• 제목/요약/키워드: DMH

검색결과 57건 처리시간 0.026초

쥐에서 식이에 첨가한 n-3 PUFA함량에 따라 대장 암화과정에 미치는 영향 (Effect of Different Amount of Dietary n-3 PUFA on Colon Carcinogenesis in DMH-treated Rats)

  • 박현서;곽혜경;김민석
    • Journal of Nutrition and Health
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    • 제38권10호
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    • pp.807-816
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    • 2005
  • 본 연구에서는 Sprague Dawley종 수컷 쥐에서 DHM로 대장암을 유발시킨 후 식이에 첨가한 n-3 RUFA 함량에 따라 대장의 암화과정에 어떤영향을 미치는지 생화학적인 기전을 검토하여 다음과 같은 결과를 얻었다. 1) 식이에 n-3 RUFA를 6.2 mmole 첨가하여 먹인 경우에는 COX-2의 mRNA와 단백질의 발현 및 TBX2와 PGE2 합성이 유의하게 감소 되었으며, 이에 따라 세포증식도 억제되었다. 그러나 n-3 RUFA를 12.4 mmole 첨가한 식이로 사육한 경우에는 오히려 COX-2의 mRNA와 단백질의 발현 및 $TXB_2$$PGE_2$ 합성이 대조군 보다도 더 많이 증가되었고 세포증식도 대조군과 같은 수준으로 증가하여 암화과정을 촉진하였다. 2) 식이에 n-3 PUFA를 6.2 mmole 첨가한 경우 대장 점막의 인지질의 지방산조성중 arachidonic 함량은 유의하게 낮았고, EPA와 DHA 함량은 유의하게 높았으며 n-3 PUFA를 12.4 mmole 첨가한 경우에는 EPA와 DHA 함량은 2배 이상 유의하게 더 높았다. 3) 대장 상피세포의 apoptosis는 식이에 n-3 PUFA를 첨가한 함량과는 관계없이 대조군에 비해 유의하게 약 34$\sim$$42\%$ 증가하였다. 4) 식이에 n-3 PUFA를 6.2 mmole 첨가하였을 때 Bax의 mRNA와 단백질 발현은 각각 유의하게 증가되었으나 n-3 PUFA를 12.4mmole 첨가한 경우에는 유의하게 감소되었다. 반면에Bcl-2의 mRNA와 단백질 발현은 n-3 PUFA 6.2 mmole 첨가한 경우에는 오히려 증가하였다. 총괄해서 본 연구결과에 의하면 항암효과가 있가도 알려진 n-3 PUFA는 식이에 첨가한 함량에 따라 암화과정에 미치는 효과가 다르게 나타났다, 그러므로 앞으로 대장의 암화과정을 억제시키는 n-3 PUFA의 적절량 또는 섭취의 한계치를 정하는 연구가 필요하다고 본다.

SUPPRESSION BY CHLOROPHYLL, BUT PROMOTION BY CHLOROPHYLLIN, OF COLON CARCINOGENESIS IN THE FISHER 344 RAT

  • Blum, Carmen A.;Xu, Meirong;Orner, Gayle A.;Diaz, G.Dario;Li, Qingjie;Bailey, George S.;Dashwood, Roderick H.
    • 한국독성학회:학술대회논문집
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    • 한국독성학회 2001년도 International Symposium on Dietary and Medicinal Antimutgens and Anticarcinogens
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    • pp.48-49
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    • 2001
  • The carcinogens 2-amino-3-methylimidazo[4, 5-f]quinoline (IQ) and 1, 2-dimethylhydrazine (DMH) induce colon tumors in the Fisher 344 rat that contain mutations in Ctnnbl, the gene for b-catenin, but the pattern of mutation differs from that found in human colon cancers. In both species, mutations affect the glycogen synthase kinase 3$\beta$ (GSK-3$\beta$) consensus region of $\beta$-catenin, but whereas they directly substitute critical Ser/Thr phosphorylation sites in human colon cancers, the majority of mutations cluster around Ser$_{33}$ in the rat tumors.(omitted)d)

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SUPPRESSION BY CHLOROPHYLL, BUT PROMOTION BY CHLOROPHYLLIN, OF COLON CARCINOGENESIS IN THE FISHER 344 RAT

