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Kazanietz MG, Cooke M. Protein kinase C signaling "in" and "to" the nucleus: Master kinases in transcriptional regulation. J Biol Chem 2024; 300:105692. [PMID: 38301892 PMCID: PMC10907189 DOI: 10.1016/j.jbc.2024.105692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 01/08/2024] [Accepted: 01/09/2024] [Indexed: 02/03/2024] Open
Abstract
PKC is a multifunctional family of Ser-Thr kinases widely implicated in the regulation of fundamental cellular functions, including proliferation, polarity, motility, and differentiation. Notwithstanding their primary cytoplasmic localization and stringent activation by cell surface receptors, PKC isozymes impel prominent nuclear signaling ultimately impacting gene expression. While transcriptional regulation may be wielded by nuclear PKCs, it most often relies on cytoplasmic phosphorylation events that result in nuclear shuttling of PKC downstream effectors, including transcription factors. As expected from the unique coupling of PKC isozymes to signaling effector pathways, glaring disparities in gene activation/repression are observed upon targeting individual PKC family members. Notably, specific PKCs control the expression and activation of transcription factors implicated in cell cycle/mitogenesis, epithelial-to-mesenchymal transition and immune function. Additionally, PKCs isozymes tightly regulate transcription factors involved in stepwise differentiation of pluripotent stem cells toward specific epithelial, mesenchymal, and hematopoietic cell lineages. Aberrant PKC expression and/or activation in pathological conditions, such as in cancer, leads to profound alterations in gene expression, leading to an extensive rewiring of transcriptional networks associated with mitogenesis, invasiveness, stemness, and tumor microenvironment dysregulation. In this review, we outline the current understanding of PKC signaling "in" and "to" the nucleus, with significant focus on established paradigms of PKC-mediated transcriptional control. Dissecting these complexities would allow the identification of relevant molecular targets implicated in a wide spectrum of diseases.
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Affiliation(s)
- Marcelo G Kazanietz
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
| | - Mariana Cooke
- Department of Systems Pharmacology and Translational Therapeutics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
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2
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Aquino A, Bianchi N, Terrazzan A, Franzese O. Protein Kinase C at the Crossroad of Mutations, Cancer, Targeted Therapy and Immune Response. BIOLOGY 2023; 12:1047. [PMID: 37626933 PMCID: PMC10451643 DOI: 10.3390/biology12081047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/18/2023] [Accepted: 07/21/2023] [Indexed: 08/27/2023]
Abstract
The frequent PKC dysregulations observed in many tumors have made these enzymes natural targets for anticancer applications. Nevertheless, this considerable interest in the development of PKC modulators has not led to the expected therapeutic benefits, likely due to the complex biological activities regulated by PKC isoenzymes, often playing ambiguous and protective functions, further driven by the occurrence of mutations. The structure, regulation and functions of PKCs have been extensively covered in other publications. Herein, we focused on PKC alterations mostly associated with complete functional loss. We also addressed the modest yet encouraging results obtained targeting PKC in selected malignancies and the more frequent negative clinical outcomes. The reported observations advocate the need for more selective molecules and a better understanding of the involved pathways. Furthermore, we underlined the most relevant immune mechanisms controlled by PKC isoforms potentially impacting the immune checkpoint inhibitor blockade-mediated immune recovery. We believe that a comprehensive examination of the molecular features of the tumor microenvironment might improve clinical outcomes by tailoring PKC modulation. This approach can be further supported by the identification of potential response biomarkers, which may indicate patients who may benefit from the manipulation of distinctive PKC isoforms.
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Affiliation(s)
- Angelo Aquino
- Department of Systems Medicine, University of Rome Tor Vergata, 00133 Rome, Italy;
| | - Nicoletta Bianchi
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (N.B.); (A.T.)
| | - Anna Terrazzan
- Department of Translational Medicine, University of Ferrara, 44121 Ferrara, Italy; (N.B.); (A.T.)
- Laboratory for Advanced Therapy Technologies (LTTA), University of Ferrara, 44121 Ferrara, Italy
| | - Ornella Franzese
- Department of Systems Medicine, University of Rome Tor Vergata, 00133 Rome, Italy;
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3
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Kawano T, Inokuchi J, Eto M, Murata M, Kang JH. Protein Kinase C (PKC) Isozymes as Diagnostic and Prognostic Biomarkers and Therapeutic Targets for Cancer. Cancers (Basel) 2022; 14:5425. [PMID: 36358843 PMCID: PMC9658272 DOI: 10.3390/cancers14215425] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 11/02/2022] [Accepted: 11/02/2022] [Indexed: 08/05/2023] Open
Abstract
Protein kinase C (PKC) is a large family of calcium- and phospholipid-dependent serine/threonine kinases that consists of at least 11 isozymes. Based on their structural characteristics and mode of activation, the PKC family is classified into three subfamilies: conventional or classic (cPKCs; α, βI, βII, and γ), novel or non-classic (nPKCs; δ, ε, η, and θ), and atypical (aPKCs; ζ, ι, and λ) (PKCλ is the mouse homolog of PKCι) PKC isozymes. PKC isozymes play important roles in proliferation, differentiation, survival, migration, invasion, apoptosis, and anticancer drug resistance in cancer cells. Several studies have shown a positive relationship between PKC isozymes and poor disease-free survival, poor survival following anticancer drug treatment, and increased recurrence. Furthermore, a higher level of PKC activation has been reported in cancer tissues compared to that in normal tissues. These data suggest that PKC isozymes represent potential diagnostic and prognostic biomarkers and therapeutic targets for cancer. This review summarizes the current knowledge and discusses the potential of PKC isozymes as biomarkers in the diagnosis, prognosis, and treatment of cancers.
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Affiliation(s)
- Takahito Kawano
- Center for Advanced Medical Innovation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Junichi Inokuchi
- Department of Urology, Graduate School of Medical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Masatoshi Eto
- Center for Advanced Medical Innovation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
- Department of Urology, Graduate School of Medical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Masaharu Murata
- Center for Advanced Medical Innovation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Jeong-Hun Kang
- Division of Biopharmaceutics and Pharmacokinetics, National Cerebral and Cardiovascular Center Research Institute, 6-1 Shinmachi, Kishibe, Suita, Osaka 564-8565, Japan
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4
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Song GR, Choi YJ, Park SJ, Shin S, Lee G, Choi HJ, Lee DY, Song GY, Oh S. Root Bark of Morus alba L. and Its Bioactive Ingredient, Ursolic Acid, Suppress the Proliferation of Multiple Myeloma Cells by Inhibiting Wnt/β-Catenin Pathway. J Microbiol Biotechnol 2021; 31:1559-1567. [PMID: 34584036 PMCID: PMC9706038 DOI: 10.4014/jmb.2109.09002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Revised: 09/22/2021] [Accepted: 09/23/2021] [Indexed: 12/15/2022]
Abstract
The root bark of Morus alba L. has cytotoxic activity against several types of cancer cells. However, little is known about its chemopreventive mechanisms and bioactive metabolites. In this study, we showed that M. alba L. root bark extracts (MRBE) suppressed β-catenin response transcription (CRT), which is aberrantly activated in various cancers, by promoting the degradation of β-catenin. In addition, MRBE repressed the expression of the β-catenin/T-cell factor (TCF)-dependent genes, cmyc and cyclin D1, thus inhibiting the proliferation of RPMI-8226 multiple myeloma (MM) cells. MRBE induced apoptosis in MM cells, as evidenced by the increase in the population of annexin VFITC- positive cells and caspase-3/7 activity. We identified ursolic acid in MRBE through LC/mass spectrum (MS) and observed that it also decreased intracellular β-catenin, c-myc, and cyclin D1 levels. Furthermore, it suppressed the proliferation of RPMI-8226 cells by stimulating cell cycle arrest and apoptosis. These findings suggest that MRBE and its active ingredient, ursolic acid, exert antiproliferative activity by promoting the degradation of β-catenin and may have significant chemopreventive potential against MM.
