• IMMUNE NETWORK
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• 제1권1호
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• pp.77-86
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• 2001

Background: Hepatitis C virus(HCV), a family of Flaviviridae, has a host cell-derived envelope containing a positive-stranded RNA genome, and has been known as the maj or etiological agent for chronic hepatitis, hepatic cirrhosis, and hepatocellular carcinoma. There remains a need to dissect a molecular mechanism of pathogenesis for the development of therapeutic and effective preventive measure for HCV. Identification of cellular receptor is of central importance not only to understand the viral pathogenesis, but also to exploit strategies for prevention of HCV. This study was aimed at identifying peptide mimotopes inhibiting the binding of E2 protein of HCV to MOLT-4 cell. Methods: In this study, phage peptide library displaying a random peptides consisting of 7 or 12 random peptides was employed in order to pan against E2 protein. Free HCV particles were separated from the immune complex forms by immunoprecipitation using anti-human IgG antibody, and used for HCV-capture ELISA. To identify the peptides inhibiting E2-binding to MOLT-4 cells, E2 protein was subj ect to bind to MOLT-4 cells under the competition with phage peptides. Results: Several phage peptides were selected for their specific binding to E2 protein, which showed the conserved sequence of SHFWRAP from 3 different peptide sequences. They were also able to recognize the HCV particles in the sera of HCV patients captured by monoclonal antibody against E2 protein. Two of them, showing peptide sequence of HLGPWMSHWFQR and WAPPLERSSLFY respectively, were revealed to inhibit the binding of E2 protein to MOLT-4 cell efficiently in dose dependent mode. However, few membrane-associated receptor candidates were seen using Fasta3 programe for homology search with these peptides. Conclusion: Phage peptides containing HLGPWMSHWFQR and WAPPLERSSLFY respectively, showed the inhibition of E2-binding to MOLT-4 cells. However, they did not reveal any homologues to cellular receptors from GenBank database. In further study, cellular receptor could be identified through the screening of cDNA library from MOLT-4 or hepatocytes using antibodies against these peptide mimotopes.

• Asian Pacific Journal of Cancer Prevention
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• 제13권11호
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• pp.5339-5343
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• 2012

The induction of apoptosis in target cells is a key mechanism for most anti-tumor therapies. Bufalin is a cardiotonic steroid that has the potential to induce differentiation and apoptosis of tumor cells. Research on bufalin has so far mainly involved leukemia, prostate cancer, gastric cancer and liver cancer, and has been confined to in vitro studies. The bufadienolides bufalin and cinobufagin have been shown to induce apoptosis in a wide spectrum of cancer cell. The present article reviews the anticancer effects of bufalin. It induces apoptosis of lung cancer cells via the PI3K/Akt pathway and also suppressed the proliferation of human non-small cell lung cancer A549 cell line in a time and dose dependent manner. Bufalin, bufotalin and gamabufotalin, key bufadienolides, significantly sensitize human breast cancer cells with differing ER-alpha status to apoptosis induction by the TNF-related apoptosis-inducing ligand (TRAIL). In addition, bufadienolides induce prostate cancer cell apoptosis more significantly than that in breast epithelial cell lines. Similar effects have been observed with hepatocellular carcinoma (HCC) but the detailed molecular mechanisms of inducing apoptosis in this case are still unclear. Bufalin exerts profound effects on leukemia therapy in vitro. Results of multiple studies indicate that bufalin has marked anti-tumor activities through its ability to induce apoptosis. Large-scale randomized, double-blind, placebo or positive drug parallel controlled studies are now required to confirm the efficacy and apoptosis-inducing potential of bufalin in various cancers in the cliniucal setting.

• Asian Pacific Journal of Cancer Prevention
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• 제16권5호
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• pp.2043-2049
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• 2015

