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Tessari A, Soliman SHA, Orlacchio A, Capece M, Amann JM, Visone R, Carbone DP, Palmieri D, Coppola V. RANBP9 as potential therapeutic target in non-small cell lung cancer. JOURNAL OF CANCER METASTASIS AND TREATMENT 2020; 6. [PMID: 34778565 PMCID: PMC8589326 DOI: 10.20517/2394-4722.2020.32] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Non-small cell lung cancer (NSCLC) remains the leading cause of cancer-related deaths in the Western world. Despite progress made with targeted therapies and immune checkpoint inhibitors, the vast majority of patients have to undergo chemotherapy with platinum-based drugs. To increase efficacy and reduce potential side effects, a more comprehensive understanding of the mechanisms of the DNA damage response (DDR) is required. We have shown that overexpressby live cell imaging (Incuyion of the scaffold protein RAN binding protein 9 (RANBP9) is pervasive in NSCLC. More importantly, patients with higher levels of RANBP9 exhibit a worse outcome from treatment with platinum-based drugs. Mechanistically, RANBP9 exists as a target and an enabler of the ataxia telangiectasia mutated (ATM) kinase signaling. Indeed, the depletion of RANBP9 in NSCLC cells abates ATM activation and its downstream targets such as pby live cell imaging (Incuy53 signaling. RANBP9 knockout cells are more sensitive than controls to the inhibition of the ataxia and telangiectasia-related (ATR) kinase but not to ATM inhibition. The absence of RANBP9 renders cells more sensitive to drugs inhibiting the Poly(ADP-ribose)-Polymerase (PARP) resulting in a "BRCAness-like" phenotype. In summary, as a result of increased sensitivity to DNA damaging drugs conferred by its ablation in vitro and in vivo, RANBP9 may be considered as a potential target for the treatment of NSCLC. This article aims to report the results from past and ongoing investigations focused on the role of RANBP9 in the response to DNA damage, particularly in the context of NSCLC. This review concludes with future directions and speculative remarks which will need to be addressed in the coming years.
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Affiliation(s)
- Anna Tessari
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Shimaa H A Soliman
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA.,Department of Medicine, Dentistry and Biotechnology, G. d'Annunzio University of Chieti, Chieti 66100, Italy.,Current address: Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Arturo Orlacchio
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Marina Capece
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Joseph M Amann
- Current address: Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Rosa Visone
- Department of Medicine, Dentistry and Biotechnology, G. d'Annunzio University of Chieti, Chieti 66100, Italy
| | - David P Carbone
- Division of Medical Oncology, Department of Internal Medicine, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Dario Palmieri
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
| | - Vincenzo Coppola
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and Arthur G. James Comprehensive Cancer Center, Columbus, OH 43210, USA
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Salemi LM, Maitland MER, McTavish CJ, Schild-Poulter C. Cell signalling pathway regulation by RanBPM: molecular insights and disease implications. Open Biol 2018; 7:rsob.170081. [PMID: 28659384 PMCID: PMC5493780 DOI: 10.1098/rsob.170081] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2017] [Accepted: 06/01/2017] [Indexed: 12/25/2022] Open
Abstract
RanBPM (Ran-binding protein M, also called RanBP9) is an evolutionarily conserved, ubiquitous protein which localizes to both nucleus and cytoplasm. RanBPM has been implicated in the regulation of a number of signalling pathways to regulate several cellular processes such as apoptosis, cell adhesion, migration as well as transcription, and plays a critical role during development. In addition, RanBPM has been shown to regulate pathways implicated in cancer and Alzheimer's disease, implying that RanBPM has important functions in both normal and pathological development. While its functions in these processes are still poorly understood, RanBPM has been identified as a component of a large complex, termed the CTLH (C-terminal to LisH) complex. The yeast homologue of this complex functions as an E3 ubiquitin ligase that targets enzymes of the gluconeogenesis pathway. While the CTLH complex E3 ubiquitin ligase activity and substrates still remain to be characterized, the high level of conservation between the complexes in yeast and mammals infers that the CTLH complex could also serve to promote the degradation of specific substrates through ubiquitination, therefore suggesting the possibility that RanBPM's various functions may be mediated through the activity of the CTLH complex.
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Affiliation(s)
- Louisa M Salemi
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Matthew E R Maitland
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Christina J McTavish
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
| | - Caroline Schild-Poulter
- Robarts Research Institute, Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, 1151 Richmond Street North, London, Ontario, Canada N6A 5B7
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Palmieri D, Tessari A, Coppola V. Scorpins in the DNA Damage Response. Int J Mol Sci 2018; 19:ijms19061794. [PMID: 29914204 PMCID: PMC6032341 DOI: 10.3390/ijms19061794] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 06/11/2018] [Accepted: 06/14/2018] [Indexed: 12/19/2022] Open
Abstract
The DNA Damage Response (DDR) is a complex signaling network that comes into play when cells experience genotoxic stress. Upon DNA damage, cellular signaling pathways are rewired to slow down cell cycle progression and allow recovery. However, when the damage is beyond repair, cells activate complex and still not fully understood mechanisms, leading to a complete proliferative arrest or cell death. Several conventional and novel anti-neoplastic treatments rely on causing DNA damage or on the inhibition of the DDR in cancer cells. However, the identification of molecular determinants directing cancer cells toward recovery or death upon DNA damage is still far from complete, and it is object of intense investigation. SPRY-containing RAN binding Proteins (Scorpins) RANBP9 and RANBP10 are evolutionarily conserved and ubiquitously expressed proteins whose biological functions are still debated. RANBP9 has been previously implicated in cell proliferation, survival, apoptosis and migration. Recent studies also showed that RANBP9 is involved in the Ataxia Telangiectasia Mutated (ATM) signaling upon DNA damage. Accordingly, cells lacking RANBP9 show increased sensitivity to genotoxic treatment. Although there is no published evidence, extensive protein similarities suggest that RANBP10 might have partially overlapping functions with RANBP9. Like RANBP9, RANBP10 bears sites putative target of PIK-kinases and high throughput studies found RANBP10 to be phosphorylated following genotoxic stress. Therefore, this second Scorpin might be another overlooked player of the DDR alone or in combination with RANBP9. This review focuses on the relatively unknown role played by RANBP9 and RANBP10 in responding to genotoxic stress.
