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Pan W, Yun T, Ouyang X, Ruan Z, Zhang T, An Y, Wang R, Zhu P. A blood-based multi-omic landscape for the molecular characterization of kidney stone disease. Mol Omics 2024; 20:322-332. [PMID: 38623715 DOI: 10.1039/d3mo00261f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Kidney stone disease (KSD, also named renal calculi, nephrolithiasis, or urolithiasis) is a common urological disease entailing the formation of minerals and salts that form inside the urinary tract, frequently caused by diabetes, high blood pressure, hypertension, and monogenetic components in most patients. 10% of adults worldwide are affected by KSD, which continues to be highly prevalent and with increasing incidence. For the identification of novel therapeutic targets in KSD, we adopted high-throughput sequencing and mass spectrometry (MS) techniques in this study and carried out an integrative analysis of exosome proteomic data and DNA methylation data from blood samples of normal and KSD individuals. Our research delineated the profiling of exosomal proteins and DNA methylation in both healthy individuals and those afflicted with KSD, finding that the overexpressed proteins and the demethylated genes in KSD samples are associated with immune responses. The consistency of the results in proteomics and epigenetics supports the feasibility of the comprehensive strategy. Our insights into the molecular landscape of KSD pave the way for a deeper understanding of its pathogenic mechanism, providing an opportunity for more precise diagnosis and targeted treatment strategies for KSD.
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Affiliation(s)
- Weibing Pan
- Department of Urology, Shenzhen Pingshan People's Hospital, Shenzhen, Guangdong 518118, China
| | - Tianwei Yun
- Department of Urology, Shenzhen Pingshan People's Hospital, Shenzhen, Guangdong 518118, China
| | - Xin Ouyang
- Department of Laboratory Medicine, Shenzhen Pingshan People's Hospital, Shenzhen, Guangdong 518118, China.
| | - Zhijun Ruan
- Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518020, China.
| | - Tuanjie Zhang
- Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518020, China.
| | - Yuhao An
- Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518020, China.
| | - Rui Wang
- Pingshan Translational Medicine Center, Shenzhen Bay Laboratory, Shenzhen, Guangdong 518020, China.
| | - Peng Zhu
- Department of Laboratory Medicine, Shenzhen Pingshan People's Hospital, Shenzhen, Guangdong 518118, China.
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Garg A, Bandyopadhyay S. Role of an interdependent Wnt, GSK3-β/β-catenin and HB-EGF/EGFR mechanism in arsenic-induced hippocampal neurotoxicity in adult mice. CHEMOSPHERE 2024; 352:141375. [PMID: 38325618 DOI: 10.1016/j.chemosphere.2024.141375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2023] [Revised: 01/17/2024] [Accepted: 02/02/2024] [Indexed: 02/09/2024]
Abstract
We previously reported the neurotoxic effects of arsenic in the hippocampus. Here, we explored the involvement of Wnt pathway, which contributes to neuronal functions. Administering environmentally relevant arsenic concentrations to postnatal day-60 (PND60) mice demonstrated a dose-dependent increase in hippocampal Wnt3a and its components, Frizzled, phospho-LRP6, Dishevelled and Axin1 at PND90 and PND120. However, p-GSK3-β(Ser9) and β-catenin levels although elevated at PND90, decreased at PND120. Additionally, treatment with Wnt-inhibitor, rDkk1, reduced p-GSK3-β(Ser9) and β-catenin at PND90, but failed to affect their levels at PND120, indicating a time-dependent link with Wnt. To explore other underlying factors, we assessed epidermal growth factor receptor (EGFR) pathway, which interacts with GSK3-β and appears relevant to neuronal functions. We primarily found that arsenic reduced hippocampal phosphorylated-EGFR and its ligand, Heparin-binding EGF-like growth factor (HB-EGF), at both PND90 and PND120. Moreover, treatment with HB-EGF rescued p-GSK3-β(Ser9) and β-catenin levels at PND120, suggesting their HB-EGF/EGFR-dependent regulation at this time point. Additionally, rDkk1, LiCl (GSK3-β-activity inhibitor), or β-catenin protein treatments induced a time-dependent recovery in HB-EGF, indicating potential inter-dependent mechanism between hippocampal Wnt/β-catenin and HB-EGF/EGFR following arsenic exposure. Fluorescence immunolabeling then validated these findings in hippocampal neurons. Further exploration of hippocampal neuronal survival and apoptosis demonstrated that treatment with rDkk1, LiCl, β-catenin and HB-EGF improved Nissl staining and NeuN levels, and reduced cleaved-caspase-3 levels in arsenic-treated mice. Supportively, we detected improved Y-Maze and Passive Avoidance performances for learning-memory functions in these mice. Overall, our study provides novel insights into Wnt/β-catenin and HB-EGF/EGFR pathway interaction in arsenic-induced hippocampal neurotoxicity.
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Affiliation(s)
- Asmita Garg
- Systems Toxicology Group, Food, Drug & Chemical, Environment and Systems Toxicology Division, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sanghamitra Bandyopadhyay
- Systems Toxicology Group, Food, Drug & Chemical, Environment and Systems Toxicology Division, CSIR-Indian Institute of Toxicology Research (CSIR-IITR), Vishvigyan Bhawan, 31, Mahatma Gandhi Marg, Lucknow, 226001, Uttar Pradesh, India; Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
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Arend R, Dholakia J, Castro C, Matulonis U, Hamilton E, Jackson CG, LyBarger K, Goodman HM, Duska LR, Mahdi H, ElNaggar AC, Kagey MH, Liu A, Piper D, Barroilhet LM, Bradley W, Sachdev J, Sirard CA, O'Malley DM, Birrer M. DKK1 is a predictive biomarker for response to DKN-01: Results of a phase 2 basket study in women with recurrent endometrial carcinoma. Gynecol Oncol 2023; 172:82-91. [PMID: 37001446 DOI: 10.1016/j.ygyno.2023.03.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 03/08/2023] [Accepted: 03/17/2023] [Indexed: 03/31/2023]
Abstract
PURPOSE Dickkopf-1 (DKK1) is a Wnt signaling modulator promoting tumor growth, metastasis, angiogenesis, and immunosuppression by regulating innate immunity. DKK1 is over-expressed in gynecologic cancers and is associated with shortened survival. DKN-01 is a humanized monoclonal antibody with DKK1 neutralizing activity that may provide clinical benefit to patients whose tumors have overexpression of DKK1 or Wnt genetic alterations. METHODS We conducted an open-label, Phase 2 basket study with 2-stage design in patients with endometrial carcinoma (EC) and platinum-resistant/refractory epithelial ovarian cancer. DKN-01 was administered either as monotherapy or in combination with weekly paclitaxel at investigator's discretion. All patients underwent NGS testing prior to enrollment; tumor tissue was also tested for DKK1 expression by RNAscope pre-treatment and after cycle 1 if available. At least 50% of patients were required to have a Wnt signaling alteration either directly or tangentially. This publication reports results from the EC population overall and by DKK1-expression. RESULTS DKN-01 monotherapy and in combination with paclitaxel was more effective in patients with high DKK1-expressing tumors compared to low-expressing tumors. DKN-01 monotherapy demonstrated an objective response rate [ORR] of 25.0% vs. 0%; disease control rate [DCR] of 62.5% vs. 6.7%; median progression-free survival [PFS] was 4.3 vs. 1.8 months, and overall survival [OS] was 11.0 vs. 8.2 months in DKK1-high vs DKK1-low patients. Similarly, DKN-01 in combination with paclitaxel demonstrated greater clinical activity in patients with DKK1-high tumors compared to DKK1-low tumors: DCR was 55% vs. 44%; median PFS was 5.4 vs. 1.8 months; and OS was 19.1 vs. 10.1 months. Wnt activating mutations correlated with higher DKK1 expression. DKN-01 was well tolerated as a monotherapy and in combination with paclitaxel. CONCLUSIONS Collectively, data demonstrates promising clinical activity of a well-tolerated drug, DKN-01, in EC patients with high tumoral DKK1 expression which frequently corresponded to the presence of a Wnt activating mutation. Future development will focus on using DKN-01 in DKK1-high EC patients in combination with immunotherapy.
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Liu Y, Zhang Y, Chen S, Zhong X, Liu Q. Effect of LGR4/EGFR signaling on cell growth and cancer stem cell-like characteristics in liver cancer. Cytokine 2023; 165:156185. [PMID: 37001327 DOI: 10.1016/j.cyto.2023.156185] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/06/2023] [Accepted: 03/16/2023] [Indexed: 03/31/2023]
Abstract
PURPOSE Hepatocellular carcinoma (HCC) is the most common primary liver cancer. Leucine-rich repeat containing G-protein-coupled receptors 4 (LGR4) participates in tumor progression, invasion, and metastasis. Our study aimed to investigate the effect of LGR4 with epidermal growth factor receptor (EGFR) in HCC cells. METHODS We employed Hep3B and Huh7 cells to conduct our research. Comprehensive biological activities were characterized by CCK8 and transwell assay. Molecular biology techniques were used to determine the expression of proteins. Hep3B was employed to conduct subcutaneous tumor in mice. The tumor growth and the expression levels of proteins were assessed. RESULTS LGR4 overexpression could promote the cells proliferation, migration, and invasion ability, while siLGR4 and siEGFR could inhibit cells biological activities. In addition, LGR4 overexpression promoted the expression levels of RSPO2, β-catenin, EGFR and cancer stem cells (CSCs) markers, whereas silence of LGR4 or EGFR could diminish the expression levels of β-catenin and CSCs markers. Furthermore, knockdown of LGR4 or EGFR also inhibited tumor growth and reduced the expression levels of RSPO2, CD133, CD44, Nanog, β-catenin in vivo. CONCLUSION Our data suggest that LGR4 /EGFR signaling in HCC leads to induce tumor growth, which then contributes to stem cell characteristics. It maybe a new perspective for the targeted therapy of HCC treatment.
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Affiliation(s)
- Yanguo Liu
- Department Hepatobiliary and Pancreatic Surgery, Yantaishan Hospital, Yantai 264003, Shandong, China
| | - Yongming Zhang
- Department Hepatobiliary and Pancreatic Surgery, Yantaishan Hospital, Yantai 264003, Shandong, China
| | - Sen Chen
- Department Hepatobiliary and Pancreatic Surgery, Yantaishan Hospital, Yantai 264003, Shandong, China
| | - Xinning Zhong
- Department Hepatobiliary and Pancreatic Surgery, Yantaishan Hospital, Yantai 264003, Shandong, China
| | - Qing Liu
- Department Hepatobiliary and Pancreatic Surgery, Yantaishan Hospital, Yantai 264003, Shandong, China.
