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Shawky AM, Almalki FA, Abdalla AN, Youssif BGM, Abdel-Fattah MM, Hersi F, El-Sherief HAM, Ibrahim NA, Gouda AM. Discovery and optimization of 2,3-diaryl-1,3-thiazolidin-4-one-based derivatives as potent and selective cytotoxic agents with anti-inflammatory activity. Eur J Med Chem 2023; 259:115712. [PMID: 37567059 DOI: 10.1016/j.ejmech.2023.115712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 08/02/2023] [Accepted: 08/04/2023] [Indexed: 08/13/2023]
Abstract
Several studies have indicated the potential therapeutic outcomes of combining selective COX-2 inhibitors with tubulin-targeting anticancer agents. In the current study, a novel series of thiazolidin-4-one-based derivatives (7a-q) was designed by merging the pharmacophoric features of some COXs inhibitors and tubulin polymerization inhibitors. Compounds 7a-q were synthesized and evaluated for their cytotoxic activity against MCF7, HT29, and A2780 cancer cell lines (IC50 = 0.02-17.02 μM). The cytotoxicity of 7a-q was also assessed against normal MRC5 cells (IC50 = 0.47-13.46 μM). Compounds 7c, 7i, and 7j, the most active in the MTT assay, significantly reduced the number of HT29 colonies compared to the control. Compounds 7c, 7i, and 7j also induced significant decreases in the tumor volumes and masses in Ehrlich solid carcinoma-bearing mice compared to the control. The three compounds also exhibited significant anti-HT29 migration activity in the wound-healing assay. They have also induced cell cycle arrest in HT29 cells at the S and G2/M phases. In addition, they induced significant increases in both early and late apoptotic events in HT29 cells compared to the control, where 7j showed the highest effect. On the other hand, compound 7j (1 μM) displayed weak inhibitory activity against tubulin polymerization compared to colchicine (3 μM). On the other hand, compounds 7a-q inhibited the activity of COX-2 (IC50 = 0.42-29.11 μM) compared to celecoxib (IC50 = 0.86 μM). In addition, 7c, 7i, and 7j showed moderate inhibition of inflammation in rats compared to indomethacin, with better GIT safety profiles. Molecular docking analysis revealed that 7c, 7i, and 7j have higher binding free energies towards COX-2 than COX-1. These above results suggested that 7j could serve as a potential anticancer drug candidate.
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Affiliation(s)
- Ahmed M Shawky
- Science and Technology Unit (STU), Umm Al-Qura University, Makkah, 21955, Saudi Arabia
| | - Faisal A Almalki
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Makkah, 21955, Saudi Arabia
| | - Ashraf N Abdalla
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Umm Al-Qura University, Makkah, 21955, Saudi Arabia; Department of Pharmacology and Toxicology, Medicinal and Aromatic Plants Research Institute, National Center for Research, Khartoum, 2404, Sudan
| | - Bahaa G M Youssif
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Assiut University, Assiut, 71526, Egypt
| | - Maha M Abdel-Fattah
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, 62514, Egypt
| | - Fatima Hersi
- Research Institute for Medical and Health Sciences, University of Sharjah, Sharjah, 27272, United Arab Emirates
| | - Hany A M El-Sherief
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Deraya University, Minia, Egypt
| | - Nashwa A Ibrahim
- Medicinal Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, 62514, Egypt
| | - Ahmed M Gouda
- Medicinal Chemistry Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, 62514, Egypt.
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Sankaranarayanan R, Kumar DR, Altinoz MA, Bhat GJ. Mechanisms of Colorectal Cancer Prevention by Aspirin-A Literature Review and Perspective on the Role of COX-Dependent and -Independent Pathways. Int J Mol Sci 2020; 21:ijms21239018. [PMID: 33260951 PMCID: PMC7729916 DOI: 10.3390/ijms21239018] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 11/25/2020] [Accepted: 11/26/2020] [Indexed: 12/11/2022] Open
Abstract
Aspirin, synthesized and marketed in 1897 by Bayer, is one of the most widely used drugs in the world. It has a well-recognized role in decreasing inflammation, pain and fever, and in the prevention of thrombotic cardiovascular diseases. Its anti-inflammatory and cardio-protective actions have been well studied and occur through inhibition of cyclooxygenases (COX). Interestingly, a vast amount of epidemiological, preclinical and clinical studies have revealed aspirin as a promising chemopreventive agent, particularly against colorectal cancers (CRC); however, the primary mechanism by which it decreases the occurrences of CRC has still not been established. Numerous mechanisms have been proposed for aspirin’s chemopreventive properties among which the inhibition of COX enzymes has been widely discussed. Despite the wide attention COX-inhibition has received as the most probable mechanism of cancer prevention by aspirin, it is clear that aspirin targets many other proteins and pathways, suggesting that these extra-COX targets may also be equally important in preventing CRC. In this review, we discuss the COX-dependent and -independent pathways described in literature for aspirin’s anti-cancer effects and highlight the strengths and limitations of the proposed mechanisms. Additionally, we emphasize the potential role of the metabolites of aspirin and salicylic acid (generated in the gut through microbial biotransformation) in contributing to aspirin’s chemopreventive actions. We suggest that the preferential chemopreventive effect of aspirin against CRC may be related to direct exposure of aspirin/salicylic acid or its metabolites to the colorectal tissues. Future investigations should shed light on the role of aspirin, its metabolites and the role of the gut microbiota in cancer prevention against CRC.
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Affiliation(s)
- Ranjini Sankaranarayanan
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, South Dakota State University, Brookings, SD 57007, USA;
| | - D. Ramesh Kumar
- Department of Entomology, University of Kentucky, Lexington, KY 40506, USA;
| | - Meric A. Altinoz
- Department of Biochemistry, Acibadem M.A.A. University, Istanbul, Turkey;
| | - G. Jayarama Bhat
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, South Dakota State University, Brookings, SD 57007, USA;
- Correspondence: ; Tel.: +1-605-688-6894
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Sankaranarayanan R, Kumar DR, Patel J, Bhat GJ. Do Aspirin and Flavonoids Prevent Cancer through a Common Mechanism Involving Hydroxybenzoic Acids?-The Metabolite Hypothesis. Molecules 2020; 25:molecules25092243. [PMID: 32397626 PMCID: PMC7249170 DOI: 10.3390/molecules25092243] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Revised: 05/02/2020] [Accepted: 05/09/2020] [Indexed: 12/12/2022] Open
Abstract
Despite decades of research to elucidate the cancer preventive mechanisms of aspirin and flavonoids, a consensus has not been reached on their specific modes of action. This inability to accurately pinpoint the mechanism involved is due to the failure to differentiate the primary targets from its associated downstream responses. This review is written in the context of the recent findings on the potential pathways involved in the prevention of colorectal cancers (CRC) by aspirin and flavonoids. Recent reports have demonstrated that the aspirin metabolites 2,3-dihydroxybenzoic acid (2,3-DHBA), 2,5-dihydroxybenzoic acid (2,5-DHBA) and the flavonoid metabolites 2,4,6-trihydroxybenzoic acid (2,4,6-THBA), 3,4-dihydroxybenzoic acid (3,4-DHBA) and 3,4,5-trihydroxybenzoic acid (3,4,5-THBA) were effective in inhibiting cancer cell growth in vitro. Limited in vivo studies also provide evidence that some of these hydroxybenzoic acids (HBAs) inhibit tumor growth in animal models. This raises the possibility that a common pathway involving HBAs may be responsible for the observed cancer preventive actions of aspirin and flavonoids. Since substantial amounts of aspirin and flavonoids are left unabsorbed in the intestinal lumen upon oral consumption, they may be subjected to degradation by the host and bacterial enzymes, generating simpler phenolic acids contributing to the prevention of CRC. Interestingly, these HBAs are also abundantly present in fruits and vegetables. Therefore, we suggest that the HBAs produced through microbial degradation of aspirin and flavonoids or those consumed through the diet may be common mediators of CRC prevention.
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Affiliation(s)
- Ranjini Sankaranarayanan
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, South Dakota State University, College of Pharmacy and Allied Health Professions, Brookings, SD 57007, USA; (R.S.); (J.P.)
| | - D. Ramesh Kumar
- Department of Entomology, University of Kentucky, Lexington, KY 40506, USA;
| | - Janki Patel
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, South Dakota State University, College of Pharmacy and Allied Health Professions, Brookings, SD 57007, USA; (R.S.); (J.P.)
| | - G. Jayarama Bhat
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, South Dakota State University, College of Pharmacy and Allied Health Professions, Brookings, SD 57007, USA; (R.S.); (J.P.)
- Correspondence: ; Tel.: +1-605-688-6894
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Sankaranarayanan R, Valiveti CK, Dachineni R, Kumar DR, Lick T, Bhat GJ. Aspirin metabolites 2,3‑DHBA and 2,5‑DHBA inhibit cancer cell growth: Implications in colorectal cancer prevention. Mol Med Rep 2019; 21:20-34. [PMID: 31746356 PMCID: PMC6896348 DOI: 10.3892/mmr.2019.10822] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 10/08/2019] [Indexed: 12/21/2022] Open
Abstract
Although compelling evidence exists on the ability of aspirin to treat colorectal cancer (CRC), and numerous theories and targets have been proposed, a consensus has not been reached regarding its mechanism of action. In this regard, a relatively unexplored area is the role played by aspirin metabolites 2,3-dihydroxybenzoic acid (2,3-DHBA) and 2,5-dihydroxybenzoic acid (2,5-DHBA) in its chemopreventive actions. In a previous study, we demonstrated that 2,3-DHBA and 2,5-DHBA inhibited CDK1 enzyme activity in vitro. The aim of the present study was to understand the effect of these metabolites on the enzyme activity of all CDKs involved in cell cycle regulation (CDKs 1, 2, 4 and 6) as well as their effect on clonal formation in three different cancer cell lines. Additionally, in silico studies were performed to determine the potential sites of interactions of 2,3-DHBA and 2,5-DHBA with CDKs. We demonstrated that 2,3-DHBA and 2,5-DHBA inhibits CDK-1 enzyme activity beginning at 500 µM, while CDK2 and CDK4 activity was inhibited only at higher concentrations (>750 µM). 2,3-DHBA inhibited CDK6 enzyme activity from 250 µM, while 2,5-DHBA inhibited its activity >750 µM. Colony formation assays showed that 2,5-DHBA was highly effective in inhibiting clonal formation in HCT-116 and HT-29 CRC cell lines (250–500 µM), and in the MDA-MB-231 breast cancer cell line (~100 µM). In contrast 2,3-DHBA was effective only in MDA-MB-231 cells (~500 µM). Both aspirin and salicylic acid failed to inhibit all four CDKs and colony formation. Based on the present results, it is suggested that 2,3-DHBA and 2,5-DHBA may contribute to the chemopreventive properties of aspirin, possibly through the inhibition of CDKs. The present data and the proposed mechanisms should open new areas for future investigations.
