Abstract
Hypolipidemic effects of gamma-oryzanol (OZ) and cycloartenol ferulic acid ester (CAF) on the hyperlipidemia induced by ingestion of a high cholesterol diet (HCD) in male Sprague-Dawley rats were investigated. The test drugs were given orally and intravenously, daily for 12 days with the HCD feeding. The oral administration with OZ and CAF at 100 mg/kg daily for 6 or 12 days did not apparently prevent the hyperlipidemia induced by HCD-feeding. The intravenous administrations with OZ and CAF at 10 mg/kg for 6 days significantly inhibited the increases in serum total cholesterol (TC), phospholipid (PL) and free cholesterol by HCD. OZ and CAF did not inhibit the decreases of TC in high density lipoprotein (HDL-TC) and HDL-PL by HCD. The increases of atherogenic index [( TC-HDL-TC]/[HDL-TC] and [PL-HDL-PL]/[HDL-PL]) with the HCD feeding were reduced by the intravenous administrations of OZ and CAF. Triglyceride, nonesterified fatty acid, lactate dehydrogenase and transaminase (GOT and GPT) markedly decreased below the control level by the intravenous administrations of OZ and CAF for 12 days. These results suggest that the intravenous administrations of OZ and CAF may have accelerated the excretion of lipids in the blood.
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