1
|
Castillo S, Gence R, Pagan D, Koraïchi F, Bouchenot C, Pons BJ, Boëlle B, Olichon A, Lajoie-Mazenc I, Favre G, Pédelacq JD, Cabantous S. Visualizing the subcellular localization of RHOB-GTP and GTPase-Effector complexes using a split-GFP/nanobody labelling assay. Eur J Cell Biol 2023; 102:151355. [PMID: 37639782 DOI: 10.1016/j.ejcb.2023.151355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Revised: 08/04/2023] [Accepted: 08/20/2023] [Indexed: 08/31/2023] Open
Abstract
Small GTPases are highly regulated proteins that control essential signaling pathways through the activity of their effector proteins. Among the RHOA subfamily, RHOB regulates peculiar functions that could be associated with the control of the endocytic trafficking of signaling proteins. Here, we used an optimized assay based on tripartite split-GFP complementation to localize GTPase-effector complexes with high-resolution. The detection of RHOB interaction with the Rhotekin Rho binding domain (RBD) that specifically recognizes the active GTP-bound GTPase, is performed in vitro by the concomitant addition of recombinant GFP1-9 and a GFP nanobody. Analysis of RHOB-RBD complexes localization profiles combined with immunostaining and live cell imaging indicated a serum-dependent reorganization of the endosomal and membrane pool of active RHOB. We further applied this technology to the detection of RHO-effector complexes that highlighted their subcellular localization with high resolution among the different cellular compartments.
Collapse
Affiliation(s)
- Sebastian Castillo
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Rémi Gence
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Delphine Pagan
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Faten Koraïchi
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | | | - Benoit J Pons
- Environment and Sustainability Institute, Biosciences, University of Exeter, Penryn TR10 9FE, United Kingdom
| | - Betty Boëlle
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Aurélien Olichon
- Université de la Réunion, INSERM, UMR 1188 Diabète Athérothrombose Thérapies Réunion Océan Indien (DéTROI), 97410 Saint-Pierre, La Réunion, France
| | - Isabelle Lajoie-Mazenc
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Gilles Favre
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France
| | - Jean-Denis Pédelacq
- Institut de Pharmacologie et de Biologie Structurale (IPBS), Université de Toulouse, CNRS, Université Toulouse III - Paul Sabatier (UPS), Toulouse, France
| | - Stéphanie Cabantous
- Centre de Recherche en Cancérologie de Toulouse (CRCT), INSERM, Université de Toulouse, UPS, CNRS, 31037 Toulouse, France.
| |
Collapse
|
2
|
Jiao P, Wang J, Yang J, Wang X, Luoreng Z. Bta-miR-223 Targeting the RHOB Gene in Dairy Cows Attenuates LPS-Induced Inflammatory Responses in Mammary Epithelial Cells. Cells 2022; 11:cells11193144. [PMID: 36231106 PMCID: PMC9563457 DOI: 10.3390/cells11193144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 09/30/2022] [Accepted: 10/04/2022] [Indexed: 01/09/2023] Open
Abstract
Bovine mammary epithelial cells (bMECs) are part of the first line of defense against pathogens. In recent studies, bta-miR-223 has been reported to activate congenital and innate immunity against inflammatory damage during the pathogenesis of mastitis in dairy cows. The purpose of this study was to identify the regulatory mechanism of bta-miR-223 and its downstream target genes in inflammatory bMECs. A double luciferase reporter gene assay demonstrated that ras homolog family member B (RHOB) was the target gene of bta-miR-223. To further elucidate the role of bta-miR-223 in congenital immune responses, bta-miR-223 mimics (mimic/inhibitor) were transfected into bMECs stimulated with lipopolysaccharide (LPS), which activates the Toll-like receptor 4/nuclear factor-κB (TLR4/NF-κB) signaling pathway. Real-time quantitative PCR (qPCR) and Western blot were used to detect the expression of related genes and proteins, and enzyme-linked immunosorbent assay (ELISA) was used to detect secreted inflammatory factors. Results showed that bta-miR-223 expression during inflammation in bMECs reduced the secretion of inflammatory factors by targeting RHOB and deactivation of NF-κB gene activity. Silencing RHOB inhibited LPS-induced inflammatory response in bMECs. Overall, bta-miR-223 attenuated LPS-induced inflammatory response, and acted as a negative feedback regulator via targeting RHOB, providing a novel avenue for mastitis treatment.
Collapse
Affiliation(s)
- Peng Jiao
- School of Agriculture, Ningxia University, Yinchuan 750021, China; (P.J.); (J.W.); (J.Y.); (X.W.)
- Key Laboratory of Ruminant Molecular Cell Breeding, Ningxia Hui Autonomous Region, Yinchuan 750021, China
| | - Jinpeng Wang
- School of Agriculture, Ningxia University, Yinchuan 750021, China; (P.J.); (J.W.); (J.Y.); (X.W.)
- Key Laboratory of Ruminant Molecular Cell Breeding, Ningxia Hui Autonomous Region, Yinchuan 750021, China
| | - Jian Yang
- School of Agriculture, Ningxia University, Yinchuan 750021, China; (P.J.); (J.W.); (J.Y.); (X.W.)
- Key Laboratory of Ruminant Molecular Cell Breeding, Ningxia Hui Autonomous Region, Yinchuan 750021, China
| | - Xingping Wang
- School of Agriculture, Ningxia University, Yinchuan 750021, China; (P.J.); (J.W.); (J.Y.); (X.W.)
- Key Laboratory of Ruminant Molecular Cell Breeding, Ningxia Hui Autonomous Region, Yinchuan 750021, China
| | - Zhuoma Luoreng
- School of Agriculture, Ningxia University, Yinchuan 750021, China; (P.J.); (J.W.); (J.Y.); (X.W.)
- Key Laboratory of Ruminant Molecular Cell Breeding, Ningxia Hui Autonomous Region, Yinchuan 750021, China
- Correspondence: ; Tel.: +86-0951-2061874
| |
Collapse
|
3
|
Abstract
BACKGROUND: Hepatocellular carcinoma (HCC) is the leading cause of mortality worldwide. In recent years, the incidence of HCC induced by NAFLD is growing rapidly. OBJECTIVE: To screen for new pathogenic genes and related pathways both in NAFLD and HCC, and to explore the pathogenesis of progression from NAFLD to HCC. METHODS: Gene expression microarrays (GSE74656, GSE62232) were used for identifying differentially expressed genes (DEGs). Functional enrichment and pathway enrichment analyses indicated that these DEGs were related to cell cycle and extracellular exosome, which were closely related to NAFLD and HCC development. We then used the Search Tool for the Retrieval of Interacting Genes (STRING) to establish the protein-protein interaction (PPI) network and visualized them in Cytoscape. And the overall survival (OS) analysis and gene expression validation in TCGA of hub genes was performed. RESULTS: Seven hub genes, including CDK1, HSP90AA1, MAD2L1, PRKCD, ITGB3BP, CEP192, and RHOB were identified. Finally, we verified the expression level of ITGB3BP and CEP192 by quantitative real-time PCR in vitro. CONCLUSIONS: The present study implied possible DEGs, especially the new gene CEP192, in the progression of NAFLD developing to HCC. Further rigorous experiments are required to verify the above results.
Collapse
Affiliation(s)
| | | | - Chaohui Yu
- Corresponding author: Chaohui Yu, The First Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang, China. E-mail:
| |
Collapse
|
4
|
Zhang K, Liu Y, Liu X, Peng M, Liu J, Zhang Q. A functional polymorphism in the promoter of RhoB is associated with susceptibility to Vibrio anguillarum in turbot (Scophthalmus maximus). Fish Shellfish Immunol 2019; 93:269-277. [PMID: 31306762 DOI: 10.1016/j.fsi.2019.07.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 07/03/2019] [Accepted: 07/11/2019] [Indexed: 06/10/2023]
Abstract
As an isoform of Rho family GTPases, RhoB plays a pivotal role in cytoskeletal organization, cell proliferation, apoptosis and immune response. However, the regulatory mechanisms of RhoB expression in aquatic animals are still unknown. In the present study, we first construct Vibrio anguillarum infection model in S. maximus, including susceptible and resistant individuals. Then the temporal expression of RhoB was detected after V. anguillarum challenge using qRT-PCR and found that RhoB transcripts were significantly induced in the liver, gill and blood despite of differential expression levels and responsive time points. In addition, the mRNA levels of RhoB in resistant individuals were significantly higher than in susceptible ones. The length of 2083 bp sequences of RhoB promoter was cloned and characterized. Moreover, DNA methylation of the RhoB promoter was measured by bisulfite sequencing (BSP) and hypo-methylated was detected in the CpG islands. Three SNPs (-1590, -1575 and -1449) and two haplotypes in the promoter region of RhoB were identified to be associated with V. anguillarum resistance in turbot by association analysis in group 17-R and 17-S. Deletion analysis indicated that these SNPs could negatively mediate the activity of RhoB promoter. Site-directed mutagenesis and qRT-PCR of individuals with different genotypes demonstrated that -1575 T/A polymorphism affected promoter activity. Further study showed that this mutation altered the binding site of the transcription factor CREB. Co-transfection of SmCREB and RhoB promoter was performed in HEK293T cells which confirmed the -1575 allelic differences on transcriptional activity, with the susceptibility allele showing reduced activity. Taken together, our findings implicate that losing of binding of CREB to SmRhoB promoter due to -1575T/A polymorphisms enhances SmRhoB expression in resistant turbot, which provide insights into the effect of SmRhoB expression in response to V. anguillarum infection.
Collapse
Affiliation(s)
- Kai Zhang
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China
| | - Yuxiang Liu
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China
| | - Xiumei Liu
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China; College of Life Sciences, Yantai University, Yantai, 264005, China
| | - Meiting Peng
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China
| | - Jinxiang Liu
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China
| | - Quanqi Zhang
- Key Laboratory of Marine Genetics and Breeding, Ministry of Education, Ocean University of China, Qingdao, 266003, China; Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266237, China.
| |
Collapse
|
5
|
Li Z, Li Y, Wang Y. miR-19a promotes invasion and epithelial to mesenchymal transition of bladder cancer cells by targeting RhoB. J BUON 2019; 24:797-804. [PMID: 31128038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
PURPOSE Bladder cancer is one of the most frequent carcinomas worldwide, the incidence of which ranks fourth in males. MiR-19a is identified as one of the key miRs associated with tumorigenesis and has been documented to act as an oncogene in various types of tumors. The aim of this study was to explore the effects of miR-19a and RhoB in bladder cancer. METHODS The expression of miR-19a was analyzed from 54 paired of bladder cancer and paracancer tissues by real-time quantitative polymerase chain reaction (RT-qPCR). Transwell assay was employed to confirm the invasion capacity in bladder cancer. Dual luciferase reporter assay was utilized to analyze the association between the expression of miR-19a and RhoB. Western blot analyses were performed to detect the relative protein expression. RESULTS miR-19a was clearly overexpressed in bladder cancer tissues and cells, while the expression of RhoB was lower in bladder cancer tissues and cells as compared with corresponding paracancer tissues and normal bladder cells. Also, miR-19a could promote the invasion and epithelial-mesenchymal transition (EMT) of bladder cancer cells through inhibiting the expression of RhoB. Moreover RhoB was identified as a direct target of miR-19a and the inverse relationship between them was also observed. CONCLUSIONS This data demonstrated that miR-19a promoted the invasion and EMT through targeting RhoB. It is suggested that miR-19a/RhoB axis may show a new way for the treatment of bladder cancer.
Collapse
Affiliation(s)
- Zongwu Li
- Department of Urology, Jinan Central Hospital Affiliated to Shandong University, Jinan 250013, China
| | | | | |
Collapse
|
6
|
García-Mariscal A, Li H, Pedersen E, Peyrollier K, Ryan KM, Stanley A, Quondamatteo F, Brakebusch C. Loss of RhoA promotes skin tumor formation and invasion by upregulation of RhoB. Oncogene 2018; 37:847-860. [PMID: 29059167 DOI: 10.1038/onc.2017.333] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 07/26/2017] [Accepted: 08/12/2017] [Indexed: 02/06/2023]
Abstract
Cellular movement is controlled by small GTPases, such as RhoA. Although migration is crucial for cancer cell invasion, the specific role of RhoA in tumor formation is unclear. Inducing skin tumors in mice with a keratinocyte-restricted loss of RhoA, we observed increased tumor frequency, growth and invasion. In vitro invasion assays revealed that in the absence of RhoA cell invasiveness is increased in a Rho-associated protein kinase (ROCK) activation and cell contraction-dependent manner. Surprisingly, loss of RhoA causes increased Rho signaling via overcompensation by RhoB because of reduced lysosomal degradation of RhoB in Gamma-aminobutyric acid receptor-associated protein (GABARAP)+ autophagosomes and endosomes. In the absence of RhoA, RhoB relocalized to the plasma membrane and functionally replaced RhoA with respect to invasion, clonogenic growth and survival. Our data demonstrate for the first time that RhoA is a tumor suppressor in 7,12-dimethylbenz[a]anthracene/12-O-tetradecanoylphorbol 13-acetate skin carcinogenesis and identify Rho signaling dependent on RhoA and RhoB as a potent driver of tumor progression.
