• 제목/요약/키워드: HT9

검색결과 451건 처리시간 0.034초

감광성 PVA 박막을 이용한 P3HT 유기박막트랜지스터의 포토리소그래피 패터닝과 패시베이션 (Photolithographic patterning and passivation of P3HT organic thin film transistors with photo-sensitive polyvinylalcohol(PVA) layers)

  • 남동현;한교용
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.191-191
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    • 2007
  • By employing a photo-sensitive PVA as a photoresist, we first demonstrated simultaneous patterning and passivation of P3HT active layer. The passivation layers were obtained by annealing the organic layers after developing PVA and over-etching the P3HT layer. The fabricated OTFTs were electrically characterized. The OTFTs after the passivation exhibited the field-effect of ${\sim}5.9{\times}10^{-4}cm^2/V{\cdot}s$, on/off current ratio of ${\sim}10^3$. The value of OTFTs a little degradation with time in air but it appeared different unpassivated OTFT.

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Effect of ${\gamma}$-mangostin through the inhibition of 5-hydroxytryptamine$_{2A}$ receptors in 5-fluoro-${\alpha}$-methyltryptamine-induced head-twitch responses of mice

  • Nattaya Chairungsrie;Furukawa, Ken-Ichi;Takeshi Tadano;Kensuke Kisara;Yasushi Ohizumi
    • 한국응용약물학회:학술대회논문집
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    • 한국응용약물학회 1998년도 Proceedings of UNESCO-internetwork Cooperative Regional Seminar and Workshop on Bioassay Guided Isolation of Bioactive Substances from Natural Products and Microbial Products
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    • pp.170-170
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    • 1998
  • In order to discover new types of 5-hydroxytryptamine antagonists, we have devoted our attention to investigating naturally occurring compounds having anti-5HT activity in vitro. Recently, ${\gamma}$-mangostin [1,3,6,7-tetrahydroxy-2,8-bis(3-methyl-2-bytenyl)-9H-xanthen-9-one] from the fruit hull of Garcinia mangostana Linn has been shown to be a selective antagonist for 5-hydroxytryptamine$_{2A}$ receptors in smooth muscle and platelets. It is of interesting that y-mangostin which does not have a nitrogen atom, possesses marked 5-$HT_{2A}$ receptor blocking activity. The present study was undertaken to investigate the effects of ${\gamma}$-mangostin on central 5-HT receptors by using animal behavioural models. Intracerebronventricular injection of ${\gamma}$-mangostin (10-40n mol/mouse) inhibited 5-fluoro-${\alpha}$-methyltryptamin (5-FMT) (45 mg kg$^{-1}$, i.p.)-induced head-twitch response in mice in the presence or absence of citalopram (5-HT-uptake inhibitor). Neither the 5-FMT- nor the 8-hydroxy-2-( di-n-propylamino )tetralin (5-HT$_{1A}$-agonist)-induced 5-HT syndrome (head weaving and hindlimb abduction) was affected by ${\gamma}$-mangostin. The locomotor activity stimulated by 5-FMT through the activation of at-adrenoceptors did not alter in the presence of ${\gamma}$-mangostin. 5-HT-induced inositol phosphates accumulation in mouse brain slices was abolished by ketanserin. ${\gamma}$-Mangostin caused a concentration-dependent inhibition of the inositol phosphates accumulation and the binding of [$^3H$]-spiperone, a specific 5-$HT_{2A}$ receptor antagonist, to mouse brain membranes. Kinetic analysis of the [$^H3$]-spiperone binding revealed that ${\gamma}$-mangostin increased the $_{d}$ value without affecting the $B_{max}$ value, indicating the mode of the competitive nature of the inhibition by ${\gamma}$-mangostin. These results suggest that ${\gamma}$-mangostin inhibits 5-FMT-induced head-twitch response in mice by blocking 5-$HT_{2A}$ receptors not by blocking the release of 5-HT from the central neurone. ${\gamma}$-Mangostin is a promising 5-$HT_{2A}$ receptors antagonist in the central nervous system.m.