  • Blum, Carmen A.;Xu, Meirong;Orner, Gayle A.;Diaz, G.Daria;Li, Qingjie;Bailey, George S.;Dashwood, Roderick H.
    • 한국독성학회:학술대회논문집
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    • 한국독성학회 2001년도 International Symposium on Effects of Edible Phytochemicals and Their Synthetic Derivatives on Carcinogenesis and Mutagenesis
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    • pp.5-6
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    • 2001
  • The carcinogens 2-arnioo-3-methylimidazo[4,5-f]quinoline (IQ) and 1,2-dimethylhydrazine (DMH) induce colon tumors in the Fisher 344 rat that contain mutations in Ctnnb1, the gene for b-catenin, but the pattern of mutation differs from that found in human colon cancers. in both species, mutations affect the glycogen synthase kinase 3$\beta$ (GSK-3$\beta$) consensus region of $\beta$-catenin, but whereas they directly substitute critical Ser/Thr phosphorylation sites in human colon cancers, the majority of mutations cluster around Ser$^{33}$ in the rat tumors.(omitted)

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디지털 현미경 홀로그래피 기법을 이용한 마이크로 액체 제트 유동에 관한 실험적 연구 (Experimental Study on the Characteristics of Micro Jet Flow Using Digital Microscopic Holography)

  • 이한얼;이재호;신원규
    • 한국가시화정보학회지
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    • 제16권1호
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    • pp.48-53
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    • 2018
  • In this study, the effect of injection pressure on the column diameter and droplet velocity of liquid jet with the weakly turbulent Rayleigh-like breakup mode is experimentally studied using digital microscopic holography (DMH). The injection nozzle has the diameter of $50{\mu}m$ and injection pressure is varied from 0.1 to 0.4 MPa. When the micro liquid jet is injected into still air, the double-pulsed holograms was recorded on a CCD sensor and numerically reconstructed in order to obtain well focused images. In this study, the liquid column diameter from $50{\mu}m$ orifice nozzle is shown to be changed slightly but the droplet velocity is increased proportionally as the injection pressure is increased.

인지-감성소구의 광고평가에 대한 사전지식과 관여도의 상대적 역할 (The Relative Role of Prior Knowledge and Involvement on Cognitive-Affective Advertising Evaluation)

  • 황윤용;나광진
    • Asia Marketing Journal
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    • 제4권2호
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    • pp.104-132
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    • 2002
  • 본 연구는 소비자들의 광고평가과정을 정보처리능력의 관점인 사전지식과 정보처리동기의 관점인 관여도의 조절적 역할을 고려하여 검토하였다. 이를 위하여 본 연구에서는 인지자극과 감정자극이 동시에 제공된 광고에 대하여 소비자들의 인지적, 감정적, 행동의욕적 평가관계를 구조적으로 살펴보고, 이를 바탕으로 각 구조적 관계들을 사전지식수준과 관여도수준에 따라 그 상대적 역할들을 살펴보았다. 실증분석결과 본 연구는 기존의 DMH 모델을 지지하는 것으로 나타났으며, 특히 광고에 대한 감정적 평가(Aad)에서 상표에 대한 인지적 평가(Cb)통해 상표에 대한 감정적 평가(Ab)에 미치는 영향력의 정도는 관여도보다는 사전지식이 더 큰 역할을 하는 것으로 나타났다. 또한 광고에 대한 감정적 평가(Aad)에서 상표에 대한 감정적 평가(Ab) 그리고 상표에 대한 감정적 평가(Ab)에서 상표에 대한 행동의욕적 평가(Ib)로의 영향력은 관여도가 중요 조절변수임을 확인하였다.

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항 Histamine제와 Muscarinic Receptor와의 상호작용(II) -대뇌 Muscarinic $M_1$ Receptor에 대한 작용- (Interaction of Antihistaminics with Muscarinic Receptor(II) -Action on the cerebral muscarinic $M_1$ Receptor-)

  • 이신웅;박영주;박인숙;이정수
    • 약학회지
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    • 제34권4호
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    • pp.224-237
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    • 1990
  • A single uniform population of specific, saturable, high affinity binding site of $[^3H]QNB$ guinuclidinyl benzilate(QNB) was identified in the rat cerebral microsomes. The Kd value(37.2 pM) for $[^3H]QNB$ calculated from the kinetically derived rate constants was in agreement with the Kd value(48.9 pM) determined by analysis of saturation isotherms at various receptor concentrations. Dimenhydrinate(DMH), histamine $H_1-blocker$, increased Kd value for $[^3H]QNB$ QNB without affecting the binding site concentrations and this effect resulted from the ability of DMH to slow $[^3H]QNB-receptor$ association. Pirenzepine inhibition curve of $[^3H]QNB$ binding was shallow(nH = 0.52) indicating the presence of two receptor subtypes with high ($M_1-site$) and low($M_2-site$) affinity for pirenzepine. Analysis of these inhibition curves yielded that 68% of the total receptor populations were of the $M_1-subtype$ and the remaining 32% of the $M_2-subtype$. Ki values for the $M_1-$ and $M_2-subtypes$ were 2.42 nM and 629.3 nM, respectively. Ki values for $H_1-blockers$ that inhibited $[^3H]QNB$ binding varied with a wide range ($0.02-2.5\;{\mu}M$). The Pseudo-Hill coefficients for inhibition of $[^3H]QNB$ binding by most of $H_1-blockers$ examined except for oxomemazine inhibition of $[^3H]QNB$ binding were close to one. The inhibition curve for oxomemazine in competition with $[^3H]QNB$ was shallow(nH = 0.74) indicating the presence of two receptor populations with different affinities for this drug. The proportion of high and low affinity was 33:67. The Ki values for oxomemazine were $0.045{\pm}0.016\;{\mu}M$ for high affinity and $1.145{\pm}0.232\;{\mu}M$ for low affinity sites. These data indicate that muscarinic receptor blocking potency of $H_1-blockers$ varies widely between different drugs and that most of $H_1-blockers$ examined are nonselective antagonist for the muscarinic receptor subtypes, whereas oxomemazine might be capable of distinguishing between subclasses of muscarinic receptor.