Collapse
Affiliation(s)
- A García-Mariscal
- Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Copenhagen, Denmark
| | - H Li
- Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Copenhagen, Denmark
| | - E Pedersen
- Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Copenhagen, Denmark
| | - K Peyrollier
- Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Copenhagen, Denmark
| | | | - A Stanley
- Skin and Extracellular Matrix Research Group, Anatomy, NUI, Galway, Ireland
| | - F Quondamatteo
- Skin and Extracellular Matrix Research Group, Anatomy, NUI, Galway, Ireland
| | - C Brakebusch
- Biotech Research and Innovation Centre, BRIC, University of Copenhagen, Copenhagen, Denmark
| |
Collapse
|
7
|
Nomikou E, Stournaras C, Kardassis D. Functional analysis of the promoters of the small GTPases RhoA and RhoB in embryonic stem cells. Biochem Biophys Res Commun 2017; 491:754-759. [PMID: 28739254 DOI: 10.1016/j.bbrc.2017.07.114] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Accepted: 07/20/2017] [Indexed: 01/01/2023]
Abstract
Small GTPases of the Rho subfamily have been implicated in many physiological and pathological processes in various cell types including embryonic stem cells (ESCs). In the present study we performed a functional analysis of the promoters of the RhoA and the RhoB genes in order to identify regulatory elements that are important for their transcriptional control in ESCs. We show that RhoA mRNA levels were significantly higher compared with the RhoB mRNA levels in ESCs as well in various cancer cell lines and this difference could be accounted for by differences in the activities of the corresponding promoters. Deletion analysis of the RhoA and RhoB promoters in ESCs revealed that the proximal regions contain regulatory elements that are critical for their activity. Both proximal promoters contain CCAAT boxes and mutagenesis of these elements decreased significantly the activity of both promoters suggesting a coordinated regulation of the two genes by CCAAT box binding factors. Finally, we show that both genes are subjects to autoregulation in ESCs and in the case of RhoB, this autoregulation requires the GTPase activity of the Rho proteins. Understanding the mechanisms that control the transcription of Rho GTPases in ESCs may shed new light into the still unknown roles of these proteins in stem cell functions.
Collapse
Affiliation(s)
- Eirini Nomikou
- Laboratory of Biochemistry, Division of Basic Medical Sciences, University of Crete Medical School, Heraklion 71003, Greece
| | - Christos Stournaras
- Laboratory of Biochemistry, Division of Basic Medical Sciences, University of Crete Medical School, Heraklion 71003, Greece
| | - Dimitris Kardassis
- Laboratory of Biochemistry, Division of Basic Medical Sciences, University of Crete Medical School, Heraklion 71003, Greece; Institute of Molecular Biology and Biotechnology, Foundation for Research and Technology of Hellas, Heraklion 71003, Greece.
| |
Collapse
|
8
|
Diao F, Chen K, Wang Y, Li Y, Xu W, Lu J, Chen YX. Involvement of small G protein RhoB in the regulation of proliferation, adhesion and migration by dexamethasone in osteoblastic cells. PLoS One 2017; 12:e0174273. [PMID: 28323887 PMCID: PMC5360316 DOI: 10.1371/journal.pone.0174273] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Accepted: 03/06/2017] [Indexed: 12/02/2022] Open
Abstract
Long-term exposure to therapeutic doses of glucocorticoids (GCs) results in bone remodeling, which frequently causes osteoporosis and fracture healing retardation because of the abnormality of osteoblastic proliferation and differentiation. The mechanisms of GCs’ effect on osteoblasts are largely unknown. In this present study, we found that dexamethasone (Dex) could induce the expression of the small G protein, RhoB, in mRNA and protein levels in the osteoblast-derived osteosarcoma cell lines MG-63. The up-regulation of RhoB mRNA by Dex mainly occurs at posttranscriptional level by increasing its mRNA stability through PI-3K/Akt and p38 mitogen-activated protein kinase signaling pathways. Over-expression of RhoB in MG-63 cells magnified while down-regulation of RhoB level by RNA interference impaired Dex-induced growth inhibition but not differentiation. What’s more, over-expression of RhoB mimicked the effect of Dex on cell adhesion and migration. And interfering RhoB expression partially suppressed Dex-induced pro-adhesion and anti-migration in MG-63 cells. In conclusion, these results indicate that RhoB plays an important role in the pathological effect of Dex on osteoblastic growth and migration, which is a part of the mechanisms of GCs’ adverse effect on bone remodeling.
Collapse
Affiliation(s)
- Fei Diao
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Kangyao Chen
- Department of Orthopedics, Changhai Hospital affiliated to Second Military Medical University, Shanghai, China
- Department of -Orthopedics, Fuzhou Second Hospital affiliated to Xiamen University, Fuzhou, Fujian Province, China
| | - Yan Wang
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Yidong Li
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
| | - Weidong Xu
- Department of Orthopedics, Changhai Hospital affiliated to Second Military Medical University, Shanghai, China
| | - Jian Lu
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
- * E-mail: (JL); (YXC)
| | - Yu-Xia Chen
- Department of Pathophysiology, Second Military Medical University, Shanghai, China
- * E-mail: (JL); (YXC)
| |
Collapse
|
9
|
Xu X, Wang Y, Tian C, Liang Y. The Colletotrichum gloeosporioides RhoB regulates cAMP and stress response pathways and is required for pathogenesis. Fungal Genet Biol 2016; 96:12-24. [PMID: 27670809 DOI: 10.1016/j.fgb.2016.09.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 09/16/2016] [Accepted: 09/22/2016] [Indexed: 12/26/2022]
Abstract
Rho GTPases regulate morphology and multiple cellular functions such as asexual development, polarity establishment, and differentiation in fungi. To determine the roles of CgRhoB, a Rho GTPase protein, here we characterized CgRhoB in the poplar anthracnose fungus Colletotrichum gloeosporioides. First of all, we determined that conidial germination was inhibited and intracellular cyclic AMP (cAMP) level was increased in the CgRhoB deletion mutants. Loss of CgRhoB resulted in shorter germ tubes and enhanced appressoria formation after germination on the hydrophobic surface. Exogenous addition of cAMP to the wild type generated the similar phenotypes of ΔCgRhoB inoculated in CM liquid. Furthermore, deletion of CgRhoB had discernible effect upon the sensitivity of C. gloeosporioides to cell wall perturbing agents and altered the distribution of chitin on the cell wall. H2O2 sensitivity assay showed the hypersensitive effect on the oxidative stress, and transcriptional analysis revealed that transcription of genes involved in peroxidase activities was altered in the mutants. Finally, virulence assay revealed that CgRhoB was required for pathogenicity. Taken together, our results showed that CgRhoB was associated with appressoria formation and pathogenicity, and affected cAMP level and stress pathways.
Collapse
Affiliation(s)
- Xin Xu
- The Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forestry, Beijing Forestry University, Beijing, China
| | - Yonglin Wang
- The Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forestry, Beijing Forestry University, Beijing, China
| | - Chengming Tian
- The Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forestry, Beijing Forestry University, Beijing, China
| | - Yingmei Liang
- Museum of Beijing Forestry University, Beijing Forestry University, Beijing, China.
| |
Collapse
|
10
|
Rohrbeck A, Fühner V, Schröder A, Hagemann S, Vu XK, Berndt S, Hust M, Pich A, Just I. Detection and Quantification of ADP-Ribosylated RhoA/B by Monoclonal Antibody. Toxins (Basel) 2016; 8:100. [PMID: 27043630 PMCID: PMC4848626 DOI: 10.3390/toxins8040100] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 03/20/2016] [Accepted: 03/29/2016] [Indexed: 01/03/2023] Open
Abstract
Clostridium botulinum exoenzyme C3 is the prototype of C3-like ADP-ribosyltransferases that modify the GTPases RhoA, B, and C. C3 catalyzes the transfer of an ADP-ribose moiety from the co-substrate nicotinamide adenine dinucleotide (NAD) to asparagine-41 of Rho-GTPases. Although C3 does not possess cell-binding/-translocation domains, C3 is able to efficiently enter intact cells, including neuronal and macrophage-like cells. Conventionally, the detection of C3 uptake into cells is carried out via the gel-shift assay of modified RhoA. Since this gel-shift assay does not always provide clear, evaluable results an additional method to confirm the ADP-ribosylation of RhoA is necessary. Therefore, a new monoclonal antibody has been generated that specifically detects ADP-ribosylated RhoA/B, but not RhoC, in Western blot and immunohistochemical assay. The scFv antibody fragment was selected by phage display using the human naive antibody gene libraries HAL9/10. Subsequently, the antibody was produced as scFv-Fc and was found to be as sensitive as a commercially available RhoA antibody providing reproducible and specific results. We demonstrate that this specific antibody can be successfully applied for the analysis of ADP-ribosylated RhoA/B in C3-treated Chinese hamster ovary (CHO) and HT22 cells. Moreover, ADP-ribosylation of RhoA was detected within 10 min in C3-treated CHO wild-type cells, indicative of C3 cell entry.
Collapse
Affiliation(s)
- Astrid Rohrbeck
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Viola Fühner
- Biotechnology and Bioinformatics, Department of Biotechnology, Institute for Biochemistry, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany.
| | - Anke Schröder
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Sandra Hagemann
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Xuan-Khang Vu
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Sarah Berndt
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Michael Hust
- Biotechnology and Bioinformatics, Department of Biotechnology, Institute for Biochemistry, Technische Universität Braunschweig, Spielmannstr. 7, 38106 Braunschweig, Germany.
| | - Andreas Pich
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| | - Ingo Just
- Institute of Toxicology, Hannover Medical School, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
| |
Collapse
|
11
|
Abstract
Anaplastic thyroid carcinoma is a highly aggressive undifferentiated carcinoma with a mortality rate near 100% due to an assortment of genomic abnormalities which impede the success of therapeutic options. Our laboratory has previously identified that RhoB upregulation serves as a novel molecular therapeutic target and agents upregulating RhoB combined with paclitaxel lead to antitumor synergy. Knowing that histone deacetylase 1 (HDAC1) transcriptionally suppresses RhoB, we sought to extend our findings to other HDACs and to identify the HDAC inhibitor (HDACi) that optimally synergize with paclitaxel. Here we identify HDAC6 as a newly discovered RhoB repressor. By using isoform selective HDAC inhibitors (HDACi) and shRNAs, we show that RhoB has divergent downstream signaling partners, which are dependent on the HDAC isoform that is inhibited. When RhoB upregulates only p21 (cyclin kinase inhibitor) using a class I HDACi (romidepsin), cells undergo cytostasis. When RhoB upregulates BIMEL using class II/(I) HDACi (belinostat or vorinostat), apoptosis occurs. Combinatorial synergy with paclitaxel is dependent upon RhoB and BIMEL while upregulation of RhoB and only p21 blocks synergy. This bifurcated regulation of the cell cycle by RhoB is novel and silencing either p21 or BIMEL turns the previously silenced pathway on, leading to phenotypic reversal. This study intimates that the combination of belinostat/vorinostat with paclitaxel may prove to be an effective therapeutic strategy via the novel observation that class II/(I) HDACi antagonize HDAC6-mediated suppression of RhoB and subsequent BIMEL, thereby promoting antitumor synergy. These overall observations may provide a mechanistic understanding of optimal therapeutic response.
Collapse
Affiliation(s)
- Laura A Marlow
- Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA
| | - Ilah Bok
- Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA
| | - Robert C Smallridge
- Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA
| | - John A Copland
- Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA Departments of Cancer BiologyInternal MedicineDivision of EndocrinologyEndocrine Malignancy Working GroupMayo Clinic, 4500 San Pablo Road, Jacksonville, Florida 32224, USA
| |
Collapse
|
12
|
Vega FM, Thomas M, Reymond N, Ridley AJ. The Rho GTPase RhoB regulates cadherin expression and epithelial cell-cell interaction. Cell Commun Signal 2015; 13:6. [PMID: 25630770 PMCID: PMC4334914 DOI: 10.1186/s12964-015-0085-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 01/14/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The Rho GTPase RhoB has been proposed to be a tumor suppressor in cancer and is downregulated in various tumors including prostate. RhoB has different effects on cell migration depending on the cell type and conditions, but the molecular basis for this variability is unclear. RhoB regulates trafficking of membrane receptors and integrins. We have previously shown that RhoB depletion alters focal adhesion dynamics and reduces surface levels of β1 integrin in PC3 prostate cancer cells, correlating with increased migration speed. RESULTS Here we show that RhoB depletion reduces cell-cell adhesion and downregulates E-cadherin levels as well as increasing internalized E-cadherin in DU145 prostate cancer cells. This is accompanied by increased migration speed. RhoB localizes to cell-cell junctions together with E-cadherin in DU145 cells. RhoB depletion also reduces N-cadherin levels in PC3 cells, which do not express E-cadherin. CONCLUSIONS These results indicate that RhoB alters migration of cells with cell-cell adhesions by regulating cadherin levels. We propose that the relative contribution of integrins and cadherins to cell migration underlies the variable involvement for RhoB in this process and that the downregulation of RhoB in some epithelial cancers could contribute to the weakening of epithelial cell-cell junction during tumor progression.
Collapse
Affiliation(s)
- Francisco M Vega
- Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL, UK.
