• 한국식물생명공학회:학술대회논문집
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• 한국식물생명공학회 2005년도 추계학술대회 및 한일 식물생명공학 심포지엄
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• pp.229-229
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• 2005

• Bulletin of the Korean Chemical Society
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• 제35권8호
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• pp.2317-2325
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• 2014

P-glycoprotein (P-gp) is a member of the ATP-Binding Cassette transporter superfamily and mediates transmembrane efflux of many drugs. Since it is involved in multi-drug resistance activity in various cancer cells, the development of P-gp inhibitor is one of the major concerns in anticancer therapy. Human P-gp protein has at least two "functional" drug binding sites that are called "H" site and "R" site, hence it has multi-binding-specificities. Though the amino acid residues that constitute in drug binding pockets have been proposed by previous experimental evidences, the shapes and the binding poses are not revealed clearly yet. In this study, human P-gp structure was built by homology modeling with available crystal structure of mouse P-gp as a template and docking simulations were performed with inhibitors such as verapamil, hoechst33342, and rhodamine123 to construct the interaction between human P-gp and its inhibitors. The docking simulations were performed 500 times for each inhibitor, and then the interaction frequency of the amino acids at the binding poses was analyzed. With the analysis results, we proposed highly contributing residues that constitute binding pockets of the human P-gp for the inhibitors. Using the highly contributing residues, we proposed the locations and the shapes of verapamil binding site and "R" site, and suggested the possible position of "H" site.

• Asian Pacific Journal of Cancer Prevention
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• 제13권6호
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• pp.2979-2984
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• 2012

Recent studies have indicated a link between levels of cyclooxygenase-2 (COX-2) and development of the multidrug resistance (MDR) phenotype. The ATP-binding cassette sub-family G member 2 (ABCG2) is a major MDR-related transporter protein that is frequently overexpressed in cancer patients. In this study, we aimed to evaluate any positive correlation between COX-2 and ABCG2 gene expression using the COX-2 inducer 12-O-tetradecanoylphorbol-13-acetate (TPA) in human breast cancer cell lines. ABCG2 mRNA and protein expression was studied using real-time RT-PCR and flow cytometry, respectively. A significant increase of COX-2 mRNA expression (up to 11-fold by 4 h) was induced by TPA in MDA-MB-231 cells, this induction effect being lower in MCF-7 cells. TPA caused a considerable increase up to 9-fold in ABCG2 mRNA expression in parental MCF-7 cells, while it caused a small enhancement in ABCG2 expression up to 67 % by 4 h followed by a time-dependent decrease in ABCG2 mRNA expression in MDA-MB-231 cells. TPA treatment resulted in a slight increase of ABCG2 protein expression in MCF-7 cells, while a time-dependent decrease in ABCG2 protein expression was occurred in MDA-MB-231 cells. In conclusion, based on the observed effects of TPA in MDA-Mb-231 cells, it is proposed that TPA up-regulates ABCG2 expression in the drug sensitive MCF-7 breast cancer cell line through COX-2 unrelated pathways.

• Nutrition Research and Practice
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• 제8권1호
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• pp.20-26
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• 2014

Obesity is an epidemic disease characterized by an increased inflammatory state and chronic oxidative stress with high levels of pro-inflammatory cytokines and lipid peroxidation. Moreover, obesity alters cholesterol metabolism with increases in low-density lipoprotein (LDL) cholesterols and triglycerides and decreases in high-density lipoprotein (HDL) cholesterols. It has been shown that mulberry leaf and fruit ameliorated hyperglycemic and hyperlipidemic conditions in obese and diabetic subjects. We hypothesized that supplementation with mulberry leaf combined with mulberry fruit (MLFE) ameliorate cholesterol transfer proteins accompanied by reduction of oxidative stress in the high fat diet induced obesity. Mice were fed control diet (CON) or high fat diet (HF) for 9 weeks. After obesity was induced, the mice were administered either the HF or the HF with combination of equal amount of mulberry leaf and fruit extract (MLFE) at 500mg/kg/day by gavage for 12 weeks. MLFE treatment ameliorated HF induced oxidative stress demonstrated by 4-hydroxynonenal (4-HNE) and modulated the expression of 2 key proteins involved in cholesterol transfer such as scavenger receptor class B type 1 (SR-B1) and ATP-binding cassette transporter A1 (ABCA1) in the HF treated animals. This effect was mainly noted in liver tissue rather than in cutaneous tissue. Collectively, this study demonstrated that MLFE treatment has beneficial effects on the modulation of high fat diet-induced oxidative stress and on the regulation of cholesterol transporters. These results suggest that MLFE might be a beneficial substance for conventional therapies to treat obesity and its complications.

