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Mike Rosenbloom Laboratory for Cardiovascular Research, McGill University Health Centre, Montreal, Quebec, Canada H3A 1A1
Acylation stimulating protein (ASP), a novel
adipocyte-derived autocrine protein, stimulates triglyceride synthesis
and glucose transport in vitro in human and murine adipocytes. In
vitro, chylomicrons increase ASP and precursor complement C3 production
in adipocytes. Furthermore, in vivo, ASP production from human adipose
tissue correlates positively with triglyceride clearance
postprandially. The aim of the present study was to determine if
intraperitoneally injected ASP accelerated triglyceride clearance in
vivo after a fat load in C57Bl/6 mice. ASP increased the triglyceride
clearance with a reduction of the triglyceride area under the curve
over 6 h (AUC0-6) from
102.6 ± 30.0 to 61.0 ± 14.5 mg · dl
1 · h
1
(P < 0.05), especially in the latter
postprandial period (AUC3-6; 56.2 ± 18.0 vs. 24.9 ± 8.9 mg · dl
1 · h
1,
P < 0.025). ASP also reduced plasma
glucose both in the mice with accelerated plasma triglyceride clearance
and in those with relatively delayed triglyceride clearance
(P < 0.025). Therefore, ASP alters
postprandial triglyceride and glucose metabolism.
complement C3a; adipose tissue; glucose; free fatty acid; fat load
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