• BMB Reports
• /
• 제49권7호
• /
• pp.370-375
• /
• 2016

Ras oncoproteins are small molecular weight GTPases known for their involvement in oncogenesis, which operate in a complex signaling network with multiple effectors. Approximately 25% of human tumors possess mutations in a member of this family. The Raf1/MEK/Erk1/2 pathway is one of the most intensively studied signaling mechanisms. Different levels of regulation account for the inactivation of MAP kinases by MAPK phosphatases in a cell type- and stimuli-dependent manner. In the present study, using three inducible Ras-expressing NIH/3T3 cell lines, we demonstrated that MKP3 upregulation requires the activation of the Erk1/2 pathway, which correlates with the shutdown of this pathway. We also demonstrated, by applying pharmacological inhibitors and effector mutants of Ras, that induction of MKP3 at the protein level is positively regulated by the oncogenic Ras/Raf/MEK/Erk1/2 signaling pathway.

• 대한한방내과학회지
• /
• 제18권1호
• /
• pp.231-241
• /
• 1997

국내 사망률중 가장 높은 비율을 차지하고 있는 악성종양(惡性腫瘍)에 대하여 국내외적으로 다양하게 연구되고 있다. 그러나 아직까지도 종양(腫瘍)을 치료하기 우하여 수술요법(手術療法) 방사선요법(放射線療法) 면역요법(免疫療法) 화학요법(化學療法) 등의 많은 치료법들을 개발하고 있지만 종양(腫瘍)에 대한 치료원칙이나 치료약물에 대하여서는 아직까지 미흡한 것이 국내의 현실이다. 현재 일반적으로 항암제(抗癌劑)를 이용한 화학요법(化學療法) 등이 사용되고 있지만 이에 따른 부작용(副作用)이 많아 항암제(抗癌劑)와 한약재(韓藥材)를 병용투여(倂用投與)함으로써 부작용(副作用)을 최소화하고, 이에 따라 한약재(韓藥材)가 정상세포(正常細胞)에 영향을 미치며, 암종세포(癌腫細胞)에는 영향을 미칠 것으로 사료되어 관찰한 결과 유의성(有意性)이 있어 보고하게 되었다. 그리하여 수종(數種)의 한약재중(韓藥材中) 청열작용(淸熱作用)과 활혈화어(活血化瘀)작용이 있는 대극(大戟)과 목단피(牧丹皮)를 인체의 피부암세포(皮膚癌細胞)인 A431 세포(細胞), 자궁암세포(子宮癌細胞)인 HeLa 세포(細胞), 급성백혈병세포(急性白血病細胞)인 MOLT-4 세포(細胞), 만성골수성백혈병세포(慢性骨髓性白血病細胞)인 K562 세포(細胞)에 대한 세포독성(細胞毒性)과 항암제(抗癌劑)인 mitomycin C와 병용(倂用)처리결과를 MTT assay를 통하여 관찰하였다. 또한 정상세포(正常細胞)에 대한 세포독성(細胞毒性)을 검색하기 위하여 마우스 섬유아세포(Balb/c 3T3), 마우스 흉선(胸腺) 및 비장세포(脾臟細胞), human lymphocyte에 미치는 세포독성(細胞毒性)을 검토하였다. 대극(大戟)과 목단피(牧丹皮)는 A431 세포(細胞)와 K562 세포(細胞), 마우스 섬유아세포(細胞)인 Balb/c 3T3 세포(細胞) 및 mitomycin C와 병용처리(倂用處理)하였을 때 mitomycin C를 단독처리하였을 때보다 A431 세포(細胞)의 증식을 억제하였고, 백선피(白蘚皮)와 천산갑(穿山甲)은 human lymphocyte의 증식을 촉진하였다.

• 한국동물번식학회:학술대회논문집
• /
• 한국동물번식학회 2003년도 학술발표대회 발표논문초록집
• /
• pp.43-43
• /
• 2003

This study was conducted to produce transgenic pig harboring human tissue plasminogene activator (tPA) gene. Two different tPA genes containing bovine $\beta$-casein promoter and mouse uroplakin promoter were prepared for microinjection and confirmed the expression level of tPA protein from the CHO (Chinese hamster ovary) cell lines by gene transfection. Concentration of tPA expression from the six cell lines (all of CHO cells) were average 212.4 ng/ml. Reconstructed DNA to used the CHO cell were microinjected into the pronuclei of in vivo embryos The total of 2,307 zygotes were collected from 95 donors and 1,851 embryos were in 1-cell stage which were visualized the pronuclei for DNA microinjection. The concentration of linear DNA was 2.0 ng per microliter and injected into zygotes with two pronuclei on an inverted Nikon microscope equipped with narishige micromanipulator and modulation contrast optics. The 541 embryos injected with bovine $\beta$-casein promoter-tPA were transferred to 22 recipients. The 1,154 embryos injected with mouse uroplakin promoter-tPA were transferred to 51 recipients. Sixty nine offspring from 9 delivered sows were produced. We analysed the transgenes with PCR methods from 69 offsprings, but could not detect the PCR product from piglet tails DNA.

