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Updated: Oct 12, 2025
Generation and Multi-phenotypic High-content Screening of Coxiella burnetii Transposon Mutants
Published on: May 13, 2015
Recent Advances on the Innate Immune Response to Coxiella burnetii
Guido Sireci1, Giusto Davide Badami1, Diana Di Liberto1
1Central Laboratory of Advanced Diagnostic and Biological Research (CLADIBIOR), Department of Biomedicine, Neurosciences and Advanced Diagnostics (BIND), University Hospital "Paolo Giaccone", Università degli studi di Palermo, Palermo, Italy.
Abstract:
Coxiella burnetii is an obligate intracellular Gram-negative bacterium and the causative agent of a worldwide zoonosis known as Q fever. The pathogen invades monocytes and macrophages, replicating within acidic phagolysosomes and evading host defenses through different immune evasion strategies that are mainly associated with the structure of its lipopolysaccharide. The main transmission routes are aerosols and ingestion of fomites from infected animals. The innate immune system provides the first host defense against the microorganism, and it is crucial to direct the infection towards a self-limiting respiratory disease or the chronic form. This review reports the advances in understanding the mechanisms of innate immunity acting during C. burnetii infection and the strategies that pathogen put in place to infect the host cells and to modify the expression of specific host cell genes in order to subvert cellular processes. The mechanisms through which different cell types with different genetic backgrounds are differently susceptible to C. burnetii intracellular growth are discussed. The subsets of cytokines induced following C. burnetii infection as well as the pathogen influence on an inflammasome-mediated response are also described. Finally, we discuss the use of animal experimental systems for studying the innate immune response against C. burnetii and discovering novel methods for prevention and treatment of disease in humans and livestock.
Insights
Coxiella burnetii causes Q fever by evading host defenses. This review explores innate immunity mechanisms and bacterial strategies during infection, crucial for understanding disease progression and developing treatments.
Area of Science:
- Microbiology
- Immunology
- Infectious Diseases
Background:
- Coxiella burnetii is an obligate intracellular Gram-negative bacterium causing Q fever.
- It invades monocytes and macrophages, replicating in phagolysosomes and employing immune evasion strategies.
- Transmission occurs via aerosols or ingestion of fomites from infected animals.
Purpose of the Study:
- To review advances in understanding innate immunity during Coxiella burnetii infection.
- To explore bacterial strategies for host cell invasion and immune subversion.
- To discuss host cell susceptibility, cytokine responses, inflammasome activity, and animal models.
Main Methods:
- Literature review of innate immunity mechanisms against Coxiella burnetii.
- Analysis of bacterial immune evasion strategies and host gene modulation.
- Discussion of host cell susceptibility, cytokine profiles, and inflammasome responses.
Main Results:
- Innate immunity is critical in determining self-limiting or chronic Q fever.
- Coxiella burnetii utilizes lipopolysaccharide structure and gene modulation for immune evasion.
- Differential host cell susceptibility and specific cytokine/inflammasome responses are observed.
Conclusions:
- Understanding innate immune responses and bacterial evasion tactics is key to combating Coxiella burnetii.
- Animal models are valuable for studying immunity and developing novel prevention and treatment strategies.
- Further research can lead to improved interventions for Q fever in humans and livestock.
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