- Current address: Instituto de Biomedicina de Sevilla, Hospital Universitario Virgen del Rocío/CSIC/Universidad de Sevilla, Edificio IBiS, E-14013, Seville, Spain.
| | - Mairian Thomas
- Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL, UK.
| | - Nicolas Reymond
- Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL, UK.
| | - Anne J Ridley
- Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London, SE1 1UL, UK.
| |
Collapse
|
13
|
Ichijo S, Furuya F, Shimura H, Hayashi Y, Takahashi K, Ohta K, Kobayashi T, Kitamura K. Activation of the RhoB signaling pathway by thyroid hormone receptor β in thyroid cancer cells. PLoS One 2014; 9:e116252. [PMID: 25548921 PMCID: PMC4280201 DOI: 10.1371/journal.pone.0116252] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 12/05/2014] [Indexed: 11/19/2022] Open
Abstract
Thyroid hormone receptor (TR) mediates the crucial effects of the thyroid hormone (T3) on cellular growth, development, and differentiation. Decreased expression or inactivating somatic mutations of TRs have been found in human cancers of the liver, breast, lung, and thyroid. The mechanisms of TR-associated carcinogenesis are still not clear. To establish the function of TRβ in thyroid cancer cell proliferation, we constructed a recombinant adenovirus vector, AdTRβ, which expresses human TRβ1 cDNA. Thyroid cancer cell lines in which TRβ protein levels were significantly decreased as compared to intact thyroid tissues were infected with AdTRβ and the function of TRβ on cell proliferation and migration was analyzed. Ligand-bound TRβ induced HDAC1 and HDAC3 dissociation from, and histone acetylation associated with the RhoB promoter and enhanced the expression of RhoB mRNA and protein. In AdTRβ-infected cells, T3 and farnesyl transferase inhibitor (FTI)-treatment induced the distribution of RhoB on the cell membrane and enhanced the abundance of active GTP-bound RhoB. This RhoB protein led to p21-associated cell-cycle arrest in the G0/G1 phase, following inhibition of cell proliferation and invasion. Conversely, lowering cellular RhoB by small interfering RNA knockdown in AdTRβ-infected cells led to downregulation of p21 and inhibited cell-cycle arrest. The growth of BHP18-21v tumor xenografts invivo was significantly inhibited by AdTRβ injection with FTIs-treatment, as compared to control virus-injected tumors. This novel signaling pathway triggered by ligand-bound TRβ provides insight into possible mechanisms of proliferation and invasion of thyroid cancer and may provide new therapeutic targets for thyroid cancers.
Collapse
Affiliation(s)
- Sayaka Ichijo
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Fumihiko Furuya
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
- * E-mail:
| | - Hiroki Shimura
- Department of Laboratory Medicine, Fukushima Medical University, Fukushima, Japan
| | - Yoshitaka Hayashi
- Department of Endocrinology and Metabolism, Division of Molecular and Cellular Adaptation, Research Institute of Environmental Medicine, Nagoya University, Nagoya, Japan
| | - Kazuya Takahashi
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Kazuyasu Ohta
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Tetsuro Kobayashi
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| | - Kenichiro Kitamura
- Third Department of Internal Medicine, Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi, Yamanashi, Japan
| |
Collapse
|
14
|
Kamasani U, Prendergast GC. Genetic response to DNA damage: Proapoptotic targets of RhoB include modules for p53 response and susceptibility to alzheimer’s disease. Cancer Biol Ther 2014; 4:282-8. [PMID: 15876868 DOI: 10.4161/cbt.4.3.1498] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Knockout mouse studies indicate that the small GTPase RhoB is critical for apoptosis triggered by genotoxic stress in transformed mouse cells. However, the mechanisms used by RhoB to sensitize cells to cell death are obscure. To gain insight into this question, we compared the genetic response of cells with different rhoB genotypes to the DNA damaging anticancer drug doxorubicin (DOX). The microarray hybridization strategy focused on events occurring by 6 hr of DOX treatment, preceding the execution phase of RhoB-dependent apoptosis by 12-16 hr. Genes controlling cytoskeletal organization, adhesion, transcription, trafficking, apoptosis, and protein turnover were represented prominently. Gene clustering revealed a module of p53 target genes, suggesting that RhoB may modify the p53 response, and a module for susceptibility to Alzheimer's disease, suggesting a link between RhoB and age-associated dementia. The findings of this study suggest mechanisms by which RhoB may act to elevate the sensitivity of cells to apoptosis following genotoxic stress.
Collapse
Affiliation(s)
- Uma Kamasani
- The Lankenau Institute for Medical Research, Wynnewood, Pennsylvania, USA
| | | |
Collapse
|
15
|
Calvayrac O, Pradines A, Raymond-Letron I, Rouquette I, Bousquet E, Lauwers-Cances V, Filleron T, Cadranel J, Beau-Faller M, Casanova A, Milia J, Favre G, Mazières J. RhoB determines tumor aggressiveness in a murine EGFRL858R-induced adenocarcinoma model and is a potential prognostic biomarker for Lepidic lung cancer. Clin Cancer Res 2014; 20:6541-50. [PMID: 25320360 DOI: 10.1158/1078-0432.ccr-14-0506] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
PURPOSE A crucial event in lung adenocarcinoma progression is the switch from an aerogenous spread toward an infiltrating tumor. Loss of RhoB expression has been suggested to be critical for lung cancer invasion. Here, we tested RhoB expression as a prognostic biomarker in non-small cell lung cancer (NSCLC) with a special focus on lepidic pattern. EXPERIMENTAL DESIGN We analyzed RhoB expression using both IHC and RT-qPCR in two series of operated patients (n = 100 and 48, respectively) and in a series of advanced lepidic adenocarcinoma (n = 31) from different hospitals. Next, we examined the role of RhoB in lung cancer progression in transgenic mice that express inducible EGFR(L858R) crossed with Rhob null mice. RESULTS We identified that loss of RhoB expression was strongly associated with worse survival (P = 0.0001) and progression-free survival (P < 0.001) in the first series. We then confirmed these results after multivariate analyses of the second series. In the series of adenocarcinoma with lepidic features issued from a clinical trial (IFCT-0401), we showed that loss of RhoB expression was associated with higher aggressiveness of stage IV. Finally, we showed that EGFR(L858R)/Rhob(+/+) mice developed mainly diffuse lung tumors with a lepidic pattern, whereas EGFR(L858R)/Rhob(+/-) and EGFR(L858R)/Rhob(-/-) developed a greater number of tumors, and aggressive adenocarcinomas with invasive properties. CONCLUSIONS We showed that RhoB is not only a strong prognostic factor in NSCLC but it is also critical for the acquisition of an aggressive phenotype of adenocarcinoma.
Collapse
Affiliation(s)
- Olivier Calvayrac
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Institut Claudius Regaud, Toulouse, France
| | - Anne Pradines
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Institut Claudius Regaud, Toulouse, France
| | - Isabelle Raymond-Letron
- Université de Toulouse, UPS-INP-ENVT, UMS006, Laboratoire d'histopathologie, Toulouse, France
| | - Isabelle Rouquette
- Université Paul Sabatier, Toulouse, France. Hôpital Rangueil, Departement d'Anatomo-Cytopathologie, CHU Toulouse, Toulouse, France
| | - Emilie Bousquet
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Institut Claudius Regaud, Toulouse, France
| | | | | | - Jacques Cadranel
- Hôpital Tenon, Service de Pneumologie, AP-HP; GRC-UPMC 04 Theranoscan Paris 6 University, France
| | - Michèle Beau-Faller
- Hôpital de Hautepierre, Pôle de Biologie, Laboratoire de Biochimie et Biologie Moléculaire, CHU Strasbourg, Strasbourg cedex, France
| | - Anne Casanova
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Institut Claudius Regaud, Toulouse, France
| | - Julie Milia
- Université Paul Sabatier, Toulouse, France. Hôpital Larrey, Département de Pneumologie, CHU Toulouse, Toulouse, France
| | - Gilles Favre
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Institut Claudius Regaud, Toulouse, France.
| | - Julien Mazières
- Inserm, UMR 1037-CRCT, Toulouse, France. Université Paul Sabatier, Toulouse, France. Hôpital Larrey, Département de Pneumologie, CHU Toulouse, Toulouse, France.
| |
Collapse
|
16
|
Oeste CL, Pinar M, Schink KO, Martínez-Turrión J, Stenmark H, Peñalva MA, Pérez-Sala D. An isoprenylation and palmitoylation motif promotes intraluminal vesicle delivery of proteins in cells from distant species. PLoS One 2014; 9:e107190. [PMID: 25207810 PMCID: PMC4160200 DOI: 10.1371/journal.pone.0107190] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 08/07/2014] [Indexed: 12/22/2022] Open
Abstract
The C-terminal ends of small GTPases contain hypervariable sequences which may be posttranslationally modified by defined lipid moieties. The diverse structural motifs generated direct proteins towards specific cellular membranes or organelles. However, knowledge on the factors that determine these selective associations is limited. Here we show, using advanced microscopy, that the isoprenylation and palmitoylation motif of human RhoB (–CINCCKVL) targets chimeric proteins to intraluminal vesicles of endolysosomes in human cells, displaying preferential co-localization with components of the late endocytic pathway. Moreover, this distribution is conserved in distant species, including cells from amphibians, insects and fungi. Blocking lipidic modifications results in accumulation of CINCCKVL chimeras in the cytosol, from where they can reach endolysosomes upon release of this block. Remarkably, CINCCKVL constructs are sorted to intraluminal vesicles in a cholesterol-dependent process. In the lower species, neither the C-terminal sequence of RhoB, nor the endosomal distribution of its homologs are conserved; in spite of this, CINCCKVL constructs also reach endolysosomes in Xenopus laevis and insect cells. Strikingly, this behavior is prominent in the filamentous ascomycete fungus Aspergillus nidulans, in which GFP-CINCCKVL is sorted into endosomes and vacuoles in a lipidation-dependent manner and allows monitoring endosomal movement in live fungi. In summary, the isoprenylated and palmitoylated CINCCKVL sequence constitutes a specific structure which delineates an endolysosomal sorting strategy operative in phylogenetically diverse organisms.
Collapse
Affiliation(s)
- Clara L. Oeste
- Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Mario Pinar
- Department of Cellular and Molecular Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Kay O. Schink
- Centre for Cancer Biomedicine, Faculty of Medicine, Oslo University Hospital, Oslo, Norway
| | - Javier Martínez-Turrión
- Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Harald Stenmark
- Centre for Cancer Biomedicine, Faculty of Medicine, Oslo University Hospital, Oslo, Norway
| | - Miguel A. Peñalva
- Department of Cellular and Molecular Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - Dolores Pérez-Sala
- Department of Chemical and Physical Biology, Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, Madrid, Spain
- * E-mail:
| |
Collapse
|
17
|
Di Maro G, Orlandella FM, Bencivenga TC, Salerno P, Ugolini C, Basolo F, Maestro R, Salvatore G. Identification of targets of Twist1 transcription factor in thyroid cancer cells. J Clin Endocrinol Metab 2014; 99:E1617-26. [PMID: 24848707 DOI: 10.1210/jc.2013-3799] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Anaplastic thyroid carcinoma (ATC) is one of the most aggressive human tumors. Twist1 is a basic helix-loop-helix transcription factor involved in cancer development and progression. We showed that Twist1 affects thyroid cancer cell survival and motility. OBJECTIVE We aimed to identify Twist1 targets in thyroid cancer cells. DESIGN Transcriptional targets of Twist1 were identified by gene expression profiling the TPC-Twist1 cells in comparison with control cells. Functional studies were performed by silencing in TPC-Twist1 and in CAL62 cells the top 10 upregulated genes and by evaluating cell proliferation, survival, migration, and invasion. Chromatin immunoprecipitation was performed to verify direct binding of Twist1 to target genes. Quantitative RT-PCR was applied to study the expression level of Twist1 target genes in human thyroid carcinoma samples. RESULTS According to the gene expression profile, the top functions enriched in TPC-Twist1 cells were cellular movement, cellular growth and proliferation, and cell death and survival. Silencing of the top 10 upregulated genes reduced viability of TPC-Twist1 and of CAL62 cells. Silencing of COL1A1, KRT7, and PDZK1 also induced cell death. Silencing of HS6ST2, THRB, ID4, RHOB, and PDZK1IP also impaired migration and invasion of TPC-Twist1 and of CAL62 cells. Chromatin immunoprecipitation showed that Twist1 directly binds the promoter of the top 10 upregulated genes. Quantitative RT-PCR showed that HS6ST2, COL1A1, F2RL1, LEPREL1, PDZK1, and PDZK1IP1 are overexpressed in thyroid carcinoma samples compared with normal thyroids. CONCLUSIONS We identified a set of genes that mediates Twist1 biological effects in thyroid cancer cells.
