• BMB Reports
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• 제33권3호
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• pp.276-278
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• 2000

The postsynaptic density (PSD), a large protein complex beneath the postsynaptic membrane, is notorious for its 'stickiness'. In order to understand the molecular composition of the PSD fraction, a 17 kDa protein band was isolated by electroelution from SDS-geis, and its partial amino acid sequence was determined from HPLC-purified tryptic peptides of the protein. Surprisingly, the amino acid sequence was identical to that of the previously reported 17 kDa isoform of the myelin basic protein (MBP), an essential protein in CNS myelin formation. Since the protein band represented ~2% of the total proteins in the 1 % n-octyl glucoside-insoluble PSD fraction, these results indicate that a significant amount of the 17 kDa isoform of MBP is tightly associated with the PSD during preparation of the PSD fraction.

• Journal of Microbiology
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• 제42권2호
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• pp.117-125
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• 2004

Propionibacterium acnes (P. acnes) plays an important role in the disease pathogenesis of acne vulgaris, a disorder of pilosebaceous follicles, seen primarily in the adolescent age group. In the present study, the presence of antibodies against P. acnes (MTCC1951) were detected in acne patient (n=50) and disease free controls (n=25) using dot-ELISA and Western blot assay. The ability of P. acnes to induce pro-inflammatory cytokines by human peripheral blood mononuclear cells (PBMCs), obtained from acne patients and healthy subjects, were also analysed. The patients (n=26) who were culture positive for skin swab culture, were found to have a more advanced disease and higher antibody titres (1:4000 to >1:16000) compared to the P. acnes negative patients (n=24) and normal controls (n=25). An analysis of patients' sera by western blot assay recognized a number of antigenic components of P. acnes, rang-ing from 29 to 205 kDa. The major reactive component was an approximately 96 kDa polypeptide, which was recognised in 92％ (24 of 26) of the patients sera. Further, the P. acnes culture supernatant, crude cell lysate and heat killed P. acnes whole cells, obtained from 72-h incubation culture, were observed to be able to induce significant amounts of IL-8 and tumor necrosis factor alpha (TNF-${\alpha}$) by the PBMCs in both the healthy subjects and patients, as analysed by cytokine-ELISA. The levels of cytokines were significantly higher in the patients than the healthy subjects. A major 96 kDa polypep-tide reactant was eluted from the gel and was found to cause dose dependent stimulation of the pro-ductions of IL-8 and TNF-${\alpha}$. Thus, the above results suggest that both humoral and pro-inflammatory responses play major roles in the pathogenesis of acne.

• Biomolecules & Therapeutics
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• 제6권2호
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• pp.182-190
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• 1998

DA-3585 is a recombinant human erythropoietin produced by Dong-A pharmaceutical Co. Ltd. using recombinant DNA technique. Recently, recombinant human erythropoietin (rHu-EPO) has been used to treat various types of anemia. In this study, we examined acute and subacute toxicity of DA-3585 in rats. DA-3585 was intravenously administered to rats at dose levels of 0, 6,250, 12,500 and 25,000 lU/kg for single dose toxicity study and at dose levels of 0,100,500 and 2,500IU/kg daily for 4 week-repeated dose toxicity study. In the single dose toxicity study, there were no death, clinical signs and changes in body weight gain related to the treatment. Necropsy revealed no evidence of toxicity related to DA-3585, In the repeated dose toxicity study, all the rats survived throughout the study. There were no treatment-related changes in clinical signs, food and water intake, and body weight. Hematological examination showed increases in the number of erythrocytes, hemoglobin concentration, hematocrit value and mean corpuscular volume, and decrease in the number of platelet in 500 and 2,500 lU/kg dosed groups. Extramedullary hematopoiesis in the spleen and erythroid hyperplasia in the bone marrow were noted as treatment-related histological changes. Toxicologically significant changes were not observed in blood biochemistry, urinalysis, organ weights and in any other examinations. The treatment-related changes observed in this study were hematological or histological changes associated with pharmacological effects of DA-3585. On the basis of the results of this study, LD5n value of DA-3585 was above 25,000 lU/kg and the no-observed-adverse-effect-level was estimated to be 100 lU/kg.

