• 대한약침학회지
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• 제25권1호
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• pp.37-45
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• 2022

Objectives: The quorum-sensing-inhibitory and anti-biofilm activities of the methanol extract of E. globulus leaves were determined against clinically isolated multidrug-resistant Pseudomonas aeruginosa. Methods: The preliminary anti-quorum-sensing (AQS) activity of eucalyptus was investigated against a biosensor strain Chromobacterium violaceum ATCC 12472 (CV12472) by using the agar well diffusion method. The effect of sub-minimum inhibitory concentrations (sub-MICs) of the methanol extract of eucalyptus on different quorum-sensing-regulated virulence factors, such as swarming motility, pyocyanin pigment, exopolysaccharide (EPS), and biofilm formation, against clinical isolates (CIs 2, 3, and 4) and reference PA01 of Pseudomonas aeruginosa were determined using the swarm diameter (mm)-measurement method, chloroform extraction method, phenol (5%)-sulphuric acid (concentrated) method, and the microtiter plate assay respectively, and the inhibition (%) in formation were calculated. Results: The preliminary AQS activity (violacein pigment inhibition) of eucalyptus was confirmed against Chromobacterium violaceum ATCC 12472 (CV12472). The eucalyptus extract also showed concentration-dependent inhibition (%) of swarming motility, pyocyanin pigment, EPS, and biofilm formation in different CIs and PA01 of P. aeruginosa. Conclusion: Our results revealed the effectiveness of the E. globulus extract for the regulation of quorum-sensing-dependent virulence factors and biofilm formation at a reduced dose (sub-MICs) and suggest that E. globulus may be a therapeutic agent for curing and controlling bacterial infection and thereby reducing the possibility of resistance development in pathogenic strains.

• Journal of Korean Neurosurgical Society
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• 제66권2호
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• pp.133-143
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• 2023

Objective : The types and functions of lipids involved in glioblastoma (GB) are not well known. Lipidomics is a new field that examines cellular lipids on a large scale and novel aplication of lipidomics in the biomedical sciences have emerged. This study aimed to investigate the potential of blood lipids for use as biomarkers for the diagnosis of GB via untargated lipidomic approach. Gaining a deeper understanding of lipid metabolism in patients with GB can contribute to the early diagnosis with GB patiens and also development of novel and better therapeutic options. Methods : This study was performed using blood samples collected from 14 patients (eight females and six males) and 14 controls (eight females and six males). Lipids were extracted from blood samples and quantified using phosphorus assay. Lipid profiles of between patients with GB and controls were compared via an untargeted lipidomics approach using 6530 Accurate-Mass Q-TOF LC/MS mass spectrometer. Results : According to the results obtained using the untargeted lipidomics approach, differentially regulated lipid species, including fatty acid (FA), glycerolipid (GL), glycerophospholipid (PG), saccharolipid (SL), sphingolipid (SP), and sterol lipid (ST) were identified between in patients with GB and controls. Conclusion : Differentially regulated lipids were identified in patients with GB, and these lipid species were predicted as potential biomarkers for diagnosis of GB.

• 센서학회지
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• 제33권3호
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• pp.158-164
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• 2024

We developed a self-operated paper pump that can maintain a nearly constant flow rate of an aqueous solution along a paper strip channel in paper-based analytical devices (PADs). The quasi-stationary flow rate was controlled by increasing the crosssectional channel area (capillary force) using a fan-shaped absorption pad coupled with a paper strip channel. The flow rate is regulated by varying the fan angle of the circular absorbing pad. Furthermore, the flow rate can be increased by furnishing a hollow cavity at the center of a conventional paper strip channel. The rate was regulated by varying the length of the hollow paper channel in the flow rate range of 5.1-26.4 mm/min. As a preliminary work, a paper-pump-coupled PAD was fabricated, and its CV detection capability was evaluated for the redox reaction of Fe(CN)₆^+4/+3. The combination of a paper pump with a PAD resulted in an ideal CV curve with a higher limiting current and faster response time. These results are interpreted well by the Levich equation, which suggests that the paper pump is a very useful component in paper-based sensors.

• Nutritional Sciences
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• 제6권3호
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• pp.148-154
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• 2003