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Vlashi R, Zhang X, Wu M, Chen G. Wnt signaling: essential roles in osteoblast differentiation, bone metabolism and therapeutic implications for bone and skeletal disorders. Genes Dis 2022. [DOI: 10.1016/j.gendis.2022.07.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022] Open
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Liang W, Huang L, Ma X, Dong L, Cheng R, Dehdarani M, Karamichos D, Ma JX. Pathogenic Role of Diabetes-Induced Overexpression of Kallistatin in Corneal Wound Healing Deficiency Through Inhibition of Canonical Wnt Signaling. Diabetes 2022; 71:747-761. [PMID: 35044447 PMCID: PMC8965664 DOI: 10.2337/db21-0740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 12/27/2021] [Indexed: 01/21/2023]
Abstract
It was reported previously that circulation levels of kallistatin, an endogenous Wnt signaling inhibitor, are increased in patients with diabetes. The current study was conducted to determine the role of kallistatin in delayed wound healing in diabetic corneas. Immunostaining and Western blot analysis showed kallistatin levels were upregulated in corneas from humans and rodents with diabetes. In murine corneal wound healing models, the canonical Wnt signaling was activated in nondiabetic corneas and suppressed in diabetic corneas, correlating with delayed wound healing. Transgenic expression of kallistatin suppressed the activation of Wnt signaling in the cornea and delayed wound healing. Local inhibition of Wnt signaling in the cornea by kallistatin, an LRP6-blocking antibody, or the soluble VLDL receptor ectodomain (an endogenous Wnt signaling inhibitor) delayed wound healing. In contrast, ablation of the VLDL receptor resulted in overactivation of Wnt/β-catenin signaling and accelerated corneal wound healing. Activation of Wnt signaling in the cornea accelerated wound healing. Activation of Wnt signaling promoted human corneal epithelial cell migration and proliferation, which was attenuated by kallistatin. Our findings suggested that diabetes-induced overexpression of kallistatin contributes to delayed corneal wound healing by inhibiting the canonical Wnt signaling. Thus, kallistatin and Wnt/β-catenin signaling in the cornea could be potential therapeutic targets for diabetic corneal complications.
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Affiliation(s)
- Wentao Liang
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
| | - Li Huang
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
- Department of Ophthalmology, Fujian Medical University Union Hospital, Fuzhou, China
| | - Xiang Ma
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
| | - Lijie Dong
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
- Eye Institute and School of Optometry, Tianjin Medical University Eye Hospital, Tianjin, China
| | - Rui Cheng
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
| | - Marcus Dehdarani
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
| | - Dimitrios Karamichos
- North Texas Eye Research Institute, University of North Texas Health Science Center, Fort Worth, TX
- Department of Pharmaceutical Sciences, University of North Texas Health Science Center, Fort Worth, TX
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, Fort Worth, TX
| | - Jian-xing Ma
- Department of Physiology, University of Oklahoma Health Sciences Center, Oklahoma City, OK
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Barillari G, Bei R, Manzari V, Modesti A. Infection by High-Risk Human Papillomaviruses, Epithelial-to-Mesenchymal Transition and Squamous Pre-Malignant or Malignant Lesions of the Uterine Cervix: A Series of Chained Events? Int J Mol Sci 2021; 22:13543. [PMID: 34948338 PMCID: PMC8703928 DOI: 10.3390/ijms222413543] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/13/2021] [Accepted: 12/14/2021] [Indexed: 12/19/2022] Open
Abstract
Wound healing requires static epithelial cells to gradually assume a mobile phenotype through a multi-step process termed epithelial-to-mesenchymal transition (EMT). Although it is inherently transient and reversible, EMT perdures and is abnormally activated when the epithelium is chronically exposed to pathogens: this event deeply alters the tissue and eventually contributes to the development of diseases. Among the many of them is uterine cervical squamous cell carcinoma (SCC), the most frequent malignancy of the female genital system. SCC, whose onset is associated with the persistent infection of the uterine cervix by high-risk human papillomaviruses (HR-HPVs), often relapses and/or metastasizes, being resistant to conventional chemo- or radiotherapy. Given that these fearsome clinical features may stem, at least in part, from the exacerbated and long-lasting EMT occurring in the HPV-infected cervix; here we have reviewed published studies concerning the impact that HPV oncoproteins, cellular tumor suppressors, regulators of gene expression, inflammatory cytokines or growth factors, and the interactions among these effectors have on EMT induction and cervical carcinogenesis. It is predictable and desirable that a broader comprehension of the role that EMT inducers play in SCC pathogenesis will provide indications to flourish new strategies directed against this aggressive tumor.
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Affiliation(s)
- Giovanni Barillari
- Department of Clinical Sciences and Translational Medicine, University of Rome Tor Vergata, 1 via Montellier, 00133 Rome, Italy; (R.B.); (V.M.); (A.M.)
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Predicting Agents That Can Overcome 5-FU Resistance in Colorectal Cancers via Pharmacogenomic Analysis. Biomedicines 2021; 9:biomedicines9080882. [PMID: 34440086 PMCID: PMC8389646 DOI: 10.3390/biomedicines9080882] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 07/21/2021] [Accepted: 07/22/2021] [Indexed: 01/05/2023] Open
Abstract
5-Fluorouracil (5-FU) is one of several chemotherapeutic agents in clinical use as a standard of care to treat colorectal cancers (CRCs). As an antimetabolite, 5-FU inhibits thymidylate synthase to disrupt the synthesis and repair of DNA and RNA. However, only a small proportion of patients benefit from 5-FU treatment due to the development of drug resistance. This study applied pharmacogenomic analysis using two public resources, the Genomics of Drug Sensitivity in Cancer (GDSC) and the Connectivity Map, to predict agents overcoming 5-FU resistance in CRC cells based on their genetic background or gene expression profile. Based on the genetic status of adenomatous polyposis coli (APC), the most frequent mutated gene found in CRC, we found that combining a MEK inhibitor with 5-FU exhibited synergism effects on CRC cells with APC truncations. While considering the gene expression in 5-FU resistant cells, we demonstrated that targeting ROCK is a potential avenue to restore 5-FU response to resistant cells with wild-type APC background. Our results reveal MEK signaling plays a pivotal role in loss-of-function, APC-mediated 5-FU resistance, and ROCK activation serves as a signature in APC-independent 5-FU resistance. Through the use of these available database resources, we highlight possible approaches to predict potential drugs for combinatorial therapy for patients developing resistance to 5-FU treatment.
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Fundamental insights into the interaction between telomerase/TERT and intracellular signaling pathways. Biochimie 2020; 181:12-24. [PMID: 33232793 DOI: 10.1016/j.biochi.2020.11.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 11/07/2020] [Accepted: 11/16/2020] [Indexed: 12/12/2022]
Abstract
Telomerase activity is critical for cancer cells to provide unrestricted proliferation and cellular immortality through maintaining telomeres. Telomerase enzymatic activity is regulatable at the level of DNA, mRNA, post translational modifications, cellular transport and enzyme assembly. More recent studies confirm the interaction of the telomerase with various intracellular signaling pathways including PI3K/AKT/mTOR, NF-κB and Wnt/β-catenin which mainly participating in inflammation, epithelial to mesenchymal transition (EMT) and tumor cell invasion and metastasis. Furthermore, hTERT protein has been detected in non-nuclear sites such as the mitochondria and cytoplasm in cells. Mitochondrial TERT indicates various non-telomere-related functions such as decreasing reactive oxygen species (ROS) generation, boosting the respiration rate, protecting mtDNA by direct binding, interacting with mitochondrial tRNAs and increasing mitochondrial membrane potential which can lead to higher chemoresistance rate in cancer cells during therapies. Understanding the molecular mechanisms of the TERT function and depended interactions in tumor cells can suggest novel therapeutic approaches. Hence, in this review we will explain the telomerase activity regulation in translational and post translational levels besides the established correlations with various cell signaling pathways with possible pathways for therapeutic targeting.
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Hasegawa K, Kuwata K, Yoshitake J, Shimomura S, Uchida K, Shibata T. Extracellular vesicles derived from inflamed murine colorectal tissue induce fibroblast proliferation via epidermal growth factor receptor. FEBS J 2020; 288:1906-1917. [PMID: 32894891 DOI: 10.1111/febs.15557] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 07/22/2020] [Accepted: 09/01/2020] [Indexed: 12/26/2022]
Abstract
Inflammatory bowel diseases (IBDs), such as Crohn's disease and ulcerative colitis, are chronic inflammatory disorders of the gastrointestinal tract. Although IBDs increase the risk of colitis-associated colon cancer, the underlying mechanisms are not fully understood. Extracellular vesicles (EVs) are lipid-bound sacs that transport proteins, RNA, and lipids between cells and are key mediators of cellular communication in both physiological and pathological settings. EVs have been implicated in many cancer hallmarks, including uncontrolled tumor growth and metastasis. In this study, we investigated the effects of colon-derived EVs on the proliferation of fibroblasts. We used comparative proteomics to characterize protein profiles of colorectal EVs isolated from healthy mice (Con-EVs) and those with dextran sulfate sodium-induced colitis (IBD-EVs). The results showed that 109 proteins were upregulated in IBD-EVs. Notably, expression of epidermal growth factor receptor (EGFR), which plays important roles in cell proliferation and development, was increased in IBD-EVs. We then examined the effect of EVs on murine NIH3T3 fibroblasts and found that IBD-EVs significantly promoted cell proliferation in EGFR- and ERK-dependent manner. Our findings suggest that inflamed colon-derived EVs promote tumor development thorough activation of fibroblasts.
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Affiliation(s)
- Kana Hasegawa
- Graduate School of Bioagricultural Sciences, Nagoya University, Japan
| | - Keiko Kuwata
- Institute of Transformative Bio-Molecules (ITbM), Nagoya University, Japan
| | - Jun Yoshitake
- Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Japan
| | - Sayako Shimomura
- Graduate School of Bioagricultural Sciences, Nagoya University, Japan
| | - Koji Uchida
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, Japan.,Japan Agency for Medical Research and Development, CREST, Tokyo, Japan
| | - Takahiro Shibata
- Graduate School of Bioagricultural Sciences, Nagoya University, Japan.,Institute of Nano-Life-Systems, Institutes of Innovation for Future Society, Nagoya University, Japan
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Razak S, Afsar T, Almajwal A, Alam I, Jahan S. Growth inhibition and apoptosis in colorectal cancer cells induced by Vitamin D-Nanoemulsion (NVD): involvement of Wnt/β-catenin and other signal transduction pathways. Cell Biosci 2019; 9:15. [PMID: 30733856 PMCID: PMC6359839 DOI: 10.1186/s13578-019-0277-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2018] [Accepted: 01/23/2019] [Indexed: 12/21/2022] Open
Abstract
BACKGROUND More than the two decades, the question of whether vitamin D has a role in cancer frequency, development, and death has been premeditated in detail. Colorectal, breast, and prostate cancers have been a scrupulous spot of center, altogether, these three malignancies report for approximately 35% of cancer cases and 20% of cancer demises in the United States, and as such are a chief public health apprehension. The aim was to evaluate antitumor activity of Vitamin D-Nanoemulsion (NVD) in colorectal cancer cell lines and HCT116 xenograft model in a comprehensive approach. METHODS Two human colorectal cancer cell lines HCT116 and HT29 (gained from College of Pharmacy, King Saud University, KSA were grown. 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenyl tetrazoliumbromide protocol were performed to show the impact of NVD and β-catenin inhibitor (FH535) on the viability of HCT116 and HT29 cell lines. Apoptosis/cell cycle assay was performed. Analysis was done with a FACScan (Becton-Dickinson, NJ). About 10,000 cells per sample were harvested and Histograms of DNA were analyzed with ModiFitLT software (verity Software House, ME, USA). Western blotting and RT-PCR were performed for protein and gene expression respectively in in vitro and in vivo. RESULTS We found that NVD induced cytotoxicity in colorectal cells in a dose-dependent manner and time dependent approach. Further, our data validated that NVD administration of human colorectal cancer HCT116 and HT29 cells resulted in cell growth arrest, alteration in molecules regulating cell cycle operative in the G2 phase of the cell cycle and apoptosis in a dose dependent approach. Further our results concluded that NVD administration decreases expression of β-catenin gene, AKT gene and Survivin gene and protein expression in in vitro and in vivo. CONCLUSION Our findings suggest that targeting β-catenin gene may encourage the alterations of cell cycle and cell cycle regulators. Wnt/β-catenin signaling pathway possibly takes part in the genesis and progression of colorectal cancer cells through regulating cell cycle and the expression of cell cycle regulators.
