Displaying publications 1 - 20 of 70 in total

Abstract:
Sort:
  1. Xanthorrhizol exhibits antiproliferative activity on MCF-7 breast cancer cells via apoptosis induction
    Cheah YH, Azimahtol HL, Abdullah NR
    Anticancer Res, 2006 Nov-Dec;26(6B):4527-34.
    PMID: 17201174
    Xanthorrhizol is a natural sesquiterpenoid compound isolated from the rhizome of Curcuma xanthorrhiza Roxb (Zingiberaceae). Xanthorrhizol was tested for a variety of important pharmacological activities including antioxidant and anti-inflammatory activities. An antiproliferation assay using the MTT method indicated that xanthorrhizol inhibited the proliferation of the human breast cancer cell line, MCF-7, with an EC50 value of 1.71 microg/ml. Three parameters including annexin-V binding assay, Hoechst 33258 staining and accumulation of sub-G1 population in DNA histogram confirmed the apoptosis induction in response to xanthorrhizol treatment. Western-blotting revealed down-regulation of the anti-apoptotic bcl-2 protein expression. However, xanthorrhizol did not affect the expression of the pro-apoptotic protein, bax, at a concentration of 1 microg/ml, 2.5 microg/ml and 5 microg/ml. The level of p53 was greatly increased, whilst PARP-1 was cleaved to 85 kDa subunits, following the treatment with xanthorrhizol at a dose-dependent manner. These results, thereby, suggest that xanthorrhizol has antiproliferative effects on MCF-7 cells by inducing apoptosis through the modulation of bcl-2, p53 and PARP-1 protein levels.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  2. Identification of genes involved in the regulation of 14-deoxy-11,12-didehydroandrographolide-induced toxicity in T-47D mammary cells
    Tan ML, Tan HK, Oon CE, Kuroyanagi M, Muhammad TS
    Food Chem Toxicol, 2012 Feb;50(2):431-44.
    PMID: 22101062 DOI: 10.1016/j.fct.2011.11.001
    14-Deoxy-11,12-didehydroandrographolide is one of the principle compounds of the medicinal plant, Andrographis paniculata Nees. This study explored the mechanisms of 14-deoxy-11,12-didehydroandrographolide-induced toxicity and non-apoptotic cell death in T-47D breast carcinoma cells. Gene expression analysis revealed that 14-deoxy-11,12-didehydroandrographolide exerted its cytotoxic effects by regulating genes that inhibit the cell cycle or promote cell cycle arrest. This compound regulated genes that are known to reduce/inhibit cell proliferation, induce growth arrest and suppress cell growth. The growth suppression activities of this compound were demonstrated by a downregulation of several genes normally found to be over-expressed in cancers. Microscopic analysis revealed positive monodansylcadaverine (MDC) staining at 8h, indicating possible autophagosomes. TEM analysis revealed that the treated cells were highly vacuolated, thereby suggesting that 14-deoxy-11,12-didehydroandrographolide may cause autophagic morphology in these cells. This morphology may be correlated with the concurrent expression of genes known to affect lysosomal activity, ion transport, protein degradation and vesicle transport. Interestingly, some apoptotic-like bodies were found, and these bodies contained multiple large vacuoles, suggesting that this compound is capable of eliciting a combination of apoptotic and autophagic-like morphological characteristics.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  3. Microarray-based identification of differentially expressed genes associated with andrographolide derivatives-induced resistance in colon and prostate cancer cell lines
    Quah SY, Wong CC, Wong HC, Ho KL, Abdul Manan N, Deb PK, et al.
    Toxicol Appl Pharmacol, 2021 08 15;425:115605.
