• 제목/요약/키워드: Tissue-type plasminogen activator

검색결과 51건 처리시간 0.029초

The Effect of Locally Administered Fibrinolytic Drugs Following Aneurysmal Subarachnoid Hemorrhage : A Meta-Analysis with Eight Randomized Controlled Studies

  • Jang, Kyoung Min;Choi, Hyun Ho;Nam, Taek Kyun;Park, Yong Sook;Kwon, Jeong Taik;Byun, Jun Soo;Hwang, Doyeon
    • Journal of Korean Neurosurgical Society
    • /
    • 제64권2호
    • /
    • pp.207-216
    • /
    • 2021
  • Objective : Rapid dissolution of blood clots reduces vasospasm and hydrocephalus after subarachnoid hemorrhage (SAH), and locally administered fibrinolytic drugs (LAFDs) could facilitate the dissolution. However, the efficacy of LAFDs remains controversial. The aim of this meta-analysis was to determine the efficacy of LAFDs for vasospasm and hydrocephalus and in clinical outcomes. Methods : From PubMed, EMBASE, and Cochrane database, data were extracted by two authors. Meta-analysis was performed using a random effect model. Inclusion criteria were patients who had LAFDs with urokinase-type or recombinant tissue-plasminogen activator after SAH in comparison with medically untreated patients with fibrinolytic drugs. We only included randomized controlled trials (RCTs) in this analysis. The outcomes of interest were vasospasm, hydrocephalus, mortality, and 90-day unfavorable functional outcome. Results : Data from eight RCTs with 550 patients were included. Pooled-analysis revealed that the LAFDs were significantly associated with lower rates of vasospasm (LAFDs group vs. control group, 26.5% vs. 39.2%; odds ratio [OR], 0.48; 95% confidence interval [CI], 0.32-0.73); hydrocephalus (LAFDs group vs. control group, 26.0% vs. 31.6%; OR, 0.54; 95% CI, 0.32-0.91); and mortality (LAFDs group vs. control group, 10.5% vs. 15.7%; OR, 0.58; 95% CI, 0.34-0.99). The proportion of 90-day unfavorable outcomes was lower in the LAFDs group (LAFDs group vs. control group, 32.7% vs. 43.5%; OR, 0.55; 95% CI, 0.37-0.80). Conclusion : This meta-analysis with eight RCTs indicated that LAFDs were significantly associated with lower rates of vasospasm and hydrocephalus after SAH. Thus, LAFDs could consequently reduce mortality and improve clinical outcome after SAH.

등골나물 추출물이 인간의 유방암세포인 MDA-MB-231 세포의 이동, 침윤 및 부착에 미치는 영향 (Effect of Eupatorium japonicum Extract on the Metastasis, Invasion and Adhesion of MDA-MB-231 Human Breast Cancer Cells)

  • 우은영;박소영;권수진;권규택;김종대;임순성;윤정한
    • 한국식품과학회지
    • /
    • 제43권2호
    • /
    • pp.213-219
    • /
    • 2011
  • 등골나물은 국화과 여러해살이 식물로 한방에서는 고혈압, 폐렴, 황달, 홍역, 요통 등에 사용한다고 알려져 있다. 본 연구에서는 등골나물의 꽃 부위를 추출하여 등골나물 추출물이 유방암 세포인 MDA-MB-231 세포의 이동, 침윤 및 부착에 미치는 영향을 조사하였다. 그 결과 MDA-MB-231 세포의 이동, 침윤 및 부착은 등골나물 추출물의 농도($0-20{\mu}g/mL$)가 증가할수록 현저하게 감소하였다. 등골나물 추출물은 MMP-9, MMP-2의 활성을 억제하였고, TIMP-1의 발현은 감소시킨 반면 TIMP-2의 발현은 증가시켰다. 또한, 등골나물 추출물은 uPA, VEGF 그리고 ICAM의 mRNA 및 단백질 수준을 현저히 감소시켰다. 특히, 등골나물 헥산 분획물이 유방암세포의 이동을 현저하게 억제하였다. 이상의 결과로부터 등골나물 추출물은 MMP-9, MMP-2, uPA, TIMP-1 및 ICAM의 감소, TIPM-2의 증가를 통해 유방암세포의 전이를 억제하는 것으로 판단된다. 따라서 본 연구는 이러한 효능을 지닌 등골나물 추출물을 암전이에 효과가 있는 암예방제나 항암제로 개발할 수 있는 가능성을 제시한다.