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Affiliation(s)
- Suhail Razak
- Department of Animal Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Tayyaba Afsar
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Ali Almajwal
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Iftikhar Alam
- Department of Community Health Sciences, College of Applied Medical Sciences, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Sarwat Jahan
- Department of Animal Sciences, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
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Wang X, Wang X, Liu Y, Dong Y, Wang Y, Kassab MA, Fan W, Yu X, Wu C. LGR5 regulates gastric adenocarcinoma cell proliferation and invasion via activating Wnt signaling pathway. Oncogenesis 2018; 7:57. [PMID: 30089773 PMCID: PMC6082861 DOI: 10.1038/s41389-018-0071-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 06/20/2018] [Accepted: 06/29/2018] [Indexed: 12/20/2022] Open
Abstract
LGR5 plays a critical role in tissue development and the maintenance of adult stem cells in gastrointestinal tract. However, the oncogenic role of LGR5 in the development of gastric adenocarcinoma remains elusive. Here, we show that LGR5 promotes gastric adenocarcinoma cell proliferation and metastasis. We find that knock down of LGR5 or suppression of Wnt signaling pathway by inhibitor C59 arrests gastric adenocarcinoma cell proliferation and invasion. Moreover, treatment of Wnt3a, the activator of Wnt signaling pathway, partially recovers the proliferation defect observed in LGR5 knockdown gastric adenocarcinoma cells. Moreover, LGR5 facilitates β-catenin nuclear accumulation, a surrogate marker of the activation of Wnt signaling pathway. In addition, C59 treatment suppresses transcription of Axin2 and TCF1, both of which are the target genes of β-catenin in gastric adenocarcinoma cells. Gastric adenocarcinoma cells with overexpressed LGR5 form a large quantity of visible actin filaments and pseudopods, suggesting that LGR5 significantly enhances the ability of cell movement, which might capacitate gastric adenocarcinoma cells with enhanced LGR5 expression to gain invasive and migratory properties. Taken together, our results show that LGR5 contributes to cell proliferation and invasion through the activation of Wnt/β-catenin-signaling pathway in gastric adenocarcinoma cells.
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Affiliation(s)
- Xiangfei Wang
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China
| | - Xiumin Wang
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China
| | - Yang Liu
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China
| | - Yating Dong
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China
| | - Yanan Wang
- Affiliated hospital of Hebei University, Baoding, 071002, Hebei, China
| | - Muzaffer Ahmad Kassab
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA
| | - Wufang Fan
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China.
| | - Xiaochun Yu
- Department of Cancer Genetics and Epigenetics, Beckman Research Institute, City of Hope, 1500 E. Duarte Rd, Duarte, CA, 91010, USA.
| | - Chen Wu
- College of Life Sciences, Hebei University, Baoding, 071002, Hebei, China.
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Aznar N, Ear J, Dunkel Y, Sun N, Satterfield K, He F, Kalogriopoulos NA, Lopez-Sanchez I, Ghassemian M, Sahoo D, Kufareva I, Ghosh P. Convergence of Wnt, growth factor, and heterotrimeric G protein signals on the guanine nucleotide exchange factor Daple. Sci Signal 2018; 11:11/519/eaao4220. [PMID: 29487190 DOI: 10.1126/scisignal.aao4220] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Cellular proliferation, differentiation, and morphogenesis are shaped by multiple signaling cascades, and their dysregulation plays an integral role in cancer progression. Three cascades that contribute to oncogenic potential are those mediated by Wnt proteins and the receptor Frizzled (FZD), growth factor receptor tyrosine kinases (RTKs), and heterotrimeric G proteins and associated GPCRs. Daple is a guanine nucleotide exchange factor (GEF) for the G protein Gαi Daple also binds to FZD and the Wnt/FZD mediator Dishevelled (Dvl), and it enhances β-catenin-independent Wnt signaling in response to Wnt5a-FZD7 signaling. We identified Daple as a substrate of multiple RTKs and non-RTKs and, hence, as a point of convergence for the three cascades. We found that phosphorylation near the Dvl-binding motif in Daple by both RTKs and non-RTKs caused Daple/Dvl complex dissociation and augmented the ability of Daple to bind to and activate Gαi, which potentiated β-catenin-independent Wnt signals and stimulated epithelial-mesenchymal transition (EMT) similarly to Wnt5a/FZD7 signaling. Although Daple acts as a tumor suppressor in the healthy colon, the concurrent increased abundance of Daple and epidermal growth factor receptor (EGFR) in colorectal tumors was associated with poor patient prognosis. Thus, the Daple-dependent activation of Gαi and the Daple-dependent enhancement of β-catenin-independent Wnt signals are not only stimulated by Wnt5a/FZD7 to suppress tumorigenesis but also hijacked by growth factor-activated RTKs to enhance tumor progression. These findings identify a cross-talk paradigm among growth factor RTKs, heterotrimeric G proteins, and the Wnt/FZD pathway in cancer.
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Affiliation(s)
- Nicolas Aznar
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.
| | - Jason Ear
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Ying Dunkel
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Nina Sun
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Kendall Satterfield
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | - Fang He
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA
| | | | | | - Majid Ghassemian
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093, USA
| | - Debashis Sahoo
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, CA 92093, USA.,Department of Computer Science and Engineering, Jacobs School of Engineering, University of California, San Diego, La Jolla, CA 92093, USA
| | - Irina Kufareva
- Department of Pediatrics, University of California, San Diego, La Jolla, CA 92093, USA
| | - Pradipta Ghosh
- Department of Medicine, University of California, San Diego, La Jolla, CA 92093, USA. .,Department of Cellular and Molecular Medicine, University of California, San Diego, La Jolla, CA 92093, USA.,Moores Cancer Center, University of California, San Diego, La Jolla, CA 92093, USA
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14
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Jeong WJ, Ro EJ, Choi KY. Interaction between Wnt/β-catenin and RAS-ERK pathways and an anti-cancer strategy via degradations of β-catenin and RAS by targeting the Wnt/β-catenin pathway. NPJ Precis Oncol 2018; 2:5. [PMID: 29872723 PMCID: PMC5871897 DOI: 10.1038/s41698-018-0049-y] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 01/23/2018] [Accepted: 01/26/2018] [Indexed: 12/27/2022] Open
Abstract
Aberrant activation of the Wnt/β-catenin and RAS-extracellular signal-regulated kinase (ERK) pathways play important roles in the tumorigenesis of many different types of cancer, most notably colorectal cancer (CRC). Genes for these two pathways, such as adenomatous polyposis coli (APC) and KRAS are frequently mutated in human CRC, and involved in the initiation and progression of the tumorigenesis, respectively. Moreover, recent studies revealed interaction of APC and KRAS mutations in the various stages of colorectal tumorigenesis and even in metastasis accompanying activation of the cancer stem cells (CSCs). A key event in the synergistic cooperation between Wnt/β-catenin and RAS-ERK pathways is a stabilization of both β-catenin and RAS especially mutant KRAS by APC loss, and pathological significance of this was indicated by correlation of increased β-catenin and RAS levels in human CRC where APC mutations occur as high as 90% of CRC patients. Together with the notion of the protein activity reduction by lowering its level, inhibition of both β-catenin and RAS especially by degradation could be a new ideal strategy for development of anti-cancer drugs for CRC. In this review, we will discuss interaction between the Wnt/β-catenin and RAS-ERK pathways in the colorectal tumorigenesis by providing the mechanism of RAS stabilization by aberrant activation of Wnt/β-catenin. We will also discuss our small molecular anti-cancer approach controlling CRC by induction of specific degradations of both β-catenin and RAS via targeting Wnt/β-catenin pathway especially for the KYA1797K, a small molecule specifically binding at the regulator of G-protein signaling (RGS)-domain of Axin.
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Affiliation(s)
- Woo-Jeong Jeong
- 1Translational Research Center for Protein Function Control, Yonsei University, Seoul, Korea.,2Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, Korea
| | - Eun Ji Ro
- 1Translational Research Center for Protein Function Control, Yonsei University, Seoul, Korea.,2Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, Korea
| | - Kang-Yell Choi
- 1Translational Research Center for Protein Function Control, Yonsei University, Seoul, Korea.,2Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, Korea
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15
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Lee SK, Hwang JH, Choi KY. Interaction of the Wnt/β-catenin and RAS-ERK pathways involving co-stabilization of both β-catenin and RAS plays important roles in the colorectal tumorigenesis. Adv Biol Regul 2018; 68:46-54. [PMID: 29449169 DOI: 10.1016/j.jbior.2018.01.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 01/08/2018] [Accepted: 01/08/2018] [Indexed: 12/21/2022]
Abstract
Cancer development is usually driven by multiple genetic and molecular alterations rather than by a single defect. In the human colorectal cancer (CRC), series of mutations of genes are involved in the different stages of tumorigenesis. For example, adenomatous polyposis coli (APC) and KRAS mutations have been known to play roles in the initiation and progression of the tumorigenesis, respectively. However, many studies indicate that mutations of these two genes, which play roles in the Wnt/β-catenin and RAS-extra-cellular signal regulated kinase (ERK) pathways, respectively, cooperatively interact in the tumorigenesis in several different cancer types including CRC. Both Apc and Kras mutations critically increase number and growth rate of tumors although single mutation of these genes does not significantly enhance the small intestinal tumorigenesis of mice. Both APC and KRAS mutations even result in the liver metastasis with inductions of the cancer stem cells (CSCs) markers in a mice xenograft model. In this review, we are going to describe the history for interaction between the Wnt/β-catenin and RAS/ERK pathways especially related with CRC, and provide the mechanical basis for the cross-talk between the two pathways. The highlight of the crosstalk involving the stability regulation of RAS protein via the Wnt/β-catenin signaling which is directly related with the cellular proliferation and transformation will be discussed. Activation status of GSK3β, a key enzyme involving both β-catenin and RAS degradations, is regulated by the status of the Wnt/β-catenin signaling dependent upon extracellular stimuli or intracellular abnormalities of the signaling components. The levels of both β-catenin and RAS proteins are co-regulated by the Wnt/β-catenin signaling, and these proteins are overexpressed with a positive correlation in the tumor tissues of CRC patients. These results indicate that the elevation of both β-catenin and RAS proteins is pathologically significant in CRC. In this review, we also will discuss further involvement of the increments of both β-catenin and RAS especially mutant KRAS in the activation of CSCs and metastasis. Overall, the increments of β-catenin and RAS especially mutant KRAS by APC loss play important roles in the cooperative tumorigenesis of CRC.
