• Molecules and Cells
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• 제22권2호
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• pp.228-232
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• 2006

The Drosophila protein, Rbp9, is homologous to human Hu, which is reported to be involved in small cell lung cancer. Rbp9 functions in cystocyte differentiation, and mutations in Rbp9 cause ovarian tumors. Here we show that the antimicrobial peptide, Attacin, is upregulated in Rbp9 mutants, especially in ovaries where tumors form. Upregulation seems to result from activation of the NF-${\kappa}B$ pathway since we detected nuclear localization of Relish in Rbp9 mutant ovaries but not in wild type ovaries. Inactivation of NF-${\kappa}B$ in the Rbp9 mutant allows prolonged survival of malformed egg chambers. We conclude that Drosophila initiates an anti-tumor defense response via activation of NF-${\kappa}B$.

• 통합자연과학논문집
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• 제7권4호
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• pp.234-240
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• 2014

C-C chemokine receptor type 4 (CCR4) is a chemokine receptor with seven transmembrane helices and it belongs to the GPCR family. It plays an important role in asthma, lung disease, atopic dermatitis, allergic bronchopulmonary aspergillosis, cancer, inflammatory bowel disease, the mosquito-borne tropical diseases, such as dengue fever and allergic rhinitis. Because of its role in wide spectrum of disease processes, CCR4 is considered to be an important drug target. Three dimensional structure of the protein is essential to determine the functions. In the present study homology modeling of human CCR4 was performed based on crystal structure of CCR5 chemokine receptor. The generated models were validated using various parameters. Among the generated homology models the best one is selected based on validation result. The model can be used for performing further docking studies to identifying the critical interacting residues.

• 혜화의학회지
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• 제9권1호
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• pp.169-182
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• 2000

To evaluate the antitumor activity and antimetastatic effects of Bujeongyangeumtang(BJYET), studies were done experimentally. The results were obtained as follows: 1. BJYET extracts exhibited a significant cytotoxicity against A549, SK-MEL-2, SK-OV-3 and B16-BL6 cell lines. 2. The T/C% was 118.2% in BJYET treated group in S-180 bearing ICR mice. 3. BJYET extracts exhibited inefficient adhesive effect of A549, B16-BL6 cell to complex extracellular matrix. 4. BJYET extracts showed a significant inhibition of lung metastasis of B16-BL6 cells in C57BL/6. 5. In vitro neovascularization assays, angiogenesis was significantly inhibited in BJYET treated group than control group. These results suggested that BJYET extracts might be usefully applied for prevention and treatment of cancer.

• 대한약학회:학술대회논문집
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• 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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• pp.354.2-354.2
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• 2002

Fifty of 3.4-diaryl-2(5H)-furanone derivatives were synthesized and evaluated for their cytotoxicity in a small panel of cancer cell lines. Eleven compounds in this series, were found to have significant cytotoxic activities with ED$_{50}$ values of less than 1 4{\mu}$M in most of the cell lines tested. Compound RTMSI, 3-(3.4, 5-trimethoxyphenyl)-4-(3-amino-4-methylamino)-2(5H)-furanone exhibited the most potent cytotoxic activity with ED$_{50}$ value of 0.003 4{\mu}$M and antitumor activity on BDF1 mice bearing Lewis lung carcinoma cells with inhibition ratio of 72 %.%.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.157.3-158
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• 2003

The antioxidant and anticancer properties of a medicinal plant, Betula platyphylla var. japonica were investigated. The total methanol extract of B. platyphylla var. japonica had protective effects against hydrogen peroxide ($H_2O_2$) in the Chinese hamster lung fibroblast (V79-4) cell line and induced apoptotic cell death in human promyelocytic leukemia (HL-60) cells, a cancer cell line. B. platyphylla var. japonica extract significantly increased cell viability against $H_2O_2$. The extract also showed high 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity ($IC_50$ 2.4 mg/ml) and lipid peroxidation inhibitory activity ($IC_50$ below 4.0 mg/ml). (omitted)

• 대한세포병리학회지
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• 제9권1호
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• pp.15-20
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• 1998