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Affiliation(s)
- Geu Rim Song
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 02707, Republic of Korea
- Department of Interdisciplinary Program for Bio-Health Convergence, Kookmin University, Seoul 02707, Republic of Korea
| | - Yoon Jung Choi
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Soo Jin Park
- Department of Agricultural Biotechnology, Center for Food and Bioconvergence, Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Subeen Shin
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 02707, Republic of Korea
- Department of Interdisciplinary Program for Bio-Health Convergence, Kookmin University, Seoul 02707, Republic of Korea
| | - Giseong Lee
- College of General Education, Kookmin University, Seoul 02707, Republic of Korea
| | - Hui Ji Choi
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Do Yup Lee
- Department of Agricultural Biotechnology, Center for Food and Bioconvergence, Research Institute for Agricultural and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Gyu-Yong Song
- College of Pharmacy, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Sangtaek Oh
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 02707, Republic of Korea
- Department of Interdisciplinary Program for Bio-Health Convergence, Kookmin University, Seoul 02707, Republic of Korea
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5
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Black AR, Black JD. The complexities of PKCα signaling in cancer. Adv Biol Regul 2021; 80:100769. [PMID: 33307285 PMCID: PMC8141086 DOI: 10.1016/j.jbior.2020.100769] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 11/15/2020] [Indexed: 01/06/2023]
Abstract
Protein kinase C α (PKCα) is a ubiquitously expressed member of the PKC family of serine/threonine kinases with diverse functions in normal and neoplastic cells. Early studies identified anti-proliferative and differentiation-inducing functions for PKCα in some normal tissues (e.g., regenerating epithelia) and pro-proliferative effects in others (e.g., cells of the hematopoietic system, smooth muscle cells). Additional well documented roles of PKCα signaling in normal cells include regulation of the cytoskeleton, cell adhesion, and cell migration, and PKCα can function as a survival factor in many contexts. While a majority of tumors lose expression of PKCα, others display aberrant overexpression of the enzyme. Cancer-related mutations in PKCα are uncommon, but rare examples of driver mutations have been detected in certain cancer types (e. g., choroid gliomas). Here we review the role of PKCα in various cancers, describe mechanisms by which PKCα affects cancer-related cell functions, and discuss how the diverse functions of PKCα contribute to tumor suppressive and tumor promoting activities of the enzyme. We end the discussion by addressing mutations and expression of PKCα in tumors and the clinical relevance of these findings.
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Affiliation(s)
- Adrian R Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, 68198, USA
| | - Jennifer D Black
- Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, NE, 68198, USA.
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6
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Upregulation of miR-92a-2-5p potentially contribute to anorectal malformations by inhibiting proliferation and enhancing apoptosis via PRKCA/β-catenin. Biomed Pharmacother 2020; 127:110117. [DOI: 10.1016/j.biopha.2020.110117] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 03/17/2020] [Accepted: 03/19/2020] [Indexed: 02/07/2023] Open
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Cytotoxic Activity of Aplykurodin A Isolated From Aplysia kurodai against AXIN1-Mutated Hepatocellular Carcinoma Cells by Promoting Oncogenic β-Catenin Degradation. Mar Drugs 2020; 18:md18040210. [PMID: 32294900 PMCID: PMC7230895 DOI: 10.3390/md18040210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/09/2020] [Accepted: 04/11/2020] [Indexed: 11/24/2022] Open
Abstract
Dysregulation of the Wnt/β-catenin signaling pathway is involved in the development of human hepatocellular carcinoma and has thus emerged as a therapeutic target for this malignant tumor. In this study, we employed sensitive cell-based assays to identify aplykurodin A isolated from Aplysia kurodai as an antagonist of Wnt/β-catenin signaling. Aplykurodin A inhibited β-catenin responsive transcription, which was stimulated by a Wnt3a-conditioned medium or a glycogen synthase kinase 3β inhibitor by accelerating intracellular β-catenin degradation. Aplykurodin A downregulated the level of oncogenic β-catenin and decreased the expression of β-catenin-dependent gene, leading to inhibition of human hepatoma Hep3B and SNU475 cell proliferation. Moreover, apoptosis and autophagy were elicited by aplykurodin A, as indicated by an increase the number of Annexin V-FITC-stained cells and the formation of microtubule-associated protein 1 light chain 3 puncta, respectively, in Hep3B and SNU475 cells. Our findings suggest that aplykurodin A provides a novel therapeutic strategy for human hepatocellular carcinoma via stimulation of oncogenic β-catenin degradation.
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8
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Nam TW, Park SY, Lee JH, Roh JI, Lee HW. Effect of EI24 expression on the tumorigenesis of Apc Min/+ colorectal cancer mouse model. Biochem Biophys Res Commun 2019; 514:1087-1092. [PMID: 31097220 DOI: 10.1016/j.bbrc.2019.04.186] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 04/27/2019] [Indexed: 12/14/2022]
Abstract
Etoposide-induced 2.4 kb transcript (EI24, also known as PIG8) is a p53 target gene involved in cell growth suppression and apoptosis and known to be frequently altered in human cancers. Although EI24 expression is decreased in various cancers and is associated with colorectal cancer progression and metastasis, the physiological function of EI24 in colorectal cancer is yet unclear. We generated an Ei24 conditional transgenic (Tg) mouse to study the therapeutic effects of Ei24 in vivo and evaluated whether Ei24 plays a role of a tumor suppressor using Ei24 Tg mouse crossed with ApcMin/+ mouse, which develops multiple intestinal adenomas. The overexpression of Ei24 failed to cause any notable difference in the number of polyps, lengths of the intestine and spleen, and survival rate between ApcMin/+ and ApcMin/+Ei24 Tg mice. Ei24 plays no significant role in colon cancer caused by the substitutional mutation of Apc in mice. Therefore, our result dismisses the hypothesized direct link between ApcMin/+ mutation and Ei24 expression in colorectal cancer model.
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Affiliation(s)
- Tae Wook Nam
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Song Yi Park
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Jae Hoon Lee
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Jae Il Roh
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea
| | - Han-Woong Lee
- Department of Biochemistry, College of Life Science and Biotechnology, Yonsei University, Seoul 03722, Republic of Korea.
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9
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Shin S, Son Y, Liu KH, Kang W, Oh S. Cytotoxic activity of broussochalcone a against colon and liver cancer cells by promoting destruction complex-independent β-catenin degradation. Food Chem Toxicol 2019; 131:110550. [PMID: 31163223 DOI: 10.1016/j.fct.2019.05.058] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 05/24/2019] [Accepted: 05/31/2019] [Indexed: 02/08/2023]
Abstract
Aberrant activation of β-catenin-response transcription (CRT) is a well-recognized characteristic of colorectal and liver cancers and thus a potential therapeutic target for these malignancies. Broussonetia papyrifera (paper mulberry) has been used as a herbal medicine to treat various diseases. Using a sensitive cell-based screening system, we identified broussochalcone A (BCA), a prenylated chalcone isolated from Broussonetia papyrifera, as an antagonist of CRT. BCA accelerated the turnover of intracellular β-catenin that was accompanied by its N-terminal phosphorylation at Ser33/37/Thr41 residues, marking it for ubiquitin-dependent proteasomal degradation. Pharmacological inhibition of glycogen synthase kinase-3β could not abrogate BCA-mediated degradation of β-catenin. BCA decreased the intracellular β-catenin levels in colon and liver cancer cells with mutations in β-catenin, adenomatous polyposis coli, and Axin. BCA repressed the expressions of cyclin D1, c-Myc, and Axin2, which are β-catenin/T-cell factor-dependent genes, and thus decreased the viability of colon and liver cancer cell. Moreover, apoptosis was elicited by BCA, as indicated by the increase in the population of Annexin V-FITC positive cells and caspase-3/7 activities in colon and liver cancer cells. These findings indicate that BCA exerts its cytotoxic effects by promoting phosphorylation/ubiquitin-dependent degradation of β-catenin and may potentially serve as a chemopreventive agent for colonrectal and liver cancers.
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Affiliation(s)
- Sora Shin
- Department of Bio and Fermentation Convergence Technology, BK21 PLUS Program, Kookmin University, Seoul, 02707, Republic of Korea
| | - Younglim Son
- Department of Bio and Fermentation Convergence Technology, BK21 PLUS Program, Kookmin University, Seoul, 02707, Republic of Korea
| | - Kwang-Hyeon Liu
- BK21 Plus KNU Multi-Omics Based Creative Drug Research Team, College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Wonku Kang
- College of Pharmacy, Chung-Ang Univsersity, Seoul, 06974, Republic of Korea.
| | - Sangtaek Oh
- Department of Bio and Fermentation Convergence Technology, BK21 PLUS Program, Kookmin University, Seoul, 02707, Republic of Korea.
