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Endotoxin shock and tumour necrosis factor release in mannoheptulose-treated mice
Abstract:
Administration of mannoheptulose partially protected mice infected with Listeria monocytogenes against the lethal effect of a subsequent endotoxin challenge. The ability of these animals to produce tumour necrosis factor was however unaffected. Mannoheptulose was observed to reverse the hypoglycaemic effect of endotoxin, possibly through inhibition of insulin secretion. The therapeutic significance of these observations is discussed.
Insights
Mannoheptulose protected mice against lethal endotoxin effects after Listeria infection, without impacting tumor necrosis factor production. It also reversed endotoxin-induced hypoglycemia, suggesting therapeutic potential.
Area of Science:
- Immunology
- Endocrinology
- Microbiology
Background:
- Listeria monocytogenes infection can lead to severe complications.
- Endotoxins trigger significant physiological responses, including lethal effects and hypoglycemia.
- Tumor necrosis factor (TNF) plays a role in the immune response to infection and endotoxins.
Purpose of the Study:
- To investigate the protective effects of mannoheptulose in a mouse model of Listeria monocytogenes infection followed by endotoxin challenge.
- To assess the impact of mannoheptulose on tumor necrosis factor production in infected mice.
- To determine if mannoheptulose can mitigate the hypoglycemic effects of endotoxin.
Main Methods:
- Mice infected with Listeria monocytogenes were administered mannoheptulose.
- A subsequent challenge with endotoxin was administered to assess survival rates.
- Tumor necrosis factor production was measured.
- Blood glucose levels were monitored to evaluate hypoglycemic effects.
Main Results:
- Mannoheptulose administration conferred partial protection against the lethal effects of endotoxin challenge in Listeria-infected mice.
- Tumor necrosis factor production remained unaffected by mannoheptulose treatment.
- Mannoheptulose reversed the hypoglycemia induced by endotoxin.
- Inhibition of insulin secretion is proposed as a mechanism for the observed reversal of hypoglycemia.
Conclusions:
- Mannoheptulose demonstrates partial therapeutic efficacy in mitigating lethal endotoxin effects post-Listeria infection.
- The compound's ability to reverse endotoxin-induced hypoglycemia warrants further investigation for potential clinical applications.
- Mannoheptulose does not appear to modulate TNF-alpha production in this model.