흰쥐에서 양파 농축액의 고지혈 개선 작용
A Concentrated Onion Extract Lowers Serum Lipid Levels in Rats Fed a High-Fat Diet
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참고문헌
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초록
양파 농축액이 흰쥐 동물모델에서 고지방식이로 유도된 고지혈증에 어떤 영향을 미치는지를 조사하였다. 고지방식이가 혼합된 식이만 공급된 동물군을 대조군, 고지방 식이와 함께 양파 농축액 중 양파만 제거된 농축액만 공급된 동물군을 위약군, 그리고 고지방 식이와 양파 농축액을 함께 공급된 동물군을 농도에 따라 저농도군, 중농도군, 고농도군으로 8마리씩 5그룹으로 나누어 6주간 사육하였다. 시작전, 3주째 그리고 6주째에 혈액을 채취하였고 간은 6 주 혈액 채취 직후 적출되었다. 대조군과 실험군 모두 연구 시작부터 종료 시까지 지속적으로 체중이 증가하였으나 그룹 간에 유의적인 차이를 보이지 않았다. 양파 농축액을 공급받은 동물군들의 혈액의 중성지방, 총콜레스테롤 non-HDL콜레스테롤 수치는 고지방 식이를 지속적으로 동시에 공급받았음에도 불구하고 6주째에는 대조군에 비해서 유의적으로 감소되는 경향을 보였다. 간의 총지방 함량이나 총지방산의 농도는 대조군과 비교해서 양파농축액 고농도 급여군에서만 유의적으로 감소되는 경향을 보였다. 이상의 실험 결과들을 종합해 볼 때, 6주 동안 고지방 식이로 유도된 실험동물의 고지혈은 양파 농축액에 의해서 유의적으로 개선되는 경향을 보였다. 이 실험 결과는 양파 농축액이 혈액의 중성지방과 총콜레스테롤을 감소시킴으로서 고지혈증 개선에 효과가 있어 고지혈증을 완화하는데 효과적인 식이적인 수단이 될 것으로 판단된다.
Abstract
It is known that onions, or bioactive compounds therein, providehealth benefits. The present study was designed to investigate whether a concentrated onion extract lowered blood lipid levels in rats fed a high-fat diet. Initially, male Sprague-Dawley rats were housed singly in an environment in which temperature and light duration were controlled, and had free access to a nutritionally adequate AIN-93G diet and deionized water. After an acclimatization period, rats were weight-matched and assigned to one of the following five groups: 1) a control group, fed the AIN-93G diet mixed with 10% (w/v) lard and 0.7% (w/v) cholesterol to induce hyperlipidemia (control); 2) three experimental groups, fed the AIN-93G diet mixed with a high-fat source plus concentrated onion extract at three different levels (termed the low-dose, medium-dose, and high-dose groups); and, 3) a placebo group, fed the AIN-93G diet with fats plus the same concentrated extract but devoid of onion-derived material. All five groups freely ingested their respective diets over 6 weeks. At 0, 3, and 6 weeks, blood samples were collected from the orbital sinus following overnight food deprivation. At 6 weeks, livers were collected. Both control and experimental groups continually gained body weight throughout the study. No significant differencein body weight gain was observed among groups. However, the serum concentrations of triglycerides, total cholesterol, and non HDL-cholesterol were significantly reduced by ingestion of concentrated onion extract. Also, the hepatic levels of total lipids and total fatty acids, especially C18:1 (oleic acid), were significantly decreased in rats fed a high level of concentrated onion extract, compared with the control and placebo groups. These results provide clear evidence that ingestion of a concentrated onion extract has a profound inhibitory effect on serum lipid levels in rats fed a high-fat diet. Our findings indicate that a concentrated onion extract may be used to alleviate hyperlipidemia by lowering serum cholesterol and triglyceride levels.
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