Collapse
Affiliation(s)
- Gennaro Di Maro
- Dipartimento di Medicina Molecolare e Biotecnologie Mediche (G.D.M., F.M.O., T.C.B., P.S.), Università di Napoli "Federico II," Italy 80131; Dipartimento di Area Medica (C.U.), Azienda Ospedaliero-Universitaria Pisana, Pisa, Italy 56126; Dipartimento di Patologia Chirugica, Medica (F.B.), Molecolare e dell'Area Critica dell' Università di Pisa, Italy 56124; Experimental Oncology 1 (R.M.), Centro di Riferimento Oncologico, Aviano, Italy 33081; and Dipartimento di Scienze Motorie e del Benessere (G.S.), Universita' "Parthenope," 80133 Napoli, Italy 80133
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Majhen D, Stojanović N, Vukić D, Pichon C, Leduc C, Osmak M, Ambriović-Ristov A. Increased adenovirus Type 5 mediated transgene expression due to RhoB down-regulation. PLoS One 2014; 9:e86698. [PMID: 24466204 PMCID: PMC3899303 DOI: 10.1371/journal.pone.0086698] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Accepted: 12/13/2013] [Indexed: 01/01/2023] Open
Abstract
Adenovirus type 5 (Ad5) is a non-enveloped DNA virus frequently used as a gene transfer vector. Efficient Ad5 cell entry depends on the availability of its primary receptor, coxsackie and adenovirus receptor, which is responsible for attachment, and integrins, secondary receptors responsible for adenovirus internalization via clathrin-mediated endocytosis. However, efficacious adenovirus-mediated transgene expression also depends on successful trafficking of Ad5 particles to the nucleus of the target cell. It has been shown that changes occurring in tumor cells during development of resistance to anticancer drugs can be beneficial for adenovirus mediated transgene expression. In this study, using an in vitro model consisting of a parental cell line, human laryngeal carcinoma HEp2 cells, and a cisplatin-resistant clone CK2, we investigated the cause of increased Ad5-mediated transgene expression in CK2 as compared to HEp2 cells. We show that the primary cause of increased Ad5-mediated transgene expression in CK2 cells is not modulation of receptors on the cell surface or change in Ad5wt attachment and/or internalization, but is rather the consequence of decreased RhoB expression. We propose that RhoB plays an important role in Ad5 post-internalization events and more particularly in Ad5 intracellular trafficking. To the best of our knowledge, this is the first study showing changed Ad5 trafficking pattern between cells expressing different amount of RhoB, indicating the role of RhoB in Ad5 intracellular trafficking.
Collapse
Affiliation(s)
- Dragomira Majhen
- Division of Molecular Biology, Ruđer Bošković Institute, Zagreb, Croatia
- * E-mail: (DM); (AA)
| | | | - Dunja Vukić
- Division of Molecular Biology, Ruđer Bošković Institute, Zagreb, Croatia
| | - Chantal Pichon
- Centre de Biophysique Moléculaire CNRS-UPR4301 Affiliated to the Université d'Orléans, Orléans, France
| | - Chloé Leduc
- Centre de Biophysique Moléculaire CNRS-UPR4301 Affiliated to the Université d'Orléans, Orléans, France
| | - Maja Osmak
- Division of Molecular Biology, Ruđer Bošković Institute, Zagreb, Croatia
| | | |
Collapse
|
19
|
Liu Y, Song N, Ren K, Meng S, Xie Y, Long Q, Chen X, Zhao X. Expression loss and revivification of RhoB gene in ovary carcinoma carcinogenesis and development. PLoS One 2013; 8:e78417. [PMID: 24223801 PMCID: PMC3815309 DOI: 10.1371/journal.pone.0078417] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 09/20/2013] [Indexed: 12/23/2022] Open
Abstract
RhoB, a member of small GTPases belonging to the Ras protein superfamily, might have a suppressive activity in cancer progression. Here, expression of RhoB gene was evaluated in human benign, borderline and malignant ovary tumors by immunostaining, with normal ovary tissue as control. Malignant tumors were assessed according to Federation Internationale de Gynecologie Obstetrique (FIGO) guidelines and classified in stage I-IV. Revivification of RhoB gene was investigated by analyzing the effect of histone deacetylase (HDAC) inhibitor trichostatin (TSA) and methyltransferase inhibitor 5-azacytidine (5-Aza) on ovarian cancer cells via RT-PCR and western blot. Apoptosis of ovary cancer cells was detected using flowcytometry and fluorescence microscopy. Subsequently, RhoB expression is detected in normal ovary epithelium, borderline tumors, and decreases significantly or lost in the majority of ovarian cancer specimen (P<0.05). RhoB expression decreases significantly from stage II (71.4%) to stage III (43.5%) to stage IV (18.2%, P<0.05). TSA can both significantly revive the RhoB gene and mediate apoptosis of ovarian cancer cells, but 5-Aza couldn't. Interference into Revivification of RhoB gene results in reduction of ovary carcinoma cell apoptosis. It is proposed that loss of RhoB expression occurs frequently in ovary carcinogenesis and progression and its expression could be regulated by histone deacetylation but not by promoter hypermethylation, which may serve as a prospective gene treatment target for the patients with ovarian malignancy not responding to standard therapies.
Collapse
Affiliation(s)
- Yingwei Liu
- Department of Gynecology & Obstetrics, West China Second Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Na Song
- National Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Kexing Ren
- National Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Shenglan Meng
- National Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Yao Xie
- Department of Gynecology & Obstetrics, West China Second Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Qida Long
- Department of Gynecology & Obstetrics, West China Second Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
| | - Xiancheng Chen
- National Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
- * E-mail: (XZ); chenwcrs @126.com (XC)
| | - Xia Zhao
- Department of Gynecology & Obstetrics, West China Second Hospital, Sichuan University, Chengdu, Sichuan, People’s Republic of China
- * E-mail: (XZ); chenwcrs @126.com (XC)
| |
Collapse
|
20
|
Chan KC, Lin MC, Huang CN, Chang WC, Wang CJ. Mulberry 1-deoxynojirimycin pleiotropically inhibits glucose-stimulated vascular smooth muscle cell migration by activation of AMPK/RhoB and down-regulation of FAK. J Agric Food Chem 2013; 61:9867-9875. [PMID: 24050301 DOI: 10.1021/jf403636z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Mulberry 1-deoxynojirimycin (DNJ), an inhibitor of α-glucosidase, has been reported to help prevent diabetes mellitus and suppress lipid accumulation. The aim of this study was to determine whether mulberry DNJ has pleiotropic effects on the development of atherosclerosis. The mechanisms by which mulberry DNJ might inhibit migration of A7r5 vascular smooth muscle cells (VSMCs) under hyperglycemic conditions mimicking diabetes were investigated. The antimigratory effects of DNJ on VSMCs were assessed by Western blot analysis of migration-related proteins and by electric cell-substrate impedance sensing (ECIS) and visualization of F-actin cytoskeleton. Two pathways of DNJ-mediated inhibition of VSMC migration were identified. The first involved AMPK activation to inhibit fatty acid synthase (FASN) and Akt activity and then RhoB activation to inhibit nuclear factor-κB (NF-κB) and matrix metalloproteinase-2 (MMP) activity. The second involved inhibition of focal adhesion kinase (FAK), Ras, and RhoA activity leading to inhibition of F-actin activity.
Collapse
Affiliation(s)
- Kuei-Chuan Chan
- Department of Internal Medicine, Chung-Shan Medical University Hospital , No. 110, Sec. 1, Jianguo N. Road, Taichung 402, Taiwan
| | | | | | | | | |
Collapse
|
21
|
Jin C, Zhao Y, Yu L, Xu S, Fu G. MicroRNA-21 mediates the rapamycin-induced suppression of endothelial proliferation and migration. FEBS Lett 2013; 587:378-85. [PMID: 23313253 DOI: 10.1016/j.febslet.2012.12.021] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 12/14/2012] [Accepted: 12/17/2012] [Indexed: 11/19/2022]
Abstract
Rapamycin suppresses endothelial proliferation and migration, which leads to delayed re-endothelialization in the rapamycin-eluted stents that are used in coronary heart disease patients. Because microRNAs (miRs) play important roles in endothelial angiogenesis, we tested the hypothesis that rapamycin induces endothelial suppression, partly through pathways that involve miRs. Rapamycin treatment increased the expression of miR-21 in HUVECs. The downregulation of miR-21 by inhibitors abolished the negative effects of rapamycin on endothelial cell growth and mobility. RhoB was confirmed as a direct target gene of miR-21. Knockdown of Raptor by siRNA mimicked the effects of rapamycin on miR-21 expression. Our study provides a new explanation of the mechanism of rapamycin-mediated inhibition of endothelial proliferation and migration.
Collapse
Affiliation(s)
- Chongying Jin
- Department of Cardiology, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, 3 East Qingchun Road, Hangzhou 310016, Zhejiang Province, PR China
| | | | | | | | | |
Collapse
|
22
|
Tsai HC, Boucher DL, Martinez A, Tepper CG, Kung HJ. Modeling truncated AR expression in a natural androgen responsive environment and identification of RHOB as a direct transcriptional target. PLoS One 2012; 7:e49887. [PMID: 23209612 PMCID: PMC3510170 DOI: 10.1371/journal.pone.0049887] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 10/16/2012] [Indexed: 12/13/2022] Open
Abstract
Recent studies identifying putative truncated androgen receptor isoforms with ligand-independent activity have shed new light on the acquisition of androgen depletion independent (ADI) growth of prostate cancer. In this study, we present a model system in which a C-terminally truncated variant of androgen receptor (TC-AR) is inducibly expressed in LNCaP, an androgen-dependent cell line, which expresses little truncated receptor. We observed that when TC-AR is overexpressed, the endogenous full length receptor (FL-AR) is transcriptionally downmodulated. This in essence allows us to “replace” FL-AR with TC-AR and compare their individual properties in exactly the same genetic and cellular background, which has not been performed before. We show that the TC-AR translocates to the nucleus, activates transcription of AR target genes in the absence of DHT and is sufficient to confer ADI growth to the normally androgen dependent LNCaP line. We also show that while there is significant overlap in the genes regulated by FL- and TC-AR there are also differences in the respective suites of target genes with each AR form regulating genes that the other does not. Among the genes uniquely activated by TC-AR is RHOB which is shown to be involved in the increased migration and morphological changes observed in LN/TC-AR, suggesting a role of RHOB in the regulation of androgen-independent behavior of prostate cancer cells.
Collapse
Affiliation(s)
- Hui-Chi Tsai
- Department of Biochemistry & Molecular Medicine, School of Medicine and Cancer Center, University of California Davis, Davis, California, United States of America
| | - David L. Boucher
- Department of Biomedical Engineering, University of California Davis, Davis, California, United States of America
| | - Anthony Martinez
- Department of Biochemistry & Molecular Medicine, School of Medicine and Cancer Center, University of California Davis, Davis, California, United States of America
| | - Clifford G. Tepper
- Department of Biochemistry & Molecular Medicine, School of Medicine and Cancer Center, University of California Davis, Davis, California, United States of America
| | - Hsing-Jien Kung
- Department of Biochemistry & Molecular Medicine, School of Medicine and Cancer Center, University of California Davis, Davis, California, United States of America
- * E-mail:
| |
Collapse
|
23
|
Rangrez AY, M'Baya-Moutoula E, Metzinger-Le Meuth V, Hénaut L, Djelouat MSEI, Benchitrit J, Massy ZA, Metzinger L. Inorganic phosphate accelerates the migration of vascular smooth muscle cells: evidence for the involvement of miR-223. PLoS One 2012; 7:e47807. [PMID: 23094093 PMCID: PMC3475714 DOI: 10.1371/journal.pone.0047807] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Accepted: 09/17/2012] [Indexed: 12/21/2022] Open
Abstract
Backgound An elevated serum inorganic phosphate (Pi) level is a major risk factor for kidney disease and downstream vascular complications. We focused on the effect of Pi levels on human aortic vascular smooth muscle cells (VSMCs), with an emphasis on the role of microRNAs (miRNAs). Methodology/Principal Findings Exposure of human primary VSMCs in vitro to pathological levels of Pi increased calcification, migration rate and concomitantly reduced cell proliferation and the amount of the actin cytoskeleton. These changes were evidenced by significant downregulation of miRNA-143 (miR-143) and miR-145 and concomitant upregulation of their targets and key markers in synthetic VSMCs, such as Krüppel-like factors−4 and −5 and versican. Interestingly, we also found that miR-223 (a marker of muscle damage and a key factor in osteoclast differentiation) is expressed in VSMCs and is significantly upregulated in Pi-treated cells. Over-expressing miR-223 in VSMCs increased proliferation and markedly enhanced VSMC migration. Additionally, we found that the expression of two of the known miR-223 targets, Mef2c and RhoB, was highly reduced in Pi treated as well as miR-223 over-expressing VSMCs. To complement these in vitro findings, we also observed significant downregulation of miR-143 and miR-145 and upregulation of miR-223 in aorta samples collected from ApoE knock-out mice, which display vascular calcification. Conclusions/Significance Our results suggest that (i) high levels of Pi increase VSMC migration and calcification, (ii) altered expression levels of miR-223 could play a part in this process and (iii) miR-223 is a potential new biomarker of VSMC damage.
