Chylomicron accelerates C3 tick-over by regulating the role of Factor H, leading to overproduction of acylation stimulating protein

Acylation stimulating protein (ASP) is a fragment of the third component of complement (C3) that is generated in the presence of chylomicron, and plays a role in the synthesis of triacylglycerol by transporting free fatty acids into adipocytes. However, the precise mechanism of ASP generation, espec...

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Bibliographic Details
Published in:Journal of clinical laboratory analysis 2007, Vol.21 (1), p.14-23
Main Authors: Fujita, Takayuki, Fujioka, Takayuki, Murakami, Tetsuo, Satomura, Atsushi, Fuke, Yoshinobu, Matsumoto, Koichi
Format: Article
Language:English
Subjects:
acylation stimulating protein
adipocyte
C3 tick-over
chylomicron
Chylomicrons - chemistry
Chylomicrons - metabolism
Complement Activation
Complement C3a - chemistry
Complement C3a - metabolism
Complement Factor H - chemistry
Complement Factor H - metabolism
factor H
Humans
Metabolic Syndrome - immunology
Original
Serum - chemistry
Temperature
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Summary:Acylation stimulating protein (ASP) is a fragment of the third component of complement (C3) that is generated in the presence of chylomicron, and plays a role in the synthesis of triacylglycerol by transporting free fatty acids into adipocytes. However, the precise mechanism of ASP generation, especially the role of chylomicron in ASP generation, is unknown. We examined the mechanism through which chylomicron induces ASP generation. Ultracentrifugationally separated chylomicron was incubated with normal human serum (NHS) under various conditions, and the amounts of complement activation products and ASP in the incubation mixture were determined by enzyme‐linked immunosorbent assay (ELISA). Upon incubation of NHS with various amounts of chylomicron for 120 min, ASP was generated in a dose‐dependent manner. The time course of the production of ASP was similar to the time course of the C3 tick‐over phenomenon that occurred by depletion of factor H from the serum. The complement activation induced by chylomicron was different from the usual complement activation that occurs under the regulation of factor H and factor I with respect to the time course and the amount of ASP produced. Our results indicate that chylomicron accelerates C3 tick‐over by regulating the role of factor H, leading to the overproduction of ASP. J. Clin. Lab. Anal. 21:14–23, 2007. © 2007 Wiley‐Liss, Inc.
ISSN:0887-8013
1098-2825
DOI:10.1002/jcla.20158