• Asian Pacific Journal of Cancer Prevention
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• 제16권16호
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• pp.6831-6839
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• 2015

Multidrug resistance is a principal mechanism by which tumors become resistant to structurally and functionally unrelated anticancer drugs. Resistance to chemotherapy has been correlated with overexpression of p-glycoprotein (p-gp), a member of the ATP-binding cassette (ABC) superfamily of membrane transporters. P-gp mediates resistance to a broad-spectrum of anticancer drugs including doxorubicin, taxol, and vinca alkaloids by actively expelling the drugs from cells. Use of specific inhibitors/blocker of p-gp in combination with clinically important anticancer drugs has emerged as a new paradigm for overcoming multidrug resistance. The aim of this paper is to review p-gp regulation by dietary nutraceuticals and to correlate this dietary nutraceutical induced-modulation of p-gp with activity of anticancer drugs.

• 한국광과학회:학술대회논문집
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• 한국광과학회 2002년도 정기총회 및 제9회 광과학 학술심포지움 논문초록
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• pp.69-69
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• 2002

• 한국자원식물학회지
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• 제22권3호
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• pp.273-280
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• 2009

A cDNA clone encoding a MDR-like ABC transporter protein was isolated from Brassica rapa seedlings, through rapid amplification of cDNA ends (RACE). This gene (named as Brmdr 1; GenBank accession no.: DQ296184 ) had a total length of 4222 bp with an open reading frame of 3900 bp, and encoded a predicted polypeptide of 1300 amino acids with a molecular weight of 143.1 kDa. The BrMDR1 protein shared 71.0, 62.5, 60.0 and 58.2% identity with other MDR proteins isolated from Arabidopsis thaliana (AAN28720), Coptis japonica (CjMDR), Gossypium hirsutum (GhMDR) and Triticum aestivum (TaMDR) at amino acid level, respectively. Southern blot analysis showed that Brmdr1 was a low-copy gene. Expression pattern analysis revealed that Brmdr1 constitutively expressed in the root, stem petals and stamens, but with lower expression in leaves and open flowers. The domains analysis showed that BrMDR1 protein possessed two transmembrane domains (TMDs) and two nucleotide binding domains (NBDs) arranging in "TMD1-NBD1-TMD2-NBD2" direction, which is consistent with other MDR transporters. Within NBDs three characteristic motifs common to all ABC transporters, "Walker A", "Walker B" and C motif, were found. These results indicate that BrMDR1 is a MDR-like ABC transporter protein that may be involved in the transport and accumulation of secondary metabolites.

• Asian-Australasian Journal of Animal Sciences
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• 제30권5호
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• pp.643-652
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• 2017

Objective: Prostaglandins (PGs) function in various reproductive processes, including luteolysis, maternal pregnancy recognition, conceptus development, and parturition. Our earlier study has shown that PG transporters ATP-binding cassette, subfamily C, member 4 (ABCC4) and solute carrier organic anion transporter family, member 2A1 (SLCO2A1) are expressed in the uterine endometrium in pigs. Since several other PG transporters such as ABCC1, ABCC9, SLCO4C1, and SLCO5A1 are known to be present in the uterine endometrium, this study investigated the expression of these PG transporters in the porcine uterine endometrium and placenta. Methods: Uterine endometrial tissues were obtained from gilts on day (D) 12 and D15 of the estrous cycle and days 12, 15, 30, 60, 90, and 114 of pregnancy. Results: ABCC1, ABCC9, SLCO4C1, and SLCO5A1 mRNAs were expressed in the uterine endometrium, and levels of expression changed during the estrous cycle and pregnancy. Expression of ABCC1 and ABCC9 mRNAs was localized mainly to luminal and glandular epithelial cells in the uterine endometrium, and chorionic epithelial cells during pregnancy. Conceptuses during early pregnancy and chorioallantoic tissues from mid to late pregnancy also expressed these PG transporters. $Estradiol-17{\beta}$ increased the expression of ABCC1 and SLCO5A1, but not ABCC9 and SLCO4C1 mRNAs and increasing doses of $interleukin-1{\beta}$ induced the expression of ABCC9, SLCO4C1, and SLCO5A1 mRNAs in endometrial explant tissues. Conclusion: These data showed that several PG transporters such as ABCC1, ABCC9, SLCO4C1, and SLCO5A1 were expressed at the maternal-conceptus interface, suggesting that these PG transporters may play an important role in the establishment and maintenance of pregnancy by regulating PG transport in the uterine endometrium and placenta in pigs.

