Related Experiment Videos
Differences in levels of soluble E-selectin and VCAM-1 in malignant versus non malignant Mediterranean spotted fever
F Dignat-George1, H Tissot-Dupont, G E Grau
1Laboratoire d'Hématologie, Hôpital de La Conception, Marseille, France.
Abstract:
In the present study, we investigated the plasma levels of soluble adhesion molecules E-selectin, P-selectin, intercellular adhesion molecule- (ICAM- ) and vascular cell adhesion molecule-1(VCAM-1) in 24 patients with Mediterranean spotted fever (MSF), 6 of whom with a malignant form. Measurements were performed on blood samples collected before treatment (T1), then twice during treatment (T2 and T3). Before treatment, MSF patients taken as a whole presented elevated levels of sICAM-1 and sVCAM-1 and normal levels of sE-selectin and sP-selectin compared to healthy controls. We found that sICAM-1 was elevated both in mild and malignant MSF. sE-selectin and sVCAM-1 were elevated only in patients with the malignant form and allowed to discriminate the two clinical subgroups. Their levels decreased after treatment with sE-selectin reaching control values at T2 whereas sVCAM-1 remained higher over the course of the malignant form. In patients with mild MSF, sP-selectin steadily increased after treatment, whereas it did not present any modification at any of the two sampling times in patients with the malignant form. Raised plasma levels of sE-selectin and sVCAM-1 reflect endothelial activation in malignant rickettsial disease and may be sufficiently early markers to influence the therapeutic decision.
Insights
Mediterranean spotted fever (MSF) patients show elevated soluble intercellular adhesion molecule-1 (sICAM-1) and soluble vascular cell adhesion molecule-1 (sVCAM-1) before treatment. Malignant MSF cases exhibit higher sE-selectin and sVCAM-1, indicating endothelial activation and potential early diagnostic markers.
Area of Science:
- Infectious Diseases
- Immunology
- Biomarkers
Background:
- Mediterranean spotted fever (MSF) is a tick-borne illness.
- Endothelial activation is implicated in severe rickettsial diseases.
- Soluble adhesion molecules (sAdM) are potential indicators of endothelial dysfunction.
Purpose of the Study:
- To investigate plasma levels of soluble adhesion molecules (sE-selectin, sP-selectin, sICAM-1, sVCAM-1) in MSF patients.
- To differentiate between mild and malignant forms of MSF using sAdM levels.
- To assess the changes in sAdM levels during treatment for MSF.
Main Methods:
- Plasma samples were collected from 24 MSF patients (6 with malignant form) before and during treatment.
- Levels of sE-selectin, sP-selectin, sICAM-1, and sVCAM-1 were measured using ELISA.
- Data were compared between MSF patients and healthy controls, and between mild and malignant MSF subgroups.
Main Results:
- MSF patients had elevated sICAM-1 and sVCAM-1 pre-treatment compared to controls.
- sE-selectin and sVCAM-1 were significantly higher in malignant MSF, distinguishing it from mild MSF.
- sE-selectin levels decreased to normal post-treatment in malignant MSF, while sVCAM-1 remained elevated.
- sP-selectin increased post-treatment in mild MSF but showed no change in malignant MSF.
Conclusions:
- Elevated plasma sE-selectin and sVCAM-1 indicate endothelial activation in severe MSF.
- These molecules may serve as early biomarkers for identifying severe rickettsial disease.
- Monitoring sAdM levels could potentially guide therapeutic decisions in MSF management.