    PMID: 34087331 DOI: 10.1016/j.taap.2021.115605
    Chemoresistance poses a major hurdle to cancer treatments. Andrographolide-derived SRJ09 and SRJ23 were reported to exhibit potent, selective inhibitory activities against colon and prostate cancer cells, respectively. In this study, previously developed resistant colon (HCT-116rst09) and prostate (PC-3rst23) cancer cell lines were used to elucidate the molecular mechanisms contributing to chemoresistance. Cytotoxic effects of SRJ09 and SRJ23 on both parental and resistant cells were investigated. Cell cycle distributions in HCT-116rst09 cells following SRJ09 treatment were analysed using flow cytometry. Whole-genome microarray analysis was performed on both parental and resistant cells to obtain differential gene expression profiles. Microarray data were subjected to protein-protein interaction network, functional enrichment, and pathway analyses. Reverse transcription-polymerase chain reaction (RT-PCR) was used to validate the changes in expression levels of selected genes. Besides morphological changes, HCT-116rst09 cells showed 7.0-fold resistance to SRJ09 while PC-3rst23 cells displayed a 5.5-fold resistance to SRJ23, as compared with their respective parental cells. G0/G1-phase cell cycle arrest was observed in HCT-116rst09 cells upon SRJ09 treatment. Collectively, 77 and 21 genes were found differentially modulated in HCT-116rst09 and PC-3rst23 cells, respectively. Subsequent bioinformatics analysis revealed several genes associated with FGFR4 and PI3K pathways, and cancer stemness, were chemoresistance mediators in HCT-116rst09 cells. RT-PCR confirmed the HMOX1 upregulation and ATG12 downregulation protected the PC-3rst23 cells from SRJ23 cytotoxicity. In conclusion, acquired chemoresistance to SRJ09 and SRJ23 in colon and prostate cancer cells, respectively, could be attributed to the alterations in the expression of genes such as those related to PI3K and autophagy pathways.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  4. RNA Sequencing and Bioinformatics Analysis Reveals the Downregulation of DNA Replication Genes by Morindone in Colorectal Cancer Cells
    Chee CW, Mohd Hashim N, Abdullah I, Nor Rashid N
    Appl Biochem Biotechnol, 2024 Jun;196(6):3216-3233.
    PMID: 37642925 DOI: 10.1007/s12010-023-04690-9
    Morindone, a natural anthraquinone compound, has been reported to have significant pharmacological properties in different cancers. However, its anticancer effects in colorectal cancer (CRC) and the underlying molecular mechanisms remain obscure. In this study, RNA sequencing was used to assess the differentially expressed genes (DEGs) following morindone treatment in two CRC cell lines, HCT116 and HT29 cells. Functional enrichment analysis of overlapping DEGs revealed that negative regulation of cell development from biological processes and the MAPK signalling pathway were the most significant Gene Ontology terms and Kyoto Encyclopaedia of Genes and Genome pathway, respectively. Seven hub genes were identified among the overlapping genes, including MCM5, MCM6, MCM10, GINS2, POLE2, PRIM1, and WDHD1. All hub genes were found downregulated and involved in DNA replication fork. Among these, GINS2 was identified as the most cancer-dependent gene in both cells with better survival outcomes. Validation was performed on seven hub genes with rt-qPCR, and the results were consistent with the RNA sequencing findings. Collectively, this study provides corroboration of the potential therapeutic benefits and suitable pharmacological targets of morindone in the treatment of CRC.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  5. Tocotrienol-rich fraction from palm oil and gene expression in human breast cancer cells
    Nesaretnam K, Ambra R, Selvaduray KR, Radhakrishnan A, Canali R, Virgili F
    Ann N Y Acad Sci, 2004 Dec;1031:143-57.
    PMID: 15753141
    Vitamin E is important not only for its cellular antioxidant and lipid-lowering properties, but also as an antiproliferating agent. It has also been shown to contribute to immunoregulation, antibody production, and resistance to implanted tumors. It has recently been shown that tocotrienols are the components of vitamin E responsible for growth inhibition in human breast cancer cells in vitro as well as in vivo through estrogen-independent mechanisms. Although tocotrienols act on cell proliferation in a dose-dependent manner and can induce programmed cell death, no specific gene regulation has yet been identified. In order to investigate the molecular basis of the effect of a tocotrienol-rich fraction (TRF) from palm oil, we performed a cDNA array analysis of cancer-related gene expression in estrogen-dependent (MCF-7) and estrogen-independent (MDA-MB-231) human breast cancer cells. The human breast cancer cells were incubated with or without 8 mug/mL of tocotrienols for 72 h. RNA was subsequently extracted and subjected to reverse transcription before being hybridized onto cancer arrays. Tocotrienol supplementation modulated significantly 46 out of 1200 genes in MDA-MB-231 cells. In MCF-7 cells, tocotrienol administration was associated with a lower number of affected genes. Interestingly, only three were affected in a similar fashion in both cell lines: c-myc binding protein MM-1, 23-kDa highly basic protein, and interferon-inducible protein 9-27 (IFITM-1). These proteins are most likely involved in the cell cycle and can exert inhibitory effects on cell growth and differentiation of the tumor cell lines. These data suggest that tocotrienols are able to affect cell homeostasis, possibly independent of their antioxidant activity.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  6. Anti-Cancer Natural Products Inducing Cross-talk between Apoptosis and Autophagy Mutual Proteins to Regulate Cancer Cell Death: Design of Future Green Anticancer Therapies
    Vijayarathna S, Jothy SL, Chen Y, Kanwar JR, Sasidharan S
    Asian Pac J Cancer Prev, 2015;16(14):6175-6.
