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Collagen 유도의 사람 혈소판에서 Cyclic Nucleotides 생성 및 Ca<SUP>2+</SUP> 동원 조절을 통한 Hydroxygenkwanin의 항혈소판 작용
박창은(Chang-Eun Park),이동하(Dong-Ha Lee) 한국식품영양과학회 2023 한국식품영양과학회지 Vol.52 No.7
심장과 혈관에 영향을 미치는 것으로 알려진 심혈관 질환은 전 세계적인 주요 사망 원인으로 심혈관계 질환 치료를 위해 다양한 항혈소판제가 사용되고 있다. 최근에는 항혈소판제가 갖는 부작용 때문에 부작용이 적은 천연 생물 활성 화합물을 항혈소판 물질로 개발하기 위한 노력이 이루어지고 있다. 팥꽃나무(Daphne genkwa)의 주요 성분인 hydroxygenkwanin은 항균, 항염증 및 항암 효과와 함께 조직 인자를 억제하여 혈전증을 예방한다고 보고된 바 있지만 항혈소판 효과와 그 작용기전에 대해서는 거의 알려진 바가 없다. 본 연구는 hydroxygenkwanin이 collagen 유도의 사람 혈소판에 미치는 효과를 확인하였고, hydroxygenkwanin이 cAMP 및 cGMP 생성 증가 및 의존성 kinase의 활성화를 통해 VASP 및 IP3R이 인산화를 일으키는 것을 알 수 있었다. 이를 통해 세포질 내로의 Ca<SUP>2+</SUP> 동원을 억제하였고 fibrinogen 결합을 감소하였으며, hydroxygenkwanin에 의해 thrombin으로 유도한 fibrin clot의 형성이 억제되었다. 그러므로 본 연구를 통해 hydroxygenkwanin이 비정상적인 혈소판 활성화 및 혈전 형성으로 인하여 초래되는 심혈관 질환의 효과적인 예방 및 치료제로 개발될 가치가 있음을 제안한다. Cardiovascular disease (CVD) is a major cause of death and is treated using various antiplatelet agents. Recently, several efforts have been made to develop antiplatelet agents from natural biologically active compounds due to the side effects of the antiplatelet agent currently used. Hydroxygenkwanin is a major component of Daphne genkwa and has been reported to prevent thrombosis by inhibiting tissue factors and to have antibacterial, anti-inflammatory, and anticancer effects. However, little is known about its antiplatelet effect or mode of action. This study confirms the effect of hydroxygenkwanin on collagen-induced human platelets and reports that hydroxygenkwanin induces the phosphorylations of VASP and IP3R by increasing the productions of cAMP and cGMP and activating dependent kinases and thus inhibiting the translocation of Ca<SUP>2+</SUP> to cytoplasm, fibrinogen binding, and fibrin clot formation. Our findings suggest that hydroxygenkwanin has potential for the treatment of CVD by inhibiting platelet activation and thrombus formation.
When Can Support Vector Machine Achieve Fast Rates of Convergence?
박창이 한국통계학회 2007 Journal of the Korean Statistical Society Vol.36 No.3
Classication as a tool to extract information from data plays an impor-tant role in science and engineering. Among various classication method-ologies, support vector machine has recently seen signicant developments.The central problem this paper addresses is the accuracy of support vectormachine. In particular, we are interested in the situations where fast ratesof convergence to the Bayes risk can be achieved by support vector machine.Through learning examples, we illustrate that support vector machine mayyield fast rates if the space spanned by an adopted kernel is suciently large.
U46619 유도의 사람 혈소판에서 cAMP 생성 및 Ca2+동원의 조절을 통한 Artemisinin의 항혈전 효과
박창은,이동하 한국응용생명화학회 2023 Journal of Applied Biological Chemistry (J. Appl. Vol.66 No.-
The regulation of platelet aggregation is crucial for maintaining normal hemostasis, but abnormal or excessive platelet aggregation can contribute to cardiovascular disorders such as stroke, atherosclerosis, and thrombosis. Therefore, identifying substances that can control or suppress platelet aggregation is a promising approach for the prevention and treatment of these conditions. Artemisinin, a compound derived from Artemisia or Scopolia plants, has shown potential in various areas such as anticancer and Alzheimer’s disease research. However, the specific role and mechanisms by which artemisinin influences platelet activation and thrombus formation are not yet fully understood. This study investigated the effects of artemisinin on platelet activation and thrombus formation. As a result, cAMP production were increased significantly by artemisinin, as well as phosphorylated VASP and IP3R which are substrates to cAMPdependent kinase by artemisinin in a significant manner. The Ca2+ normally mobilized from the dense tubular system was inhibited due to IP3R phosphorylation from artemisinin, and phosphorylated VASP by artemisinin aided in inhibiting platelet activity via αIIb/β3 platelet membrane inactivation and inhibiting fibrinogen binding. Finally, artemisinin inhibited thrombin-induced thrombus formation. Therefore, we suggest that artemisinin has importance with cardiovascular diseases stemming from the abnormal platelets activation and thrombus formation by acting as an effective prophylactic and therapeutic agent.
박창은,임미소,이다은,김설아,강재원 남서울대학교 2010 남서울대학교 논문집 Vol.16 No.2
The pathogenic and non-pathogenic microorganism have been isolated from the indoor airborne, the closest environment of human beings. Our purpose were to investigate the distribution of fungi and bacteria in indoor airborne sampled from 7 locations in Namseoul University for 2 months from September to October, 2010. The isolated bacteria were identified by Gram stain and biochemical test using VITEKTM system, also The fungus were identified by LPCB. The experiment on microorganism concentration of indoor air carried out and the average of total microorganism was measured. When airborne bacteria were isolated and identified. The isolation rates of Gram positive cocci, Gram positive bacilli, Gram negative bacilli, and Gram negative cocci were 38.3%, 22.4%, 2.7%, 0%, respectively. In Gram positive cocci, the most strains were identified as Micrococcus spp. In Gram positive bacilli, the most strains were identified as Bacillus spp. The frequently isolated fungi were Aspergillus sp, Penicillium sp, Alternaria sp, Rhizopus sp, Mucor sp. respectively. Further systematic studies are necessary with an emphasis on species identification. Key Words : Microorganism, Fungus, Indoor Airborne, Micrococcus, Aspergillus