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Affiliation(s)
- Dario Palmieri
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and James Comprehensive Cancer Center, Columbus, OH 43210, USA.
| | - Anna Tessari
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and James Comprehensive Cancer Center, Columbus, OH 43210, USA.
| | - Vincenzo Coppola
- Department of Cancer Biology and Genetics, College of Medicine, The Ohio State University and James Comprehensive Cancer Center, Columbus, OH 43210, USA.
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Salemi LM, Almawi AW, Lefebvre KJ, Schild-Poulter C. Aggresome formation is regulated by RanBPM through an interaction with HDAC6. Biol Open 2014; 3:418-30. [PMID: 24795145 PMCID: PMC4058076 DOI: 10.1242/bio.20147021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
In conditions of proteasomal impairment, the build-up of damaged or misfolded proteins activates a cellular response leading to the recruitment of damaged proteins into perinuclear aggregates called aggresomes. Aggresome formation involves the retrograde transport of cargo proteins along the microtubule network and is dependent on the histone deacetylase HDAC6. Here we show that ionizing radiation (IR) promotes Ran-Binding Protein M (RanBPM) relocalization into discrete perinuclear foci where it co-localizes with aggresome components ubiquitin, dynein and HDAC6, suggesting that the RanBPM perinuclear clusters correspond to aggresomes. RanBPM was also recruited to aggresomes following treatment with the proteasome inhibitor MG132 and the DNA-damaging agent etoposide. Strikingly, aggresome formation by HDAC6 was markedly impaired in RanBPM shRNA cells, but was restored by re-expression of RanBPM. RanBPM was found to interact with HDAC6 and to inhibit its deacetylase activity. This interaction was abrogated by a RanBPM deletion of its LisH/CTLH domain, which also prevented aggresome formation, suggesting that RanBPM promotes aggresome formation through an association with HDAC6. Our results suggest that RanBPM regulates HDAC6 activity and is a central regulator of aggresome formation.
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Affiliation(s)
- Louisa M Salemi
- Robarts Research Institute, The University of Western Ontario, London, ON N6A 5B7, Canada Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5C1, Canada
| | - Ahmad W Almawi
- Robarts Research Institute, The University of Western Ontario, London, ON N6A 5B7, Canada Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5C1, Canada
| | - Karen J Lefebvre
- Robarts Research Institute, The University of Western Ontario, London, ON N6A 5B7, Canada Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5C1, Canada
| | - Caroline Schild-Poulter
- Robarts Research Institute, The University of Western Ontario, London, ON N6A 5B7, Canada Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, ON N6A 5C1, Canada
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Tsioras K, Papastefanaki F, Politis PK, Matsas R, Gaitanou M. Functional Interactions between BM88/Cend1, Ran-binding protein M and Dyrk1B kinase affect cyclin D1 levels and cell cycle progression/exit in mouse neuroblastoma cells. PLoS One 2013; 8:e82172. [PMID: 24312406 PMCID: PMC3842983 DOI: 10.1371/journal.pone.0082172] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 10/31/2013] [Indexed: 12/22/2022] Open
Abstract
BM88/Cend1 is a neuronal-lineage specific modulator with a pivotal role in coordination of cell cycle exit and differentiation of neuronal precursors. In the current study we identified the signal transduction scaffolding protein Ran-binding protein M (RanBPM) as a BM88/Cend1 binding partner and showed that BM88/Cend1, RanBPM and the dual specificity tyrosine-phosphorylation regulated kinase 1B (Dyrk1B) are expressed in mouse brain as well as in cultured embryonic cortical neurons while RanBPM can form complexes with either of the two other proteins. To elucidate a potential mechanism involving BM88/Cend1, RanBPM and Dyrk1B in cell cycle progression/exit, we transiently co-expressed these proteins in mouse neuroblastoma Neuro 2a cells. We found that the BM88/Cend1-dependent or Dyrk1B-dependent down-regulation of cyclin D1 is reversed following their functional interaction with RanBPM. More specifically, functional interaction of RanBPM with either BM88/Cend1 or Dyrk1B stabilizes cyclin D1 in the nucleus and promotes 5-bromo-2'-deoxyuridine (BrdU) incorporation as a measure of enhanced cell proliferation. However, the RanBPM-dependent Dyrk1B cytosolic retention and degradation is reverted in the presence of Cend1 resulting in cyclin D1 destabilization. Co-expression of RanBPM with either BM88/Cend1 or Dyrk1B also had a negative effect on Neuro 2a cell differentiation. Our results suggest that functional interactions between BM88/Cend1, RanBPM and Dyrk1B affect the balance between cellular proliferation and differentiation in Neuro 2a cells and indicate that a potentially similar mechanism may influence cell cycle progression/exit and differentiation of neuronal precursors.