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Affiliation(s)
- Ranjini Sankaranarayanan
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, Avera Health and Sciences Center, South Dakota State University, Brookings, SD 57007, USA
| | - Chaitanya K Valiveti
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, Avera Health and Sciences Center, South Dakota State University, Brookings, SD 57007, USA
| | - Rakesh Dachineni
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, Avera Health and Sciences Center, South Dakota State University, Brookings, SD 57007, USA
| | - D Ramesh Kumar
- Department of Entomology, University of Kentucky, Lexington, KY 40546, USA
| | - Tana Lick
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, Avera Health and Sciences Center, South Dakota State University, Brookings, SD 57007, USA
| | - G Jayarama Bhat
- Department of Pharmaceutical Sciences and Translational Cancer Research Center, College of Pharmacy and Allied Health Professions, Avera Health and Sciences Center, South Dakota State University, Brookings, SD 57007, USA
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Ganesh R, Marks DJB, Sales K, Winslet MC, Seifalian AM. Cyclooxygenase/lipoxygenase shunting lowers the anti-cancer effect of cyclooxygenase-2 inhibition in colorectal cancer cells. World J Surg Oncol 2012; 10:200. [PMID: 23013454 PMCID: PMC3527267 DOI: 10.1186/1477-7819-10-200] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2012] [Accepted: 09/10/2012] [Indexed: 12/17/2022] Open
Abstract
BACKGROUND Arachidonic acid metabolite, generated by cyclooxygenase (COX), is implicated in the colorectal cancer (CRC) pathogenesis. Inhibiting COX may therefore have anti-carcinogenic effects. Results from use of non-steroidal anti-inflammatory drugs inhibiting only COX have been conflicting. It has been postulated that this might result from the shunting of arachidonic acid metabolism to the 5-lipoxygenase (5-LOX) pathway. Cancer cell viability is promoted by 5-LOX through several mechanisms that are similar to those of cyclooxygenase-2 (COX-2). Expression of 5-LOX is upregulated in colorectal adenoma and cancer. The aim of this study was to investigate the shunting of arachidonic acid metabolism to the 5-LOX pathway by cyclooxygenase inhibition and to determine if this process antagonizes the anti-cancer effect in colorectal cancer cells. METHODS Three colorectal cancer cell lines (HCA7, HT-29 & LoVo) expressing 5-LOX and different levels of COX-2 expression were used. The effects of aspirin (a non-selective COX inhibitor) and rofecoxib (COX-2 selective) on prostaglandin E2 (PGE2) and leukotriene B4 (LTB4) secretion were quantified by ELISA. Proliferation and viability were studied by quantifying double-stranded DNA (dsDNA) content and metabolic activity. Apoptosis was determined by annexin V and propidium iodide staining using confocal microscopy, and caspase-3/7 activity by fluorescent substrate assay. RESULTS COX inhibitors suppressed PGE2 production but enhanced LTB4 secretion in COX-2 expressing cell lines (P <0.001). The level of COX-2 expression in colorectal cancer cells did not significantly influence the anti-proliferative and pro-apoptotic effects of COX inhibitors due to the shunting mechanism. CONCLUSIONS This study provides evidence of shunting between COX and 5-LOX pathways in the presence of unilateral inhibition, and may explain the conflicting anti-carcinogenic effects reported with use of COX inhibitors.
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Affiliation(s)
- Radhakrishnan Ganesh
- Division of Surgery and Interventional Science, University College London, Rowland Hill Street, London NW3 2PF, UK.
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Rubner G, Bensdorf K, Wellner A, Bergemann S, Gust R. Synthesis, Characterisation and Biological Evaluation of Copper and Silver Complexes based on Acetylsalicylic Acid. Arch Pharm (Weinheim) 2011; 344:684-8. [DOI: 10.1002/ardp.201000382] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 01/20/2011] [Accepted: 01/20/2011] [Indexed: 11/07/2022]
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Guo W, Nie L, Wu D, Wise ML, Collins FW, Meydani SN, Meydani M. Avenanthramides inhibit proliferation of human colon cancer cell lines in vitro. Nutr Cancer 2011; 62:1007-16. [PMID: 21058188 DOI: 10.1080/01635581.2010.492090] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A high intake of whole grain foods is associated with reduced risk of colon cancer, but the mechanism underlying this protection has yet to be elucidated. Chronic inflammation and associated cyclooxygenase-2 (COX-2) expression in the colon epithelium are causally related to epithelial carcinogenesis, proliferation, and tumor growth. We examined the effect of avenanthramides (Avns), unique polyphenols from oats with anti-inflammatory properties, on COX-2 expression in macrophages, colon cancer cell lines, and on proliferation of human colon cancer cell lines. We found that Avns-enriched extract of oats (AvExO) had no effect on COX-2 expression, but it did inhibit COX enzyme activity and prostaglandin E(2) (PGE(2)) production in lipopolysaccharide-stimulated mouse peritoneal macrophages. Avns (AvExO, Avn-C, and the methylated form of Avn-C (CH3-Avn-C)) significantly inhibited cell proliferation of both COX-2-positive HT29, Caco-2, and LS174T, and COX-2-negative HCT116 human colon cancer cell lines, CH3-Avn-C being the most potent. However, Avns had no effect on COX-2 expression and PGE(2) production in Caco-2 and HT29 colon cancer cells. These results indicate that the inhibitory effect of Avns on colon cancer cell proliferation may be independent of COX-2 expression and PGE(2) production. Thus, Avns might reduce colon cancer risk through inhibition of macrophage PGE(2) production and non-COX-related antiproliferative effects in colon cancer cells. Interestingly, Avns had no effect on cell viability of confluence-induced differentiated Caco-2 cells, which display the characteristics of normal colonic epithelial cells. Our results suggest that the consumption of oats and oat bran may reduce the risk of colon cancer not only because of their high fiber content but also due to Avns, which attenuate proliferation of colonic cancer cells.
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Affiliation(s)
- Weimin Guo
- Jean Mayer USDA Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts 02111, USA
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Paduch R, Kandefer-Szerszeń M. Nitric Oxide (NO) and Cyclooxygenase-2 (COX-2) Cross-Talk in Co-Cultures of Tumor Spheroids with Normal Cells. CANCER MICROENVIRONMENT 2011; 4:187-98. [PMID: 21909878 PMCID: PMC3170423 DOI: 10.1007/s12307-011-0063-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Accepted: 02/09/2011] [Indexed: 12/20/2022]
Abstract
Cyclooxygenases (COX), prostaglandin E2 (PGE2) and nitric oxide (NO) are believed to be some of the most important factors related to colon cancer growth and metastasis. In this study, we aimed to investigate the associations between COX-2, PGE2 and NO in co-cultures of human colon cancer spheroids obtained from different tumor grades with normal human colonic epithelium and myofibroblast monolayers. L-arginine (2 mM), a substrate for nitric oxide synthases (NOS), decreased COX-2 and PGE2 levels, while NG-nitro-L-arginine methyl ester (L-NAME) (2 mM), a NOS inhibitor, had no influence on COX-2 and PGE2 levels but limited tumor cell motility. NS398 (75 μM), a selective COX-2 inhibitor, had no significant influence on NO level but decreased motility of tumor cells. COX-2, PGE2 and NO levels depended on the tumor grade of the cells, being the highest in Duke’s stage III colon carcinoma. Summing up, we showed that addition of L-arginine at doses which did not stimulate NO level caused a significant decrease in COX-2 and PGE2 amounts in co-cultures of colon tumor spheroids with normal epithelial cells and myofibroblasts. Any imbalances in NO level caused by exogenous factors influence COX-2 and PGE2 amounts depending on the kind of cells, their reciprocal interactions and the local microenvironmental conditions. The knowledge of these effects may be useful in limiting colon carcinoma progression and invasion.