Paradigm Shift in Intra-Arterial Mechanical Thrombectomy for Acute Ischemic Stroke : A Review of Randomized Controlled Trials after 2015

  • Sheen, Jae Jon;Kim, Young Woo
    • Journal of Korean Neurosurgical Society
    • /
    • 제63권4호
    • /
    • pp.427-432
    • /
    • 2020
  • Three randomized control trials (RCTs), published in 2013, investigated efficacy of mechanical thrombectomy in large vessel occlusions and did not show better results compared to intravenous (IV) recombinant tissue-type plasminogen activator (tPA) alone. However, most clinicians treating stroke consider mechanical thrombectomy as the standard treatment rather than using IV tPA alone. This paradigm shift was based on five RCTs investigating efficacy of mechanical thrombectomy in acute ischemic stroke conducted from 2010 to 2015. They demonstrated that mechanical thrombectomy was effective and safe in acute ischemic stroke with anterior circulation occlusion when performed within 6 hours of stroke onset. There are four reasons underlying the different results observed between the trials conducted in 2013 and 2015. First, the three RCTs of 2013 used low-efficiency thrombectomy devices. Second, the three RCTs used insufficient image selection criteria. Third, following the initial presentation at the hospital, reperfusion treatment required a long time. Fourth, the three RCTs showed a low rate of successful recanalization. Time is the most important factor in the treatment of acute ischemic stroke. However, current trends utilize advanced imaging techniques, such as diffusion-weighted imaging and multi-channel computer tomographic perfusion, to facilitate the detection of core infarction, penumbra, and collateral flows. These efforts demonstrate that patient selection may overcome the barriers of time in specific cases.

The application of chitosan to dental medicine

  • Hayashi, Y.;Yamada, S.;Ohara, N.;Kim, S-K.;Ikeda, T.;Yanagiguchi, K.;Matsunaga, T.
    • 대한치과보존학회:학술대회논문집
    • /
    • 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
    • /
    • pp.545-545
    • /
    • 2003
  • Chitosan is applied as a dressing for oral mucous wound and a tampon following radical treatment of maxillary sinus. Furthermore, it is being investigated as an absorbing membrane for endodontic and periodontic surgeries. A few studies have reported osteoconduction and osteogenesia at the site of chitosan implant in vivo. However, compared with soft tissue healing processes, the mechanisms concerning effects of chitosan for biological mineralization have not yet been resoil In the present study, we studied the gene expression pattern using cDNA microarray and RT-PCR analyses in hard tissue forming osteoblasts cultured with water-soluble and low molecular weight chitooligosaccharide. cDNA microarray analysis revealed that 16 genes were expressed at 〉1.5-fold higher signal ratio levels in the experimental group compared with the control group after 3 days. RT-PCR analysis showed that chitosan oligomer induced an increase in the expression of two genes, CD56 antigen and tissue-type plasminogen activator. Furthermore, the expression of mRNAs for BMP-2 was almost identical in the experimental and control groups after 3 days of culture, but slightly increased after 7 days of culture with chitosan oligomer. These results suggest that a super-low concentration of chitooligosaccharide could modulate the activity of osteoblastic cells through mRNA levels and that the genes concerning cell proliferation and differentiation can be controlled by water-soluble chitosan.

  • PDF

동물세포 배양액으로부터 암모늄 이온의 동시제거를 위한 고정화 흡착제의 개발과 동물세포 배양 시스템에의 응용: I. 고정화 흡착시스템 개발 (Development of an Immobilized Adsorbent for in situ Removal of Ammonium Ion from Mammalian Cell Culture Media and its Application to a Mammalian Cell Bioreactor: I. Development of Immobilized Adsorbent System)