Collapse
MESH Headings
- Actin Cytoskeleton/genetics
- Actin Cytoskeleton/metabolism
- Animals
- Aorta/cytology
- Aorta/drug effects
- Aorta/metabolism
- Apolipoproteins E/deficiency
- Apolipoproteins E/genetics
- Cell Movement/drug effects
- Cell Proliferation
- Down-Regulation/drug effects
- Gene Expression/drug effects
- Humans
- Kruppel-Like Transcription Factors/genetics
- Kruppel-Like Transcription Factors/metabolism
- MADS Domain Proteins/genetics
- MADS Domain Proteins/metabolism
- MEF2 Transcription Factors
- Mice
- Mice, Knockout
- MicroRNAs/genetics
- MicroRNAs/metabolism
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/drug effects
- Muscle, Smooth, Vascular/metabolism
- Myocytes, Smooth Muscle/cytology
- Myocytes, Smooth Muscle/drug effects
- Myocytes, Smooth Muscle/metabolism
- Myogenic Regulatory Factors/genetics
- Myogenic Regulatory Factors/metabolism
- Phosphates/metabolism
- Phosphates/pharmacology
- Primary Cell Culture
- Up-Regulation/drug effects
- Vascular Calcification/genetics
- Vascular Calcification/metabolism
- Versicans/genetics
- Versicans/metabolism
- rhoB GTP-Binding Protein/genetics
- rhoB GTP-Binding Protein/metabolism
Collapse
Affiliation(s)
- Ashraf Yusuf Rangrez
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
| | - Eléonore M'Baya-Moutoula
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
| | | | - Lucie Hénaut
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
| | | | - Joyce Benchitrit
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
| | - Ziad A. Massy
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
- Division(s) of Pharmacology / Nephrology, Amiens University Hospital, Amiens, France
| | - Laurent Metzinger
- INSERM U1088, Amiens, France
- Faculty of Pharmacy and Medicine, Jules Verne University of Picardie, Amiens, France
- * E-mail:
| |
Collapse
|
24
|
Huelsenbeck J, May M, Schulz F, Schelle I, Ronkina N, Hohenegger M, Fritz G, Just I, Gerhard R, Genth H. Cytoprotective effect of the small GTPase RhoB expressed upon treatment of fibroblasts with the Ras-glucosylating Clostridium sordellii lethal toxin. FEBS Lett 2012; 586:3665-73. [PMID: 22982107 DOI: 10.1016/j.febslet.2012.08.024] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2011] [Revised: 08/24/2012] [Accepted: 08/24/2012] [Indexed: 01/02/2023]
Abstract
Mono-glucosylation of (H/K/N)Ras by Clostridium sordellii lethal toxin (TcsL) blocks critical survival signaling pathways, resulting in apoptosis. In this study, TcsL and K-Ras knock-down by siRNA are presented to result in expression of the cell death-regulating small GTPase RhoB. TcsL-induced RhoB expression is based on transcriptional activation involving p38(alpha) MAP kinase. Newly synthesized RhoB protein is rapidly degraded in a proteasome- and a caspase-dependent manner, providing first evidence for caspase-dependent degradation of a Rho family protein. Although often characterised as a pro-apoptotic protein, RhoB suppresses caspase-3 activation in TcsL-treated fibroblasts. The finding on the cytoprotective activity of RhoB in TcsL-treated cells re-enforces the concept that RhoB exhibits cytoprotective rather than pro-apoptotic activity in a cellular background of inactive Ras.
Collapse
|
25
|
Allanore Y, Saad M, Dieudé P, Avouac J, Distler JHW, Amouyel P, Matucci-Cerinic M, Riemekasten G, Airo P, Melchers I, Hachulla E, Cusi D, Wichmann HE, Wipff J, Lambert JC, Hunzelmann N, Tiev K, Caramaschi P, Diot E, Kowal-Bielecka O, Valentini G, Mouthon L, Czirják L, Damjanov N, Salvi E, Conti C, Müller M, Müller-Ladner U, Riccieri V, Ruiz B, Cracowski JL, Letenneur L, Dupuy AM, Meyer O, Kahan A, Munnich A, Boileau C, Martinez M. Genome-wide scan identifies TNIP1, PSORS1C1, and RHOB as novel risk loci for systemic sclerosis. PLoS Genet 2011; 7:e1002091. [PMID: 21750679 PMCID: PMC3131285 DOI: 10.1371/journal.pgen.1002091] [Citation(s) in RCA: 175] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2010] [Accepted: 04/05/2011] [Indexed: 12/18/2022] Open
Abstract
Systemic sclerosis (SSc) is an orphan, complex, inflammatory disease affecting the immune system and connective tissue. SSc stands out as a severely incapacitating and life-threatening inflammatory rheumatic disease, with a largely unknown pathogenesis. We have designed a two-stage genome-wide association study of SSc using case-control samples from France, Italy, Germany, and Northern Europe. The initial genome-wide scan was conducted in a French post quality-control sample of 564 cases and 1,776 controls, using almost 500 K SNPs. Two SNPs from the MHC region, together with the 6 loci outside MHC having at least one SNP with a P<10(-5) were selected for follow-up analysis. These markers were genotyped in a post-QC replication sample of 1,682 SSc cases and 3,926 controls. The three top SNPs are in strong linkage disequilibrium and located on 6p21, in the HLA-DQB1 gene: rs9275224, P = 9.18×10(-8), OR = 0.69, 95% CI [0.60-0.79]; rs6457617, P = 1.14×10(-7) and rs9275245, P = 1.39×10(-7). Within the MHC region, the next most associated SNP (rs3130573, P = 1.86×10(-5), OR = 1.36 [1.18-1.56]) is located in the PSORS1C1 gene. Outside the MHC region, our GWAS analysis revealed 7 top SNPs (P<10(-5)) that spanned 6 independent genomic regions. Follow-up of the 17 top SNPs in an independent sample of 1,682 SSc and 3,926 controls showed associations at PSORS1C1 (overall P = 5.70×10(-10), OR:1.25), TNIP1 (P = 4.68×10(-9), OR:1.31), and RHOB loci (P = 3.17×10(-6), OR:1.21). Because of its biological relevance, and previous reports of genetic association at this locus with connective tissue disorders, we investigated TNIP1 expression. A markedly reduced expression of the TNIP1 gene and also its protein product were observed both in lesional skin tissue and in cultured dermal fibroblasts from SSc patients. Furthermore, TNIP1 showed in vitro inhibitory effects on inflammatory cytokine-induced collagen production. The genetic signal of association with TNIP1 variants, together with tissular and cellular investigations, suggests that this pathway has a critical role in regulating autoimmunity and SSc pathogenesis.
Collapse
Affiliation(s)
- Yannick Allanore
- Université Paris Descartes, Rhumatologie A, INSERM, U1016, Hôpital Cochin, APHP, Paris, France.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Volanis D, Zaravinos A, Kadiyska T, Delakas D, Zoumpourlis V, Spandidos DA. Expression profile of Rho kinases in urinary bladder cancer. J BUON 2011; 16:511-521. [PMID: 22006759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
PURPOSE To investigate the expression of RhoA, RhoB, RhoC, Rac1 and Cdc42 kinases in urothelial cell carcinoma (UCC) of the urinary bladder and determine the expression profile of 107 Rho-associated genes, including GTPases, GDIs, GAPs and GEFs. METHODS Rho expression was investigated using microarrays, qPCR and Western blotting in 77 UCC specimens with paired normal urothelium. Computational analysis was also performed on Gene Expression Omnibus datasets. Further microarray analysis was carried out for the expression profiling of the Rho-associated genes. RESULTS RhoB mRNA and protein levels were significantly lower in UCC, suggesting a tumour-suppressor role. On the contrary, mRNA of RhoC and protein levels of RhoA, RhoC and Cdc42, respectively, were significantly higher in UCC vs. normal tissue. High Cdc42 mRNA levels correlated with worse overall survival (p=0.027), whereas high RhoB mRNA levels correlated both with better overall (p=0.0258) and cancer-specific (p=0.0272) survival. Computational analysis verified the expression profile of Rho kinases among superficial UCCs, muscle-invasive UCCs and normal tissues. CONCLUSION The majority of the Rho-related genes showed over-expression in UCC vs. normal tissue. Alterations in RhoA, RhoB, RhoC, Rac1 and Cdc42 expression play a significant role in the genesis and progression of UCC of the urinary bladder.
Collapse
Affiliation(s)
- D Volanis
- Department of Clinical Virology, University of Crete, Heraklion, Crete, Greece
| | | | | | | | | | | |
Collapse
|
27
|
Hu XH, Wu WF, Qing Y, Song LF, Huang W, Wu Y, Li Y, Wu XH. [Improved therapeutic effectiveness by combining recombinant human RhoB with low-dose cisplatin in human lung cancer in nude mice]. Sichuan Da Xue Xue Bao Yi Xue Ban 2011; 42:475-479. [PMID: 21866629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVE To determine the antitumor effects of the recombinant human RhoB with low-dose cisplatin in lung carcinoma models. METHODS The pVITRO2-RhoB recombinant was constructed and transfected into A549 cells. Its expression and the inhibition effect to the A549 cells were observed models. A549 lung carcinoma mice were treated with either RhoB or cisplatin or both agents together. And the change of tumor size, the survive time of mice, the apoptosis of tumor were also observed. RESULTS The pVITRO2-RhoB recombinant was constructed successfully. This recombinant could inhibit the growth and promote the apoptosis of A594 in vitro. Mice treated with RhoB or low-dose cisplatin treatment individually resulted in tumor inhibition to a certain extent. Mice treated with combination of RhoB and low-dose cisplatin resulted in synergistic antitumor activity with more effective tumor inhibition (P < 0.05) and longer survival (P < 0.05). TUNEL analysis of tumors exhibited that RhoB in combination with cisplatin led to the increased rate of apoptosis (P < 0.05). CONCLUSION Our data demonstrated that RhoB could increase the sensitivity of lung carcinoma to cisplatin, resulting in enhanced anti-tumor activity. These results suggest that combination with recombinant human RhoB with chemotherapy drugs may be an effective approach in the treatment of lung carcinoma.
Collapse
Affiliation(s)
- Xiao-Hong Hu
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | | | | | | | | | | | | | | |
Collapse
|
28
|
Srougi MC, Burridge K. The nuclear guanine nucleotide exchange factors Ect2 and Net1 regulate RhoB-mediated cell death after DNA damage. PLoS One 2011; 6:e17108. [PMID: 21373644 PMCID: PMC3044157 DOI: 10.1371/journal.pone.0017108] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Accepted: 01/20/2011] [Indexed: 12/19/2022] Open
Abstract
Commonly used antitumor treatments, including radiation and chemotherapy, function by damaging the DNA of rapidly proliferating cells. However, resistance to these agents is a predominant clinical problem. A member of the Rho family of small GTPases, RhoB has been shown to be integral in mediating cell death after ionizing radiation (IR) or other DNA damaging agents in Ras-transformed cell lines. In addition, RhoB protein expression increases after genotoxic stress, and loss of RhoB expression causes radio- and chemotherapeutic resistance. However, the signaling pathways that govern RhoB-induced cell death after DNA damage remain enigmatic. Here, we show that RhoB activity increases in human breast and cervical cancer cell lines after treatment with DNA damaging agents. Furthermore, RhoB activity is necessary for DNA damage-induced cell death, as the stable loss of RhoB protein expression using shRNA partially protects cells and prevents the phosphorylation of c-Jun N-terminal kinases (JNKs) and the induction of the pro-apoptotic protein Bim after IR. The increase in RhoB activity after genotoxic stress is associated with increased activity of the nuclear guanine nucleotide exchange factors (GEFs), Ect2 and Net1, but not the cytoplasmic GEFs p115 RhoGEF or Vav2. Importantly, loss of Ect2 and Net1 via siRNA-mediated protein knock-down inhibited IR-induced increases in RhoB activity, reduced apoptotic signaling events, and protected cells from IR-induced cell death. Collectively, these data suggest a mechanism involving the nuclear GEFs Ect2 and Net1 for activating RhoB after genotoxic stress, thereby facilitating cell death after treatment with DNA damaging agents.
Collapse
Affiliation(s)
- Melissa C Srougi
- Department of Cell and Developmental Biology, University of North Carolina, Chapel Hill, North Carolina, United States of America.
| | | |
Collapse
|
29
|
Sabatel C, Malvaux L, Bovy N, Deroanne C, Lambert V, Gonzalez MLA, Colige A, Rakic JM, Noël A, Martial JA, Struman I. MicroRNA-21 exhibits antiangiogenic function by targeting RhoB expression in endothelial cells. PLoS One 2011; 6:e16979. [PMID: 21347332 PMCID: PMC3037403 DOI: 10.1371/journal.pone.0016979] [Citation(s) in RCA: 185] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Accepted: 01/19/2011] [Indexed: 01/04/2023] Open
Abstract
Background MicroRNAs (miRNAs) are endogenously expressed small non-coding RNAs that regulate gene expression at post-transcriptional level. The recent discovery of the involvement of these RNAs in the control of angiogenesis renders them very attractive in the development of new approaches for restoring the angiogenic balance. Whereas miRNA-21 has been demonstrated to be highly expressed in endothelial cells, the potential function of this miRNA in angiogenesis has never been investigated. Methodology/Principal Findings We first observed in endothelial cells a negative regulation of miR-21 expression by serum and bFGF, two pro-angiogenic factors. Then using in vitro angiogenic assays, we observed that miR-21 acts as a negative modulator of angiogenesis. miR-21 overexpression reduced endothelial cell proliferation, migration and the ability of these cells to form tubes whereas miR-21 inhibition using a LNA-anti-miR led to opposite effects. Expression of miR-21 in endothelial cells also led to a reduction in the organization of actin into stress fibers, which may explain the decrease in cell migration. Further mechanistic studies showed that miR-21 targets RhoB, as revealed by a decrease in RhoB expression and activity in miR-21 overexpressing cells. RhoB silencing impairs endothelial cell migration and tubulogenesis, thus providing a possible mechanism for miR-21 to inhibit angiogenesis. Finally, the therapeutic potential of miR-21 as an angiogenesis inhibitor was demonstrated in vivo in a mouse model of choroidal neovascularization. Conclusions/Significance Our results identify miR-21 as a new angiogenesis inhibitor and suggest that inhibition of cell migration and tubulogenesis is mediated through repression of RhoB.