Although various raw plant materials have been demonstrated to exert anti-obesity effects to a greater or lesser extent in both humans and animals when they are used to supplement the diet, it has not been shown extensively that they influence adipocyte cell differentiation involving lipid metabolic gene expressions. Using a well-established 3T3-L1 preadipocyte differentiation system, we decided to look into molecular and cellular event occurring during adipocyte differentiation when raw plant materials aye included in the process, in an effort to demonstrate the potential use of a screening system to define the functions of traditionally well-known materials. To these ends, the effects of ethanol (EtOH) or EtOH/distilled water (DW) extracts of Wax Gourd were examined using cytochemical and molecular analyses to determine whether components of the extracts modulate adipocyte differentiation of 3T3-Ll preadipocytes in vitro. The cytochemical results demonstrated that EtOH or EtOH/DW extracts did not affect lipid accumulation and cell proliferation, although the degree of lipid accumulation was influenced slightly depending on the extract. EtOH extract was highly effective in apoptotic induction during differentiation of 3T3-Ll preadipocytes (p<0.05). Reverse transcription-polymerase chain reaction (RT-PCR) analysis of lipoprotein lipase (LPL), Uncoupling protein (Ucp) 2, 3 and 4 also showed that while LPL expression was not influenced, Ucp2, 3 and 4 were up regulated in the EtOH extract-treated group and down regulated in the EtOH/DW extract-treated group. These changes in gene expressions suggest that the components in different fractions of Wax Gourd extracts may modulate lipid metabolism by either direct or indirect action. Taking these results together, it was concluded that molecular and cellular analyses of adipocyte differentiation involving lipid metabolic genes should facilitate understanding of cellular events occurring during adipocyte differentiation. Furthermore, the experimental scheme and analytical methods used in this study should provide a screening system for the functional study of raw plant materials in obesity research.

• 대한본초학회지
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• 제22권2호
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• pp.147-153
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• 2007

Objectives : Sophora flavescens (SF) is widely used in traditional herbal medicine in Korea and is well recognized for its anti-inflammatory effect. However, its effect on Tumornecrosis factor alpha (Tnf) production in BV2 microglial cell is not yet known. Methods : We investigated the effect of SF on the production and expression of Tnf, a well known inflammatory mediator, in lipopolysaccaride (LPS)-activated BV2 microglial cells. Results : The LPS-induced Tnf production was markedly reduced by treatment with SF (50 ${\mu}g/ml$). In reverse transcription polymerase chain reaction (RT-PCR) analysis, SF suppressed the LPS activated expression of Tnf mRNA. In addition, Western blot analysis confirmed that SF suppressed the expression of Tnf. Sophora flavescens also inhibited the LPS-induced phosphylation of extracellular signal-regulated kinases (ERK), which mediate the Tnfproduction signaling pathway whereas LPS-induced phosphylation of p38 mitogen activated protein kinase (p38 MAPK), and c-Jun NH2-terminal kinases (JNK) was not inhibited by SF, which implies that SF suppresses LPS-induced Tnf production via the ERK mediated pathway. Conclusion : Taken together, these findings indicated that SF inhibits LPS-induce Tnf production, and that this inhibitory effect is mediated via the ERK pathway.

• Natural Product Sciences
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• 제26권3호
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• pp.191-199
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• 2020

Fucoidan, a natural component of brown seaweed, has various biological activities such as anti-cancer activity, anti-oxidant, and anti-inflammatory against various cancer cells. However, the fucoidan has been implicated in melanoma cells via apoptosis signaling pathway. Therefore, we investigated apoptosis with fucoidan in A2058 human melanoma cells with dose- and time-dependent manners. In our results, A2058 cells viability decreased at relatively short-time and low-concentration through fucoidan. This effects of fucoidan on A2058 cells appeared to be mediated by the induction of apoptosis, as manifested by morphological changes through DNA-binding dye Hoechst 33342 staining. When a dose of 80 ㎍/mL fucoidan was treated, the cells were observed: crescent or ring-like structure, chromatin condensation, and nuclear fragmentation. With the increase at 100 ㎍/mL fucoidan, the cell membrane is intact throughout the total process, including membrane blebbing and loss of membrane integrity as well as increase of sub-G1 DNA. Furthermore, to understand the exact mechanism of fucoidan-treated in A2058 cells, western blotting was performed to detect apoptosis-related protein expression. In this study, Bcl-2 family proteins can be regulated by fucoidan, suggesting that fucoidan-induced apoptosis is modulated by intrinsic pathway. Therefore, expression of Bcl-2 and Bax may result in altered permeability, activating caspase-3 and caspase-9. And the cleaved form of poly ADP-ribose polymerase was detected in fucoidan-treated A2058 cells. These results suggest that A2058 cells are highly sensitive to growth inhibition by fucoidan via apoptosis, as evidenced by activation of extracellular signal-regulated kinases/p38/Bcl-2 family signaling, as well as alteration in caspase-9 and caspase-3.

• Journal of Acupuncture Research
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• 제19권2호
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• pp.28-38
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• 2002

Objective : This study is aimed to investigate the effects of bee venom and purified bee venom on cell death in synovial cell line. Methods : It was evaluated by using MTT assay, morphological method, flow cytometry, immunocytochemistry analysis, RT-PCR. Results : The result obtained is as follows. 1. The MTT assay demonstrated that synovial cell viability was significantly inhibitted dose-dependently by treatment with BV and PBV in comparison with control. And the inhibitory effect of BV and PBV was almost same. 2. The morphologic study demonstrated that synovial cell showed apoptotic body resulted from apoptosis after treatment with BV and PBV for 6 hours using microscope. 3. The Flow cytometry demonstrated that apoptosis of synovial cell treated with BV and PBV was related with stop of cell cycle in stage of G0/G1. 4. Immunocytochemistry assay demonstrated that COX-II and iNOS were slightly expressed by treatment with BV and PBV in comparison with control group. 5. RT-PCR analysis demonstrated that COX-II were almost down-regulated by high dose treatment with BV and PBV in comparison with control group. iNOS were well down-regulated by treatment with $5{\mu}g/ml$ BV and PBV whereas it was well expressed in control group. Conclusion : These results suggest that bee venom and purified bee venom have significant effect on cell death in synovial cell line and further study is needed in vivo.