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Dupasquier S, Blache P, Picque Lasorsa L, Zhao H, Abraham JD, Haigh JJ, Ychou M, Prévostel C. Modulating PKCα Activity to Target Wnt/β-Catenin Signaling in Colon Cancer. Cancers (Basel) 2019; 11:cancers11050693. [PMID: 31109112 PMCID: PMC6563011 DOI: 10.3390/cancers11050693] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Revised: 05/15/2019] [Accepted: 05/16/2019] [Indexed: 12/20/2022] Open
Abstract
Inactivating mutations of the tumor suppressor Adenomatosis Polyposis Coli (APC), which are found in familial adenomatosis polyposis and in 80% of sporadic colorectal cancers (CRC), result in constitutive activation of the Wnt/β-catenin pathway and tumor development in the intestine. These mutations disconnect the Wnt/β-catenin pathway from its Wnt extracellular signal by inactivating the APC/GSK3-β/axin destruction complex of β-catenin. This results in sustained nuclear accumulation of β-catenin, followed by β-catenin-dependent co-transcriptional activation of Wnt/β-catenin target genes. Thus, mechanisms acting downstream of APC, such as those controlling β-catenin stability and/or co-transcriptional activity, are attractive targets for CRC treatment. Protein Kinase C-α (PKCα) phosphorylates the orphan receptor RORα that then inhibits β-catenin co-transcriptional activity. PKCα also phosphorylates β-catenin, leading to its degradation by the proteasome. Here, using both in vitro (DLD-1 cells) and in vivo (C57BL/6J mice) PKCα knock-in models, we investigated whether enhancing PKCα function could be beneficial in CRC treatment. We found that PKCα is infrequently mutated in CRC samples, and that inducing PKCα function is not deleterious for the normal intestinal epithelium. Conversely, di-terpene ester-induced PKCα activity triggers CRC cell death. Together, these data indicate that PKCα is a relevant drug target for CRC treatment.
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Affiliation(s)
| | - Philippe Blache
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
| | - Laurence Picque Lasorsa
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
| | - Han Zhao
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
| | - Jean-Daniel Abraham
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
| | - Jody J Haigh
- Research Institute in Oncology and Hematology, University of Manitoba, Winnipeg, MB R3E 0V9, Canada.
| | - Marc Ychou
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
| | - Corinne Prévostel
- Campus Val d'Aurelle-Research team "Integrative cancer research for personalized medicine in digestive oncology", IRCM U1194, University of Montpellier, ICM, CNRS, CHU, 34298 Montpellier, France.
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11
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Zhao L, Bartnikas T, Chu X, Klein J, Yun C, Srinivasan S, He P. Hyperglycemia promotes microvillus membrane expression of DMT1 in intestinal epithelial cells in a PKCα-dependent manner. FASEB J 2018; 33:3549-3561. [PMID: 30423260 DOI: 10.1096/fj.201801855r] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Excessive iron increases the incidence of diabetes and worsens diabetic complications. Reciprocally, diabetes induces iron loading, partially attributable to elevated intestinal iron export according to a recent report. Herein, we show that iron uptake and the mRNA expression of iron importer divalent metal transporter 1 (DMT1) were significantly increased in the duodenum of streptozotocin-induced diabetic mice. Immunofluorescence staining of human intestinal biopsies revealed increased brush border membrane (BBM) and decreased cytoplasmic DMT1 expression in patients with diabetes, suggesting translocation of DMT1. This pattern of DMT1 regulation was corroborated by immunoblotting results in diabetic mice showing that BBM DMT1 expression was increased by 210%, in contrast to a 60% increase in total DMT1. PKC mediates many diabetic complications, and PKCα activity was increased in diabetic mouse intestine. Intriguingly, diabetic mice with PKCα deficiency did not show increases in iron uptake and BBM DMT1 expression. High-glucose treatment increased plasma membrane DMT1 expression via the activation of PKCα in cultured IECs. Inhibition of PKCα potentiated the ubiquitination and degradation of DMT1 protein. We further showed that high glucose suppressed membrane DMT1 internalization. These findings demonstrate that PKCα promotes microvillus membrane DMT1 expression and intestinal iron uptake, contributing to diabetic iron loading.-Zhao, L., Bartnikas, T., Chu, X., Klein, J., Yun, C., Srinivasan, S., He, P. Hyperglycemia promotes microvillus membrane expression of DMT1 in intestinal epithelial cells in a PKCα-dependent manner.
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Affiliation(s)
- Luqing Zhao
- Department of Gastroenterology, Beijing Hospital of Traditional Chinese Medicine Affiliated With Capital Medical University, Beijing, China.,Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Thomas Bartnikas
- Department of Pathology and Laboratory Medicine, Brown University, Providence, Rhode Island, USA
| | - Xiangpeng Chu
- Department of Thoracic Surgery, People's Hospital of Rizhao, Shandong, China
| | - Janet Klein
- Division of Renal Medicine, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA; and
| | - Chris Yun
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta Veterans Administration Medical Center, Decatur, Georgia, USA
| | - Shanthi Srinivasan
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.,Atlanta Veterans Administration Medical Center, Decatur, Georgia, USA
| | - Peijian He
- Division of Digestive Diseases, Department of Medicine, Emory University School of Medicine, Atlanta, Georgia, USA
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12
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Tumor promoter TPA activates Wnt/β-catenin signaling in a casein kinase 1-dependent manner. Proc Natl Acad Sci U S A 2018; 115:E7522-E7531. [PMID: 30038030 PMCID: PMC6094128 DOI: 10.1073/pnas.1802422115] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
The phorbol ester 12-O-tetra-decanoylphorbol-13-acetate (TPA) is a well-known tumor promoter in two-stage mouse skin carcinogenesis, but the exact mechanism by which TPA promotes tumorigenesis remains elusive. This study discovered that TPA could stabilize CK1ε, enhance its kinase activity, and induce phosphorylation of LRP6, resulting in the formation of CK1ε–LRP6–axin1 complex, which may bypass the requirement of Wnt–Fzd–Dvl complex. TPA also increased the interaction between β-catenin and TCF4E in a CK1ε/δ-dependent way, and finally led to activation of the Wnt/β-catenin pathway. Our findings reveal a pathway by which TPA activates the Wnt/β-catenin signaling cascade. This pathway may represent a common mechanism for the tumor-promoting activity of some carcinogenic agents. The tumor promoter 12-O-tetra-decanoylphorbol-13-acetate (TPA) has been defined by its ability to promote tumorigenesis on carcinogen-initiated mouse skin. Activation of Wnt/β-catenin signaling has a decisive role in mouse skin carcinogenesis, but it remains unclear how TPA activates Wnt/β-catenin signaling in mouse skin carcinogenesis. Here, we found that TPA could enhance Wnt/β-catenin signaling in a casein kinase 1 (CK1) ε/δ-dependent manner. TPA stabilized CK1ε and enhanced its kinase activity. TPA further induced the phosphorylation of LRP6 at Thr1479 and Ser1490 and the formation of a CK1ε–LRP6–axin1 complex, leading to an increase in cytosolic β-catenin. Moreover, TPA increased the association of β-catenin with TCF4E in a CK1ε/δ-dependent way, resulting in the activation of Wnt target genes. Consistently, treatment with a selective CK1ε/δ inhibitor SR3029 suppressed TPA-induced skin tumor formation in vivo, probably through blocking Wnt/β-catenin signaling. Taken together, our study has identified a pathway by which TPA activates Wnt/β-catenin signaling.
