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인간 기도 상피세포에서 증가된 뮤신 생성에 대한 쿠마린과 인도메타신의 억제작용
이재우(Jae Woo Lee),김길동(Kil-Dong Kim),전병규(Byeong Kyou Jeon),이충재(Choong Jae Lee) 대한약학회 2010 약학회지 Vol.54 No.5
We examined whether indomethacin, noscapine, coumarin, uridine and betaine affect airway mucin production induced by EGF or TNF-α from NCI-H292 cells. Cells were pretreated with each agent for 30 min and then stimulated with EGF or TNF-α for 24 h. Of the five compounds, coumarin suppressed airway mucin production induced by EGF or TNF-α. However, indomethacin suppressed airway mucin production induced by EGF. This result suggests that coumarin and indomethacin can regulate the production of mucin induced by EGF, by directly acting on airway epithelial cells.
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Bifidobacterium bifidum에서 리팜피신에 대한 내성기전
정영자(Young Ja Chung),박성수(Seong Soo Park),백문창(Moon Chang Baek),김병각(Byong Kak Kim),최응칠(Eung Chil Choi) 대한약학회 1998 약학회지 Vol.42 No.2
Bifidobacterium bifidum OFR9 that exhibits acquired resistance to rifampicin and fluoroquinolones was selected by MNNG and multi-step mutation method. To investigate the resistance mechanism to rifampicin in the strain, RNA polymerase from B. bifidum parent strain and rifampicin-resistance OFR9 was partially purified and its sensitivity to rifampicin was assayed. The profile of RNA polymerase preparation of B. bifidum parent and B. bifidum OFR9 is similar to that of E. coli RNA polymerase that includes the basic subunits of beta`, beta, sigma, alpha but which are a little different in size when they are compared with E. coli RNA polymerase subunits. RNA polymerase isolated from the parent strain was inhibited by 1mcg/ml rifampicin but that from B. bifidum OFR9 was not affected by 100mcg/ml concentration of rifampicin. RNA polymerase activity of B. bifidum OFR9 was maintained over 90% through that rifampicin concentration. This result is consistent with MIC values of in vitro test. It can be concluded that the mechanism of rifampicin resistance in B. bifidum OFR9 is due to an alteration of RNA polymerase.
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3,4,5-Trihydroxybenzoic Acid Methylester와 관련 화합물의 피부암 및 구강암 세포주에 대한 세포독성
이재숙(Jae Sug Lee),한두석(Du Seok Han),강정일(Jeong Il Kang),백종민(Jong Min Baek),백승화(Seung Hwa Baek) 대한약학회 2010 약학회지 Vol.54 No.2
The cytotoxic activity of 33,4,5-trihydroxybenzoic acid methylester and related compounds on the growth of normal cell lines, human skin melanoma cells and human oral epithelioid cell line were evaluated by the 3-[4,5-dimethylthiazol- 2-yl]-2,5-diphenyltetrazolium bromide (MTT) and 2,3-bis-[2-methoxy-4-nitro-5-sulfo-phenyl]-2-H-tetrazolium-5-caboxanilide (XTT) methods. 3,4,5-Trihydroxybenzoic acid methylester decreased the cell viability of human skin melanoma cells and human oral epithelioid cells shown by the MTT method and the cell adhesion activity of human skin melanoma cells and human oral epithelioid cells shown by the XTT method. In light microscopy, 100 μM 3,4,5-trihydroxybenzoic acid methylester showed the highest cytotoxic activity. These results suggest that 3,4,5-trihydroxybenzoic acid methylester has a potential anticancer activity.
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Quercetin에 의한 혈관이완효과에 대한 알코올의 추가적인 역할
진영배(Youngbae Jin),제현동(Hyun Dong Je) 대한약학회 2010 약학회지 Vol.54 No.5
The aim of present study was to investigate the possible influence and related mechanism of additional alcohol on the flavonoid- induced arterial relaxation. Agonist-induced vascular smooth muscle contractions involve the activation of thick or thin filament pathway. However, there are no reports addressing the question whether this pathway is involved in quercetin-induced relaxation cotreated with alcohol in rat aortae contracted with phorbol ester, fluoride or thromboxane A2 mimetic U-46619. We hypothesized that cotreated alcohol plays a role in vascular relaxation evoked by quercetin in rat aortae. Endothelium-denuded arterial rings from male Sprague-Dawley rats were used and isometric contractions were recorded using a computerized data acquisition system. Quercetin inhibited phorbol ester, fluoride or thromboxane A2-induced contraction regardless of endothelial function. However, alcohol didn't decrease any agonist-induced contraction. Interestingly, only in thromboxane A2-induced contraction, synergistic results were observed in aortae denuded and cotreated with quercetin and alcohol suggesting that additional pathways different from antioxidation or endothelial nitric oxide synthesis might be involved in the vasorelaxation. In conclusion, in the agonists-contracted rat aortae, quercetin and alcohol together showed synergistic response regardless of endothelial function in an agonist-dependent manner.
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