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Liu M, Zhao J, Lu Y, Chen Z, Feng X, Pan G. Gab1 Overexpression Attenuates Susceptibility to Ventricular Arrhythmias in Pressure Overloaded Heart Failure Mouse Hearts. Cardiovasc Drugs Ther 2024; 38:253-262. [PMID: 36374360 DOI: 10.1007/s10557-022-07394-0] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 10/14/2022] [Indexed: 11/16/2022]
Abstract
PURPOSE Grb2 associated binding protein 1 (Gab1) is an adaptor protein that is important for intracellular signal transduction which involved in several pathological process. However, the role of Gab1 in pressure overload-induced ventricular arrhythmias (VAs) remain poorly understood. In the current study, we aimed to test the role of Gab1 in VA susceptibility induced by pressure overload. METHODS We overexpressed Gab1 in the hearts using an adeno-associated virus 9 (AAV9) system through tail vein injection. Aortic banding (AB) surgery was performed in C57BL6/J mice to induce heart failure (HF). Four weeks following AB, histology, echocardiography, and biochemical analysis were conducted to investigate cardiac structural remodeling and electrophysiological studies were performed to check the electrical remodeling. Western blot analysis was used to explore the underlying mechanisms. RESULTS The mRNA and protein expression were downregulated in AB hearts compared to sham hearts. Gab1 overexpression significantly reversed AB-induced cardiac structural remodeling including ameliorated AB-induced cardiac dysfunction, cardiac fibrosis, and inflammatory response. Moreover, Gab1 overexpression also markedly alleviated AB-induced electrical remodeling including ion channel alterations and VA susceptibility. Mechanistically, we found that TLR4/MyD88/NF-κB contributes to the cardio protective effect of Gab1 overexpression on AB-induced VAs. CONCLUSIONS Our study manifested that Gab1 may serve as a promising anti-arrhythmic target via inhibiting TLR4/MyD88/NF-κB signaling pathway induced by AB.
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Affiliation(s)
- Mingxin Liu
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China.
| | - Jianhua Zhao
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China
| | - Yonghua Lu
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China
| | - Zhi Chen
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China
| | - Xiaojian Feng
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China
| | - Gang Pan
- Department of Cardiology, Yueyang Central Hospital, No.39 Dongmaoling Road, Yueyang 414000, Hunan, China.
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2
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Bongartz H, Mehwald N, Seiß EA, Schumertl T, Naß N, Dittrich A. Dysregulated Gab1 signalling in triple negative breast cancer. Cell Commun Signal 2024; 22:161. [PMID: 38448989 PMCID: PMC10916281 DOI: 10.1186/s12964-024-01542-9] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 02/24/2024] [Indexed: 03/08/2024] Open
Abstract
BACKGROUND Breast cancer is the most common cancer in women worldwide. Triple-negative breast cancer (TNBC) is especially aggressive and associated with high metastasis. The aetiology of TNBC is heterogeneous and characterised by multiple different mutations that amongst others cause constitutive and dysregulated MAPK and PI3K signalling. Additionally, in more than 50% of TNBC patients, the epidermal growth factor receptor (EGFR) is overexpressed and constitutively active. The multi-site docking protein Grb2-associated binder 1 (Gab1) is a central signalling hub that connects MAPK and PI3K signalling. METHODS Expression and activation of members of the Gab1/PI3K/MAPK signalling network were assessed in cells from different breast cancer subtypes. Influence of short- and long-term inhibition of EGFR, MAPK and PI3K on the activation of the Gab1/PI3K/MAPK signalling network as well as on cell viability, proliferation and migration was determined. Additionally, cellular localisation of Gab1 and Gab1 variants in naive cells and cells treated with the above-mentioned inhibitors was investigated. RESULTS We show that, activation of the Gab1/PI3K/MAPK signalling network is heterogeneous between different breast cancer subtypes. Gab1 phosphorylation and plasma membrane recruitment of Gab1 are dysregulated in the EGFRhigh TNBC cell line MDA-MB-468. While the Gab1/MAPK/PI3K signalling network follows canonical Gab1 signalling in naive MDA-MB-468 cells, Gab1 signalling is changed in cells that acquired resistance towards MAPK and PI3K inhibition. In resistant cells, Gab1 is not located at the plasma membrane despite strong activation of PI3K and MAPK. Furthermore, Gab1 tyrosine phosphorylation is uncoupled from plasma membrane recruitment. CONCLUSION Our study indicates that Gab1 signalling changes fundamentally during the acquisition of resistance to pharmacological inhibitors. Given the molecular heterogeneity between breast cancer subtypes, the detailed understanding of dysregulated and aberrant signalling is an absolute necessity in order to develop personalised therapies for patients with TNBC.
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Affiliation(s)
- Hannes Bongartz
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany
- Present address: Laboratory of Immune System Biology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 9000 Rockville Pike, Bethesda, MD, 20892, USA
| | - Nora Mehwald
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany
| | - Elena A Seiß
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany
| | - Tim Schumertl
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany
- Present address: Institute of Clinical Biochemistry, Hannover Medical School, Carl-Neuberg-Straße 1, Hannover, 30625, Germany
| | - Norbert Naß
- Department of Pathology, Brandenburg Medical School Theodor Fontane, University Hospital Brandenburg / Havel, Hochstraße 29, Brandenburg, 14770, Germany
| | - Anna Dittrich
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany.
- Center for Dynamic Systems: Systems Engineering (CDS), Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany.
- Magdeburg Center for Systems Biology (MACS), Otto-von-Guericke University, Universitätsplatz 2, Magdeburg, 39106, Germany.
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3
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Li T, Tian Y, Ren W, Chen P, Luo M, Sang H. Gab1 regulates invadopodia and autocrine VEGF through SHP2/ERK1/2 in hilar cholangiocarcinoma cells. Am J Transl Res 2022; 14:8934-8946. [PMID: 36628230 PMCID: PMC9827304] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Accepted: 12/03/2022] [Indexed: 01/12/2023]
Abstract
OBJECTIVES Hilar cholangiocarcinoma is the most common malignant tumors of the biliary tract and it has high invasiveness. Invadopodia and autocrine vascular endothelial growth factor (VEGF) are closely related to tumor invasiveness. We investigated the role of Grb2-associated binder 1 (Gab1) in invadopodia and autocrine VEGF in hilar cholangiocarcinoma cells. METHODS The expression of Gab1 and vascular endothelial growth factor receptor 2 (VEGFR-2) in tumor cells was detected by real-time PCR. MTT, flow cytometry and transwell assays were used to determine the effect of Gab1 on the biological behavior of tumor cells. In situ gelatin zymogram, western blotting, ELISA and immunofluorescence were used to study Gab1- and apatinib-regulated invadopodia, epithelial-mesenchymal transition (EMT), and VEGF autocrine signaling through the SHP2/ERK1/2 pathway. RESULTS Gab1 controlled invadopodia maturation via the regulation of cortactin and EMT. Additionally, Gab1-regulated autocrine VEGF was observed in tumor cells expressing VEGFR-2, and endogenous and exogenous VEGF regulated VEGF expression through p-VEGFR-2 nuclear aggregation. Furthermore, the Gab1/SHP2/ERK1/2 axis regulated invadopodia and VEGF autocrine function in tumor cells. Finally, apatinib inhibited the malignant behavior of tumor cells and the nuclear aggregation of p-VEGFR-2 by inhibiting the phosphorylation of VEGFR-2 (direct) and the expression of Gab1 (indirect) in tumor cells. CONCLUSIONS This study demonstrates that Gab1 and apatinib affect tumor cell invadopodia and autocrine VEGF expression through the Gab1/SHP2/ERK1/2 axis in hilar cholangiocarcinoma cells.
