• 한국생물물리학회:학술대회논문집
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• 한국생물물리학회 2002년도 제9회 학술 발표회 프로그램과 논문초록
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• pp.46-46
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• 2002

Cdk5, a neuronal Cdc2-like kinase, exhibits a variety of functions in neuronal differentiation and neurocytoskeleton dynamics as well as neuronal degeneration and cell death. However, its role in retinoic acid (RA)-induced differentiation has not been reported yet. We newly found that RA treatment of SK-N-BE(2)C, human neuroblastoma, increased expression of Cdk5 concomitantly with a neuronal specific activator, p35.(omitted)

• Archives of Pharmacal Research
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• 제27권10호
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• pp.997-1000
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• 2004

A series of 1,3-dioxoindan-2-carboxylic acid arylamides were synthesized and evaluated for in vitro cytotoxicity against four human cancer cell lines (HOP62, SK-OV-3, MD-MB-468 and T- 47D). The most active was compound 3e (1.2 ${\mu}M$ against SK-OV-3 cell line) bearing a 4- methyl substituent.

• Archives of Pharmacal Research
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• 제16권2호
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• pp.155-157
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• 1993

DNA transfection conditions were investigated by calcium phosphate-DNA co-precipitation in SK-N-BE(2)C human neuroblastoma cells. The DNA plasmid of TH2400CAT was used in which rat tyrosine hydroxylase gene was inserted into chloramphenicol acetyltransferase reporter gent. The transfection efficiency was 25-30% and the method was simple and reproducible. So, the method will be a good tool for transient transfection analysis.

• Biomolecules & Therapeutics
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• 제9권3호
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• pp.143-155
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• 2001

Many attention has been focused on developing new chemotherapeutic agents for a treatment of cancer from natural products. From Carpesium divaricatum S. et Z. (Compositae), various monoterpenoid compounds were isolated and exhibited mild antitumor activity against human tumor cell lines. These facts prompted us to explore the structure-activity relationship of these compounds. The synthesis of monoterpenoid compound was accomplished by Fries rearrangement, Grignard reaction, elimination, allylic oxidation, esterification and epoxidation as key steps. The results of in vitro cytotoxicity (A549, SK-OV-3, SK-MEL-2, XF498, HCT15) of the synthesised compounds are as follows: First of all, epoxide moiety is prerequisite for cytotoxic activity in diester compound. Any kind of compounds with olefin or diol moiety instead of epoxide ring exhibited poor or mild cytotoxic activity respectively. Of o-acetoxy and isobutoxy epoxy esters, p-sub-stituted phenylacetate compounds exhibited high cytotoxic activities against SK-MEL-2 and HCT15.

• Biomolecules & Therapeutics
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• 제9권4호
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• pp.249-257
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• 2001

The effect of oxidative stress on the alterations of different antioxidant enzyme activities was investigated in human skin melanoma cell line (SK-MEL-2). Oxidative stress was induced by the exposure to hydrogen peroxide ($H_2O$$_2$). SK-MEL-2 cells were treated with antioxidants such as vitamin E and selenomethionine in combination with $H_2O$$_2$. SK-MEL-$_2$ cells were exposed to various concentrations of $H_2O$$_2$ and measured the time course of changes in cell viability and antioxidant enzyme activities for 24 hr. Oxidative stress was induced by the exposure to 2.5mM hydrogen peroxide ($H_2O$$_2$) resulted in declining significantly for 24 hr. GPX and CAT activities peaked at 3 hr and returned to control levels by 24 hr. On the contrary, SOD activity was inactive before 6 hr but recovered at 24 hr. In case vitamin E (Vit E) and selenomethionine (Se-Met) were used at nontoxic concentrations (25$\mu$M Vit E/500$\mu$M Se-Met) to oxidative stress was induced by the exposure to hydrogen peroxide ($H_2O$$_2$) led to a 3- and 5-fold increase on the viability comparing to control and caused an increase in GPX activity respectively.

• 한국식품과학회지
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• 제34권4호
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• pp.688-693
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• 2002

