LAMP1 further suggested reduced fusion of lysosomes with mycobacteria-containing vesicles. Finally, we show that DRAM1 knockdown impairs the ability of macrophages to defend against mycobacterial infection. Together, these results support that DRAM1 promotes the trafficking of mycobacteria through the degradative (auto)phagolysosomal pathway. Considering its prominent effect on host resistance to intracellular infection, DRAM1 is a promising target for therapeutic modulation of the microbicidal capacity of macrophages.
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Affiliation(s)
- Adrianna Banducci-Karp
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Jiajun Xie
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Sem A G Engels
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Christos Sarantaris
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Patrick van Hage
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Monica Varela
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Annemarie H Meijer
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Michiel van der Vaart
- Institute of Biology Leiden, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
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The EspN transcription factor is an infection-dependent regulator of the ESX-1 system in M. marinum. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.02.15.528779. [PMID: 36824794 PMCID: PMC9948972 DOI: 10.1101/2023.02.15.528779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Bacterial pathogens use protein secretion systems to translocate virulence factors into the host and to control bacterial gene expression. The ESX-1 (ESAT-6 system 1) secretion system facilitates disruption of the macrophage phagosome during infection, enabling access to the cytoplasm, and regulates widespread gene expression in the mycobacterial cell. The transcription factors contributing to the ESX-1 transcriptional network during mycobacterial infection are not known. We showed that the EspM and WhiB6 transcription factors regulate the ESX-1 transcriptional network in vitro but are dispensable for macrophage infection by Mycobacterium marinum . In this study, we used our understanding of the ESX-1 system to identify EspN, a critical transcription factor that controls expression of the ESX-1 genes during infection, but whose effect is not detectable under standard laboratory growth conditions. Under laboratory conditions, EspN activity is masked by the EspM repressor. In the absence of EspM, we found that EspN is required for ESX-1 function because it activates expression of the whiB6 transcription factor gene, and specific ESX-1 substrate and secretory component genes. Unlike the other transcription factors that regulate ESX-1, EspN is required for M. marinum growth within and cytolysis of macrophages, and for disease burden in a zebrafish larval model of infection. These findings demonstrate that EspN is an infection-dependent regulator of the ESX-1 transcriptional network, which is essential for mycobacterial pathogenesis. Moreover, our findings suggest that ESX-1 expression is controlled by a genetic switch that responds to host specific signals. Importance Pathogenic mycobacteria cause acute and long-term diseases, including human tuberculosis. The ESX-1 system transports proteins that control the host response to infection and promotes bacterial survival. Although ESX-1 transports proteins, it also controls gene expression in the bacteria. In this study, we identify an undescribed transcription factor that controls the expression of ESX-1 genes, and is required for both macrophage and animal infection. However, this transcription factor is not the primary regulator of ESX-1 genes under standard laboratory conditions. These findings identify a critical transcription factor that controls expression of a major virulence pathway during infection, but whose effect is not detectable with standard laboratory strains and growth conditions.
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Harnessing Innate Immunity to Treat Mycobacterium tuberculosis Infections: Heat-Killed Caulobacter crescentus as a Novel Biotherapeutic. Cells 2023; 12:cells12040560. [PMID: 36831226 PMCID: PMC9954702 DOI: 10.3390/cells12040560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Revised: 01/29/2023] [Accepted: 02/02/2023] [Indexed: 02/12/2023] Open
Abstract
Tuberculosis, caused by Mycobacterium tuberculosis (Mtb), is a serious and devastating infectious disease worldwide. Approximately a quarter of the world population harbors latent Mtb infection without pathological consequences. Exposure of immunocompetent healthy individuals with Mtb does not result in active disease in more than 90% individuals, suggesting a defining role of host immunity to prevent and/or clear early infection. However, innate immune stimulation strategies have been relatively underexplored for the treatment of tuberculosis. In this study, we used cell culture and mouse models to examine the role of a heat-killed form of a non-pathogenic microbe, Caulobacter crescentus (HKCC), in inducing innate immunity and limiting Mtb infection. We also examined the added benefits of a distinct chemo-immunotherapeutic strategy that incorporates concurrent treatments with low doses of a first-line drug isoniazid and HKCC. This therapeutic approach resulted in highly significant reductions in disseminated Mtb in the lungs, liver, and spleen of mice compared to either agent alone. Our studies demonstrate the potential of a novel innate immunotherapeutic strategy with or without antimycobacterial drugs in controlling Mtb infection in mice and open new avenues for the treatment of tuberculosis in humans.