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13
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Cheng Y, Zhu Y, Xu W, Xu J, Yang M, Chen P, Zhao J, Geng L, Gong S. PKCα in colon cancer cells promotes M1 macrophage polarization via MKK3/6-P38 MAPK pathway. Mol Carcinog 2018; 57:1017-1029. [PMID: 29637628 DOI: 10.1002/mc.22822] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 03/17/2018] [Accepted: 04/04/2018] [Indexed: 01/19/2023]
Abstract
Tumor associated macrophages are potential targets of the immune therapy for patients with colon cancer. PKCα acts as a tumor suppressor in the intestine. However, the correlation between PKCα expressed in colon cancer cells and tumor associated macrophages polarization has never been detected. In the present study, the correlation between PKCα expression and level of M1 macrophages was evaluated in human colon cancer tissues. A xenograft mouse model of colon cancer cells with different PKCα expression level was constructed to evaluate the effect of PKCα on M1 macrophages polarization in vivo. Co-culture of colon cancer cells and differentiated macrophages was used to detect the potential interplay in vitro. PKCα regulated production of cytokines which correlated with macrophage polarization and the underlying mechanism was further explored. Our study showed that high PKCα expression in human colon cancer tissues correlated with better prognosis and high M1 macrophage content. PKCα expressed in colon cancer cells inhibited the growth of colon cancer in mice model. PKCα induced macrophages polarized to the M1-like phenotype both in vitro and in vivo. Mechanistically, PKCα targeted P38 via MKK3/6 to promote IL12 and GM-CSF expression which further enhanced M1-like macrophages polarization. In conclusion, this study provided evidence for the first time that PKCα in colon cancer cells play an anticancer action by inducing the polarization of tumor associated macrophages to M1-like phenotype in the tumor microenvironment. PKCα promoted IL12/GM-CSF-mediated M1 polarization through MKK3/6-P38 signaling pathway. Our investigation suggested that modulation of the PKCα signaling pathway might serve as a novel strategy for colon cancer therapy.
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Affiliation(s)
- Yang Cheng
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China.,Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Yun Zhu
- Liver Tumor Center, Department of Infectious Diseases and Hepatology Unit, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Wanfu Xu
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China.,Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Jiajia Xu
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China.,Guangzhou Institute of Pediatrics, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Min Yang
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Peiyu Chen
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Junhong Zhao
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Lanlan Geng
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
| | - Sitang Gong
- Department of Digestive, Guangzhou Women and Children's Medical Center, Guangzhou Medical University, Guangzhou, Guangdong, China
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14
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Dowling CM, Phelan J, Callender JA, Cathcart MC, Mehigan B, McCormick P, Dalton T, Coffey JC, Newton AC, O'Sullivan J, Kiely PA. Protein kinase C beta II suppresses colorectal cancer by regulating IGF-1 mediated cell survival. Oncotarget 2018; 7:20919-33. [PMID: 26989024 PMCID: PMC4991501 DOI: 10.18632/oncotarget.8062] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Accepted: 01/31/2016] [Indexed: 12/11/2022] Open
Abstract
Despite extensive efforts, cancer therapies directed at the Protein Kinase C (PKC) family of serine/threonine kinases have failed in clinical trials. These therapies have been directed at inhibiting PKC and have, in some cases, worsened disease outcome. Here we examine colon cancer patients and show not only that PKC Beta II is a tumour suppressor, but patients with low levels of this isozyme have significantly decreased disease free survival. Specifically, analysis of gene expression levels of all PKC genes in matched normal and cancer tissue samples from colon cancer patients revealed a striking down-regulation of the gene coding PKC Beta in the cancer tissue (n = 21). Tissue microarray analysis revealed a dramatic down-regulation of PKC Beta II protein levels in both the epithelial and stromal diseased tissue (n = 166). Of clinical significance, low levels of the protein in the normal tissue of patients is associated with a low (10%) 10 year survival compared with a much higher (60%) survival in patients with relatively high levels of the protein. Consistent with PKC Beta II levels protecting against colon cancer, overexpression of PKC Beta II in colon cancer cell lines reveals that PKC Beta II reverses transformation in cell based assays. Further to this, activation of PKC Beta II results in a dramatic downregulation of IGF-I-induced AKT, indicating a role for PKCs in regulating IGF-1 mediated cell survival. Thus, PKC Beta II is a tumour suppressor in colon cancer and low levels serve as a predictor for poor survival outcome.
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Affiliation(s)
- Catríona M Dowling
- Graduate Entry Medical School and Health Research Institute (HRI), University of Limerick, Limerick, Ireland.,Department of Life Sciences, and Materials and Surface Science Institute, University of Limerick, Limerick, Ireland.,Stokes Research Institute, University of Limerick, Limerick, Ireland
| | - James Phelan
- Department of Surgery, Trinity College Dublin, Dublin, Ireland
| | - Julia A Callender
- Department of Pharmacology, University of California at San Diego, La Jolla, CA, USA
| | | | | | | | - Tara Dalton
- Stokes Research Institute, University of Limerick, Limerick, Ireland
| | - John C Coffey
- 4i Centre for Interventions in Infection, Inflammation and Immunity, Graduate Entry Medical School, University of Limerick, Limerick, Ireland
| | - Alexandra C Newton
- Department of Pharmacology, University of California at San Diego, La Jolla, CA, USA
| | | | - Patrick A Kiely
- Graduate Entry Medical School and Health Research Institute (HRI), University of Limerick, Limerick, Ireland.,Department of Life Sciences, and Materials and Surface Science Institute, University of Limerick, Limerick, Ireland.,Stokes Research Institute, University of Limerick, Limerick, Ireland
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15
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Dowling CM, Hayes SL, Phelan JJ, Cathcart MC, Finn SP, Mehigan B, McCormick P, Coffey JC, O'sullivan J, Kiely PA. Expression of protein kinase C gamma promotes cell migration in colon cancer. Oncotarget 2017; 8:72096-72107. [PMID: 29069771 PMCID: PMC5641114 DOI: 10.18632/oncotarget.18916] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Accepted: 06/13/2017] [Indexed: 12/24/2022] Open
Abstract
Despite extensive efforts, Protein Kinase Cs (PKCs) have proven to be an intractable target in cancer therapies. Traditionally it was accepted that PKCs act as tumour promoters, however new research suggests that PKCs may play an important role in the suppression of cancer. A challenge in targeting PKCs is the limited data available in patient samples. One of the PKC isozymes, PKC gamma, is thought to be present only in the brain and has been largely neglected in the context of cancer. Analysis of gene expression levels of PKC gamma in patient matched normal and colon cancer tissue samples revealed an up-regulation of the gene in the cancer tissue of 54% of the patients examined. Mechanistically we demonstrate that a reduction in the levels of PKC gamma in the colon cancer cells inhibits cell migration and foci formation. Further to this, we observe an increase in cell adhesion and proliferation following the reduction of PKC gamma levels in the cell. Thus, PKC gamma plays a key role in colon cancer; making it an important isozyme that needs to be reconsidered in the context of cancer therapies.
