Pathogenesis and Treatment of Non-Tuberculous Mycobacterial Infections

A special issue of Pathogens (ISSN 2076-0817). This special issue belongs to the section "Bacterial Pathogens".

Deadline for manuscript submissions: 15 May 2025 | Viewed by 1961

Special Issue Editors


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Guest Editor
Fundacao Oswaldo Cruz, Rio de Janeiro, Brazil
Interests: mycobacterial diseases; pathogenesis; innate immunity; immunometabolism
Special Issues, Collections and Topics in MDPI journals

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Guest Editor
Fundacao Oswaldo Cruz, Rio de Janeiro, Brazil
Interests: mycobacterial infections; tuberculosis treatment; infections; resistant TB

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Guest Editor
Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Campus Macaé, Rio de Janeiro, Brazil
Interests: Mycobacterial infections; treatment; emergent pathogens

Special Issue Information

Dear Colleagues,

Non-tuberculous mycobacteria (NTM) are ubiquitous environmental organisms that can cause significant disease in both immunocompromised and immunocompetent individuals. The incidence of NTM pulmonary disease (NTM-PD) is rising globally. However, the efficiency of treatment is variable. Common causative organisms of pulmonary infection are slowly growing mycobacteria, including the Mycobacterium avium complex and Mycobacterium kansasii, and rapidly growing mycobacteria, including the Mycobacterium abscessus complex. Future approaches to the management of NTM pulmonary disease will require specific therapies that are well tolerated; can be taken for a shorter time and, perhaps, less frequently; have few drug–drug interactions; and are active against the various strains of pathogens. There is a demand for drugs that specifically target these bacteria, but we cannot exclude the possibility of using a host-direct therapy strategy. As the number of infections increases, such therapies will be welcomed by clinicians and patients.

In this Special Issue, we aim to provide a collection of research articles, comprehensive reviews, and short communications in line with the treatment and pathogenesis of NTM infections. Through this collection, we will pinpoint the current situation and future perspectives of the control of pulmonary disease caused by NTM.

We look forward to your involvement in this Special Issue.

Prof. Dr. Roberta Olmo Pinheiro
Prof. Dr. Margareth Pretti Dalcolmo
Dr. Ana Carolina Carvalho
Guest Editors

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Keywords

  • non-tuberculous mycobacteria
  • treatment
  • pathogenesis

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Published Papers (2 papers)

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Research

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16 pages, 3188 KiB  
Article
Novel Synthetic Peptide Agelaia-12 Has Improved Activity Against Mycobacterium abscessus Complex
by Arthur Alves Coelho, Lília Cristina de Souza Barbosa, Adeliane Castro da Costa, André Kipnis and Ana Paula Junqueira-Kipnis
Pathogens 2024, 13(11), 994; https://doi.org/10.3390/pathogens13110994 - 13 Nov 2024
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Abstract
Fast-growing mycobacteria cause difficult-to-treat infections due to their high intrinsic resistance to antibiotics as well as disinfectant agents. Mycobacterium abscessus complex (MAC) is the main cause of nontuberculous mycobacteria diseases. In this work, we evaluated the activity of the novel synthetic antimicrobial peptide, [...] Read more.
Fast-growing mycobacteria cause difficult-to-treat infections due to their high intrinsic resistance to antibiotics as well as disinfectant agents. Mycobacterium abscessus complex (MAC) is the main cause of nontuberculous mycobacteria diseases. In this work, we evaluated the activity of the novel synthetic antimicrobial peptide, Agelaia-12, against Mycobacterium abscessus and M. massiliense. Agelaia-12 showed a minimum inhibitory concentration (MIC) of 25 μM detected against M. abscessus and M. massiliense with no cytotoxicity. The scanning electronic microscopy analysis of mycobacterial treated with Agelaia-12 demonstrated the presence of filamentous structures and aggregation of the cells. Congo red binding assay of M. abscessus exhibited altered dye accumulation after treatment with Agelaia-12. Treatment of M. abscessus- or M. massiliense-infected murine macrophages with Agelaia-12 decreased the mycobacterial load by 92% for the tested strains. Additionally, IFN-y KO mice infected with M. abscessus or M. massiliense and treated with Agelaia-12 showed a 98% reduction in lung bacterial load. Thus, the synthetic peptide Agelaia-12 may be a promising biomolecule for the treatment of mycobacteriosis, and its structural properties may serve as a foundational model for the design and development of novel pharmaceutical agents aimed at combating this disease. Full article
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Review

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19 pages, 1734 KiB  
Review
Cell Death Mechanisms in Mycobacterium abscessus Infection: A Double-Edged Sword
by Rhana Berto da Silva Prata and Roberta Olmo Pinheiro
Pathogens 2025, 14(4), 391; https://doi.org/10.3390/pathogens14040391 - 16 Apr 2025
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Abstract
Infections caused by non-tuberculous mycobacteria (NTM), such as Mycobacterium abscessus, elicit diverse cell death mechanisms including apoptosis, necrosis, and pyroptosis, which play key roles in immunopathogenesis. NTM can manipulate these cell death pathways to evade host immune responses, ensuring their intracellular survival [...] Read more.
Infections caused by non-tuberculous mycobacteria (NTM), such as Mycobacterium abscessus, elicit diverse cell death mechanisms including apoptosis, necrosis, and pyroptosis, which play key roles in immunopathogenesis. NTM can manipulate these cell death pathways to evade host immune responses, ensuring their intracellular survival and persistence. Apoptosis may aid in antigen presentation and immune activation, while necrosis and pyroptosis trigger excessive inflammation, leading to tissue damage. Autophagy, a crucial cellular defense mechanism, is often induced in response to NTM infection; however, M. abscessus has evolved mechanisms to inhibit autophagic processes, enhancing its ability to survive within host cells. This manipulation of cell death pathways, particularly the dysregulation of autophagy and ferroptosis, contributes to chronic infection, immune evasion, and tissue damage, complicating disease management. Understanding these mechanisms offers potential therapeutic targets for improving treatment strategies against M. abscessus infections. Full article
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