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Sparks IL, Derbyshire KM, Jacobs WR, Morita YS. Mycobacterium smegmatis: The Vanguard of Mycobacterial Research. J Bacteriol 2023; 205:e0033722. [PMID: 36598232 PMCID: PMC9879119 DOI: 10.1128/jb.00337-22] [Citation(s) in RCA: 23] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
The genus Mycobacterium contains several slow-growing human pathogens, including Mycobacterium tuberculosis, Mycobacterium leprae, and Mycobacterium avium. Mycobacterium smegmatis is a nonpathogenic and fast growing species within this genus. In 1990, a mutant of M. smegmatis, designated mc2155, that could be transformed with episomal plasmids was isolated, elevating M. smegmatis to model status as the ideal surrogate for mycobacterial research. Classical bacterial models, such as Escherichia coli, were inadequate for mycobacteria research because they have low genetic conservation, different physiology, and lack the novel envelope structure that distinguishes the Mycobacterium genus. By contrast, M. smegmatis encodes thousands of conserved mycobacterial gene orthologs and has the same cell architecture and physiology. Dissection and characterization of conserved genes, structures, and processes in genetically tractable M. smegmatis mc2155 have since provided previously unattainable insights on these same features in its slow-growing relatives. Notably, tuberculosis (TB) drugs, including the first-line drugs isoniazid and ethambutol, are active against M. smegmatis, but not against E. coli, allowing the identification of their physiological targets. Furthermore, Bedaquiline, the first new TB drug in 40 years, was discovered through an M. smegmatis screen. M. smegmatis has become a model bacterium, not only for M. tuberculosis, but for all other Mycobacterium species and related genera. With a repertoire of bioinformatic and physical resources, including the recently established Mycobacterial Systems Resource, M. smegmatis will continue to accelerate mycobacterial research and advance the field of microbiology.
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Affiliation(s)
- Ian L. Sparks
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, USA
| | - Keith M. Derbyshire
- Division of Genetics, Wadsworth Center, New York State Department of Health, Albany, New York, USA
- Department of Biomedical Sciences, University at Albany, Albany, New York, USA
| | - William R. Jacobs
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - Yasu S. Morita
- Department of Microbiology, University of Massachusetts, Amherst, Massachusetts, USA
- Molecular and Cellular Biology Graduate Program, University of Massachusetts, Amherst, Massachusetts, USA
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Lienard J, Munke K, Carlsson F. A Murine Mycobacterium marinum Infection Model for Longitudinal Analyses of Disease Development and the Inflammatory Response. Methods Mol Biol 2023; 2674:313-326. [PMID: 37258977 DOI: 10.1007/978-1-0716-3243-7_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Mycobacterial infections, including tuberculosis, are a major health problem globally. Prevention and treatments of tuberculosis are challenging due to the poor efficacy of the current vaccine and the emergence of drug-resistant strains. Therefore, it is critical to increase our basic understanding of mycobacterial virulence strategies as well as the host immune response during infection in the complex in vivo setting. While existing infection models provide valuable tools for investigating mycobacterial pathogenesis, they also exhibit limitations that can be addressed by the development of complementary models. Here we describe recent advances to the murine Mycobacterium marinum infection model, in which the bacteria produce a local infection restricted to the tail tissue. The M. marinum model has the advantage of mimicking some of the key hallmarks of human tuberculosis not replicated in the conventional murine Mycobacterium tuberculosis model, such as the formation of granulomas with central caseating necrosis and the spontaneous development of a latency-like stage. Moreover, the model is non-lethal and enables longitudinal analysis of disease development in live animals. In this chapter, we report protocols to prepare infected tissue samples for detailed and quantitative analysis of the immune response by flow cytometry, immunofluorescence microscopy, RT-qPCR, ELISA, and Western blot, as well as for the analysis of bacterial load and localization.
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Affiliation(s)
- Julia Lienard
- Department of Biology, Faculty of Science, Lund University, Lund, Sweden.
| | - Kristina Munke
- Department of Experimental Medical Science, Faculty of Medicine, Lund University, Lund, Sweden
| | - Fredric Carlsson
- Department of Biology, Faculty of Science, Lund University, Lund, Sweden
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36
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Functional Analysis of EspM, an ESX-1-Associated Transcription Factor in Mycobacterium marinum. J Bacteriol 2022; 204:e0023322. [PMID: 36448785 PMCID: PMC9765225 DOI: 10.1128/jb.00233-22] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Pathogenic mycobacteria use the ESX-1 secretion system to escape the macrophage phagosome and survive infection. We demonstrated that the ESX-1 system is regulated by feedback control in Mycobacterium marinum, a nontuberculous pathogen and model for the human pathogen Mycobacterium tuberculosis. In the presence of a functional ESX-1 system, the WhiB6 transcription factor upregulates expression of ESX-1 substrate genes. In the absence of an assembled ESX-1 system, the conserved transcription factor, EspM, represses whiB6 expression by specifically binding the whiB6 promoter. Together, WhiB6 and EspM fine-tune the levels of ESX-1 substrates in response to the secretion system. The mechanisms underlying control of the ESX-1 system by EspM are unknown. Here, we conduct a structure and function analysis to investigate how EspM is regulated. Using biochemical approaches, we measured the formation of higher-order oligomers of EspM in vitro. We demonstrate that multimerization in vitro can be mediated through multiple domains of the EspM protein. Using a bacterial monohybrid system, we showed that EspM self-associates through multiple domains in Escherichia coli. Using this system, we performed a genetic screen to identify EspM variants that failed to self-associate. The screen yielded four EspM variants of interest, which we tested for activity in M. marinum. Our study revealed that the two helix-turn-helix domains are functionally distinct. Moreover, the helix bundle domain is required for wild-type multimerization in vitro. Our data support models where EspM monomers or hexamers contribute to the regulation of whiB6 expression. IMPORTANCE Pathogenic mycobacteria are bacteria that pose a large burden to human health globally. The ESX-1 secretion system is required for pathogenic mycobacteria to survive within and interact with the host. Proper function of the ESX-1 secretion system is achieved by tightly controlling the expression of secreted virulence factors, in part through transcriptional regulation. Here, we characterize the conserved transcription factor EspM, which regulates the expression of ESX-1 virulence factors. We define domains required for EspM to form multimers and bind DNA. These findings provide an initial characterization an ESX-1 transcription factor and provide insights into its mechanism of action.