    PMID: 26320517
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  7. Validation of immunogenic PASD1 peptides against HLA-A*24:02 colorectal cancer
    Soh JE, Abu N, Sagap I, Mazlan L, Yahaya A, Mustangin M, et al.
    Immunotherapy, 2019 10;11(14):1205-1219.
    PMID: 31478431 DOI: 10.2217/imt-2019-0073
    Colorectal cancer is the third commonest malignancy in Asia including Malaysia. The immunogenic cancer-testis antigens, which are expressed in a variety of cancers but with limited expression in normal tissues except the testis, represent an attractive approach to improve treatment options for colorectal cancer. We aimed to validate four PASD1 peptides as the immunotherapeutic targets in colorectal cancer. First, PASD1 mRNA and protein expression were determined via real-time polymerase chain reaction (RT-PCR) and immunohistochemistry. The PASD1 peptides specific to HLA-A*24:02 were investigated using IFN-y-ELISpot assay, followed by the cytolytic and granzyme-B-ELISpot assays to analyze the cytolytic effects of CD8+ T cells. Gene and protein expressions of PASD1 were detected in 20% and 17.3% of colorectal cancer samples, respectively. PASD1(4) peptide was shown to be immunogenic in colorectal cancer samples. CD8+ T cells raised against PASD1(4) peptide were able to lyze HLA-A*24:02+ PASD1+ cells. Our results reveal that PASD1(4) peptide represents a potential target for colorectal cancer.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  8. Fulltext Clinically Relevant Genes and Proteins Modulated by Tocotrienols in Human Colon Cancer Cell Lines: Systematic Scoping Review
    Khalid AQ, Bhuvanendran S, Magalingam KB, Ramdas P, Kumari M, Radhakrishnan AK
    Nutrients, 2021 Nov 12;13(11).
    PMID: 34836311 DOI: 10.3390/nu13114056
    The last decade has witnessed tremendous growth in tocotrienols (T3s) research, especially in the field of oncology, owing to potent anticancer property. Among the many types of cancers, colorectal cancer (CRC) is growing to become a serious global health threat to humans. Chemoprevention strategies in recent days are open to exploring alternative interventions to inhibit or delay carcinogenesis, especially with the use of bioactive natural compounds, such as tocotrienols. This scoping review aims to distil the large bodies of literature from various databases to identify the genes and their encoded modulations by tocotrienols and to explicate important mechanisms via which T3s combat CRC. For this scoping review, research papers published from 2010 to early 2021 related to T3s and human CRC cells were reviewed in compliance with the PRISMA guidelines. The study included research articles published in English, searchable on four literature databases (Ovid MEDLINE, PubMed, Scopus, and Embase) that reported differential expression of genes and proteins in human CRC cell lines following exposure to T3s. A total of 12 articles that fulfilled the inclusion and exclusion criteria of the study were short-listed for data extraction and analysis. The results from the analysis of these 12 articles showed that T3s, especially its γ and δ analogues, modulated the expression of 16 genes and their encoded proteins that are associated with several important CRC pathways (apoptosis, transcriptional dysregulation in cancer, and cancer progression). Further studies and validation work are required to scrutinize the specific role of T3s on these genes and proteins and to propose the use of T3s to develop adjuvant or multi-targeted therapy for CRC.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  9. Fulltext Mechanism of Apoptosis Induced by Curcumin in Colorectal Cancer
    Ismail NI, Othman I, Abas F, H Lajis N, Naidu R
    Int J Mol Sci, 2019 May 17;20(10).