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Affiliation(s)
- Catríona M Dowling
- Graduate Entry Medical School, University of Limerick, Limerick, Ireland.,Health Research Institute University of Limerick, Limerick, Ireland
| | - Sheri L Hayes
- Graduate Entry Medical School, University of Limerick, Limerick, Ireland.,Health Research Institute University of Limerick, Limerick, Ireland
| | - James J Phelan
- Trinity Translational Medicine Institute, Department of Surgery, Trinity College Dublin, St. James's Hospital, Dublin, Ireland
| | - Mary Clare Cathcart
- Trinity Translational Medicine Institute, Department of Surgery, Trinity College Dublin, St. James's Hospital, Dublin, Ireland
| | - Stephen P Finn
- Department of Histopathology, St James's Hospital, Trinity College Dublin, Ireland
| | | | | | - John C Coffey
- Graduate Entry Medical School, University of Limerick, Limerick, Ireland
| | - Jacintha O'sullivan
- Trinity Translational Medicine Institute, Department of Surgery, Trinity College Dublin, St. James's Hospital, Dublin, Ireland
| | - Patrick A Kiely
- Graduate Entry Medical School, University of Limerick, Limerick, Ireland.,Health Research Institute University of Limerick, Limerick, Ireland
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16
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Isakov N. Protein kinase C (PKC) isoforms in cancer, tumor promotion and tumor suppression. Semin Cancer Biol 2017; 48:36-52. [PMID: 28571764 DOI: 10.1016/j.semcancer.2017.04.012] [Citation(s) in RCA: 162] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 03/22/2017] [Accepted: 04/25/2017] [Indexed: 12/27/2022]
Abstract
The AGC family of serine/threonine kinases (PKA, PKG, PKC) includes more than 60 members that are critical regulators of numerous cellular functions, including cell cycle and differentiation, morphogenesis, and cell survival and death. Mutation and/or dysregulation of AGC kinases can lead to malignant cell transformation and contribute to the pathogenesis of many human diseases. Members of one subgroup of AGC kinases, the protein kinase C (PKC), have been singled out as critical players in carcinogenesis, following their identification as the intracellular receptors of phorbol esters, which exhibit tumor-promoting activities. This observation attracted the attention of researchers worldwide and led to intense investigations on the role of PKC in cell transformation and the potential use of PKC as therapeutic drug targets in cancer diseases. Studies demonstrated that many cancers had altered expression and/or mutation of specific PKC genes. However, the causal relationships between the changes in PKC gene expression and/or mutation and the direct cause of cancer remain elusive. Independent studies in normal cells demonstrated that activation of PKC is essential for the induction of cell activation and proliferation, differentiation, motility, and survival. Based on these observations and the general assumption that PKC isoforms play a positive role in cell transformation and/or cancer progression, many PKC inhibitors have entered clinical trials but the numerous attempts to target PKC in cancer has so far yielded only very limited success. More recent studies demonstrated that PKC function as tumor suppressors, and suggested that future clinical efforts should focus on restoring, rather than inhibiting, PKC activity. The present manuscript provides some historical perspectives on the tumor promoting function of PKC, reviewing some of the observations linking PKC to cancer progression, and discusses the role of PKC in the pathogenesis of cancer diseases and its potential usage as a therapeutic target.
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Affiliation(s)
- Noah Isakov
- The Shraga Segal Department of Microbiology, Immunology and Genetics, Faculty of Health Sciences and the Cancer Research Center, Ben Gurion University of the Negev, P.O.B. 653, Beer Sheva 84105, Israel.
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17
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Duong M, Yu X, Teng B, Schroder P, Haller H, Eschenburg S, Schiffer M. Protein kinase C ϵ stabilizes β-catenin and regulates its subcellular localization in podocytes. J Biol Chem 2017; 292:12100-12110. [PMID: 28539358 DOI: 10.1074/jbc.m117.775700] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 05/23/2017] [Indexed: 01/18/2023] Open
Abstract
Kidney disease has been linked to dysregulated signaling via PKC in kidney cells such as podocytes. PKCα is a conventional isoform of PKC and a well-known binding partner of β-catenin, which promotes its degradation. β-Catenin is the main effector of the canonical Wnt pathway and is critical in cell adhesion. However, whether other PKC isoforms interact with β-catenin has not been studied systematically. Here we demonstrate that PKCϵ-deficient mice, which develop proteinuria and glomerulosclerosis, display lower β-catenin expression compared with PKC wild-type mice, consistent with an altered phenotype of podocytes in culture. Remarkably, β-catenin showed a reversed subcellular localization pattern: Although β-catenin exhibited a perinuclear pattern in undifferentiated wild-type cells, it predominantly localized to the nucleus in PKCϵ knockout cells. Phorbol 12-myristate 13-acetate stimulation of both cell types revealed that PKCϵ positively regulates β-catenin expression and stabilization in a glycogen synthase kinase 3β-independent manner. Further, β-catenin overexpression in PKCϵ-deficient podocytes could restore the wild-type phenotype, similar to rescue with a PKCϵ construct. This effect was mediated by up-regulation of P-cadherin and the β-catenin downstream target fascin1. Zebrafish studies indicated three PKCϵ-specific phosphorylation sites in β-catenin that are required for full β-catenin function. Co-immunoprecipitation and pulldown assays confirmed PKCϵ and β-catenin as binding partners and revealed that ablation of the three PKCϵ phosphorylation sites weakens their interaction. In summary, we identified a novel pathway for regulation of β-catenin levels and define PKCϵ as an important β-catenin interaction partner and signaling opponent of other PKC isoforms in podocytes.
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Affiliation(s)
- Michelle Duong
- Department of Hypertension and Nephrology, Hanover Medical School, 30625 Hanover, Germany
| | - Xuejiao Yu
- Department of Hypertension and Nephrology, Hanover Medical School, 30625 Hanover, Germany
| | - Beina Teng
- Department of Hypertension and Nephrology, Hanover Medical School, 30625 Hanover, Germany
| | - Patricia Schroder
- Mount Desert Island Biological Laboratory, Salisbury Cove, Maine 04672
| | - Hermann Haller
- Department of Hypertension and Nephrology, Hanover Medical School, 30625 Hanover, Germany
| | - Susanne Eschenburg
- Institute for Biophysical Chemistry, Hanover Medical School, 30625 Hanover, Germany
| | - Mario Schiffer
- Department of Hypertension and Nephrology, Hanover Medical School, 30625 Hanover, Germany.
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18
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Chen S, Wang Y, Zhang Y, Wan Y. Low expression of PKCα and high expression of KRAS predict poor prognosis in patients with colorectal cancer. Oncol Lett 2016; 12:1655-1660. [PMID: 27602102 PMCID: PMC4998155 DOI: 10.3892/ol.2016.4845] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 03/08/2016] [Indexed: 01/13/2023] Open
Abstract
The current study aimed to determine the association between protein kinase Cα (PKCα) and Kirsten rat sarcoma viral oncogene homolog (KRAS) expression and the response to folinic acid, 5-fluorouracil and oxaliplatin (FOLFOX regimen) in patients with colorectal cancer (CRC). The protein levels of PKCα and KRAS were analyzed by immunohistochemistry in tissue samples from patients with CRC and in non-cancerous tissues, including 152 cases of colorectal adenocarcinoma, 30 cases of colorectal adenoma and 20 normal colonic mucosa samples. The association between PKCα and KRAS expression and clinicopathological features was analyzed. The rates of positive PKCα protein expression in patients with poorly, moderately and well-differentiated adenocarcinoma were 16.7% (6/36), 40.0% (24/60), and 57.1% (32/56), respectively (P<0.013). The rate of positive KRAS expression in CRC patients was significantly higher than in patients with colon adenoma and normal colon mucosa (P<0.001). Expression levels of KRAS were associated with the degree of differentiation of CRC (P<0.001). Expression of PKCα was negatively correlated with KRAS expression in CRC tissues. The mean progression-free survival (PFS) times in patients with high and low expression of PKCα were 43.9 and 38.8 months, respectively (P<0.001). The mean PFS times were 38.5 and 45.5 months in patients with high and low expression of KRAS, respectively (P=0.001). In conclusion, low PKCα and high KRAS expression predicted relatively poor prognosis in patients with CRC.
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Affiliation(s)
- Suxian Chen
- Department of Pathology, The Third Affiliated Hospital of Liaoning Medical College, Jinzhou, Liaoning 121002, P.R. China
| | - Yadi Wang
- Department of Oncology, The Third Affiliated Hospital of Liaoning Medical College, Jinzhou, Liaoning 121002, P.R. China
| | - Yun Zhang
- Department of Obstetrics and Gynecology, The Third Affiliated Hospital of Liaoning Medical College, Jinzhou, Liaoning 121002, P.R. China
| | - Yizeng Wan
- Department of Pathology, The Third Affiliated Hospital of Liaoning Medical College, Jinzhou, Liaoning 121002, P.R. China
- Correspondence to: Dr Yizeng Wan, Department of Pathology, The Third Affiliated Hospital of Liaoning Medical College, 2 Heping Road Section 5, Linghe, Jinzhou, Liaoning 121002, P.R. China, E-mail:
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19
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Yang C, Du W, Yang D. Inhibition of green tea polyphenol EGCG((-)-epigallocatechin-3-gallate) on the proliferation of gastric cancer cells by suppressing canonical wnt/β-catenin signalling pathway. Int J Food Sci Nutr 2016; 67:818-27. [PMID: 27338284 DOI: 10.1080/09637486.2016.1198892] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
(-)-Epigallocatechin-3-gallate (EGCG), the major polyphenol in green tea, could affect carcinogenesis and development of many cancers. However, the effects and underlying mechanisms of EGCG on gastric cancer remain unclear. We found that EGCG significantly inhibited proliferation and increased apoptosis of SGC-7901 cells in vitro. The decreased expressions of p-β-catenin(Ser552), p-GSK3β(S9) and β-catenin target genes were detected in SGC-7901 cells after treated by EGCG. XAV939 and β-catenin plasmid were further used to demonstrate the inhibition of EGCG on canonical Wnt/β-catenin signalling. Moreover, EGCG significantly inhibited gastric tumour growth in vivo by inhibiting Wnt/β-catenin signalling. Taken together, our findings establish that EGCG suppressed gastric cancer cell proliferation and demonstrate that this inhibitory effect is related to canonical Wnt/β-catenin signalling. This study raises a new insight into gastric cancer prevention and therapy, and provides evidence that green tea could be used as a nutraceutical beverage.