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MDN-6, a Possible Therapeutic Candidate for Multidrug-Resistant and Extensively Drug-Resistant Mycobacterium tuberculosis. Jundishapur J Microbiol 2022. [DOI: 10.5812/jjm-129482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Background: The rise of antibiotic-resistant Mycobacterium tuberculosis strains has accelerated the hunt for novel drugs for tuberculosis (TB). Objectives: This study identified a novel compound with strong anti-TB efficacy against several resistant M. tuberculosis strains from a chemical library of naphthoquinone derivatives. Methods: The identified chemical was designated as MDN-6 (methyl-1,4-bis(2-(diethylamino)ethoxy)-2-naphthoate). Results: It significantly inhibited all the tested Mycobacterium strains, including 24 clinically isolated resistant strains. The minimum inhibitory concentrations of MDN-6 were between 0.02 and 25 g/mL. It also had partially synergistic activity against extensively drug-resistant M. tuberculosis when coupled with rifampicin and streptomycin. Additionally, MDN-6 demonstrated a superior post-antibiotic effect over isoniazid and exhibited comparable inhibitory efficacy against Mycobacterium marinum and Mycobacterium kansasii. Besides the antimicrobial effect, MDN-6 had a 50% lethal dosage (LD50) of 279.1 mg/kg in female BALB/c mice. Conclusions: MDN-6 is a promising anti-TB therapeutic candidate against drug-resistant M. tuberculosis. However, further investigation is necessary to elucidate the action mechanism and assess the drug’s in vivo therapeutic potential.
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38
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Ghith A, Doherty DZ, Bruning JB, Russell RA, De Voss JJ, Bell SG. The Structures of the Steroid Binding CYP142 Cytochrome P450 Enzymes from Mycobacterium ulcerans and Mycobacterium marinum. ACS Infect Dis 2022; 8:1606-1617. [PMID: 35881654 DOI: 10.1021/acsinfecdis.2c00215] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The steroid binding CYP142 cytochrome P450 enzymes of Mycobacterium species are involved in the metabolism of cholesterol and its derivatives. The equivalent enzyme from Mycobacterium ulcerans was studied to compare the degree of functional conservation between members of this CYP family. We compared substrate binding of the CYP142A3 enzymes of M. ulcerans and M. marinum and CYP142A1 from M. tuberculosis using UV-vis spectroscopy. The catalytic oxidation of cholesterol derivatives by all three enzymes was undertaken. Both CYP142A3 enzymes were structurally characterized by X-ray crystallography. The amino acid sequences of the CYP142A3 enzymes are more similar to CYP142A1 from M. tuberculosis than CYP142A2 from Mycolicibacterium smegmatis. Both CYP142A3 enzymes have substrate binding properties, which are more resemblant to CYP142A1 than CYP142A2. The cholest-4-en-3-one-bound X-ray crystal structure of both CYP142A3 enzymes were determined at a resolution of <1.8 Å, revealing the substrate binding mode at a high level of detail. The structures of the cholest-4-en-3-one binding CYP142 enzymes from M. ulcerans and M. marinum demonstrate how the steroid binds in the active site of these enzymes. They provide an explanation for the high selectivity of the enzyme for terminal methyl C-H bond oxidation to form 26-hydroxy derivatives. These enzymes in pathogenic Mycobacterium species are candidates for inhibition. The work here demonstrates that similar drug molecules could target these CYP142 enzymes from different species in order to combat Buruli ulcer or tuberculosis.