• Molecules and Cells
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• 제21권3호
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• pp.381-388
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• 2006

Heat shock proteins (Hsp) 70 are a ubiquitous family of molecular chaperones involved in many cellular processes. A yeast strain, ssa1/2, with two functionally redundant cytosolic Hsp70s (SSA1 and SSA2) deleted shows thermotolerance comparable to mildly heatshocked wild type yeast, as well as increased protein synthesis and ubiquitin-proteasome protein degradation. Since mRNA abundance does not always correlate well with protein expression levels it is essential to study proteins directly. We used a gel-based approach to identify stress-responsive proteins in the ssa1/2 mutant and identified 43 differentially expressed spots. These were trypsin-digested and analyzed by nano electrospray ionization liquid chromatography tandem mass spectrometry (nESI-LC-MS/MS). A total of 22 non-redundant proteins were identified, 11 of which were confirmed by N-terminal sequencing. Nine proteins, most of which were up-regulated (2-fold or more) in the ssa1/2 mutant, proved to be stress-inducible proteins such as molecular chaperones and anti-oxidant proteins, or proteins related to carbohydrate metabolism. Interestingly, a translational factor Hyp2p up-regulated in the mutant was also found to be highly phosphorylated. These results indicate that the cytosolic Hsp70s, Ssa1p and Ssa2p, regulate an abundance of proteins mainly involved in stress responses and protein synthesis.

• 대한한방부인과학회지
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• 제19권2호
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• pp.92-106
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• 2006

Purpose : To address the ability of Olibanum to induce cell death, we investigated the effect of olibanum on cell apoptosis. Twenty-four hours later, apoptosis occurred following olibanum exposure in a dose-dependent manner. Methods : We culture HeLa cell which is human metrocarcinoma cell in D-MEM included 10% fetal bovine serum(Hyclone Laboratories) below $37^{\circ}C$, 5% CO2. Then we observed apoptosis of log phage cell which is changed cultivation liquid 24 Hours periodically. Results : The treatment of BAPTA-AM regulated olibanum-induced apoptosis in HeLa human cervical carcinoma cells. The 24 hr-earlier -thapsigargin-pretreated cell showed the resistance against olibanum-induced apoptosis and the Ru360-mitochondrial uniporter-inhibited olibanum-induced apoptosis, too. It means that olibanum leads to the accumulation of calcium and the resultant apoptosis in HeLa cells. Immunoblotting data also shows that the expression of GRP78, ER stress marker protein, was induced by the olibanum. Bcl-2, anti-apototic protein, was decreased and that the expression of Bax, pro-apoptotic protein, was increased by the addition of olibanum. Interestingly, the olibanum increased the activity of caspase-8 as well as calpain cysteine pretense in HeLa cervical carcinoma cells. Calpain inhibitor-calpastatin as well as caspase-8C/A expression abrogated olibanum-induced apoptosis in the carcinoma cells. The inhibition of caspase-8 regulated olibanum-induced calpain activation but the inhibition of calpain did not have any effect on the caspase-8 activation in HeLa human cervical carcinoma cells. Conclusion : We conclude that olibanum induces the accumulation of calcium and the resultant apoptosis in which caspase-8 and calpain are involved.

• 지구물리와물리탐사
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• 제12권3호
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• pp.233-238
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• 2009

시추공 주시 토모그래피의 주요 요소 중 하나인 초동주시의 측정오차 정보를 사용한 주시 토모그래피 법을 제안하고, 이 역산 방법을 실제 시추공 탐사 자료에 적용하는 실험을 수행 하였다. 제안된 역산방법은 2단계 제어 처리 공정이다. 1) 성취하고자하는 속도 영상의 분해능에 기초하여 측정 주시의 허용 오차한계를 설정하고 측정오차가 오차한계 이상인 기록은 역산에서 제외한다. 2) 반복역산 과정에서 계산된 주시 차 중에서 해당기록의 측정오차 보다 작은 주시 차를 0(영) 처리함으로써 무의미한 수치가 누적되어 속도 개선에 기여함을 방지한다. 모든 기록을 사용한 속도영상과 제어역산으로 도출한 속도영상을 비교한 결과에 의하면, 제어 역산으로 도출한 속도영상에서 수치잡음이 상대적으로 적게 표출되었다. 그리고 Fermat 원리에 의하면, 이 영상이 보다 현실가능성이 높은 속도모델임을 확인하였다.