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Affiliation(s)
- Chenggang Yang
- a Department of Gastrointestinal Surgery , Liaocheng People's Hospital , Liaocheng , Shandong , China
| | - Wenfeng Du
- a Department of Gastrointestinal Surgery , Liaocheng People's Hospital , Liaocheng , Shandong , China
| | - Daogui Yang
- a Department of Gastrointestinal Surgery , Liaocheng People's Hospital , Liaocheng , Shandong , China
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20
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Antal CE, Hudson AM, Kang E, Zanca C, Wirth C, Stephenson NL, Trotter EW, Gallegos LL, Miller CJ, Furnari FB, Hunter T, Brognard J, Newton AC. Cancer-associated protein kinase C mutations reveal kinase's role as tumor suppressor. Cell 2015; 160:489-502. [PMID: 25619690 PMCID: PMC4313737 DOI: 10.1016/j.cell.2015.01.001] [Citation(s) in RCA: 247] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Revised: 11/12/2014] [Accepted: 12/24/2014] [Indexed: 12/24/2022]
Abstract
Protein kinase C (PKC) isozymes have remained elusive cancer targets despite the unambiguous tumor promoting function of their potent ligands, phorbol esters, and the prevalence of their mutations. We analyzed 8% of PKC mutations identified in human cancers and found that, surprisingly, most were loss of function and none were activating. Loss-of-function mutations occurred in all PKC subgroups and impeded second-messenger binding, phosphorylation, or catalysis. Correction of a loss-of-function PKCβ mutation by CRISPR-mediated genome editing in a patient-derived colon cancer cell line suppressed anchorage-independent growth and reduced tumor growth in a xenograft model. Hemizygous deletion promoted anchorage-independent growth, revealing that PKCβ is haploinsufficient for tumor suppression. Several mutations were dominant negative, suppressing global PKC signaling output, and bioinformatic analysis suggested that PKC mutations cooperate with co-occurring mutations in cancer drivers. These data establish that PKC isozymes generally function as tumor suppressors, indicating that therapies should focus on restoring, not inhibiting, PKC activity.
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Affiliation(s)
- Corina E Antal
- Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA; Biomedical Sciences Graduate Program, University of California at San Diego, La Jolla, CA 92093, USA
| | - Andrew M Hudson
- Signalling Networks in Cancer Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK
| | - Emily Kang
- Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA
| | - Ciro Zanca
- Ludwig Institute for Cancer Research, University of California at San Diego, La Jolla, CA 92093, USA
| | - Christopher Wirth
- Applied Computational Biology and Bioinformatics Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK
| | - Natalie L Stephenson
- Signalling Networks in Cancer Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK
| | - Eleanor W Trotter
- Signalling Networks in Cancer Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK
| | - Lisa L Gallegos
- Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA; Biomedical Sciences Graduate Program, University of California at San Diego, La Jolla, CA 92093, USA
| | - Crispin J Miller
- Applied Computational Biology and Bioinformatics Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK
| | - Frank B Furnari
- Ludwig Institute for Cancer Research, University of California at San Diego, La Jolla, CA 92093, USA
| | | | - John Brognard
- Signalling Networks in Cancer Group, Cancer Research UK Manchester Institute, University of Manchester, Manchester M20 4BX, UK.
| | - Alexandra C Newton
- Department of Pharmacology, University of California at San Diego, La Jolla, CA 92093, USA.
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21
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Garg R, Benedetti LG, Abera MB, Wang H, Abba M, Kazanietz MG. Protein kinase C and cancer: what we know and what we do not. Oncogene 2014; 33:5225-37. [PMID: 24336328 DOI: 10.1038/onc.2013.524] [Citation(s) in RCA: 197] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 10/20/2013] [Accepted: 10/20/2013] [Indexed: 02/08/2023]
Abstract
Since their discovery in the late 1970s, protein kinase C (PKC) isozymes represent one of the most extensively studied signaling kinases. PKCs signal through multiple pathways and control the expression of genes relevant for cell cycle progression, tumorigenesis and metastatic dissemination. Despite the vast amount of information concerning the mechanisms that control PKC activation and function in cellular models, the relevance of individual PKC isozymes in the progression of human cancer is still a matter of controversy. Although the expression of PKC isozymes is altered in multiple cancer types, the causal relationship between such changes and the initiation and progression of the disease remains poorly defined. Animal models developed in the last years helped to better understand the involvement of individual PKCs in various cancer types and in the context of specific oncogenic alterations. Unraveling the enormous complexity in the mechanisms by which PKC isozymes have an impact on tumorigenesis and metastasis is key for reassessing their potential as pharmacological targets for cancer treatment.
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Affiliation(s)
- R Garg
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - L G Benedetti
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - M B Abera
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - H Wang
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - M Abba
- Centro de Investigaciones Inmunológicas Básicas y Aplicadas (CINIBA), Facultad de Ciencias Médicas, Universidad Nacional de La Plata, La Plata, Argentina
| | - M G Kazanietz
- Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
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22
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Oh S, Gwak J, Park S, Yang CS. Green tea polyphenol EGCG suppresses Wnt/β-catenin signaling by promoting GSK-3β- and PP2A-independent β-catenin phosphorylation/degradation. Biofactors 2014; 40:586-95. [PMID: 25352148 PMCID: PMC4285564 DOI: 10.1002/biof.1185] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/09/2014] [Accepted: 09/25/2014] [Indexed: 12/16/2022]
Abstract
(-)-Epigallocatechin-3-gallate (EGCG), the major polyphenol in green tea, has been reported to inhibit the Wnt/β-catenin pathway, which is aberrantly up-regulated in colorectal cancers, but its precise mechanism of action remains unclear. Here, we used a sensitive cell-based system to demonstrate that EGCG suppresses β-catenin response transcription (CRT), activated by Wnt3a-conditioned medium (Wnt3a-CM), by promoting the degradation of intracellular β-catenin. EGCG induced β-catenin N-terminal phosphorylation at the Ser33/37 residues and subsequently promoted its degradation; however, this effect was not observed for oncogenic forms of β-catenin. Pharmacological inhibition or depletion of glycogen synthase kinase-3β (GSK-3β) did not abrogate the EGCG-mediated β-catenin degradation. EGCG did not affect the activity and expression of protein phosphatase 2A (PP2A). Consistently, the phosphorylation and degradation of β-catenin was found in adenomatous polyposis coli (APC) mutated colon cancer cells after EGCG treatment. EGCG repressed the expression of cyclin D1 and c-myc, which are β-catenin/T-cell factor-dependent genes, and inhibited the proliferation of colon cancer cells. Our findings suggest that EGCG exerts its cancer-preventive or anticancer activity against colon cancer cells by promoting the phosphorylation and proteasomal degradation of β-catenin through a mechanism independent of the GSK-3β and PP2A.