• 대한유전성대사질환학회지
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• 제12권1호
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• pp.49-53
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• 2012

X 연관 부신백질이영양증(adrenoleukodystrophy, ALD)은 과산화소체베타산화과정(peroxisomal ${\beta}$-oxidation)의 장애로 매우긴사슬지방산(very long chain fatty acids, VLCFA)이 신경계의 백질과 부신피질 및 고환에 축척된다. 이 질환은 과산화소체막단백질(peroxisomal membrane protein)을 형성하는 Xq28에 위치하는 ATP-binding cassette, subfamily D, member 1 (ABCD1) 유전자 돌연변이에 의해 주로 발생한다. X 연관 ALD는 다양한 임상양상을 보이는데 전형적인 소아대뇌형 부신백질이영양증은 10세 이전의 남아에서 대뇌백질에 빠르게 진행하는 탈수초현상을 보인다. 8세 된 남자 환아로 정상발달과정을 보이던 중 초등학교 입학 후에 집중장애와 산만한 모습으로 인해 주의력결핍과다활동장애로 진단받고 치료를 받았었다. 환아는 내원 8개월 전부터 말이 어눌해 지고 걸을 때 오른 발을 끌며 자주 넘어지는 모습을 보여 내원하였고 오른쪽 상, 하지의 근력이 떨어지는 양상이 관찰되었다. 검사상 부신기능저하증 소견을 보였으며 혈청 지방산 분석검사에서는 C26:0, C42:0/C22:0, C26:0/C22:0가 증가하였다. 뇌 자기공명영상에서는 T2와 FLAIR 강조영상에서 양측의 두정후두부의 백질과 소뇌의 백질에서 대칭적으로 고신호강도를 보였다. 환아는 부신백질이영양증로 진단하였고 ABCD1 유전자 분석 검사에서 새로운 c.983delT (p.Met329CysfsX7) 돌연변이가 확인되었다. X 연관 ALD는 유전자형과 표현형에 연관성이 없으며 다양한 임상양상을 보이기 때문에 환자들마다 임상증상을 잘 관찰해야 하며 향후 유전자 기능을 좀 더 파악하고 임상증상에 영향을 주는 다른 요소에 대한 연구가 필요할 것이라 사료된다.

• 대한임상검사과학회지
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• 제51권4호
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• pp.514-520
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• 2019

본 연구는 와송 유기용매 추출물중 DCM층을 이용하여 지방세포로 유도된 3T3-L1세포에 대한 지질대사 개선효과를 확인하는 연구이다. 세포독성을 확인하기 위하여 MTS-assay를 이용하여 6가지 분획의 와송 유기용매 추출물(EtOH, Hexane, DCM, EToAc, BuOH, H₂O)에 대한 독성검사를 실시하여 세포에 대한 안정성을 확인하였다. 그 결과 DCM추출물이 전 농도에 걸쳐 안정성이 있음을 확인하고, 지질대사 개선효과를 확인하기 위하여 DCM층을 사용하였다. 우선 지질대사 개선효과를 확인하기 위하여 지질 배출능을 측정하였다. 지방세포로 유도된 3T3-L1세포에 대하여 DCM추출물을 처리한 후 oil-red O염색을 실시하여 지질 축적량을 평가한 결과 지질 배출능이 개선된 것을 확인할 수 있었다. 또한 지질 배출능 분석을 위하여 지질수송 단백질인 ABCA1, ABCG1의 mRNA발현을 real-time PCR로 확인한 결과 DCM추출물 처리 시 유의적인 발현 증가가 나타났음을 확인 하였다. 따라서 본 연구를 통하여 와송 DCM추출물이 3T3-L1 지방세포에 대하여 지질대사 개선효과가 있음을 확인하였다.