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Affiliation(s)
- Konstantinos Tsioras
- Laboratory of Cellular and Molecular Neurobiology, Hellenic Pasteur Institute, Athens, Greece
| | - Florentia Papastefanaki
- Laboratory of Cellular and Molecular Neurobiology, Hellenic Pasteur Institute, Athens, Greece
| | - Panagiotis K. Politis
- Center for Basic Research, Biomedical Research Foundation, Academy of Athens, Athens, Greece
| | - Rebecca Matsas
- Laboratory of Cellular and Molecular Neurobiology, Hellenic Pasteur Institute, Athens, Greece
| | - Maria Gaitanou
- Laboratory of Cellular and Molecular Neurobiology, Hellenic Pasteur Institute, Athens, Greece
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6
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Abstract
Ran-binding protein M (RanBPM) is a nucleocytoplasmic protein of yet unknown function. We have previously shown that RanBPM inhibits expression of the anti-apoptotic factor Bcl-2 and promotes apoptosis induced by DNA damage. Here we show that the effects of RanBPM on Bcl-2 expression occur through a regulation of the ERK signaling pathway. Transient and stable down-regulation of RanBPM stimulated ERK phosphorylation, leading to Bcl-2 up-regulation, while re-expression of RanBPM reversed these effects. RanBPM was found to inhibit MEK and ERK activation induced by ectopic expression of active RasV12. Activation of ERK by active c-Raf was also prevented by RanBPM. Expression of RanBPM correlated with a marked decrease in the protein levels of ectopically expressed active c-Raf and also affected the expression of endogenous c-Raf. RanBPM formed a complex with both active c-Raf, consisting of the C-terminal kinase domain, and endogenous c-Raf in mammalian cells. In addition, RanBPM was found to decrease the binding of Hsp90 to c-Raf. Finally, we show that loss of RanBPM expression confers increased cell proliferation and cell migration properties to HEK293 cells. Altogether, these findings establish RanBPM as a novel inhibitor of the ERK pathway through an interaction with the c-Raf complex and a regulation of c-Raf stability, and provide evidence that RanBPM loss of expression results in constitutive activation of the ERK pathway and promotes cellular events leading to cellular transformation and tumorigenesis.
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Affiliation(s)
| | - Caroline Schild-Poulter
- Robarts Research Institute and Department of Biochemistry, Schulich School of Medicine and Dentistry, The University of Western Ontario, London, Ontario, Canada
- * E-mail:
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7
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Zou F, Xu J, Fu H, Cao J, Mao H, Gong M, Cui G, Zhang Y, Shi W, Chen J. Different functions of HIPK2 and CtBP2 in traumatic brain injury. J Mol Neurosci 2012; 49:395-408. [PMID: 23076816 DOI: 10.1007/s12031-012-9906-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2012] [Accepted: 10/09/2012] [Indexed: 01/09/2023]
Abstract
Traumatic brain injury (TBI) initiates a complex series of neurochemical and signaling changes that lead to neuronal dysfunction and over-reactive astrocytes. In our study, homeodomain interacting protein kinase 2 (HIPK2) can interact with C-terminal binding protein 2 (CtBP2) in rat brain, which is a component of Wnt-regulated transcription. Up to now, the functions of HIPK2 and CtBP2 in CNS are still with limited acquaintance. In our study, we found that the interaction between HIPK2 and CtBP2 was involved in central nervous system (CNS) injury and repair. We performed an acute TBI model in adult rats. Western blot and immunohistochemistry analysis revealed that both HIPK2 and CtBP2 significantly increased in the peritrauma brain cortex in comparison to contralateral cerebral cortex. And immunofluorescence double-labeling revealed that HIPK2 was mainly co-expressed with NeuN but less GFAP. Meanwhile, we also examined that the expression profiles of active-caspase-3 was correlated with the expression of HIPK2 and the expression profiles of the proliferating cell nuclear antigen (PCNA) was correlated with the expression of CtBP2. HIPK2 participated in apoptosis of neurons, but CtBP2 was associated with the activation and proliferation of astrocytes. Immunoprecipitation further showed that they enhanced the interaction with each other in the pathophysiology process. In conclusion, this was the first description that HIPK2 interacted with CtBP2 in traumatic brains. Our data suggest that HIPK2 and CtBP2 might play important roles in CNS pathophysiology after TBI, and might provide a basis for the further study on their roles in regulating the prognosis after TBI.
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Affiliation(s)
- Feihui Zou
- Department of Neurology, Surgical Comprehensive Laboratory Affiliated Hospital of Nantong University, 19 Qi-Xiu Road, Nantong, Jiangsu Province, 226001, China
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8
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Suresh B, Ramakrishna S, Baek KH. Diverse roles of the scaffolding protein RanBPM. Drug Discov Today 2011; 17:379-87. [PMID: 22094242 DOI: 10.1016/j.drudis.2011.10.030] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 10/08/2011] [Accepted: 10/31/2011] [Indexed: 11/27/2022]
Abstract
Ran-binding protein microtubule-organizing center (RanBPM) appears to function as a scaffolding protein in several signal transduction pathways. RanBPM is a crucial component of multiprotein complexes that regulate the cellular function by modulating and/or assembling with a wide range of proteins in different intracellular regions and thereby mediate diverse cellular functions. This suggests a role for RanBPM as a scaffolding protein. In this article, we have summarized the diverse functions of RanBPM and its interacting partners that have been investigated to date. Also, we have categorized the role of RanBPM into four divisions: RanBPM as a modulator/protein stabilizer, regulator of transcription activity, cell cycle and neurological functions.
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Affiliation(s)
- Bharathi Suresh
- Department of Biomedical Science, CHA University, CHA General Hospital, Seoul 135-081, Republic of Korea
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Suresh B, Ramakrishna S, Kim YS, Kim SM, Kim MS, Baek KH. Stability and function of mammalian lethal giant larvae-1 oncoprotein are regulated by the scaffolding protein RanBPM. J Biol Chem 2010; 285:35340-9. [PMID: 20829363 DOI: 10.1074/jbc.m110.156836] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The evolutionarily conserved lethal giant larvae (Lgl) tumor suppressor gene has an essential role in establishing apical-basal cell polarity, cell proliferation, differentiation, and tissue organization. However, the precise molecular mechanism by which the Lgl carries out its function remains obscure. In the current study, we have identified Ran-binding protein M (RanBPM) as a novel binding partner of Mgl-1, a mammalian homolog of Drosophila tumor suppressor protein lethal (2) giant larvae (L(2)gl) by yeast two-hybrid screening. RanBPM seems to act as a scaffolding protein with a modulatory function with respect to Mgl-1. The Mgl-1 and RanBPM association was confirmed by co-immunoprecipitation and GST pull-down experiments. Additionally, expression of RanBPM resulted in inhibition of Mgl-1 degradation, and thereby extended the half-life of Mgl-1. Furthermore, the ability of Mgl-1 activity in cell migration and colony formation assay was enhanced by RanBPM. Taken together, our findings reveal that RanBPM plays a novel role in regulating Mgl-1 stability and contributes to its biological function as a tumor suppressor.