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Affiliation(s)
- Roman Paduch
- Department of Virology and Immunology, Institute of Microbiology and Biotechnology, Maria Curie-Skłodowska University, Akademicka 19, 20-033, Lublin, Poland,
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[Cyclopentadienyl]metalcarbonyl complexes of acetylsalicylic acid as neo-anticancer agents. Eur J Med Chem 2010; 45:5157-63. [DOI: 10.1016/j.ejmech.2010.08.028] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2010] [Revised: 07/30/2010] [Accepted: 08/10/2010] [Indexed: 11/19/2022]
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Voutsadakis IA, Patrikidou A, Tsapakidis K, Karagiannaki A, Hatzidaki E, Stathakis NE, Papandreou CN. Additive inhibition of colorectal cancer cell lines by aspirin and bortezomib. Int J Colorectal Dis 2010; 25:795-804. [PMID: 20397022 DOI: 10.1007/s00384-010-0939-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/25/2010] [Indexed: 02/04/2023]
Abstract
PURPOSE To investigate the effect of cyclooxygenase-2 (Cox-2) inhibitor aspirin (acetylsalicylic acid, ASA) and proteasome inhibitor bortezomib in the proliferation and apoptosis of colorectal cancer cell lines. METHODS MTT assay, trypan blue exclusion and DNA fragmentation have been used to investigate cell proliferation and apoptosis in the presence of drugs. For the determination of Cox activity a colorimetric method was used. Western blotting was used for the measurement of the effect of the drugs in different proteins expression. RESULTS Bortezomib together with aspirin inhibit the growth of colorectal cancer cell lines HCT116, HT-29, and CaCo2 more than each drug alone. In the first two cell lines ASA inhibitory effects are Cox-2 independent because HCT116 cells do not express the enzyme while in HT-29 cells, Cox-2 has no activity as shown by a Cox activity assay. In CaCo2 cells that express enzymatically active Cox-2 this activity is inhibited by ASA. ASA is also able to suppress the increase in Cox-2 activity induced by bortezomib in these cells. Cell cycle inhibitors p21 and p27 are induced in the three cell lines by bortezomib and the combination treatment. Akt1 kinase is down-regulated in all three lines by the same treatments. Transcription factor NF-kappaB is retained in the cytoplasm by drug treatment in cell lines HCT116 and HT-29, a fact that may play a role in their pro-apoptotic activity. Pro-apoptotic bcl-2 family member, bad is down-regulated in cell lines HCT116 and CaCo2 by bortezomib treatment, a neoplasia-promoting event that is reversed by combination treatment. CONCLUSION The combination of bortezomib and ASA cooperates to decrease proliferation and induce apoptosis in three human colorectal cell lines with different genetic lesions. These effects are at least in some cases Cox-2 independent and involve common and diverse mechanisms in the three lines.
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Koelink PJ, Mieremet-Ooms MAC, Corver WE, Wolanin K, Hommes DW, Lamers CBHW, Verspaget HW. 5-aminosalicylic acid interferes in the cell cycle of colorectal cancer cells and induces cell death modes. Inflamm Bowel Dis 2010; 16:379-89. [PMID: 19774649 DOI: 10.1002/ibd.21086] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION Epidemiological data suggests that 5-aminosalicylic acid (5-ASA), a nonsteroidal antiinflammatory drug used in the treatment of inflammatory bowel diseases, prevents colorectal cancer development in these patients, although the mechanisms remain incompletely understood. METHODS AND RESULTS Here we report that 5-ASA prevents growth of several colorectal cancer cell lines by interfering in the cell cycle, i.e., an S-phase and G2/M phase arrest, dependent on 5-ASA dosage and concentration, together with an increased mitotic index. In addition, prolonged cell cycle arrest by repeated 5-ASA treatment induced apoptosis and caused abnormal spindle organization leading to mitotic catastrophe, another form of cell death. CONCLUSION These observations illustrate that 5-ASA has chemopreventive and chemotherapeutic properties.
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Affiliation(s)
- Pim J Koelink
- Department of Gastroenterology and Hepatology, and Leiden University Medical Center, Leiden, The Netherlands
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Zhang M, Abe Y, Matsushima T, Nishimura J, Nawata H, Muta K. Selective cyclooxygenase 2 inhibitor NS-398 induces apoptosis in myeloma cells via a Bcl-2 independent pathway. Leuk Lymphoma 2009; 46:425-33. [PMID: 15621834 DOI: 10.1080/10428190400015691] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
NS-398, a selective inhibitor of cyclooxygenase 2 (COX-2), has been reported to inhibit growth and induce apoptosis in several cancer cell lines that overexpress COX-2. However it has not been extensively studied in multiple myeloma (MM). Here, we studied the effects of COX-2 inhibitors on MM cell lines and primary myeloma patient cells. We investigated the effects of NS-398 on proliferation and apoptosis in three myeloma cell lines (PCM6, U266 and RPMI8226) and isolated CD138-positive cells from MM patients. Furthermore, the combined effects of NS-398 plus dexamethasone (Dex) or thalidomide (Thal) were investigated. All myeloma cell lines express COX-2. NS-398 inhibited growth and induced apoptosis in PCM6, RPMI8226 and CD138-positive MM cells in a time- and dose-dependent manner. At low concentrations (10 microM), NS-398 primarily induced growth arrest without affecting cell viability, but at higher concentrations (over 25 microM), apoptosis was induced. During the process of apoptosis, the number of Fas-positive cells increased. Downstream signals of Fas, such as caspase 8, 3 and 9, were also activated. On the other hand, protein levels of the Bcl-2 family did not change, although mitochondrial transmembrane potential ((Delta)(psi)m) was decreased. Combined incubation with Dex or Thal enhanced NS-398-induced growth inhibition and apoptosis in RPMI8226 cells. The combined effect of Dex was more potent than that of Thal. Our findings suggests that COX-2 plays an important role in regulation of apoptosis in myeloma cells, and COX-2 inhibitors might serve as an effective tool for future chemoprevention and/or treatment of myeloma.
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Affiliation(s)
- Min Zhang
- Department of Medicine and Bioregulatory Science, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
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Doherty GA, Byrne SM, Molloy ES, Malhotra V, Austin SC, Kay EW, Murray FE, Fitzgerald DJ. Proneoplastic effects of PGE2 mediated by EP4 receptor in colorectal cancer. BMC Cancer 2009; 9:207. [PMID: 19558693 PMCID: PMC2714158 DOI: 10.1186/1471-2407-9-207] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2009] [Accepted: 06/26/2009] [Indexed: 11/25/2022] Open
Abstract
Background Prostaglandin E2 (PGE2) is the major product of Cyclooxygenase-2 (COX-2) in colorectal cancer (CRC). We aimed to assess PGE2 cell surface receptors (EP 1–4) to examine the mechanisms by which PGE2 regulates tumour progression. Methods Gene expression studies were performed by quantitative RT-PCR. Cell cycle was analysed by flow cytometry with cell proliferation quantified by BrdU incorporation measured by enzyme immunoassay. Immunohistochemistry was employed for expression studies on formalin fixed paraffin embedded tumour tissue. Results EP4 was the most abundant subtype of PGE2 receptor in HT-29 and HCA7 cells (which show COX-2 dependent PGE2 generation) and was consistently the most abundant transcript in human colorectal tumours (n = 8) by qRT-PCR (ANOVA, p = 0.01). G0/G1 cell cycle arrest was observed in HT-29 cells treated with SC-236 5 μM (selective COX-2 inhibitor) for 24 hours (p = 0.02), an effect abrogated by co-incubation with PGE2 (1 μM). G0/G1 arrest was also seen with a specific EP4 receptor antagonist (EP4A, L-161982) (p = 0.01). Treatment of HT-29 cells with either SC-236 or EP4A caused reduction in intracellular cAMP (ANOVA, p = 0.01). Early induction in p21WAF1/CIP1 expression (by qRT-PCR) was seen with EP4A treatment (mean fold increase 4.4, p = 0.04) while other genes remained unchanged. Similar induction in p21WAF1/CIP1 was also seen with PD153025 (1 μM), an EGFR tyrosine kinase inhibitor, suggesting EGFR transactivation by EP4 as a potential mechanism. Additive inhibition of HCA7 proliferation was observed with the combination of SC-236 and neutralising antibody to amphiregulin (AR), a soluble EGFR ligand. Concordance in COX-2 and AR localisation in human colorectal tumours was noted. Conclusion COX-2 regulates cell cycle transition via EP4 receptor and altered p21WAF1/CIP1 expression. EGFR pathways appear important. Specific targeting of the EP4 receptor or downstream targets may offer a safer alternative to COX-2 inhibition in the chemoprevention of CRC.
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Affiliation(s)
- Glen A Doherty
- Molecular Medicine Group, Conway Institute of Biomolecular and Biomedical Research, University College Dublin, Dublin, Ireland.
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Baek SJ, Mcentee MF, Legendre AM. Review Paper: Cancer Chemopreventive Compounds and Canine Cancer. Vet Pathol 2009; 46:576-88. [DOI: 10.1354/vp.08-vp-0238-b-rev] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Canine cancer has become more prevalent in recent years because of increased life expectancy and greater attention to the health of pets. The range of cancers seen in dogs is as diverse as that in human patients, and despite more intensive therapeutic interventions, fatality rates remain unacceptably high in both species. Chemoprevention is therefore an important means of confronting this disease. Because domestic pets share our environment, greater cross-application and study of the protumorigenic and antitumorigenic factors in our shared environment will benefit all species, leading to the development of new families of less toxic antitumorigenic compounds based on novel and established molecular targets. Currently, the most interesting cancer preventive agents are nonsteroidal anti-inflammatory drugs, peroxisome proliferator-activated receptor-γ ligands, and dietary compounds. This article provides an overview of what is known about how these agents affect molecular signaling in neoplastic disease, with reference to reported application and/or study in dogs where available.
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Affiliation(s)
- S. J. Baek
- Department of Pathobiology, College of Veterinary Medicine, University of Tennessee, Knoxville, TN
| | - M. F. Mcentee
- Department of Pathobiology, College of Veterinary Medicine, University of Tennessee, Knoxville, TN
| | - A. M. Legendre
- Department of Small Animal Clinical Sciences, College of Veterinary Medicine, University of Tennessee, Knoxville, TN
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Taniura S, Kamitani H, Watanabe T, Eling TE. Induction of cyclooxygenase-2 expression by interleukin-1beta in human glioma cell line, U87MG. Neurol Med Chir (Tokyo) 2009; 48:500-5; discussion 505. [PMID: 19029777 DOI: 10.2176/nmc.48.500] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cyclooxygenase-2 (COX-2) is up-regulated in most high-grade gliomas, and high COX-2 expression is associated with aggressive character and poor prognosis. However, the effect of COX-2 in human glioma cell lines is not well known. This study examined the effect of several stimuli, including interleukin-1beta (IL-1beta) and carcinogens, on COX-2 induction in normal astrocyte cells and human glioma cell lines U87MG, A172, and T98G. IL-1beta-induced COX-2 expression strongly at both protein and messenger ribonucleic acid levels in only the U87MG cells of the glioma cell lines. Furthermore, carcinogen induced COX-2 expression. Similar findings were also observed in normal human astrocyte cells. The U87MG glioma cell line is a good model for COX-2 induction in glioma cell lines.
