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Factors contributing to the development of cerebral malaria. II. Endotoxin
Abstract:
Limulus amoebocyte lysate test (LALT) was used to detect endotoxin-like substances in the plasma of 15 patients with cerebral malaria, 28 patients with uncomplicated falciparum malaria and 30 healthy controls. On admission, 67% of cerebral malaria patients were positive, whereas only 21.4% of uncomplicated malaria patients and none of controls were positive. Among uncomplicated malaria cases, four of eight patients with parasitaemia over 90,000/mm3 were LALT positive whereas only two of 20 patients with parasitaemia of less than 90,000/mm3 were positive. A follow-up study in cerebral malaria patients showed some variation in LALT positivity rate from day to day (85.7% on day 1, 53.3% on day 3 and all negative on discharge from hospital). LALT positivity bore no relationship to gram negative bacteraemia. Leucocytosis and elevated serum enzymes were more frequently found in LALT-positive patients. Our results suggest that endotoxin (LALT positivity) of the plasma of malaria patients is derived from either the parasites themselves or from the gut. It relates to parasitaemia, leucocytosis and elevated serum enzymes, but not to the clinical syndrome of cerebral malaria.
Insights
The Limulus amoebocyte lysate test (LALT) detected endotoxin-like substances in malaria patients, correlating with parasitemia and elevated enzymes, but not cerebral malaria severity.
Area of Science:
- Medical research
- Parasitology
- Toxicology
Background:
- Malaria, particularly Plasmodium falciparum, can lead to severe complications.
- Endotoxins are implicated in various disease pathologies.
- The Limulus amoebocyte lysate test (LALT) is a sensitive assay for detecting endotoxin-like substances.
Purpose of the Study:
- To investigate the presence and significance of endotoxin-like substances in the plasma of patients with cerebral and uncomplicated malaria.
- To explore the relationship between endotoxin-like substances, parasitemia, and clinical outcomes.
Main Methods:
- Plasma samples from patients with cerebral malaria, uncomplicated falciparum malaria, and healthy controls were tested using the Limulus amoebocyte lysate test (LALT).
- Parasitemia levels, white blood cell counts, and serum enzyme levels were assessed.
- Follow-up LALT testing was performed on cerebral malaria patients during their hospital stay.
Main Results:
- LALT positivity was significantly higher in cerebral malaria patients (67%) and uncomplicated malaria patients (21.4%) compared to controls (0%).
- In uncomplicated malaria, LALT positivity correlated with higher parasitemia levels (>90,000/mm3).
- LALT positivity was associated with leucocytosis and elevated serum enzymes but not with gram-negative bacteremia or the clinical syndrome of cerebral malaria.
Conclusions:
- Endotoxin-like substances detected by LALT in malaria patients may originate from the parasites or the gut.
- LALT positivity is linked to parasitemia, leucocytosis, and elevated serum enzymes.
- LALT positivity does not appear to be directly related to the development of cerebral malaria.