• Parasites, Hosts and Diseases
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• 제32권4호
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• pp.243-248
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• 1994

질편모충 항원 분석의 일환으로 막항원의 분석을 시도하였다 수확 세척된 질편모충 HY-l의 homogenate를 sucrose step-gradient를 이용하여 differential centrifugation하였으며 25%/45%의 sucrose 경계면으로녁터 막분회을 얻었다. 분리된 막분회은 transmission electron microscopy를 통하여 순수 분리되었는지 확인하였고 효소면역 전기영동 이적법(EITB)을 이용하여 항원성을 관찰하였으며 그 결과는 다음과 같았다. 분리된 막분획은 투과전자 현미경상에서 extended sheet나 concentric vesicle의 형태가 거의 균질하게 분포하고 있었으며 막 분획에서 특징적으로 나타나는 trilaminal appearance를 보여 질편모충의 막분획이 순수 분리된 것으로 간주할 수 있었다. 분리된 막분획은 EITB상에 토끼의 항혈청과 반응하였을 때 46, 60, 110, 120, 130 및 150 kfDa에서 항원성이 있는 반응대가 관찰되었으며 N-hydroxysuccinimido-biotic으로 표지하여 분리된 표면항원의 녁획과 비교하였을 때 60 KDa의 항원 분획이 서로 일치하는 것으로 나타났다. 따라서 60 kfDa 의 항원 분획은 료면 항원임을 확신할 수 있었다.

• Biomolecules & Therapeutics
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• 제19권1호
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• pp.118-125
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• 2011

Free radical scavenging and antioxidants have attracted attention as a way to prevent the progression of Parkinson's disease (PD). This study was carried out to investigate the effects of n-hexane fraction from Laurus nobilis L. (Lauraceae) leaves (HFL) on dopamine (DA)-induced intracellular reactive oxygen species (ROS) production and apoptosis in human neuroblastoma SH-SY5Y cells. Compared with apomorphine (APO, $IC_{50}=18.1\;{\mu}M$) as a positive control, the HFL $IC_{50}$ value for DA-induced apoptosis was $3.0\;{\mu}g/ml$, and two major compounds from HFL, costunolide and dehydrocostus lactone, were $7.3\;{\mu}M$ and $3.6\;{\mu}M$, respectively. HFL and these major compounds significantly inhibited ROS generation in DA-induced SH-SY5Y cells. A rodent 6-hydroxydopamine (6-OHDA) model of PD was employed to investigate the potential neuroprotective effects of HFL in vivo. 6-OHDA was injected into the substantia nigra of young adult rats and an immunohistochemical analysis was conducted to quantitate the tyrosine hydroxylase (TH)-positive neurons. HFL significantly inhibited 6-OHDA-induced TH-positive cell loss in the substantia nigra and also reduced DA induced $\alpha$-synuclein (SYN) formation in SH-SY5Y cells. These results indicate that HFL may have neuroprotective effects against DA-induced in vitro and in vivo models of PD.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2009년도 추계학술대회 초록집
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• pp.163-164
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• 2009

dc unbalanced magnetron sputtering 방법으로 superhard quarternary Ti-B-C-N films을 합성하였다. XPS, XRD 분석 결과 Ti-B-C-N films은 solid-solution (Ti,C,N)$B_2$와 Ti(C,N) 결정이 amorphous BN에 분포된 나노 복합체를 형성하였다. 여기에서는 film내 N의 양에 따라 강도가 증가하다가 그 후 감소하는 경향을 보였다.

• 대한의료기공학회지
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• 제2권2호
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• pp.33-50
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• 1998

• Archives of Pharmacal Research
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• 제18권5호
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• pp.301-307
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• 1995

In the particulate fraction obtained from PKC-down regulated K562 cells by treatment for 24 h with 200nM TPA, phosphorylation of two proteins with molecular weight, 100 kDa and 23 kDa (designated p100 and p23, respectvely) was depleted and addition of exogenous purified PKC to this fraction failed to testore their phosphorylation. However, in the soluble fraction, all of phosphoproteins abolished by long-term treatment with TPA were restored by exogenously added PKC. Phosphorylation of two proteins was increased by short-term tretment (20 min), and diminished with the persistant exposure to TPA as well as at a concentration as low as 1nM. When K562 cells were treated with 1 nM and 200 nM TPA for 24 h, phosphorylation of p100 was restored with or without exogenous PKC on 2-3day and 6day after removal of treated TPA, respectively. Two-dimensional electrophoresis of phosphoproteins revealed that phosphorylated p100 (pl=5.9) and p66 species were completely absent from the particulate fraction of K562 cells treated with 200nM TPA for 24 h. These results suggest that the interaction of sensitive endogenous substrates, p100 and p23 with the plasma membrane might be regulated by PKC-down regulation without displacement to the cytosol and the interaction of p100 with the membrane might be reveersible.