Collapse
Affiliation(s)
- Céline Sabatel
- Unit of Molecular Biology and Genetic Engineering, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Ludovic Malvaux
- Unit of Molecular Biology and Genetic Engineering, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Nicolas Bovy
- Unit of Molecular Biology and Genetic Engineering, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Christophe Deroanne
- Laboratory of Connective Tissues, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Vincent Lambert
- Laboratory of Tumor and Development Biology, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
- Department of Ophthalmology, University Hospital, Sart Tilman, Liège, Belgium
| | - Maria-Luz Alvarez Gonzalez
- Laboratory of Tumor and Development Biology, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Alain Colige
- Laboratory of Connective Tissues, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Jean-Marie Rakic
- Department of Ophthalmology, University Hospital, Sart Tilman, Liège, Belgium
| | - Agnès Noël
- Laboratory of Tumor and Development Biology, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Joseph A. Martial
- Unit of Molecular Biology and Genetic Engineering, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
| | - Ingrid Struman
- Unit of Molecular Biology and Genetic Engineering, GIGA-Research, University of Liège, Sart Tilman, Liège, Belgium
- * E-mail:
| |
Collapse
|
30
|
Kim YM, Shin YK, Jun HJ, Rha SY, Pyo H. Systematic analyses of genes associated with radiosensitizing effect by celecoxib, a specific cyclooxygenase-2 inhibitor. J Radiat Res 2011; 52:752-765. [PMID: 22104269 DOI: 10.1269/jrr.10146] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
To investigate genes regulated by COX-2 or a COX-2 specific inhibitor, celecoxib, in irradiated cancer cells, we analyzed changes in gene expression using complementary DNA microarray following celecoxib or combined celecoxib and ionizing radiation (IR) treatment in a stable COX-2 knockdown A549 (AS) and a mock cell line (AN). Thirty-six genes were differentially expressed by COX-2 knockdown. Celecoxib changed the expressions of 40 and 69 genes in AN and AS cells, respectively. Twenty-seven genes were synchronously regulated by COX-2 and celecoxib. Among these, celecoxib regulated ras homolog gene family B and mitosin protein expression in a COX-2 dependent manner, especially in irradiated cells. In addition, we identified 11 genes that changed by more than 1.5 times the expected additive values after celecoxib and IR treatment. The current study may provide evidence that COX-2 or celecoxib regulates various intracellular functions in addition to their enzymatic activity regulation. We also identified candidate molecules that may be responsible for COX-2-dependent radiosensitization by celecoxib.
Collapse
Affiliation(s)
- Young-Mee Kim
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Gangnam-gu, Seoul, Korea
| | | | | | | | | |
Collapse
|
31
|
Marlow LA, D'Innocenzi J, Zhang Y, Rohl SD, Cooper SJ, Sebo T, Grant C, McIver B, Kasperbauer JL, Wadsworth JT, Casler JD, Kennedy PW, Highsmith WE, Clark O, Milosevic D, Netzel B, Cradic K, Arora S, Beaudry C, Grebe SK, Silverberg ML, Azorsa DO, Smallridge RC, Copland JA. Detailed molecular fingerprinting of four new anaplastic thyroid carcinoma cell lines and their use for verification of RhoB as a molecular therapeutic target. J Clin Endocrinol Metab 2010; 95:5338-47. [PMID: 20810568 PMCID: PMC2999968 DOI: 10.1210/jc.2010-1421] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Anaplastic thyroid carcinoma (ATC) is a highly aggressive carcinoma in need of therapeutic options. One critical component of drug discovery is the availability of well-characterized cell lines for identification of molecular mechanisms related to tumor biology and drug responsiveness. Up to 42% of human thyroid cancer cell lines are redundant or not of correct tissue origin, and a comprehensive analysis is currently nonexistent. Mechanistically, RhoB has been identified as a novel molecular target for ATC therapy. OBJECTIVE The aim was to develop four ATC cell lines detailing genetic, molecular, and phenotypic characteristics and to test five classes of drugs on the cell lines to determine whether they inhibited cell proliferation in a RhoB-dependent fashion. DESIGN Four cell lines were derived from ATC tumors. Short tandem DNA repeat and mutational status of the originating tumors and cell lines were performed along with molecular and phenotypic characterizations. Compounds were tested for growth inhibition and ability to up-regulate RhoB. RESULTS Cell line authenticity was confirmed by DNA short tandem repeat analysis. Each proved unique regarding expression of thyroid markers, oncogene status, amplified and deleted genes, and proliferative growth rates. FTI-277, GGTI-286, lovastatin, romidepsin, and UCN-01 up-regulated RhoB and inhibited cell proliferation in a dose-responsive fashion with only romidepsin and FTI-277 being RhoB dependent. CONCLUSIONS Molecular descriptions of thyroid lines were matched to the originating tumors, setting a new standard for cell line characterization. Furthermore, suppressed RhoB is implicated as a molecular target for therapy against ATC because five classes of drugs up-regulate RhoB and inhibit growth dose-responsively.
Collapse
Affiliation(s)
- Laura A Marlow
- Mayo Clinic, Department of Cancer Biology, 4500 San Pablo Road, Jacksonville, Florida 32224, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Yoneda M, Hirokawa YS, Ohashi A, Uchida K, Kami D, Watanabe M, Yokoi T, Shiraishi T, Wakusawa S. RhoB enhances migration and MMP1 expression of prostate cancer DU145. Exp Mol Pathol 2009; 88:90-5. [PMID: 19782069 DOI: 10.1016/j.yexmp.2009.09.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2009] [Revised: 09/15/2009] [Accepted: 09/15/2009] [Indexed: 01/28/2023]
Abstract
Rho family protein regulates variety of cellular functions as cytoskeletal organization, cell proliferation and apoptosis. In the present study, we demonstrate that RhoB-overexpressed prostate cancer cells showed an enhanced cell motility and the administration of the GSK-3 inhibitors inhibited this increase in migration. Among the extracellular matrix and adhesion-related molecules, MMP1 RNA expression was increased in RhoB-overexpressed cells, administration of MMP inhibitor suppressed the collagen gel invasion in these cells. This is the first report evaluating RhoB function and the downstream signaling events in prostate cancer cell. Our results indicate that RhoB promotes cell motility and invasion in a metastatic prostate cancer cell.
Collapse
Affiliation(s)
- Misao Yoneda
- Department of Medical Technology, Nagoya University School of Health Sciences, 1-1-20 Minami, Daiko, Higashi-ku, Nagoya City, Aichi, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
33
|
Abstract
Although glucocorticoid (GC) has been reported to inhibit macrophage killing activity and cytokine production in response to proinflammatory stimuli, the effect of GC on macrophage proliferation is controversial. In our previous study, we found that inhibition of glucocorticoid receptor (GR) expression in murine macrophage cell line RAW264.7 cells (RAW-GR(-) cells) by RNAi significantly promoted cell proliferation. In the present study, we provide the evidence that the expression of Rhob, a member of Rho GTPases with anti-cancer character, remarkably decreased in RAW-GR(-) and RAW264.7 cells transiently transfected with GR-RNAi vector. Overexpression or constitutive activation of Rhob in RAW-GR(-) and RAW264.7 cells by transfection with wild-type Rhob expression vector (Rhob-wt) or constitutively activated Rhob plasmid (Rhob-V14) resulted in decreased proliferation of the two cell lines. Oppositely, the proliferation of RAW264.7 cells was significantly increased when the expression of Rhob by RNA interference technique or the activity of Rhob by transfection with dominant negative Rhob mutant that is defective in nucleotide binding (Rhob-N19) was inhibited. In addition, enhanced activity of Akt, but not MAPK3/1 or MAPK14, was found in RAW-GR(-) cells. Blocking the pathway of phosphatidylinositol 3-kinase (PI3K)/Akt with the specific inhibitor LY294002 decreased the proliferation and elevated RHOB protein level, indicating that PI3K/Akt signal plays its role of proliferation modulation upstream of RHOB protein. In conclusion, these results demonstrate that Rhob plays an important role in the antiproliferative effect of GR on RAW264.7 cells by GR-->Akt-->Rhob signaling and Rhob negatively regulates the proliferation of RAW264.7 cells.
Collapse
Affiliation(s)
- Xiaohui Wang
- Department of Pathophysiology, Second Military Medical University, Shanghai, People's Republic of China
| | | | | | | | | | | | | |
Collapse
|
34
|
Yoon YS, Choo JH, Yoo T, Kang K, Chung JH. RhoB is epigenetically regulated in an age- and tissue-specific manner. Biochem Biophys Res Commun 2007; 362:164-169. [PMID: 17706596 DOI: 10.1016/j.bbrc.2007.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Accepted: 08/01/2007] [Indexed: 12/01/2022]
Abstract
RhoB, a member of the Rho family of small GTPases, regulates the organization of the actin cytoskeleton, malignant transformation, and genotoxic stress-induced signaling. In order to characterize epigenetic regulation of RhoB transcription during aging, the mRNA levels of RhoB were investigated using various mouse tissues of different ages. Bisulfite sequencing revealed that the CpG dinucleotide methylation patterns of the RhoB promoter region were not altered in skeletal muscle and lung during aging. ChIP analysis showed that levels of histone H3 and H4 acetylation were reduced in a tissue-specific manner during aging due to direct HDAC1 binding. Histone H3 lysine 9 trimethylation level and deposition of HP1beta increased in RhoB promoter during aging, whereas histone H3 lysine 4 dimethylation level gradually decreased. It was concluded that mouse RhoB transcription is epigenetically regulated in a tissue-specific manner during aging by histone modification, but not by CpG methylation.
Collapse
Affiliation(s)
- Young Soo Yoon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseoung-gu, Daejeon 305-701, South Korea
| | - Jung Ha Choo
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseoung-gu, Daejeon 305-701, South Korea
| | - Taekyung Yoo
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseoung-gu, Daejeon 305-701, South Korea
| | - Keunsoo Kang
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseoung-gu, Daejeon 305-701, South Korea
| | - Jae Hoon Chung
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 335 Gwahangno, Yuseoung-gu, Daejeon 305-701, South Korea.
| |
Collapse
|
35
|
Abstract
The CXCR2 chemokine receptor is a G-protein-coupled receptor that undergoes clathrin-mediated endocytosis upon ligand binding. The trafficking of CXCR2 is crucial for cells to maintain a proper chemotactic response. The mechanisms that regulate the recycling/degradation sorting decision are unknown. In this study, we used dominant-negative (T19N) and GTPase-deficient activated (Q63L) RhoB mutants, as well as RhoB small interfering RNA (siRNA) to investigate the role of RhoB in CXCR2 trafficking. Expression of either of the RhoB mutants or transfection of RhoB siRNA impaired CXCR2-mediated chemotaxis. Expression of RhoB T19N and transfection of RhoB siRNA impaired sorting of CXCR2 to the lysosome after 3 hours of CXCL8 stimulation and impaired CXCL8-induced CXCR2 degradation. In cells expressing the RhoB Q63L mutant, CXCR2 recycling through the Rab11a recycling compartment was impaired after 30 minutes of CXCL8 stimulation as was CXCL8-induced CXCR2 degradation. For cells expressing activated RhoB, CXCR2 colocalized with Rab4, a marker for the rapid recycling pathway, and with the mannose-6-phosphate receptor, which traffics between the trans-Golgi network and endosomes. These data suggest that CXCR2 recycles through alternative pathways. We conclude that oscillation of RhoB GTPase activity is essential for appropriate sorting decisions, and for directing CXCR2 degradation and recycling--events that are required for optimal chemotaxis.
