Tuberculosis: Immunopathogenesis and Therapeutic Strategies

A special issue of Biomolecules (ISSN 2218-273X). This special issue belongs to the section "Molecular Medicine".

Deadline for manuscript submissions: 15 September 2024 | Viewed by 2158

Special Issue Editors


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Guest Editor
Karolinska Institutet, ANA Futura, Department of Medicine Huddinge, Center for Infectious Medicine (CIM), Stockholm, Sweden
Interests: tuberculosis; immune responses; human; pathogenesis; host-directed therapy
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Guest Editor
Lund University, Division of Microbiology, Immunology and Glycobiology—MIG, Lund, Sweden
Interests: tuberculosis treatment; pathogenesis; infectious diseases; antimicrobials

Special Issue Information

Dear Colleagues,

Tuberculosis (TB) is the ninth leading cause of death worldwide, and every 20 seconds a person dies from TB disease. Of the 10.4 million people that fell ill with TB last year, 0.6 million were infected with multidrug-resistant TB (MDR-TB). Despite the efficacious ‘four-drug’ standard regiment for TB, the global cure rate is only 54% for MDR-TB compared to 83% for drug-susceptible TB. New anti-TB drugs such as bedaquiline, delamanid and pretomanid are successfully used to treat MDR/XDR infections, however, Mycobacterium tuberculosis (Mtb) effectively develops resistance also to these new compounds and clinical resistance was reported less than three years after their introduction. This underscores the need to find new treatment strategies that could cure or improve clinical outcome of serious TB infections and combat the problems with drug-resistance. It is conceivable that the effect of old as well as new antimicrobial agents could be improved by host-directed therapies that restore protective immunity. Mtb has evolved a remarkable ability to manipulate the human immune response including epigenetic changes induced by virulent bacteria as well as changes in host cell metabolism or tissue-remodelling that will compromise immune functions at the site of infection. New findings related to immunopathogenesis in TB would enhance the development of immunomodulatory interventions that can strengthen host cell functions and support conventional chemotherapy.

In this Special Issue, we welcome the submission of original research, review, opinion, and perspective articles focusing on, but not limited to, the following areas of interest:

  • Molecular basis of drug resistance;
  • Identification of novel anti-TB drugs;
  • Molecules targeting key pathways for mycobacterial survival and replication;
  • Epigenetic changes induced by virulent mycobacteria;
  • Immunometabolic changes in tb disease;
  • Studies of host–pathogen interactions in vivo, ex vivo, in situ and in vitro;
  • Local immune responses in granulomatous TB lesions;
  • Tissue repair and remodelling mechanisms with relevance for immune cell function in TB;
  • Research and advances on therapeutic agents that can enter TB lesions;
  • Novel compounds with relevance for host-directed therapies in TB.

Dr. Susanna Brighenti
Dr. Gabriela Godaly
Guest Editors

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Keywords

  • tuberculosis
  • drug resistance
  • granulomatous inflammation
  • pathogenesis
  • immune responses
  • immunomodulation
  • host-directed therapy
  • antimicrobial treatment
  • antimicrobial mechanisms
  • antimicrobial agents

Published Papers (2 papers)

