• Nuclear Engineering and Technology
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• 제42권5호
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• pp.562-567
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• 2010

A One-Dimensional Water Flow and Contaminant Transport in Unsaturated Zone (FTUNS) code has been developed in order to interpret radionuclide migration in an unsaturated zone. The pore-size distribution index (n) and the inverse of the air-entry value ($\alpha$) for an unsaturated zone were measured by KS M ISO 11275 method. The hydraulic parameters of the unsaturated soil are investigated by using soil from around a nuclear facility in Korea. The effect of hydraulic parameters on radionuclide migration in an unsaturated zone has been analyzed. The higher the value of the n-factor, the more the cobalt concentration was condensed. The larger the value of $\alpha$-factor, the faster the migration of cobalt was and the more aggregative the cobalt concentration was. Also, it was found that an effect on contaminant migration due to the pore-size distribution index (n) and the inverse of the air-entry value ($\alpha$) was minute. Meanwhile, migrations of cobalt and cesium are in inverse proportion to the Freundich isotherm coefficient. That is to say, the migration velocity of cobalt was about 8.35 times that of cesium. It was conclusively demonstrated that the Freundich isotherm coefficient was the most important factor for contaminant migration.

• 생명과학회지
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• 제26권10호
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• pp.1189-1195
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• 2016

Vascular endothelial growth factor (VEGF)와 hepatocyte growth factor (HGF)는 강력한 혈관신생 유도인자로 알려져 있다. 세포가 이동하고 침윤하기 위해서는 세포의 증식과 더불어 주변의 세포외기질을 분해하는 단백질분해효소의 분비가 선행되어야 한다. 본 연구에서는 인간의 악성신경교종 유래 세포주인 U-373-MG 세포에 VEGF와 HGF를 처리하여 세포의 증식, matrix metalloproteinase-2 (MMP-2)와 MMP-9 및 플라스민의 분비, 세포의 이동 및 침윤에 미치는 효과를 조사하였다. 또한 단백질분해효소 억제제 처리를 통하여 세포의 증식, 이동 및 침윤에 미치는 단백질분해효소의 역할을 조사하였다. 연구 결과, VEGF와 HGF의 병용처리 시 VEGF와 HGF의 단독 처리 시보다 세포의 증식, MMP-2, MMP-9 및 플라스민의 분비, 세포의 이동 및 침윤이 유의할만하게 증가되었다. 한편 VEGF와 HGF 처리에 의한 U-373-MG 세포의 증식, 이동 및 침윤 증가에 미치는 단백질분해효소의 효과를 MMPs 억제제인 BB-94를 처리하여 조사한 결과 최대 이동 효과를 나타낸 HGF와 VEGF의 병용처리군 보다 세포의 이동이 32% 억제되었고 플라스민 억제제인 α2AP에 의해서도 29% 억제되었다. 또한 U-373-MG 세포의 침윤 역시 BB-94와 α2AP 처리에 의해 유의할 만하게 억제되었다. 이러한 결과는 VEGF와 HGF에 의한 MMP-2, MMP-9 및 플라스민의 분비증가에 의해 직접 또는 간접적인 경로를 통하여 U-373-MG 세포의 증식, 이동 및 침윤을 증가시킨다고 여겨진다.

• BMB Reports
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• 제53권12호
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• pp.646-651
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• 2020

Bone resorption is linked to bone formation via temporal and spatial coupling within the remodeling cycle. Several lines of evidence point to the critical role of coupling factors derived from pre-osteoclasts (POCs) during the regulation of bone marrow-derived mesenchymal stem cells (BMMSCs). However, the role of glial cell-derived neurotrophic factor (GDNF) in BMMSCs is not completely understood. Herein, we demonstrate the role of POC-derived GDNF in regulating the migration and osteogenic differentiation of BMMSCs. RNA sequencing revealed GDNF upregulation in POCs compared with monocytes/macrophages. Specifically, BMMSC migration was inhibited by a neutralizing antibody against GDNF in pre-osteoclast-conditioned medium (POC-CM), whereas treatment with a recombinant GDNF enhanced migration and osteogenic differentiation. In addition, POC-CM derived from GDNF knock-downed bone marrow macrophages suppressed BMMSC migration and osteogenic differentiation. SPP86, a small molecule inhibitor, inhibits BMMSC migration and osteogenic differentiation by targeting the receptor tyrosine kinase RET, which is recruited by GDNF into the GFRα1 complex. Overall, this study highlights the role of POC-derived GDNF in BMMSC migration and osteogenic differentiation, suggesting that GDNF regulates bone metabolism.