Background: Serum Golgi protein 73 (GP73) as a novel and potential marker for diagnosing hepatocellular carcinoma (HCC) have been found to be elevated in HCC patients and associated with clinical variables representing tumor growth and invasiveness. The aim of this study was to prepare a pair of monoclonal antibodys (mAbs) against GP73 and develop a newly designed double-antibody sandwich enzyme-linked immunosorbent assay (s-ELISA), which would be used in the detection of serum GP73 (sGP73) as well as in the diagnosis of HCC. Materials and Methods: Produced by prokaryotic expression, the purified recombinant GP73 (rGP73), produced by prokaryotic expression, was used to immunize the Balb/c mice. Two hybridoma cell lines against GP73 were obtained by fusing mouse Sp2/0 myeloma cells with spleen cells from the immunized mice. The titers of anti-GP73 mAb reached 1:243,000. Western blotting analysis and Immunohistochemistry staining revealed that anti-GP73 mAb could recognize GP73 protein. The double-antibody s-ELISA was successfully established and validated by 119 HCC and 103 normal serum samples. Results: showed that the detection limit of this method could reach 1.56 ng/ml, and sGP73 levels in HCC group (mean=190.6 ng/ml) were much higher than those of in healthy controls (mean=70.92 ng/ml). Conclusions: Results of our study not only showed that sGP73 levels of HCC patients were significantly higher than those of healthy controls, but also indicated that the laboratory homemade anti-GP73 mAbs could be the optimal tool used in evaluating sGP73 levels, which would provide a solid foundation for subsequent clinical applications.

• Asian Pacific Journal of Cancer Prevention
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• 제16권5호
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• pp.1803-1811
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• 2015

Hepatoma-derived growth factor (HDGF) is a novel jack-of-all-trades in cancer. Here we quantify the prognostic impact of this biomarker and assess how consistent is its expression in solid tumors. A comprehensive search strategy was used to search relevant literature updated on October 3, 2014 in PubMed, EMBASE and WEB of Science. Correlations between HDGF expression and clinicopathological features or cancer prognosis was analyzed. All pooled HRs or ORs were derived from random-effects models. Twenty-six studies, primarily in Eastern Asia, covering 2,803 patients were included in the analysis, all of them published during the past decade. We found that HDGF overexpression was significantly associated with overall survival (OS) ($HR_{OS}=2.35$, 95%CI=2.04-2.71, p<0.001) and disease free survival (DFS) ($HR_{DFS}=2.25$, 95%CI =1.81-2.79, p<0.001) in solid tumors, especially in non-small cell lung cancer, hepatocellular carcinoma and cholangiocarcinoma (CCA). Moreover, multivariate survival analysis showed that HDGF overexpression was an independent predictor of poor prognosis ($HR_{OS}=2.41$, 95%CI: 2.02-2.81, p<0.001; $HR_{DFS}=2.39$, 95%CI: 1.77-3.24, p<0.001). In addition, HDGF overexpression was significantly associated with tumor category (T3-4 versus T1-2, OR=2.12, 95%CI: 1.17-3.83, p=0.013) and lymph node status (N+ versus N-, OR=2.37, 95%CI: 1.31-4.29, p=0.03) in CCA. This study provides a comprehensive examination of the literature available on the association of HDGF overexpression with OS, DFS and some clinicopathological features in solid tumors. Meta-analysis results provide evidence that HDGF may be a new indicator of poor cancer prognosis. Considering the limitations of the eligible studies, other large-scale prospective trials must be conducted to clarify the prognostic value of HDGF in predicting cancer survival.

• Molecules and Cells
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• 제38권6호
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• pp.528-534
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• 2015

Hypoxia-inducible factor (HIF) is a key regulator of tumor growth and angiogenesis. Recent studies have shown that, BIX01294, a G9a histone methyltransferase (HMT)-specific inhibitor, induces apoptosis and inhibits the proliferation, migration, and invasion of cancer cells. However, not many studies have investigated whether inhibition of G9a HMT can modulate HIF-$1{\alpha}$ stability and angiogenesis. Here, we show that BIX01294 dose-dependently decreases levels of HIF-$1{\alpha}$ in HepG2 human hepatocellular carcinoma cells. The half-life of HIF-$1{\alpha}$, expression of proline hydroxylase 2 (PHD2), hydroxylated HIF-$1{\alpha}$ and von Hippel-Lindau protein (pVHL) under hypoxic conditions were decreased by BIX01294. The mRNA expression and secretion of vascular endothelial growth factor (VEGF) were also significantly reduced by BIX01294 under hypoxic conditions in HepG2 cells. BIX01294 remarkably decreased angiogenic activity induced by VEGF in vitro, ex vivo, and in vivo, as demonstrated by assays using human umbilical vein endothelial cells (HUVECs), mouse aortic rings, and chick chorioallantoic membranes (CAMs), respectively. Furthermore, BIX01294 suppressed VEGF-induced matrix metalloproteinase 2 (MMP2) activity and inhibited VEGF-induced phosphorylation of VEGF receptor 2 (VEGFR-2), focal adhesion kinase (FAK), and paxillin in HUVECs. In addition, BIX01294 inhibited VEGF-induced formation of actin cytoskeletal stress fibers. In conclusion, we demonstrated that BIX01294 inhibits HIF-$1{\alpha}$ stability and VEGF-induced angiogenesis through the VEGFR-2 signaling pathway and actin cytoskeletal remodeling, indicating a promising approach for developing novel therapeutics to stop tumor progression.