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Affiliation(s)
- Bharathi Suresh
- Department of Biomedical Science, CHA University, CHA General Hospital, Seoul 135-081, Korea
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Atabakhsh E, Bryce DM, Lefebvre KJ, Schild-Poulter C. RanBPM Has Proapoptotic Activities That Regulate Cell Death Pathways in Response to DNA Damage. Mol Cancer Res 2009; 7:1962-72. [DOI: 10.1158/1541-7786.mcr-09-0098] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Rodriguez FJ, Giannini C, Asmann YW, Sharma MK, Perry A, Tibbetts KM, Jenkins RB, Scheithauer BW, Anant S, Jenkins S, Eberhart CG, Sarkaria JN, Gutmann DH. Gene expression profiling of NF-1-associated and sporadic pilocytic astrocytoma identifies aldehyde dehydrogenase 1 family member L1 (ALDH1L1) as an underexpressed candidate biomarker in aggressive subtypes. J Neuropathol Exp Neurol 2008; 67:1194-204. [PMID: 19018242 PMCID: PMC2730602 DOI: 10.1097/nen.0b013e31818fbe1e] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Pilocytic astrocytomas (PAs) are World Health Organization Grade I gliomas; they most often affect children and young adults and occur in patients with neurofibromatosis type 1 (NF1). To identify genes that are differentially expressed in sporadic (S-PA) versus NF1-associated PAs (NF1-PAs) and those that might reflect differences in clinical behavior, we performed gene expression profiling using Affymetrix U133 Plus2.0 GeneChip arrays in 36 S-PAs and 11 NF1-PAs. Thirteen genes were overexpressed, and another 13 genes were underexpressed in NF1-PAs relative to S-PAs. Immunohistochemical studies performed on 103 tumors, representing 2 independently generated tissue microarrays, confirmed the differential expression of CUGBP2 (p = 0.0014), RANBP9 (p = 0.0075), ITGAV1 (p = 0.0001), and INFGR1 (p = 0.024) proteins. One of the underexpressed genes, aldehyde dehydrogenase 1 family member L1 (ALDH1L1), was also reduced in clinically aggressive compared with typical PAs (p = 0.01) and in PAs with increased cellularity and necrosis. Furthermore, in an additional independent set of tumors, weak to absent ALDH1L1 expression was found in 13 (72%) of 18 clinically aggressive PAs, in 8 (89%) of 9 PAs with pilomyxoid features, in 7 (70%) of 10 PAs with anaplastic transformation, and in 16 (76%) of 21 diffusely infiltrating astrocytomas of various grades. In summary, we have identified a molecular signature that distinguishes NF1-PA from S-PA and found that ALDH1L1 underexpression is associated with aggressive histology and/or biologic behavior.
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Affiliation(s)
- Fausto J Rodriguez
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota 55905, USA.
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Rinaldo C, Siepi F, Prodosmo A, Soddu S. HIPKs: Jack of all trades in basic nuclear activities. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2008; 1783:2124-9. [PMID: 18606197 DOI: 10.1016/j.bbamcr.2008.06.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2008] [Revised: 05/26/2008] [Accepted: 06/10/2008] [Indexed: 10/21/2022]
Abstract
Over the past decade several investigators have reported on the physical interaction of serine/threonine kinases of the homeodomain interacting-protein family (HIPKs) with increasing number of nuclear factors and on their localization in different nuclear sub-compartments. Although we are still far from a global understanding of the molecular consequences of HIPK subnuclear compartmentalization, the spatial description of particular interactions and posttranslational modifications promoted by these kinases on key cellular regulators might provide relevant insights. Here we will discuss the possible implications of the HIPK subnuclear localization in the regulation of gene transcription and in the cell response to stress.
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Affiliation(s)
- Cinzia Rinaldo
- Department of Experimental Oncology, Regina Elena Cancer Institute, 00158 Rome, Italy
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13
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AL-BEITI MAM, LU X. Expression of HIPK2 in cervical cancer: Correlation with clinicopathology and prognosis. Aust N Z J Obstet Gynaecol 2008; 48:329-36. [DOI: 10.1111/j.1479-828x.2008.00874.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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14
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Haase A, Nordmann C, Sedehizade F, Borrmann C, Reiser G. RanBPM, a novel interaction partner of the brain-specific protein p42IP4/centaurin α-1. J Neurochem 2008; 105:2237-48. [DOI: 10.1111/j.1471-4159.2008.05308.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Murrin LC, Talbot JN. RanBPM, a scaffolding protein in the immune and nervous systems. J Neuroimmune Pharmacol 2007; 2:290-5. [PMID: 18040864 DOI: 10.1007/s11481-007-9079-x] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2007] [Accepted: 05/29/2007] [Indexed: 01/23/2023]
Abstract
We review the literature for Ran Binding Protein in the Microtubule-Organizing Center (RanBPM; RanBP9), a 90-kDa protein that possesses many characteristics of a scaffolding protein, including protein-interaction motifs, a cytoskeletal-binding domain, and multiple canonical docking sites for signaling intermediates. We focus on studies that have examined functional interactions between RanBPM and other proteins. These studies suggest that RanBPM provides a platform for the interaction of a variety of signaling proteins, including cell surface receptors, nuclear receptors, nuclear transcription factors, and cytosolic kinases. These studies indicate that RanBPM acts as a scaffolding protein and is important in regulating cellular function in both the immune system and the nervous system.
