Related Experiment Video
Updated: Jan 28, 2026
Opsonophagocytic Killing Assay to Assess Immunological Responses Against Bacterial Pathogens
Published on: April 5, 2019
Immunologic Pathways in Protective versus Maladaptive Host Responses to Attenuated and Pathogenic Strains of
Jessica Beaudet1,2,3, Edan R Tulman1,2, Katherine Pflaum1,2
1Department of Pathobiology and Veterinary Sciences, University of Connecticut, Storrs, Connecticut, USA.
Abstract:
Mycoplasmas are small bacterial commensals or pathogens that commonly colonize host mucosal tissues and avoid rapid clearance, in part by stimulating inflammatory, immunopathogenic responses. We previously characterized a wide array of transcriptomic perturbations in avian host tracheal mucosae infected with virulent, immunopathologic Mycoplasma gallisepticum; however, mechanisms delineating these from protective responses, such as those induced upon vaccination, have not been thoroughly explored. In this study, host transcriptomic responses to two experimental M. gallisepticum vaccines were assessed during the first 2 days of infection. Relative to virulent infection, host metabolic and immune gene responses to both vaccines were greatly decreased, including early innate immune responses critical to disease development and subsequent adaptive immunity. These data specify host genes and potential mechanisms contributing to maladaptive versus beneficial host responses-information critical for design of vaccines efficacious in both limiting inflammation and enabling pathogen clearance.
Insights
This study reveals that avian Mycoplasma gallisepticum vaccines significantly reduce host immune and metabolic gene responses compared to virulent infection. This information is crucial for developing effective vaccines that limit inflammation and promote pathogen clearance.
Area of Science:
- Veterinary immunology
- Avian pathology
- Bacterial pathogenesis
Background:
- Mycoplasmas colonize mucosal tissues, often evading clearance via immunopathogenic responses.
- Understanding transcriptomic differences between detrimental and protective host responses to Mycoplasma gallisepticum is crucial for vaccine development.
Purpose of the Study:
- To compare host transcriptomic responses to experimental Mycoplasma gallisepticum vaccines versus virulent infection.
- To identify host genes and mechanisms differentiating maladaptive from beneficial immune responses.
Main Methods:
- Transcriptomic analysis of avian tracheal mucosae.
- Assessment of host responses during the early stages of infection (first 2 days) post-vaccination or virulent challenge.
Main Results:
- Experimental Mycoplasma gallisepticum vaccines induced significantly lower host metabolic and immune gene responses compared to virulent infection.
- Early innate immune responses, critical for disease and adaptive immunity, were notably reduced following vaccination.
Conclusions:
- Vaccine-induced host responses are distinct from those elicited by virulent Mycoplasma gallisepticum infection.
- Identifying specific host genes can guide the design of vaccines that balance inflammation control with pathogen clearance.
Related Concept Videos
01:29Immune Response Against Viral Pathogens
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
02:42Transcription Attenuation in Prokaryotes
There are several different mechanisms used to attenuate transcription. In ribosome mediated...
01:23Immunological Memory
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
01:36Humoral Immune Responses
01:27C4 Pathway and CAM
C4 Pathway
The C4 pathway is used by plants such as...
01:16Zones of Protection
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...