Collapse
Affiliation(s)
- Nicole F. Neel
- Department of Veterans Affairs, Nashville, TN 37212-2637, USA
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Lynne A. Lapierre
- Department of Veterans Affairs, Nashville, TN 37212-2637, USA
- Department of Surgery, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - James R. Goldenring
- Department of Veterans Affairs, Nashville, TN 37212-2637, USA
- Department of Surgery, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
- Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| | - Ann Richmond
- Department of Veterans Affairs, Nashville, TN 37212-2637, USA
- Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN 37232, USA
| |
Collapse
|
36
|
Kajimoto H, Hashimoto K, Bonnet SN, Haromy A, Harry G, Moudgil R, Nakanishi T, Rebeyka I, Thébaud B, Michelakis ED, Archer SL. Oxygen activates the Rho/Rho-kinase pathway and induces RhoB and ROCK-1 expression in human and rabbit ductus arteriosus by increasing mitochondria-derived reactive oxygen species: a newly recognized mechanism for sustaining ductal constriction. Circulation 2007; 115:1777-88. [PMID: 17353442 DOI: 10.1161/circulationaha.106.649566] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Constriction of the ductus arteriosus (DA) is initiated at birth by inhibition of O2-sensitive K+ channels in DA smooth muscle cells. Subsequent membrane depolarization and calcium influx through L-type calcium channels initiates functional closure. We hypothesize that Rho-kinase activation is an additional mechanism that sustains DA constriction. METHODS AND RESULTS The effect of increased PO2 on the activity and expression of Rho-kinase was assessed in DAs from neonates with hypoplastic left-heart syndrome (n=15) and rabbits (339 term and 99 preterm rabbits). Rho-kinase inhibitors (Y-27632 and fasudil) prevent and reverse O2 constriction. Heterogeneity exists in the sensitivity of constrictors (PO2=endothelin=phenylephrine>KCl) and of fetal vessels (DA=pulmonary artery>aorta) to Rho-kinase inhibition. Inhibition of L-type calcium channels (nifedipine) or removal of extracellular calcium inhibits approximately two thirds of O2 constriction. Residual DA constriction reflects calcium sensitization, which persists after removal of extracellular calcium and blocking of sarcoplasmic reticulum Ca2+-ATPase. In term DA, an increase in PO2 activates Rho-kinase and thereby increases RhoB and ROCK-1 expression. Activation of Rho-kinase in DA smooth muscle cells is initiated by a PO2-dependent, rotenone-sensitive increase in mitochondrion-derived reactive O2 species. O2 effects on Rho-kinase are mimicked by exogenous H2O2. In preterm DAs, immaturity of mitochondrial reactive oxygen species generation is associated with reduced and delayed O2 constriction and lack of PO2-dependent upregulation of Rho-kinase expression. CONCLUSIONS O2 activates Rho-kinase and increases Rho-kinase expression in term DA smooth muscle cells by a redox-regulated, positive-feedback mechanism that promotes sustained vasoconstriction. Conversely, Rho-kinase inhibitors may be useful in maintaining DA patency, as a bridge to congenital heart surgery.
Collapse
Affiliation(s)
- Hidemi Kajimoto
- Vascular Biology Group, Alberta Cardiovascular and Stroke Research Centre (ABACUS), University of Alberta, Edmonton, Canada
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Lartey J, Smith M, Pawade J, Strachan B, Mellor H, López Bernal A. Up-regulation of myometrial RHO effector proteins (PKN1 and DIAPH1) and CPI-17 (PPP1R14A) phosphorylation in human pregnancy is associated with increased GTP-RHOA in spontaneous preterm labor. Biol Reprod 2007; 76:971-82. [PMID: 17301291 DOI: 10.1095/biolreprod.106.058982] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
RHO GTP-binding proteins are important regulators of actin-myosin interactions in uterine smooth muscle cells. Active (GTP-bound) RHOA binds to RHO-associated protein kinase (ROCK1), which inhibits the myosin-binding subunit (PPP1R12A) of myosin light chain phosphatase, leading to calcium-independent increases in myosin light chain phosphorylation and tension, which are termed "calcium sensitization." The RHO effector protein kinase N (PKN1) also increases calcium sensitization by phosphorylating the protein kinase C (PRKCB)-dependent protein CPI-17 (PPP1R14A) to inhibit the PPP1c subunit of myosin phosphatase. Moreover, other RHO proteins, such as RHOB, RHOD, and their effectors (DIAPH1 and DIAPH2), may modulate PKN1/ ROCK1 signaling to effect changes in myosin phosphatase activity and myosin light chain phosphorylation. The increases in contractile activity observed in term and preterm labor may be due to an increase in RHO activity and/or changes in RHO-related proteins. We found that the RHOA and RHOB mRNA levels in the myometrium were increased in pregnancy, although the expression levels of the RHOA and RHOB proteins did not change with pregnancy or labor. GTP-bound RHOA was increased in pregnancy, and this increase was significant in spontaneous preterm labor myometrium. PKN1 expression and PPP1R14A phosphorylation were dramatically increased in the pregnant myometrium. We also observed increases in DIAPH1 expression in spontaneous term and preterm labor myometrial tissues. The present study shows that human pregnancy is characterized by increases in PKN1 expression and PPP1R14A phosphorylation in the myometrium. Moreover, increases in GTP-bound RHOA and DIAPH1 expression may contribute to the increase in uterine activity in idiopathic preterm labor.
Collapse
Affiliation(s)
- J Lartey
- Clinical Sciences at South Bristol, Division of Obstetrics and Gynaecology, Henry Wellcome Laboratories for Integrative Neuroscience and Endocrinology, Dorothy Hodgkin Building, University of Bristol, Bristol BS1 3NY, United Kingdom
| | | | | | | | | | | |
Collapse
|
38
|
Loughlin J, Meulenbelt I, Min J, Mustafa Z, Sinsheimer JS, Carr A, Slagboom PE. Genetic association analysis of RHOB and TXNDC3 in osteoarthritis. Am J Hum Genet 2007; 80:383-6; author reply 386-7. [PMID: 17304710 PMCID: PMC1785353 DOI: 10.1086/511443] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
|
39
|
Shin JH, Lee EJ, Lee HR, Ryu SM, Kim HR, Chang CL, Kim YJ, Lee JN. Prevalence of non-tuberculous mycobacteria in a hospital environment. J Hosp Infect 2007; 65:143-8. [PMID: 17174440 DOI: 10.1016/j.jhin.2006.10.004] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2006] [Accepted: 10/12/2006] [Indexed: 11/27/2022]
Abstract
In recent years, non-tuberculous mycobacteria (NTM) have emerged as an important cause of opportunistic nosocomial infections but there is little known about the isolation and identification of NTM in Korea. The aim of this study was to assess the prevalence of NTM in the hospital environment and identify the species. A total of 150 samples were collected from different parts of the hospital. NTM were isolated and identified by restriction fragment length polymorphism analysis of the gene encoding rpoB and partial sequencing analysis of hsp65 and rpoB. In this study, 60 strains of NTM were isolated from 50 of the 150 samples. Half of the tap water samples (50 of 100) were positive for mycobacteria. An estimated 73.3% of the isolates were saprophytic, 21.7% were potentially pathogenic and 5% were unidentified. The presence of NTM in hospital tap water is not uncommon. Such water isolates might cause true nosocomial infection in immunocompromised patients, in addition to the risk of false-positive culture results.
Collapse
Affiliation(s)
- J H Shin
- Department of Laboratory Medicine, College of Medicine, Inje University, Inje University Busan Paik Hospital, Busan, Korea.
| | | | | | | | | | | | | | | |
Collapse
|
40
|
Chen YX, Li ZB, Diao F, Cao DM, Fu CC, Lu J. Up-regulation of RhoB by glucocorticoids and its effects on the cell proliferation and NF-kappaB transcriptional activity. J Steroid Biochem Mol Biol 2006; 101:179-87. [PMID: 17046241 DOI: 10.1016/j.jsbmb.2006.06.030] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2005] [Accepted: 06/23/2006] [Indexed: 11/27/2022]
Abstract
Although there is ample evidence that glucocorticoids (GCs) have an antiproliferative effect on many cell types, the molecular mechanism remains elusive. We reported in our previous study that Dex treatment led to cell growth arrest in a human ovarian cancer cell HO-8910. RhoB, as a member of Rho GTPases, have been implicated to be a negative regulator of cell proliferation. In this study, we provided novel evidence that Dex induced the expressions of small GTPase RhoB mRNA and protein, but not RhoA and RhoC mRNA in a dose- and time-dependent fashion via glucocorticoid receptor (GR). Over-expression of RhoB increased while inhibition of RhoB expression by RNA interference reversed Dex-induced growth arrest, indicating that RhoB signaling is involved in Dex-induced proliferation inhibition. We also presented the novel observation that over-expression or activation of RhoB signaling elevated the basal transcriptional activity of the transcription factor NF-kappaB in HO-8910 cells. Furthermore, elevating RhoB signaling enhanced the inhibitory effect of Dex on NF-kappaB activity, while attenuating RhoB signaling almost abrogated Dex suppression of NF-kappaB signaling, indicating that RhoB pathway is involved in the regulation of NF-kappaB activity and is essential for Dex transcriptional repression on NF-kappaB signaling in HO-8910 cells.
Collapse
Affiliation(s)
- Yu-Xia Chen
- Department of Pathophysiology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, PR China
| | | | | | | | | | | |
Collapse
|
41
|
Vignal E, de Santa Barbara P, Guémar L, Donnay JM, Fort P, Faure S. Expression of RhoB in the developing Xenopus laevis embryo. Gene Expr Patterns 2006; 7:282-8. [PMID: 17049930 DOI: 10.1016/j.modgep.2006.09.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2006] [Revised: 09/05/2006] [Accepted: 09/06/2006] [Indexed: 10/24/2022]
Abstract
Rho GTPases are signaling components that participate to the control of cell morphology, adhesion and motility through the regulation of F-actin cytoskeleton dynamics. In this paper, we report the identification of RhoB in Xenopus laevis (XRhoB) and its expression pattern during early development. Whole-mount in situ hybridization analysis indicated that XrhoB is expressed at high levels in the dorsal marginal zone early in gastrula and in the dorsal midline at later stages. At mid-neurula stages, XrhoB expression extends to the central nervous system, presomitic mesoderm and somites. Later during development, rhoB mRNA is detected in the eyes, the migrating neural crest cells as well as the dorso-lateral part of the somites.
Collapse
Affiliation(s)
- Emmanuel Vignal
- Centre de Recherches en Biochimie Macromoléculaire, FRE 2593 CNRS, 1919 route de Mende, 34293 Montpellier, France
| | | | | | | | | | | |
Collapse
|
42
|
Delarue FL, Adnane J, Joshi B, Blaskovich MA, Wang DA, Hawker J, Bizouarn F, Ohkanda J, Zhu K, Hamilton AD, Chellappan S, Sebti SM. Farnesyltransferase and geranylgeranyltransferase I inhibitors upregulate RhoB expression by HDAC1 dissociation, HAT association and histone acetylation of the RhoB promoter. Oncogene 2006; 26:633-40. [PMID: 16909123 DOI: 10.1038/sj.onc.1209819] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Recently, we have shown that RhoB suppresses EGFR-, ErbB2-, Ras- and Akt-mediated malignant transformation and metastasis. In this paper, we demonstrate that the novel antitumor agents farnesyltransferase inhibitors (FTIs) and geranylgeranyltransferase I inhibitors (GGTIs) upregulate RhoB expression in a wide spectrum of human cancer cells including those from pancreatic, breast, lung, colon, bladder and brain cancers. RhoB induction by FTI-277 and GGTI-298 occurs at the transcriptional level and is blocked by actinomycin D. Reverse transcription-PCR experiments documented that the increase in RhoB protein levels is due to an increase in RhoB transcription. Furthermore, treatment with FTIs and GGTIs of cancer cells results in HDAC1 dissociation, HAT association and histone acetylation of the RhoB promoter. Thus, promoter acetylation is a novel mechanism by which RhoB expression levels are regulated following treatment with the anticancer agents FTIs and GGTIs.
Collapse
Affiliation(s)
- F L Delarue
- Drug Discovery Program at H Lee Moffitt Cancer Center and Research Institute, Tampa, FL 33612, USA
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Mahr S, Burmester GR, Hilke D, Göbel U, Grützkau A, Häupl T, Hauschild M, Koczan D, Krenn V, Neidel J, Perka C, Radbruch A, Thiesen HJ, Müller B. Cis- and trans-acting gene regulation is associated with osteoarthritis. Am J Hum Genet 2006; 78:793-803. [PMID: 16642435 PMCID: PMC1474041 DOI: 10.1086/503849] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2005] [Accepted: 03/01/2006] [Indexed: 11/03/2022] Open
Abstract
Osteoarthritis (OA) is a complex disease of the skeleton and is associated with aging. Both environmental and genetic factors contribute to its pathogenesis. We set out to identify novel genes associated with OA, concentrating on regulatory polymorphisms allowing for differential expression. Our strategy to identify differentially expressed genes included an initial transcriptome analysis of the peripheral blood mononuclear cells of six patients with OA and six age-matched healthy controls. These were screened for allelic expression imbalances and potentially regulatory single-nucleotide polymorphisms (SNPs) in the 5' regions of the genes. To establish disease association, disparate promoter SNP distributions correlating with the differential expression were tested on larger cohorts. Our approach yielded 26 candidate genes differentially expressed between patients and controls. Whereas BLP2 and CIAS1 seem to be trans-regulated, as the absence of allelic expression imbalances suggests, the presence of allelic imbalances confirms cis-regulatory mechanisms for RHOB and TXNDC3. Interestingly, on/off-switching suggests additional trans-regulation for TXNDC3. Moreover, we demonstrate for RHOB and TXNDC3 statistically significant associations between 5' SNPs and the disease that hint at regulatory functions. Investigating the respective genes functionally will not only shed light on the disease association but will also add to the understanding of the pathogenic processes involved in OA and may point out novel therapeutic approaches.