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Construction of a High-efficiency Shuttle Vector Containing the Minimal Replication Origin of Bacillus thuringiensis

  • Kang Joong Nam;Kim Yang-Su;Wang Yong;Choi Heekyu;Li Ming Shun;Shin Sang Chul;Jin Byung Rae;Roh Jong Yul;Choi Jae Young;Je Yeon Ho
    • International Journal of Industrial Entomology and Biomaterials
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    • 제11권2호
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    • pp.125-127
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    • 2005
  • In order to improve the transformation efficiency of the Bacillus thuringiensis (Bt)-Escherichia coli (E. coli) shuttle vector, pHT3101, we intended to minimize replication origin of Bt in pHT3101. For this, two modified shuttle vectors, pHT1K and pHT261, in which 2.9 kb of replication origin of Bt were shortened to 1 kb and 261 bp, respectively as previously reported. Whereas the pHT1K could efficiently transform Bt into the antibiotic resistant, no transformants were obtained with pHT261. Furthermore, pHT1K showed higher transformation efficiency compared to that of parent vector, pHT3101. Therefore, pHT1K might be a very useful Bt-E. coli shuttle vector carrying minimal replication origin of Bt.

지모(知母)에탄올추출물의 HT-29대장암세포 Apoptosis 유도효과 (Effect of Anemarrhenae Rhizoma Ethanol Extract on Apoptosis Induction of HT-29 Human Colon Cancer Cells)

  • 김태현;김범호;전병국;윤정록;우원홍;문연자;이장천;이부균;박영규;임규상
    • 한방안이비인후피부과학회지
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    • 제24권1호
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    • pp.16-24
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    • 2011
  • Objective : In this study, we investigated the effects of ethanol extract of Anemarrhenae Rhizoma (EAR) on the proliferation and apoptosis induction of HT-29 human colon cancer cells. Methods : Cell viability of HT-29 cells were measured by MTT assay and apoptisis-related proteins were assessed using western blotting. Chromatin condensation of HT-29 cells stained with Hoechst 33258. Results : In the present study, we demonstrated that EAR exhibited significant cytotoxicity in HT-29 cells. The induction of apoptosis in HT-29 cells by EAR treatment was characterized by chromatin condensation and the activation of caspase-3. EAR-induced apoptosis is accompanied by the release of cytochrome c and the specific proteolytic cleavage of PARP. EAR was appeared cytotoxic effect to HT-29 cells in a dose-dependent manner. Concomitantly, EAR treatment led to increase in the caspase-9. The reduction of Bcl-2 and truncation of Bid were induced by EAR. Conclusion : We studied that the EAR induced apoptosis in human colon adenocarcinoma HT-29 cells. These results indicated that EAR can cause apoptosis through mitochondria/caspase pathway in human HT-29 cells.

갯메꽃 추출물과 유기용매 분획물의 암전이 억제 효과 (Anti-invasion Effects of Calystegia soldanella Solvent Extracts and Partitioned Fractions on PMA-stimulated Fibrosarcoma Cells)

  • 손재민;김준세;김호준;서영완
    • 생명과학회지
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    • 제29권3호
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    • pp.287-294
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    • 2019
  • 갯메꽃은 해안 사구에 분포하며 식물로 높은 환경 적응력을 가지고 있으며 갯메꽃은 항산화, 해열, 살균, 이뇨작용 등에 효과가 있는 것으로 알려져 있다. 본 연구에서는 암전이 과정에서 중요한 역할을 한다고 알려진 matrix metalloproteinases (MMPs)의 일종인 MMP-2와 MMP-9의 활성에 대한 갯메꽃의 억제효과를 methylene chloride (MC) 및 methanol (MeOH) 추출물과 조추출물, 유기용매 분획물을 시료로 하여 인체 섬유육종 HT-1080 세포를 이용하여 ELISA (Enzyme-linked immunosorbent), gelatin zymography, Wound healing assay, RT-PCR, western blot 실험을 통해 조사하였다. 갯메꽃의 MC 및 MeOH 추출물, 조추출물과 4가지 유기용매 분획물이 HT-1080 세포에서 MMP-2와 MMP-9 생성 억제 활성을 나타냄을 확인하였다. 그 중에서도 n-hexane, 85% aq.MeOH 분획물이 전반적으로 MMP-2와 MMP-9에 대한 높은 억제활성을 보였다. 이들 결과로부터 85% aq.MeOH과 n-hexane 분획물에 MMP 억제 활성이 높은 물질이 존재할 것으로 추측되어지며, 갯메꽃 추출물 및 분획물이 암침윤 및 전이를 억제하는 효과적인 항암소재로서의 가능성이 있음을 제시한다. 이에 본 연구팀은 85% aq.MeOH과 n-hexane 분획물에 있는 활성물질을 분리하기 위한 연구를 추가적으로 수행할 계획이다.