    PMID: 31108984 DOI: 10.3390/ijms20102454
    Colorectal cancer (CRC) is among the top three cancer with higher incident and mortality rate worldwide. It is estimated that about over than 1.1 million of death and 2.2 million new cases by the year 2030. The current treatment modalities with the usage of chemo drugs such as FOLFOX and FOLFIRI, surgery and radiotherapy, which are usually accompanied with major side effects, are rarely cured along with poor survival rate and at higher recurrence outcome. This trigger the needs of exploring new natural compounds with anti-cancer properties which possess fewer side effects. Curcumin, a common spice used in ancient medicine was found to induce apoptosis by targeting various molecules and signaling pathways involved in CRC. Disruption of the homeostatic balance between cell proliferation and apoptosis could be one of the promoting factors in colorectal cancer progression. In this review, we describe the current knowledge of apoptosis regulation by curcumin in CRC with regard to molecular targets and associated signaling pathways.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  10. Fulltext Oxidative stress-mediated apoptosis induced by ethanolic mango seed extract in cultured estrogen receptor positive breast cancer MCF-7 cells
    Abdullah AS, Mohammed AS, Rasedee A, Mirghani ME
    Int J Mol Sci, 2015;16(2):3528-36.
    PMID: 25664859 DOI: 10.3390/ijms16023528
    Breast cancer has become a global health issue requiring huge expenditures for care and treatment of patients. There is a need to discover newer cost-effective alternatives for current therapeutic regimes. Mango kernel is a waste product with potential as a source of anti-cancer phytochemicals, especially since it is non-toxic towards normal breast cell lines at concentrations for which it induces cell death in breast cancer cells. In this study, the anti-cancer effect of mango kernel extract was determined on estrogen receptor-positive human breast carcinoma (MCF-7) cells. The MCF-7 cells were cultured and treated with 5, 10 and 50 μg/mL of mango kernel extract for 12 and 24 h. In response to treatment, there were time- and dose-dependent increases in oxidative stress markers and pro-apoptotic factors; Bcl-2-like protein 4 (BAX), p53, cytochrome c and caspases (7, 8 and 9) in the MCF-7 cells treated with the extract. At the same time, there were decreases in pro-survival markers (Bcl-2 and glutathione) as the result of the treatments. The changes induced in the MCF-7 cells by mango kernel extract treatment suggest that the extract can induce cancer cell apoptosis, likely via the activation of oxidative stress. These findings need to be evaluated further to determine whether mango kernel extract can be developed as an anti-breast cancer agent.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  11. Fulltext Regulation of microRNAs by natural agents: new strategies in cancer therapies
    Phuah NH, Nagoor NH
    Biomed Res Int, 2014;2014:804510.
    PMID: 25254214 DOI: 10.1155/2014/804510
    MicroRNAs (miRNAs) are short noncoding RNA which regulate gene expression by messenger RNA (mRNA) degradation or translation repression. The plethora of published reports in recent years demonstrated that they play fundamental roles in many biological processes, such as carcinogenesis, angiogenesis, programmed cell death, cell proliferation, invasion, migration, and differentiation by acting as tumour suppressor or oncogene, and aberrations in their expressions have been linked to onset and progression of various cancers. Furthermore, each miRNA is capable of regulating the expression of many genes, allowing them to simultaneously regulate multiple cellular signalling pathways. Hence, miRNAs have the potential to be used as biomarkers for cancer diagnosis and prognosis as well as therapeutic targets. Recent studies have shown that natural agents such as curcumin, resveratrol, genistein, epigallocatechin-3-gallate, indole-3-carbinol, and 3,3'-diindolylmethane exert their antiproliferative and/or proapoptotic effects through the regulation of one or more miRNAs. Therefore, this review will look at the regulation of miRNAs by natural agents as a means to potentially enhance the efficacy of conventional chemotherapy through combinatorial therapies. It is hoped that this would provide new strategies in cancer therapies to improve overall response and survival outcome in cancer patients.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  12. In vitro and in vivo anti-colon cancer effects of Garcinia mangostana xanthones extract
    Aisha AF, Abu-Salah KM, Ismail Z, Majid AM
    BMC Complement Altern Med, 2012;12:104.