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Affiliation(s)
- Seijiro Taniura
- Department of Neurosurgery, Institute of Neurological Sciences, Faculty of Medicine, Tottori University, Yonago, Japan.
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16
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Löffler I, Grün M, Böhmer FD, Rubio I. Role of cAMP in the promotion of colorectal cancer cell growth by prostaglandin E2. BMC Cancer 2008; 8:380. [PMID: 19099561 PMCID: PMC2615781 DOI: 10.1186/1471-2407-8-380] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Accepted: 12/19/2008] [Indexed: 12/21/2022] Open
Abstract
Background Prostaglandin E2 (PGE2), a product of the cyclooxygenase (COX) reaction, stimulates the growth of colonic epithelial cells. It is inferred that the abrogation of prostaglandins' growth-promoting effects as a result of COX inhibition underlies the advantageous effects of non-steroidal anti-inflammatory drugs in colorectal carcinoma (CRC). Despite this appreciation, the underlying molecular mechanisms remain obscure since cell culture studies have yielded discrepant results regarding PGE2's mitogenicity. Methods We have employed several alternative approaches to score cell proliferation and apoptosis of 4 CRC cell lines exposed to PGE2 under various conditions. To investigate the role of cAMP in PGE2's functions, activation of the cAMP pathway was assessed at different levels (changes in cAMP levels and PKA activity) in cells subjected to specific manipulations including the use of specific inhibitors or prostanoid receptor-selective agonists/antagonists. Results Our data document that the dose-response curve to PGE2 is 'bell-shaped', with nano molar concentrations of PGE2 being more mitogenic than micro molar doses. Remarkably, mitogenicity inversely correlates with the ability of PGE2 doses to raise cAMP levels. Consistent with a major role for cAMP, cAMP raising agents and pertussis toxin revert the mitogenic response to PGE2. Accordingly, use of prostanoid receptor-selective agonists argues for the involvement of the EP3 receptor and serum deprivation of HT29 CRC cells specifically raises the levels of Gi-coupled EP3 splice variants. Conclusion The present data indicate that the mitogenic action of low PGE2 doses in CRC cells is mediated via Gi-proteins, most likely through the EP3 receptor subtype, and is superimposed by a second, cAMP-dependent anti-proliferative effect at higher PGE2 doses. We discuss how these findings contribute to rationalize conflictive literature data on the proliferative action of PGE2.
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Affiliation(s)
- Ivonne Löffler
- Institute of Molecular Cell Biology, Centre for Molecular Biomedicine, Friedrich-Schiller-University Jena, Drackendorfer Str,1, 07747 Jena, Germany.
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17
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Xiao H, Yang CS. Combination regimen with statins and NSAIDs: A promising strategy for cancer chemoprevention. Int J Cancer 2008; 123:983-90. [DOI: 10.1002/ijc.23718] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Heller DA, Fan TM, Lorimier LP, Charney SC, Barger AM, Tannehill-Gregg SH, Rosol TJ, Wallig MA. In Vitro Cyclooxygenase-2 Protein Expression and Enzymatic Activity in Neoplastic Cells. J Vet Intern Med 2007. [DOI: 10.1111/j.1939-1676.2007.tb03063.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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19
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Ogunwobi OO, Beales ILP. Cyclo-oxygenase-independent inhibition of apoptosis and stimulation of proliferation by leptin in human colon cancer cells. Dig Dis Sci 2007; 52:1934-45. [PMID: 17406816 DOI: 10.1007/s10620-007-9784-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2005] [Accepted: 01/18/2007] [Indexed: 01/08/2023]
Abstract
Obesity increases the risk of colon cancer. Hyperleptinemia is characteristic of obesity and leptin has been reported to be a colonic growth factor. We have examined the involvement of the cyclo-oxygenase (COX) pathways in the proliferation and anti-apoptotic effects of leptin. Leptin stimulated proliferation in HT-29 colon cancer cells: this was unaffected by inhibition of COX-1, COX-2, protein kinase C, or the epidermal growth factor receptor. Leptin did not increase COX-2 mRNA or COX-derived prostaglandin E2 production. Celecoxib induced apoptosis in a COX-independent manner. Leptin reduced both serum starvation- and celecoxib-induced apoptosis. Inhibition of ERK, p38 MAP kinase, and nuclear factor (NF)-kappaB abolished the growth-promoting and anti-apoptotic effects of leptin. Treatment of HT-29 cells with leptin stimulated phosphorylation of ERK and p38 MAP kinase and nuclear translocation of active NF-kappaB. We conclude that leptin stimulates colon cancer proliferation via COX-independent pathways and reduces celecoxib-induced apoptosis via ERK, p38 MAP kinase, and NF-kappaB pathways.
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Affiliation(s)
- Olorunseun Olatunji Ogunwobi
- Gastroenterology Research Unit, School of Medicine, Health Policy and Practice, University of East Anglia, Norwich, NR4 7TJ, UK
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20
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Hawcroft G, Ko CWS, Hull MA. Prostaglandin E2-EP4 receptor signalling promotes tumorigenic behaviour of HT-29 human colorectal cancer cells. Oncogene 2006; 26:3006-19. [PMID: 17130837 DOI: 10.1038/sj.onc.1210113] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The predominant product of cyclooxygenase (COX) activity in the colon, prostaglandin (PG) E2 promotes intestinal tumorigenesis. Expression of the PGE2 receptor EP4 is upregulated during colorectal carcinogenesis. Therefore, we investigated the role of elevated PGE2-EP4 receptor signalling in the protumorigenic activity of PGE2 by increasing EP4 receptor expression in HT-29 human colorectal cancer (CRC) cells (HT-29-EP4) by stable transfection. Elevated PGE2-induced EP4 receptor activity in HT-29 cells increased resistance to spontaneous apoptosis and promoted anchorage-independent growth, but had no effect on proliferation of HT-29-EP4 cells. EP4 receptor activation by PGE2 in HT-29-EP4 cells also led to development of fluid-filled cysts, which was associated with increased tight junction protein (occludin and zonula occludens-1) expression. Overexpression of the EP4 receptor in HT-29 cells led to basal EP4 receptor signalling in the absence of exogenous PGE2, which was explained by autocrine activity of endogenous, COX-2-derived PGE2 and constitutive, ligand-independent EP4 receptor activity. The predominant signalling pathway mediating antiapoptotic activity downstream of PGE2-EP4 receptor activation in HT-29-EP4 cells was elevation of cyclic adenosine monophosphate (cAMP) levels, which was associated with phosphorylation of cAMP-response element binding protein. EP4 receptor activation led to a small increase in phosphorylated extracellular signal-regulated kinase (ERK) 2 protein levels but inhibition of ERK phosphorylation did not abrogate the antiapoptotic activity of PGE2. However, PGE2-EP4 receptor signalling did not lead to trans-activation of the epidermal growth factor receptor in HT-29 cells. Inhibition of protumorigenic PGE2-EP4 receptor signalling represents a potential strategy for anti-CRC therapy that may avoid the toxicity associated with systemic COX inhibition.
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Affiliation(s)
- G Hawcroft
- Section of Molecular Gastroenterology, Leeds Institute of Molecular Medicine, University of Leeds, St James's University Hospital, Leeds LS9 7TF, UK.
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21
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Shibata Y, Gabbard J, Yamashita M, Tsuji S, Smith M, Nishiyama A, Henriksen RA, Myrvik QN. Heat‐killed BCG induces biphasic cyclooxygenase 2
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splenic macrophage formation—role of IL‐10 and bone marrow precursors. J Leukoc Biol 2006; 80:590-8. [PMID: 16822852 DOI: 10.1189/jlb.1205737] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Previous studies have shown that prostaglandin E(2) (PGE(2)) release by splenic F4/80(+) cyclooxygenase (COX)-2(+) macrophages (MØ) isolated from mice, treated with mycobacterial components, plays a major role in the regulation of immune responses. However, splenic MØ, isolated from untreated mice and treated in vitro with lipopolysaccharide and interferon-gamma, express COX-1 and COX-2 within 1 day but release only minimal amounts of PGE(2) following elicitation with calcium ionophore A23187. For further characterization of in vivo requirements for development of PGE(2)-releasing MØ (PGE(2)-MØ), C57Bl/6 [wild-type (WT)], and interleukin (IL)-10-deficient (IL-10(-/-)) mice were treated intraperitoneally with heat-killed Mycobacterium bovis bacillus Calmette-Guerin (HK-BCG). One day following injection, COX-2 was induced in splenic MØ of both mouse strains. However, PGE(2) biosynthesis by these MØ was not increased. Thus, expression of COX-2 is not sufficient to induce PGE(2) production in vivo or in vitro. In sharp contrast, 14 days after HK-BCG treatment, PGE(2) release by COX-2(+) splenic MØ increased as much as sevenfold, and a greater increase was seen in IL-10(-/-) cells than in WT cells. To further determine whether the 14-day splenic PGE(2)-MØ could be derived from bone marrow precursors, we established a chimera in which bone marrow cells were transfused from green fluorescent protein (GFP)-transgenic donors to WT mice. Donors and recipients were treated with HK-BCG simultaneously, and marrow transfusion was performed on Days 1 and 2. On Day 14 after BCG treatment, a significant number of spleen cells coexpressed COX-2 and GFP, indicating that bone marrow-derived COX-2(+) MØ may be responsible for the increased PGE(2) production.