• 대한본초학회지
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• 제22권3호
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• pp.27-37
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• 2007

Objectives: Hepatocellular carcinoma is the most common primary malignant tumor of the liver worldwide. In-Jin-Ho-Tang(IJHT) has been used as a traditional Chinese herbal medicine since ancient time. and today it is widely applied as a medication for jaundice which is associated with inflammation in liver. In this study, I investigated whether methanol extract of IJHT induced HepG2 cancer cell death. Methods: Cytotoxic activity of IJHT on HepG2 cells was using XTT assay. Apoptosis induction by Ros A in HCT116 cells was verified by the induction of cleavage of poly ADP-ribose polymerase (PARP). and activation of caspase-3, -8 and -9. The release of cytochrome c from mitochondria to cytosol. the level of Bcl-2 and Bax and the expression of p53 and p21 were examined by western blotting analysis. Furthermore, MAPKs activation was analyzed by western blotting analysis. Results: IJHT induced apoptosis in HepG2 cells. And treatment of IJHT resulted in the release of cytochrome c into cytosol, decreased anti-apoptotic Bcl-2, and increased pri-apoptotic Bax expression. IJHT markedly inactivated extracellular signal-regulated kinase (ERK1/2), and activated p38 mitogen-activated protein (MAP) kinase. Sodium orthovanadate (SOV), a phosphatase inhibitor, to reverse IJHT-induced ERK1/2 inactivation and SB203580, a specific p38 MAP Kinase inhibitor efficiently blocked apoptosis of HepG2. Thus, IJHT induces apoptosis in HepG2 cells via MAP kinase modulation. Conclusion: These results indicated that IJHT has some potential for use as an anti-cancer agent.

• 한국식품영양과학회지
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• 제42권12호
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• pp.1899-1907
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• 2013

복분자 미숙과 물추출물이 콜레스테롤 개선에 미치는 영향을 측정한 결과는 다음과 같다. 간세포주(HepG2 cells)에서 복분자 미숙과 물추출물은 SREBPs를 증가시킴으로써 혈액 내에 LDL을 LDL receptor를 통해서 세포 안으로 흡수시키고, 콜레스테롤 합성에 관여하는 HMG-CoA reductase 활성을 억제하면서 체내 콜레스테롤을 조절하였다. 그러나 HDL의 생성에 관여하는 유전자(ABCA1, SR-B1)는 변화를 보이지 않았다. 결과적으로 복분자 미숙과 물추출물이 LDL receptor를 통해서 LDL을 억제시키고 체내에서는 콜레스테롤 생합성을 억제하였으며, HDL의 생성에는 관여를 하지 않음을 확인하였다. 또한 ApoB1/ApoA1 ratio 값을 통해서 동맥경화 지표를 확인해 본 결과 유의성 있게 수치가 감소함을 확인하였고, 이는 미숙과 물추출물이 콜레스테롤을 개선하여 동맥경화를 예방할 것으로 기대한다. 또한 대식세포(RAW 264.7 cells)에서 복분자 미숙과 물추출물이 CD 36, SR-A 수용체를 억제시킴으로 인해 세포 내의 ox-LDL 의 흡수를 차단시키고, 세포 안에서는 macrophage에 있는 PPAR-${\gamma}$를 억제시킴으로 인해 LDL 산화가 억제되었다. Adipophilin의 활성이 억제됨에 따라 세포 안에 있는 콜레스테롤 방출을 촉진시킴으로 인해 동맥경화를 완화시킬 수 있다고 사료된다.