• 약학회지
• /
• 제38권2호
• /
• pp.174-178
• /
• 1994

Isoguanosine and berberine 1:1 mixture[l:[1(mole:mole)] has been prepared and evaluated by measuring antitumor effects against various tumor cell lines in culture and in mice. We reported that the synergistic effect of isoguanosine and berberine mixture has been revealed compared with each of isoguanosine and berberine increased by $3{\sim}8$ times than that of each components in various tumor cell lines in vitro. The most effective dose of isoguanosine and berberine mixture was 60 mg/kg/day in mice bearing S-180 solid tumor, the %(1-T/C) values were 70%. Against the P-388 leukemia, isoguanosine-berberine mixture was the most effective at the dose of 60 mg/kg/day, the %T/C values were 163%.

• 대한한의학회지
• /
• 제17권2호
• /
• pp.303-310
• /
• 1996

The purpose of this study was to investigate effect of water extract of Carthami Flos on the proliferation of human cancer cell-lines. The effects of Carthami Flos on the proliferation of A431, HeLa, MOLT-4, K562 cells, Balb／c 3T3 cells, mouse thymocytes, splenocytes and human lymphocytes were estimated by MTT colorimetric assay. The results were as follows; 1. Carthami Flos did not effect A431, HeLa, MOLT-4, K562 cells. 2. The cytotoxicity of mitomycin C on K562 cells was increased by the combination of Carthami Flos. 3. Carthami Flos inhibited the proliferation of Balb／c 3T3 cells. 4. Carthami Flos stimulated the proliferation of thymocytes. 5. Carthami Flos stimulated the proliferation of splenocytes. 6. Carthami Flos stimulated the proliferation of human lymphocytes.

• Asian Pacific Journal of Cancer Prevention
• /
• 제15권14호
• /
• pp.5659-5665
• /
• 2014

Background: To investigate the antioxidant value and anticancer functions of mitragynine (MTG) and its silane-reduced analogues (SRM) in vitro. Materials and Methods: MTG and SRM was analyzed for their reducing power ability, ABTS radical inhibition and 1,1-diphenyl-2-picryl hydrazylfree radicals scavenging activities. Furthermore, the antiproliferation efficacy was evaluated using MTT assay on K 562 and HCT116 cancer cell lines versus NIH/3T3 and CCD18-Co normal cell lines respectively. Results: SRM and MTG demonstrate moderate antioxidant value with ABTS assay (Trolox equivalent antioxidant capacity (TEAC): $2.25{\pm}0.02$ mmol trolox / mmol and $1.96{\pm}0.04$ mmol trolox / mmol respectively) and DPPH ($IC_{50}=3.75{\pm}0.04mg/mL$ and $IC_{50}=2.28{\pm}0.02mg/mL$ respectively). Both MTG and SRM demonstrate equal potency ($IC_{50}=25.20{\pm}1.53$ and $IC_{50}=22.19{\pm}1.06$ respectively) towards K 562 cell lines, comparable to control, betulinic acid (BA) ($IC_{50}24.40{\pm}1.26$). Both compounds showed concentration-dependent cytototoxicity effects and exert profound antiproliferative efficacy at concentration > $100{\mu}M$ towards HCT 116 and K 562 cancer cell lines, comparable to those of BA and 5-FU (5-Fluorouracil). Furthermore, both MTG and SRM exhibit high selectivity towards HCT 116 cell lines with selective indexes of 3.14 and 2.93 respectively compared to 5-FU (SI=0.60). Conclusions: These findings revealed that the medicinal and nutitional values of mitragynine obtained from ketum leaves that growth in tropical forest of Southeast Asia and its analogues does not limited to analgesic properties but could be promising antioxidant and anticancer or chemopreventive compounds.

