Identification of Virulence Determinants During Host-Pathogen Interaction Using Tn-Seq Technology

Damage to our genomes triggers cellular senescence characterised by stable cell cycle arrest and a pro-inflammatory secretome that prevents the unrestricted growth of cells with pathological potential. In this way, senescence can be considered a powerful innate defence against cancer and viral infection. However, damage accumulated during ageing increases the number of senescent cells and this contributes to the chronic inflammation and deregulation of the immune function, which increases susceptibility to infectious disease in ageing organisms. Bacterial and viral pathogens are masters of exploiting weak points to establish infection and cause devastating diseases. This review considers the emerging importance of senescence in the host–pathogen interaction: we discuss the pathogen exploitation of ageing cells and senescence as a novel hijack target of bacterial pathogens that deploys senescence-inducing toxins to promote infection. The persistent induction of senescence by pathogens, mediated directly through virulence determinants or indirectly through inflammation and chronic infection, also contributes to age-related pathologies such as cancer. This review highlights the dichotomous role of senescence in infection: an innate defence that is exploited by pathogens to cause disease.

Download Full-text

Helicobacter pylori: Genomic Insight into the Host-Pathogen Interaction

International Journal of Genomics ◽

10.1155/2015/386905 ◽

2015 ◽

Vol 2015 ◽

pp. 1-8 ◽

Cited By ~ 11

Author(s):

Kathryn P. Haley ◽

Jennifer A. Gaddy

Keyword(s):

Helicobacter Pylori ◽

Bacterial Pathogen ◽

Virulence Determinants ◽

Human Host ◽

Host Pathogen Interaction ◽

Proteomic Data ◽

Genomic Analyses ◽

Host Pathogen ◽

Class 1 ◽

H Pylori

The advent of genomic analyses has revolutionized the study of human health. Infectious disease research in particular has experienced an explosion of bacterial genomic, transcriptomic, and proteomic data complementing the phenotypic methods employed in traditional bacteriology. Together, these techniques have revealed novel virulence determinants in numerous pathogens and have provided information for potential chemotherapeutics. The bacterial pathogen,Helicobacter pylori, has been recognized as a class 1 carcinogen and contributes to chronic inflammation within the gastric niche. Genomic analyses have uncovered remarkable coevolution between the human host andH. pylori. Perturbation of this coevolution results in dysregulation of the host-pathogen interaction, leading to oncogenic effects. This review discusses the relationship ofH. pyloriwith the human host and environment and the contribution of each of these factors to disease progression, with an emphasis on features that have been illuminated by genomic tools.

Download Full-text

Faculty Opinions recommendation of A Novel Mechanism of Host-Pathogen Interaction through sRNA in Bacterial Outer Membrane Vesicles.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.726419717.793534336 ◽

2017 ◽

Author(s):

Burkhard Tümmler

Keyword(s):

Outer Membrane ◽

Membrane Vesicles ◽

Outer Membrane Vesicles ◽

Host Pathogen Interaction ◽

Host Pathogen ◽

Bacterial Outer Membrane

Download Full-text

The Role of Macrophages in the Host’s Defense against Sporothrix schenckii

Pathogens ◽

10.3390/pathogens10070905 ◽

2021 ◽

Vol 10 (7) ◽

pp. 905

Author(s):

Estela Ruiz-Baca ◽

Armando Pérez-Torres ◽

Yolanda Romo-Lozano ◽

Daniel Cervantes-García ◽

Carlos A. Alba-Fierro ◽

...

Keyword(s):

Immune Responses ◽

Macrophage Polarization ◽

Sporothrix Schenckii ◽

Macrophage Cell ◽

Cell Recruitment ◽

Host Pathogen Interaction ◽

Interaction Processes ◽

Host Pathogen ◽

Molecular Patterns

The role of immune cells associated with sporotrichosis caused by Sporothrix schenckii is not yet fully clarified. Macrophages through pattern recognition receptors (PRRs) can recognize pathogen-associated molecular patterns (PAMPs) of Sporothrix, engulf it, activate respiratory burst, and secrete pro-inflammatory or anti-inflammatory biological mediators to control infection. It is important to consider that the characteristics associated with S. schenckii and/or the host may influence macrophage polarization (M1/M2), cell recruitment, and the type of immune response (1, 2, and 17). Currently, with the use of new monocyte-macrophage cell lines, it is possible to evaluate different host–pathogen interaction processes, which allows for the proposal of new mechanisms in human sporotrichosis. Therefore, in order to contribute to the understanding of these host–pathogen interactions, the aim of this review is to summarize and discuss the immune responses induced by macrophage-S. schenckii interactions, as well as the PRRs and PAMPs involved during the recognition of S. schenckii that favor the immune evasion by the fungus.

Download Full-text