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Affiliation(s)
- Tingting Li
- Department of Clinical Genetics, Shengjing Hospital of China Medical UniversityShenyang 110004, Liaoning, P. R. China
| | - Ye Tian
- Department of Thoracic Surgery, The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032, Liaoning, P. R. China
| | - Weiqiang Ren
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032, Liaoning, P. R. China
| | - Peng Chen
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032, Liaoning, P. R. China
| | - Mingxiao Luo
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032, Liaoning, P. R. China
| | - Haiquan Sang
- Department of General Surgery, The Fourth Affiliated Hospital of China Medical UniversityShenyang 110032, Liaoning, P. R. China
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Abstract
Src homology 2-containing protein tyrosine phosphatase 2 (SHP2) is a non-receptor protein tyrosine phosphatase ubiquitously expressed mainly in the cytoplasm of several tissues. SHP2 modulates diverse cell signaling events that control metabolism, cell growth, differentiation, cell migration, transcription and oncogenic transformation. It interacts with diverse molecules in the cell, and regulates key signaling events including RAS/ERK, PI3K/AKT, JAK/STAT and PD-1 pathways downstream of several receptor tyrosine kinases (RTKs) upon stimulation by growth factors and cytokines. SHP2 acts as both a phosphatase and a scaffold, and plays prominently oncogenic functions but can be tumor suppressor in a context-dependent manner. It typically acts as a positive regulator of RTKs signaling with some inhibitory functions reported as well. SHP2 expression and activity is regulated by such factors as allosteric autoinhibition, microRNAs, ubiquitination and SUMOylation. Dysregulation of SHP2 expression or activity causes many developmental diseases, and hematological and solid tumors. Moreover, upregulated SHP2 expression or activity also decreases sensitivity of cancer cells to anticancer drugs. SHP2 is now considered as a compelling anticancer drug target and several classes of SHP2 inhibitors with different mode of action are developed with some already in clinical trial phases. Moreover, novel SHP2 substrates and functions are rapidly growing both in cell and cancer. In view of this, we comprehensively and thoroughly reviewed literatures about SHP2 regulatory mechanisms, substrates and binding partners, biological functions, roles in human cancers, and different classes of small molecule inhibitors target this oncoprotein in cancer.
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Affiliation(s)
- Moges Dessale Asmamaw
- Department of Pharmacology, School of Basic Medical Sciences, State Key Laboratory for Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, Henan Province, 450001, People's Republic of China
| | - Xiao-Jing Shi
- Academy of Medical Sciences, Zhengzhou University, Zhengzhou, Henan Province, 450052, People's Republic of China
| | - Li-Rong Zhang
- Department of Pharmacology, School of Basic Medical Sciences, State Key Laboratory for Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, Henan Province, 450001, People's Republic of China.
| | - Hong-Min Liu
- School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, Henan Province, China. .,Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education of China, Zhengzhou, Henan Province, 450001, People's Republic of China.
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Qian X, Wang H, Wang Y, Chen J, Guo X, Deng H. Enhanced Autophagy in GAB1-Deficient Vascular Endothelial Cells Is Responsible for Atherosclerosis Progression. Front Physiol 2021; 11:559396. [PMID: 33584322 PMCID: PMC7877249 DOI: 10.3389/fphys.2020.559396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 12/28/2020] [Indexed: 12/28/2022] Open
Abstract
Autophagy is a host machinery that controls cellular health. Dysfunction of autophagy is responsible for the pathogenesis of many human diseases that include atherosclerosis obliterans (ASO). Physiologically, host autophagy removes aging organelles and delays the formation of atherosclerotic plaque. However, in ischemia event, dysregulated autophagy can be induced to trigger autosis, leading to an inevitable cellular death. Grb2-associated binder 1 (GAB1) is a docking/scaffolding adaptor protein that regulates many cell processes including autophagy. Our study first reported that the protein expression of GAB1 significantly decreased in ASO. Mechanically, our results showed that inhibition of Akt (protein kinase B), the upstream of mTOR (mechanistic target of rapamycin), significantly enhanced autophagy by demonstrating the downregulation of p62/Sequestosome 1 expression and the upregulation of the ratio of LC3II/LC3I. Conversely, we found that the inhibition of ERK1/2 (extracellular signal-regulated kinases1/2), p38, and JNK (c-Jun N-terminal kinase) signaling pathway, respectively, significantly inhibited autophagy by demonstrating the upregulation of p62 expression and the downregulation of the ratio of LC3II/LC3I. Further, we demonstrated that knockdown of GAB1 significantly increased autophagy in HUVECs (human umbilical vein endothelial cells) via activation of MAPK (mitogen-activated protein kinase) pathways that include ERK1/2, p38, and JNK. Moreover, we found that knockdown of GAB1 profoundly inhibited HUVEC proliferation, migration, and tube formation. Taken together, this study first suggests that GAB1 is a key regulator of autophagy in HUVECs. Targeting GAB1 may serve as a potential strategy for the atherosclerosis treatment.
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Affiliation(s)
- Xin Qian
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Han Wang
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Yuli Wang
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Jiaquan Chen
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Xiangjiang Guo
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Haoyu Deng
- Department of Vascular Surgery, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
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Zhou L, Shao CY, Xie YJ, Wang N, Xu SM, Luo BY, Wu ZY, Ke YH, Qiu M, Shen Y. Gab1 mediates PDGF signaling and is essential to oligodendrocyte differentiation and CNS myelination. eLife 2020; 9:52056. [PMID: 31944179 PMCID: PMC6984811 DOI: 10.7554/elife.52056] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 01/14/2020] [Indexed: 02/06/2023] Open
Abstract
Oligodendrocytes (OLs) myelinate axons and provide electrical insulation and trophic support for neurons in the central nervous system (CNS). Platelet-derived growth factor (PDGF) is critical for steady-state number and differentiation of oligodendrocyte precursor cells (OPCs), but its downstream targets are unclear. Here, we show for the first time that Gab1, an adaptor protein of receptor tyrosine kinase, is specifically expressed in OL lineage cells and is an essential effector of PDGF signaling in OPCs in mice. Gab1 is downregulated by PDGF stimulation and upregulated during OPC differentiation. Conditional deletions of Gab1 in OLs cause CNS hypomyelination by affecting OPC differentiation. Moreover, Gab1 binds to downstream GSK3β and regulated its activity, and thereby affects the nuclear accumulation of β-catenin and the expression of a number of transcription factors critical to myelination. Our work uncovers a novel downstream target of PDGF signaling, which is essential to OPC differentiation and CNS myelination.
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Affiliation(s)
- Liang Zhou
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China.,Key Laboratory of Brain Science, Guizhou Institution of Higher Education, Zunyi Medical University, Zunyi, China
| | - Chong-Yu Shao
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Ya-Jun Xie
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Na Wang
- School of Medicine, Zhejiang University City College, Hangzhou, China
| | - Si-Min Xu
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Ben-Yan Luo
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Zhi-Ying Wu
- Department of Neurology and Research Center of Neurology in Second Affiliated Hospital, Key Laboratory of Medical Neurobiology of Zhejiang Province, Zhejiang University School of Medicine, Hangzhou, China
| | - Yue Hai Ke
- Department of Pathology and Pathophysiology, Zhejiang University School of Medicine, Hangzhou, China
| | - Mengsheng Qiu
- Institute of Life Sciences, Zhejiang Key Laboratory of Organ Development and Regeneration, College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, China
| | - Ying Shen
- Department of Physiology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,Department of Neurology of First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.,NHC and CAMS Key Laboratory of Medical Neurobiology, Zhejiang University School of Medicine, Hangzhou, China
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Bongartz H, Gille K, Hessenkemper W, Mandel K, Lewitzky M, Feller SM, Schaper F. The multi-site docking protein Grb2-associated binder 1 ( Gab1) enhances interleukin-6-induced MAPK-pathway activation in an SHP2-, Grb2-, and time-dependent manner. Cell Commun Signal 2019; 17:135. [PMID: 31651330 PMCID: PMC6814103 DOI: 10.1186/s12964-019-0451-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2019] [Accepted: 10/04/2019] [Indexed: 12/13/2022] Open
Abstract
Background Cytokine-dependent activation of signalling pathways is tightly orchestrated. The spatiotemporal activation of signalling pathways dictates the specific physiological responses to cytokines. Dysregulated signalling accounts for neoplastic, developmental, and inflammatory diseases. Grb2-associated binder (Gab) family proteins are multi-site docking proteins, which expand cytokine-induced signal transduction in a spatial- and time-dependent manner by coordinating the recruitment of proteins involved in mitogen activated protein kinase (MAPK)/extracellular-signal regulated kinase (ERK) and phosphatidyl-inositol-3-kinase (PI3K) signalling. Interaction of Gab family proteins with these signalling proteins determines strength, duration and localization of active signalling cascades. However, the underlying molecular mechanisms of signal orchestration by Gab family proteins in IL-6-induced signalling are only scarcely understood. Methods We performed kinetic analyses of interleukin-6 (IL-6)-induced MAPK activation and analysed downstream responses. We compared signalling in wild-type cells, Gab1 knock-out cells, those reconstituted to express Gab1 mutants, and cells expressing gp130 receptors or receptor mutants. Results Interleukin-6-induced MAPK pathway activation can be sub-divided into an early Gab1-independent and a subsequent Gab1-dependent phase. Early Gab1-independent MAPK activation is critical for the subsequent initiation of Gab1-dependent amplification of MAPK pathway activation and requires binding of SH2 domain-containing phosphatase 2 (SHP2) to the interleukin-6 receptor complex. Subsequent and coordinated recruitment of Grb2 and SHP2 to Gab1 is essential for Gab1-dependent amplification of IL-6-induced late MAPK pathway activation and subsequent gene expression. Conclusions Overall, we elaborated the molecular requirements for Gab1-dependent, spatiotemporal orchestration of interleukin-6-dependent MAPK signalling. We discriminated IL-6-induced Gab1-independent, early activation of MAPK signalling and Gab1-dependent, sustained activation of MAPK signalling.
