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Updated: Dec 30, 2025
A Reproducible Intensive Care Unit-Oriented Endotoxin Model in Rats
Published on: February 20, 2021
Outlining key inflammation-associated parameters during early phase of an experimental gram-negative sepsis model in
Jose J Rosado-Franco1, Marcos J Ramos-Benitez1, Laura M Parodi2
1Department of Microbiology and Medical Zoology Medical Sciences Campus University of Puerto Rico San Juan Puerto Rico.
Abstract:
The aim of this study was to identify inflammation-associated markers during the early phase of sepsis in rhesus macaque. Four rhesus macaques were given an intravenous dose of 1010 CFU/kg of E. coli. Blood samples were collected before, or 30 minutes, 2, 4, 6 and 8 hours after E. coli infusion. Physiological parameters, bacteremia, endotoxemia, C-reactive protein (CRP), procalcitonin (PCT), and plasma cytokines/chemokines were determined for each animal. Bacteremia was present in all animals from 30 minutes to 3 hours after E. coli infusion whereas endotoxin was detected during the full-time course. CRP and PCT levels remained at detectable levels during the whole experimental window suggesting an ongoing inflammatory process. Signature cytokines and chemokines such as TNF-α, MIP-1α, and MIP-1β peaked about 2 hours after E. coli infusion and decreased thereafter. Plasma IL-6, IL-12p40, IFN-γ, and IL-1Ra, as well as I-TAC, MIG, IP-10 and MCP-1, remained at detectable levels after 4 hours of E. coli infusion. This nonhuman primate model could be useful for the assessment of new therapeutics aiming to suppress key inflammatory markers throughout sepsis early phases.
Insights
This study identified key inflammation markers in rhesus macaques during early sepsis. Early detection of these sepsis markers, including cytokines and chemokines, can aid therapeutic development.
Area of Science:
- * Primate immunology
- * Infectious disease modeling
- * Sepsis pathophysiology
Background:
- * Sepsis is a life-threatening condition characterized by dysregulated host response to infection.
- * Early identification of inflammation-associated markers is crucial for effective sepsis management.
- * Nonhuman primate models offer valuable insights into human disease processes.
Purpose of the Study:
- * To identify and characterize inflammation-associated markers in the early stages of sepsis.
- * To evaluate the utility of a rhesus macaque model for sepsis research.
- * To analyze the temporal dynamics of key inflammatory markers following bacterial challenge.
Main Methods:
- * Rhesus macaques were intravenously administered E. coli to induce sepsis.
- * Blood samples were collected at multiple time points post-infusion.
- * Analysis included physiological parameters, bacteremia, endotoxemia, C-reactive protein (CRP), procalcitonin (PCT), and plasma cytokines/chemokines.
Main Results:
- * Bacteremia and endotoxemia were detected early and persisted throughout the study.
- * C-reactive protein (CRP) and procalcitonin (PCT) remained elevated, indicating ongoing inflammation.
- * Specific cytokines (e.g., TNF-α, IL-6) and chemokines (e.g., MIP-1α, MCP-1) showed distinct temporal patterns, peaking around 2-4 hours post-infusion.
Conclusions:
- * The rhesus macaque model effectively recapitulates early sepsis pathophysiology.
- * Identified inflammatory markers provide a temporal profile of the host response.
- * This model is suitable for evaluating novel therapeutics targeting early sepsis inflammatory pathways.