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Affiliation(s)
- Yoshimi Shibata
- Department of Biomedical Sciences, Florida Atlantic University, 777 Glades Rd., P.O. Box 3091, Boca Raton, 33431-0991, USA.
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22
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Yin H, Xu H, Zhao Y, Yang W, Cheng J, Zhou Y. Cyclooxygenase-independent effects of aspirin on HT-29 human colon cancer cells, revealed by oligonucleotide microarrays. Biotechnol Lett 2006; 28:1263-70. [PMID: 16819585 DOI: 10.1007/s10529-006-9084-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2006] [Accepted: 04/19/2006] [Indexed: 01/04/2023]
Abstract
Aspirin and other non-steroidal anti-inflammatory drugs (NSAIDs) inhibit proliferation of human colon cancer cells in vitro. Transmission electron microscope detected morphological features of apoptosis in the aspirin-treated (5 mM, 72 h) HT-29 cells in which cyclooxygenoase-2 is catalytically inactive. We investigated aspirin-induced genome-wide expression changes in HT-29 cells and further studied the time- and concentration-dependent expression changes in 374 apoptosis-related genes, which is the first to show stimulation of genome-wide expression of HT-29 cells by aspirin. The most marked effects of aspirin are on ribosome assembly and rRNA metabolism, which could explain why the quasi-apoptotic morphological changes are not accompanied by a classical DNA ladder. These findings demonstrate that aspirin induces apoptosis in HT-29 cells, bolstering the hypothesis that apoptosis may be a mechanism by which NSAIDs inhibit colon carcinogenesis.
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Affiliation(s)
- Hongying Yin
- Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China
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23
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Haupt S, Kleinstern J, Haupt Y, Rubinstein A. Celecoxib can induce cell death independently of cyclooxygenase-2, p53, Mdm2, c-Abl and reactive oxygen species. Anticancer Drugs 2006; 17:609-19. [PMID: 16917206 DOI: 10.1097/01.cad.0000215055.40072.42] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Cell lines that do not overexpress functional cyclooxygenase-2 are resistant to the normal plasma levels of celecoxib achieved following oral ingestion. Cell growth inhibition was demonstrated after 24 h exposure to 80 micromol/l celecoxib while significant death was not detected at concentrations below 120 micromol/l following 24 h exposure. This growth inhibition and death induction was identified to be independent of p53 and Hdm2 in these cells, despite wild-type p53 stabilization and Hdm2 diminution in some lines. Cell death induced by celecoxib was preceded by the generation of reactive oxygen species within 4 h of drug exposure. The precise mechanism of elicitation of reactive oxygen species in these cells remains to be elucidated, although it was found to be independent of p53 and c-Abl, while in vitro, celecoxib enhanced superoxide radical production by xanthine oxidase. Importantly, the failure of anti-oxidants to protect from death indicates that celecoxib induces death independently of reactive oxygen species and that reactive oxygen species generation may be an insufficient trigger of death in p53-deficient cells.
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Affiliation(s)
- Sue Haupt
- Department of Hematology, Hadassah University Hospital, Jerusalem, Israel.
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24
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Haupt S, Zioni T, Gati I, Kleinstern J, Rubinstein A. Luminal delivery and dosing considerations of local celecoxib administration to colorectal cancer. Eur J Pharm Sci 2006; 28:204-11. [PMID: 16581235 DOI: 10.1016/j.ejps.2006.02.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2005] [Revised: 02/03/2006] [Accepted: 02/05/2006] [Indexed: 10/24/2022]
Abstract
The purpose of this study was to develop a biodegradable drug platform composed of chitosan and guar gum and to explore the possibility of using it for local adjuvant or neoadjuvant therapy of colorectal cancer. Celecoxib (Cx), a chemopreventative drug for familial adenomatous polyposis (FAP) and under trial for reducing post surgical colorectal malignancies, was selected as a model drug for this topical system because of the contraindications that are associated with its systemic administration. Films made of chitosan (Ct) and guar gum (GG) were prepared, characterized for equilibrium swelling, mucoadhesion, in vitro and in vivo degradation and loaded with Cx. Short term dosing studies in vitro were performed in the HT-29 colon carcinoma cell line that was incubated with Cx using the MTT test to assess IC50. The impact of a single high dose was evaluated and compared with a repeating low-dose regimen. In vivo dosing experiments with Cx were performed in the perfused intestine of the anaesthetized rat. Measuring tissue LDH assessed epithelium injury. Mechanical, mucoadhesion and in vitro degradation of the polysaccharide films were dictated by manipulating the ratios of Ct and GG. The addition of rat cecal contents to the dissolution medium increased the total Cx released from those films containing high amounts of GG. MTT reduction, a measure of cell proliferation, diminished as a function of increasing drug concentration and exposure time in the HT-29 cell line studies. Local high concentrations of Cx were shown to impede the proliferation of cancer cells directly, while chemoprevention has been demonstrated with low Cx doses. Healthy cells were shown to be sensitive to high Cx doses. Maximum therapeutic efficiency in the context of minimal healthy tissue exposure would thus be predicted utilizing a local delivery system such as the proposed adhesive, biodegradable polysaccharide composites.
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Affiliation(s)
- Sue Haupt
- The Hebrew University of Jerusalem, Faculty of Medicine, School of Pharmacy, P.O. Box 12065, Jerusalem 91120, Israel
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25
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van Erk MJ, Krul CAM, Caldenhoven E, Stierum RH, Peters WH, Woutersen RA, van Ommen B. Expression profiling of colon cancer cell lines and colon biopsies: towards a screening system for potential cancer-preventive compounds. Eur J Cancer Prev 2006; 14:439-57. [PMID: 16175049 DOI: 10.1097/01.cej.0000174781.51883.21] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Interest in mechanisms of colon cancer prevention by food compounds is strong and research in this area is often performed with cultured colon cancer cells. In order to assess utility for screening of potential cancer-preventive (food) compounds, expression profiles of 14 human cell lines derived from colonic tissue were measured using cDNA microarrays with 4000 genes and compared with expression profiles in biopsies of human colon tumours and normal tissue. Differences and similarities in the gene expression profiles of the cell lines were analysed by clustering and principal component analysis (PCA). Cytoskeleton genes and immune response genes are two functional classes of genes that contributed to the differences between the cell lines. A subset of 72 colon cancer-specific genes was identified by comparing expression profiles in human colon biopsies of tumour tissue and normal tissue. A separation of the cell lines based on the tumour stage of the original adenocarcinoma was observed after PCA of expression data of the subset of colon cancer-specific genes in the cell lines. The results of this study may be useful in the ongoing research into mechanisms of cancer prevention by dietary components.
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Affiliation(s)
- M J van Erk
- Wageningen University/TNO Centre for Food Toxicology, Wageningen, The Netherlands.
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Ottanà R, Carotti S, Maccari R, Landini I, Chiricosta G, Caciagli B, Vigorita MG, Mini E. In vitro antiproliferative activity against human colon cancer cell lines of representative 4-thiazolidinones. Part I. Bioorg Med Chem Lett 2005; 15:3930-3. [PMID: 15993594 DOI: 10.1016/j.bmcl.2005.05.093] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2005] [Revised: 05/20/2005] [Accepted: 05/25/2005] [Indexed: 10/25/2022]
Abstract
The characterization of two cyclooxygenase isoforms (COX), the rate-limiting enzyme for the synthesis of prostaglandins (PGs) from arachidonic acid, has allowed the development of COX-2 selective inhibitors as non-steroidal anti-inflammatory drugs (NSAIDs) with significant gastric tolerability. However, PGs are also important in cancer pathogenesis. Thus, there is an increasing interest in studying COX-2 inhibitors as potential drugs aimed at the prevention and treatment of cancer, especially colorectal cancer. The purpose of this study was to determine the inhibitory effects of some representative 4-thiazolidinones, already widely investigated as potential NSAIDs, on the growth of five human colon carcinoma cell lines with a different COX-2 expression, and to correlate them with COX-2 inhibitory properties. Our results preliminarily revealed that 2-phenylimino derivative 3 and 2,4-thiazolidindione 4 were the most active compounds. In particular, 3 mainly inhibited the HT29 cell line characterized by a high COX-2 expression, whereas 4 showed antiproliferative properties on all tested cell lines, suggesting molecular targets other than COX-2 inhibition.
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Affiliation(s)
- Rosaria Ottanà
- Dipartimento Farmaco-chimico, Università di Messina,Viale SS. Annunziata, 98168 Messina, Italy
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Wagner M, Loos J, Weksler N, Gantner M, Corless CL, Barry JM, Beer TM, Garzotto M. Resistance of prostate cancer cell lines to COX-2 inhibitor treatment. Biochem Biophys Res Commun 2005; 332:800-7. [PMID: 15907789 DOI: 10.1016/j.bbrc.2005.05.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2005] [Accepted: 05/03/2005] [Indexed: 10/25/2022]
Abstract
Targeting of cyclooxygenase-2 (COX-2) for cancer chemoprevention is well supported for several tumor types, most notably colon cancer. In contrast, the data for its role in prostate cancer carcinogenesis are correlative only. Thus, we compared the COX-2 expression, activity, and effects of inhibition in prostate cancer cells on COX-2-dependent colon cancer cells. COX-2 levels in benign and malignant human prostate tissue were determined by immunohistochemistry. Compared to colon cancer cells, prostate cancer cells expressed lower levels of COX-2, produced less PGE2, and were resistant to selective COX-2 inhibition. Examination of benign prostatic epithelium from prostatectomy samples demonstrated rare foci of COX-2. Whereas, human prostate cancer sections were uniformly negative for COX-2. In conclusion, these studies indicate the lack of a putative role for COX-2 in prostate cancer development. Direct evidence for the involvement of COX-2 in prostate cancer carcinogenesis is desperately needed.
