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Updated: Jul 2, 2026
A Data-Driven Approach to Quantifying Immune States in Sepsis
Published on: February 7, 2025
Sepsis: links between pathogen sensing and organ damage
Elliott Crouser1, Matthew Exline, Daren Knoell
1Division of Pulmonary, Allergy, Critical Care and Sleep Medicine, Davis Heart and Lung Research Institute, The Ohio State University, Columbus, OH 43210, USA. crouser-1@medctr.osu.edu
Abstract:
The host's inflammatory response to sepsis can be divided into two phases, the initial detection and response to the pathogen initiated by the innate immune response, and the persistent inflammatory state characterized by multiple organ dysfunction syndrome (MODS). New therapies aimed at pathogen recognition receptors (PRRs) particularly the TLRs and the NOD-like receptors offer hope to suppress the initial inflammatory response in early sepsis and to bolster this response in late sepsis. The persistence of MODS after the initial inflammatory surge can also be a determining factor to host survival. MODS is due to the cellular damage and death induced by sepsis. The mechanism of this cell death depends in part upon mitochondrial dysfunction. Damaged mitochondria have increased membrane permeability prompting their autophagic removal if few mitochondria are involved but apoptotic cell death may occur if the mitochondrial losses are more extensive. In addition. severe loss of mitochondria results in low cell energy stores, necrotic cell death, and increased inflammation driven by the release of cell components such as HMGB1. Therapies, which aim at improving cellular energy reserves such as the promotion of mitochondrial biogenesis by insulin, may have a role in future sepsis therapies. Finally, both the inflammatory responses and the susceptibility to organ failure may be modulated by nutritional status and micronutrients, such as zinc, Therapies aimed at micronutrient repletion may further augment approaches targeting PRR function and mitochondrial viability.
Insights
Sepsis involves two inflammatory phases; new therapies targeting pathogen recognition receptors and mitochondrial function offer hope for managing sepsis and multiple organ dysfunction syndrome (MODS). Nutritional status also plays a key role in modulating sepsis outcomes.
Area of Science:
- Immunology
- Cellular Biology
- Critical Care Medicine
Background:
- Sepsis triggers a biphasic inflammatory response, involving innate immunity and leading to multiple organ dysfunction syndrome (MODS).
- Cellular damage and death in MODS are significantly influenced by mitochondrial dysfunction.
- Nutritional status and micronutrients impact inflammatory responses and organ failure susceptibility in sepsis.
Purpose of the Study:
- To explore novel therapeutic strategies for sepsis by targeting pathogen recognition receptors (PRRs) and improving mitochondrial function.
- To investigate the role of mitochondrial viability and cellular energy reserves in sepsis-induced cell death.
- To examine the influence of nutritional status and micronutrients on sepsis progression and treatment.
Main Methods:
- Review of current understanding of sepsis pathophysiology, focusing on inflammatory phases and cellular mechanisms.
- Analysis of therapeutic targets including pathogen recognition receptors (TLRs, NOD-like receptors) and mitochondrial biogenesis.
- Consideration of the impact of nutritional interventions and micronutrient repletion (e.g., zinc) on sepsis management.
Main Results:
- Pathogen recognition receptors (PRRs) present therapeutic opportunities for modulating early and late sepsis inflammation.
- Mitochondrial dysfunction is a key driver of cell death (apoptosis, necrosis) and inflammation in sepsis.
- Interventions promoting mitochondrial biogenesis (e.g., insulin) and micronutrient repletion may improve sepsis outcomes.
Conclusions:
- Targeting PRRs and enhancing mitochondrial viability are promising avenues for future sepsis therapies.
- Addressing cellular energy deficits and inflammation through interventions like insulin and micronutrients could improve host survival.
- Integrated therapeutic approaches combining immunomodulation, metabolic support, and nutritional optimization are crucial for effective sepsis management.
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