5-HT 흡수억제성 항우울제들이 가토혈소판의 [$^3H$]Imipramine과 [$^3H$]Paroxetine Binding, [$^3H$]5-HT 흡수, 및 5-HT함량에 미치는 영향 (Effects of Chronic Treatments with 5-HT Uptake Inhibitors on the [$^3H$]Imipraine and [$^3H$]Paroxetine Binding, [$^3H$]5-HT Uptake, and 5-HT Content of the Rabbit Platelet)

  • 원경식;이민수;신경호;전보권;곽동일
    • 생물정신의학
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    • 제1권1호
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    • pp.88-97
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    • 1994
  • Many evidences are compatible with the correlation between the inhibition of [$^3H$] imipramine([$^3H$]IMI) and [$^3H$]paroxetine([$^3H$]PAT) binding to the 5-hydroxytryptamine(5-HT) transporter complex and the 5-HT uptake of 5-HT neurons and platelets, and most antidepressants have been shown to inhibit the [$^3H$]IMI and [$^3H$]PAT binding and the neuronal 5-HT uptake. However, several paradoxical research findings led to doubt about the pharmacological significance of the [$^3H$]IMI and [$^3H$]PAT binding sites. This study was carried to clarify the correlation between the [$^3H$]IMI and [$^3H$]PAT binding parameters and the tissue 5-HT content or/and [$^3H$]5-HT uptake in the rabbit platelet, which contains 40 times ad much 5-HT as that of human platelet and shows the 10 fold higher $B_{max}$ of the 5-HT transporter binding to a 5-HT uptake inhibitor. The rabbits were treated for 28 days with amitriptyline(4mg/kg/day : AP), fluoxetine(0.5mg/kg/day : FO), and sertraline(0.5mg/kg/day : SA) via an Alzet osmotic pump implanted for constant infusion. The [$^3H$]IMI binding $B_{max}$ and $K_d$ of the rabbit platelets were $6.4{\pm}1.2$pmol/mg protein and $10.9{\pm}2.1$nM and those in the [$^3H$]PAT binding were $8.6{\pm}1.1$pmol/mg protein and $1.6{\pm}0.3$nM, respectively. AP slightly increased $B_{max}$ of [$^3H$]IMI binding and both [$^3H$]IMI binding and [$^3H$]PAT binding $K_d$, and i contrast, it slightly decreased $B_{max}$ of [$^3H$]PAT binding. FO Slightly increased $K_d$ of both and [$^3H$]IMI and [$^3H$]PAT binding and slightly decreased $B_{max}$ of [$^3H$]IMI and [$^3H$]PAT binding. SA produced the significant increase of [$^3H$]PAT binding $B_{max}$ and the slight increase of both [$^3H$]IMI and [$^3H$]PAT binding $K_d$ and in contrast, it slightly decreased $B_{max}$ and of [$^3H$]IMI binding. And, the $V_{max}$ and $K_m$ of platelet [$^3H$]5-HT uptake were $24.2{\pm}2.4$pmol/$10^8$ platelets/min and $3.3{\pm}0.3$nM, respectively. The $V_{max}$ was little affected by AP, FO, or SA, but the [$^3H$]5-HT uptake $K_m$ value was moderately increased by FO. However, the platelet 5-HT content was moderately decreased by all of the 5-HT uptake inhibitors used in this study. These results seem to be consistent with the allosterical and competitive interaction of 5-HT uptake inhibiting antidepressants with each other as well as 5-HT in the 5-HT transporter binding, and provide no support for the view that the potencies of 5-HT uptake inhibitors to inhibit the [$^3H$]IMI or [$^3H$]PAT binding with 5-HT transporter complex correlate with their antidepressant potencies.

