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Is Reye's syndrome caused by augmented release of tumour necrosis factor?
Abstract:
Reye's syndrome affects children with a history of viral infection treated with aspirin. Its pathogenesis is unclear. Tumour necrosis factor (TNF) is released by macrophages activated by viral infection, endotoxin, and phagocytosis, and it has been shown to be a mediator of the toxic and metabolic effects of endotoxaemia. The metabolic effects of endotoxin and TNF are similar to those found in Reye's syndrome. Raised levels of TNF are released from macrophages treated with non-steroidal anti-inflammatory drugs, and young animals are known to be more sensitive than mature animals to both TNF and endotoxin. These observations lead to the hypothesis that an increased release of TNF in selected young patients treated with aspirin contributes to the development of Reye's syndrome.
Insights
Reye's syndrome may be caused by increased tumor necrosis factor (TNF) release in children treated with aspirin after a viral infection. This mechanism explains the syndrome's metabolic effects and aspirin's role.
Area of Science:
- Pediatric Medicine
- Immunology
- Toxicology
Background:
- Reye's syndrome is a serious condition affecting children post-viral infection and aspirin use, with unknown causes.
- Tumor necrosis factor (TNF), a cytokine released by macrophages, mediates toxic and metabolic effects in conditions like endotoxemia.
- The metabolic disturbances in Reye's syndrome resemble those caused by endotoxin and TNF.
Purpose of the Study:
- To hypothesize the role of tumor necrosis factor (TNF) in the pathogenesis of Reye's syndrome.
- To investigate the link between aspirin, viral infections, and TNF production in susceptible children.
Main Methods:
- Reviewing existing knowledge on Reye's syndrome, viral infections, aspirin, and tumor necrosis factor (TNF).
- Comparing the metabolic effects of endotoxin and TNF to those observed in Reye's syndrome.
- Considering the sensitivity of young animals to TNF and endotoxin.
Main Results:
- Macrophages release TNF when activated by viral infections, endotoxins, and phagocytosis.
- Non-steroidal anti-inflammatory drugs, including aspirin, can increase TNF release from macrophages.
- Younger organisms exhibit heightened sensitivity to both TNF and endotoxin compared to mature ones.
Conclusions:
- Increased TNF release, potentially triggered by aspirin in children with viral infections, is hypothesized to contribute to Reye's syndrome development.
- This hypothesis integrates the roles of viral illness, aspirin, and TNF in the syndrome's pathogenesis.
- Further research is warranted to confirm the role of TNF in Reye's syndrome.