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Affiliation(s)
- Amna Ghith
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - Daniel Z Doherty
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
| | - John B Bruning
- School of Biological Sciences, University of Adelaide, Adelaide, SA 5005, Australia
| | - Robert A Russell
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, Sydney, NSW 2234, Australia
| | - James J De Voss
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD 4072, Australia
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, Adelaide, SA 5005, Australia
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Mohamed H, Child SA, Bruning JB, Bell SG. A comparison of the bacterial CYP51 cytochrome P450 enzymes from Mycobacterium marinum and Mycobacterium tuberculosis. J Steroid Biochem Mol Biol 2022; 221:106097. [PMID: 35346833 DOI: 10.1016/j.jsbmb.2022.106097] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/07/2022] [Accepted: 03/16/2022] [Indexed: 12/15/2022]
Abstract
Members of the CYP51 family of cytochrome P450 enzymes are classified as sterol demethylases involved in the metabolic formation of cholesterol and related derivatives. The CYP51 enzyme from Mycobacterium marinum was studied and compared to its counterpart from Mycobacterium tuberculosis to determine the degree of functional conservation between them. Spectroscopic analyses of substrate and inhibitor binding of the purified CYP51 enzymes from M. marinum and M. tuberculosis were performed. The catalytic oxidation of lanosterol and related steroids was investigated. M. marinum CYP51 was structurally characterized by X-ray crystallography. The CYP51 enzyme of M. marinum is sequentially closely related to CYP51B1 from M. tuberculosis. However, differences in the heme spin state of each enzyme were observed upon the addition of steroids and other ligands. Both enzymes displayed different binding properties to those reported for the CYP51-Fdx fusion protein from the bacterium Methylococcus capsulatus. The enzymes were able to oxidatively demethylate lanosterol to generate 14-demethylanosterol, but no products were detected for the related species dihydrolanosterol and eburicol. The crystal structure of CYP51 from M. marinum in the absence of added substrate but with a Bis-Tris molecule within the active site was resolved. The CYP51 enzyme of M. marinum displays differences in how steroids and other ligands bind compared to the M. tuberculosis enzyme. This was related to structural differences between the two enzymes. Overall, both of these CYP51 enzymes from mycobacterial species displayed significant differences to the CYP51 enzymes of eukaryotic species and the bacterial CYP51-Fdx enzyme of Me. capsulatus.
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Affiliation(s)
| | - Stella A Child
- Department of Chemistry, University of Adelaide, SA 5005, Australia
| | - John B Bruning
- School of Biological Sciences, University of Adelaide, SA 5005, Australia
| | - Stephen G Bell
- Department of Chemistry, University of Adelaide, SA 5005, Australia.
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40
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Hill NS, Welch MD. A glycine-rich PE_PGRS protein governs mycobacterial actin-based motility. Nat Commun 2022; 13:3608. [PMID: 35750685 PMCID: PMC9232537 DOI: 10.1038/s41467-022-31333-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 06/14/2022] [Indexed: 11/09/2022] Open
Abstract
Many key insights into actin regulation have been derived through examining how microbial pathogens intercept the actin cytoskeleton during infection. Mycobacterium marinum, a close relative of the human pathogen Mycobacterium tuberculosis, polymerizes host actin at the bacterial surface to drive intracellular movement and cell-to-cell spread during infection. However, the mycobacterial factor that commandeers actin polymerization has remained elusive. Here, we report the identification and characterization of the M. marinum actin-based motility factor designated mycobacterial intracellular rockets A (MirA), which is a member of the glycine-rich PE_PGRS protein family. MirA contains an amphipathic helix to anchor into the mycobacterial outer membrane and, surprisingly, also the surface of host lipid droplet organelles. MirA directly binds to and activates the host protein N-WASP to stimulate actin polymerization through the Arp2/3 complex, directing both bacterial and lipid droplet actin-based motility. MirA is dissimilar to known N-WASP activating ligands and may represent a new class of microbial and host actin regulator. Additionally, the MirA-N-WASP interaction represents a model to understand how the enigmatic PE_PGRS proteins contribute to mycobacterial pathogenesis.
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Affiliation(s)
- Norbert S Hill
- Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.
| | - Matthew D Welch
- Department of Molecular and Cell Biology, University of California, Berkeley, CA, USA.
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Cronin RM, Ferrell MJ, Cahir CW, Champion MM, Champion PA. Proteo-genetic analysis reveals clear hierarchy of ESX-1 secretion in Mycobacterium marinum. Proc Natl Acad Sci U S A 2022; 119:e2123100119. [PMID: 35671426 PMCID: PMC9214503 DOI: 10.1073/pnas.2123100119] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 05/06/2022] [Indexed: 12/14/2022] Open
Abstract
The ESX-1 (ESAT-6-system-1) system and the protein substrates it transports are essential for mycobacterial pathogenesis. The precise ways that ESX-1 substrates contribute to virulence remains unknown. Several known ESX-1 substrates are also required for the secretion of other proteins. We used a proteo-genetic approach to construct high-resolution dependency relationships for the roles of individual ESX-1 substrates in secretion and virulence in Mycobacterium marinum, a pathogen of humans and animals. Characterizing a collection of M. marinum strains with in-frame deletions in each of the known ESX-1 substrate genes and the corresponding complementation strains, we demonstrate that ESX-1 substrates are differentially required for ESX-1 activity and for virulence. Using isobaric-tagged proteomics, we quantified the degree of requirement of each substrate on protein secretion. We conclusively defined distinct contributions of ESX-1 substrates in protein secretion. Our data reveal a hierarchy of ESX-1 substrate secretion, which supports a model for the composition of the extracytoplasmic ESX-1 secretory machinery. Overall, our proteo-genetic analysis demonstrates discrete roles for ESX-1 substrates in ESX-1 function and secretion in M. marinum.
