Using innate immunity to characterize the host response to microbial invasion in severe sepsis
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Updated: Jul 6, 2026
A Neonatal Imaging Model of Gram-Negative Bacterial Sepsis
Published on: August 12, 2020
Elizabeth A Warner1, Lyle L Moldawer
1University of Florida, Department of Surgery, College of Medicine, Shands Hospital, 1600 SW Archer Road Gainesville, FL 32610-0286, USA. elizabeth.warner@surgery.ufl.edu
Abstract:
Severe sepsis is a life-threatening systemic inflammatory response to microbial infection. Although mortality from severe sepsis has decreased modestly over the past three decades, its incidence is increasing dramatically. Current treatment of severe sepsis relies primarily on identification and appropriate antibiotic coverage of the invading pathogen, with supportive therapies aimed primarily at reducing the risk of associated organ injury. Current efforts to identify the invading pathogens are successful in approximately only 50% of patients with severe sepsis. In this review, we examine host-pathogen interactions through the Toll-like receptors and Nod signaling systems as principal mechanisms of the innate immune response, and explore the application of high-throughput genomic technologies that have permitted a more complete dissection of the innate immune response during severe sepsis. Early controlled studies suggest that these genome-wide tools can readily identify pathogen-specific host responses in macrophages and dendritic cells. However, despite considerable progress, clinical application of these approaches to pathogen recognition in hospitalized patients with severe sepsis is still years away.
Insights
Severe sepsis, a critical infection response, is rising despite treatment advances. New genomic tools show promise for identifying pathogens by analyzing host immune responses, but clinical use is distant.
Area of Science:
- Immunology
- Genomics
- Infectious Diseases
Background:
- Severe sepsis involves a life-threatening inflammatory response to microbial infection, with increasing incidence despite modest mortality reductions.
- Current pathogen identification methods succeed in only about 50% of severe sepsis cases.
- Treatment focuses on antibiotics and supportive care to prevent organ injury.
Purpose of the Study:
- To review host-pathogen interactions via Toll-like receptors and Nod signaling in innate immunity.
- To explore the use of high-throughput genomic technologies for dissecting the innate immune response in severe sepsis.
- To assess the potential of genomic approaches for pathogen recognition.
Main Methods:
- Review of literature on innate immune signaling pathways (Toll-like receptors, Nod signaling).
- Examination of high-throughput genomic technologies for analyzing host responses.
- Analysis of early studies on genome-wide tools in macrophages and dendritic cells.
Main Results:
- Host-pathogen interactions are mediated by Toll-like receptors and Nod signaling systems.
- High-throughput genomics enable detailed analysis of the innate immune response.
- Genome-wide tools can identify pathogen-specific host responses in immune cells.
Conclusions:
- Genomic technologies offer a powerful approach to understanding the innate immune response in severe sepsis.
- These tools show potential for identifying specific pathogens by analyzing host responses.
- Clinical application for pathogen recognition in severe sepsis is still several years away.
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