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Affiliation(s)
- L Charles Murrin
- Department of Pharmacology and Experimental Neuroscience, 985800 Nebraska Medical Center, Omaha, NE 68198-5800, USA.
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Kobayashi N, Yang J, Ueda A, Suzuki T, Tomaru K, Takeno M, Okuda K, Ishigatsubo Y. RanBPM, Muskelin, p48EMLP, p44CTLH, and the armadillo-repeat proteins ARMC8alpha and ARMC8beta are components of the CTLH complex. Gene 2007; 396:236-47. [PMID: 17467196 DOI: 10.1016/j.gene.2007.02.032] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2006] [Revised: 02/13/2007] [Accepted: 02/23/2007] [Indexed: 11/17/2022]
Abstract
Ran-binding protein in microtubule organising centre (RanBPM) was originally isolated as a protein that binds to the small GTPase Ran. Recently our group and other groups reported that RanBPM was associated with several proteins and composed a large protein complex. Here, we used tandem MS with an antibody against RanBPM to purify this complex from a soluble extract of HEK293 cells: we identified Muskelin, p48EMLP, p44CTLH, and the novel armadillo-repeat proteins ARMC8alpha and ARMC8beta as components. In RanBPM, Muskelin, p48EMLP, and p44CTLH we found LisH/CTLH motifs, which are present in proteins involved in microtubule dynamics, cell migration, nucleokinesis, and chromosome segregation. We renamed the 20S large protein complex the CTLH complex. The N-terminal 364 amino acids of ARMC8alpha and ARMC8beta were completely conserved, suggesting that these proteins are probably alternatively spliced products from the same gene. We confirmed the in vivo association of each component by co-immunoprecipitation assays with Cos-7 cells in which these components were exogenously overexpressed. A pull-down assay with bacterially-expressed Twa1 revealed binding of each in vitro-translated component to Twa1. Finally, we confirmed the cellular localization of these proteins. Taken together, our results reveal that RanBPM, ARMC8alpha, ARMC8beta, Muskelin, p48EMLP, and p44CTLH form complexes in cells.
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Affiliation(s)
- Nobuaki Kobayashi
- Department of Internal Medicine and Clinical Immunology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama-City 236-0004, Japan
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17
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Isono K, Nemoto K, Li Y, Takada Y, Suzuki R, Katsuki M, Nakagawara A, Koseki H. Overlapping roles for homeodomain-interacting protein kinases hipk1 and hipk2 in the mediation of cell growth in response to morphogenetic and genotoxic signals. Mol Cell Biol 2006; 26:2758-71. [PMID: 16537918 PMCID: PMC1430338 DOI: 10.1128/mcb.26.7.2758-2771.2006] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Homeodomain-interacting protein kinase 1 (Hipk1), 2, and 3 genes encode evolutionarily conserved nuclear serine/threonine kinases, which were originally identified as interacting with homeodomain-containing proteins. Hipks have been repeatedly identified as interactors for a vast range of functional proteins, including not only transcriptional regulators and chromatin modifiers but also cytoplasmic signal transducers, transmembrane proteins, and the E2 component of SUMO ligase. Gain-of-function experiments using cultured cells indicate growth regulatory roles for Hipks on receipt of morphogenetic and genotoxic signals. However, Hipk1 and Hipk2 singly deficient mice were grossly normal, and this is expected to be due to a functional redundancy between Hipk1 and Hipk2. Therefore, we addressed the physiological roles of Hipk family proteins by using Hipk1 Hipk2 double mutants. Hipk1 Hipk2 double homozygotes are progressively lost between 9.5 and 12.5 days postcoitus and frequently fail to close the anterior neuropore and exhibit exencephaly. This is most likely due to defective proliferation in the neural fold and underlying paraxial mesoderm, particularly in the ventral region, which may be attributed to decreased responsiveness to Sonic hedgehog signals. The present study indicated the overlapping roles for Hipk1 and Hipk2 in mediating cell proliferation and apoptosis in response to morphogenetic and genotoxic signals during mouse development.
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Affiliation(s)
- Kyoichi Isono
- RIKEN Research Center for Allergy and Immunology, 1-7-22 Suehiro, Tsurumi-ku, Yokohama 230-0045, Japan
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18
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Johnson SE, Winner DG, Wang X. Ran binding protein 9 interacts with Raf kinase but does not contribute to downstream ERK1/2 activation in skeletal myoblasts. Biochem Biophys Res Commun 2006; 340:409-16. [PMID: 16364241 DOI: 10.1016/j.bbrc.2005.12.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2005] [Accepted: 12/06/2005] [Indexed: 10/25/2022]
Abstract
Raf kinase is the upstream activator of MEK1/2 leading to phosphorylation and activation of ERK1/2. Sustained activation of Raf represses skeletal muscle-specific reporter gene transcription and formation of multinucleated myofibers. Inhibition of myogenesis by activated Raf involves downstream ERK1/2 as well as undefined mediators. To identify Raf-interacting proteins that may influence repression of muscle formation, a yeast two-hybrid screen was performed using a MEK1-binding defective Raf (RafBXB-T481A) as bait. Twenty cDNAs coding for Raf-interacting proteins were identified including Ran binding protein 9 (RanBP9), a protein previously reported to interact with receptor tyrosine kinases. Forced expression of RanBP9 in myogenic cells did not alter myogenesis. Co-expression of RanBP9 with constitutively active RafBXB, but not RafBXB-T481A, synergistically inhibited MyoD-directed muscle reporter gene transcription. Knockdown of RanBP9 expression did not restore the differentiation program to Raf-expressing myoblasts. Thus, RanBP9 physically associates with Raf but does not substantially contribute to the inhibitory actions of the kinase.