    PMID: 22818000
    BACKGROUND: Xanthones are a group of oxygen-containing heterocyclic compounds with remarkable pharmacological effects such as anti-cancer, antioxidant, anti-inflammatory, and antimicrobial activities.
    METHODS: A xanthones extract (81% α-mangostin and 16% γ-mangostin), was prepared by crystallization of a toluene extract of G. mangostana fruit rinds and was analyzed by LC-MS. Anti-colon cancer effect was investigated on HCT 116 human colorectal carcinoma cells including cytotoxicity, apoptosis, anti-tumorigenicity, and effect on cell signalling pathways. The in vivo anti-colon cancer activity was also investigated on subcutaneous tumors established in nude mice.
    RESULTS: The extract showed potent cytotoxicity (median inhibitory concentration 6.5 ± 1.0 μg/ml), due to induction of the mitochondrial pathway of apoptosis. Three key steps in tumor metastasis including the cell migration, cell invasion and clonogenicity, were also inhibited. The extract and α-mangostin up-regulate the MAPK/ERK, c-Myc/Max, and p53 cell signalling pathways. The xanthones extract, when fed to nude mice, caused significant growth inhibition of the subcutaneous tumor of HCT 116 colorectal carcinoma cells.
    CONCLUSIONS: Our data suggest new mechanisms of action of α-mangostin and the G. mangostana xanthones, and suggest the xanthones extract of as a potential anti-colon cancer candidate.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  13. Fulltext Alterations of microRNA expression patterns in human cervical carcinoma cells (Ca Ski) toward 1'S-1'-acetoxychavicol acetate and cisplatin
    Phuah NH, In LL, Azmi MN, Ibrahim H, Awang K, Nagoor NH
    Reprod Sci, 2013 May;20(5):567-78.
    PMID: 23012319 DOI: 10.1177/1933719112459220
    The aims of this study were to investigate the combined effects of a natural compound 1'S-1'-acetoxychavicol acetate (ACA) with cisplatin (CDDP) on HPV-positive human cervical carcinoma cell lines (Ca Ski-low cisplatin sensitivity and HeLa-high cisplatin sensitivity), and to identify microRNAs (miRNAs) modulated in response toward ACA and/or CDDP. It was revealed that both ACA and CDDP induced dose- and time-dependent cytotoxicity when used as a stand-alone agent, while synergistic effects were observed when used in combination with a combination index (CI) value of 0.74 ± 0.01 and 0.85 ± 0.01 in Ca Ski and HeLa cells, respectively. A total of 25 miRNAs were found to be significantly differentially expressed in response to ACA and/or CDDP. These include hsa-miR-138, hsa-miR-210, and hsa-miR-744 with predicted gene targets involved in signaling pathways regulating apoptosis and cell cycle progression. In conclusion, ACA acts as a chemosensitizer which synergistically potentiates the cytotoxic effect of CDDP in cervical cancer cells. The altered miRNA expression upon administration of ACA and/or CDDP suggests that miRNAs play an important role in anticancer drug responses, which can be manipulated for therapeutic purposes.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  14. Fulltext Tamarindus indica extract alters release of alpha enolase, apolipoprotein A-I, transthyretin and Rab GDP dissociation inhibitor beta from HepG2 cells
    Chong UR, Abdul-Rahman PS, Abdul-Aziz A, Hashim OH, Junit SM
    PLoS One, 2012;7(6):e39476.
    PMID: 22724021 DOI: 10.1371/journal.pone.0039476
    The plasma cholesterol and triacylglycerol lowering effects of Tamarindus indica extract have been previously described. We have also shown that the methanol extract of T. indica fruit pulp altered the expression of lipid-associated genes including ABCG5 and APOAI in HepG2 cells. In the present study, effects of the same extract on the release of proteins from the cells were investigated using the proteomics approach.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  15. Tocotrienol-treated MCF-7 human breast cancer cells show down-regulation of API5 and up-regulation of MIG6 genes
    Ramdas P, Rajihuzzaman M, Veerasenan SD, Selvaduray KR, Nesaretnam K, Radhakrishnan AK
    Cancer Genomics Proteomics, 2011 Jan-Feb;8(1):19-31.