• 벤처창업연구
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• 제12권5호
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• pp.39-53
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• 2017

본 연구는 농촌흡인요인, 귀농준비정도, 귀농지 주거환경, 귀농 지원정책이 귀농만족도에 미치는 영향에 관해 가족요인을 조절효과로 반영하여 연구하였다. 이는 농촌으로 이주율이 증가하고, 귀농에 대한 관심이 증대 되는 시점에 농촌흡인요인, 귀농준비정도, 귀농지 주거환경, 귀농 지원정책이 귀농만족도에 유익한 영향을 미치는지와 독립변수로 제시된 농촌흡인요인, 귀농준비정도, 귀농지 주거환경, 귀농 지원정책과 종속변수인 귀농만족도 간에 가족요인 조절효과를 분석하여, 귀농만족도에 영향을 미치는 변수들을 규명하는데 그 목적이 있다. 본 연구를 위해서 귀농인을 대상으로 한 설문조사를 진행하였고, 최종적으로 237개의 유효한 설문지를 수집하였다. 수집된 자료는 인구통계학적 특성을 통제변인으로 하는 다중회귀분석을 진행하였고 가족요인 조절효과는 조절회귀 분석을 실시하였다. 분석결과는 다음과 같다. 농촌흡인 요인 중 경제적 요인이 높을수록 귀농 만족도가 높아지는 것으로 나타났고, 귀농준비정도에서는 작목준비가, 귀농지 주거환경에서는 안전성, 귀농지원정책에서는 창농지원이 귀농만족도에 정(+)의 영향을 미치는 것으로 나타났다. 가족요인의 조절효과 분석결과 경제적 요인, 작목준비, 편리성과 귀농만족도 간에 가족요인의 조절 효과가 나타났다. 이러한 연구를 통해, 귀농만족을 높이고 도시로의 재 이주율을 줄이기 위해 귀농정책의 적극적인 지원과 귀농지의 안정성 그리고 귀농흡인 요소에서 경제적인 이익이 증대시키는 것이 무엇보다 중요하다는 결론을 도출하였다.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.326.2-327
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• 2002

Glial cell-derived neurotrophic factor (GDNF) is a potent neurotrophic factor that enhances survival of midbrain doparminergic neuron. GDNF and its receptors are widely distributed in brain and are believed to be involved in the control of neuron survival and differentiation. In this study, we examined the effect of GDNF on proliferation and migration of Hs683 human glioma cells. GDNF markedly enhances proliferation and migration of Hs683 cells in a dose-dependent manner. (omitted)

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 2003년도 Annual Meeting of KSAP : International Symposium on Pharmaceutical and Biomedical Sciences on Obesity
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• pp.76-76
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• 2003

Mast cells accumulation can be causally related with several allergic inflammations. Previous work has demonstrated that glucocorticoids decreased tissue mast cell number and stem cell factor (SCF)-induced migration of mast cells required p38 mitogen-activated protein kinase (MAPK) activation. In the present study, we investigated the effects of dexamethasone on SCF-induced migration of rat peritoneal mast cells (RPMCs). SCF significantly induced migration of RPMCs at 4 h. Dexamethasone dose-dependently inhibited SCF-induced migration of RPMCs (about 90.1% at 100 nM, P<0.05). MAPK p38 inhibitor, SB203580 (20 ${\mu}$M) also inhibited the SCF-induced migration. The ability of SCF to enhance morphological alteration and F -actin formation was also abolished by treatment of dexamethasone. Dexamethasone inhibited SCF-induced p38 MAPK activation to near basal level and induced the MKP-1 expression. In addition, SCF-induced inflammatory cytokine production was significantly inhibited by treatment of dexamethasone or SB203580 (p<0.01). Our results show that dexamethasone potently regulates SCF -induced migration, p38 MAPK activation and inflammatory cytokine production through expression of MKP-l protein in RPMCs. Such modulation may have functional consequences during dexamethasone treatment, especially mast cell-mediated allergic inflammation disorders.

• 한국임상수의학회지
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• 제38권6호
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• pp.261-268
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• 2021

The study was conducted to evaluate the effects of carboxymethyl chitosan (CMC) on proliferation, migration, and lipopolysaccharide (LPS)-induced inflammatory response in canine bone marrow-derived mesenchymal stem cells (BMSCs). The proliferation and migration of BMSCs were examined after treatment with CMC. The effect of CMC on the mRNA expression of inflammatory cytokines, such as interleukin (IL)-1β, IL-6, tumor necrosis factor (TNF)-α, IL-10, and transforming growth factor (TGF)-β, was also evaluated by reverse transcription polymerase chain reaction (RT-PCR). In the proliferation assay, no significant changes were found at all CMC concentrations compared with controls. The migration assay showed that CMC dose-dependently stimulated the migration of BMSCs in normal and LPS-treated conditions. RT-PCR showed that TNF-α and IL-10 expressions were suppressed in the BMSCs after CMC treatment. However, other genes were not affected. Taken together, CMC promoted BMSC migration and inhibited TNF-α and IL-10. Therefore, CMC may be possible to regulate wound healing when mesenchymal stem cells are applied in inflammatory diseases.