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Affiliation(s)
- Hannes Bongartz
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Gebäude 28/Pfälzer Platz, 39106, Magdeburg, Germany
| | - Karen Gille
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Gebäude 28/Pfälzer Platz, 39106, Magdeburg, Germany
| | - Wiebke Hessenkemper
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Gebäude 28/Pfälzer Platz, 39106, Magdeburg, Germany
| | - Katharina Mandel
- Institute of Molecular Medicine, Charles Tanford Protein Research Center, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120, Halle (Saale), Germany
| | - Marc Lewitzky
- Institute of Molecular Medicine, Charles Tanford Protein Research Center, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120, Halle (Saale), Germany
| | - Stephan M Feller
- Institute of Molecular Medicine, Charles Tanford Protein Research Center, Martin-Luther-University Halle-Wittenberg, Kurt-Mothes-Straße 3a, 06120, Halle (Saale), Germany
| | - Fred Schaper
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, Gebäude 28/Pfälzer Platz, 39106, Magdeburg, Germany.
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Han SH, Yun SH, Shin YK, Park HT, Park JI. Heat Shock Protein 90 is Required for cAMP-Induced Differentiation in Rat Primary Schwann Cells. Neurochem Res 2019; 44:2643-2657. [PMID: 31606837 DOI: 10.1007/s11064-019-02885-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/29/2019] [Accepted: 09/30/2019] [Indexed: 12/12/2022]
Abstract
Schwann cells (SCs) play an important role in producing myelin for rapid neurotransmission in the peripheral nervous system. Activation of the differentiation and myelination processes in SCs requires the expression of a series of transcriptional factors including Sox10, Oct6/Pou3f1, and Egr2/Krox20. However, functional interactions among several transcription factors are poorly defined and the important components of the regulatory network are still unknown. Until now, available evidence suggests that SCs require cAMP signaling to initiate the myelination program. Heat shock protein 90 (Hsp90) is known as a chaperone required to stabilize ErbB2 receptor. In recent years, it was reported that cAMP transactivated the ErbB2/ErbB3 signaling in SCs. However, the relationship between Hsp90 and cAMP-induced differentiation in SCs is undefined. Here we investigated the role of Hsp90 during cAMP-induced differentiation of SCs using Hsp90 inhibitor, geldanamycin and Hsp90 siRNA transfection. Our results showed that dibutyryl-cAMP (db-cAMP) treatment upregulated Hsp90 expression and led to nuclear translocation of Gab1/ERK, the downstream signaling pathway of the ErbB2 signaling mechanism in myelination. The expression of myelin-related genes and nuclear translocation of Gab1/ERK following db-cAMP treatment was inhibited by geldanamycin pretreatment and Hsp90 knockdown. These findings suggest that Hsp90 might play a role in cAMP-induced differentiation via stabilization of ErbB2 and nuclear translocation of Gab1/ERK in SCs.
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Affiliation(s)
- Sang-Heum Han
- Department of Biochemistry, Dong-A University College of Medicine, 32, Daesingongwon-ro, Seo-Gu, Busan, 49201, Republic of Korea.,Peripheral Neuropathy Research Center, Dong-A University, Busan, Republic of Korea
| | - Seong-Hoon Yun
- Department of Biochemistry, Dong-A University College of Medicine, 32, Daesingongwon-ro, Seo-Gu, Busan, 49201, Republic of Korea.,Peripheral Neuropathy Research Center, Dong-A University, Busan, Republic of Korea
| | - Yoon-Kyoung Shin
- Peripheral Neuropathy Research Center, Dong-A University, Busan, Republic of Korea
| | - Hwan-Tae Park
- Peripheral Neuropathy Research Center, Dong-A University, Busan, Republic of Korea. .,Department of Molecular Neuroscience, Dong-A University College of Medicine, 32, Daesingongwon-ro, Seo-Gu, Busan, 49201, Republic of Korea.
| | - Joo-In Park
- Department of Biochemistry, Dong-A University College of Medicine, 32, Daesingongwon-ro, Seo-Gu, Busan, 49201, Republic of Korea. .,Peripheral Neuropathy Research Center, Dong-A University, Busan, Republic of Korea.
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9
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Fan Q, Zhang L, Zhu W, Xue S, Song Y, Chang Q. Up-regulation of Grb2-associated binder 1 promotes hepatocyte growth factor-induced endothelial progenitor cell proliferation and migration. PeerJ 2019; 7:e6675. [PMID: 30956905 PMCID: PMC6442669 DOI: 10.7717/peerj.6675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 02/25/2019] [Indexed: 01/08/2023] Open
Abstract
Objectives Grb2-associated binder 1 (Gab1), a scaffolding adaptor protein, plays an important role in transmitting key signals that control cell growth, migration, and function from multiple tyrosine kinase receptors. This study was designed to investigate the influence of upregulation of Gab1 in endothelial progenitor cells (EPCs) stimulated with hepatocyte growth factor (HGF), and the underlying molecular mechanisms. Materials and Methods Endothelial progenitor cells isolated from human umbilical cord blood were identified and divided into four groups. EPCs in the Control group were cultured normally; those in the Control+HGF group were treated with HGF stimulation; those in the AD-Gab1 group were transfected with adenovirus containing the Gab1 gene but not treated with HGF stimulation; and, those in the AD-Gab1+HGF group were treated with both HGF stimulation and transfection with adenovirus containing the Gab1 gene. Subsequently, Gab1 expression and proliferation and migration ability were compared for EPCs grown under different conditions. Furthermore, we measured phosphorylation levels of three key proteins Gab1, SHP2, and ERK1/2. Results The AD-Gab1+HGF group had the highest expression of Gab1 and higher proliferation and migration than the other three groups. Conclusions Upregulation of Gab1 promoted HGF-induced EPC proliferation and migration. Mechanistically, HGF stimulated Gab1 tyrosine phosphorylation in EPCs, thus leading to activation of extracellular regulated MAP kinase 1/2, which is involved in proliferation and migration signaling.
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Affiliation(s)
- Qing Fan
- Qingdao University, Qingdao, China.,Cardiovascular Surgery Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Liyu Zhang
- Qingdao University, Qingdao, China.,Cardiovascular Surgery Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wenjie Zhu
- Qingdao University, Qingdao, China.,Cardiovascular Surgery Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Sheng Xue
- Institute for Translational Medicine, Qingdao University, Qingdao, China
| | - Yisheng Song
- Qingdao University, Qingdao, China.,Cardiovascular Surgery Department, The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Qing Chang
- Qingdao University, Qingdao, China.,Cardiovascular Surgery Department, The Affiliated Hospital of Qingdao University, Qingdao, China
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Wang X, Peng J, Yang Z, Zhou PJ, An N, Wei L, Zhu HH, Lu J, Fang YX, Gao WQ. Elevated expression of Gab1 promotes breast cancer metastasis by dissociating the PAR complex. J Exp Clin Cancer Res 2019; 38:27. [PMID: 30665442 PMCID: PMC6341703 DOI: 10.1186/s13046-019-1025-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 01/06/2019] [Indexed: 01/14/2023]
Abstract
BACKGROUND Breast cancer (BCa) remains as the second leading cause of cancer-related death in women worldwide. The majority of the deaths are due to its progression to metastatic BCa. Although Grb2-associated binding protein 1 (Gab1) has been implicated in tumor proliferation and metastasis in multiple tumors including colorectal cancer, hepatocellular carcinoma and ovarian cancer, whether and how it regulates BCa metastasis are still poorly understood. METHODS Western blot assay and immunohistochemical (IHC) staining were performed to assess expression of Gab1 in primary and metastatic BCa clinical samples. Biological function assay studies in vitro and in vivo were employed to investigate the functions of Gab1 during BCa metastasis. Co-immunoprecipitation (co-IP) assessment, western blot assay and immunofluorescence (IF) staining were carried out to investigate the underlying mechanism for the function of Gab1 on BCa metastasis. RESULTS In this study, we found that expression level of Gab1 was increased significantly in BCa tissue samples compared to that in benign mammary hyperplastic tissues. Furthermore, elevated expression of Gab1 was positively associated with metastasis in HER2 and TNBC subtypes of BCa. In BCa cell line MDA-MB-231 and SK-BR3 cells, stable overexpression of Gab1 promoted, while knockdown of Gab1 inhibited cell migration in vitro and metastasis in vivo. Mechanistically, overexpression of Gab1 enhanced its interaction with Par3, a key component of the polarity-associated partitioning defective (PAR) complex, leading to a dissociation of the PAR complex. Consequently, dissociated PAR complex induced epithelial-to-mesenchymal transition (EMT) for breast tumor metastasis. By restoration assessment, we found that only re-expression of a fully functional Gab1, but not a mutant Gab1 that harbors either Par3 binding-deficiency or Par1b binding-deficiency, could reverse the repressive phenotype of cell migration in vitro and metastasis in vivo due to Gab1 knockdown. CONCLUSIONS Our findings indicate that elevated expression of Gab1 promotes BCa metastasis by dissociating the PAR complex that leads to EMT, implicating a role of Gab1 as a potential biomarker of metastatic BCa. Moreover, inhibition of Gab1 expression might be a promising therapeutic strategy for BCa metastasis.