천연물을 이용하여 생리활성이 있는 성분을 추출 분리하여 그 유효 성분을 탐색함으로써 질병 예방 및 치료제로 이용하고자 하는 연구가 최근 활발히 진행되고 있다. 본 연구에서는 예부터 혈액 순환을 돕고, 지혈 작용에 효과가 있는 것으로 알려져 있는 식탁에 상용되는 야채인 부추를 이용하여 4종의 인체 암세포주인 HepG2, HeLa, MCF7 및 SK-N-MC를 이용하여 암세포 증식억제 및 암예방 QR 유도활성 효과를 측정하였다. MTT assay를 이용한 암세포 증식억제 실험 결과, 4종의 암세포주 모두 ethylether층인 ATMEE에서 아주 높은 농도 의존적이 암세포 증식억제 효과를 보였다. 즉 본 실험에 사용된 인체 암세포주 4종에서 시료의 농도가 $150\;{\mu}g/mL$일 때 각 세포주 모두 약 90% 이상의 높은 암세포 증식억제 효과가 나타났으며, 특히 신경아종세포주인 SK-N-MC 에서는 ethylether층의 시료 농도를 다른 층을 첨가시의 농도보다 적은 $100\;{\mu}g/mL$ 첨가에서도 이미 99.8%의 아주 높은 암세포 증식억제 효과를 나타내었다. 또 신경아종세포인 SK-N-MC에서는 ethylacetate층인 ATMEA의 경우에서도 최종 첨가 시료농도를 $200\;{\mu}g/mL$ 첨가했을 때 이미 91%의 높은 암세포 증식억제 효과가 나타났다. 암예방 quinone reductase(QR) 유도활성을 측정한 결과, 시료의 butanol 분획물 ATMB를 $50\;{\mu}g/mL$ 첨가했을 때 시료무처리구인 대조군을 1.0으로 한 경우 암예방 QR유도 효과가 아주 높은 3.92배의 활성이 나타났다. 본 연구 결과, 인체암세포 4종류에 대한 암세포 증식억제(cytotoxicity) 효과는 부추의 ethylether 분배층(ATMEE)에서 제일 뚜렷하였고, 암예방 QR 유도활성 효과는 butanol 분배층(ATMB)에서 가장 유도효과가 좋았다. 나아가 단계적인 생리활성 물질의 분리 동정이 계속 이루어져야 할 것으로 사료된다.

• 대한약리학회:학술대회논문집
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• 대한약리학회 2006년도 The 6th Congress of the Federation of Asian and Oceanian Physiological Societies
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• pp.114.2-114.2
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• 2006

• 동의생리병리학회지
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• 제32권5호
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• pp.321-327
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• 2018

The purpose of this study was to investigate the effects of Cuscuta chinensis Lamark ethanol extract (CL) on wrinkle improvement. Cuscuta chinensis Lamark is known to contain dried saccharide, alkaloids, flavonoids, lignans and rein glycoside as major components of dried mature seeds of Cuscuta japonica Choisy. In this study, we evaluated the anti-wrinkle effects of CL and investigated bio-markers (e.g ; MMP-1, MMP-3, MMP-9, TIMP-1, type I procollagen) associated with skin wrinkle improvement. We tested the anti-wrinkle effect of CL using human fibroblast called CCD-986Sk cell. We observed an increase in MMPs, TIMP-1, and type 1 pro-collagen CL in CCD-986Sk cells irradiated with UVB at an intensity of $2mJ/cm^2$ for 60 seconds. As a result, CL decreased UVB-induced MMPs levels and mRNA expressions in CCD-986Sk cell. The levels and mRNA expressions of type I procollagen and TIMP-1 were increased by CL. These results suggest that CL has activities on improvement of skin wrinkle, which is induced by UVB radiation. Taken together, this study proposed the possibility of developing herbal medicine and functional herbal cosmetic materials with wrinkle-improving effects of Cuscuta chinensis Lamark.

• Journal of Microbiology and Biotechnology
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• 제15권1호
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• pp.80-85
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• 2005

Electrochemical control of the metabolic flux of W. kimchii sk10 on glucose and pyruvate was studied. The growing cell of W. kimchii sk10 produced 87.4 mM lactate, 69.3 mM ethanol, and 4.9mM lactate from 83.1mM glucose under oxidation condition of the anode compartment, but 98.9 mM lactate, 84.3mM ethanol, and 0.2 mM acetate were produced from 90.8 mM glucose under reduction condition of the cathode compartment for 24 h, respectively. The resting cell of W. kimchii sk10 produced 15.9 mM lactate and 15.2 mM acetate from 32.1 mM pyruvate under oxidation condition of the anode compartment, and 71.3 mM lactate and 3.8 mM acetate from 79.8mM pyruvate under reduction condition of the cathode compartment. The redox balance (NADH/$NAD^+$) of metabolites electrochemically produced from pyruvate was 1.05 and 18.76 under oxidation and reduction conditions, respectively. On the basis of these results, we suggest that the neutral red (NR) immobilized in bacterial membrane can function as an electron channel for the electron transfer between electrode and cytoplasm without dissipation of membrane potential, and that the bacterial fermentation of W. kimchii sk10 can be shifted to oxidized or reduced pathways by the electrochemical oxidation or reduction, respectively.

• 한국생물물리학회:학술대회논문집
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• 한국생물물리학회 2003년도 정기총회 및 학술발표회
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• pp.38-38
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• 2003

The electrical properties of neurons are produced by the coordinated activity of ion channels (Hille, 1992). $K^{+}$ channels play a key role in shaping action potentials and in determining neural firing patterns. Small conductance $Ca^{2+}$-activated $K^{+}$ (S $K_{Ca}$ ) channels are involved in modulating the slow component of afterhyperpolarization (AHP) (Kohler et al., 1996). Here we examine whether rat type 2 S $K_{Ca}$ (rSK2) channels can affect the shape of the action potential and the neural firing pattern, by overexpressing rat SK2 channels in Aplysia neuron R15. Our results show that rSK2 overexpression decreased the intraburst frequency and changed the regular bursting activity of neurons to an irregular bursting or beating pattern in R15, Furthermore, the overexpression of rSK2 channels increased AHP and reduced the duration of the action potential. Thus, our results suggest that ectopic S $K_{Ca}$ channels play an important role in regulating the filing pattern and the shape of the action potential.ntial.