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Platelet hypersensitivity in acute malaria (Plasmodium falciparum) infection in man
Abstract:
During acute malaria infection, platelets in human platelet-rich plasma re hypersensitive to the addition of ADP between 1.0 micro M and 5.0 micro M, or adrenaline 0.11 micro M as aggregating agents. The mean maximum aggregation amplitude (as % of light transmission) obtained from 8 subjects in response to added ADP (1.0 micro M) , 39.8 +/- 27 (1SD), was significantly greater than the value in 6 controls (5.2 +/- 6.7 (1SD); t = 3,51 P less than 0.005). A similar pattern of response was obtained with higher ADP concentrations (2,4, 4.5 or 5.0 micro M) in 22 patients and 20 control subjects (89.9 +/- 14.9 % vs 77.8 +/- 16.5% (1SD) t = 2,45, P less than 0.02). Addition to 4.5 microM ADP to patient PRP usually evoked only a single aggregation wave (fused primary and secondary waves) while the typical primary and secondary wave pattern was usually obtained from controls. Mean plasma B-thromboglobulin (BTG) concentration in 7 patients (208.3 +/0 15.6 ng/ml) was significantly higher than the value in 6 control subjects (59.2 +/- 15.7 ng/ml; t=13.44, P less than 0.002).
Insights
Platelets in patients with acute malaria show hypersensitivity to aggregating agents like ADP and adrenaline. This heightened platelet reactivity and increased beta-thromboglobulin levels suggest a role in malaria pathogenesis.
Area of Science:
- Hematology
- Infectious Diseases
- Immunology
Background:
- Acute malaria infection can affect various physiological systems.
- Platelet function is crucial in hemostasis and immune responses.
- Alterations in platelet behavior during infection warrant investigation.
Purpose of the Study:
- To investigate platelet aggregation responses in patients with acute malaria.
- To compare platelet sensitivity to aggregating agents between malaria patients and healthy controls.
- To assess plasma beta-thromboglobulin levels in acute malaria.
Main Methods:
- Human platelet-rich plasma (PRP) was used to assess platelet aggregation.
- Platelet aggregation was induced by adenosine diphosphate (ADP) and adrenaline.
- Plasma beta-thromboglobulin (BTG) concentrations were measured.
Main Results:
- Platelets from malaria patients exhibited hypersensitivity to ADP (1.0-5.0 micro M) and adrenaline (0.11 micro M).
- Malaria patients showed significantly higher mean maximum aggregation amplitudes compared to controls.
- Patients displayed fused primary and secondary aggregation waves with ADP, unlike controls.
Conclusions:
- Acute malaria infection leads to hypersensitive platelet aggregation.
- Elevated plasma beta-thromboglobulin levels indicate in vivo platelet activation in malaria.
- These findings suggest altered platelet function contributes to malaria pathophysiology.