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Affiliation(s)
- Xiao Wang
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Jing Peng
- Department of Breast Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Ziqiang Yang
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Pei-Jie Zhou
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Na An
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Lianzi Wei
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Helen He Zhu
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China
| | - Jinsong Lu
- Department of Breast Surgery, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China.
| | - Yu-Xiang Fang
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China.
| | - Wei-Qiang Gao
- State Key Laboratory of Oncogenes and Related Genes, Renji-MedX Stem Cell Research Center, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, 200127, China. .,School of Biomedical Engineering & Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, 200030, China.
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11
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Sutherland L, Ruhe M, Gattegno-Ho D, Mann K, Greaves J, Koscielniak M, Meek S, Lu Z, Waterfall M, Taylor R, Tsakiridis A, Brown H, Maciver SK, Joshi A, Clinton M, Chamberlain LH, Smith A, Burdon T. LIF-dependent survival of embryonic stem cells is regulated by a novel palmitoylated Gab1 signalling protein. J Cell Sci 2018; 131:jcs.222257. [PMID: 30154213 PMCID: PMC6176924 DOI: 10.1242/jcs.222257] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Accepted: 08/17/2018] [Indexed: 01/25/2023] Open
Abstract
The cytokine leukaemia inhibitory factor (LIF) promotes self-renewal of mouse embryonic stem cells (ESCs) through activation of the transcription factor Stat3. However, the contribution of other ancillary pathways stimulated by LIF in ESCs, such as the MAPK and PI3K pathways, is less well understood. We show here that naive-type mouse ESCs express high levels of a novel effector of the MAPK and PI3K pathways. This effector is an isoform of the Gab1 (Grb2-associated binder protein 1) adaptor protein that lacks the N-terminal pleckstrin homology (PH) membrane-binding domain. Although not essential for rapid unrestricted growth of ESCs under optimal conditions, the novel Gab1 variant (Gab1β) is required for LIF-mediated cell survival under conditions of limited nutrient availability. This enhanced survival is absolutely dependent upon a latent palmitoylation site that targets Gab1β directly to ESC membranes. These results show that constitutive association of Gab1 with membranes through a novel mechanism promotes LIF-dependent survival of murine ESCs in nutrient-poor conditions.
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Affiliation(s)
- Linda Sutherland
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Madeleine Ruhe
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Daniela Gattegno-Ho
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Karanjit Mann
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK,Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK
| | - Jennifer Greaves
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK
| | - Magdalena Koscielniak
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Stephen Meek
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Zen Lu
- Division of Genetics and Genomics, The Roslin Institute and R(D)SVS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Martin Waterfall
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Ryan Taylor
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Anestis Tsakiridis
- Department of Biomedical Science, The University of Sheffield, Alfred Denny Building, Western Bank, Sheffield S10 2TN, UK
| | - Helen Brown
- Division of Genetics and Genomics, The Roslin Institute and R(D)SVS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | | | - Anagha Joshi
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Michael Clinton
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
| | - Luke H. Chamberlain
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow G4 0RE, UK
| | - Austin Smith
- Wellcome Trust-Medical Research Council Stem Cell Institute, University of Cambridge, Cambridge CB2 1QT, UK
| | - Tom Burdon
- Division of Developmental Biology, The Roslin Institute and R(D)VS, University of Edinburgh, Midlothian, EH25 9RG, UK
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12
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Shao NY, Wang DX, Wang Y, Li Y, Zhang ZQ, Jiang Q, Luo W, Cao C. MicroRNA-29a-3p Downregulation Causes Gab1 Upregulation to Promote Glioma Cell Proliferation. Cell Physiol Biochem 2018; 48:450-460. [PMID: 30016785 DOI: 10.1159/000491776] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 04/26/2018] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND/AIMS Glioma causes significant human mortalities annually. Molecularly-targeted therapy is a focus of glioma research. METHODS Grb2-associated binding 1 (Gab1) expression and microRNA-29a-3p ("miR-29a-3p") expression in human glioma cells and tissues were tested by Western blotting assay and qRT-PCR assay. shRNA/siRNA strategy was applied to silence Gab1 in human glioma cells. miR-29a or anti-sense miR-29a construct was transfected to human glioma cells. Cell proliferation was tested by BrdU ELISA assay and cell counting assay. RESULTS We show that expression of Gab1 was significantly elevated in human glioma tissues and cells, which correlated with downregulation of its putative microRNA: miR-29a-3p. In A172 glioma cells and primary human glioma cells, Gab1 shRNA/siRNA inhibited Akt-Erk activation and cell proliferation. Forced-expression of miR-29a-3p downregulated Gab1, inhibiting glioma cell proliferation, whereas miR-29a-3p was in-effective on cell proliferation in Gab1-silenced A172 cells. Furthermore, introduction of a 3'-untranslated region (3'-UTR) mutant Gab1 (UTR-G160A) blocked miR-29a-3p-induced inhibition on Akt signaling and A172 cell proliferation. CONCLUSIONS miR-29a-3p downregulation leads to Gab1 upregulation to promote glioma cell proliferation.
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Affiliation(s)
- Nai-Yuan Shao
- Department of Neurosurgery, the Third Affiliated Hospital of Soochow University, Changzhou, China
| | - Dong-Xing Wang
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Yin Wang
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Ya Li
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Zhi-Qing Zhang
- Institute of Neuroscience, Soochow University, Suzhou, China
| | - Qin Jiang
- The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Weifeng Luo
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou, China
| | - Cong Cao
- Department of Neurology, the Second Affiliated Hospital of Soochow University, Suzhou, China.,Institute of Neuroscience, Soochow University, Suzhou, China.,The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China.,North District, The Municipal Hospital of Suzhou, Suzhou, China
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13
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Ruan JW, Yao C, Bai JY, Zhou XZ. microRNA-29a inhibition induces Gab1 upregulation to protect OB-6 human osteoblasts from hydrogen peroxide. Biochem Biophys Res Commun 2018; 503:607-614. [PMID: 29902453 DOI: 10.1016/j.bbrc.2018.06.048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 06/10/2018] [Indexed: 11/25/2022]
Abstract
The present study determines the role of the Gab1 in hydrogen peroxide (H2O2)-induced death of human osteoblasts. We show that Gab1 is required for H2O2-induced Akt activation to promote osteoblast survival. In OB-6 human osteoblasts, Gab1 silencing (by targeted-shRNA) or complete knockout (by CRISPR-Cas9 KO plasmid) largely attenuated Akt activation by H2O2. Gab1-depleted OB-6 cells were more vulnerable to H2O2. Conversely, forced over-expression of Gab1 by an adenovirus vector increased Akt activation to protect OB-6 cells from H2O2. Significantly, the anti-sense of microRNA-29a ("antagomiR-29a") induced Gab1 expression to facilitate H2O2-induced Akt activation, which protected OB-6 cells from apoptosis. AntagomiR-29a was however ineffective in Gab1-deficient and Akt-inhibited OB-6 cells. Forced over-expression of miR-29a induced Gab1 downregulation to inhibit H2O2-induced Akt activation, causing enhanced OB-6 cell death. miR-29a-induced actions were abolished by an adenovirus constitutively-active Akt1 (Ad-caAkt1) in OB-6 cells. Together, microRNA-29a inhibition induces Gab1 upregulation and Akt activation to protect OB-6 osteoblasts from H2O2.
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Affiliation(s)
- Jian-Wei Ruan
- Department of Orthopedics, The Second Affiliated Hospital of Suzhou University, Suzhou, China; Department of Orthopedics, Taizhou Municipal Hospital, Taizhou, China
| | - Chen Yao
- Orthopedic Department, Affiliated Hospital of Nanjing University of Chinese Medicine, Nanjing, China
| | - Jin-Yu Bai
- Department of Orthopedics, The Second Affiliated Hospital of Suzhou University, Suzhou, China
| | - Xiao-Zhong Zhou
- Department of Orthopedics, The Second Affiliated Hospital of Suzhou University, Suzhou, China.
