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Delayed and exaggerated postprandial complement component 3 response in familial combined hyperlipidemia.

S Meijssen¹, H van Dijk, C Verseyden

¹Department of Vascular Medicine, University Medical Center Utrecht, Utrecht, The Netherlands.

Arteriosclerosis, Thrombosis, and Vascular Biology

|May 15, 2002

Summary

Familial combined hyperlipidemia (FCHL) patients show an impaired postprandial complement component 3 (C3) response, linked to altered free fatty acid (FFA) metabolism and very low-density lipoprotein overproduction.

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Area of Science:

Metabolic disorders
Lipid metabolism
Complement system

Background:

Familial combined hyperlipidemia (FCHL) is characterized by very low-density lipoprotein (VLDL) overproduction.
Acylation-stimulating protein (ASP), identical to C3adesArg, may be impaired in FCHL, affecting peripheral free fatty acid (FFA) handling.
Impaired FFA uptake due to complement component 3 (C3) response could increase hepatic FFA flux in FCHL.

Purpose of the Study:

To investigate postprandial changes in complement component 3 (C3) in vivo in familial combined hyperlipidemia (FCHL) patients.
To explore the relationship between C3 response, free fatty acid (FFA) metabolism, and VLDL overproduction in FCHL.

Main Methods:

Oral fat loading test conducted on 10 untreated FCHL patients and 10 matched controls.
Measurement of fasting and postprandial plasma levels of C3, ASP, FFA, and hydroxybutyric acid.
Analysis of correlations between C3 response and metabolic markers.

Main Results:

FCHL patients had higher fasting C3 and ASP levels than controls.
Control subjects showed a significant C3 increase at 4 hours post-fat load, while FCHL patients showed a delayed rise at 8 hours.
Postprandial FFA and hydroxybutyric acid were elevated in FCHL, negatively correlating with the early C3 rise.

Conclusions:

FCHL patients exhibit an impaired postprandial C3 response, suggesting a delayed C3 activation.
This impaired C3 response may contribute to reduced peripheral FFA uptake and increased hepatic FFA flux, leading to VLDL overproduction.
The findings link C3 metabolism dysfunction to the characteristic hyperlipidemia in FCHL.