    PMID: 21289334
    Tocotrienols belong to the vitamin E family and have multiple anticancer effects, such as antiproliferative, antioxidant, pro-apoptosis and antimetastatic. This study aimed to identify the genes that are regulated in human breast cancer cells following exposure to various isomers of vitamin E as these may be potential targets for the treatment of breast cancer.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  16. Modulation of cell growth and PPARgamma expression in human colorectal cancer cell lines by ciglitazone
    Yaacob NS, Darus HM, Norazmi MN
    Exp. Toxicol. Pathol., 2008 Sep;60(6):505-12.
    PMID: 18579355 DOI: 10.1016/j.etp.2008.05.006
    Studies have shown that ligand activation of peroxisome proliferator-activated receptor gamma (PPARgamma) can induce differentiation and inhibit proliferation of several cancer cells. The present study was performed to investigate the effects of the PPARgamma ligand, ciglitazone, and the involvement of PPARgamma in modulating the growth of human colorectal cancer cells. Lactate dehydrogenase release assay showed that ciglitazone potently inhibited HT-29 (well-differentiated) and COLO-205 (poorly differentiated) colorectal adenocarcinoma cell growth. Measurement of apoptosis by flow cytometry using a fluorescein-conjugated monoclonal antibody against cytokeratin 18 revealed a high induction of apoptosis by ciglitazone in a time-dependent fashion. The expression of PPARgamma1 but not PPARgamma2 mRNA was significantly downregulated as measured by real-time quantitative PCR, and the PPARgamma protein levels were decreased as determined by Western blot analysis. We conclude that ciglitazone treatment suppressed colon cancer cell growth via induction of apoptosis. However, the anticancer effects of ciglitazone may not depend solely on PPARgamma activation.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  17. Tocotrienol-rich fraction from palm oil affects gene expression in tumors resulting from MCF-7 cell inoculation in athymic mice
    Nesaretnam K, Ambra R, Selvaduray KR, Radhakrishnan A, Reimann K, Razak G, et al.
    Lipids, 2004 May;39(5):459-67.
    PMID: 15506241
    It has recently been shown that tocotrienols are the components of vitamin E responsible for inhibiting the growth of human breast cancer cells in vitro, through an estrogen-independent mechanism. Although tocotrienols act on cell proliferation in a dose-dependent manner and can induce programmed cell death, no specific gene regulation has yet been identified. To investigate the molecular basis of the effect of tocotrienols, we injected MCF-7 breast cancer cells into athymic nude mice. Mice were fed orally with 1 mg/d of tocotrienol-rich fraction (TRF) for 20 wk. At end of the 20 wk, there was a significant delay in the onset, incidence, and size of the tumors in nude mice supplemented with TRF compared with the controls. At autopsy, the tumor tissue was excised and analyzed for gene expression by means of a cDNA array technique. Thirty out of 1176 genes were significantly affected. Ten genes were downregulated and 20 genes up-regulated with respect to untreated animals, and some genes in particular were involved in regulating the immune system and its function. The expression of the interferon-inducible transmembrane protein-1 gene was significantly up-regulated in tumors excised from TRF-treated animals compared with control mice. Within the group of genes related to the immune system, we also found that the CD59 glycoprotein precursor gene was up-regulated. Among the functional class of intracellular transducers/effectors/modulators, the c-myc gene was significantly down-regulated in tumors by TRF treatment. Our observations indicate that TRF supplementation significantly and specifically affects MCF-7 cell response after tumor formation in vivo and therefore the host immune function. The observed effect on gene expression is possibly exerted independently from the antioxidant activity typical of this family of molecules.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  18. Fulltext Effect of cathepsin D and prostate specific antigen on latent transforming growth factor-beta in breast cancer cell lines
    Wong SF, Seow HF, Lai LC
    Malays J Pathol, 2003 Dec;25(2):129-34.