  • 박병곤;민용원;전계택;김익환;정연호
    • KSBB Journal
    • /
    • 제13권4호
    • /
    • pp.404-410
    • /
    • 1998
  • CHO 세포외 성장 및 생산성을 저해하는 엄포늄 이온의 동시 제거를 위해 PhJlhpsite~Gismondine 합성 zeolite가 alginate, cellulose acetate. dialysis membrane에 고정화된 흡착제가 개발되었다. 고정화 흡착체에 의한 암모늄 이온의 제거 효율 및 비에 따른 세표성장의 증진효과를 비교한 결과 최적의 고정화 흡착제로 membrane type이 선정되었다. 암모늄 이온의 제거 효파를 더욱더 명확하게 하고 고멸도의 세포 배양을 모사하가 위하여 8mM의 ammonium chloride를 첨가하고 membrane type 고정화 흡착제를 투여하여 암모늄 이온의 동시제거 효과를 조사한 결과 최대 세포 농도가 3배 이상 증가하였으며 생존율 역시 증가하였고 40%정도의 tPA 생산성 향상올 보여 주었다­. 이러한 증진 효과는 암모늄 이온의 고농도 시스템일수록 커졌다. 고정화 흡착제의 최적 투며 시기를 조사해본 결과 ammonium chlonde를 첨가하지 않았을 때 membrane type 고 정화 흡착제의 최적 투여 시기는 배양 시작 후 48시간이었고, 8mM의 ammonium chloride를 침가한 경우의 최적 투여 시기는 배양 시작 후 72시간이었다.

  • PDF

조직형 플라스미노겐 액티베이터와 관련 변이 단백질들을 발현하는 알팔파 형질전환체 (Expression of tissue-type plasminogen activator and its derivative proteins in transgenic alfalfa plants)

  • 심준수;이용;고효림;박효경;김형미;임규희;안기성;김용환;한범수
    • Journal of Plant Biotechnology
    • /
    • 제36권1호
    • /
    • pp.30-37
    • /
    • 2009
  • 의료용 단백질로 중요한 인체 혈관 내피세포 유래 t-PA를 알팔파 식물체를 이용하여 생산하는 기술을 개발하였다. 식물체에서 발현된 t-PA는 동물세포에서 생산된 t-PA와 동등한 시험관 내의 인공 혈전 용해 활성 및 생화학적 특성에서 유사함을 가지고 있었다. 본 연구에서는 식물체에서 발현되는 t-PA 단백질의 알팔파 코돈 이용에 최적화된 합성 유전자이용 양적 증대, 소포체에 표적에 따른 발현양 증대, 6개의 histidine의 부착에 따른 정제의 효율성을 고려하였고 두 종류의 프로모터 (CaMV 35S와 알팔파 Rbcsk-1A)를 이용하여 t-PA 및 파생 단백질들의 발현 효율을 비교 확인하고자 6가지의 식물발현 벡터를 제작하였다. 0.3%의 제초제 살포 후에 저항성을 갖는 알팔파 식물체들의 t-PA 유전자 및 파생 유전자의 genomic DNA내의 삽입 유무는 PCR법을 활용하여 t-PA, 파생 유전자 및 합성 유전자의 크기에 해당하는 1.6 kb의 PCR 산물을 확인 할 수 있었다. 6가지 발현벡터로 형질전환된 알팔파 잎 추출물에서 전체 수용성 단백질내의 t-PA 및 파생 단백질의 평균 발현양은 $9.7-39.5{\mu}g/TSP$ (mg)로 측정되었다. 이중 p221a-t-PAER 발현벡터로 형질전환된 알팔파의 잎 추출물에서 가장 높은 $75.1{\mu}g/TSP$(mg)의 발현양을 나타났다. 알팔파 잎에 발현된 재조합 t-PA 분자량은 상업적으로 판매되는 t-PA와 동일한 68 kDa으로 확인되었다. 형질전환된 알팔파 잎 추출물들의 평균 피브린 용해활성은 3.2-8.1cm를 나타내었다. 또한 t-PA 및 그의 파생 단백질을 발현하는 알팔파 식물체는 야생종 알팔파와 비교했을 때 성장에 있어서 별 다른 차이를 보이지 않았다.