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Research

12 pages, 1822 KiB  
Article
Bactericidal Permeability-Increasing Protein (BPI) Inhibits Mycobacterium tuberculosis Growth
by Silvia Guzmán-Beltrán, Esmeralda Juárez, Brenda L. Cruz-Muñoz, Cesar A. Páez-Cisneros, Carmen Sarabia and Yolanda González
Biomolecules 2024, 14(4), 475; https://doi.org/10.3390/biom14040475 - 13 Apr 2024
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Abstract
Bactericidal permeability-increasing protein (BPI) is a multifunctional cationic protein produced by neutrophils, eosinophils, fibroblasts, and macrophages with antibacterial anti-inflammatory properties. In the context of Gram-negative infection, BPI kills bacteria, neutralizes the endotoxic activity of lipopolysaccharides (LPSs), and, thus, avoids immune hyperactivation. Interestingly, BPI [...] Read more.
Bactericidal permeability-increasing protein (BPI) is a multifunctional cationic protein produced by neutrophils, eosinophils, fibroblasts, and macrophages with antibacterial anti-inflammatory properties. In the context of Gram-negative infection, BPI kills bacteria, neutralizes the endotoxic activity of lipopolysaccharides (LPSs), and, thus, avoids immune hyperactivation. Interestingly, BPI increases in patients with Gram-positive meningitis, interacts with lipopeptides and lipoteichoic acids of Gram-positive bacteria, and significantly enhances the immune response in peripheral blood mononuclear cells. We evaluated the antimycobacterial and immunoregulatory properties of BPI in human macrophages infected with Mycobacterium tuberculosis. Our results showed that recombinant BPI entered macrophages, significantly reduced the intracellular growth of M. tuberculosis, and inhibited the production of the proinflammatory cytokine tumor necrosis factor-alpha (TNF-α). Furthermore, BPI decreased bacterial growth directly in vitro. These data suggest that BPI has direct and indirect bactericidal effects inhibiting bacterial growth and potentiating the immune response in human macrophages and support that this new protein’s broad-spectrum antibacterial activity has the potential for fighting tuberculosis. Full article
(This article belongs to the Special Issue Tuberculosis: Immunopathogenesis and Therapeutic Strategies)
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14 pages, 1790 KiB  
Article
Association of Cytokine Gene Polymorphisms and Their Impact on Active and Latent Tuberculosis in Brazil’s Amazon Region
by Ednelza da Silva Graça Amoras, Thais Gouvea de Morais, Rafaella do Nascimento Ferreira, Samara Tatielle Monteiro Gomes, Francisca Dayse Martins de Sousa, Iury de Paula Souza, Ricardo Ishak, Antonio Carlos Rosário Vallinoto and Maria Alice Freitas Queiroz
Biomolecules 2023, 13(10), 1541; https://doi.org/10.3390/biom13101541 - 18 Oct 2023
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Abstract
Some genetic variations in cytokine genes can alter their expression and influence the evolution of Mycobacterium tuberculosis (Mtb) infection. This study aimed to investigate the association of polymorphisms in cytokine genes and variability in plasma levels of cytokines with the development of tuberculosis [...] Read more.
Some genetic variations in cytokine genes can alter their expression and influence the evolution of Mycobacterium tuberculosis (Mtb) infection. This study aimed to investigate the association of polymorphisms in cytokine genes and variability in plasma levels of cytokines with the development of tuberculosis (TB) and latent tuberculosis infection (LTBI). Blood samples from 245 patients with TB, 80 with LTBI, and healthy controls (n = 100) were included. Genotyping of the IFNG +874A/T, IL6 -174G/C, IL4 -590C/T, and IL10 -1082A/G polymorphisms was performed by real-time PCR, and cytokine levels were determined by flow cytometry. Higher frequencies of genotypes AA (IFNG +874A/T), GG (IL6 -174G/C), TT (IL4 -590C/T), and GG (IL10 -1082A/G) were associated with an increased risk of TB compared to that of LTBI (p = 0.0027; p = 0.0557; p = 0.0286; p = 0.0361, respectively) and the control (p = <0.0001, p = 0.0021; p = 0.01655; p = 0.0132, respectively). In combination, the A allele for IFNG +874A/T and the T allele for IL4 -590C/T were associated with a higher chance of TB (p = 0.0080; OR = 2.753 and p < 0.0001; OR = 3.273, respectively). The TB group had lower levels of IFN-γ and higher concentrations of IL-6, IL-4, and IL-10. Cytokine levels were different between the genotypes based on the polymorphisms investigated (p < 0.05). The genotype and wild-type allele for IFNG +874A/T and the genotype and polymorphic allele for IL4 -590C/T appear to be more relevant in the context of Mtb infection, which has been associated with the development of TB among individuals infected by the bacillus and with susceptibility to active infection but not with susceptibility to latent infection. Full article
(This article belongs to the Special Issue Tuberculosis: Immunopathogenesis and Therapeutic Strategies)
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