Mutant form of the p53 gene product is abnormally accumulated in the nuclei of the tumor cells due to prolonged half life, and readily detected by immunohistochemical methods. To determine the positivity rate of p53 in body cavity fluid according the primary site and histological types of tumors and the utility of p53 immunostaining as an adjunct in the diagnosis of malignancy, we reviewed 69 effusions, including pleural effusion, ascitic fluid, and pericardial fluid, that were diagnosed as overt malignancy and 21 effusions of suspicious malignancy, immunohistochemistry was performed on paraffin-embedded cell blocks using a monoclonal antibody to p53 supressor gene product(Clone DO7) and a standard avidin-biotin complex technique with a citrate buffer antigen retrieval solution. The results were as follows; of the 46 pleural effusions with overt malignancy, 22 were immunopositive for p53 protein; of the 21 ascitic fluids with overt malignancy, 5 were positive for p53. Positivity rates according to the primary sites of tumors were 18 of 34(52.9%), 8 of 21(38.1%), 1 of 9(11.1%) cases of the tumors of the lung, GI tract, and ovary, respectively. According to the histologic types of lung cancer, 11 cases(61.6%) were positive out of 18 adenocarcinomas, 2 of 5 large cell undifferentiated carcinomas, and 1 of 2 small cell undifferentiated carcinomas. Of 21 cases of suspicious malignancy, 6 were positive for p53 and all of them(6/6) were confirmed as adenocarcinoma of the lung or GI tract. These findings indicate that p53 immunostaining using paraffin embedded cell block is useful diagnostic and prognostic marker in body fluid cytology although negative immunostaining does not exclude malignancy.

• Molecules and Cells
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• 제40권4호
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• pp.254-261
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• 2017

Glioblastomas (GBM) are very difficult to treat and their aggressiveness is one of the main reasons for this as well as for the frequent recurrences. MicroRNAs post-transcriptionally regulate their target genes through interaction between their seed sequence and 3'UTR of the target mRNAs. We previously reported that miR-296-3p is regulated by neurofibromatosis 2 (NF2) and enhances the invasiveness of GBM cells via SOCS2/STAT3. In this study, we investigated whether miR-296-5p, which originates from the same precursor miRNA as miR-296-3p, can increase the invasiveness of GBM cells. It was observed that miR-296-5p potentiated the invasion of various GBM cells including LN229, T98G, and U87MG. Through bioinformatics approaches, two genes were identified as miR-296-5p targets: caspase-8 (CASP8) and nerve growth factor receptor (NGFR). From results obtained from Ago2 immunoprecipitation and luciferase assays, we found that miR-296-5p downregulates CASP8 and NGFR through direct interaction between seed sequence of the miRNA and 3'UTR of the target mRNA. Knockdown of CASP8 or NGFR also increased the invasive ability of GBM cells, indicating that CASP8 and NGFR are involved in potentiation of invasiveness by miR-296-5p. Consistent with our findings, CASP8 was downregulated in brain metastatic lung cancer cells, which have a high level of miR-296-5p, compared to parental cells, suggesting that miR-296-5p may be generally associated with the acquisition of invasiveness. Collectively, our results implicate miR-296-5p as a potential cause of invasiveness in cancer and suggest it as a promising therapeutic target for GBM.

• 생명과학회지
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• 제32권3호
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• pp.263-269
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• 2022

암 악액질은 암으로 인한 다기관 대사성 질환으로 식욕부진과 체중 감소가 주요 증상이다. 일반적으로 암 환자의 식욕부진과 체중감소는 항암화학요법 치료와 암 환자의 생존율에 악영향을 미치는 심각한 문제이다. 암 악액질은 일반적으로 췌장암, 폐암, 결장암 등 소화기관 암 환자의 약 80%에서 동반되는 것으로 알려져 있으며, 림프종이나 유방암 환자에서는 비교적 드물다. 암 악액질에 의한 식욕부진은 화학요법에 의해서도 일어나지만, 화학요법과는 독립적으로 발생하는 것으로 알려져 있다. 암 악액질의 발병기전으로는 종양 조직에 의해 과도하게 증가되는 염증성 사이토카인에 의한 정상 조직 기능의 저하가 주요 원인이다. 암 악액질의 메커니즘은 아직 완전히 이해되지 않았기 때문에 현재 악액질을 치료할 치료제나 진단 바이오마커가 없는 실정이다. 최근 발표된 연구에서는 암세포에서 분비되는 물질이 악액질에 의한 식욕억제를 일으키는 것이 확인되었고 그 분자생물학적 기전이 밝혀졌다. 이 물질의 발현 및 분비 증가는 암 환자의 악액질 증상과 통계적으로 상관관계가 있는 것으로 밝혀져 암악액질 진단 및 치료제 개발에 활용될 것으로 기대된다. 이 논문에서는 암 악액질의 주요증상인 섭식장애와 체중감소의 이해를 돕고자 알려진 원인과 분자 기전들의 내용을 소개하겠다.