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14
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Zhang XP, Li KR, Yu Q, Yao MD, Ge HM, Li XM, Jiang Q, Yao J, Cao C. Ginsenoside Rh2 inhibits vascular endothelial growth factor-induced corneal neovascularization. FASEB J 2018; 32:3782-3791. [PMID: 29465315 DOI: 10.1096/fj.201701074rr] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
VEGF-induced neovascularization plays a pivotal role in corneal neovascularization (CoNV). The current study investigated the potential effect of ginsenoside Rh2 (GRh2) on neovascularization. In HUVECs, pretreatment with GRh2 largely attenuated VEGF-induced cell proliferation, migration, and vessel-like tube formation in vitro. At the molecular level, GRh2 disrupted VEGF-induced VEGF receptor 2 (VEGFR2)-Grb-2-associated binder 1 (Gab1) association in HUVECs, causing inactivation of downstream AKT and ERK signaling. Gab1 knockdown (by targeted short hairpin RNA) similarly inhibited HUVEC proliferation and migration. Notably, GRh2 was ineffective against VEGF in Gab1-silenced HUVECs. In a mouse cornea alkali burn model, GRh2 eyedrops inhibited alkali-induced neovascularization and inflammatory cell infiltrations in the cornea. Furthermore, alkali-induced corneal expression of mRNAs/long noncoding RNAs in cornea were largely attenuated by GRh2. Overall, GRh2 inhibits VEGF-induced angiogenic effect via inhibiting VEGFR2-Gab1 signaling in vitro. It also alleviates angiogenic and inflammatory responses in alkali burn-treated mouse corneas.-Zhang, X.-P., Li, K.-R., Yu, Q., Yao, M.-D., Ge, H.-M., Li, X.-M., Jiang, Q., Yao, J., Cao, C. Ginsenoside Rh2 inhibits vascular endothelial growth factor-induced corneal neovascularization.
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Affiliation(s)
- Xiao-Pei Zhang
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Ke-Ran Li
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Qing Yu
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Mu-Di Yao
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Hui-Min Ge
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Xiu-Miao Li
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Qin Jiang
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Jin Yao
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China
| | - Cong Cao
- The Fourth School of Clinical Medicine, The Affiliated Eye Hospital, Nanjing Medical University, Nanjing, China.,Jiangsu Key Laboratory of Neuropsychiatric Diseases Research and Institute of Neuroscience, Soochow University, Suzhou, China; and.,North District, The Municipal Hospital of Suzhou, Suzhou, China
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15
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Li X, Li X, Ren Y, Yin Z, Quan X, Xue X, Zhou B. Polymorphisms of rs1347093 and rs1397529 are associated with lung cancer risk in northeast Chinese population. Oncotarget 2017; 8:94862-94871. [PMID: 29212272 PMCID: PMC5706918 DOI: 10.18632/oncotarget.22030] [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] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 09/23/2017] [Indexed: 11/25/2022] Open
Abstract
Lung cancer is one of the malignant tumors with the highest morbidity and mortality all over the world. Here we researched the association between two SNPs (rs1347093 in MIR217HG and rs1397529 in Gab1) and the risk of lung cancer in northeast Chinese population, including 825 cases and 766 controls. We carried out χ2 test, unconditional logistic regression analysis and crossover analysis to estimate the relationship between SNPs and lung cancer risk and the interaction between SNPs and smoking on susceptibility to lung cancer. The results indicated that rs1347093, rs1397529 polymorphisms were associated with lung cancer risk, especially with adenocarcinoma risk. Dominant genetic model of the rs1347093 was associated with reduced risk of lung cancer compared to CC genotype (AC+AA vs. CC: adjusted OR = 0.599, 95%CI = 0.418-0.858, P=0.005). For rs1347093, the similar result was found. Dominant genetic model of the rs1397529 was associated with reduced risk of lung cancer compared to AA genotype (AC+CC vs. AA: adjusted OR = 0.664, 95%CI = 0.491-0.897, P=0.008). There is no significant interaction between rs1347093, rs1397529 polymorphism and smoking on susceptibility to lung cancer. Our study might demonstrate that rs1347093 in MIR217HG and rs1397529 in Gab1 could be meaningful as the novel biomarker for lung cancer risk.
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Affiliation(s)
- Xiaoying Li
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
| | - XueLian Li
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
| | - Yangwu Ren
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
| | - Zhihua Yin
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
| | - Xiaowei Quan
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
| | - Xiaoxia Xue
- The Third Center of Laboratory Technology and Experimental Medicine, China Medical University, Shenyang, China
| | - Baosen Zhou
- Department of Epidemiology, School of Public Health, China Medical University, Shenyang, China
- Key Laboratory of Cancer Etiology and Prevention (China Medical University), Liaoning Provincial Department of Education, Liaoning, China
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16
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Gill K, Macdonald-Obermann JL, Pike LJ. Epidermal growth factor receptors containing a single tyrosine in their C-terminal tail bind different effector molecules and are signaling-competent. J Biol Chem 2017; 292:20744-20755. [PMID: 29074618 DOI: 10.1074/jbc.m117.802553] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 10/13/2017] [Indexed: 01/07/2023] Open
Abstract
The EGF receptor is a classic receptor tyrosine kinase. It contains nine tyrosines in its C-terminal tail, many of which are phosphorylated and bind proteins containing SH2 or phosphotyrosine-binding (PTB) domains. To determine how many and which tyrosines are required to enable EGF receptor-mediated signaling, we generated a series of EGF receptors that contained only one tyrosine in their C-terminal tail. Assays of the signaling capabilities of these single-Tyr EGF receptors indicated that they can activate a range of downstream signaling pathways, including MAP kinase and Akt. The ability of the single-Tyr receptors to signal correlated with their ability to bind Gab1 (Grb2-associated binding protein 1). However, Tyr-992 appeared to be almost uniquely required to observe activation of phospholipase Cγ. These results demonstrate that multiply phosphorylated receptors are not required to support most EGF-stimulated signaling but identify Tyr-992 and its binding partners as a unique node within the network. We also studied the binding of the isolated SH2 domain of Grb2 (growth factor receptor-bound protein 2) and the isolated PTB domain of Shc (SHC adaptor protein) to the EGF receptor. Although these adapter proteins bound readily to wild-type EGF receptor, they bound poorly to the single-Tyr EGF receptors, even those that bound full-length Grb2 and Shc well. This suggests that in addition to pTyr-directed associations, secondary interactions between the tail and regions of the adapter proteins outside of the SH2/PTB domains are important for stabilizing the binding of Grb2 and Shc to the single-Tyr EGF receptors.
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Affiliation(s)
- Kamaldeep Gill
- From the Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Jennifer L Macdonald-Obermann
- From the Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110
| | - Linda J Pike
- From the Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, St. Louis, Missouri 63110
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17
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Bongartz H, Hessenkemper W, Müller C, Fensky M, Fritsch J, Mandel K, Behrmann I, Haan C, Fischer T, Feller SM, Schaper F. The multi-site docking protein Gab1 is constitutively phosphorylated independent from its recruitment to the plasma membrane in Jak2-V617F-positive cells and mediates proliferation of human erythroleukaemia cells. Cell Signal 2017; 35:37-47. [PMID: 28365441 DOI: 10.1016/j.cellsig.2017.03.021] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 02/28/2017] [Accepted: 03/26/2017] [Indexed: 10/19/2022]
Abstract
The constitutively active Janus kinase 2 mutant Jak2-V617F is responsible for cytokine-independent growth of hematopoietic cells and the development of myeloproliferative neoplasms, such as polycythaemia vera and essential thrombocythaemia. Cells expressing Jak2-V617F exhibit constitutive STAT, MAPK, and PI3K signalling, and constitutive association of the multi-site docking protein Gab1 to PIP3 at the plasma membrane. Here, we demonstrate the crucial role of Gab1 for the proliferation of Jak2-V617F-positive human erythroleukaemia (HEL) cells. In Jak2-V617F-expressing cells Gab1 is constitutively phosphorylated by Erk1/2 on serine residue 552, which regulates binding to PIP3. Additionally, Gab1 is constitutively phosphorylated on tyrosine residue 627. Tyrosine 627 is a SHP2 binding site and required for Gab1-dependent Erk1/2 activation. As previously shown, Jak2-V617F-dependent Erk1/2 and PI3K activation act synergistically on the proliferation of Jak2-V617F-positive cells. Here, we examined whether constitutive membrane association of Gab1 explains cytokine-independent Gab1 phosphorylation in Jak2-V617F-expressing cells. Although we could demonstrate Jak2-V617F-dependent constitutive serine 552 and tyrosine 627 phosphorylation of Gab1, interestingly, both phosphorylations do not require binding of Gab1 to PIP3 at the plasma membrane. Instead, we observed a constitutive interaction of Gab1 with the erythropoietin receptor in Jak2-V617F-expressing cells, which depends on Janus kinase activity. Thus, constitutive Gab1-dependent signalling in Jak2-V617F-expressing cells does not occur due to the constitutive association of Gab1 with PIP3 at the plasma membrane.
