Abstract
The hypocholesterolemic effect of rice bran oil (RBO) is defined in human and animal experiments which indicate the presence of active component(s) in the unsaponifiable fraction, but the detailed mechanism is not known yet. Exogenously hypercholesterolemic (ExHC) rats were fed for 2 weeks on a 0.5% cholesterol diet supplemented with 10% each of RBO, RBO-simulated oil (RBOSO) in its fatty acid composition, or RBOSO plus 0.25% unsaponifiable compounds (UC) from RBO. Rats fed RBO or the UC resulted in lowing serum and liver cholesterol concentration and preventing reduction of high density lipoproteinic-cholesterol. Dietary RBO or the UC led to an elevation of fecal neutral sterol excretion, but no significant change in fecal bile acid excretion or in hepatic abundance of mRNAs for 3-hydroxy-3-methylglutaryl-CoA reductase, cholesterol-7α-hydroxylase, and low density lipoprotein receptor. Besides, serum and liver α-tocopherol concentrations were lowered in RBO or the UC-fed rats. These results show that the UC in RBO leads to a decreased serum cholesterol concentration by interrupting the absorption of intestinal hydrophobic compounds rather than by modifying cholesterol metabolism in the liver.
| Original language | English |
|---|---|
| Pages (from-to) | 371-377 |
| Number of pages | 7 |
| Journal | Bioscience, Biotechnology and Biochemistry |
| Volume | 65 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Feb 1 2001 |
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All Science Journal Classification (ASJC) codes
- Biotechnology
- Analytical Chemistry
- Biochemistry
- Applied Microbiology and Biotechnology
- Molecular Biology
- Organic Chemistry
Cite this
Feeding unsaponifiable compounds from rice bran oil does not alter hepatic mRNA abundance for cholesterol metabolism-related proteins in hypercholesterolemic rats. / Nagao, Koji; Sato, Masao; Takenaka, Miyuki; Ando, Miyuki; Iwamoto, Masako; Imaizumi, Katsumi.
In: Bioscience, Biotechnology and Biochemistry, Vol. 65, No. 2, 01.02.2001, p. 371-377.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Feeding unsaponifiable compounds from rice bran oil does not alter hepatic mRNA abundance for cholesterol metabolism-related proteins in hypercholesterolemic rats
AU - Nagao, Koji
AU - Sato, Masao
AU - Takenaka, Miyuki
AU - Ando, Miyuki
AU - Iwamoto, Masako
AU - Imaizumi, Katsumi
PY - 2001/2/1
Y1 - 2001/2/1
N2 - The hypocholesterolemic effect of rice bran oil (RBO) is defined in human and animal experiments which indicate the presence of active component(s) in the unsaponifiable fraction, but the detailed mechanism is not known yet. Exogenously hypercholesterolemic (ExHC) rats were fed for 2 weeks on a 0.5% cholesterol diet supplemented with 10% each of RBO, RBO-simulated oil (RBOSO) in its fatty acid composition, or RBOSO plus 0.25% unsaponifiable compounds (UC) from RBO. Rats fed RBO or the UC resulted in lowing serum and liver cholesterol concentration and preventing reduction of high density lipoproteinic-cholesterol. Dietary RBO or the UC led to an elevation of fecal neutral sterol excretion, but no significant change in fecal bile acid excretion or in hepatic abundance of mRNAs for 3-hydroxy-3-methylglutaryl-CoA reductase, cholesterol-7α-hydroxylase, and low density lipoprotein receptor. Besides, serum and liver α-tocopherol concentrations were lowered in RBO or the UC-fed rats. These results show that the UC in RBO leads to a decreased serum cholesterol concentration by interrupting the absorption of intestinal hydrophobic compounds rather than by modifying cholesterol metabolism in the liver.
AB - The hypocholesterolemic effect of rice bran oil (RBO) is defined in human and animal experiments which indicate the presence of active component(s) in the unsaponifiable fraction, but the detailed mechanism is not known yet. Exogenously hypercholesterolemic (ExHC) rats were fed for 2 weeks on a 0.5% cholesterol diet supplemented with 10% each of RBO, RBO-simulated oil (RBOSO) in its fatty acid composition, or RBOSO plus 0.25% unsaponifiable compounds (UC) from RBO. Rats fed RBO or the UC resulted in lowing serum and liver cholesterol concentration and preventing reduction of high density lipoproteinic-cholesterol. Dietary RBO or the UC led to an elevation of fecal neutral sterol excretion, but no significant change in fecal bile acid excretion or in hepatic abundance of mRNAs for 3-hydroxy-3-methylglutaryl-CoA reductase, cholesterol-7α-hydroxylase, and low density lipoprotein receptor. Besides, serum and liver α-tocopherol concentrations were lowered in RBO or the UC-fed rats. These results show that the UC in RBO leads to a decreased serum cholesterol concentration by interrupting the absorption of intestinal hydrophobic compounds rather than by modifying cholesterol metabolism in the liver.
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U2 - 10.1271/bbb.65.371
DO - 10.1271/bbb.65.371
M3 - Article
VL - 65
SP - 371
EP - 377
JO - Bioscience, Biotechnology and Biochemistry
JF - Bioscience, Biotechnology and Biochemistry
SN - 0916-8451
IS - 2
ER -