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Hafizi S, Gustafsson A, Stenhoff J, Dahlbäck B. The Ran binding protein RanBPM interacts with Axl and Sky receptor tyrosine kinases. Int J Biochem Cell Biol 2005; 37:2344-56. [PMID: 15964779 DOI: 10.1016/j.biocel.2005.05.006] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2005] [Indexed: 12/14/2022]
Abstract
Axl belongs to a particular subfamily of transmembrane receptor tyrosine kinases, the biological ligand for which is the growth/survival factor Gas6. However, little is known about the molecular mechanisms for Axl activation and signal transduction. We have previously identified a novel interaction between the intracellular domain of Axl and Ran binding protein in microtubule organising centre (RanBPM). In the present study, we investigated further the nature of the RanBPM interaction with Axl. A wide distribution of RanBPM mRNA expression in human tissues and various human cancer cell lines was detected. The strength of interaction of both proteins in yeast was comparable to that with the other Axl-binding proteins phosphatidylinositol 3-kinase and Grb2. A truncated version of RanBPM with the SPRY-LisH domain region omitted failed to interact with Axl in yeast. RanBPM was also found to interact in yeast with the Axl homologue, Sky/Tyro3. The interaction between Axl intracellular domain and RanBPM was reproduced in coimmunoprecipitation experiments in both cell-free and mammalian cell systems. Furthermore, coimmunoprecipitation revealed endogenous Axl and RanBPM to interact in several mammalian cell lines in a constitutive manner. Stimulation of COS cells with Gas6 caused increased Axl tyrosine phosphorylation although appeared not to influence the RanBPM-Axl association. In conclusion, we have identified and characterised a novel interaction between RanBPM and the related receptor tyrosine kinases, Axl and Sky. This novel insight into the signalling interactions of Axl and Sky may shed further light on their suspected roles in tumourigenesis, inflammation as well as other cell proliferative diseases.
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Affiliation(s)
- Sassan Hafizi
- Department of Laboratory Medicine, Section for Clinical Chemistry, Lund University, Wallenberg Laboratory, University Hospital Malmö, SE-205 02 Malmö, Sweden.
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20
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Kramer S, Ozaki T, Miyazaki K, Kato C, Hanamoto T, Nakagawara A. Protein stability and function of p73 are modulated by a physical interaction with RanBPM in mammalian cultured cells. Oncogene 2005; 24:938-44. [PMID: 15558019 DOI: 10.1038/sj.onc.1208257] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Upon a certain DNA damage including cisplatin treatment, p73 is stabilized and exerts its growth-suppressive and/or proapoptotic function. However, the precise molecular basis by which the intracellular levels of p73 are regulated remains unclear. In the present study, we have identified RanBPM as a novel binding partner of p73alpha by yeast-based two-hybrid screening, and also found that RanBPM has an ability to stabilize p73alpha. GST pull-down assays and co-immunoprecipitation experiments revealed that RanBPM directly bound to the extreme COOH-terminal region of p73alpha, whereas it failed to interact with p53. Co-expression of RanBPM with p73alpha resulted in the nuclear translocation of RanBPM, and both proteins co-localized in cell nucleus as examined by indirect immunofluorescent staining. It is worth noting that the expression of RanBPM inhibited the ubiquitination of p73alpha, and thereby prolonged its half-life. Subsequent studies demonstrated that the proapoptotic activity of p73alpha was significantly enhanced in the presence of RanBPM. Taken together, our present findings implicate a novel role for RanBPM in the regulation of p73 stability and function.
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Affiliation(s)
- Sonja Kramer
- Division of Biochemistry, Chiba Cancer Center Research Institute, 666-2 Nitona, Chuoh-ku, Chiba 260-8717, Japan
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21
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Radisavljevic ZM, González-Flecha B. TOR kinase and Ran are downstream from PI3K/Akt in H2O2-induced mitosis. J Cell Biochem 2004; 91:1293-300. [PMID: 15048882 DOI: 10.1002/jcb.20037] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Hydrogen peroxide (H2O2) activates signaling cascades essential for cell proliferation via phosphatidylinositol-3-kinase (PI3K) and Akt. Here we show that induction of mitogenic signaling by H2O2 activates sequentially PI3K, Akt, mammalian target of rapamycin (mTOR), and Ran protein. Akt activation is followed by signaling through the mTOR kinase and upregulation of Ran in primary type II pneumocytes, a cell type implicated in the development of lung adenocarcinoma. Pretreatment of the cells with wortmannin, a specific inhibitor of PI3K, or rapamycin, a specific inhibitor of mTOR kinase, prevented H2O2-increased mitosis. H2O2-induced Akt ser-473 phosphorylation and upregulation of Ran protein were prevented by wortmannin but not by rapamycin, indicating that PI3K is upstream of Akt and mTOR is downstream from Akt. Overexpression of myr-Akt or Ran-wt in type II pneumocytes increased Akt ser-473 phosphorylation and mitosis in a catalase-dependent manner, indicating that H2O2 is essential for Akt and Ran signaling. These results indicate that H2O2-induced mitogenic signaling in primary type II pneumocytes is mediated by PI3K, Akt, mTOR-kinase, and Ran protein.
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22
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Vanholme B, De Meutter J, Tytgat T, Van Montagu M, Coomans A, Gheysen G. Secretions of plant-parasitic nematodes: a molecular update. Gene 2004; 332:13-27. [PMID: 15145050 DOI: 10.1016/j.gene.2004.02.024] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2003] [Revised: 01/30/2004] [Accepted: 02/09/2004] [Indexed: 11/23/2022]
Abstract
The interaction between sedentary endoparasitic nematodes and plants is fascinating, because these animals have developed an ingenious way to manipulate the plant's gene regulation and metabolism to their own advantage. They are able to form highly specialized feeding structures in the plant root to satisfy their nutritional demands for development and reproduction. This ability makes them extremely successful parasites with severe consequences for agriculture. Triggered by these economical losses, detailed studies of the parasitic interaction have been performed, which resulted in an extensive descriptive knowledge. However, the underlying biochemical and molecular events of this intimate relationship have still not been elucidated. It is generally accepted that secretions produced by the nematode are responsible for the dramatic alteration of specific cells in the host plant. In the past few years, the identification of genes coding for secreted proteins was a breakthrough in plant nematode research. However, the available information is still too limited to allow the formulation of a comprehensive model, mainly because the sequences of many of these genes are novel with no similar sequence found in the existing databases. A new challenge in the coming years will be the functional analysis of these putative parasitism genes.