• 생명과학회지
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• 제25권9호
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• pp.1051-1058
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• 2015

본 연구에 평가된 감귤 돌연변이는 기존 궁천조생 품종에서 유래된 방사선 돌연변이체로 선행 연구에서 다양한 생리활성 및 기능성 성분이 함유되어 있다는 것을 보고한 이래로, 감귤 돌연변이의 항암 제제로써 활용 가능성을 검증하였다. 여러 암종(HCT116, 인간대장암세포; A375, 인간흑색종세포; Hela, 인간자궁경부암세포; MCF-7, 인간유방암세포; A549, 인간폐암세포; HepG2, 인간간암세포)을 대상으로 감귤 돌연변이의 항암 활성을 기존 궁천조생 품종(방사선 무처치군)과 비교 분석한 결과 그 효용 가치가 높게 나타났을 뿐 아니라 자연사멸 유도 메커니즘을 탐색하였을 때 감귤 돌연변이에 의해 야기된 apoptosis에 IAP family의 발현 저해와 NO^• pathway 증강에 따라 세포 고사가 촉진됨을 확인할 수 있었다. 또한 감귤 돌연변이가 정상 세포에 대한 독성을 유발하지 않는 것으로 나타나, 암세포 선택성이 높은 chemopreventive 및 chemotherapeutic agent로 개발 가능할 것으로 예상되며 이를 위해 향후 보다 정밀한 자연사멸의 분자생물학적 기전 규명이 수반되어야 할 것으로 사료된다.

• Molecules and Cells
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• 제43권5호
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• pp.469-478
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• 2020

Hepatitis C virus (HCV) propagation is highly dependent on cellular proteins. To identify the host factors involved in HCV propagation, we previously performed protein microarray assays and identified the LIM and SH3 domain protein 1 (LASP-1) as an HCV NS5A-interacting partner. LASP-1 plays an important role in the regulation of cell proliferation, migration, and protein-protein interactions. Alteration of LASP-1 expression has been implicated in hepatocellular carcinoma. However, the functional involvement of LASP-1 in HCV propagation and HCV-induced pathogenesis has not been elucidated. Here, we first verified the protein interaction of NS5A and LASP-1 by both in vitro pulldown and coimmunoprecipitation assays. We further showed that NS5A and LASP-1 were colocalized in the cytoplasm of HCV infected cells. NS5A interacted with LASP-1 through the proline motif in domain I of NS5A and the tryptophan residue in the SH3 domain of LASP-1. Knockdown of LASP1 increased HCV replication in both HCV-infected cells and HCV subgenomic replicon cells. LASP-1 negatively regulated viral propagation and thereby overexpression of LASP-1 decreased HCV replication. Moreover, HCV propagation was decreased by wild-type LASP-1 but not by an NS5A binding-defective mutant of LASP-1. We further demonstrated that LASP-1 was involved in the replication stage of the HCV life cycle. Importantly, LASP-1 expression levels were increased in persistently infected cells with HCV. These data suggest that HCV modulates LASP-1 via NS5A in order to regulate virion levels and maintain a persistent infection.

• 생물정신의학
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• 제2권1호
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• pp.100-106
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• 1995

직접적인 근거를 제시하기는 힘드나 정신장애에서 자가면역적 요소가 병인적으로 중요하다는 단편적인 보고들이 있다. 특히 바이러스 감염은 정신장애를 유발하거나 나중에 정신장애에 대한 소지를 증가시킬 가능성이 높다. 저자들은 최근에 많은 관심을 끌고 있는 C형 간염 항체(이하 anti-HCV)의 양성율이 자가면역적 관점 및 수혈 외에도 성행위 또는 약물의 존자에서 많다는 전파경로상의 특정 때문에 정신과 환자에서 일반 인구군보다 높을 것으로 추정되어 이를 확인해 보고자 본 연구를 시행하였다. 1992년 12월 초부터 1994년 5월 말까지 정신과에 입원한 환자 중에서 무작위로 효소면역측정법 (Abbott HCV EIA kit) 에 의해서 혈청내 anti-HCV를 검사하였으며, anti-HCV 양성 환자와 anti-HCV 음성인 환자를 구분하여 여러 변인별로 비교 분석하였다. 정신과 입원환자 113명중 12명(10.6%) 에서 anti-HCV 양성이었다. anti-HCV 양성자중 간기능검사상 이상이 있는 경우가 50.0% 로서 이중 83.0%는 주정 의존자였으며, 간기능검사상 정상인 환자의 83.3%는 비주정의존자였다. 정신과 진단별 anti-HCV 양성율은 주정의존 환자의 22.2%, 정신증 환자의 2.3% (주로 양극성장애), 신경증(불안장애, 적응장애)환자의 22.2%에서 anti-HCV 양성이 나타났다. 연령, 출생계절, 임파구(%), 간기능 등 변인에 대한 유의한 상관성은 관찰되지 않았다. 결론적으로 정신과 입원환자는 정상 대조군 (3.0%)에 비해 최소한 3.5배 이상 anti-HCV 양성율이 높으므로 (P<0.05), 이에 대한 주의를 환기시킬 필요가 있다.