• 대한한방내과학회지
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• 제30권2호
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• pp.399-409
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• 2009

Objectives : The aim of this study was to experiment the antitumor activity of Agrimonia pilosa Ledebour (APL) in human stomach cancer (AGS) cell lines (in vitro) and male C57BL/6J mouse (in vivo). Methods : The effects of the ethanol extract from the plant on several transplantable rodent tumors were investigated in vitro by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxy phenyl)-2-(4-sulfophenyl)-2H-tetrazolium, inner salt (MTS) assay. DNA content analysis and Western blot analysis. Agrimonia pilosa Ledebour (APL) was given to rats with Lewis Lung Carcinoma (LLC) cells. The experimental rats were divided into 3 groups in vivo. Saline was injected into the abdominal cavity in the first group, 50 mg/kg APL was injected into the abdominal cavity in the second group and 100 mg/kg was injected into the abdominal cavity in the third group. After that, we checked their tumor volume periodically. Results : At first, human gastric cancer (AGS) cell lines (in vitro) showed decreased cell viability, and increased $sub-G_1$ contents. When we experimented rat intestinal epithelial (RIE)l as same condition, this result didn't show. With this, compared to normal cells, Agrimonia pilosa Ledebour (APL) led selectively to the extinction of cells only in human gastric cancer. Moreover, we showed that the traditional herbal medicine APL induced caspase-dependent apoptosis in AGS cells. Next, APL inhibited the growth of LLC-bearing mouse tumor. However, we could not verify APL induced caspase-dependent apoptosis in LLC-bearing mouse tumor. Conclusions : The roots of Agrimonia pilosa Ledebour (APL) contain some antitumor constituents.

• 생명과학회지
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• 제33권9호
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• pp.693-702
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• 2023

이 연구는 우리 몸에서 포도당 및 에너지 대사에 관련된 호르몬으로 알려진 티록신 및 당질코르티코이드를 지방분화배양액에 단용 혹은 혼용 첨가하여 A549 폐암세포주가 지방세포로의 분화에 미치는 영향을 조사하였다. 각 지방분화배양액에서 A549세포를 2주 동안 배양한 후, A549세포의 세포 성장률과 말단효소 복원효소를 비교하였을 때, 기본 지방분화배양액이나 PGZ기반 지방분화배양액에서 티록신 및 당질코르티코이드가 단용으로 첨가된 경우보다, 두 호르몬이 혼용으로 첨가되었을 때, 세포의 성장의 유의적으로 억제되는 것을 알 수 있었다. 또한, 세포내 축적된 지방 분자를 염색할 수 있는 Oil Red O 염색과 분화된 지방세포에서 분비되는 여러 아디포카인의 발현을 조사하여 각 지방분화배양액에서 A549 세포의 지방분화능력을 비교하였다. 지방세포로의 분화 능력 역시 티록신 및 당질코르티코이드가 단용으로 첨가된 경우 보다, 두 호르몬이 혼용으로 첨가되었을 때, Oil Red O 염색액으로 염색된 세포내 지방 과립의 수와 크기가 유의적으로 증가하는 것을 알 수 있었고, 아디포카인의 발현 유의적으로 증가하는 것을 알 수 있었다. 이러한 연구 결과를 바탕으로 A549 세포에서 지방세포의 분화를 유도할 때, 포도당 대사 관련 두 호르몬의 혼용 처리가 더욱 더 세포 분화를 촉진한다는 것을 알 수 있었고, 여러 다른 암세포주를 두 호르몬을 혼용하여 첨가한 지방분화배양액에서 처리하여 지방 분화 유도에 의한 세포 성장 억제 효과가 가능할 것으로 판단된다. 그러나, 체내의 다른 세포, 특히 미분화 줄기세포에 미치는 영향에 대한 추가적인 연구가 필요할 것으로 판단된다.