• 제목/요약/키워드: HMG-CoA reductase

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대두 이소플라본 당전이 반응 산물의 콜레스테롤 생합성 저해 효과 (Inhibitory Effects of Transglycoslyation Products of Soy Isoflavones on Cholesterol Biosynthesis)

  • 유랑국;최승준;문태화;심재훈
    • 한국식품영양과학회지
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    • 제45권2호
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    • pp.293-297
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    • 2016
  • HMG-CoA reductase는 체내 콜레스테롤 생합성에 있어서 속도제한단계(율속) 효소이다. 본 연구는 HMG-CoA reductase에 대한 이소플라본 배당체의 저해 효과를 연구하였다. $100{\mu}M$의 농도에서 genistein-7-O-triglucoside(G2-genistin)는 HMG-CoA reductase 활성을 약 18% 정도 저해하였으나, daidzein-7-O-triglucoside는 저해 효과를 갖지 않았다. 시리아햄스터 HMG-CoA reductase의 반응속도 실험에서 G2-genistin은 농도에 관계없이 $V_{max}$의 저해 정도가 일정하였으며, 이것은 G2-genistin이 HMG-CoA reductase의 경쟁적 저해제로 작용함을 시사하고 HMG-CoA reductase의 활성을 직접적으로 저해함으로써 혈중 콜레스테롤 함량을 감소시킬 수 있음을 예상할 수 있다.

The Effects of Thyroid Hormone on the HMG-CoA Reductase Gene Expression

  • Choi, Jae-Won;Choi, Hong-Soon;Kim, Kyung-Hwan
    • BMB Reports
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    • 제28권6호
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    • pp.515-522
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    • 1995
  • The effects of the thyroid hormone ($T_3$) on 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activity were evaluated in a baby hamster kidney cell line, C100. The cells cultured in MEM were supplemented with 10% thyroid hormone-depleted fetal bovine serum (THDS-MEM) and had a 82.5% lower level of HMG-CoA reductase activity than the cells grown in a medium supplemented with fetal bovine serum (FBS-MEM). When $T_3$ was supplemented to THDS-MEM, the reduction of the reductase activity was blocked in a dose-dependent manner. In the cells grown in THDS-MEM containing $T_3$ at a concentration of $10^{-6}$ M, the level of HMG-CoA reductase activity was 91.8% relative to the cells grown in FBS-MEM. These changes in HMG-CoA reductase activity seemed to be at least partly due to the changes of HMG-CoA reductase mRNA levels. The level of HMG-CoA reductase mRNA in cells incubated in THDS-MEM decreased to 76.2% relative to the cells grown in FBS-MEM, while the level of reductase mRNA in cells incubated in THDS-MEM containing $T_3$ at a concentration of $10^{-6}$ M increased to 243.4% relative to the cells grown in FBS-MEM. The increase of HMG-CoA reductase mRNA level after $T_3$ treatment may have been due to the increased stability of reductase mRNA, because the transcriptional rate of the reductase gene did not change significantly in the presence or absence of $T_3$. These results indicate that $T_3$ stabilizes HMG-CoA reductase mRNA at the posttranscriptional level and regulates HMG-CoA reductase activity in a dose-dependent manner.

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Regulation of HMG-CoA Reductase mRNA Stability by 25-hydroxycholesterol

  • Park, Jae-Won;Oh, Seung-Min
    • Preventive Nutrition and Food Science
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    • 제5권4호
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    • pp.184-188
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    • 2000
  • HMG-CoA reductase is th rate-limiting enzyme of cholesterol biosynthesis. As intracellular levels of cholesterol should be regulated elaborately in response to external stimuli an internal needs, the expression of the HMG-CoA reductase gene is regulated intricately at several different levels from transcription to post-translational modification. In this study, we investigated the regulatory mechanism of HMG-CoA reductase gene expression at the post-transcriptional/pre-translational levels in a baby hamster kidney cell line, C100. when 25-hydroxycholesterol was added to cells cultured in medium containing 5% delipidized fetal bovine serum and 25$\mu$M lovastatin, the levels of HMG-CoA reductase mRNA decreased rapidly, which seemed to be due to the increased degradation of reductase mRNA. These suppressive effects of 25-hydroxycholesterol on MG-CoA reductase mRNA levels were blocked by a translation inhibitor, cycloheximide. Similarly, actinomycin D and 5,6-dichloro-1-$\beta$-D-ribofuranosylbenzimidazole, transcription inhibitors, blocked the 25-hydroxycholesterol-mediated degradation of HMG-CoA reductase mRNA. These results indicate that new protein/RNA synthesis is required for the degradation of HMG-CoA reductase mRNA. In addition, data from the transfection experiments shows that cis-acting determinants, regulating the stability of reductase mRNA, were scattered in the sequence corresponding to 1766-4313 based on the sequence of Syrian hamster HMG-CoA reductase cDNA. Our data suggests that sterol-mediated destabilization of reductase mRNA might be one of the important regulatory mechanism of HMG-CoA reductase gene expression.