실험적 폐색전증에서 조직형플라스미노겐활성체의 투여방법에 따른 혈전용해효과의 차이 (Differences in Thrombolytic Effects in Accordance with Dosing-regimens of Tissue-type Plasminogen Activator in Experimental Pulmonary Embolism)

  • 정희순;김호중;한용철
    • Tuberculosis and Respiratory Diseases
    • /
    • 제40권2호
    • /
    • pp.123-134
    • /
    • 1993
  • 연구배경 : 조직형플라스미노겐활성체는 생리적인 플라스미노겐활성체이므로 혈전의 섬유소에 결합된 플라스미노겐만을 활성화시키는 특이성이 있어 효과적이고 안전한 혈전용해제로 사용될 수 있다고 기대된다. 그러나 조직형플라스미노겐활성체의 투여방법에 대해서는 장시간동안 계속 주입해야한다는 주장과 투여시간을 1시간이내로 해도 혈전용해효과는 지속적으로 나타나고 부작용을 유발하는 정도도 미미하므로 투여시간을 짧게 하자는 주장이 양립하고 있는 실정이다. 본 연구에서는 폐혈전색전증에서 조직형플라스미노겐활성체의 투여방법에 따라 혈전용해효과가 어떻게 달라지고 폐색전증으로 인한 심폐기능장애가 약제의 투여방법에 따라 어떠한 영향을 받는지를 알아보고자 하였다. 방법 : 실험견에 방사성동위원소로 표지된 자가혈병으로 대량의 폐색전종을 유발시켜서 대조군은 특이치료를 하지 않고 제 1 치료군은 15분동안, 제 2 치료군은 3시간에 걸쳐서 재조합형의 조직형플라스미노겐활성체를 체중당 1mg씩 정맥주입하였다. 그리고 실험과정중 4시간동안 혈전색전에서 방출되는 감마선량과 각종 혈역학적 지표를 감시하고 주기적으로 동맥혈 및 혼합정맥혈의 가스분석을 시행하여 어떠한 약제투여방법이 더 효율적인가를 분석하였다. 결과: 1) 혈전용해효과는 제 1 치료군이 $36.2{\pm}3.3%$, 제 2 치료군이 $39.6{\pm}2.3%$로 유의한 차이가 없었으며, 혈전용해속도는 제 1 치료군이 $81.4{\pm}16.8%/hr$, 제 2 치료군이 $37.3{\pm}2.4%/hr$로 제 1 치료군에서 급속한 혈전용해효과를 보였다 (p<0.05). 2) 약제의 작용시간은 제 1 치료군이 $63.3{\pm}22.2$분, 제 2 치료군이 $148.5{\pm}14.0$분으로 (p<0.05), 제 1 치료군에서는 약제투여후에도 지속적인 혈전용해효과를 보이지만 제 2 치료군에서는 약제투여중에 혈전용해효과가 정지되었다. 3) 폐색전증으로 인한 혈역학적 장애와 가스교환의 장애는 제 1 치료군 및 제 2 치료군에서 비슷한 정도로 개선되었으나, 제 1 치료군에서 보다 신속하게 개선되었다(p<0.05). 결론 : 폐색전증에서 치료목적으로 동량의 조직형플라스미노겐활성체를 투여할때 약제의 투여시간이 15분인 경우와 180분인 경우를 비교해보면, 혈전색전의 용해정도는 비슷하지만 혈전의 용해속도 및 폐색전증으로 인한 심폐기능장애의 개선효과는 약제의 투여시간이 15분일 때 더 우수하였다. 따라서 약제의 투여시간을 짧게하여 혈전의 용해속도를 촉진함으로써 폐색전증으로 인한 심폐기능장애를 신속히 개선할 수 있겠다.

  • PDF

Conservation of cis-Regulatory Element Controlling Timely Translation in the 3'-UTR of Selected Mammalian Maternal Transcripts

  • Lee, Hyun-Joo;Lim, Yoon-Ki;Chang, Sang-Ho;Min, Kwan-Sik;Han, Ching-Tack;Hwang, Sue-Yun
    • Genomics & Informatics
    • /
    • 제5권4호
    • /
    • pp.174-178
    • /
    • 2007
  • The earliest stages of mammalian embryogenesis are governed by the activity of maternally inherited transcripts and proteins. Cytoplasmic polyadenylation of selected maternal mRNA has been reported to be a major control mechanism of delayed translation during preimplantation embryogenesis in mice. The presence of cis-elements required for cytoplasmic polyadenylation (e.g., CPE) can serve as a useful tag in the screening of maternal genes partaking in key functions in the transcriptionally dormant egg and early embryo. However, due to its relative simplicity, UA-rich sequences satisfying the canonical rule of known CPE consensus sequences are often found in the 3'-UTR of maternal transcripts that do not actually undergo cytoplasmic polyadenylation. In this study, we developed a method to confirm the validity of candidate CPE sequences in a given gene by a multiplex comparison of 3'-UTR sequences between mammalian homologs. We found that genes undergoing cytoplasmic polyadenylation tend to create a conserved block around the CPE, while CPE-like sequences in the 3'-UTR of genes lacking cytoplasmic polyadenylation do not exhibit such conservation between species. Through this cross-species comparison, we also identified an alternative CPE in the 3'-UTR of tissue-type plasminogen activator (tPA), which is more likely to serve as a functional element. We suggest that verification of CPEs based on sequence conservation can provide a convenient tool for mass screening of factors governing the earliest processes of mammalian embryogenesis.