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Affiliation(s)
- Sangtaek Oh
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
- Address for correspondence to: Sangtaek Oh, Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea. Tel: +82-2-910 5732; Fax: +82-2-910-5739; or Chung S. Yang. Department of Chemical Biology, Ernest Mario School of Pharmacy at Rutgers, The State University of New Jersey, Piscataway, NJ08904, USA. Tel: +1-732-445-5360 Fax: +1-732-445-0687,
| | - Jungsug Gwak
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
- Research Institute for Basic Science, Sogang University, Seoul 121-742, Republic of Korea
| | - Seoyoung Park
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
| | - Chung S. Yang
- Department of Chemical Biology, Ernest Mario School of Pharmacy at Rutgers, The State University of New Jersey, Piscataway, NJ08904, USA
- Address for correspondence to: Sangtaek Oh, Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea. Tel: +82-2-910 5732; Fax: +82-2-910-5739; or Chung S. Yang. Department of Chemical Biology, Ernest Mario School of Pharmacy at Rutgers, The State University of New Jersey, Piscataway, NJ08904, USA. Tel: +1-732-445-5360 Fax: +1-732-445-0687,
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23
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Zhang HT, Zhang D, Zha ZG, Hu CD. Transcriptional activation of PRMT5 by NF-Y is required for cell growth and negatively regulated by the PKC/c-Fos signaling in prostate cancer cells. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2014; 1839:1330-40. [PMID: 25281873 DOI: 10.1016/j.bbagrm.2014.09.015] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 08/05/2014] [Revised: 09/17/2014] [Accepted: 09/24/2014] [Indexed: 01/11/2023]
Abstract
Protein arginine methyltransferase 5 (PRMT5) symmetrically methylates arginine residues of histones and non-histone protein substrates and regulates a variety of cellular processes through epigenetic control of target gene expression or post-translational modification of signaling molecules. Recent evidence suggests that PRMT5 may function as an oncogene and its overexpression contributes to the development and progression of several human cancers. However, the mechanism underlying the regulation of PRMT5 expression in cancer cells remains largely unknown. In the present study, we have mapped the proximal promoter of PRMT5 to the -240bp region and identified nuclear transcription factor Y (NF-Y) as a critical transcription factor that binds to the two inverted CCAAT boxes and regulates PRMT5 expression in multiple cancer cell lines. Further, we present evidence that loss of PRMT5 is responsible for cell growth inhibition induced by knockdown of NF-YA, a subunit of NF-Y that forms a heterotrimeric complex with NF-YB and NF-YC for function. Significantly, we have found that activation of protein kinase C (PKC) by phorbol 12-myristate 13-acetate (PMA) in LNCaP prostate cancer cells down-regulates the expression of NF-YA and PRMT5 at the transcription level in a c-Fos-dependent manner. Given that down-regulation of several PKC isozymes is implicated in the development and progression of several human cancers, our findings suggest that the PKC-c-Fos-NF-Y signaling pathway may be responsible for PRMT5 overexpression in a subset of human cancer patients.
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Affiliation(s)
- Huan-Tian Zhang
- Department of Medicinal Chemistry and Molecular Pharmacology and the Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA; Institute of Orthopedic Diseases and Department of Orthopedics of the First Affiliated Hospital, Jinan University, Guangzhou 510630, People's Republic of China
| | - Dabao Zhang
- Department of Statistics, Purdue University, West Lafayette, IN 47907, USA
| | - Zhen-Gang Zha
- Department of Medicinal Chemistry and Molecular Pharmacology and the Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA
| | - Chang-Deng Hu
- Department of Medicinal Chemistry and Molecular Pharmacology and the Purdue University Center for Cancer Research, Purdue University, West Lafayette, IN 47907, USA.
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24
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Interaction of PKCα with the armadillo repeats facilitates the N-terminal phosphorylation of β-catenin. Biochem Biophys Res Commun 2014; 450:1673-8. [DOI: 10.1016/j.bbrc.2014.07.066] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Accepted: 07/14/2014] [Indexed: 11/20/2022]
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25
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Galea GL, Meakin LB, Williams CM, Hulin-Curtis SL, Lanyon LE, Poole AW, Price JS. Protein kinase Cα (PKCα) regulates bone architecture and osteoblast activity. J Biol Chem 2014; 289:25509-22. [PMID: 25070889 PMCID: PMC4162157 DOI: 10.1074/jbc.m114.580365] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Bones' strength is achieved and maintained through adaptation to load bearing. The role of the protein kinase PKCα in this process has not been previously reported. However, we observed a phenotype in the long bones of Prkca−/− female but not male mice, in which bone tissue progressively invades the medullary cavity in the mid-diaphysis. This bone deposition progresses with age and is prevented by disuse but unaffected by ovariectomy. Castration of male Prkca−/− but not WT mice results in the formation of small amounts of intramedullary bone. Osteoblast differentiation markers and Wnt target gene expression were up-regulated in osteoblast-like cells derived from cortical bone of female Prkca−/− mice compared with WT. Additionally, although osteoblastic cells derived from WT proliferate following exposure to estradiol or mechanical strain, those from Prkca−/− mice do not. Female Prkca−/− mice develop splenomegaly and reduced marrow GBA1 expression reminiscent of Gaucher disease, in which PKC involvement has been suggested previously. From these data, we infer that in female mice, PKCα normally serves to prevent endosteal bone formation stimulated by load bearing. This phenotype appears to be suppressed by testicular hormones in male Prkca−/− mice. Within osteoblastic cells, PKCα enhances proliferation and suppresses differentiation, and this regulation involves the Wnt pathway. These findings implicate PKCα as a target gene for therapeutic approaches in low bone mass conditions.
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Affiliation(s)
- Gabriel L Galea
- From the School of Veterinary Sciences, University of Bristol, Bristol BS2 8EJ, United Kingdom and
| | - Lee B Meakin
- From the School of Veterinary Sciences, University of Bristol, Bristol BS2 8EJ, United Kingdom and
| | - Christopher M Williams
- the School of Physiology and Pharmacology, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Sarah L Hulin-Curtis
- From the School of Veterinary Sciences, University of Bristol, Bristol BS2 8EJ, United Kingdom and
| | - Lance E Lanyon
- From the School of Veterinary Sciences, University of Bristol, Bristol BS2 8EJ, United Kingdom and
| | - Alastair W Poole
- the School of Physiology and Pharmacology, University of Bristol, Bristol BS8 1TD, United Kingdom
| | - Joanna S Price
- From the School of Veterinary Sciences, University of Bristol, Bristol BS2 8EJ, United Kingdom and
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26
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Kim JH, Kim YH, Song GY, Kim DE, Jeong YJ, Liu KH, Chung YH, Oh S. Ursolic acid and its natural derivative corosolic acid suppress the proliferation of APC-mutated colon cancer cells through promotion of β-catenin degradation. Food Chem Toxicol 2014; 67:87-95. [PMID: 24566423 DOI: 10.1016/j.fct.2014.02.019] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 02/03/2014] [Accepted: 02/17/2014] [Indexed: 10/25/2022]
Abstract
Ursolic acid (UA) and corosolic acid (CA), naturally occurring pentacyclic triterpene acids, exhibit antiproliferative activities against various cancer cells, but a clear chemopreventive mechanism of these triterpenoids in colon cancer cells remains to be answered. Here we used a cell-based reporter system for detection of β-catenin response transcription (CRT) to identify UA as an antagonist of the Wnt/β-catenin pathway. UA promoted the degradation of intracellular β-catenin that was accompanied by its N-terminal phosphorylation at Ser33/37/Thr41 residues, marking it for proteasomal degradation. Consistently, UA down-regulated the intracellular β-catenin level in colon cancer cells with inactivating mutations of adenomatous polyposis coli (APC). In addition, UA repressed the expression of β-catenin/T-cell factor (TCF)-dependent genes, thereby inhibiting cell proliferation in colon cancer cells. The functional group analysis revealed that the major structural requirements for UA-mediated β-catenin degradation are a carboxyl group at position 17 and a methyl group at position 19. Notably, CA (2α-hydroxyursolic acid) was also found to decrease the level of intracellular β-catenin and to suppress the growth of APC-mutated colon cancer cells. Our findings suggest that UA and CA exert their anticancer activities against colon cancer cells by promoting the N-terminal phosphorylation and subsequent proteasomal degradation of β-catenin.
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Affiliation(s)
- Joo-Hyun Kim
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea
| | - Young Ho Kim
- College of Pharmacy, Chungnam National University, Daejeon 305-764, Republic of Korea
| | - Gyu-Yong Song
- College of Pharmacy, Chungnam National University, Daejeon 305-764, Republic of Korea
| | - Dong-Eun Kim
- Department of Bioscience and Biotechnology, Konkuk University, Seoul 143-701, Republic of Korea
| | - Yong-Joo Jeong
- Department of Bio and Nanochemistry, Kookmin University, Seoul 136-702, Republic of Korea
| | - Kwang-Hyeon Liu
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Kyungpook National University, Daegu 702-701, Republic of Korea
| | - Young-Hwa Chung
- BK21+, Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Republic of Korea
| | - Sangtaek Oh
- Department of Bio and Fermentation Convergence Technology, Kookmin University, Seoul 136-702, Republic of Korea.