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Affiliation(s)
- Bartel Vanholme
- Molecular Biotechnology Department, Faculty of Agricultural and Applied Biological Sciences, Ghent University, Coupure links 653, B-9000 Ghent, Belgium
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23
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Tang X, Zhang J, Cai Y, Miao S, Zong S, Koide SS, Wang L. Sperm membrane protein (hSMP-1) and RanBPM complex in the microtubule-organizing centre. J Mol Med (Berl) 2004; 82:383-8. [PMID: 15014887 DOI: 10.1007/s00109-004-0535-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2003] [Accepted: 02/11/2004] [Indexed: 10/26/2022]
Abstract
hSMP-1 is a human sperm membrane protein expressed during development. It is a testis-specific component produced during male germ cell differentiation. Proteins that interact with hSMP-1 were identified by the application of the yeast two-hybrid system. One of the components, RanBPM, was found to be associated with hSMP-1 under both in vitro and in vivo conditions. In the human testis, RanBPM is produced in spermatogonia and primary spermatocytes, suggesting expression during the early stages of spermatogenesis; whereas in the rat testis, it is located in round and elongated spermatids, similar to hSMP-1, suggesting expression of both components during spermiogenesis. Images obtained by immunofluorescence and confocal scanning microscopy of CHO-K1 cells co-transfected with pEGFP-C1-hSMP-1 and pDsRed1-Nl-RanBPM revealed that RanBPM and hSMP-1 are distributed in discrete loci throughout the cytoplasm. When superimposed, the stained spots appeared as congruent yellow areas, indicative of co-localization and probable complex formation of these two components. This interaction between hSMP-1 and RanBPM may be involved in the process of male germ cell differentiation. In CHO-Kl cells transfected with pEGFP-Cl-hSMP-1, the exogenously expressed hSMP-1 was found to co-localize with alpha-tubulin. Depolymerization of microtubules can be induced in CHO-Kl cells by cold treatment. In cells transfected with the pEGFP-Cl vector, the dispersed tubulins promptly reassembled upon warming. However, in cells transfected with pEGFP-Cl-hSMP-1, reassembly of the dispersed tubulins was blocked even upon rewarming of the cells. These findings suggest that hSMP-1 interacts with tubulins and thereby may modulate microtubule assembly and/or activity.
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Affiliation(s)
- Xiaoling Tang
- National Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Peking Union Medical College, 5 Dong Dan San Tiao, 100005 Beijing, China
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24
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Wang D, Li Z, Schoen SR, Messing EM, Wu G. A novel MET-interacting protein shares high sequence similarity with RanBPM, but fails to stimulate MET-induced Ras/Erk signaling. Biochem Biophys Res Commun 2004; 313:320-6. [PMID: 14684163 DOI: 10.1016/j.bbrc.2003.11.124] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
MET is a receptor protein tyrosine kinase for hepatocyte growth factor, a multifunctional cytokine controlling cell growth, morphogenesis, and motility. In our previous study, RanBPM/RanBP9, whose name originated from its ability to interact with Ran, was identified as a MET-interacting protein. RanBPM/RanBP9 activates the Ras/Erk signaling pathway by serving as an adaptor protein of MET to recruit Sos. In this study, we identify a protein sharing a high amino acid sequence identity with RanBPM/RanBP9, especially in its SPRY domain, the region responsible for MET binding. This protein lacks the N-terminal poly-proline and poly-glutamine (Poly-PQ) stretch present in RanBPM/RanBP9 and has less homology with RanBPM/RanBP9 in its mid-region. We subsequently named this protein RanBP10 after demonstrating its interaction with Ran. We show that, like RanBPM/RanBP9, RanBP10 interacts with the tyrosine kinase domain of MET via its SPRY domain and these two proteins can compete with each other to bind to MET. Interestingly, unlike RanBPM/RanBP9, overexpression of RanBP10 cannot induce Erk1/2 phosphorylation and serum response element-luciferase (SRE-LUC) reporter gene expression. More importantly, co-transfection of RanBPM/RanBP9 and RanBP10 significantly represses SRE-LUC reporter gene expression induced by overexpression of RanBPM/RanBP9. Additional binding assays demonstrate that RanBP10 fails to interact with Sos, which explains its inability to activate the Ras/Erk pathway. Furthermore, we show that the N-terminus of RanBPM/RanBP9 with the Poly-PQ stretch is required for recruiting Sos and a truncated RanBPM/RanBP9 lacking this region fails to recruit Sos, indicating that the functional difference between RanBP10 and RanBPM/RanBP9 lies in their sequence difference in their N-termini.