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Expression of the Type IV Collagenase Genes and ras Oncogene in Various Human Tumor Cell Lines

  • Moon, A-Ree;Park, Sang-Ho;Lee, Sang-Hun
    • BMB Reports
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    • 제29권5호
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    • pp.484-487
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    • 1996
  • The matrix metalloproteinases (MMPs) are members of a unique family of proteolytic enzymes that degrade components of the extracellular matrix. Significant evidence has accumulated to directly implicate members of the MMPs in tumor invasion and metastasis formation. To investigate the correlation between ras oncogene and MMP gene expression in various tumor cells, we detected mRNAs for the ras, MMP-2 and MMP-9 (72 kD and 92 kD type IV collagenases, respectively) genes in nine human tumor cell lines. The ras gene was expressed in seven cell lines; MMP-2 in three; MMP-9 in two cell lines tested. There was no direct correlation between the ras oncogene and MMP expression. A clear difference in the mRNA expression between MMP-2 and MMP-9 was observed among the cell lines. As an approach to study the effect of the ras oncogene on metastasis, we examined the expressions of MMP-2 and MMP-9 in HT1080 cells transfected with the v-H-ras gene. MMP-9 expression was Significantly enhanced in the ras-transfected HT1080 cells compared with the nontransfectants while ras transfection did not affect the expression of MMP-2. These results suggest the possible inducing effect of the ras oncogene on the metastasis by activation of the MMP-9 gene in HT1080.

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당뇨유발 흰쥐에서 돼지감자 여주 혼합즙 음용에 의한 혈당저하 효과 (Effect of Helianthus tuberosus Juice Mixed with Dried Bitter Melon Juice on Hypoglycemic Function in Streptozotocin-Induced Diabetic Rats)

  • 양양;김용훈;황은희
    • 한국식품영양과학회지
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    • 제46권8호
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    • pp.903-909
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    • 2017
  • 식품을 혼합하였을 때 생리 기능 상승효과가 있을 것을 기대하여 돼지감자즙에 건조 여주즙을 5% 혼합하여(돼지감자 여주즙) 일반 영양성분을 알아보았고 streptozotocin(STZ)으로 당뇨를 유발한 흰쥐에 이를 음용수로 4주간 공급하고 혈당지표로서 혈액 포도당 농도 변화, 최종혈당 농도, 경구 당부하 검사, 혈청 인슐린 농도를 실시하였다. 돼지감자 여주즙 100 g당 수분 82.22 g, 열량 67.00 cal, 당류 2.52 g, 탄수화물 15.45 g, 조단백 1.21 g, 조회분 1.02 g, 나트륨 0.49 mg을 함유하였고 포화지방산, 조지질, 콜레스테롤은 검출되지 않았다. 돼지감자 여주즙을 3배의 증류수로 희석하여 4주 동안 음용수로 공급한 흰쥐의 사료 이용효율은 NC군 0.138에 비하여 STZ군은 -0.024~-0.054로 유의적으로 낮았다. 사료섭취량은 적응기간에는 하루 32~34 g이었는데 STZ 투여 1주일 후 NC군의 $38.6{\pm}9.2g$에 비하여 STZ군은 $25.2{\pm}5.4g$으로 실험군별 차이가 컸다. 4주 후에는 NC군의 사료섭취량이 STZ군, HT2.5군, HT5.0군보다 유의적으로 많았다. 흰쥐의 시작 체중은 153.5~163.0 g으로 비슷하였는데 STZ 투여군은 체중이 감소하였다. NC군의 체중은 4주 후 평균 157.0 g 증가하였는데 당뇨유발군들은 4주 동안 체중이 8~44 g 정도 감소하였다. 하루 동안 물 섭취량은 적응 기간에 평균 $75.0{\pm}6.7mL$였는데, STZ 투여 4주 후에는 STZ군이 $159.2{\pm}6.1mL$로 가장 많았고 돼지감자 여주즙군은 NC군보다 많았고 STZ군보다는 적었다. 혈장 포도당의 수준은 NC군의 $113{\pm}4.5mg/dL$에 비하여 STZ 투여 1주일 후 STZ군은 $476.7{\pm}22.8mg/dL$로 약 4배 높았고 HT군은 $376.3{\pm}25.8mg/dL$, HT2.5군은 $405.2{\pm}35.1mg/dL$, HT5.0군은 $342.8{\pm}29.7mg/dL$로 STZ군보다 낮았다. 당부하검사에서 포도당투여 후 120분 동안 혈당을 낮추는 효과가 돼지감자군들에서 컸으며, 돼지감자 여주즙 음용 4주후 흰쥐의 혈청 인슐린분비가 많아졌음을 알 수 있었다. 이상의 결과는 돼지감자 여주즙 음용이 당뇨 개선에 도움이 될 것으로 평가되며 돼지감자의 고부가가치를 높일 수 있을 것으로 기대된다.

