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Protection of mice from endotoxic death by 2-methylthio-ATP
R A Proctor1, L C Denlinger, P S Leventhal
1Department of Medical Microbiology, University of Wisconsin Medical School, Madison 53706.
Abstract:
The lethal effects of endotoxin, a bacterial product shed into the blood during bacteremia, are thought to be due to macrophage release of mediators such as tumor necrosis factor alpha and interleukin 1. Although much is known about the pathophysiology of endotoxemia, relatively little is known about the cellular signaling mechanisms that are involved. The data in this study suggest that extracellular adenine nucleotides can influence the development of endotoxin shock. An adenine nucleotide analog, 2-methylthio-ATP, inhibited the endotoxin-stimulated release of toxic mediators (i.e., tumor necrosis factor alpha and interleukin 1), and it protected mice from endotoxin-induced death. These studies suggest a fundamental and unusual role for adenine nucleotides on endotoxin action, and they provide a potentially new therapeutic approach for the control of the pathophysiology of Gram-negative septicemia.
Insights
Extracellular adenine nucleotides may influence endotoxin shock. An analog of adenine nucleotides inhibited toxic mediator release and protected mice from endotoxin-induced death, suggesting a new therapeutic target for septicemia.
Area of Science:
- Immunology
- Pharmacology
- Molecular Biology
Background:
- Endotoxemia, caused by bacterial endotoxins during bacteremia, leads to severe shock.
- Macrophage-released mediators like tumor necrosis factor alpha (TNF-α) and interleukin-1 (IL-1) are key to endotoxin's lethal effects.
- Cellular signaling pathways involved in endotoxin shock remain incompletely understood.
Purpose of the Study:
- To investigate the role of extracellular adenine nucleotides in the development of endotoxin shock.
- To explore the potential of adenine nucleotide analogs as therapeutic agents against endotoxemia.
Main Methods:
- Administration of an adenine nucleotide analog, 2-methylthio-ATP, to mice.
- Measurement of endotoxin-stimulated release of TNF-α and IL-1.
- Assessment of mouse survival following endotoxin challenge.
Main Results:
- 2-methylthio-ATP significantly inhibited the release of TNF-α and IL-1 stimulated by endotoxin.
- Mice treated with 2-methylthio-ATP showed increased survival rates when exposed to endotoxin.
- These findings indicate that extracellular adenine nucleotides modulate the response to endotoxin.
Conclusions:
- Extracellular adenine nucleotides play a significant role in the pathophysiology of endotoxin shock.
- Adenine nucleotide analogs represent a promising novel therapeutic strategy for managing Gram-negative septicemia.
- Targeting adenine nucleotide signaling offers a new avenue for controlling endotoxin-induced inflammatory responses.