Journal of Lipid Research, Vol 30, 1727-1733, Copyright © 1989 by Lipid Research, Inc.

ARTICLES

Metabolic response of Acylation Stimulating Protein to an oral fat load

K Cianflone, H Vu, M Walsh, A Baldo and A Sniderman
McGill Unit for the Prevention of Cardiovascular Disease, Royal Victoria Hospital, McGill University, Montreal, Quebec, Canada.

Acylation Stimulating Protein (ASP) is a small (mol wt 14,000), basic (pI 9.0) protein present in human plasma. When examined in vitro with normal human cultured skin fibroblasts and adipocytes, ASP appears to be the most potent stimulant of triglyceride synthesis yet described. In this study, a competitive ELISA assay for ASP has been developed using immunospecific polyclonal antibodies, and ASP levels have been measured in seven normal subjects. Following an oral fat load, a sustained significant increase in ASP occurs, whereas after an oral glucose load, ASP levels do not change significantly. These responses are entirely opposite to those of insulin, which rises sharply but transiently after an oral glucose load but is unchanged after an oral fat load. Both the fasting and peak ASP levels were significantly related to the postprandial lipemia. These data provide the first in vivo evidence that Acylation Stimulating Protein may play an important physiological role in the normal response to an oral fat load.
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