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EXAMPLE OF ABSTRACT
8.9 cm
Reduced fat mass in rats fed a high oleic acid-rich safflower
oil diet is associated with changes in expression of hepatic
PPAR and adipose SREBP-1c regulated genes
Shan-Ching Hsu1 and Ching-jang Huang12
1Division of Nutritional Science, Institute of Microbiology and
Biochemistry, 2 Department of Biochemical Science and Technology,
National Taiwan University, Taipei, Taiwan, [email protected]
12.7 cm
PPARs and SREPB-1c are fatty acid regulated transcription factors
that control lipid metabolism at the level of gene expression. This
study compared a high oleic-acid-rich safflower oil (ORSO) diet and
a high butter diet for their effect on adipose mass and expressions of
genes regulated by PPAR and SREPB-1c in rats. Four groups of
Wistar rats were fed 30S (30% ORSO), 5S (5% ORSO), 30B (29%
butter plus 1% ORSO), or 5B (4% butter plus 1% ORSO) diets for 15
wk. The 30% fat diets led to higher adipose tissue mass, hepatic
mRNA expressions of PPAR and SREBP-1c and lower expressions
of SREBP-1c in the retroperitoneal adipose (RWAT) (P < 0.05) than
the 5% fat diets. Compared to the 30B group, the 30S group had less
RWAT mass and lower mRNA expressions of lipoprotein lipase,
adipocyte fatty acid-binding protein, fatty acid synthase, acetyl CoA
carboxylase and SREBP-1c in the RWAT, higher mRNA expressions
of acyl CoA oxidase, carnitine palmitoyl-transferase 1A, fatty acid
binding protein & mitochondrial 3-hydroxy-3-methylglutaryl-CoA
synthase in the liver (P < 0.05). The 18:2(n-6) and 20:4(n-6) contents
in the liver and RWAT of the 30S group were more than 2 fold those
of the 30B group (P < 0.05). These results suggested that the smaller
RWAT mass in rats fed the high ORSO diet might be related to the
higher tissue 18:2(n-6) and 20:4(n-3). This in turn could up-regulate
the expressions of fatty acid catabolic genes through the activation of
in the liver and down-regulate the expressions of lipid
storage and lipogenic gene through the suppression of SREBP-1c in
the RWAT.
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