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Affiliation(s)
- Hannes Bongartz
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Wiebke Hessenkemper
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Christian Müller
- Department of Hematology and Oncology, Medical Center, Otto-von-Guericke University, Leipziger Straße 44, 39120 Magdeburg, Germany.
| | - Melissa Fensky
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Johannes Fritsch
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Katharina Mandel
- Institute of Molecular Medicine, Martin-Luther-University Halle-Wittenberg, ZAMED, Heinrich-Damerow-Straße 1, 06120 Halle, Germany.
| | - Iris Behrmann
- University of Luxembourg, Signal Transduction Laboratory, Life Sciences Research Unit, 6, avenue du Swing, L-4367 Belvaux, Luxembourg.
| | - Claude Haan
- University of Luxembourg, Signal Transduction Laboratory, Life Sciences Research Unit, 6, avenue du Swing, L-4367 Belvaux, Luxembourg.
| | - Thomas Fischer
- Department of Hematology and Oncology, Medical Center, Otto-von-Guericke University, Leipziger Straße 44, 39120 Magdeburg, Germany; Health Campus Immunology, Infectiology and Inflammation, Otto-von-Guericke-University, Leipziger Straße 44, 39120 Magdeburg, Germany.
| | - Stephan M Feller
- Institute of Molecular Medicine, Martin-Luther-University Halle-Wittenberg, ZAMED, Heinrich-Damerow-Straße 1, 06120 Halle, Germany.
| | - Fred Schaper
- Institute of Biology, Department of Systems Biology, Otto-von-Guericke University, Universitätsplatz 2, 39106 Magdeburg, Germany.
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18
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Lucarelli S, Delos Santos RC, Antonescu CN. Measurement of Epidermal Growth Factor Receptor-Derived Signals Within Plasma Membrane Clathrin Structures. Methods Mol Biol 2017; 1652:191-225. [PMID: 28791645 DOI: 10.1007/978-1-4939-7219-7_15] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The epidermal growth factor (EGF) receptor (EGFR) is an important regulator of cell growth, proliferation, survival, migration, and metabolism. EGF binding to EGFR triggers the activation of the receptor's intrinsic kinase activity, in turn eliciting the recruitment of many secondary signaling proteins and activation of downstream signals, such as the activation of phosphatidylinositol-3-kinase (PI3K) and Akt, a process requiring the phosphorylation of Gab1. While the identity of many signals that can be activated by EGFR has been revealed, how the spatiotemporal organization of EGFR signaling within cells controls receptor outcome remains poorly understood. Upon EGF binding at the plasma membrane, EGFR is internalized by clathrin-mediated endocytosis following recruitment to clathrin-coated pits (CCPs). Further, plasma membrane CCPs, but not EGFR internalization, are required for EGF-stimulated Akt phosphorylation. Signaling intermediates such as phosphorylated Gab1, which lead to Akt phosphorylation, are enriched within CCPs upon EGF stimulation. These findings indicate that some plasma membrane CCPs also serve as signaling microdomains required for certain facets of EGFR signaling and are enriched in key EGFR signaling intermediates. Understanding how the spatiotemporal organization of EGFR signals within CCP microdomains controls receptor signaling outcome requires imaging methods that can systematically resolve and analyze the properties of CCPs, EGFR and key signaling intermediates. Here, we describe methods using total internal reflection fluorescence microscopy imaging and analysis to systematically study the enrichment of EGFR and key EGFR-derived signals within CCPs.
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Affiliation(s)
- Stefanie Lucarelli
- Department of Chemistry and Biology, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3.,Graduate Program in Molecular Science, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3
| | - Ralph Christian Delos Santos
- Department of Chemistry and Biology, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3.,Graduate Program in Molecular Science, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3
| | - Costin N Antonescu
- Department of Chemistry and Biology, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3. .,Graduate Program in Molecular Science, Ryerson University, 350 Victoria Street, Toronto, ON, Canada, M5B 2K3. .,Keenan Research Centre for Biomedical Science of St. Michael's Hospital, 30 Bond Street, Toronto, ON, Canada, M5B 1W8.
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19
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Deng R, Zhao X, Qu Y, Chen C, Zhu C, Zhang H, Yuan H, Jin H, Liu X, Wang Y, Chen Q, Huang J, Yu J. Shp2 SUMOylation promotes ERK activation and hepatocellular carcinoma development. Oncotarget 2016; 6:9355-69. [PMID: 25823821 PMCID: PMC4496222 DOI: 10.18632/oncotarget.3323] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Accepted: 02/09/2015] [Indexed: 11/25/2022] Open
Abstract
Shp2, an ubiquitously expressed protein tyrosine phosphatase, is essential for regulation of Ras/ERK signaling pathway and tumorigenesis. Here we report that Shp2 is modified by SUMO1 at lysine residue 590 (K590) in its C-terminus, which is reduced by SUMO1-specific protease SENP1. Analysis of wild-type Shp2 and SUMOylation-defective Shp2(K590R) mutant reveals that SUMOylation of Shp2 promotes EGF-stimulated ERK signaling pathway and increases anchorage-independent cell growth and xenografted tumor growth of hepatocellular carcinoma (HCC) cell lines. Furthermore, we find that mutant Shp2(K590R) reduces its binding with the scaffolding protein Gab1, and consistent with this, knockdown of SENP1 increased the interaction between Shp2 and Gab1. More surprisingly, we show that human Shp2 (hShp2) and mouse Shp2 (mShp2) have differential effects on ERK activation as a result of different SUMOylation level, which is due to the event of K590 at hShp2 substituted by R594 at mShp2. In summary, our data demonstrate that SUMOylation of Shp2 promotes ERK activation via facilitating the formation of Shp2-Gab1 complex and thereby accelerates HCC cell and tumor growth, which presents a novel regulatory mechanism underlying Shp2 in regulation of HCC development.
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Affiliation(s)
- Rong Deng
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xian Zhao
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - YingYing Qu
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Cheng Chen
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Changhong Zhu
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Hailong Zhang
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Haihua Yuan
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Hui Jin
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Xin Liu
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Yanli Wang
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Qin Chen
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Jian Huang
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
| | - Jianxiu Yu
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.,State Key Laboratory of Oncogenes and Related Genes, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.,Institute of Oncology & Department of Oncology, Shanghai 9th People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China
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20
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Xu S, Ha CH, Wang W, Xu X, Yin M, Jin FQ, Mastrangelo M, Koroleva M, Fujiwara K, Jin ZG. PECAM1 regulates flow-mediated Gab1 tyrosine phosphorylation and signaling. Cell Signal 2015; 28:117-124. [PMID: 26706435 DOI: 10.1016/j.cellsig.2015.12.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 12/09/2015] [Accepted: 12/14/2015] [Indexed: 01/25/2023]
Abstract
Endothelial dysfunction, characterized by impaired activation of endothelial nitric oxide (NO) synthase (eNOS) and ensued decrease of NO production, is a common mechanism of various cardiovascular pathologies, including hypertension and atherosclerosis. Laminar blood flow-mediated specific signaling cascades modulate vascular endothelial cells (ECs) structure and functions. We have previously shown that flow-stimulated Gab1 (Grb2-associated binder-1) tyrosine phosphorylation mediates eNOS activation in ECs, which in part confers laminar flow atheroprotective action. However, the molecular mechanisms whereby flow regulates Gab1 tyrosine phosphorylation and its downstream signaling events remain unclear. Here we show that platelet endothelial cell adhesion molecule-1 (PECAM1), a key molecule in an endothelial mechanosensing complex, specifically mediates Gab1 tyrosine phosphorylation and its downstream Akt and eNOS activation in ECs upon flow rather than hepatocyte growth factor (HGF) stimulation. Small interfering RNA (siRNA) targeting PECAM1 abolished flow- but not HGF-induced Gab1 tyrosine phosphorylation and Akt, eNOS activation as well as Gab1 membrane translocation. Protein-tyrosine phosphatase SHP2, which has been shown to interact with Gab1, was involved in flow signaling and HGF signaling, as SHP2 siRNA diminished the flow- and HGF-induced Gab1 tyrosine phosphorylation, membrane localization and downstream signaling. Pharmacological inhibition of PI3K decreased flow-, but not HGF-mediated Gab1 phosphorylation and membrane localization as well as eNOS activation. Finally, we observed that flow-mediated Gab1 and eNOS phosphorylation in vivo induced by voluntary wheel running was reduced in PECAM1 knockout mice. These results demonstrate a specific role of PECAM1 in flow-mediated Gab1 tyrosine phosphorylation and eNOS signaling in ECs.