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Affiliation(s)
- Rachel M. Cronin
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
| | - Micah J. Ferrell
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
| | - Clare W. Cahir
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
| | - Matthew M. Champion
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556
| | - Patricia A. Champion
- Department of Biological Sciences, University of Notre Dame, Notre Dame, IN 46556
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Rodriguez C, Vega IA, Castro-Vazquez A. A Dissenters' View on AppleSnail Immunobiology. Front Immunol 2022; 13:879122. [PMID: 35693764 PMCID: PMC9178244 DOI: 10.3389/fimmu.2022.879122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
We stand as dissenters against the acceptance of scientific knowledge that has not been built on empirical data. With this in mind, this review synthesizes selected aspects of the immunobiology of gastropods and of apple snails (Ampullariidae) in particular, from morphological to molecular and "omics" studies. Our trip went through more than two centuries of history and was guided by an evo-devo hypothesis: that the gastropod immune system originally developed in the mesenchymal connective tissue of the reno-pericardial complex, and that in that tissue some cells differentiated into hematopoietically committed progenitor cells that integrate constitutive hemocyte aggregations in the reno-pericardial territory, whether concentrated in the pericardium or the kidney in a species-specific manner. However, some of them may be freed from those aggregations, circulate in the blood, and form distant contingent aggregations anywhere in the body, but always in response to intruders (i.e., pathogens or any other immune challenge). After that, we reviewed the incipient immunology of the Ampullariidae by critically revising the findings in Pomacea canaliculata and Marisa cornuarietis, the only ampullariid species that have been studied in this respect, and we attempted to identify the effectors and the processes in which they are involved. Particularly for P. canaliculata, which is by far the most studied species, we ask which hemocytes are involved, in which tissues or organs are integrated, and what cellular reactions to intruders this species has in common with other animals. Furthermore, we wondered what humoral factors could also integrate its internal defense system. Among the cellular defenses, we give an outstanding position to the generation of hemocyte nodules, which seems to be an important process for these snails, serving the isolation and elimination of intruders. Finally, we discuss hematopoiesis in apple snails. There have been contrasting views about some of these aspects, but we envision a hematopoietic system centered in the constitutive hemocyte islets in the ampullariid kidney.
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Affiliation(s)
- Cristian Rodriguez
- IHEM, CONICET, Universidad Nacional de Cuyo, Mendoza, Argentina
- Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Israel A. Vega
- IHEM, CONICET, Universidad Nacional de Cuyo, Mendoza, Argentina
- Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
| | - Alfredo Castro-Vazquez
- IHEM, CONICET, Universidad Nacional de Cuyo, Mendoza, Argentina
- Departamento de Biología, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza, Argentina
- Instituto de Fisiología, Facultad de Ciencias Médicas, Universidad Nacional de Cuyo, Mendoza, Argentina
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Narendrakumar L, Sudhagar A, Preena PG, Nithianantham SR, Mohandas SP, Swaminathan TR. Detection of Mycobacterium marinum and multidrug-resistant bacteria in a chronic progressive disease outbreak among Siamese fighting fish (Betta splendens) in India. Biologia (Bratisl) 2022. [DOI: 10.1007/s11756-022-01118-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Song J, Chao J, Hu X, Wen X, Ding C, Li D, Zhang D, Han S, Yu X, Yan B, Jin Z, Song Y, Gonzales J, Via LE, Zhang L, Wang D. E3 Ligase FBXW7 Facilitates Mycobacterium Immune Evasion by Modulating TNF-α Expression. Front Cell Infect Microbiol 2022; 12:851197. [PMID: 35651754 PMCID: PMC9149249 DOI: 10.3389/fcimb.2022.851197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2022] [Accepted: 03/24/2022] [Indexed: 11/26/2022] Open
Abstract
Tumor necrosis factor alpha (TNF-α) is a crucial factor in the control of Mycobacterium tuberculosis (Mtb) infection. Pathogenic mycobacteria can inhibit and/or regulate host cell TNF-α production in a variety of ways to evade antituberculosis (anti-TB) immunity as well as facilitate immune escape. However, the mechanisms by which TNF-α expression in host cells is modulated to the benefit of mycobacteria is still an interesting topic and needs further study. Here, we report that macrophages infected with Mycobacterium marinum (Mm)—a close relative of Mtb—upregulated the expression of E3 ubiquitin ligase FBXW7. Specific silencing FBXW7 with small interfering RNA (siRNA) significantly elevates TNF-α expression and eventually promotes the elimination of intracellular bacteria. In turn, overexpression of FBXW7 in Raw264.7 macrophages markedly decreased TNF-α production. Furthermore, partial inhibition of FBXW7 in an Mm-infected murine model significantly reduced TNF-α tissue content, alleviated tissue damage as well as reduced the bacterial load of mouse tails. Finally, FBXW7 could decrease TNF-α in a K63-linked ubiquitin signaling dependent manner. Taken together, our study uncovered a previously unknown role of FBXW7 in regulating TNF-α dynamics during mycobacterial infection, which provides new insights into understanding the role of FBXW7 in anti-tuberculosis immunity and its related clinical significance.