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Affiliation(s)
- Sang-Kyu Lee
- Translational Research Center for Protein Function Control, Yonsei University, Seoul, South Korea; Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Jeong-Ha Hwang
- Translational Research Center for Protein Function Control, Yonsei University, Seoul, South Korea; Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea
| | - Kang-Yell Choi
- Translational Research Center for Protein Function Control, Yonsei University, Seoul, South Korea; Department of Biotechnology, College of Life Science and Biotechnology, Yonsei University, Seoul, South Korea.
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16
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Maarouf OH, Aravamudhan A, Rangarajan D, Kusaba T, Zhang V, Welborn J, Gauvin D, Hou X, Kramann R, Humphreys BD. Paracrine Wnt1 Drives Interstitial Fibrosis without Inflammation by Tubulointerstitial Cross-Talk. J Am Soc Nephrol 2015. [PMID: 26204899 DOI: 10.1681/asn.2014121188] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
AKI with incomplete epithelial repair is a major contributor to CKD characterized by tubulointerstitial fibrosis. Injury-induced epithelial secretion of profibrotic factors is hypothesized to underlie this link, but the identity of these factors and whether epithelial injury is required remain undefined. We previously showed that activation of the canonical Wnt signaling pathway in interstitial pericytes cell autonomously drives myofibroblast activation in vivo. Here, we show that inhibition of canonical Wnt signaling also substantially prevented TGFβ-dependent myofibroblast activation in vitro. To investigate whether Wnt ligand derived from proximal tubule is sufficient for renal fibrogenesis, we generated a novel mouse strain with inducible proximal tubule Wnt1 secretion. Adult mice were treated with vehicle or tamoxifen and euthanized at 12 or 24 weeks postinjection. Compared with vehicle-treated controls, kidneys with tamoxifen-induced Wnt1 expression from proximal tubules displayed interstitial myofibroblast activation and proliferation and increased matrix protein production. PDGF receptor β-positive myofibroblasts isolated from these kidneys exhibited increased canonical Wnt target gene expression compared with controls. Notably, fibrotic kidneys had no evidence of inflammatory cytokine expression, leukocyte infiltration, or epithelial injury, despite the close histologic correlation of each with CKD. These results provide the first example of noninflammatory renal fibrosis. The fact that epithelial-derived Wnt ligand is sufficient to drive interstitial fibrosis provides strong support for the maladaptive repair hypothesis in the AKI to CKD transition.
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Affiliation(s)
- Omar H Maarouf
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts
| | - Anusha Aravamudhan
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Deepika Rangarajan
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Tetsuro Kusaba
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Victor Zhang
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Jeremy Welborn
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Daniel Gauvin
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Xiuyun Hou
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Rafael Kramann
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Division of Nephrology and Clinical Immunology and Medical Faculty, Rheinisch-Westfälische Technische Hochschule Aachen University, Aachen, Germany; and
| | - Benjamin D Humphreys
- Renal Division, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts; Harvard Medical School, Boston, Massachusetts; Harvard Stem Cell Institute, Cambridge, Massachusetts
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Qi L, Sun B, Liu Z, Cheng R, Li Y, Zhao X. Wnt3a expression is associated with epithelial-mesenchymal transition and promotes colon cancer progression. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2014; 33:107. [PMID: 25499541 PMCID: PMC4269867 DOI: 10.1186/s13046-014-0107-4] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/12/2014] [Accepted: 12/01/2014] [Indexed: 12/19/2022]
Abstract
Introduction Epithelial–mesenchymal transition (EMT) contributes to the progression and metastasis of cancer cells and is associated with a more invasive phenotype of cancer. The Wnt/β-catenin signaling pathway is one of the major pathways involved in EMT regulation. Many studies provide evidence that β-catenin, the key regulator of the canonical Wnt signaling pathway, is important in regulating EMT in cancer. However, the roles of Wnt3a, the representative canonical Wnt ligand, in EMT and colon cancer progression have not yet been fully explored. Methods The expression levels of Wnt3a and EMT-associated proteins (E-cadherin, vimentin, and β-catenin) were assessed by immunohistochemistry in human colon cancer tissues to evaluate the clinicopathological significance of Wnt3a, as well as the correlation between Wnt3a and EMT. We then upregulated Wnt3a expression in HCT116 colon cancer cells, established a nude mouse xenograft model, detected the expression of EMT and Wnt/β-catenin signaling-associated proteins, and observed invasion and clone-initiating abilities. Results In 203 human colon cancer tissue samples, Wnt3a protein overexpression was related to colon cancer histological differentiation (P = 0.004), clinical stage (P = 0.008), presence of metastasis and recurrence (P = 0.036), and survival time (P = 0.007) of colon cancer patients. Wnt3a expression was notably concomitant with EMT immunohistochemical features, such as reduced expression of the epithelial marker E-cadherin (P = 0.012), increased expression of the mesenchymal marker vimentin (P = 0.002), and cytoplasmic distribution of β-catenin (P = 0.021). Results of in vitro and in vivo experiments showed that Wnt3a overexpression could alter cell morphology, regulate EMT-associated protein expression, and enhance clone-initiation and invasion. Dkk1 (antagonist of Wnt/β-catenin signaling) could also partially reverse the expression of EMT-associated proteins in Wnt3a-overexpressing cells. Conclusions Wnt3a expression was associated with EMT and promoted colon cancer progression. The EMT-inducing effect was partially due to the stimulative effect of Wnt3a on the Wnt/β-catenin pathway.
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Affiliation(s)
- Lisha Qi
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, China. .,The Key Laboratory of Tianjin Cancer Prevention and Treatment, Tianjin, 300060, China. .,National Clinical Research Center for Cancer, Tianjin, 300060, China.
| | - Baocun Sun
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, China. .,Department of Pathology, Tianjin Medical University, Tianjin, 300070, China. .,The Key Laboratory of Tianjin Cancer Prevention and Treatment, Tianjin, 300060, China. .,National Clinical Research Center for Cancer, Tianjin, 300060, China.
| | - Zhiyong Liu
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, China. .,The Key Laboratory of Tianjin Cancer Prevention and Treatment, Tianjin, 300060, China. .,National Clinical Research Center for Cancer, Tianjin, 300060, China.
| | - Runfen Cheng
- Department of Pathology, Tianjin Medical University Cancer Institute and Hospital, Tianjin, 300060, China. .,The Key Laboratory of Tianjin Cancer Prevention and Treatment, Tianjin, 300060, China. .,National Clinical Research Center for Cancer, Tianjin, 300060, China.
| | - Yixian Li
- Department of Pathology, Tianjin Medical University, Tianjin, 300070, China.
| | - Xiulan Zhao
- Department of Pathology, Tianjin Medical University, Tianjin, 300070, China.
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18
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Muniz-Feliciano L, Van Grol J, Portillo JAC, Liew L, Liu B, Carlin CR, Carruthers VB, Matthews S, Subauste CS. Toxoplasma gondii-induced activation of EGFR prevents autophagy protein-mediated killing of the parasite. PLoS Pathog 2013; 9:e1003809. [PMID: 24367261 PMCID: PMC3868508 DOI: 10.1371/journal.ppat.1003809] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Accepted: 10/19/2013] [Indexed: 12/24/2022] Open
Abstract
Toxoplasma gondii resides in an intracellular compartment (parasitophorous vacuole) that excludes transmembrane molecules required for endosome-lysosome recruitment. Thus, the parasite survives by avoiding lysosomal degradation. However, autophagy can re-route the parasitophorous vacuole to the lysosomes and cause parasite killing. This raises the possibility that T. gondii may deploy a strategy to prevent autophagic targeting to maintain the non-fusogenic nature of the vacuole. We report that T. gondii activated EGFR in endothelial cells, retinal pigment epithelial cells and microglia. Blockade of EGFR or its downstream molecule, Akt, caused targeting of the parasite by LC3(+) structures, vacuole-lysosomal fusion, lysosomal degradation and killing of the parasite that were dependent on the autophagy proteins Atg7 and Beclin 1. Disassembly of GPCR or inhibition of metalloproteinases did not prevent EGFR-Akt activation. T. gondii micronemal proteins (MICs) containing EGF domains (EGF-MICs; MIC3 and MIC6) appeared to promote EGFR activation. Parasites defective in EGF-MICs (MIC1 ko, deficient in MIC1 and secretion of MIC6; MIC3 ko, deficient in MIC3; and MIC1-3 ko, deficient in MIC1, MIC3 and secretion of MIC6) caused impaired EGFR-Akt activation and recombinant EGF-MICs (MIC3 and MIC6) caused EGFR-Akt activation. In cells treated with autophagy stimulators (CD154, rapamycin) EGFR signaling inhibited LC3 accumulation around the parasite. Moreover, increased LC3 accumulation and parasite killing were noted in CD154-activated cells infected with MIC1-3 ko parasites. Finally, recombinant MIC3 and MIC6 inhibited parasite killing triggered by CD154 particularly against MIC1-3 ko parasites. Thus, our findings identified EGFR activation as a strategy used by T. gondii to maintain the non-fusogenic nature of the parasitophorous vacuole and suggest that EGF-MICs have a novel role in affecting signaling in host cells to promote parasite survival.
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Affiliation(s)
- Luis Muniz-Feliciano
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
| | - Jennifer Van Grol
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
| | - Jose-Andres C. Portillo
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
| | - Lloyd Liew
- Division of Molecular Biosciences, Imperial College London, London, United Kingdom
| | - Bing Liu
- Division of Molecular Biosciences, Imperial College London, London, United Kingdom
| | - Cathleen R. Carlin
- Department of Molecular Biology and Microbiology, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
| | - Vern B. Carruthers
- Department of Microbiology and Immunology, University of Michigan Medical School, Ann Arbor, Michigan, United States of America
| | - Stephen Matthews
- Division of Molecular Biosciences, Imperial College London, London, United Kingdom
| | - Carlos S. Subauste
- Department of Pathology, Case Western Reserve University, Cleveland, Ohio, United States of America
- Division of Infectious Diseases and HIV Medicine, Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, Ohio, United States of America
- Department of Ophthalmology and Visual Sciences, Case Western Reserve University, Cleveland, Ohio, United States of America
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Nakai K, Yoneda K, Haba R, Kushida Y, Katsuki N, Moriue T, Kosaka H, Kubota Y, Inoue S. Deranged epidermal differentiation inkl/klmouse and the effects of βKlotho siRNA on the differentiation of HaCaT cells. Exp Dermatol 2013; 22:772-4. [DOI: 10.1111/exd.12258] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/01/2013] [Indexed: 12/21/2022]
Affiliation(s)
- Kozo Nakai
- Department of Dermatology; Kagawa University; Kita-Gun Japan
| | - Kozo Yoneda
- Department of Dermatology; Kagawa University; Kita-Gun Japan
| | - Reiji Haba
- Department of Diagnostic Pathology; Kagawa University; Kita-Gun Japan
| | - Yoshio Kushida
- Department of Diagnostic Pathology; Kagawa University; Kita-Gun Japan
| | - Naomi Katsuki
- Department of Diagnostic Pathology; Kagawa University; Kita-Gun Japan
| | - Tetsuya Moriue
- Department of Dermatology; Kagawa University; Kita-Gun Japan
| | - Hiroaki Kosaka
- Department of Cardiovascular Physiology; Kagawa University; Kita-Gun Japan
| | - Yasuo Kubota
- Department of Dermatology; Kagawa University; Kita-Gun Japan
| | - Shigeaki Inoue
- Institute of Innovative Science and technology; Tokai University; Isehara Japan
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20
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ARF6-regulated endocytosis of growth factor receptors links cadherin-based adhesion to canonical Wnt signaling in epithelia. Mol Cell Biol 2013; 33:2963-75. [PMID: 23716594 DOI: 10.1128/mcb.01698-12] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Wnt signaling has an essential role in embryonic development as well as stem/progenitor cell renewal, and its aberrant activation is implicated in many diseases, including several cancers. β-Catenin is a critical component of Wnt-mediated transcriptional activation. Here we show that ARF6 activation during canonical Wnt signaling promotes the intracellular accumulation of β-catenin via a mechanism that involves the endocytosis of growth factor receptors and robust activation of extracellular signal-regulated kinase (ERK). ERK promotes casein kinase 2-mediated phosphorylation of α-catenin, leading to destabilization of the adherens junctions and a subsequent increase in cytoplasmic pools of active β-catenin and E-cadherin. ERK also phosphorylates LRP6 to amplify the Wnt transduction pathway. The aforementioned Wnt-ERK signaling pathway initiates lumen filling of epithelial cysts by promoting cell proliferation in three-dimensional cell cultures. This study elucidates a mechanism responsible for the switch in β-catenin functions in cell adhesion at the adherens junctions and Wnt-induced nuclear signaling.