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Affiliation(s)
- Matthew Wagner
- Division of Urology and Renal Transplantation, Oregon Health and Science University, Oregon Cancer Institute, Portland, OR, USA
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Nylund G, Nordgren S, Delbro DS. Demonstration of functional receptors for noradrenaline and adenosine-5'-triphosphate, but not for prostaglandin E2, in HT-29 human colon cancer cell line. ACTA ACUST UNITED AC 2004; 23:193-9. [PMID: 14690494 DOI: 10.1046/j.1474-8673.2003.00295.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
1. The aim of the current study was to investigate in HT-29 human colon cancer cell line, the existence of functional receptors for the signalling molecules, noradrenaline (NA), prostaglandin E2 (PGE2), and adenosine-5'-triphosphate (ATP). 2. We utilized microphysiometry, which monitors on-line extracellular acidification rate (ECAR) as a measure of cellular metabolic activity, and how this variable is altered by signalling molecules. 3. Challenge with NA (5.9 microM) resulted in an increase in ECAR by approximately 24% of basal. 4. PGE2 (0.0284, 0.284 and 2.84 microM) hardly affected ECAR. 5. ATP (100 microM) elicited a biphasic effect on ECAR (increase and decrease in ECAR by about 58 and 10% of basal, respectively). 6. HT-29 cells were shown to express COX-2 by immunocytochemistry. 7. These data suggest the presence of functional receptors for NA and ATP, but not for PGE2 in HT-29 human colon cancer cell line.
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Affiliation(s)
- G Nylund
- Department of Surgery, Institute of Surgical Sciences, Sahlgrenska University Hospital, SE-413 45 Göteborg, Sweden
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Hull MA, Ko SC, Hawcroft G. Prostaglandin EP receptors: Targets for treatment and prevention of colorectal cancer? Mol Cancer Ther 2004. [DOI: 10.1158/1535-7163.1031.3.8] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Abstract
The importance of the prostaglandin (PG) synthesis pathway, particularly the rate-limiting enzymatic step catalyzed by cyclooxygenase, to colorectal carcinogenesis and development of novel anticolorectal cancer therapy is well established. The predominant PG species in benign and malignant colorectal tumors is PGE2. PGE2 acts via four EP receptors termed EP1 to EP4. Recently, EP receptors have been identified as potential targets for treatment and/or prevention of colorectal cancer. This review summarizes existing knowledge of the expression and function of the EP receptor subtypes in human and rodent intestine during tumorigenic progression and describes the current literature on targeting EP receptor signaling during intestinal tumorigenesis.
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Affiliation(s)
- Mark A. Hull
- Molecular Medicine Unit, University of Leeds, St. James's University Hospital, Leeds, United Kingdom
| | - Stanley C.W. Ko
- Molecular Medicine Unit, University of Leeds, St. James's University Hospital, Leeds, United Kingdom
| | - Gillian Hawcroft
- Molecular Medicine Unit, University of Leeds, St. James's University Hospital, Leeds, United Kingdom
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Schönthal AH. Correspondence re: M. V. Swamy et al., Inhibition of COX-2 in colon cancer cell lines by celecoxib increases the nuclear localization of active p53. Cancer Res 2003;63:5239-42. Cancer Res 2004; 64:2937; author reply 2938. [PMID: 15087416 DOI: 10.1158/0008-5472.can-03-3145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Totzke G, Schulze-Osthoff K, Jänicke RU. Cyclooxygenase-2 (COX-2) inhibitors sensitize tumor cells specifically to death receptor-induced apoptosis independently of COX-2 inhibition. Oncogene 2003; 22:8021-30. [PMID: 12970750 DOI: 10.1038/sj.onc.1206837] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Cyclooxygenase-2 (COX-2) is involved in diverse processes such as inflammation, carcinogenesis and apoptosis. As COX-2 inhibitors interfere with these processes, inhibition of COX-2 has been suggested as a promising anticancer treatment. However, the role of COX-2 in modulation of apoptosis as well as the death pathways affected by COX-2 inhibitors are poorly characterized. Here we demonstrate that the selective COX-2 inhibitors NS-398 and nimesulide increased TNF sensitivity of TNF-resistant HeLa H21 and TNF-sensitive HeLa D98 cells, although this cytokine induced significant COX-2 activity, as judged by prostaglandin E(2) (PGE(2)) production, only in H21 cells. TNF did also not induce PGE(2) production in MCF-7/casp-3 cells stably expressing COX-2; however, nimesulide strongly enhanced TNF-induced apoptosis in these cells. Furthermore, COX-2 activity in HeLa H21 cells could be inhibited by NS-398 concentrations that were 10 000-fold lower compared to those required for the induction of cell death. Most intriguingly, sensibilization to apoptosis was specifically observed in response to activation of death receptors. Not only TNF-induced cell death but also apoptosis triggered by the CD95 and TRAIL receptors was enhanced by nimesulide. In contrast, apoptosis induced by the anticancer drugs doxorubicine and etoposide that target the mitochondrial death pathway remained unaffected. Together, our data suggest that COX-2 inhibitors overcome apoptosis resistance and selectively sensitize tumor cells to the extrinsic death receptor-induced apoptotic pathway independently of COX-2.
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Affiliation(s)
- Gudrun Totzke
- Institute of Molecular Medicine, University of Düsseldorf, D-40225 Düsseldorf, Germany
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Buecher B, Broquet A, Bouancheau D, Heymann MF, Jany A, Denis MG, Bonnet C, Galmiche JP, Blottière HM. Molecular mechanisms involved in the antiproliferative effect of two COX-2 inhibitors, nimesulide and NS-398, on colorectal cancer cell lines. Dig Liver Dis 2003; 35:557-65. [PMID: 14567460 DOI: 10.1016/s1590-8658(03)00272-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Cyclooxygenase (COX)-2 is up-regulated in most colorectal cancers. Chronic use of non-steroidal anti-inflammatory drugs, which target cyclooxygenases, have been shown to reduce the risk of these cancers. However, the mechanisms underlying this protective effect remain unclear. AIMS The aim of our study was to characterize the effects of two COX-2 selective inhibitors, NS-398 and nimesulide, on colorectal cancer cell proliferation, and to describe the molecular mechanisms involved. MATERIALS AND METHODS HT-29 and SW-1116 cell lines were cultured with either NS-398 or nimesulide. Cell proliferation was assessed by staining DNA with crystal violet. Cell cycle repartition and apoptosis were analysed by flow cytometry. The expression of COX-1 and COX-2. and of two cyclin dependent kinase inhibitors, p21Cip1 and p27Kip1, was analysed by Western blotting and RT-PCR. RESULTS Both drugs dose-dependently inhibited cell proliferation and induced G1 cell cycle blockade. HT-29 cells were more sensitive to both drugs than SW-1116 cells. p21Cip1 and p27Kip1 were induced on both cell lines. Concomitant induction of p21Cip1 mRNA indicates transcriptional modulation, whereas induction of p27Kip1 only at the protein level suggests post-translational modulation. CONCLUSION NS-398 and nimesulide inhibit colorectal cell proliferation through induction of p21Cip1 and p27Kip1.
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Affiliation(s)
- B Buecher
- INSERM, Human Nutrition Research Center, Department of Gastroenterology, CHU Hôtel-Dieu, Nantes, France
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Hull MA, Gardner SH, Hawcroft G. Activity of the non-steroidal anti-inflammatory drug indomethacin against colorectal cancer. Cancer Treat Rev 2003; 29:309-20. [PMID: 12927571 DOI: 10.1016/s0305-7372(03)00014-8] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A substantial body of evidence from rodent colon carcinogenesis models, in vitro experiments with human colorectal cancer cells and limited clinical observations in humans suggest that the non-steroidal anti-inflammatory drug indomethacin has anti-colorectal cancer activity. However, although many mechanisms of the anti-neoplastic activity of indomethacin have been suggested, e.g., cyclooxygenase inhibition and peroxisome proliferator-activated receptor gamma activation, the precise relevance of the majority of in vitro pharmacological observations to the in vivo anti-neoplastic activity of indomethacin remains unclear. Herein, we review the existing literature describing the chemopreventative and chemotherapeutic efficacy of indomethacin against colorectal cancer, and draw together the disparate literature describing potential mechanisms of action of indomethacin in human colorectal cancer cells in vitro. Although indomethacin itself has significant adverse effects, including serious upper gastrointestinal toxicity, the development of novel derivatives that may have an improved safety profile means that further investigation of the anti-colorectal cancer activity of indomethacin is warranted.
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Affiliation(s)
- M A Hull
- Molecular Medicine Unit, University of Leeds, Clinical Sciences Building, St. James's University Hospital, Leeds, LS9 7TF, UK.
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Eklou-Kalonji E, Andriamihaja M, Reinaud P, Mayeur C, Camous S, Robert V, Charpigny G, Blachier F. Prostaglandin-independent effects of aspirin on cell cycle and putrescine synthesis in human colon carcinoma cells. Can J Physiol Pharmacol 2003; 81:443-50. [PMID: 12774850 DOI: 10.1139/y03-058] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Aspirin consumption has been reported to be able to reduce colorectal cancer risk in humans and in animal models of colon carcinogenesis. Although the mechanism involved in such an effect is not yet clear, both prostaglandin-dependent and -independent effects have been proposed. Using HT-29 Glc(-/+)cells, which originate from a human colon adenocarcinoma, we demonstrated in this study a dose-dependent effect of millimolar concentration of aspirin on cell growth that was concomitant with a rapid accumulation of the cells in the G0/G1 phase, followed by an accumulation in the G2/M phase and by a minor increase in the proportion of cells undergoing nuclear condensation. Cell membrane integrity and cell release into the culture medium were not affected by this treatment. The aspirin effects were apparently unrelated to prostaglandin biosynthesis inhibition, since although these cells were found to express high levels of cyclooxygenase 1 (COX-1) and low levels of COX-2 proteins, they did not produce any measurable net amounts of prostaglandins, based on both utilization of radiolabelled arachidonic acid and the radioimmunoassay of prostaglandins E2 and F2 alpha. In contrast, we identified polyamine biosynthesis as a cellular target of aspirin, since the treatment of HT-29 Glc(-/+) cells with aspirin reduced the flux of L-ornithine through ornithine decarboxylase, an effect that could not be explained by an acute action of the drug on the ornithine decarboxylase catalytic activity. Since polyamine biosynthesis is strictly necessary for HT-29 cell growth, our data suggest that reduced flux through ornithine decarboxylase may participate in the antiproliferative activity of aspirin towards colonic tumoral cells. It is concluded that in HT-29 Glc(-/+) cells that are not functional for prostaglandin production, aspirin can affect cell growth, cell cycle, and polyamine biosynthesis without affecting cell membrane integrity.