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Affiliation(s)
- Jingrui Song
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Jin Chao
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Xiaohong Hu
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Department of Tuberculosis, The Third People’s Hospital of Yichang, Yichang, China
| | - Xin Wen
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Cairong Ding
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Dan Li
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Department of Tuberculosis, The Third People’s Hospital of Yichang, Yichang, China
| | - Ding Zhang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
- Department of Pathology, Yichang Central People’s Hospital, Yichang, China
| | - Shanshan Han
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Xiang Yu
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Bo Yan
- Shanghai Public Health Clinical Center, Fudan University, Shanghai, China
| | - Zhu Jin
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Department of Tuberculosis, The Third People’s Hospital of Yichang, Yichang, China
| | - Yinhong Song
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
| | - Jacqueline Gonzales
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, and Tuberculosis Imaging Program, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Laura E. Via
- Tuberculosis Research Section, Laboratory of Clinical Immunology and Microbiology, and Tuberculosis Imaging Program, Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
- Institute of Infectious Disease and Molecular Medicine, University of Cape Town, Cape Town, South Africa
| | - Lu Zhang
- Engineering Research Center of Gene Technology, Ministry of Education, Department of Microbiology, School of Life Science, Fudan University, Shanghai, China
- *Correspondence: Lu Zhang, ; Decheng Wang,
| | - Decheng Wang
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University, Yichang, China
- Institute of Infection and Inflammation, China Three Gorges University, Yichang, China
- Medical College, China Three Gorges University, Yichang, China
- *Correspondence: Lu Zhang, ; Decheng Wang,
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Design, synthesis and antibacterial activity against pathogenic mycobacteria of conjugated hydroxamic acids, hydrazides and O-alkyl/O-acyl protected hydroxamic derivatives. Bioorg Med Chem Lett 2022; 64:128692. [PMID: 35307568 DOI: 10.1016/j.bmcl.2022.128692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2021] [Revised: 03/04/2022] [Accepted: 03/15/2022] [Indexed: 11/22/2022]
Abstract
With the aim to discover new antituberculous molecules, three novel series of 23 hydroxamic acids, 13 hydrazides, and 9O-alkyl/O-acyl protected hydroxamic acid derivatives have been synthesized, and fully characterized by spectral 1H NMR, 13C NMR, HRMS) analysis. These compounds were further biologically screened for their in vitro antibacterial activities against three pathogenic mycobacteria - M. abscessus S and R, M. marinum, and M. tuberculosis - as well as for their toxicity towards murine macrophages by the resazurin microtiter assay (REMA). Among the 45 derivatives, 17 compounds (3 hydroxamic acids, 9 hydrazides, and 5O-alkyl/O-acyl protected hydroxamic acids) were nontoxic against murine macrophages. When tested for their antibacterial activity, hydroxamic acid 9 h was found to be the most potent inhibitor against M. abscessus S and R only. Regarding hydrazide series, only 7h was active against M. abscessus R, M. marinum and M. tuberculosis; while the O-acyl protected hydroxamic acid derivatives 14d and 15d displayed promising antibacterial activity against both M. marinum and M. tuberculosis. Since such hydroxamic- and hydrazide-chelating groups have been reported to impair the activity of the peptide deformylase, in silico molecular docking studies in M. tuberculosis peptide deformylase enzyme active site were further performed with 7h in order to predict the possible interaction mode and binding energy of this molecule at the molecular level.
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46
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Orujyan D, Narinyan W, Rangarajan S, Rangchaikul P, Prasad C, Saviola B, Venketaraman V. Protective Efficacy of BCG Vaccine against Mycobacterium leprae and Non-Tuberculous Mycobacterial Infections. Vaccines (Basel) 2022; 10:vaccines10030390. [PMID: 35335022 PMCID: PMC8952781 DOI: 10.3390/vaccines10030390] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 02/16/2022] [Accepted: 03/02/2022] [Indexed: 02/06/2023] Open
Abstract
The genus mycobacterium includes several species that are known to cause infections in humans. The microorganisms are classified into tuberculous and non-tuberculous based on their morphological characteristics, defined by the dynamic relationship between the host defenses and the infectious agent. Non-tuberculous mycobacteria (NTM) include all the species of mycobacterium other than the ones that cause tuberculosis (TB). The group of NTM contains almost 200 different species and they are found in soil, water, animals—both domestic and wild—milk and food products, and from plumbed water resources such as sewers and showerhead sprays. A systematic review of Medline between 1946 and 2014 showed an 81% decline in TB incidence rates with a simultaneous 94% increase in infections caused by NTM. Prevalence of infections due to NTM has increased relative to infections caused by TB owing to the stringent prevention and control programs in Western countries such as the USA and Canada. While the spread of typical mycobacterial infections such as TB and leprosy involves human contact, NTM seem to spread easily from the environment without the risk of acquiring from a human contact except in the case of M. abscessus in patients with cystic fibrosis, where human transmission as well as transmission through fomites and aerosols has been recorded. NTM are opportunistic in their infectious processes, making immunocompromised individuals such as those with other systemic infections such as HIV, immunodeficiencies, pulmonary disease, or usage of medications such as long-term corticosteroids/TNF-α inhibitors more susceptible. This review provides insight on pathogenesis, treatment, and BCG vaccine efficacy against M. leprae and some important NTM infections.