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21
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Zeller E, Hammer K, Kirschnick M, Braeuning A. Mechanisms of RAS/β-catenin interactions. Arch Toxicol 2013; 87:611-32. [PMID: 23483189 DOI: 10.1007/s00204-013-1035-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 02/28/2013] [Indexed: 12/20/2022]
Abstract
Signaling through the WNT/β-catenin and the RAS (rat sarcoma)/MAPK (mitogen-activated protein kinase) pathways plays a key role in the regulation of various physiological cellular processes including proliferation, differentiation, and cell death. Aberrant mutational activation of these signaling pathways is closely linked to the development of cancer in many organs, in humans as well as in laboratory animals. Over the past years, more and more evidence for a close linkage of the two oncogenic signaling cascades has accumulated. Using different experimental approaches, model systems, and experimental conditions, a variety of molecular mechanisms have been identified by which signal transduction through WNT/β-catenin and RAS interact, either in a synergistic or an antagonistic manner. Mechanisms of interaction comprise an upstream crosstalk at the level of pathway-activating ligands and their receptors, interrelations of cytosolic kinases involved in either pathways, as well as interaction in the nucleus related to the joint regulation of target gene transcription. Here, we present a comprehensive review of the current knowledge on the interaction of RAS/MAPK- and WNT/β-catenin-driven signal transduction in mammalian cells.
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Affiliation(s)
- Eva Zeller
- Department of Toxicology, Institute of Experimental and Clinical Pharmacology and Toxicology, University of Tübingen, Germany
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22
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Caverzasio J, Biver E, Thouverey C. Predominant role of PDGF receptor transactivation in Wnt3a-induced osteoblastic cell proliferation. J Bone Miner Res 2013; 28:260-70. [PMID: 22927028 DOI: 10.1002/jbmr.1748] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Revised: 08/02/2012] [Accepted: 08/20/2012] [Indexed: 12/17/2022]
Abstract
Previous studies have shown that Wnt3a enhances the proliferation and inhibits the osteogenic differentiation of human mesenchymal stem cells (hMSCs). In this study, we investigated the signaling pathways involved in Wnt3a-induced osteoblastic cell proliferation. Experiments with DKK1, a natural antagonist of Lrp5/6, indicated that Wnt/β-catenin did not play a major role in Wnt3a-induced osteoblastic cell proliferation. The use of selective inhibitors of known mitogenic pathways implicates Src family kinases (SFKs) and a protein kinase C (PKC) in this cellular response. Time-dependent analysis of signaling molecules activated by Wnt3a in MC3T3-E1 cells revealed parallel activation of the canonical pathway and of several tyrosine kinases, including SFKs and PDGF receptors (PDGF-Rs). Functional analysis with specific inhibitors suggested a major role of PDGF-Rs in mediating Wnt3a-induced cell proliferation. Further investigation with an si-RNA approach confirmed a predominant role of this receptor in this cellular response. The use of soluble decoy PDGF-Rs that can sequester extracellular PDGFs excluding that part of the increased PDGF receptor phosphorylation by Wnt3a was the result of autocrine production of PDGFs. A selective SFK inhibitor blunted the enhanced PDGF-R phosphorylation and cell proliferation induced by Wnt3a. Studies of initial events involved in the regulation of this pathway suggest a role of dishevelled. In conclusion, data presented in this study indicate that cell proliferation induced by Wnt3a in osteoblastic cells is mediated by a dishevelled-dependent and β-catenin-independent pathway, which involves the transactivation of PDGF receptors.
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Affiliation(s)
- Joseph Caverzasio
- Service of Bone Diseases, Department of Internal Medicine Specialties, University Hospital of Geneva, Geneva, Switzerland.
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23
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Melone MA, Calarco A, Petillo O, Margarucci S, Colucci-D'Amato L, Galderisi U, Koverech G, Peluso G. Mutant huntingtin regulates EGF receptor fate in non-neuronal cells lacking wild-type protein. Biochim Biophys Acta Mol Basis Dis 2013; 1832:105-13. [DOI: 10.1016/j.bbadis.2012.09.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2012] [Revised: 08/10/2012] [Accepted: 09/04/2012] [Indexed: 12/30/2022]
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Wnt ligands signal in a cooperative manner to promote foregut organogenesis. Proc Natl Acad Sci U S A 2012; 109:15348-53. [PMID: 22949635 DOI: 10.1073/pnas.1201583109] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Endoderm-mesenchyme cross-talk is a central process in the development of foregut-derived organs. How signaling pathways integrate the activity of multiple ligands to guide organ development is poorly understood. We show that two Wnt ligands, Wnt2 and Wnt7b, cooperatively induce Wnt signaling without affecting the stabilization of the Wnt canonical effector β-catenin despite it being necessary for Wnt2-Wnt7b cooperativity. Wnt2-Wnt7b cooperation is specific for mesenchymal cell lineages and the combined loss of Wnt2 and Wnt7b leads to more severe developmental defects in the lung than loss of Wnt2 or Wnt7b alone. High-throughput small-molecule screens and biochemical assays reveal that the Pdgf pathway is required for cooperative Wnt2-Wnt7b signaling. Inhibition of Pdgf signaling in cell culture reduces Wnt2-Wnt7b cooperative signaling. Moreover, inhibition of Pdgf signaling in lung explant cultures results in decreased Wnt signaling and lung smooth-muscle development. These data suggest a model in which Pdgf signaling potentiates Wnt2-Wnt7b signaling to promote high levels of Wnt activity in mesenchymal progenitors that is required for proper development of endoderm-derived organs, such as the lung.
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Association des thérapeutiques ciblées anti-EGFR avec la radio-chimiothérapie chez les patients présentant un cancer bronchique non à petites cellules localement avancé. ONCOLOGIE 2012. [DOI: 10.1007/s10269-012-2153-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chen HC, Zhu YT, Chen SY, Tseng SCG. Wnt signaling induces epithelial-mesenchymal transition with proliferation in ARPE-19 cells upon loss of contact inhibition. J Transl Med 2012; 92:676-87. [PMID: 22391957 PMCID: PMC3961713 DOI: 10.1038/labinvest.2011.201] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Proliferation and epithelial-mesenchymal transition (EMT) of the retinal pigment epithelium (RPE) are hallmarks of proliferative vitreoretinopathy. This study aims at clarifying the role of growth factors, such as epidermal growth factor (EGF), fibroblast growth factor-2 (FGF-2), and transforming growth factor-β1 (TGF-β1), in controlling how RPE proliferates while undergoing EMT. When contact inhibition of post-confluent ARPE-19 cells was disrupted by EGTA, an increase of BrdU labeling was noted only in the presence of EGF and/or FGF-2, and was accompanied by EMT as evidenced by the loss of a normal RPE phenotype (altered cytolocalization of RPE65, N-cadherin, ZO-1, and Na,K-ATPase) and the gain of a mesenchymal phenotype (increased expression of vimentin, S100A4, and α-smooth muscle actin). EMT with proliferation by EGTA+EGF+FGF-2 was accompanied by activation of canonical Wnt signaling (judged by the TCF/LEF promoter activity, increased nuclear levels of and interaction between β-catenin and LEF1 proteins, and the replication by overexpression of β-catenin), abolished by concomitant addition of XAV939, a Wnt inhibitor, but not associated with suppression of Hippo signaling (negative expression of nuclear TAZ or YAP and cytoplasmic p-TAZ or p-YAP). The causative role of Wnt signaling on EMT with proliferation was confirmed by overexpression of stable S33Y β-catenin with EGTA treatment. In addition, contact inhibition disrupted by EGTA in the presence of TGF-β1 also led to EMT, but suppressed proliferation and Wnt signaling. The Wnt signaling triggered by EGF+FGF-2 was sufficient and synergized with TGF-β1 in activating the Smad/ZEB1/2 signaling responsible for EMT. These findings establish a framework for further dissecting how RPE might partake in a number of proliferative vitreoretinopathies characterized by EMT.
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Affiliation(s)
- Hung-Chi Chen
- Tissue Tech, Inc., Ocular Surface Center, and Ocular Surface Research & Education Foundation, Miami, FL, USA,Department of Ophthalmology, Chang Gung Memorial Hospital and Graduate Institute of Clinical Medical Sciences, Chang Gung University, Taoyuan, Taiwan
| | - Ying-Ting Zhu
- Tissue Tech, Inc., Ocular Surface Center, and Ocular Surface Research & Education Foundation, Miami, FL, USA
| | - Szu-Yu Chen
- Tissue Tech, Inc., Ocular Surface Center, and Ocular Surface Research & Education Foundation, Miami, FL, USA
| | - Scheffer C. G. Tseng
- Tissue Tech, Inc., Ocular Surface Center, and Ocular Surface Research & Education Foundation, Miami, FL, USA
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Li JX, Fu LJ, Yang XG, Wang K. Integrin-mediated signaling contributes to gadolinium-containing-particle-promoted cell survival and G₁ to S phase cell cycle transition by enhancing focal adhesion formation. J Biol Inorg Chem 2011; 17:375-85. [PMID: 22086330 DOI: 10.1007/s00775-011-0859-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Accepted: 11/03/2011] [Indexed: 01/14/2023]
Abstract
We previously reported that Gd-containing particles formed under physiological conditions act as active entities to enhance cell survival and promote S phase entry via activation of both mitogen-activated protein kinase/extracellular-signal-regulated protein kinase (ERK) and phosphatidylinositol 3-kinase/Akt signaling pathways. However, how they transduce the extracellular signal inside the cell remains unclear. The present study demonstrates that Gd-containing particles can alleviate serum-deprivation-induced cell death and promote G₁ to S phase cell cycle progression by enhancing cell adhesion to the extracellular matrix. As an indicator of adhesion, the vinculin distribution was detected by confocal laser scanning microscopy. The control cells exhibited fewer and less typical focal adhesions. After treatment with Gd-containing particles, a large number of vinculin-containing focal adhesions were maintained. In the presence of integrin antagonists, the percentage of S phase entry induced by Gd-containing particles was decreased and the enhancement of cell viability was also attenuated, along with a decrease in both cyclin D expression and ERK phosphorylation. In summary, the present results suggest that the integrin-mediated signaling pathway plays an important role in cell survival and G₁ to S phase transition promoted by Gd-containing particles by enhancing focal adhesion formation. The results presented here provide novel evidence to advance knowledge leading to further understanding of the mechanisms of both cell proliferation and cell survival promoted by Gd and may be helpful for developing effective measures to prevent or treat nephrogenic systemic fibrosis.