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Affiliation(s)
- E Eklou-Kalonji
- Laboratoire de Nutrition et Sécurité Alimentaire, Institut National de la Recherche Agronomique, 78350 Jouy-en-Josas, France
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Mukhopadhyay D, Houchen CW, Kennedy S, Dieckgraefe BK, Anant S. Coupled mRNA stabilization and translational silencing of cyclooxygenase-2 by a novel RNA binding protein, CUGBP2. Mol Cell 2003; 11:113-26. [PMID: 12535526 DOI: 10.1016/s1097-2765(03)00012-1] [Citation(s) in RCA: 195] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Cyclooxygenase-2 (COX-2) expression is translationally silenced in epithelial cells undergoing radiation-induced apoptosis. CUGBP2, a predominantly nuclear protein, is also rapidly induced in response to radiation and translocates to the cytoplasm. Antisense-mediated suppression of CUGBP2 renders radioprotection through a COX-2-dependent prostaglandin pathway, providing an in vivo demonstration of translation inhibition activity for CUGBP2. CUGBP2 binds to two sets of AU-rich sequences (AREs) located within the first sixty nucleotides of the COX-2 3' untranslated region (3'UTR). Upon binding, CUGBP2 stabilizes a chimeric luciferase-COX-2 3'UTR mRNA but inhibits its translation. These findings identify a novel paradigm for RNA binding proteins in facilitating opposing functions of mRNA stability and translation inhibition and reveal a mechanism for inhibiting COX-2 expression in cancer cells.
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Affiliation(s)
- Debnath Mukhopadhyay
- Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA
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36
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Arico S, Pattingre S, Bauvy C, Gane P, Barbat A, Codogno P, Ogier-Denis E. Celecoxib induces apoptosis by inhibiting 3-phosphoinositide-dependent protein kinase-1 activity in the human colon cancer HT-29 cell line. J Biol Chem 2002; 277:27613-21. [PMID: 12000750 DOI: 10.1074/jbc.m201119200] [Citation(s) in RCA: 231] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Nonsteroidal anti-inflammatory drugs, which inhibit cyclooxygenase (COX) activity, are powerful antineoplastic agents that exert their antiproliferative and proapoptotic effects on cancer cells by COX-dependent and/or COX-independent pathways. Celecoxib, a COX-2-specific inhibitor, has been shown to reduce the number of adenomatous colorectal polyps in patients with familial adenomatous polyposis. Here, we show that celecoxib induces apoptosis in the colon cancer cell line HT-29 by inhibiting the 3-phosphoinositide-dependent kinase 1 (PDK1) activity. This effect was correlated with inhibition of the phosphorylation of the PDK1 downstream substrate Akt/protein kinase B (PKB) on two regulatory sites, Thr(308) and Ser(473). However, expression of a constitutive active form of Akt/PKB (myristoylated PKB) has a low protective effect toward celecoxib-induced cell death. In contrast, overexpression of constitutive active mutant of PDK1 (PDK1(A280V)) was as potent as the pancaspase inhibitor, benzyloxycarbonyl-Val-Ala-Asp-fluoromethylketone, to impair celecoxib-induced apoptosis. By contrast, cells expressing a kinase-defective mutant of PDK1 (PDK1(K114G)) remained sensitive to celecoxib. Furthermore, in vitro measurement reveals that celecoxib was a potential inhibitor of PDK1 activity with an IC(50) = 3.5 microm. These data indicate that inhibition of PDK1 signaling is involved in the proapoptotic effect of celecoxib in HT-29 cells.
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Affiliation(s)
- Sebastien Arico
- INSERM U504 Glycobiologie et Signalisation Cellulaire 16 avenue Paul-Vaillant-Couturier, Villejuif Cedex 94807, France
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Baek SJ, Wilson LC, Lee CH, Eling TE. Dual function of nonsteroidal anti-inflammatory drugs (NSAIDs): inhibition of cyclooxygenase and induction of NSAID-activated gene. J Pharmacol Exp Ther 2002; 301:1126-31. [PMID: 12023546 DOI: 10.1124/jpet.301.3.1126] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) are widely used drugs for the treatment of inflammatory disease and have a chemopreventive effect on colorectal cancer. NSAIDs inhibit cyclooxygenase (COX)-1 and/or COX-2 activity, but the chemopreventive effect may be, in part, independent of prostaglandin inhibition. NSAID-activated gene (NAG-1) was previously identified as a gene induced by some NSAIDs in cells devoid of COX activity. NAG-1 has proapoptotic and antitumorigenic activity in vitro and in vivo. To determine whether the induction of NAG-1 by NSAIDs is influenced by COX expression, we developed COX-1- and COX-2-overexpressing HCT-116 cells. COX expression did not affect NSAID-induced NAG-1 expression as assessed by transient and stable transfection. Also, NAG-1 expression was not affected by PGE(2) and arachidonic acid, suggesting that NAG-1 induction by NSAIDs occurs by a prostanoid-independent manner. We also report that indomethacin increased NAG-1 expression in a number of cells from tissues other than colorectal. In conclusion, NSAIDs have dual function, induction of NAG-1 expression and inhibition of COX activity that occurs in a variety of cell lines.
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Affiliation(s)
- Seung Joon Baek
- Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, National Institutes of Health, 111 TW Alexander Drive, Research Triangle Park, NC 27709, USA
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Ahn EH, Schroeder JJ. Sphingoid bases and ceramide induce apoptosis in HT-29 and HCT-116 human colon cancer cells. Exp Biol Med (Maywood) 2002; 227:345-53. [PMID: 11976405 DOI: 10.1177/153537020222700507] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Complex dietary sphingolipids such as sphingomyelin and glycosphingolipids have been reported to inhibit development of colon cancer. This protective role may be the result of turnover to bioactive metabolites including sphingoid bases (sphingosine and sphinganine) and ceramide, which inhibit proliferation and stimulate apoptosis. The purpose of the present study was to investigate the effects of sphingoid bases and ceramides on the growth, death, and cell cycle of HT-29 and HCT-116 human colon cancer cells. The importance of the 4,5-trans double bond present in both sphingosine and C(2)-ceramide (a short chain analog of ceramide) was evaluated by comparing the effects of these lipids with those of sphinganine and C(2)-dihydroceramide (a short chain analog of dihydroceramide), which lack this structural feature. Sphingosine, sphinganine, and C(2)-ceramide inhibited growth and caused death of colon cancer cells in time- and concentration-dependent manners, whereas C(2)-dihydroceramide had no effect. These findings suggest that the 4,5-trans double bond is necessary for the inhibitory effects of C(2)-ceramide, but not for sphingoid bases. Evaluation of cellular morphology via fluorescence microscopy and quantitation of fragmented low-molecular weight DNA using the diphenylamine assay demonstrated that sphingoid bases and C(2)-ceramide cause chromatin and nuclear condensation as well as fragmentation of DNA, suggesting these lipids kill colon cancer cells by inducing apoptosis. Flow cytometric analyses confirmed that sphingoid bases and C(2)-ceramide increased the number of cells in the A(0) peak indicative of apoptosis and demonstrated that sphingoid bases arrest the cell cycle at G(2)/M phase and cause accumulation in the S phase. These findings establish that sphingoid bases and ceramide induce apoptosis in colon cancer cells and implicate them as potential mediators of the protective role of more complex dietary sphingolipids in colon carcinogenesis.
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Affiliation(s)
- Eun Hyun Ahn
- Department of Food Science and Human Nutrition, Michigan State University, East Lansing, MI 48824-1224, USA
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39
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Resta-Lenert S, Barrett KE. Enteroinvasive bacteria alter barrier and transport properties of human intestinal epithelium: role of iNOS and COX-2. Gastroenterology 2002; 122:1070-87. [PMID: 11910358 DOI: 10.1053/gast.2002.32372] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND & AIMS Various invasive pathogens cause diarrhea, but the mechanism(s) are poorly understood. We hypothesized that nitric oxide and prostaglandins might modulate chloride secretory and barrier properties of the infected intestinal epithelium and that diarrhea is caused, in part, by altered expression of inducible NO synthase (iNOS) and cyclooxygenase 2 (COX-2). METHODS Studies were conducted in human intestinal epithelial cell lines (HT29/cl.19A, Caco-2, and T84). Cells were infected with enteroinvasive Escherichia coli (EIEC 029:NM) or Salmonella dublin (SD), or nonpathogenic, noninvasive bacteria (Streptococcus thermophilus [ST] and Lactobacillus acidophilus [LA]). Infected cells and controls were tested for transepithelial resistance, chloride secretion, prostaglandin E2, guanosine 3',5'-cyclic monophosphate and adenosine 3',5'-cyclic monophosphate, and protein expression. RESULTS Cells infected with EIEC or SD, but not uninfected controls or ST/LA-exposed monolayers, showed a progressive reduction in transepithelial resistance starting at 6-12 hours. Infected HT29/cl.19A and Caco-2 cells, but not T84 cells, also showed an increase in total nitrite. Expression of iNOS, and consequently COX-2, was also increased, followed by increased production of prostaglandins and cyclic nucleotides. Furthermore, basal and stimulated chloride secretory responses to various agonists were enhanced in HT29/cl.19A and Caco-2 cells after infection with enteroinvasive bacteria, and this effect was reversed for some agonists by iNOS or COX-2 inhibitors. Increased expression of cystic fibrosis transmembrane conductance regulator and NKCC1 was also observed in EIEC or SD-infected cells vs. controls, secondary to NO synthase activity. CONCLUSIONS Up-regulation of iNOS and COX-2 by enteroinvasive bacteria can modulate chloride secretion and barrier function in intestinal epithelial cells. Thus, these enzymes represent possible therapeutic targets in infectious diarrhea.