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Affiliation(s)
- Suowen Xu
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Chang Hoon Ha
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Weiye Wang
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Xiangbin Xu
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Meimei Yin
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Felix Q Jin
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Michael Mastrangelo
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Marina Koroleva
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Keigi Fujiwara
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA
| | - Zheng Gen Jin
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642, USA.
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Fan Y, Yang F, Cao X, Chen C, Zhang X, Zhang X, Lin W, Wang X, Liang C. Gab1 regulates SDF-1-induced progression via inhibition of apoptosis pathway induced by PI3K/AKT/Bcl-2/BAX pathway in human chondrosarcoma. Tumour Biol 2016; 37:1141-9. [PMID: 26276357 DOI: 10.1007/s13277-015-3815-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 07/20/2015] [Indexed: 10/23/2022] Open
Abstract
In recent decades, the stromal cell-derived factor-l (SDF-1) and Gab1 have been investigated to be involved in oncogenesis. However, it is scarcely reported that SDF-1-Gab1 pathway mediates proliferation and apoptosis in human chondrosarcoma (CS). In this study, we assessed the expression of Gab1 in 90 CS solid tumors by immunohistochemistry, immunoblotting, and qRT-PCR, and then, some in vitro assays were also applied to CS cells treated with SDF-1. We observed that the overexpression of Gab1 was positively correlated with lung metastasis and recurrence, and acts as an independent prognostic factor for CS patients. Gab1 expression was up-regulated in response to SDF-1 stimulation in CS cell line JJ012, SW1353, L3252. Overexpression of Gab1 increased Bcl-2/BAX ratio to promote cell growth via PI3K/AKT. On the other hand, silencing of Gab1 accelerated apoptosis and repressed the growth of CS cells, which further caused the inhibition of G1/S phase transition and decreased invasion capacity in CS cell lines. In vivo assay identified that the knockdown of Gab1 interfered with the tumor mass formation. In conclusion, our data identified overexpression of Gab1 in CS tissues, and Gab1 can be recommended as a novel biomarker for diagnosis and prognosis in patients with CS. Additionally, PI3K/AKT/Bcl-2/BAX axis was involved in Gab1-induced CS progression, indicating Gab1 might act as a new target for the treatment of CS patients.
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22
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Aasrum M, Ødegård J, Thoresen GH, Brusevold IJ, Sandnes DL, Christoffersen T. Gab1 amplifies signaling in response to low-intensity stimulation by HGF. Cell Biol Int 2015; 39:1177-84. [PMID: 26146811 DOI: 10.1002/cbin.10511] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Accepted: 07/02/2015] [Indexed: 01/15/2023]
Abstract
The receptor tyrosine kinases EGFR and Met induce phosphorylation of the docking protein Gab1, and there is evidence that Gab1 may have a role in the signaling from these receptors. Studying hepatocytes, we previously found that although Gab1 mechanistically interacted in different ways with EGFR and Met, it was involved in mitogenic signaling induced by both EGF and HGF. It has been reported that in EGFR, Gab1 is required particularly at a low dose of EGF. Whether this also applies to HGF/Met signaling has not been investigated. We have studied the role of Gab1 in activation of the Akt and ERK pathways at low- and high-intensity stimulation with EGF and HGF in cultured hepatocytes. In cells where Gab1 was depleted by a specific Gab1-directed siRNA, the EGF-induced phosphorylation of ERK was lowered and HGF-induced phosphorylation of both ERK and Akt was substantially reduced. These effects were more marked at low-dose HGF stimulation. The inhibitory consequence of Gab1 depletion was particularly pronounced for HGF-induced Akt phosphorylation. The results suggest that Gab1 is an important signal amplifier for low-intensity stimulation by HGF.
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Affiliation(s)
- Monica Aasrum
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway
| | - John Ødegård
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway
| | - Gunn Hege Thoresen
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway.,Department of Pharmaceutical Biosciences, School of Pharmacy, University of Oslo, P.O. Box 1068, Blindern, 0316, Oslo, Norway
| | - Ingvild J Brusevold
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway.,Department of Oral Biology, University of Oslo, P.O. Box 1052, Blindern, 0316, Oslo, Norway.,Department of Paediatric Dentistry and Behavioural Science, Faculty of Dentistry, University of Oslo, P.O. Box 1052, Blindern, 0316, Oslo, Norway
| | - Dagny L Sandnes
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway
| | - Thoralf Christoffersen
- Department of Pharmacology, Institute of Clinical Medicine, Oslo University Hospital, University of Oslo, P.O. Box 1057, Blindern, 0316, Oslo, Norway
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23
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Sang H, Li T, Li H, Liu J. Gab1 regulates proliferation and migration through the PI3K/Akt signaling pathway in intrahepatic cholangiocarcinoma. Tumour Biol 2015; 36:8367-77. [PMID: 26014518 DOI: 10.1007/s13277-015-3590-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Accepted: 05/19/2015] [Indexed: 01/04/2023] Open
Abstract
Intrahepatic cholangiocarcinoma is the second most common primary malignant tumor of the liver, and it originates from the intrahepatic biliary duct epithelium. Prognosis is poor due to lack of effective comprehensive treatments. In this study, we assessed the expression of Gab1, VEGFR-2, and MMP-9 in intrahepatic cholangiocarcinoma solid tumors by immunohistochemistry and determined whether their expression was associated with clinical and pathological features. We found that expression of Gab1, VEGFR-2, and MMP-9 was highly and positively correlated with each other and with lymph node metastasis and TNM stage in intrahepatic cholangiocarcinoma tissues. Interference of Gab1 and VEGFR-2 expression via siRNA in the intrahepatic cholangiocarcinoma cell line RBE resulted in decreased PI3K/Akt pathway activity. Inhibition of Gab1 and VEGFR-2 expression also caused decreased cell proliferation, cell cycle arrested in G1 phase, increased apoptosis, and decreased invasion in RBE cells. These results suggest that Gab1, VEGFR-2, and MMP-9 contribute significantly to the highly malignant behavior of intrahepatic cholangiocarcinoma. The regulation of growth, apoptosis, and invasion by Gab1 through the VEGFR-2/Gab1/PI3K/Akt signaling pathway may represent potential targets for improving the treatment of intrahepatic cholangiocarcinoma.
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24
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Jiang B, Deng Q, Huo Y, Li W, Shibuya M, Luo J. Endothelial Gab1 deficiency aggravates splenomegaly in portal hypertension independent of angiogenesis. Am J Physiol Gastrointest Liver Physiol 2015; 308:G416-26. [PMID: 25501549 DOI: 10.1152/ajpgi.00292.2014] [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] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Certain pathological changes, including angiogenesis, actively contribute to the pathogenesis of splenomegaly in portal hypertension (PH), although the detailed molecular and cellular mechanisms remain elusive. In this study, we demonstrated that endothelial Grb-2-associated binder 1 (Gab1) plays a negative role in PH-associated splenomegaly independent of angiogenesis. PH, which was induced by partial portal vein ligation, significantly enhanced Gab1 expression in endothelial cells in a time-dependent manner. Compared with controls, endothelium-specific Gab1 knockout (EGKO) mice exhibited a significant increase in spleen size while their PH levels remained similar. Pathological analysis indicated that EGKO mice developed more severe hyperactive white pulp and fibrosis in the enlarged spleen but less angiogenesis in both the spleen and mesenteric tissues. Mechanistic studies showed that the phosphorylation of endothelial nitric oxide synthase (eNOS) in EGKO mice was significantly lower than in controls. In addition, the dysregulation of fibrosis and inflammation-related transcription factors [e.g., Krüppel-like factor (KLF) 2 and KLF5] and the upregulation of cytokine genes (e.g., TNF-α and IL-6) were observed in EGKO mice. We thus propose that endothelial Gab1 mediates multiple pathways in inhibition of the pathogenesis of splenomegaly in PH via prevention of endothelial dysfunction and overproduction of proinflammatory/profibrotic cytokines.