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Affiliation(s)
- Jin-Xia Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing, 100191, People's Republic of China
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Chua AWC, Gan SU, Ting Y, Fu Z, Lim CK, Song C, Sabapathy K, Phan TT. Keloid fibroblasts are more sensitive to Wnt3a treatment in terms of elevated cellular growth and fibronectin expression. J Dermatol Sci 2011; 64:199-209. [PMID: 22005028 DOI: 10.1016/j.jdermsci.2011.09.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2011] [Revised: 08/25/2011] [Accepted: 09/14/2011] [Indexed: 12/24/2022]
Abstract
BACKGROUND Current evidence suggests the potential role of Wnt signalling in keloids pathogenesis but such literature remains scanty. We hypothesize that Wnt signalling is upregulated in keloid fibroblasts (KFs) and this promotes cellular growth, migration and extracellular matrix (ECM) production in such fibroblasts. OBJECTIVES To verify the downregulation of secreted frizzled-related protein 1 (SFRP1), a Wnt inhibitor and test KFs sensitivity to Wnt3a treatment compared to NFs in terms of activation of Wnt/β-catenin, cellular growth, migration and ECM expressions. Next, to investigate if ectopic expression of SFRP1 and treatment of quercetin in KFs can reverse their phenotypes. METHODS Quantitative Real-time PCR and western blotting were used to verify SFRP1 expression in NFs and KFs. The fibroblasts were tested with Wnt3a conditioned media and its effects were tested for (1) the cells' sensitivity to direct Wnt signalling via the activation of TCF reporter assay and protein expression of β-catenin, (2) cellular growth, (3) cell migration and (4) expressions of ECM components. Finally KFs were stably transduced with SFRP1 and treated with 2 doses of quercetin. RESULTS Lower levels of SFRP1 were confirmed at mRNA and protein levels in KFs which partly explained their sensitivity to Wnt3a treatment in terms of higher Wnt activation, cellular growth and fibronectin expression. Interestingly, Wnt3a did not promote higher cell migration rate and increase in collagen I expression. Ectopic expression of SFRP1 and quercetin treatment was able to mitigate Wnt3a-mediated phenotype of KFs. CONCLUSIONS Using SFRP1 or inhibitors of Wnt signalling might be one of the therapeutic solutions to treat keloid scarring.
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Cho IR, Koh SS, Min HJ, Kim SJ, Lee Y, Park EH, Ratakorn S, Jhun BH, Oh S, Johnston RN, Chung YH. Pancreatic adenocarcinoma up-regulated factor (PAUF) enhances the expression of β-catenin, leading to a rapid proliferation of pancreatic cells. Exp Mol Med 2011; 43:82-90. [PMID: 21196815 DOI: 10.3858/emm.2011.43.2.010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
It is not yet understood how the enhanced expression of pancreatic adenocarcinoma up-regulated factor (PAUF; a novel oncogene identified in our recent studies), contributes to the oncogenesis of pancreatic cells. We herein report that PAUF up-regulates the expression and transcriptional activity of β-catenin while the suppression of PAUF by shRNA down-regulates β-catenin. The induction of b-catenin by PAUF is mediated by the activities of Akt and GSK-3β, but inhibition of downstream ERK does not reduce β-catenin expression. To test whether PAUF emulates either the Wnt3a-mediated or the protein kinase A-mediated signaling pathway for the stabilization of β-catenin, we examined the phosphorylation status of β-catenin in the presence of PAUF compared with that of β-catenin during treatment with Wnt3a or dibutyryl cAMP, a cell permeable cyclic AMP analogue. PAUF expression induces phosphorylation at Ser-33/37/Thr-41 and Ser-675 of β-catenin but no phosphorylation at Ser-45, indicating that a unique phosphorylation pattern of b-catenin is caused by PAUF. Finally, the expression of PAUF up-regulates both cyclin-D1 and c-Jun, target genes of β-catenin, leading to a rapid proliferation of pancreatic cells; conversely decreased PAUF expression (by shRNA) results in the reduced proliferation of pancreatic cells. Treatment with hexachlorophene (an inhibitor of β-catenin) reduces the proliferation of pancreatic cells despite the presence of PAUF. Taken together, we propose that PAUF can up-regulate and stabilize β-catenin via a novel pattern of phosphorylation, thereby contributing to the rapid proliferation of pancreatic cancer cells.
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Affiliation(s)
- Il-Rae Cho
- Department of Cogno-Mechatronics Engineering, BK21 Nanofusion Technology Team, Pusan National University, Busan 609-736, Korea
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Bikkavilli RK, Malbon CC. Mitogen-activated protein kinases and Wnt/beta-catenin signaling: Molecular conversations among signaling pathways. Commun Integr Biol 2011; 2:46-9. [PMID: 19513264 DOI: 10.4161/cib.2.1.7503] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2008] [Accepted: 12/01/2008] [Indexed: 12/31/2022] Open
Abstract
Wnt/beta-catenin canonical pathway is critical for normal embryonic development; mutations and aberrant expression of specific components of this pathway can be oncogenic. Mitogen-activated protein kinase (MAPK) pathways, prominent in intracellular signaling, have been shown to have unique and provocative roles that impact the Wnt/beta-catenin signaling. We discuss recent insights that implicate the three major pathways of the MAPK network, i.e., mediated by p38, c-Jun N-terminal (JNK) kinase and Extra-cellular-Regulated Kinases (ERK) and their downstream signaling elements in Wnt/beta-catenin signaling. Novel "crosstalk" among MAPK and Wnt/beta-catenin canonical signaling pathways is essential. A fuller understanding of how such signaling is integrated during development is a high-value target for future research.
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Affiliation(s)
- Rama Kamesh Bikkavilli
- Department of Pharmacology; Health Sciences Center; State University of New York at Stony Brook; Stony Brook, New York USA
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Verkaar F, van der Doelen A, Smits J, Blankesteijn W, Zaman G. Inhibition of Wnt/β-Catenin Signaling by p38 MAP Kinase Inhibitors Is Explained by Cross-Reactivity with Casein Kinase Iδ/ɛ. ACTA ACUST UNITED AC 2011; 18:485-94. [DOI: 10.1016/j.chembiol.2011.01.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2010] [Revised: 12/13/2010] [Accepted: 01/26/2011] [Indexed: 12/01/2022]
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Song D, Liu X, Liu R, Yang L, Zuo J, Liu W. Connexin 43 hemichannel regulates H9c2 cell proliferation by modulating intracellular ATP and [Ca2+]. Acta Biochim Biophys Sin (Shanghai) 2010; 42:472-82. [PMID: 20705586 DOI: 10.1093/abbs/gmq047] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Connexin 43 (Cx43), known to be the main protein building blocks of gap junctions and hemichannels in mammalian heart, plays an important role in cardiocytes proliferation. Gap junctional intercellular communication has been suggested to be necessary for cellular proliferation and differentiation. However, the effect of Cx43 hemichannel on cardiocytes proliferation and the mechanism remain unclear. In this study, rat heart cell line H9c2 was used. The Cx43 location, the proliferation rate and hemichannel activity of H9c2 cells and Wnt-3a(+)-H9c2 cells were investigated and the changes of intracellular ATP and [Ca(2+)] were determined. Results showed that the inhibited hemichannel induced by 18beta-glycyrrhetinic acid (GA) evoked intracellular ATP and [Ca(2+)] increase and enhanced H9c2 cell proliferation. Wnt-3a(+)-H9c2 cells displayed enhanced hemichannel activity and proliferation rate. Inhibited hemichannel of Wnt-3a(+)-H9c2 cells induced by 18beta-GA decreased intracellular ATP, increased [Ca(2+)], and enhanced the proliferation of H9c2 cells. This study validated the role of hemichannel in H9c2 cell proliferation regulation, and showed a mechanism involved in the regulation of H9c2 cell proliferation. The proliferation could be enhanced by Cx43 hemichannel-mediated ATP release accompanying intracellular [Ca(2+)] change. However, different changes of ATP were observed in Wnt-3a(+)-H9c2 cells. These findings provided new insights into the molecular mechanisms of proliferation regulation in H9c2 cells and the effect of Wnt-3a on intracellular ATP.
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Affiliation(s)
- Dongli Song
- Department of Cellular and Genetic Medicine, Fudan University, Shanghai, China
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Hu T, Li C. Convergence between Wnt-β-catenin and EGFR signaling in cancer. Mol Cancer 2010; 9:236. [PMID: 20828404 PMCID: PMC2944186 DOI: 10.1186/1476-4598-9-236] [Citation(s) in RCA: 207] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Accepted: 09/09/2010] [Indexed: 12/13/2022] Open
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Kabashima K, Sakabe JI, Yoshiki R, Tabata Y, Kohno K, Tokura Y. Involvement of Wnt signaling in dermal fibroblasts. THE AMERICAN JOURNAL OF PATHOLOGY 2009; 176:721-32. [PMID: 20042673 DOI: 10.2353/ajpath.2010.090454] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Pachydermoperiostosis (PDP) is a rare disease characterized by unique phenotypes of the skin and bone, such as thick skin, implying that it may be caused by dysregulation of mesenchymal cells. The aim of this study is to examine the roles of dermal fibroblasts in the pathogenesis of pachydermia in association with Wnt signaling. The numbers of cultured fibroblasts were compared between healthy donors and PDP patients, and mRNA expression profiles in cultured dermal fibroblasts were examined by DNA microarray analysis and real-time reverse transcription-PCR. DKK1 and beta-catenin protein expressions were also evaluated by immunohistochemistry in the skin. To evaluate the in vivo roles of DKK1 in mice, DKK1 small interfering RNA was injected to the ears. We found that PDP fibroblasts proliferated more than control fibroblasts and that mRNA expression of a Wnt signaling antagonist, DKK1, was much lower in PDP fibroblasts than in normal ones. Consistently, decreased expression of DKK1 in fibroblasts and enhanced expression of beta-catenin were noted in PDP patients. Moreover, recombinant human DKK1 protein decreased the proliferation of dermal fibroblasts. In accord with the above human studies, intradermal injections of DKK1 small interfering RNA into mouse ears increased ear thickness as seen in PDP. Our findings suggest that enhanced Wnt signaling contributes to the development of pachydermia by enhancing dermal fibroblast functions.
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Affiliation(s)
- Kenji Kabashima
- Department of Dermatology, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan.