• Reproductive and Developmental Biology
• /
• 제28권1호
• /
• pp.7-12
• /
• 2004

This study was performed to establish the effective culture condition for the establishment of clonal lines from porcine fetal fibroblast cells. Fibroblasts derived from a pig fetus (Day 50) were cultured and passaged two times before use. A single cell was seeded in 96-well plates, cultured in medium supplemented with different concentrations of FBS, catalase or $\beta$-mercaptoethanol ($\beta$ME), and classified by cell size and morphology. Cells were passaged two times into 4-well dish before freezing. The establishment efficiencies were not different among different concentrations of FBS (0.3 to 5.1%). However, population doubling time (PDT) was significantly decreased by increasing the FBS concentration (P＜0.05). The establishment efficiency of $\beta$ME-added group (10.4%) was significantly higher than those of catalase-added and control groups (3.5%, and 3.5%, respectively, p＜0.05), and PDT was significantly decreased (23.6 vs 28.1, and 25.5 h, respectively, p＜0.05). However, catalase did not show a positive effect on the establishment efficiency. Cell size and morphology did not affect the establishment efficiency and PDT of clonal lines. The result of present study shows that the establishment efficiency of clonal cell lines can be enhanced by the culture in media supplemented with 30% FBS and $\beta$ME.

• KSBB Journal
• /
• 제26권3호
• /
• pp.248-254
• /
• 2011

Various biometerials have been researched and have been developed for treatment of some disease through transplantation to body. They have been evaluated by in vitro cytotoxicity test using some skin-derived cell lines for prediction of their biocompatibility in vivo. However, the results of experiments using mesenchymal or epithelial cells could not be considered in vivo immune reaction. In this study, we evaluated the biomaterial-elution (elute from high density polyethylene film) using some cell lines (L929, Jurkat, U937) in vitro, and then that results were compared with in vivo results from guinea pig sensitization test. In sensitization test, saline and elution of syringe could not induce erythema, but only DNCB (hypersensitive chemical) induce erythema at guinea pig sensitization test. In cell experiment, the cytotoxicity results of inflammatory cells (Jurkat; T lymphocyte, U937; monocyte) was no difference with L929 (fibroblast) in the overall trend. However, inflammatory cell lines were only secreted inflammatory cytokine (TNF-${\alpha}$, INF-${\gamma}$) in some materials (biomateriallution, FAC, DNCB). And the biomaterial-elution did not have toxicity to the cells, but it induced the inflammatory cytokines in inflammatory cell lines only. So, we were predicted inflammatory reaction through the cytokine resultes of inflammatory cell lines, and it was more correlated with in vivo results than cytotoxicity test. Therefore, we suggested that the inflammatory cytokine assay using inflammatory cell lines are more effective method in vitro for evaluation of biocompatibility of biomaterials or chemicals.

• 한국발생생물학회지:발생과생식
• /
• 제21권4호
• /
• pp.425-434
• /
• 2017

Polyploidy is occurred by the process of endomitosis or cell fusion and usually represent terminally differentiated stage. Their effects on the developmental process were mainly investigated in the amphibian and fishes, and only observed in some rodents as mammalian model. Recently, we have established tetraploidy somatic cell nuclear transfer-derived human embryonic stem cells (SCNT-hESCs) and examined whether it could be available as a research model for the polyploidy cells existed in the human tissues. Two tetraploid hESC lines were artificially acquired by reintroduction of remained 1st polar body during the establishment of SCNT-hESC using MII oocytes obtained from female donors and dermal fibroblasts (DFB) from a 35-year-old adult male. These tetraploid SCNT-hESC lines (CHA-NT1 and CHA-NT3) were identified by the cytogenetic genotyping (91, XXXY,-6, t[2:6] / 92,XXXY,-12,+20) and have shown of indefinite proliferation, but slow speed when compared to euploid SCNT-hESCs. Using the eight Short Tendem Repeat (STR) markers, it was confirmed that both CHA-NT1 and CHA-NT3 lines contain both nuclear and oocyte donor genotypes. These hESCs expressed pluripotency markers and their embryoid bodies (EB) also expressed markers of the three embryonic germ layers and formed teratoma after transplantation into immune deficient mice. This study showed that tetraploidy does not affect the activities of proliferation and differentiation in SCNT-hESC. Therefore, tetraploid hESC lines established after SCNT procedure could be differentiated into various types of cells and could be an useful model for the study of the polyploidy cells in the tissues.

• 대한두경부종양학회:학술대회논문집
• /
• 대한두경부종양학회 1991년도 제8차 학술대회 연제순서 및 초록집
• /
• pp.22.2-24
• /
• 1991