Collapse
Affiliation(s)
| | | | | | - Udo Göbel
- Contact Software GmbH, Bremen, Germany
| | | | - Thomas Häupl
- Charité University Hospital, Medical Faculty, Humboldt University
| | - Matthias Hauschild
- Orthopedic Surgery, Medical Faculty, University of Rostock, Rostock, Germany
| | | | - Veit Krenn
- Charité University Hospital, Medical Faculty, Humboldt University
| | | | - Carsten Perka
- Charité University Hospital, Medical Faculty, Humboldt University
| | | | | | | |
Collapse
|
44
|
Abstract
RhoB is a mainly endosomal small GTPase that regulates actin organization and vesicle trafficking. Expression of RhoB is elevated rapidly by many stimuli, including growth factors, cytokines, and genotoxic stress. In cancer, RhoB can limit cell proliferation, survival, invasion, and metastasis, and during malignant progression its levels are attenuated commonly. In support of its role as a negative modifier of cancer progression, targeted deletion of RhoB in mice can increase tumor formation initiated by Ras mutation. How RhoB acts to suppress different aspects of cancer pathophysiology has emerged as a question of significant interest.
Collapse
Affiliation(s)
- M Huang
- Lankenau Institute for Medical Research, Jefferson Medical School, Thomas Jefferson University, Philadelphia, PA, USA
| | | |
Collapse
|
45
|
Sato N, Fukui T, Taniguchi T, Yokoyama T, Kondo M, Nagasaka T, Goto Y, Gao W, Ueda Y, Yokoi K, Minna JD, Osada H, Kondo Y, Sekido Y. RhoB is frequently downregulated in non-small-cell lung cancer and resides in the 2p24 homozygous deletion region of a lung cancer cell line. Int J Cancer 2006; 120:543-51. [PMID: 17096327 DOI: 10.1002/ijc.22328] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Identification of a homozygous deletion in cancer cells provides strong evidence for the location of a tumor suppressor gene (TSG). We analyzed the 2p24 homozygous deletion of a non-small-cell lung cancer (NSCLC) cell line, NCI-H2882, and found that the deletion size was 3.7 Mbp. Since RhoB, which has been suggested to be a candidate TSG, was located in this region, we analyzed RhoB for alterations in NSCLC. Although we found no mutations in 48 cell lines including 20 NSCLCs, a loss of heterozygosity (LOH) analysis in 128 primary NSCLCs showed that 25 of 62 informative samples had LOH at the RhoB locus. Northern blot analysis of 28 cell lines (including 15 NSCLCs) indicated that RhoB expression was downregulated in 27. We analyzed RhoB expression in 112 primary NSCLCs with immunohistochemistry and found no or a weak RhoB expression in 33 (42%) of 78 adenocarcinomas, whereas we found it in 29 (94%) of 31 squamous cell carcinomas. No or a weak expression of RhoB was more frequently observed in poorly- or moderately-differentiated adenocarcinomas than in well-differentiated ones (p = 0.0014). Furthermore, no or a weak expression of RhoB indicated a tendency to poor patient prognosis. Although hypermethylation was not found at the promoter region, the RhoB expression in NSCLC cell lines was induced by histone deacetylase inhibition, suggesting that RhoB downregulation may be due to histone modification. The present study demonstrates that RhoB expression is frequently downregulated in NSCLCs by multiple mechanisms, suggesting that RhoB is a candidate TSG for NSCLC.
Collapse
MESH Headings
- Aged
- Blotting, Northern
- Carcinoma, Non-Small-Cell Lung/genetics
- Carcinoma, Non-Small-Cell Lung/metabolism
- Carcinoma, Non-Small-Cell Lung/pathology
- Cell Line, Tumor
- Chromosome Deletion
- Chromosome Mapping
- Chromosomes, Human, Pair 2/genetics
- DNA Methylation
- Down-Regulation/drug effects
- Down-Regulation/genetics
- Female
- Gene Expression Regulation, Neoplastic/drug effects
- Gene Expression Regulation, Neoplastic/genetics
- Histone Deacetylase Inhibitors
- Humans
- Hydroxamic Acids/pharmacology
- Immunohistochemistry
- Kaplan-Meier Estimate
- Loss of Heterozygosity
- Lung Neoplasms/genetics
- Lung Neoplasms/metabolism
- Lung Neoplasms/pathology
- Male
- Microsatellite Repeats
- Middle Aged
- Prognosis
- Promoter Regions, Genetic/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- rhoB GTP-Binding Protein/genetics
- rhoB GTP-Binding Protein/metabolism
Collapse
Affiliation(s)
- Naohito Sato
- Division of Molecular Oncology, Aichi Cancer Center Research Institute, Nagoya, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Milia J, Teyssier F, Dalenc F, Ader I, Delmas C, Pradines A, Lajoie-Mazenc I, Baron R, Bonnet J, Cohen-Jonathan E, Favre G, Toulas C. Farnesylated RhoB inhibits radiation-induced mitotic cell death and controls radiation-induced centrosome overduplication. Cell Death Differ 2005; 12:492-501. [PMID: 15776002 DOI: 10.1038/sj.cdd.4401586] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Our previous results demonstrated that expressing the GTPase ras homolog gene family, member B (RhoB) in radiosensitive NIH3T3 cells increases their survival following 2 Gy irradiation (SF2). We have first demonstrated here that RhoB expression inhibits radiation-induced mitotic cell death. RhoB is present in both a farnesylated and a geranylgeranylated form in vivo. By expressing RhoB mutants encoding for farnesylated (RhoB-F cells), geranylgeranylated or the CAAX deleted form of RhoB, we have then shown that only RhoB-F expression was able to increase the SF2 value by reducing the sensitivity of these cells to radiation-induced mitotic cell death. Moreover, RhoB-F cells showed an increased G2 arrest and an inhibition of centrosome overduplication following irradiation mediated by the Rho-kinase, strongly suggesting that RhoB-F may control centrosome overduplication during the G2 arrest after irradiation. Overall, our results for the first time clearly implicate farnesylated RhoB as a crucial protein in mediating cellular resistance to radiation-induced nonapoptotic cell death.
Collapse
Affiliation(s)
- J Milia
- INSERM U563, CPTP, Département d'Innovation Thérapeutique et d'Oncologie Moléculaire, Institut Claudius Regaud, 20-24 rue du Pont St Pierre, 31052 Toulouse Cedex, France
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Maeda S, Matsuoka I, Iwamoto T, Kurose H, Kimura J. Down-Regulation of Na+/Ca2+Exchanger by Fluvastatin in Rat Cardiomyoblast H9c2 Cells: Involvement of RhoB in Na+/Ca2+Exchanger mRNA Stability. Mol Pharmacol 2005; 68:414-20. [PMID: 15879517 DOI: 10.1124/mol.104.000786] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We investigated the effect of fluvastatin (Flv), an HMG-CoA reductase inhibitor, on Na(+)/Ca(2+) exchanger 1 (NCX1) expression in H9c2 cardiomyoblasts. Reverse transcriptase-polymerase chain reaction analyses revealed that Flv decreased NCX1 mRNA in a concentration- and time-dependent manner and NCX1 protein. This effect of Flv was caused by the inhibition of HMG-CoA reductase, because Flv did not affect the NCX1 mRNA in the presence of mevalonate. Flv-induced down-regulation of NCX1 mRNA was also cancelled by farnesyl pyrophosphate (FPP) and geranylgeranyl pyrophosphate (GGPP), suggesting an involvement of small G-proteins. However, overexpression of neither constitutive active RhoA nor Ras affected NCX1 mRNA. In contrast, intracellular expression of C3 toxin, a specific inhibitor of Rho family proteins, decreased NCX1 mRNA, suggesting that Flv decreases NCX1 mRNA by inhibiting a signaling pathway of Rho family proteins other than RhoA. On the other hand, lysophosphatidylcholine (LPC), an activator of Rho signaling, increased both NCX1 mRNA and protein in a C3 toxin-sensitive manner. Western blot analyses revealed that membrane-associated RhoB, which is isoprenylated by either FPP or GGPP, was decreased by Flv but was increased by LPC. Selective inhibition of gene expression by short interfering RNA duplex showed that RhoB but not RhoA is involved in the regulation of NCX1 mRNA and protein. When transcription was blocked by 5,6-dichlorobenzimidazole riboside, the NCX1 mRNA stability was decreased by Flv. Long-term treatment of rat with Flv in vivo also down-regulated the cardiac NCX1 mRNA. These results suggest that a RhoB-mediated signaling pathway regulates cardiac NCX1 levels by controlling the NCX1 mRNA stability.
Collapse
Affiliation(s)
- Sachiko Maeda
- Department of Pharmacology, Fukushima Medical University School of Medicine, Fukushima, 960-1295, Japan
| | | | | | | | | |
Collapse
|
48
|
Mazières J, Tillement V, Allal C, Clanet C, Bobin L, Chen Z, Sebti SM, Favre G, Pradines A. Geranylgeranylated, but not farnesylated, RhoB suppresses Ras transformation of NIH-3T3 cells. Exp Cell Res 2005; 304:354-64. [PMID: 15748883 DOI: 10.1016/j.yexcr.2004.10.019] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2004] [Revised: 10/19/2004] [Accepted: 10/25/2004] [Indexed: 10/26/2022]
Abstract
RhoB is a low molecular weight GTPase that is both farnesylated (RhoB-F) and geranylgeranylated (RhoB-GG) in cells. Based on data from rodent cell models, it has been suggested that RhoB displays differential effects on cell transformation, according to the nature of its prenylation. To test directly this hypothesis, we generated GTPase-deficient RhoB mutants that are exclusively either farnesylated or geranylgeranylated. We show that in Ras-transformed murine NIH-3T3 cells, RhoB-F enhances, whereas RhoB-GG and RhoB (F/GG) suppresses anchorage-dependent and -independent cell growth as well as tumor growth in nude mice. We then demonstrate that Ras constitutive activation of the tumor survival pathways Akt and NF-kappa B are blocked by RhoB-GG, but not by RhoB-F, providing further support for the opposing role of RhoB-F and RhoB-GG in Ras malignant transformation in NIH-3T3 cells. In addition, both RhoB (F/GG) and RhoB-GG induce apoptosis in Ras-transformed NIH-3T3 cells whereas RhoB-F has no effect. Our data demonstrate that RhoB-F and RhoB-GG which differ only by a 5-carbon isoprene behave differently in rodent cells highlighting the important role of prenyl groups in protein function and emphasize the potency of RhoB to regulate negatively the oncogenic signal.
Collapse
Affiliation(s)
- Julien Mazières
- Département Innovation Thérapeutique et Oncologie Moléculaire, Centre de Physiopathologie Toulouse Purpan INSERM U563, Institut Claudius Regaud, 20-24 rue du Pont Saint-Pierre, 31052 Toulouse cedex, France
| | | | | | | | | | | | | | | | | |
Collapse
|
49
|
Cheung M, Chaboissier MC, Mynett A, Hirst E, Schedl A, Briscoe J. The transcriptional control of trunk neural crest induction, survival, and delamination. Dev Cell 2005; 8:179-92. [PMID: 15691760 DOI: 10.1016/j.devcel.2004.12.010] [Citation(s) in RCA: 281] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2004] [Revised: 11/16/2004] [Accepted: 12/13/2004] [Indexed: 12/26/2022]
Abstract
Trunk neural crest cells are generated at the border between the neural plate and nonneural ectoderm, where they initiate a distinct program of gene expression, undergo an epithelial-mesenchymal transition (EMT), and delaminate from the neuroepithelium. Here, we provide evidence that members of three families of transcription induce these properties in premigratory neural crest cells. Sox9 acts to provide the competence for neural crest cells to undergo an EMT and is required for trunk neural crest survival. In the absence of Sox9, cells apoptose prior to or shortly after delamination. Slug/Snail, in the presence of Sox9, is sufficient to induce an EMT in neural epithelial cells, while FoxD3 regulates the expression of cell-cell adhesion molecules required for neural crest migration. Together, the data suggest a model in which a combination of transcription factors regulates the acquisition of the diverse properties of neural crest cells.
Collapse
Affiliation(s)
- Martin Cheung
- Developmental Neurobiology, National Institute for Medical Research, Mill Hill, London, NW7 1AA, UK
| | | | | | | | | | | |
Collapse
|
50
|
Abstract
RhoB is a small GTP-binding protein that is involved in apoptotic signal transduction. We have cloned the mouse RhoB mRNA including a 1377 nucleotide 3'-untranslated region (UTR) that contains six AU-rich elements (AREs) as well as several uridine-rich stretches. There is 94% homology overall between the mouse and rat RhoB genes and 92% homology between the mouse and a putative human clone. Ultraviolet light (UVL) induces RhoB production through regulated changes in gene transcription and mRNA stabilization although the latter mechanism is unknown. We observed that UVL increased the half-life of RhoB mRNA from 63 min to 3.3 h in NIH/3T3 cells and from 87 min to 2.7 h in normal human keratinocyte cells. In vitro mobility shift assays demonstrated that HuR bound the 3'-UTR of RhoB at three distinct locations (nucleotides 1342-1696, 1765-1920 and 1897-1977) suggesting a regulatory role for this RNA-binding protein. HuR immunoprecipitations were positive for RhoB mRNA indicating an in vivo association, and Western blot analysis and immunofluorescence demonstrated that HuR rapidly partitions from the nucleus to the cytoplasm after UVL. Therefore, we propose a model in which UVL induces stress-activated signal transduction leading to nuclear/cytoplasmic shuttling of HuR and subsequent stabilization of RhoB mRNA.
Collapse
Affiliation(s)
- Cara J Westmark
- Department of Pathology and Laboratory Medicine, Waisman Center for Developmental Disabilities, University of Wisconsin, Madison, WI 53705, USA
| | | | | |
Collapse
|