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Integration of the beta-catenin-dependent Wnt pathway with integrin signaling through the adaptor molecule Grb2. PLoS One 2009; 4:e7841. [PMID: 19924227 PMCID: PMC2773007 DOI: 10.1371/journal.pone.0007841] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2009] [Accepted: 10/23/2009] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND THE COMPLEXITY OF WNT SIGNALING LIKELY STEMS FROM TWO SOURCES: multiple pathways emanating from frizzled receptors in response to wnt binding, and modulation of those pathways and target gene responsiveness by context-dependent signals downstream of growth factor and matrix receptors. Both rac1 and c-jun have recently been implicated in wnt signaling, however their upstream activators have not been identified. METHODOLOGY/PRINCIPAL FINDINGS Here we identify the adapter protein Grb2, which is itself an integrator of multiple signaling pathways, as a modifier of beta-catenin-dependent wnt signaling. Grb2 synergizes with wnt3A, constitutively active (CA) LRP6, Dvl2 or CA-beta-catenin to drive a LEF/TCF-responsive reporter, and dominant negative (DN) Grb2 or siRNA to Grb2 block wnt3A-mediated reporter activity. MMP9 is a target of beta-catenin-dependent wnt signaling, and an MMP9 promoter reporter is also responsive to signals downstream of Grb2. Both a jnk inhibitor and DN-c-jun block transcriptional activation downstream of Dvl2 and Grb2, as does DN-rac1. Integrin ligation by collagen also synergizes with wnt signaling as does overexpression of Focal Adhesion Kinase (FAK), and this is blocked by DN-Grb2. CONCLUSIONS/SIGNIFICANCE These data suggest that integrin ligation and FAK activation synergize with wnt signaling through a Grb2-rac-jnk-c-jun pathway, providing a context-dependent mechanism for modulation of wnt signaling.
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Gosens R, Baarsma HA, Heijink IH, Oenema TA, Halayko AJ, Meurs H, Schmidt M. De novo synthesis of {beta}-catenin via H-Ras and MEK regulates airway smooth muscle growth. FASEB J 2009; 24:757-68. [PMID: 19906679 DOI: 10.1096/fj.09-136325] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
beta-Catenin is a component of adherens junctions that also acts as a transcriptional coactivator when expressed in the nucleus. Growth factors are believed to regulate the nuclear expression of beta-catenin via inactivation of glycogen synthase kinase 3 (GSK-3) by phosphorylation, resulting in increased beta-catenin protein stability. Here, we report on a novel pathway that regulates the expression and nuclear presence of beta-catenin. In proliferating human airway smooth muscle cells, we observed increased expression of beta-catenin, which was required for proliferation. Interestingly, increased beta-catenin expression was accompanied by an increase in beta-catenin mRNA and was independent of beta-catenin liberation from the plasma membrane, suggesting a role for de novo synthesis. This was confirmed using actinomycin D and cycloheximide, which abrogated the induction and nuclear localization of beta-catenin protein. GSK-3 inhibition using SB216763 failed to regulate beta-catenin mRNA. However, expression of dominant negative H-Ras or pharmacological inhibition of MEK reduced serum and TGF-beta-induced beta-catenin mRNA and protein. Collectively, these data indicate that beta-catenin is an important signaling intermediate in airway smooth muscle growth and that its cellular accumulation and nuclear localization require de novo protein synthesis effected, in part, via H-Ras and MEK.-Gosens, R., Baarsma, H. A., Heijink, I. H., Oenema, T. A., Halayko, A. J., Meurs, H., Schmidt, M. De novo synthesis of beta-catenin via H-Ras and MEK regulates airway smooth muscle growth.
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Affiliation(s)
- Reinoud Gosens
- Department of Molecular Pharmacology, University of Groningen, A. Deusinglaan 1, 9713 AV Groningen, The Netherlands.
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Abstract
We previously reported that clusterin enhances astrocyte proliferation and extracellular signal-regulated kinase (ERK) activity. It, however, remains largely unknown how clusterin promotes cell growth. Here, we investigate the signaling pathway and related molecules underlying astrocyte proliferation by clusterin. Exogenous clusterin stimulates Ras-dependent Raf-1/mitogen-activated protein kinase kinase (MEK)/ERK activation. Clusterin-induced astrocyte proliferation and ERK1/2 phosphorylation were abrogated by either AG1478 (an inhibitor of epidermal growth factor receptor, EGFR) or EGFR small interfering RNA. Furthermore, clusterin treatment provoked tyrosine phosphorylation of EGFR (pY(1173)), which was also blocked by AG1478. These results suggest that clusterin requires EGFR activation to deliver its mitogenic signal through the Ras/Raf-1/MEK/ERK signaling cascade in astrocytes.
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Karim RZ, Scolyer RA, Tse GM, Tan PH, Putti TC, Lee CS. Pathogenic mechanisms in the initiation and progression of mammary phyllodes tumours. Pathology 2009; 41:105-17. [DOI: 10.1080/00313020802579342] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Cold-inducible RNA-binding protein bypasses replicative senescence in primary cells through extracellular signal-regulated kinase 1 and 2 activation. Mol Cell Biol 2009; 29:1855-68. [PMID: 19158277 DOI: 10.1128/mcb.01386-08] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Embryonic stem cells are immortalized cells whose proliferation rate is comparable to that of carcinogenic cells. To study the expression of embryonic stem cell genes in primary cells, genetic screening was performed by infecting mouse embryonic fibroblasts (MEFs) with a cDNA library from embryonic stem cells. Cold-inducible RNA-binding protein (CIRP) was identified due to its ability to bypass replicative senescence in primary cells. CIRP enhanced extracellular signal-regulated kinase 1 and 2 (ERK1/2) phosphorylation, and treatment with an MEK inhibitor decreased the proliferation caused by CIRP. In contrast to CIRP upregulation, CIRP downregulation decreased cell proliferation and resulted in inhibition of phosphorylated ERK1/2 inhibition. This is the first evidence that ERK1/2 activation, through the same mechanism as that described for a Val12 mutant K-ras to induce premature senescence, is able to bypass senescence in the absence of p16(INK4a), p21(WAF1), and p19(ARF) upregulation. Moreover, these results show that CIRP functions by stimulating general protein synthesis with the involvement of the S6 and 4E-BP1 proteins. The overall effect is an increase in kinase activity of the cyclin D1-CDK4 complex, which is in accordance with the proliferative capacity of CIRP MEFs. Interestingly, CIRP mRNA and protein were upregulated in a subgroup of cancer patients, a finding that may be of relevance for cancer research.
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Lee MY, Jeong WJ, Oh JW, Choi KY. NM23H2 inhibits EGF- and Ras-induced proliferation of NIH3T3 cells by blocking the ERK pathway. Cancer Lett 2008; 275:221-6. [PMID: 19022560 DOI: 10.1016/j.canlet.2008.10.018] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2008] [Revised: 10/14/2008] [Accepted: 10/14/2008] [Indexed: 11/25/2022]
Abstract
The NM23 family proteins are involved in a variety of biological processes including tumor metastasis, development, and differentiation; however, their functions in the regulation of cellular proliferation are poorly understood. We have investigated the role of one NM23 family protein, NM23H2, in the regulation of cellular proliferation directed by the extracellular signal regulated kinase (ERK) pathway. The activity of ERKs was enhanced by knockdown of endogenous NM23H2 and blocked by overexpression of NM23H2 in both NIH3T3 and HEK293 cells. Additionally, the epidermal growth factor (EGF)- and oncogenic Ras(G12R)-induced proliferation of both HEK293 and NIH3T3 cells was reduced by NM23H2 overexpression. Furthermore, activation of Raf-1, MEK and the ERKs by either EGF or Ras(G12R) was inhibited by NM23H2 overexpression. Together, our data indicate that NM23H2 is a negative regulator of cellular proliferation stimulated by EGF- and Ras-mediated activation of the ERK pathway.
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Affiliation(s)
- Mi-Young Lee
- Department of Biotechnology, Protein Network Research Center, Yonsei University, 134 Shinchon-Dong, Seodemun-Gu, Seoul, Republic of Korea
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Abstract
There are four members of the EGFR family: EGFR, erbB2, erbB3 and erbB4. These receptors form ligand-activated oligomers which regulate intracellular processes via an oligomeric tyrosine kinase scaffold. The receptors are activated when the extracellular domain undergoes a conformational change which facilitates either homo- or hetero-oligomerization with other family members. The absence of one EGFR family member leads to embryonic or early post-natal death due to implantation, central nervous system or cardiac defects. Many mouse models of defective or deficient EGFR family members are available for studying physiology and/or pathology of EGFR family members. Sophisticated antibody and kinase inhibitors which target different family members have been designed, produced. EGFR and erbB2 are frequently activated, over expressed or mutated in many common cancers and the antagonists and/or inhibitors of EGFR and/or erbB2 signalling have already been shown to have therapeutic benefits for cancer patients.
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Affiliation(s)
- Antony W Burgess
- Ludwig Institute for cancer Research, Melbourne, Victoria, Australia.
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Wnt signaling is required for organization of the lens fiber cell cytoskeleton and development of lens three-dimensional architecture. Dev Biol 2008; 324:161-76. [PMID: 18824165 DOI: 10.1016/j.ydbio.2008.09.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Revised: 09/03/2008] [Accepted: 09/03/2008] [Indexed: 12/12/2022]
Abstract
How an organ develops its characteristic shape is a major issue. This is particularly critical for the eye lens as its function depends on having appropriately ordered three-dimensional cellular architecture. Recent in vitro studies indicate that Wnt signaling plays key roles in regulating morphological events in FGF-induced fiber cell differentiation in the mammalian lens. To further investigate this the Wnt signaling antagonist, secreted frizzled-related protein 2 (Sfrp2), was overexpressed in lens fiber cells of transgenic mice. In these mice fiber cell elongation was attenuated and individual fibers exhibited irregular shapes and consequently did not align or pack regularly; microtubules, microfilaments and intermediate filaments were clearly disordered in these fibers. Furthermore, a striking feature of transgenic lenses was that fibers did not develop the convex curvature typically seen in normal lenses. This appears to be related to a lack of protrusive processes that are required for directed migratory activity at their apical and basal tips as well as for the formation of interlocking processes along their lateral margins. Components of the Wnt/Planar Cell Polarity (PCP) pathway were downregulated or inhibited. Taken together this supports a role for Wnt/PCP signaling in orchestrating the complex organization and dynamics of the fiber cell cytoskeleton.
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Scardigli R, Gargioli C, Tosoni D, Borello U, Sampaolesi M, Sciorati C, Cannata S, Clementi E, Brunelli S, Cossu G. Binding of sFRP-3 to EGF in the extra-cellular space affects proliferation, differentiation and morphogenetic events regulated by the two molecules. PLoS One 2008; 3:e2471. [PMID: 18560570 PMCID: PMC2424011 DOI: 10.1371/journal.pone.0002471] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2007] [Accepted: 05/13/2008] [Indexed: 12/05/2022] Open
Abstract
Background sFRP-3 is a soluble antagonist of Wnts, widely expressed in developing embryos. The Wnt gene family comprises cysteine-rich secreted ligands that regulate cell proliferation, differentiation, organogenesis and oncogenesis of different organisms ranging from worms to mammals. In the canonical signal transduction pathway Wnt proteins bind to the extracellular domain of Frizzled receptors and consequently recruit Dishevelled (Dsh) to the cell membrane. In addition to Wnt membrane receptors belonging to the Frizzled family, several other molecules have been described which share homology in the CRD domain and lack the putative trans-membrane domain, such as sFRP molecules (soluble Frizzled Related Protein). Among them, sFRP-3 was originally isolated from bovine articular cartilage and also as a component of the Spemann organizer. sFRP-3 blocks Wnt-8 induced axis duplication in Xenopus embryos and binds to the surface of cells expressing a membrane-anchored form of Wnt-1. Injection of sFRP-3 mRNA blocks expression of XMyoD mRNA and leads to embryos with enlarged heads and shortened trunks. Methodology/Principal Findings Here we report that sFRP-3 specifically blocks EGF-induced fibroblast proliferation and foci formation. Over-expression of sFRP-3 reverts EGF-mediated inhibition of hair follicle development in the mouse ectoderm while its ablation in Xenopus maintains EGF-mediated inhibition of ectoderm differentiation. Conversely, over-expression of EGF reverts the inhibition of somitic myogenesis and axis truncation in Xenopus and mouse embryos caused by sFRP-3. In vitro experiments demonstrated a direct binding of EGF to sFRP-3 both on heparin and on the surface of CHO cells where the molecule had been membrane anchored. Conclusions/Significance sFRP-3 and EGF reciprocally inhibit their effects on cell proliferation, differentiation and morphogenesis and indeed are expressed in contiguous domains of the embryo, suggesting that in addition to their canonical ligands (Wnt and EGF receptor, respectively) these molecules bind to each other and regulate their activities during embryogenesis.