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27
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Wang L, Li H, Yang S. Role of oxygen free radicals in the proliferation of myofibroblasts induced by AngII. Acta Pharm Sin B 2013. [DOI: 10.1016/j.apsb.2012.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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28
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Wang BS, Yang Y, Lu HZ, Shang L, Zhang Y, Hao JJ, Shi ZZ, Wang XM, Liu YZ, Zhan QM, Jia XM, Wang MR. Inhibition of atypical protein kinase Cι induces apoptosis through autophagic degradation of β-catenin in esophageal cancer cells. Mol Carcinog 2013; 53:514-25. [PMID: 23359356 DOI: 10.1002/mc.22003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Accepted: 12/19/2012] [Indexed: 12/21/2022]
Abstract
Atypical protein kinase Cι (PKCι) has been identified as an oncoprotein in esophageal squamous cell carcinomas. However, the mechanisms underlying the role of PKCι in this disease remain unclear. In the present work, we found that inhibition of PKCι expression by RNAi induced apoptosis via the down-regulation of β-catenin in esophageal cancer cells. Furthermore, we found that PKCι regulated β-catenin in an autophagy dependent way. Since down-regulation of β-catenin induced by knockdown of PKCι could be rescued by autophagy inhibition; knockdown of PKCι activated autophagy and promoted the recruitment of β-catenin into autophagosome. These results suggested that PKCι positively regulated β-catenin through negatively regulated autophagy and depletion of PKCι promoted apoptosis via autophagic degradation of β-catenin in esophageal cancer cells. These data provide new insights into PKCι signaling in human cancer.
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Affiliation(s)
- Bo-Shi Wang
- State Key Laboratory of Molecular Oncology, Cancer Institute (Hospital), Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China
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29
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Terés S, Lladó V, Higuera M, Barceló-Coblijn G, Martin ML, Noguera-Salvà MA, Marcilla-Etxenike A, García-Verdugo JM, Soriano-Navarro M, Saus C, Gómez-Pinedo U, Busquets X, Escribá PV. 2-Hydroxyoleate, a nontoxic membrane binding anticancer drug, induces glioma cell differentiation and autophagy. Proc Natl Acad Sci U S A 2012; 109:8489-94. [PMID: 22586083 PMCID: PMC3365159 DOI: 10.1073/pnas.1118349109] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Despite recent advances in the development of new cancer therapies, the treatment options for glioma remain limited, and the survival rate of patients has changed little over the past three decades. Here, we show that 2-hydroxyoleic acid (2OHOA) induces differentiation and autophagy of human glioma cells. Compared to the current reference drug for this condition, temozolomide (TMZ), 2OHOA combated glioma more efficiently and, unlike TMZ, tumor relapse was not observed following 2OHOA treatment. The novel mechanism of action of 2OHOA is associated with important changes in membrane-lipid composition, primarily a recovery of sphingomyelin (SM) levels, which is markedly low in glioma cells before treatment. Parallel to membrane-lipid regulation, treatment with 2OHOA induced a dramatic translocation of Ras from the membrane to the cytoplasm, which inhibited the MAP kinase pathway, reduced activity of the PI3K/Akt pathway, and downregulated Cyclin D-CDK4/6 proteins followed by hypophosphorylation of the retinoblastoma protein (RB). These regulatory effects were associated with induction of glioma cell differentiation into mature glial cells followed by autophagic cell death. Given its high efficacy, low toxicity, ease of oral administration, and good distribution to the brain, 2OHOA constitutes a new and potentially valuable therapeutic tool for glioma patients.
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Affiliation(s)
- Silvia Terés
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Victoria Lladó
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Mónica Higuera
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Gwendolyn Barceló-Coblijn
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Maria Laura Martin
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Maria Antònia Noguera-Salvà
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Amaia Marcilla-Etxenike
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - José Manuel García-Verdugo
- Laboratorio de Morfología Celular, Unidad Mixta Centro de Investigación Príncipe Felipe-Universitat de València Estudi General, Centro de Investigación Biomédica en Red, Enfermedades Neurodegenerativas, 46013 Valencia, Spain; and
| | - Mario Soriano-Navarro
- Laboratorio de Morfología Celular, Unidad Mixta Centro de Investigación Príncipe Felipe-Universitat de València Estudi General, Centro de Investigación Biomédica en Red, Enfermedades Neurodegenerativas, 46013 Valencia, Spain; and
| | - Carlos Saus
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Ulises Gómez-Pinedo
- Laboratory of Regenerative Medicine, Neuroscience Institute, Hospital Clínico San Carlos, 28040 Madrid, Spain
| | - Xavier Busquets
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
| | - Pablo V. Escribá
- Molecular Cell Biomedicine, Department of Biology-Institut Universitari d’Investigacions en Ciències de la Salut, University of the Balearic Islands, 07122 Palma de Mallorca, Spain
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Sphingomyelin and sphingomyelin synthase (SMS) in the malignant transformation of glioma cells and in 2-hydroxyoleic acid therapy. Proc Natl Acad Sci U S A 2011; 108:19569-74. [PMID: 22106271 DOI: 10.1073/pnas.1115484108] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The mechanism of action of 2-hydroxyoleic acid (2OHOA), a potent antitumor compound, has not yet been fully elucidated. Here, we show that human cancer cells have markedly lower levels of sphingomyelin (SM) than nontumor (MRC-5) cells. In this context, 2OHOA treatment strongly augments SM mass (4.6-fold), restoring the levels found in MRC-5 cells, while a loss of phosphatidylethanolamine and phosphatidylcholine is observed (57 and 30%, respectively). The increased SM mass was due to a rapid and highly specific activation of SM synthases (SMS). This effect appeared to be specific against cancer cells as it did not affect nontumor MRC-5 cells. Therefore, low SM levels are associated with the tumorigenic transformation that produces cancer cells. SM accumulation occurred at the plasma membrane and caused an increase in membrane global order and lipid raft packing in model membranes. These modifications would account for the observed alteration by 2OHOA in the localization of proteins involved in cell apoptosis (Fas receptor) or differentiation (Ras). Importantly, SMS inhibition by D609 diminished 2OHOA effect on cell cycle. Therefore, we propose that the regulation of SMS activity in tumor cells is a critical upstream event in 2OHOA antitumor mechanism, which also explains its specificity for cancer cells, its potency, and the lack of undesired side effects. Finally, the specific activation of SMS explains the ability of this compound to trigger cell cycle arrest, cell differentiation, and autophagy or apoptosis in cancer cells.
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31
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Zeng DX, Xu YJ, Liu XS, Wang R, Xiang M. Cigarette smoke extract induced rat pulmonary artery smooth muscle cells proliferation via PKCα-mediated cyclin D1 expression. J Cell Biochem 2011; 112:2082-8. [PMID: 21465534 DOI: 10.1002/jcb.23131] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Cigarette smoke could induce pulmonary smooth muscle cells (PASMCs) proliferation. Although our previous study had implied the involvement of protein kinase Cα (PKCα), the molecular mechanism underlying PKCα pathway in this process is still unknown. In this study, rat PASMCs were stimulated by cigarette smoke extract (CSE) or PMA (a special activator to PKCα). Two percent CSE and PMA significantly enhanced cyclin D1 expression and cells proliferation. But cyclin D1-specific siRNA successfully inhibited DNA synthesis in CSE-treated or PMA-treated cells. On the other hand, PKCα-specific siRNA significantly suppressed cyclin D1 expression in CSE-treated cells. Moreover, PKCα-specific siRNA resulted in a cell-cycle arrest in G0/G1 and decreased cells number significantly. We conclude that CSE induced rat PASMCs proliferation at least partly via PKCα-mediated cyclin D1 expression.
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Affiliation(s)
- Da-Xiong Zeng
- Key Laboratory of Pulmonary Diseases of Ministry of Health, Department of Respiratory Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, PR China
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