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THE EFFECT OF DIETARY FATS ON THE HEPATIC AND INTESTINAL 3-HYDROXY-3-METHYLGLUTARYL COENZYME A REDUCTASE ACTIVITIES IN CHICKS

  • Youn, B.S.;Tananka, K.;Ohtani, S.;Santoso, U.
    • Asian-Australasian Journal of Animal Sciences
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    • 제6권2호
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    • pp.281-290
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    • 1993
  • This experiment was designed to evaluate the effect of degree of unsaturation (Experiment 1) and the chain length of constituent fatty acids of dietary fats (Experiment 2) on-3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase activities in the liver and small intestine of chicks. Chicks were fed experimental diets for 10 days and then killed for the determination of the HMG-CoA reductase activities in the intestinal epithelial cell and hepatic microsomes. The hepatic HMG-CoA reductase activity showed the highest value in chicks fed the tallow-containing diet. Chicks fed diets containing safflower or coconut oil resulted in a significantly lower intestinal HMG-CoA reductase activity in comparison with those fed the olive oil-containing diet. The hepatic HMG-CoA reductase activity was significantly higher when fat-free and trilaurin were fed than when any other triglycerides were fed. This activity showed the lowest value in the chicks fed the diet containing tristearin. The HMG-CoA reductase activities in the jejunum and ileum were significantly or tended to be higher when trilaurin was fed than when any other triglycerides were fed. Except when trilaurin was fed, the presence of saturated fat in the diet did not have a significant effect on the intestinal HMG-CoA reductase activity, unlike the effect shown when a highly unsaturated fat was added to the diet. There was no significant correlation between the HMG-CoA reductase activities of the liver and intestinal, and the HMG-CoA reductase activity and cholesterol content of the intestinal epithelial cells.

Bacillus cereus D-3로부터 항고지혈증 HMG-CoA Reductase 저해제의 생산 (Production of an Antihyperlipemial HMG-CoA Reductase Inhibitor from Bacillus cereus D-3)

  • 이대형;이재원;정재홍;이종수
    • 한국미생물·생명공학회지
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    • 제34권1호
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    • pp.52-57
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    • 2006
  • 새로운 고지혈증 예방 제품 개발을 위한 기초 자료를 얻고자 우선 전통 된장으로부터 HMG-CoA reductase 저해 물질을 강력하게 세포외로 생산하는 D-3 세균을 최종 분리 하였다. D-3 균의 미생물학적 특성을 조사한 결과 그람양성의 간균으로 운동성이 있었고 통성 혐기성이였다. 이들 특성과 16S rRNA 염기서열의 분석 결과 등을 종합하여 Bergey's manual로 동정한 결과 Bacillus cereus D-3로 동정되었다. HMG-CoA reductase 저해물질 생산 최적 조건을 조사한 결과 Bacillus cereus D-3를 glucose 2%, corn steep liquor $0.6%,\;K_{2}HPO_4\;0.04%,\;KH_{2}PO_4\;0.05%$를 함유한 Glucose-CSL 배지에 접종하여 $30^{\circ}C$에서 36시간 배양하여 얻은 상등액의 HMC-CoA reductase 저해활성이 39.4% 저해물질을 가장 많이 생성 하였다.

곡류 및 두류 추출물로 부터 HMG-CoA reductase 저해활성 검색 (Screening of HMG-CoA Reductase Inhibitory Activity of Ethanol and Methanol Extracts from Cereals and Regumes)