    PMID: 16196369
    Transforming growth factor-beta (TGFbeta) is present, predominantly in latent forms, in normal and malignant breast tissue. The mechanisms by which latent TGFbeta is activated physiologically remain largely an enigma. The objective of this study was to assess whether the proteases, cathepsin D and prostate specific antigen (PSA) could activate latent TGFbeta1 and TGFbeta2 in conditioned media of the hormone-dependent MCF-7 and hormone-independent MDA-MB-231 human breast cancer cell lines, newly purchased from ATCC. Both of the cell lines were seeded in 6-well plates 2 days prior to treatment with varying concentrations of cathepsin D and PSA. Active TGFbeta1 and TGFbeta2 in the media were then measured by ELISA after 4, 8, 24 and 72 hours of treatment. TGFbeta1 and TGFbeta2 mRNA expression of both cell lines were measured by RT-PCR to determine whether any increase in level of active TGFbeta1 and TGFbeta2 was due to increased production. There was a significant increase in only active TGFbeta2 levels in the MDA-MB-231 cell line with both treatments. Cathepsin D and PSA did not have any effect on TGFbeta1 and TGFbeta2 mRNA expression. Cathepsin D and PSA were unable to activate latent TGFbeta1 and TGFbeta2 in these two breast cancer cell lines. A constant level of TGFbeta2 mRNA in the control and treated MDA-MB-231 cells suggests that the increase in level of active TGFbeta2 was not a result of increased production but was likely to be due to activation by a mechanism independent of cathepsin D and PSA.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
  19. Strobilanthes crispus Juice Concentrations and Anticancer Effects on DNA Damage, Apoptosis and Gene Expression in Hepatocellular Carcinoma Cells
    Hussin F, Eshkoor SA, Rahmat A, Othman F, Akim A, Eshak Z
    Asian Pac J Cancer Prev, 2015;16(14):6047-53.
    PMID: 26320494
    BACKGROUND: Hepatocellular carcinoma is one of the most common cancers worldwide. Its prevalence is increasing in many countries. Plant products can be used to protect against cancer due to natural anticancer and chemopreventive constituents. Strobilanthes crispus is one of plants with potential chemopreventive ability.

    OBJECTIVE: This study aimed to evaluate the anticancer effects of Strobilanthes crispus juice on hepatocellular carcinoma cells.

    MATERIALS AND METHODS: MTT assays, flow cytometry, comet assays and the reverse transcription- polymerase chain reaction (RT-PCR) were used to determine the effects of juice on DNA damage and cancer cell numbers.

    RESULTS: This juice induced apoptosis after exposure of the HepG2 cell line for 72 h. High percentages of apoptotic cell death and DNA damage were seen at the juice concentrations above 0.1%. It was found that the juice was not toxic for normal cells. In addition, juice exposure increased the expression level of c-myc gene and reduced the expression level of c-fos and c-erbB2 genes in HepG2 cells. The cytotoxic effects of juice on abnormal cells were in dose dependent.

    CONCLUSIONS: It was concluded that the Strobilanthes crispus juice may have chemopreventive effects on hepatocellular carcinoma cells.

    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects*
  20. Cancer prevention and therapy through the modulation of transcription factors by bioactive natural compounds
    Shanmugam MK, Lee JH, Chai EZ, Kanchi MM, Kar S, Arfuso F, et al.
    Semin Cancer Biol, 2016 10;40-41:35-47.
    PMID: 27038646 DOI: 10.1016/j.semcancer.2016.03.005
    The association between chronic inflammation and cancer development has been well documented. One of the major obstacles in cancer treatment is the persistent autocrine and paracrine activation of pro-inflammatory transcription factors such as nuclear factor-κB, signal transducer and activator of transcription 3, activator protein 1, fork head box protein M1, and hypoxia-inducible factor 1α in a wide variety of tumor cell lines and patient specimens. This, in turn, leads to an accelerated production of cellular adhesion molecules, inflammatory cytokines, chemokines, anti-apoptotic molecules, and inducible nitric oxide synthase. Numerous medicinal plant-derived compounds have made a tremendous impact in drug discovery research endeavors, and have been reported to modulate the activation of diverse oncogenic transcription factors in various tumor models. Moreover, novel therapeutic combinations of standard chemotherapeutic drugs with these agents have significantly improved patient survival by making cancer cells more susceptible to chemotherapy and radiotherapy. In this review, we critically analyze the existing literature on the modulation of diverse transcription factors by various natural compounds and provide views on new directions for accelerating the discovery of novel drug candidates derived from Mother Nature.
    Matched MeSH terms: Gene Expression Regulation, Neoplastic/drug effects
Related Terms
Filters
Contact Us

Please provide feedback to Administrator ([email protected])

External Links