• International Journal of Oral Biology
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• 제43권3호
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• pp.161-169
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• 2018

We previously demonstrated that epidermal growth factor (EGF) enhances cell migration and invasion of breast cancer cells in a SMAD ubiquitination regulatory factor 1 (SMURF1)-dependent manner and that SMURF1 induces degradation of ${\beta}-catenin$ in C2C12 cells. However, the relationship between EGF-induced SMURF1 and ${\beta}-catenin$ expression in breast cancer cells remains unclear. So, we investigated if EGF and SMURF1 regulate ${\beta}-catenin$ expression in MDAMB231 human breast cancer cells. When MDAMB231 cells were incubated with EGF for 24, 48, and 72 hours, EGF significantly increased expression levels of SMURF1 mRNA and protein while suppressing expression levels of ${\beta}-catenin$ mRNA and protein. Overexpression of SMURF1 downregulated ${\beta}-catenin$ mRNA and protein, whereas knockdown of SMURF1 increased ${\beta}-catenin$ expression and blocked EGF-induced ${\beta}-catenin$ downregulation. Knockdown of ${\beta}-catenin$ enhanced cell migration and invasion of MDAMB231 cells, while ${\beta}-catenin$ overexpression suppressed EGF-induced cell migration and invasion. Furthermore, knockdown of ${\beta}-catenin$ enhanced vimentin expression and decreased cytokeratin expression, whereas ${\beta}-catenin$ overexpression decreased vimentin expression and increased cytokeratin expression. These results suggest that EGF downregulates ${\beta}-catenin$ in a SMURF1-dependent manner and that ${\beta}-catenin$ downregulation contributes to EGF-induced cell migration and invasion in MDAMB breast cancer cells.

• KSBB Journal
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• 제18권6호
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• pp.485-489
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• 2003

HGF는 내피세포의 증식 및 이동을 일으키는 강력한 혈관 신생 유도인자 및 생존인자로서 작용한다고 알려져 있다. 본 연구에서는 HUVECs 세포를 이용하여 내피세포의 이동 및 단백질분해효소의 분비에 미치는 HGF의 효과를 확인하였다. 그 곁과, HGF 처리 (10ng/$m\ell$)에 의해 HUVECs 세포의 이동이 약 3.3배 촉진되어, HGF가 HUVECs 세포에서 강력한 이동 유도인자라는 사실을 확인하였다. 내피세포의 이동에 관여할 것이라 여겨지는 MMPs, TIMPs 및 플라스민의 분비에 미치는 HGF의 효과를 관찰한 결과, HGF에 의해 MMP-2 및 MMP-3의 분비양이 각각 3.3배와 6.1배씩 증가되었다. HGF에 의한 TIMPs 분비효과를 관찰한 결과, TIMP-1은 대조군에 비해 약 1.8배 분비가 증가되었으나, TIMP-2는 대조군에 비해 약 3.1배 분비가 억제되었다. 또한, 광범위 MMPs-억제제인 BB-94 (20ng/$m\ell$) 및 플라스민 억제제인 $\alpha$$_2$-antiplasmin (100mU)을 처리했을 때, HGF에 의해 유도된 혈관내피세포의 이동이 거의 완벽하게 억제되었다. 결론적으로, HGF는 HUVECs 세포에서 MMP-2, MMP-3, MMP-9, TIMP-1 및 플라스민의 분비 증가를 일으켰으며, HGF에 의해 분비가 증가 된 단백질분해효소에 의해 세포외기질 및 기저막 단백질로의 혈관내피세포의 이동이 촉진되고, 결과적으로 혈관신생을 유도할 것이라 사료된다.

• Biomolecules & Therapeutics
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• 제28권5호
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• pp.405-413
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• 2020

Fibroblast-like synoviocytes (FLS) play a crucial role in initiating rheumatoid arthritis. B-cell activating factor (BAFF) plays a role in FLS survival as well as in B cell maturation and maintenance. Here, we investigated whether tumor necrosis factor (TNF)-α-induced BAFF expression controls FLS migration and whether BAFF expression in FLS could be regulated by KR33426 which is the inhibitor of BAFF binding to BAFF receptors (BAFF-R) by using MH7A synovial cells transfected with the SV40 T antigen. More TNF-α-treated cells migrated compared to the control. TNF-α increased BAFF expression in FLS, significantly. FLS migration was inhibited by the transfection with BAFF-siRNA. KR33426 also inhibited BAFF expression increased by TNF-α treatment in FLS as judged by western blotting, PCR, and transcriptional activity assay. Kinases including JNK, p38 and Erk were activated by TNF-α treatment. While JNK and p38 were inhibited by KR33426 treatment, no changes in Erk were observed. Transcription factors including p65, c-Fos, CREB and SP1 were enhanced by TNF-α treatment. Among them, c-Fos was inhibited by KR33426 treatment. Small interference(si)-RNA of c-fos decreased BAFF transcriptional activity. FLS migration induced by TNF-α was inhibited by the transfection with BAFF-siRNA. KR33426 increased Twist, Snail, Cadherin-11 and N-Cadherin. In contrast, KR33426 decreased E-cadherin and TNF-α-enhanced CCL2. Taken together, our results demonstrate that synovial cell migration via CCL2 expression could be regulated by BAFF expression which is decreased by KR33426 and c-Fos-siRNA. It suggests for the first time that the role of BAFF-siRNA on FLS migration might be matched in the effect of KR33426 on BAFF expression.