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Schiff-염기인 옥타아자-거대고리 리간드의 UO2(VI), Th(IV), ZrO(IV) 및 VO(IV) 착물 합성 및 특성 (Synthesis and Characterization of UO2(VI), Th(IV), ZrO(IV) and VO(IV) Complexes with Schiff-Base Octaazamacrocyclic Ligands)

  • Mohapatra, Ranjan Kumar;Dash, Dhruba Charan
    • 대한화학회지
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    • 제54권4호
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    • pp.395-401
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    • 2010
  • [M(L/L')$(NO_3)_n$].$mH_2O$ 및 [VO(L/L')($SO_4)$].$2H_2O$ (여기서 L/L'는 Schiff 염기로 thiocarbohydrazide (TCH), benzilmonohydrazone (BMH)/diacetylmonohydrazone (DMH) 및 carbon disulphide에서 유도된 "3,4,10,11-tetraphenyl/tetramethyl-1,2,5,6,8,9,12,13-octaazacyclotetradeca-2,4,9,11-tetraene-7,14-dithione")의 분자식을 갖는 일련의 거대고리 착물을 (M = $UO_2$(VI), Th(IV) and ZrO(IV), n = 2, 4, m = 2, 3)을 금속이온 주형법으로 합성하였다. 이들 착물의 특성을 원소분석, 열분석, 몰 전기전도도, 자기모멘트 그리고 전자, 적외선 및 $^1H$-NMR로 조사하였다. 바나딜 착물의 경우 ESR 및 순환 전압전류법을 사용하였다. 그 결과, VO(IV) 이온은 5배위의 상자기성 착물을 이루며, $UO_2$(VI) 및 ZrO(IV)는 6배위 그리고 Th(IV)는 8배위를 가지나 공통적으로 위의 조성을 갖는 반자기성임을 알았다.

Effects of Dietary Fats and Fibers on Modulation of Biomarkers and Tumor Incidence in Rats during 1, 2-Dimethylhydrazine-Induced Colon Carcinogenesis

  • Park, Joo-Sun;Park, Hyun-Suh
    • Nutritional Sciences
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    • 제4권2호
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    • pp.73-78
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    • 2001
  • This study investigated the effect of different dietary fats and fibers on colon tumor incidence and cell proliferation, the levels of eicosanoids and polyamines in colonic mucosa of DMH-treated rats. The experiment was conducted on male Sprague Dawley rats using a 2 $\times$3 factorial design with two fats (corn oil and DHA-rich fish oil) and two fibers (cellulose and pectin) and a fiber-free control. The rats were find an experimental diet containing 15% (w/w) dietary fat and 6% (w/w) fiber for 25 weeks. Tumor incidence was Bower in rats fed fish oil as opposed to corn oil. The levels of arachidonic acid (AA) and eicosanoids ($PGE_2, and TXB_2$) in normal colonic mucosa were significantly lower in rats fed fish oil and there was a concomitant increase of docosahexaenoic acid (DHA). The levels of eicosanoids and AA in tumor tissues were significantly higher than those of normal colonic mucosa. The level of polyamines in normal colonic mucosa was not affected by dietary fats but was significantly lower than that in rumor tissues. Dietary fiber did not have a significant effect on rumor incidence and the levels of AA, eicosanoids and polyamines. Overall, fish oil rich in DHA reduced cell prolifiration and thus inhibited colon carcinogenesis through its effect on the distribution of AA and production of eicosanoids in normal colonic mucosa. However, its effect on colon carcinogenesis revealed a lack of consistency depending on the type of dietary fiber in diet.

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