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Affiliation(s)
- Silvia Resta-Lenert
- Department of Medicine, and Biomedical Sciences Ph.D. Program, University of California, San Diego, School of Medicine, San Diego, California, USA.
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40
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Bessa X, Elizalde JI, Mitjans F, Piñol V, Miquel R, Panés J, Piulats J, Piqué JM, Castells A. Leukocyte recruitment in colon cancer: role of cell adhesion molecules, nitric oxide, and transforming growth factor beta1. Gastroenterology 2002; 122:1122-32. [PMID: 11910362 DOI: 10.1053/gast.2002.32369] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND & AIMS A deficient leukocyte recruitment has been suggested in tumor vasculature, but little is known about the underlying molecular mechanism. To characterize leukocyte-endothelium interaction in experimental colon cancer, quantify the main endothelial cell adhesion molecules (CAMs), and evaluate the effect of tumor-derived products. METHODS Leukocyte recruitment was assessed by intravital videomicroscopy in mice bearing HT29-derived tumors. Endothelial CAMs were measured using the dual-radiolabeled antibody technique. The role of molecules mediating leukocyte rolling (P-, E-, and L-selectin) or adhesion (intercellular adhesion molecule 1 [ICAM-1] and vascular cell adhesion molecule 1 [VCAM-1]) carcinoembryonic antigen (CEA), and transforming growth factor (TGF) beta1 was assessed through immunoblockade, whereas participation of nitric oxide (NO) and cyclooxygenase (COX) metabolites were evaluated by means of nonselective and selective inhibition. RESULTS Basal and lipopolysaccharide-stimulated leukocyte rolling and adhesion were markedly reduced in tumor vasculature. ICAM-1 immunoblockade prevented leukocyte adhesion in both tumor and nontumor microvessels. Neither baseline nor LPS-induced endothelial ICAM-1, P-, and E-selectin expression in tumors were reduced with respect to nontumor vasculature. Although VCAM-1 expression was reduced in tumor endothelium, immunoneutralization of VCAM-1 failed to reverse LPS-induced leukocyte recruitment in this setting. CEA immunoblockade and COX inhibition did not modify the deficient leukocyte rolling. Nonselective NO inhibition partially reversed the defective adhesion response in tumor microvessels. Finally, TGF-beta1 immunoblockade partially and selectively restored impaired leukocyte rolling and adhesion in tumor microvessels. CONCLUSIONS Impaired leukocyte recruitment in tumor vasculature cannot be attributed to a depressed expression of the main CAMs. Selective restoration after NO inhibition and TGF-beta1 immunoblockade suggests involvement of both molecules in this phenomenon.
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Affiliation(s)
- Xavier Bessa
- Gastroenterology Department, Institut de Malalties Digestives, Hospital Clínic, Institut d'Investigacions Biomèdiques Agust Pi i Sunyer, University of Barcelona, Barcelona, Spain
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Iizaka M, Furukawa Y, Tsunoda T, Akashi H, Ogawa M, Nakamura Y. Expression profile analysis of colon cancer cells in response to sulindac or aspirin. Biochem Biophys Res Commun 2002; 292:498-512. [PMID: 11906190 DOI: 10.1006/bbrc.2002.6648] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) have a preventive effect against colorectal cancer. Although inhibition of cyclooxygenase-2 plays a crucial role in the suppression of tumors, precise mechanisms of their action remain to be disclosed. To identify genes involved in the growth-suppressive effect of NSAIDs, we utilized cDNA microarray containing 23,040 genes and analyzed time-dependent alteration of gene expression in response to sulindac or aspirin in NSAIDs-sensitive SW480 and SW948 colon-cancer cells as well as in relatively resistant SNU-C4 cells. Consequently we identified 112 genes with commonly altered expression by sulindac and 176 with commonly altered expression by aspirin in the three lines. Addition of sulindac and that of aspirin altered expression levels of 130 and 140 genes, respectively, in SW480 and SW948 cells but not in SNU-C4 cells. These data may lead to a better understanding of growth-suppressive effects on colonic epithelium, and may provide clues for identifying novel therapeutic and/or preventive molecular targets of colon cancer.
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Affiliation(s)
- Masayoshi Iizaka
- Laboratory of Molecular Medicine, Human Genome Center, Institute of Medical Science, University of Tokyo, Minato, Tokyo, Japan
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Yokota Y, Notoya M, Higashino K, Ishimoto Y, Nakano K, Arita H, Hanasaki K. Clearance of group X secretory phospholipase A(2) via mouse phospholipase A(2) receptor. FEBS Lett 2001; 509:250-4. [PMID: 11741598 DOI: 10.1016/s0014-5793(01)03173-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Given the potent hydrolyzing activity toward phosphatidylcholine, group X secretory phospholipase A(2) (sPLA(2)-X) elicits a marked release of arachidonic acid linked to the potent production of lipid mediators in various cell types. We have recently shown that sPLA(2)-X can also act as a ligand for mouse phospholipase A(2) receptor (PLA(2)R). Here, we found that sPLA(2)-X was internalized and degraded via binding to PLA(2)R associated with the diminished prostaglandin E(2) (PGE(2)) formation in PLA(2)R-expressing Chinese hamster ovary (CHO) cells compared to CHO cells. Indirect immunocytochemical analysis revealed that internalized sPLA(2)-X was co-localized with PLA(2)R in the punctate structures in PLA(2)R-expressing CHO cells. Moreover, in mouse osteoblastic MC3T3-E(1) cells that endogenously express the PLA(2)R, the internalized sPLA(2)-X was localized in lysosomes. These findings demonstrate that PLA(2)R acts as a clearance receptor for sPLA(2)-X to suppress its strong enzymatic activity.
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Affiliation(s)
- Y Yokota
- Shionogi Research Laboratories, Shionogi and Co., Ltd., Sagisu 5-12-4, Fukushima-ku, 553-0002, Osaka, Japan
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Bauvy C, Gane P, Arico S, Codogno P, Ogier-Denis E. Autophagy delays sulindac sulfide-induced apoptosis in the human intestinal colon cancer cell line HT-29. Exp Cell Res 2001; 268:139-49. [PMID: 11478840 DOI: 10.1006/excr.2001.5285] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Autophagy is a major catabolic process allowing the renewal of intracellular organelles by which cells maintain their homeostasis. We have previously shown that autophagy is controlled by two transduction pathways mediated by a heterotrimeric Gi3 protein and phosphatidylinositol 3-kinase activities in the human colon cancer cell line HT-29. Here, we show that 3-methyladenine, an inhibitor of autophagy, increases the sensitivity of HT-29 cells to apoptosis induced by sulindac sulfide, a nonsteroidal anti-inflammatory drug which inhibits the cyclooxygenases. Similarly, HT-29 cells overexpressing a GTPase-deficient mutant of the G(alpha i3) protein (Q204L), which have a low rate of autophagy, were more sensitive to sulindac sulfide-induced apoptosis than parental HT-29 cells. In both cell populations we did not observe differences in the expression patterns of COX-2, Bcl-2, Bcl(XL), Bax, and Akt/PKB activity. However, the rate of cytochrome c release was higher in Q204L-overexpressing cells than in HT-29 cells. These results suggest that autophagy could retard apoptosis in colon cancer cells by sequestering mitochondrial death-promoting factors such as cytochrome c.
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Affiliation(s)
- C Bauvy
- INSERM U504 Glycobiologie et Signalisation Cellulaire, 16, Avenue Paul-Vaillant Couturier, 94807 Villejuif Cedex, France
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Baek SJ, Kim KS, Nixon JB, Wilson LC, Eling TE. Cyclooxygenase Inhibitors Regulate the Expression of a TGF-β Superfamily Member That Has Proapoptotic and Antitumorigenic Activities. Mol Pharmacol 2001. [DOI: 10.1124/mol.59.4.901] [Citation(s) in RCA: 309] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Merritt G, Aliprandis ET, Prada F, Rigas B, Kashfi K. The retinoid fenretinide inhibits proliferation and downregulates cyclooxygenase-2 gene expression in human colon adenocarcinoma cell lines. Cancer Lett 2001; 164:15-23. [PMID: 11166911 DOI: 10.1016/s0304-3835(00)00714-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Fenretinide [N-(4-Hydroxyphenyl)retinamide, 4-HPR] (10(-10)-10(-6) M) treatment of HT-29 human colon cancer cells for 24-72 h significantly inhibited their growth. Using HCT-15 cells, 4-HPR had limited inhibitory effects on cell proliferation over the same concentration range and time period. The inhibitory effects of 4-HPR on cell growth in HT-29 cells were markedly reduced in the presence of exogenously added prostaglandins (PGs), suggesting a possible role for inhibition of PG synthesis as a mechanism for 4-HPR's antiproliferative effects. Inhibition of PGE(2) production was caused by 4-HPR in a concentration-dependent manner and decreased COX-2 but not COX-1 mRNA levels; this is the first indication that 4-HPR selectively inhibits COX-2 gene expression. Our findings suggest a possible mechanism for the chemopreventive and anti-proliferative effects of 4-HPR.
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Affiliation(s)
- G Merritt
- New York Hospital Medical Center of Queens, New York, NY, USA
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