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Affiliation(s)
- Dakun Wang
- Department of Urology, University of Rochester Medical Center, Rochester, NY 14642, USA
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25
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Zou Y, Lim S, Lee K, Deng X, Friedman E. Serine/threonine kinase Mirk/Dyrk1B is an inhibitor of epithelial cell migration and is negatively regulated by the Met adaptor Ran-binding protein M. J Biol Chem 2003; 278:49573-81. [PMID: 14500717 DOI: 10.1074/jbc.m307556200] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Minibrain-related kinase (Mirk)/Dyrk1B is an arginine-directed serine/threonine kinase that is active in skeletal muscle development but is also expressed in various carcinomas. In the current study, the Met adaptor protein Ran-binding protein M (RanBPM) was identified as a Mirk-binding protein by yeast two-hybrid analysis. The Mirk-RanBPM association was confirmed by glutathione S-transferase pull-down assays, co-immunoprecipitation studies, and in vivo cross-linking. Met plays an important role in tumor cell invasion and cell migration. RanBPM has been reported to bind to the tyrosine kinase domain of the hepatocyte growth factor (HGF) receptor Met, enhance Met downstream signaling, and enhance HGF-induced A704 kidney carcinoma cell invasion (Wang, D., Li, Z., Messing, E. M., and Wu, G. (2002) J. Biol. Chem. 277, 36216-36222). We made a stable Mirk-inducible subline from nontransformed Mv1Lu lung epithelial cells and now demonstrate that induction of Mirk inhibited the migration of these cells in wounding experiments and inhibited their invasion through polycarbonate Transwell filters. Furthermore the ability of Mirk to inhibit Mv1Lu cell migration was attenuated when cells were exposed to HGF or to elevated levels of transiently expressed RanBPM. RanBPM inhibited the kinase activity of Mirk/Dyrk1B and Dyrk1A. In addition, RanBPM and HGF inhibited the function of Mirk as a transcriptional coactivator. Our findings suggest that Mirk plays a role in modulating cell migration through opposing the action of the Met signaling cascade adaptor protein RanBPM.
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Affiliation(s)
- Yonglong Zou
- Pathology Department, Upstate Medical University, Syracuse, New York 13210, USA
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26
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Mikolajczyk M, Shi J, Vaillancourt RR, Sachs NA, Nelson M. The cyclin-dependent kinase 11p46 isoform interacts with RanBPM. Biochem Biophys Res Commun 2003; 310:14-8. [PMID: 14511641 DOI: 10.1016/j.bbrc.2003.08.116] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We identified Ran-binding protein (RanBPM) as an interacting partner of the caspase-processed C-terminal domain of cyclin-dependent kinase 11 (CDK11(p46)) by using the yeast two-hybrid system. CDK11(p110) protein kinases are members of the cyclin-dependent kinase superfamily. During staurosporine-, Fas-, and tumor necrosis factor alpha-induced apoptosis caspase-processed activated CDK11(p46) is generated from larger CDK11(p110) isoforms. CDK11(p46) promotes apoptosis when it is ectopically expressed in human cells. However, the mechanism of signal transduction through CDK11(p46) is still unclear. In this study, we demonstrate that CDK11(p46) directly interacts with RanBPM in vitro and in human cells. RanBPM contains a conserved SPRY (repeats in splA and Ryr) domain and is localized both in the nucleus and cytoplasm. The SPRY domain of RanBPM is responsible for the association between CDK11(p46) and RanBPM. Furthermore, we show that CDK11(46) phosphorylates RanBPM.
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Affiliation(s)
- Monika Mikolajczyk
- Department of Pathology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA
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27
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Abstract
The neurotrophin receptor p75NTR can induce signal transduction both in vivo and in vitro. The mechanisms by which p75NTR transduces signals have remained mostly unknown. Using yeast two-hybrid system, we identified the Ran-binding protein (RanBPM) as an interactor with the intracytoplasmic domain of p75NTR (p75ICD). The interaction was then validated by immunoprecipitation in mammalian cells and immunoblotting analysis. The domain in p75ICD interacting with RanBPM was mapped to the death domain.
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Affiliation(s)
- Dong Bai
- National Laboratory of Medical Molecular Biology, Department of Biochemistry and Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100005, China
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28
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Lutz W, Frank EM, Craig TA, Thompson R, Venters RA, Kojetin D, Cavanagh J, Kumar R. Calbindin D28K interacts with Ran-binding protein M: identification of interacting domains by NMR spectroscopy. Biochem Biophys Res Commun 2003; 303:1186-92. [PMID: 12684061 DOI: 10.1016/s0006-291x(03)00499-6] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Calbindin D(28K) is an EF-hand containing protein that plays a vital role in neurological function. We now show that calcium-loaded calbindin D(28K) interacts with Ran-binding protein M, a protein known to play a role in microtubule function. Using NMR methods, we show that a peptide, LASIKNR, derived from Ran-binding protein M, interacts with several regions of the calcium-loaded protein including the amino terminus and two other regions that exhibit conformational exchange on the NMR timescale. We suggest that the interaction between calbindin D(28K) and Ran-binding protein M may be important in calbindin D(28K) function.
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Affiliation(s)
- Ward Lutz
- Department of Biochemistry, Research Center, Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN 55905, USA
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29
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Umeda M, Nishitani H, Nishimoto T. A novel nuclear protein, Twa1, and Muskelin comprise a complex with RanBPM. Gene 2003; 303:47-54. [PMID: 12559565 DOI: 10.1016/s0378-1119(02)01153-8] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A truncated human RanBPM has been isolated as a protein binding to Ran, Ras-like nuclear small GTPase. Full-sized human RanBPM cDNA which was recently isolated, was found to encode a protein of 90 kDa which comprises a large protein complex. Consistent with this finding, several proteins were found to be co-precipitated with RanBPM by immunoprecipitation analysis. Accordingly, in the present study, we screened the human cDNA library by the two-hybrid method using RanBPM cDNA as bait. One novel protein designated as Twa1 (Two hybrid associated protein No. 1 with RanBPM), and two known proteins, a human homologue (hMuskelin) of mouse Muskelin and HSMpp8 were isolated repeatedly. Twa1 was well conserved through evolution and was localized within the nucleus. Interestingly, in addition to Muskelin and RanBPM, Twa1 was found to possess the LisH-CTLH motif which is detected in proteins involved in microtubule dynamics, cell migration, nucleokinesis and chromosome segregation. These functions overlap with functions suggested for the RanGTPase cycle. Immunoprecipitation and gel-filtration analyses indicated that both Twa1 and hMuskelin did indeed comprise a protein complex with RanBPM. Taken together with the fact that RanBPM interacts with Ran, our present findings suggested that there is an as yet uncovered function of the RanGTPase cycle.
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Affiliation(s)
- M Umeda
- Department of Molecular Biology, Graduate School of Medical Science, Kyushu University, Fukuoka 812-8582, Japan
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