• Journal of Chest Surgery
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• 제41권4호
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• pp.423-429
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• 2008

배경: 최근 수술 로봇을 이용한 심장수술에 대한 관심이 증가하고 있으나, 이에 대한 임상연구는 제한적이다. 본 연구는 2007년 8월부터 저자들에 의해 시행된 다빈치 수술 로봇을 이용한 심장수술의 조기 임상 경험을 보고하고, 로봇 심장수술 실현성 및 안정성을 살펴보고자 하였다. 대상 및 방법: 2007년 8월부터 12월까지 총 20명의 환자에게 다빈치 수술로봇을 이용한 심장수술을 시행하였다. 승모판막 질환(n=11), 삼첨판막 질환(n=1), 심방중격결손증(n=1)의 수술시에는 우측 대퇴 동정맥 및 우측 내경정맥을 이용한 말초 삽관 후 체외 순환을 시행하였고, 전방성 심정지액 투입 및 흘곽의 늑간을 통한 대동맥 겸자를 시행한 후 개심술을 시행하였다. 7명의 환자에서 최소 침습적 관상동맥 우회술(MIDCAB)을 시행하기 위하여 다빈치 수술로봇을 이용하여 좌측 혹은 양측 내흉동맥을 박리하였다. 결과: 환자의 평균 나이는 $50.1{\pm}15.1$세($26{\sim}78$)였으며, 11예의 승모판막 성형술시 3예의 Maze 수술 및 1예의 삼첨판막 성형술이 동반되었다. 평균 체외순환시간은 $208.0{\pm}61.3$분, 평균대동맥 차단시간은 $158.8{\pm}40.6$분이었다. 승모판막 성형술 후 2도를 초과하는 잔존하는 승모판막 역류는 없었으며 수술 후 재원 기간의 중간값은 4일이었다. 다빈치 수술로봇을 이용한 내흉동맥의 박리는 6명의 환자에서 좌측 내흉동맥을 박리하였고, 1명의 환자에서 양측 내흉동맥을 박리하였으며 평균 내흉동맥 박리 시간은 $43.2{\pm}12.0$분이었다. 박리된 내흉동맥은 양호한 혈류를 보였으며, 좌전 개흉술 후 직접시하에서 문합을 시행하였다. MIDCAB으로 시행한 문합의 개통률은 100% (18/18)였다. 결론: 다빈치 수술로봇을 이용한 심장수술은 승모판막 성형술, 삼첨판막 성형술, 심방중격 결손의 교정 및 관상동맥 우회술을 위한 내흉동맥의 박리 등에서 다양하게 적용되었으며, 비교적 안전하고 만족할만한 조기성적을 보였다. 본 연구를 계기로 국내에서도 다빈치 수술로봇을 이용한 심장수술의 임상적용 및 임상연구가 활발하게 진행될 것을 기대한다.

• 한국식품저장유통학회지
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• 제24권5호
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• pp.688-696
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• 2017

본 연구는 불등풀가사리로부터 분리된 조다당류와 산가수분해된 다당류의 분자량에 따른 이화학적 품질특성과 항산화 활성 및 피부 주름 개선 효과를 확인하였다. 산가수분해 분자량별 다당류의 수율은 100 kDa 이상에서 29.6%로 가장 높았으며, 10 kDa 이하에서 10.4%로 가장 낮았다. 이화학적 특성으로 총당, uronic acid, sulfate 함량은 100 kDa 이상에서 각각 85.82%, 32.85 g/100g 및 39.04%로 조다당에 비해 증가하였다. 색도은 분자량이 증가함에 따라 L 값, a 값 및 b 값이 감소하였으며, 점도는 분자량이 높을수록 증가하였다. ORAC 활성은 100 kDa 이상에서 $180.07{\mu}M$을 나타내어 조다당 $34.70{\mu}M$에 비해 항산화활성이 우수하였다. L132 세포 사멸에 대한 보호효과는 $H_2O_2$ 처리 구간대비 분자량 100 kDa 이상($0.5-5{\mu}g/mL$)에서 87.34-103.85%로 세포 활성이 증가하여 세포 보호효과를 나타내었다. MMP-1 활성은 세포에 UVB를 조사한 후 분자량 100 kDa 이상 $0.05-0.5{\mu}g/mL$ 농도에서 69.67-100.87%의 저해 활성을 나타내었다. 또한, pro-collagen 생합성 역시 UVB를 조사한 후 분자량 100 kDa 이상 $0.05-0.5{\mu}g/mL$ 농도에서 64.91-77.80%의 합성능을 나타내어 농도 의존적으로 증가하는 것을 확인하였다. 따라서, 불등풀가사리 유래 산가수분해된 다당류의 분자량에 따른 주름 개선 효과를 통해 피부 항노화 기능성 소재로 다양하게 활용 가능할 것으로 사료된다.