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Affiliation(s)
- Beibei Jiang
- Laboratory of Vascular Biology, Institute of Molecular Medicine, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing, China
| | - Qiuping Deng
- Laboratory of Vascular Biology, Institute of Molecular Medicine, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing, China
| | - Yingqing Huo
- Laboratory of Vascular Biology, Institute of Molecular Medicine, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing, China
| | - Wei Li
- People's Hospital, Peking University, Beijing, China; and
| | - Masabumi Shibuya
- Institute of Physiology and Medicine, Jobu University, Takasaki, Japan
| | - Jincai Luo
- Laboratory of Vascular Biology, Institute of Molecular Medicine, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, Beijing, China;
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25
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Wang W, Xu S, Yin M, Jin ZG. Essential roles of Gab1 tyrosine phosphorylation in growth factor-mediated signaling and angiogenesis. Int J Cardiol 2014; 181:180-4. [PMID: 25528308 DOI: 10.1016/j.ijcard.2014.10.148] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 09/08/2014] [Accepted: 10/18/2014] [Indexed: 12/16/2022]
Abstract
Growth factors and their downstream receptor tyrosine kinases (RTKs) mediate a number of biological processes controlling cell function. Adaptor (docking) proteins, which consist exclusively of domains and motifs that mediate molecular interactions, link receptor activation to downstream effectors. Recent studies have revealed that Grb2-associated-binders (Gab) family members (including Gab1, Gab2, and Gab3), when phosphorylated on tyrosine residues, provide binding sites for multiple effector proteins, such as Src homology-2 (SH2)-containing protein tyrosine phosphatase 2 (SHP2) and phosphatidylinositol 3-kinase (PI3K) regulatory subunit p85, thereby playing important roles in transducing RTKs-mediated signals into pathways with diversified biological functions. Here, we provide an up-to-date overview on the domain structure and biological functions of Gab1, the most intensively studied Gab family protein, in growth factor signaling and biological functions, with a special focus on angiogenesis.
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Affiliation(s)
- Weiye Wang
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA
| | - Suowen Xu
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA
| | - Meimei Yin
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA
| | - Zheng Gen Jin
- Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY, 14642, USA.
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26
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Mouradian M, Kikawa K, Johnson E, Beck K, Pardini R. Key roles for GRB2-associated-binding protein 1, phosphatidylinositol-3-kinase, cyclooxygenase 2, prostaglandin E2 and transforming growth factor alpha in linoleic acid-induced upregulation of lung and breast cancer cell growth. Prostaglandins Leukot Essent Fatty Acids 2014; 90:105-115. [PMID: 24374147 PMCID: PMC4138981 DOI: 10.1016/j.plefa.2013.12.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 11/26/2013] [Accepted: 12/02/2013] [Indexed: 01/09/2023]
Abstract
The distribution of omega-6 and omega-3 polyunsaturated fatty acid (PUFA) intake in Western diets is disproportionate, containing an overabundance of the omega-6 PUFA, linoleic acid (LA; C18:2). Increased enrichment with LA has been shown to contribute to the enhancement of tumorigenesis in several cancer models. Previous work has indicated that phosphatidylinositol 3-kinase (PI3K) may play a key role in LA-induced tumorigenesis. However, the modes by which LA affects carcinogenesis have not been fully elucidated. In this study, a mechanism for LA-induced upregulation of cancer cell growth is defined. LA treatment enhanced cellular proliferation in BT-474 human breast ductal carcinoma and A549 human lung adenocarcinoma cell lines. Enrichment of LA increased cyclooxygenase (COX) activity and led to increases in prostaglandin E2 (PGE2), followed by increases in matrix metalloproteinase (MMP) and transforming growth factor alpha (TGF-α) levels, which are all key elements involved in the enhancement of cancer cell growth. Further investigation revealed that LA supplementation in both BT-474 breast and A549 lung cancer cell lines greatly increased the association between the scaffolding protein GRB2-associated-binding protein 1 (Gab1) and epidermal growth factor receptor (EGFR), although Gab1 protein levels were significantly decreased. These LA-induced changes were associated with increases in activated Akt (pAkt), a downstream signaling component in the PI3K pathway. Treatment with inhibitors of EGFR, PI3K and Gab1-specific siRNAs reversed the upregulation of pAkt, as well as the observed increases in cell proliferation by LA in both cell lines. A549 xenograft assessment in athymic nude mice fed high levels of LA exhibited similar increases in EGFR-Gab1 association and increased levels of pAkt, while mice fed with high levels of the omega-3 PUFA, docosahexaenoic acid (DHA; C22:6), demonstrated an opposite response. The involvement of Gab1 in LA-induced tumorigenesis was further defined utilizing murine cell lines that express high levels of Gab1. Significant increases in cell proliferation were observed with the addition of increasing concentrations of LA. However, no changes in cell proliferation were detected in the murine paired cell lines expressing little or no Gab1 protein, establishing Gab1 as major target in LA-induced enhancement of tumorigenesis.
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Affiliation(s)
- M. Mouradian
- Corresponding Author: Michael Mouradian University of Nevada, Reno 1664 N. Virginia St. MS330 Reno, NV 89557 775-784-6237 (Phone) 775-784-1419 (FAX)
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27
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Aasrum M, Ødegård J, Sandnes D, Christoffersen T. The involvement of the docking protein Gab1 in mitogenic signalling induced by EGF and HGF in rat hepatocytes. Biochim Biophys Acta 2013; 1833:3286-3294. [PMID: 24126105 DOI: 10.1016/j.bbamcr.2013.10.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [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: 07/05/2013] [Revised: 10/07/2013] [Accepted: 10/07/2013] [Indexed: 12/15/2022]
Abstract
Grb2-associated binder (Gab) family proteins are docking molecules that can interact with receptor tyrosine kinases (RTKs) and cytokine receptors and bind several downstream signalling proteins. Studies in several cell types have shown that Gab1 may have a role in signalling mediated by the two RTKs epidermal growth factor (EGF) receptor (EGFR) and Met, the receptor for hepatocyte growth factor (HGF), but the involvement of Gab1 in EGFR and Met signalling has not been directly compared in the same cell. We have studied mechanisms of activation and role in mitogenic signalling of Gab1 in response to EGF and HGF in cultured rat hepatocytes. Gab1, but not Gab2, was expressed in the hepatocytes and was phosphorylated upon stimulation with EGF or HGF. Depletion of Gab1, using siRNA, decreased the ERK and Akt activation, cyclin D1 expression, and DNA synthesis in response to both EGF and HGF. Studies of mechanisms of recruitment to the receptors showed that HGF induced co-precipitation of Gab1 and Met while EGF induced binding of Gab1 to Grb2 but not to EGFR. Gab1 activation in response to both EGF and HGF was dependent on PI3K. While EGF activated Gab1 and Shc equally, within the same concentration range, HGF very potently and almost exclusively activated Gab1, having only a minimal effect on Shc. Collectively, our results strongly suggest that although Gab1 interacts differently with EGFR and Met, it is involved in mitogenic signalling mediated by both these growth factor receptors in hepatocytes.
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Affiliation(s)
- Monica Aasrum
- Department of Pharmacology, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, P.O. Box 1057, Blindern, 0316 Oslo, Norway.
| | - John Ødegård
- Department of Pharmacology, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, P.O. Box 1057, Blindern, 0316 Oslo, Norway
| | - Dagny Sandnes
- Department of Pharmacology, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, P.O. Box 1057, Blindern, 0316 Oslo, Norway
| | - Thoralf Christoffersen
- Department of Pharmacology, Institute of Clinical Medicine, University of Oslo and Oslo University Hospital, P.O. Box 1057, Blindern, 0316 Oslo, Norway
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28
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Wolf A, Eulenfeld R, Gäbler K, Rolvering C, Haan S, Behrmann I, Denecke B, Haan C, Schaper F. JAK2-V617F-induced MAPK activity is regulated by PI3K and acts synergistically with PI3K on the proliferation of JAK2-V617F-positive cells. JAKSTAT 2013; 2:e24574. [PMID: 24069558 PMCID: PMC3772110 DOI: 10.4161/jkst.24574] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 04/05/2013] [Accepted: 04/05/2013] [Indexed: 02/07/2023] Open
Abstract
The identification of a constitutively active JAK2 mutant, namely JAK2-V617F, was a milestone in the understanding of Philadelphia chromosome-negative myeloproliferative neoplasms. The JAK2-V617F mutation confers cytokine hypersensitivity, constitutive activation of the JAK-STAT pathway, and cytokine-independent growth. In this study we investigated the mechanism of JAK2-V617F-dependent signaling with a special focus on the activation of the MAPK pathway. We observed JAK2-V617F-dependent deregulated activation of the multi-site docking protein Gab1 as indicated by constitutive, PI3K-dependent membrane localization and tyrosine phosphorylation of Gab1. Furthermore, we demonstrate that PI3K signaling regulates MAPK activation in JAK2-V617F-positve cells. This cross-regulation of the MAPK pathway by PI3K affects JAK2-V617F-specific target gene induction, erythroid colony formation, and regulates proliferation of JAK2-V617F-positive patient cells in a synergistically manner.
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Affiliation(s)
- Alexandra Wolf
- Department of Systems Biology; Institute of Biology; Otto-von-Guericke-University Magdeburg; Magdeburg, Germany ; Department of Biochemistry and Molecular Biology; RWTH-Aachen University; Aachen, Germany
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