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Đorđević S, Gonzalez MM, Conejos-Sánchez I, Carreira B, Pozzi S, Acúrcio RC, Satchi-Fainaro R, Florindo HF, Vicent MJ. Current hurdles to the translation of nanomedicines from bench to the clinic. Drug Deliv Transl Res 2022; 12:500-525. [PMID: 34302274 PMCID: PMC8300981 DOI: 10.1007/s13346-021-01024-2] [Citation(s) in RCA: 91] [Impact Index Per Article: 45.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2021] [Indexed: 02/07/2023]
Abstract
The field of nanomedicine has significantly influenced research areas such as drug delivery, diagnostics, theranostics, and regenerative medicine; however, the further development of this field will face significant challenges at the regulatory level if related guidance remains unclear and unconsolidated. This review describes those features and pathways crucial to the clinical translation of nanomedicine and highlights considerations for early-stage product development. These include identifying those critical quality attributes of the drug product essential for activity and safety, appropriate analytical methods (physical, chemical, biological) for characterization, important process parameters, and adequate pre-clinical models. Additional concerns include the evaluation of batch-to-batch consistency and considerations regarding scaling up that will ensure a successful reproducible manufacturing process. Furthermore, we advise close collaboration with regulatory agencies from the early stages of development to assure an aligned position to accelerate the development of future nanomedicines.
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Affiliation(s)
- Snežana Đorđević
- Polymer Therapeutics Laboratory, Prince Felipe Research Center (CIPF), Eduardo Primo Yúfera 3, 46012, Valencia, Av, Spain
| | - María Medel Gonzalez
- Polymer Therapeutics Laboratory, Prince Felipe Research Center (CIPF), Eduardo Primo Yúfera 3, 46012, Valencia, Av, Spain
| | - Inmaculada Conejos-Sánchez
- Polymer Therapeutics Laboratory, Prince Felipe Research Center (CIPF), Eduardo Primo Yúfera 3, 46012, Valencia, Av, Spain
| | - Barbara Carreira
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003, Lisboa, Portugal
| | - Sabina Pozzi
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978, Tel Aviv, Israel
| | - Rita C Acúrcio
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003, Lisboa, Portugal
| | - Ronit Satchi-Fainaro
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978, Tel Aviv, Israel.
- Sagol School of Neuroscience, Tel Aviv University, 69978, Tel Aviv, Israel.
| | - Helena F Florindo
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Professor Gama Pinto, 1649-003, Lisboa, Portugal.
| | - María J Vicent
- Polymer Therapeutics Laboratory, Prince Felipe Research Center (CIPF), Eduardo Primo Yúfera 3, 46012, Valencia, Av, Spain.
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Shin S, Kwon S, Yeo Y. Meta-Analysis of Drug Delivery Approaches for Treating Intracellular Infections. Pharm Res 2022; 39:1085-1114. [PMID: 35146592 PMCID: PMC8830998 DOI: 10.1007/s11095-022-03188-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 02/01/2022] [Indexed: 12/20/2022]
Abstract
This meta-analysis aims to evaluate the trend, methodological quality and completeness of studies on intracellular delivery of antimicrobial agents. PubMed, Embase, and reference lists of related reviews were searched to identify original articles that evaluated carrier-mediated intracellular delivery and pharmacodynamics (PD) of antimicrobial therapeutics against intracellular pathogens in vitro and/or in vivo. A total of 99 studies were included in the analysis. The most commonly targeted intracellular pathogens were bacteria (62.6%), followed by viruses (16.2%) and parasites (15.2%). Twenty-one out of 99 (21.2%) studies performed neither microscopic imaging nor flow cytometric analysis to verify that the carrier particles are present in the infected cells. Only 31.3% of studies provided comparative inhibitory concentrations against a free drug control. Approximately 8% of studies, albeit claimed for intracellular delivery of antimicrobial therapeutics, did not provide any experimental data such as microscopic imaging, flow cytometry, and in vitro PD. Future research on intracellular delivery of antimicrobial agents needs to improve the methodological quality and completeness of supporting data in order to facilitate clinical translation of intracellular delivery platforms for antimicrobial therapeutics.
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Affiliation(s)
- Sooyoung Shin
- College of Pharmacy, Ajou University, Suwon, Gyeonggi-do, 16499, Republic of Korea. .,Research Institute of Pharmaceutical Science and Technology (RIPST), Ajou University, Suwon, Gyeonggi-do, 16499, Republic of Korea.
| | - Soonbum Kwon
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Dr., West Lafayette, IN, 47906, USA
| | - Yoon Yeo
- Department of Industrial and Physical Pharmacy, College of Pharmacy, Purdue University, 575 Stadium Mall Dr., West Lafayette, IN, 47906, USA. .,Weldon School of Biomedical Engineering, Purdue University, 206 S Martin Jischke Dr., West Lafayette, IN, 47907, USA.