대장암세포주 HT29에서의 Treculia africana 추출물의 항산화 및 항암 활성 분석 (Anti-oxidative and Anti-cancer Activities of Treculia africana Extract in Human Colon Adenocarcinoma HT29 Cells)

  • 오유나;진수정;박현진;김병우;권현주
    • 생명과학회지
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    • 제25권5호
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    • pp.515-522
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    • 2015
  • Treculia africana Decne는 빵나무종으로 뽕나무과, Treculia 속에 속하는 식물로서, 이 식물의 다양한 부위에서 추출한 물질은 항염증, 항균등의 효과를 가지고 있어 백일해의 치료등 다양한 질환에서 민간요법으로 사용되어 왔다. 하지만 정확한 생리활성에 관한 연구는 보고된 바가 없다. 따라서 본 연구에서는 T. africana Decne 메탄올추출물(META)을 사용하여 항산화능 및 인체 대장암 세포주인 HT29에 대한 항암활성에 관하여 분석하였다. DPPH radical scavenging activity를 통해 분석한 결과, META의 IC50가 4.53 μg/ml로 강력한 항산화능을 보유하 였음을 확인하였다. 또한 META 처리에 의해 HT29의 생존율이 감소함과 더불어 IC50가 66.41 μg/ml로 강력한 세포사멸효과를 나타냈다. META 처리에 의해 HT29의 subG1 세포비율 및 Annexin V+ 세포의 비율이 증가하고, DAPI로 염색된 apoptotic body가 증가하였다. 또한 apoptosis 관련 단백질인 Fas, Bax, cytochrome c의 발현이 증가하였으며, 이는 caspase 3, 8, 9를 활성화 시켜 최종적으로 PARP가 분해되어 apoptosis가 유도되었음을 확인하였다. 이러한 결과들을 통해 META는 강한 항산화 활성과, 대장암세포에서 apoptosis 유도에 의한 높은 항암활성을 보유한 물질임을 확인하였다.

Julbernardia globiflora 추출물의 항산화 활성 및 인체 대장암 세포 HT29에 대한 항암 활성 분석 (Antioxidative and Anticancer Activities of Julbernardia globiflora Extract in Human Colon Adenocarcinoma HT29 Cells)

  • 오유나;진수정;권현주;김병우
    • 생명과학회지
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    • 제27권5호
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    • pp.545-552
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    • 2017
  • Julbernardia globiflora는 미옴보 숲에 널리 분포하는 열대 아프리카 나무로, 우울증, 위장장애 등의 치료를 위해 민간요법으로 사용되고 있으나, 항산화능, 항암 활성 등에 대한 연구는 알려진 바가 없다. 따라서 본 연구에서는 J. globiflora 메탄올 추출물(MEJG)을 사용하여 항산화능 및 인체 대장암 세포주인 HT29에 대한 항암 활성에 관하여 분석하였다. 먼저 DPPH radical scavenging activity를 통해 분석한 결과, MEJG의 $IC_{50}$$1.23{\mu}g/ml$로 강력한 항산화능을 보유하였음을 확인하였다. 또한 MEJG 농도 의존적으로 HT29 세포의 성장을 억제하였다. MEJG의 HT29 세포 사멸 효과의 기전을 분석하기 위하여 Annexin V 염색과 DAPI 염색을 수행한 결과, 대조군에 비하여 apoptotic 세포 및 apoptotic body가 증가됨을 확인하였다. 또한 apoptosis 관련 단백질들의 발현변화를 분석한 결과, MEJG처리에 의해 사멸수용체인 Fas와 pro-apoptotic 단백질인 Bax의 발현이 증가되었으며, anti-apoptotic 단백질인 Bcl-2의 발현이 감소하였다. 이러한 결과로 cytochrome c가 미토콘드리아에서 세포질로 방출되어 증가되었으며, caspase-3, -8, -9가 활성화되었다. 최종적으로 PARP가 분해되어 apoptosis가 유도되었음을 확인하였다. 이러한 결과들로부터 MEJG는 내인성 및 외인성 경로를 통한 apoptosis 유도에 의하여 HT29 세포의 증식을 억제하는 항암활성을 보유하였음을 확인하였다.