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Affiliation(s)
- Raffaella Scardigli
- Department of Developmental Biology, Institute of Cell Biology and Tissue Engineering, San Raffaele Biomedical Science Park of Rome, Rome, Italy
- Department of Histology and Medical Embryology, II° Medical School, University of Rome “La Sapienza”, Rome, Italy
| | - Cesare Gargioli
- Department of Developmental Biology, Institute of Cell Biology and Tissue Engineering, San Raffaele Biomedical Science Park of Rome, Rome, Italy
- Department of Histology and Medical Embryology, II° Medical School, University of Rome “La Sapienza”, Rome, Italy
| | - Daniela Tosoni
- Department of Histology and Medical Embryology, II° Medical School, University of Rome “La Sapienza”, Rome, Italy
| | - Ugo Borello
- Department of Histology and Medical Embryology, II° Medical School, University of Rome “La Sapienza”, Rome, Italy
- Stem Cell Research Institute, H. “S. Raffaele”, Milan, Italy
| | - Maurilio Sampaolesi
- Department of Experimental Medicine, University of Pavia, Pavia, Italy
- Interdepartemental Stem Cell Research Institute, University Hospital Gasthuisberg, Leuven, Belgium
| | - Clara Sciorati
- Stem Cell Research Institute, H. “S. Raffaele”, Milan, Italy
| | - Stefano Cannata
- Department of Biology, University of Tor Vergata, Rome, Italy
| | - Emilio Clementi
- Stem Cell Research Institute, H. “S. Raffaele”, Milan, Italy
- Department of Preclinical Sciences, University of Milan, and E. Medea Scientific Institute, Milan, Italy
| | - Silvia Brunelli
- Stem Cell Research Institute, H. “S. Raffaele”, Milan, Italy
- Department of Experimental Medicine, University of Milan-Bicocca, Monza (Milan), Italy
| | - Giulio Cossu
- Department of Developmental Biology, Institute of Cell Biology and Tissue Engineering, San Raffaele Biomedical Science Park of Rome, Rome, Italy
- Stem Cell Research Institute, H. “S. Raffaele”, Milan, Italy
- Department of Biology, University of Milan, Milan, Italy
- * E-mail:
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Abstract
In most colorectal tumours, APC mutation stabilises β-catenin and mimics elements of Wnt growth factor signalling, but the high frequency of epigenetic loss of Wnt antagonists indicates an additional role for ligand-mediated Wnt signalling. Here, we have investigated the expression of key components of β-catenin-independent Wnt response pathways to determine whether their profiles change during the transition from normal mucosa to colorectal adenomas. Transcription of the Wnt/planar cell polarity pathway determinant NKD1 (naked cuticle homologue 1) was induced in adenomas by a median 135-fold and in cancers by 7.4-fold. While some Frizzleds (FZDs) were downregulated in adenomas, the Wnt/Ca2+ receptors FZD3 and FZD6 were induced by a median factor of 6.5 and 4.6, respectively. Naked cuticle homologue 1, FZD3 and FZD6 expression were coordinated in pre-malignant disease, but this relationship was lost in invasive cancers, where FZD induction was seen less frequently. Naked cuticle homologue 1 expression was associated with nuclear localisation of phospho-c-Jun in adenomas. In cultured cells, NKD1 transcription was induced by lithium chloride but FZD3 expression required Wnt growth factor treatment. These data show that Wnt responses are consistently directed towards both β-catenin-independent routes in early colorectal tumorigenesis and elements of this are retained in more advanced cancers. These β-catenin-independent Wnt signalling pathways may provide novel targets for chemoprevention of early colorectal tumours.
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Schlange T, Matsuda Y, Lienhard S, Huber A, Hynes NE. Autocrine WNT signaling contributes to breast cancer cell proliferation via the canonical WNT pathway and EGFR transactivation. Breast Cancer Res 2008; 9:R63. [PMID: 17897439 PMCID: PMC2242658 DOI: 10.1186/bcr1769] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2007] [Revised: 09/19/2007] [Accepted: 09/26/2007] [Indexed: 12/02/2022] Open
Abstract
Background De-regulation of the wingless and integration site growth factor (WNT) signaling pathway via mutations in APC and Axin, proteins that target β-catenin for destruction, have been linked to various types of human cancer. These genetic alterations rarely, if ever, are observed in breast tumors. However, various lines of evidence suggest that WNT signaling may also be de-regulated in breast cancer. Most breast tumors show hypermethylation of the promoter region of secreted Frizzled-related protein 1 (sFRP1), a negative WNT pathway regulator, leading to downregulation of its expression. As a consequence, WNT signaling is enhanced and may contribute to proliferation of human breast tumor cells. We previously demonstrated that, in addition to the canonical WNT/β-catenin pathway, WNT signaling activates the extracellular signal-regulated kinase 1/2 (ERK1/2) pathway in mouse mammary epithelial cells via epidermal growth factor receptor (EGFR) transactivation. Methods Using the WNT modulator sFRP1 and short interfering RNA-mediated Dishevelled (DVL) knockdown, we interfered with autocrine WNT signaling at the ligand-receptor level. The impact on proliferation was measured by cell counting, YOPRO, and the MTT (3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyl-tetrazolium bromide) assay; β-catenin, EGFR, ERK1/2 activation, and PARP (poly [ADP-ribose]polymerase) cleavages were assessed by Western blotting after treatment of human breast cancer cell lines with conditioned media, purified proteins, small-molecule inhibitors, or blocking antibodies. Results Phospho-DVL and stabilized β-catenin are present in many breast tumor cell lines, indicating autocrine WNT signaling activity. Interfering with this loop decreases active β-catenin levels, lowers ERK1/2 activity, blocks proliferation, and induces apoptosis in MDA-MB-231, BT474, SkBr3, JIMT-1, and MCF-7 cells. The effects of WNT signaling are mediated partly by EGFR transactivation in human breast cancer cells in a metalloprotease- and Src-dependent manner. Furthermore, Wnt1 rescues estrogen receptor-positive (ER+) breast cancer cells from the anti-proliferative effects of 4-hydroxytamoxifen (4-HT) and this activity can be blocked by an EGFR tyrosine kinase inhibitor. Conclusion Our data show that interference with autocrine WNT signaling in human breast cancer reduces proliferation and survival of human breast cancer cells and rescues ER+ tumor cells from 4-HT by activation of the canonical WNT pathway and EGFR transactivation. These findings suggest that interference with WNT signaling at the ligand-receptor level in combination with other targeted therapies may improve the efficiency of breast cancer treatments.
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Affiliation(s)
- Thomas Schlange
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland
| | - Yutaka Matsuda
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland
| | - Susanne Lienhard
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland
| | - Alexandre Huber
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland
- Université de Genève, Département de biologie moléculaire, Sciences II, 30 quai Ernest-Ansermet, CH-1211 Genève 4, Switzerland
| | - Nancy E Hynes
- Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland
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Zhang H, Lee JM, Wang Y, Dong L, Ko KWS, Pelletier L, Yao Z. Mutational analysis of the FXNPXY motif within LDL receptor-related protein 1 (LRP1) reveals the functional importance of the tyrosine residues in cell growth regulation and signal transduction. Biochem J 2008; 409:53-64. [PMID: 17908054 DOI: 10.1042/bj20071127] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
LRP1 [LDL (low-density lipoprotein) receptor-related protein 1]-null CHO cells (Chinese-hamster ovary cells) (13-5-1 cells) exhibited accelerated cell growth and severe tumour progression after they were xenografted into nude mice. Reconstitution of LRP1 expression in these cells, either with the full-length protein or with a minireceptor, reduced growth rate as well as suppressed tumour development. We tested the role of the tyrosine residue in the FXNPXY63 motif within the LRP1 cytoplasmic domain in signal transduction and cell growth inhibition by site-specific mutagenesis. The LRP1 minireceptors harbouring Tyr63 to alanine or Tyr63 to phenylalanine substitution had diametrically opposite effects on cell growth, cell morphology and tumour development in mice. The Y63F-expressing cells showed suppressed cell growth and tumour development, which were associated with decreased beta-catenin and cadherin concentrations in the cells. On the other hand, the Y63A-expressing cells lacked inhibition on cell growth and tumour development, which were associated with hyperactivation of ERKs (extracellular-signal-regulated kinases), FAK (focal adhesion kinase) and cyclin D1 in the cells. The mutant Y63A minireceptor also exhibited reduced capacity in binding to the Dab2 (disabled 2) adaptor protein. In addition, the Y63A mutant showed increased caveolar localization, and cells expressing Y63A had altered caveolae architecture. However, tyrosine to alanine substitution at the other NPXY29 motif had no effect on cell growth or tumorigenesis. These results suggest that the FXNPXY63 motif of LRP1 not only governs cellular localization of the receptor but also exerts multiple functional effects on signalling pathways involved in cell growth regulation.
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Affiliation(s)
- Hongyu Zhang
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada K1H 8M5
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Force T, Woulfe K, Koch WJ, Kerkelä R. Molecular Scaffolds Regulate Bidirectional Crosstalk Between Wnt and Classical Seven-Transmembrane Domain Receptor Signaling Pathways. ACTA ACUST UNITED AC 2007; 2007:pe41. [PMID: 17666710 DOI: 10.1126/stke.3972007pe41] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Signaling downstream of classical seven-transmembrane domain receptors (7TMRs) had generally been thought to recruit factors that are in large part separate from those recruited by atypical 7TMRs, such as Frizzleds (Fzs), receptors for the Wnt family of glycoproteins. Classical 7TMRs are also known as G protein-coupled receptors (GPCRs) and are mediated by signaling factors such as heterotrimeric guanine nucleotide-binding proteins (G proteins), GPCR kinases (GRKs), and beta-arrestins. Over the past few years, it has become increasingly apparent that classical and atypical 7TMRs share these factors, which are often associated with mediating classical 7TMR signaling, as well as the scaffolding proteins that were initially thought to be involved in transmitting atypical 7TMR signals. This sharing of signaling components by agonists that bind classical 7TMRs and those binding to atypical 7TMRs establishes the possibility of extensive crosstalk between these receptor classes. We discuss the evidence for, and against, crosstalk, and examine mechanisms by which this can occur.
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Affiliation(s)
- Thomas Force
- The Center for Translational Medicine, Thomas Jefferson University, Philadelphia, PA 19107, USA.
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