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49
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Wang Y, Tang Y, Lin C, Zhang J, Mai J, Jiang J, Gao X, Li Y, Zhao G, Zhang L, Liu J. Crosstalk between the ancestral type VII secretion system ESX-4 and other T7SS in Mycobacterium marinum. iScience 2022; 25:103585. [PMID: 35005535 PMCID: PMC8718981 DOI: 10.1016/j.isci.2021.103585] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 10/30/2021] [Accepted: 12/06/2021] [Indexed: 12/13/2022] Open
Abstract
The type VII secretion system (T7SS) of Mycobacterium tuberculosis secretes three substrate classes: Esx, Esp, and PE/PPE proteins, that play important roles in bacterial physiology and host interaction. Five subtypes of T7SS, namely ESX-1 to ESX-5, are present in M. tb. ESX-4 is the progenitor of T7SS but its function is not understood. We investigated the ESX-4 system in Mycobacterium marinum. We show that ESX-4 of M. marinum does not secrete its cognate substrates, EsxT and EsxU, under the conditions tested. Paradoxically, the deletion of eccC4, an essential component of ESX-4, resulted in elevated secretion of protein substrates of ESX-1 and ESX-5. Consequently, the ΔeccC4 mutant was more efficient in inducing actin cytoskeleton rearrangement, which led to enhanced phagocytosis by macrophages. Our results reveal an intimate crosstalk between the progenitor of T7SS and its more recent duplication and expansion, and provide new insight into the evolution of T7SS in mycobacteria.
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Affiliation(s)
- Yuchen Wang
- Department of Microbiology, School of Life Science, Fudan University, Shanghai 200090, China.,Guizhou institute of Biotechnology, Guiyang 550025, Guizhou, China
| | - Yuting Tang
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Chen Lin
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Junli Zhang
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Juntao Mai
- Department of Molecular Genetics, University of Toronto, Toronto, ON M5G1M1, Canada
| | - Jun Jiang
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Xiaoxiao Gao
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Yao Li
- State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China
| | - Guoping Zhao
- Department of Microbiology, School of Life Science, Fudan University, Shanghai 200090, China
| | - Lu Zhang
- Department of Microbiology, School of Life Science, Fudan University, Shanghai 200090, China.,State Key Laboratory of Genetic Engineering, School of Life Science, Institute of Genetics, Fudan University, Shanghai 200090, China.,Shanghai Engineering Research Center of Industrial Microorganisms, Shanghai 200090, China
| | - Jun Liu
- Department of Molecular Genetics, University of Toronto, Toronto, ON M5G1M1, Canada
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50
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Knudsen Dal NJ, Speth M, Johann K, Barz M, Beauvineau C, Wohlmann J, Fenaroli F, Gicquel B, Griffiths G, Alonso-Rodriguez N. The zebrafish embryo as an in vivo model for screening nanoparticle-formulated lipophilic anti-tuberculosis compounds. Dis Model Mech 2022; 15:dmm049147. [PMID: 34842273 PMCID: PMC8807572 DOI: 10.1242/dmm.049147] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 11/16/2021] [Indexed: 11/20/2022] Open
Abstract
With the increasing emergence of drug-resistant Mycobacterium tuberculosis strains, new and effective antibiotics against tuberculosis (TB) are urgently needed. However, the high frequency of poorly water-soluble compounds among hits in high-throughput drug screening campaigns is a major obstacle in drug discovery. Moreover, in vivo testing using conventional animal TB models, such as mice, is time consuming and costly, and represents a major bottleneck in lead compound discovery and development. Here, we report the use of the zebrafish embryo TB model for evaluating the in vivo toxicity and efficacy of five poorly water-soluble nitronaphthofuran derivatives, which were recently identified as possessing anti-TB activity in vitro. To aid solubilization, compounds were formulated in biocompatible polymeric micelles (PMs). Three of the five PM-formulated nitronaphthofuran derivatives showed low toxicity in vivo, significantly reduced bacterial burden and improved survival in infected zebrafish embryos. We propose the zebrafish embryo TB-model as a quick and sensitive tool for evaluating the in vivo toxicity and efficacy of new anti-TB compounds during early stages of drug development. Thus, this model is well suited for pinpointing promising compounds for further development.
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Affiliation(s)
- Nils-Jørgen Knudsen Dal
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
| | - Martin Speth
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
| | - Kerstin Johann
- Department of Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
| | - Matthias Barz
- Department of Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
- Division of BioTherapeutics, Leiden Academic Center for Drug Research (LACDR), Leiden University, 2333 Leiden, The Netherlands
| | - Claire Beauvineau
- Chemical Library Institut Curie/CNRS, CNRS UMR9187, INSERM U1196 and CNRS UMR3666, INSERM U1193, Université Paris-Saclay, F-91405 Orsay, France
| | - Jens Wohlmann
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
| | - Federico Fenaroli
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
| | - Brigitte Gicquel
- Unité de Génétique Mycobactérienne, Dep Génomes and Génétique, Institute Pasteur, 75015 Paris, France
- Department of Tuberculosis Control and Prevention, Shenzhen Nanshan Center for Chronic Disease Control, 518054 Shenzhen, China
| | - Gareth Griffiths
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
| | - Noelia Alonso-Rodriguez
- Department Biosciences, Faculty of Mathematics and Natural Sciences, University of Oslo, 0371 Oslo, Norway
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