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[The complement system in familial Mediterranean fever: studies in 41 families (author's transl)]
Insights
Familial Mediterranean fever shows increased blood complement C4 levels, unaffected by colchicine therapy. This finding, distinct from other protein changes, aids in diagnosing this inflammatory syndrome.
Area of Science:
- Biochemistry
- Immunology
- Pathophysiology
Context:
- Familial Mediterranean fever (FMF) is a genetic autoinflammatory disorder.
- Current diagnostic markers for FMF are primarily clinical.
- Understanding FMF's biochemical alterations is crucial for improved diagnostics.
Purpose:
- To investigate the changes in blood complement components, specifically C4, in patients with familial Mediterranean fever.
- To compare these changes with other serum proteins like haptoglobin and orosomucoid before and after colchicine treatment.
- To evaluate the diagnostic potential of complement component alterations in FMF.
Summary:
- Elevated levels of blood complement components, particularly C4, were observed in familial Mediterranean fever patients.
- These increases persisted both before and after colchicine therapy.
- This pattern contrasts with the decrease in serum haptoglobin and orosomucoid concentrations following therapy.
Impact:
- The distinct pattern of complement component changes offers potential diagnostic value for familial Mediterranean fever.
- These alterations may stem from both hepatic and extrahepatic sources.
- Extrahepatic origins might involve the uptake of circulating monocytes by connective tissue in the sub-mesothelial layer, contributing to the pathology.
Abstract:
A total increase of blood complement components, particularly C4, is found in subjects with familial Mediterranean fever both before and after colchicine therapy. This effect differs from the serum haptoglobin and orosomucoïd concentration decreases detected after identical therapy, confering diagnostic value to this inflammatory syndrome. This could be of both hepatic and extrahepatic origin. For the latter, it is possible that up take of circulating monocytes, macrophage precursors, by the connective tissue of the serum sub-mesothelial layer is responsible for the lesion.