  • 하태열;조일진;이상효
    • 한국식품과학회지
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    • 제30권1호
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    • pp.224-229
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    • 1998
  • 국내산 곡류의 에탄올 및 메탄올 추출물로부터 콜레스테롤 생합성계에서 가장 중요한 율속효소로 알려져 있는 HMG-CoA reductase 저해활성을 검색하였다. HMG-CoA reductase activity 측정용 효소원은 cholestyramin을 급여하여 사육 한 후 밤 12시경에 간율 적출하여 얻어진 microsome을 freeze-thaw방법으로 조제하였고 효소활성은 spectrophotometric assay로 측정하였다. 그 결과 각 시료 추출물을 $100{\;}{\mu}g/assay$ 되게 첨가한 경우 HMG-CoA reductase 억제활성은 에탄올 추출물에서는 수수가 가장 높은 활성을 보였고 다음은 흑임자였으며 나머지는 활성이 미미하거나 전혀 없는 것으로 나타났다. 메탄올 추출물에서는 기장이 가장 높은 활성을 나타내었고 다음은 수수였으며 그 다음은 메밀, 흑미의 순으로 나타났다. 또한 추출물에서 높은 억제활성을 나타내었던 수수와 기장 메탄올 추출물을 각종 용매로 분획하여 활성을 검토한 결과 수수와 기장 모두 헥산 획분에서 가장 높은 활성을 나타내었다.

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플라보노이드 화합물로부터 HMG-CoA reductase 저해 활성 물질 탐색 (Screening of Flavonoid Compounds with HMG-CoA Reductase Inhibitory Activities)

  • 손건호;이주연;이정순;강삼식;손호용;권정숙
    • 생명과학회지
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    • 제28권2호
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    • pp.247-256
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    • 2018
  • 심혈관계 질환은 질환별 사망률 순위에 있어서 세계에서는 1위이며, 우리나라에서는 2위인 질병이다. 심혈관계 질환 발생의 주 위험 요인인 콜레스테롤은 HMG-CoA reductase에 의해 간에서 신생합성이 조절된다. 현재 고콜레스테롤혈증 치료에 statin이 널리 사용되고 있지만 광범위한 부작용이 보고되고 있어서 이를 대체하거나 보조할 수 있는 천연물 유래의 기능성 물질 개발이 필요한 실정이다. 따라서 본 연구에서는 혈장 콜레스테롤 감소 활성을 가지는 물질을 발굴하고자 98종의 플라보노이드 및 그와 관련된 화합물들을 대상으로 $10{\mu}g/ml$ 농도에서 HMG-CoA reductase 저해 활성을 탐색하였다. 그 결과, sophoraflavanone G, morin, 및 kuraridin이 각각 54.6%, 45.04% 및 21.9%의 저해활성을 타내었으며, $IC_{50}$값을 계산한 결과, sophoraflavanone G가 $7.3{\mu}g/ml$로 가장 낮았으며 morin과 kuraridin은 각각 $13.3{\mu}g/ml$$87.4{\mu}g/ml$으로 확인되어, 향후 고콜레스테롤혈증 예방 및 치료제의 가능성을 제시하였다.

HMG-CoA Reductase의 저해제 탐색과 가금의 콜레스테를 저하 효과 (Screening of 3-Hydroxy-3-Methylglutaryl-Coenzyme A Reductase Inhibitors In Vitro and Its Application to Pullets)

  • Moon, Young-Ja;Yeom, Keum-Hee;Sung, Chang-Keun
    • 한국식품영양학회지
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    • 제15권4호
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    • pp.307-313
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    • 2002
  • 체내 cholesterol 수치를 낮추기 위하여 HMG-CoA reductase 활성을 저해하는 물질들을 닭에게 급여하여 in vitro상에서 검토한 결과, HMG-CoA reductase 활성에 대한 마늘, lovastatin과 copper의 순으로 저해능은 51.3%, 87.5%, 82.0%이었다. 또한 혈장, 가슴조직, 간장의 cholesterol 함량에 대한 마늘(3% in diet), lovastatin(300mg/Kg of diet), copper(200mg/Kg of diet)의 효과를 검토하였다. 혈장 중의 cholesterol 함량과 HDL, LDL cholesterol 함량은 3% 마늘의 투여로 감소되어졌으나 copper의 투여는 오히려 증가하였고, lovastatin 투여에 의한 차이는 나타나지 않았다. 그리고 간장과 가슴조직의 cholesterol과 triglyceride는 사료에 cholestrol의 수치를 저하시키는 물질을 첨가하였으나 별다른 차이가 없었다.

Synthesis and Biological Activity of Indazole-Derived HMG-CoA Reductase Inhibitors

  • Kim, Jin-Il;Jahng, Yurng-Dong
    • Archives of Pharmacal Research
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    • 제18권3호
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    • pp.206-212
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    • 1995
  • New hypolipaemic agents, in which substituted indazole nucleus is connected to tetrahydro-4-hydroxy-2H-pyran-2-one by a two-carbon bridge, were designed and synthesized to show significant inhibitory activity against microsomal HMG-CoA reductase in rat liver.

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