Analysis of Transgene Intergration Efficiency into Porcine Fetal Fibroblast using Different Transfection Methods

  • Kim, Baek-Chul;Kim, Hong-Rye;Kim, Myung-Yoon;Park, Chang-Sik;Jin, Dong-Il
    • Reproductive and Developmental Biology
    • /
    • 제33권2호
    • /
    • pp.113-117
    • /
    • 2009
  • Animals produced by somatic cell nuclear transfer (SCNT) using genetically modified cells are almost always transgenic, implying that this method is more efficient than the traditional pronuclear microinjection method. Most somatic cells for SCNT in animals are fetus-derived primary cells and successful gene integration in somatic cells will depend on transfection condition. The objective of this study is to evaluate the efficiency of electroporation (Microporator) and liposome reagents (F-6, F-HD, W-EX, W-Q, W-M) for tissue-type plasminogen activator (tPA) gene transfection and to estimate the overall efficiency of transfection of Korean native pig fetal fibroblast cells (KNPFF). Electroporation showed significantly higher transfection efficiency than liposome reagents with regard to the transfection of in vitro cultures in the early stages of development (41.7% with Microporator vs. 18.3% with F-6, 20.0% with F-HD 18.5% with W-EX, 5.0% with W-M and 6.3% W-Q,). Colonies identified as tPA-positives were treated once more with G418 for 10 to 14 days and growing colonies were selected again. When the cells of newly selected colonies were subjected to single-cell PCR, reselection of colonies following second round of G418 selection increased the rate of transgene integration per each colony. These results suggest that transfection with electroporation is the most efficient and the second rounds of G418 selection may be an effective method for transfection of porcine fetal fibroblast cells.

Gene Transfer into Pig and Goat Fetal Fibroblasts by Co-transfection of tPA Transgene and $Neo^r$ Gene

  • Kim, Bae-Chul;Han, Rong-Xun;Kim, Myung-Yoon;Shin, Young-Min;Park, Chang-Sik;Jin, Dong-Il
    • Reproductive and Developmental Biology
    • /
    • 제33권2호
    • /
    • pp.107-111
    • /
    • 2009
  • The transfection efficiency of a transgene into pig and goat fetal fibroblast cells (PFF and GFF, respectively) was tested using co-transfection of a human tissue-type plasminogen activator (tPA) transgene and neomycin-resistant ($Neo^r$) gene, followed by G418 selection. To initially test G418 resistance, GFF and PFF were incubated in culture medium containing different concentration of G418 for 2 weeks, and cell survival was monitored over time. Based on the obtained results, the concentrations chosen for G418 selection were 800 ug/ml and 200 ug/ml for GFF and PFF, respectively. For co-transfection experiments, the pBC1/tPA and $Neo^r$ vectors were co-transfected into GFF and PFF ($1{\times}10^6$ cells in each case) using the FuGENE6 transfection reagent, and resistant colonies were obtained following 14 days of G418 selection. We obtained 96 and 93 drug-resistant colonies of GFF and PFF, respectively, only 54 and 39 of which, respectively, continued proliferating after drug selection. PCR-based screening revealed that 23 out of 54 analyzed GFF colonies and 5 out of 39 analyzed PFF colonies contained insertion of the tPA gene. Thus, the experimentally determined transfection efficiencies for tPA gene co-transfection with the $Neo^r$ gene were 42.6% for GFF and 12.8% for PFF. These findings suggest that co-transfection of a transgene with the $Neo^r$ gene can aid in the successful integration of the transgene into fetal fibroblast cells.