Effects of short-term administration of conjugated linoleic acid on lipid metabolism in white and brown adipose tissues of starved/refed Otsuka Long-Evans Tokushima Fatty rats
Sm. Rahman et al., Effects of short-term administration of conjugated linoleic acid on lipid metabolism in white and brown adipose tissues of starved/refed Otsuka Long-Evans Tokushima Fatty rats, FOOD RES IN, 34(6), 2001, pp. 515-520
The present study explored the short-term effects of dietary conjugated lin
oleic acid (CLA) on body fat accumulation and lipid metabolism in starved/r
efed Otsuka Long-Evans Tokushima Fatty (OLETF) rats. Male OLETF rats of 12-
weeks-old were starved for 24 h and then re-fed for 48 h either with CLA di
et [7.5% CLA and 7.5% safflower oil (SAF)] or SAF control diet (15% SAF oil
). The results demonstrated a 27% reduction of white adipose tissue wet wei
ght (total of epididymal and perirenal adipose tissue weight) in the CLA gr
oup compared to the control group. The activity of mitochondrial carnitine
palmitoyltransferase (CPT), the rate-limiting enzyme for fatty acid oxidati
on, was significantly elevated by 1.7- and 1.6-fold in perirenal white adip
ose tissue and interscapular brown adipose tissues, respectively, in the CL
A group compared to the control. In contrast, phosphatidate phosphohydrolas
e (PAP), the rate-limiting enzyme for triglyceride (TG) synthesis, was foun
d to be 23 and 15% lower, in perirenal white- and brown-adipose tissue of C
LA-fed rats, respectively. In addition, CLA feeding led to a significant re
duced concentration of serum total- and HDL-cholesterol and phospholipid. T
hus, dietary CLA evidently lowers abdominal white adipose tissue wet weight
through an enhanced fatty acid oxidation and a reduced TG synthesis. (C) 2
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