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Molecular basis for integrin adhesion receptor binding to p21-activated kinase 4 (PAK4). Commun Biol 2022; 5:1257. [PMID: 36385162 PMCID: PMC9669019 DOI: 10.1038/s42003-022-04157-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 10/24/2022] [Indexed: 11/18/2022] Open
Abstract
AbstractIntegrin adhesion receptors provide links between extracellular ligands and cytoplasmic signaling. Multiple kinases have been found to directly engage with integrin β tails, but the molecular basis for these interactions remain unknown. Here, we assess the interaction between the kinase domain of p21-activated kinase 4 (PAK4) and the cytoplasmic tail of integrin β5. We determine three crystal structures of PAK4-β5 integrin complexes and identify the PAK-binding site. This is a region in the membrane-proximal half of the β5 tail and confirmed by site-directed mutagenesis. The β5 tail engages the kinase substrate-binding groove and positions the non-phosphorylatable integrin residue Glu767 at the phosphoacceptor site. Consistent with this, integrin β5 is poorly phosphorylated by PAK4, and in keeping with its ability to occlude the substrate-binding site, weakly inhibits kinase activity. These findings demonstrate the molecular basis for β5 integrin-PAK4 interactions but suggest modifications in understanding the potential cellular role of this interaction.
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ITGA5 Promotes Tumor Progression through the Activation of the FAK/AKT Signaling Pathway in Human Gastric Cancer. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:8611306. [PMID: 36193075 PMCID: PMC9526618 DOI: 10.1155/2022/8611306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/07/2022] [Accepted: 07/18/2022] [Indexed: 11/17/2022]
Abstract
Background ITGA5 is an adhesion molecule that integrates the intracellular structures with the extracellular matrix to perform biological functions. However, ITGA5 is highly expressed in a variety of tumors and is involved in tumor progression by promoting cell proliferation and metastasis. Nevertheless, little research has been performed on its function in gastric cancer. Therefore, the aim of this study was to investigate the role of ITGA5 in gastric cancer, focusing on the mechanism regulating the proliferation, invasion and migration. Methods The expression of ITGA5 in gastric cancer tissues was assessed by the use of molecular bioinformatics databases and high-throughput sequencing of gastric cancer tissues from patients. Western blot, qPCR, and immunohistochemistry were performed to detect the expression of ITGA5 in samples from gastric cancer patients and gastric cancer cell lines. Furthermore, the ITGA5 gene was silenced and overexpressed in gastric cancer cells, and the effect on proliferation, invasion, migration, and tumorigenic ability was assessed. Results ITGA5 mRNA and protein expression were upregulated in gastric cancer cell lines and tissues from patients, and its expression was closely associated with tumor size, lymph node metastasis, and TNM stage. In vitro and in vivo experiments showed that ITGA5 silencing resulted in the inhibition of proliferation, invasion, migration, and graft growth of gastric cancer cells; conversely, the overexpression resulted in the promotion of these cell functions. Our results finally showed that the effect of ITGA5 on proliferation, invasion, and migration of gastric cancer cells was performed through the activation of the FAK/AKT pathway. Conclusions ITGA5 promotes proliferation, invasion, and migration of gastric cancer cells through the activation of FAK/AKT signaling pathway, suggesting that ITGA5 may be potentially considered as a new target in gastric cancer therapy.
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Zhang Y, Su H, Wudu M, Ren H, Xu Y, Zhang Q, Jiang J, Wang Q, Jiang X, Zhang B, Liu Z, Zou Z, Qiu X. TBC1 domain family member 23 interacts with Ras-related protein Rab-11A to promote poor prognosis of non-small-cell lung cancer via β1-integrin. J Cell Mol Med 2021; 25:8821-8835. [PMID: 34363324 PMCID: PMC8435452 DOI: 10.1111/jcmm.16841] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Revised: 07/09/2021] [Accepted: 07/26/2021] [Indexed: 11/27/2022] Open
Abstract
Non‐small‐cell lung cancer (NSCLC) accounts for approximately 80% of lung cancer cases. TBC1D23, a member of the TBC/RABGAP family, is widely expressed in human tissues; however, its role in NSCLC is currently unknown. Immunohistochemical analysis was conducted on 173 paraffin‐embedded lung tissue sections from patients with NSCLC from 2014 to 2018 at the First Affiliated Hospital of China Medical University. MTT, colony formation assay, cell cycle assay, scratch assay, transwell assay, Western blotting and real‐time PCR were employed on multiple NSCLC cell lines modified to knock down or overexpress TBC1D23/RAB11A. Immunoprecipitation, immunoprecipitation‐mass spectrometry, immunofluorescence and flow cytometry were performed to explore the interaction between TBC1D23 and RAB11A and TBC1D23 involvement in the interaction between RAB11A and β1 integrin in the para‐nucleus. TBC1D23 was correlated with tumour size, differentiation degree, metastasis, TNM stage and poor prognosis. TBC1D23 was involved in the interaction between RAB11A and β1 integrin in the para‐nucleus, thus activating the β1 integrin/FAK/ERK signalling pathway to promote NSCLC. Furthermore, TBC1D23 promoted NSCLC progression by inducing cell proliferation, migration and invasion. This study indicated the relationship between TBC1D23 expression and the adverse clinicopathological characteristics of patients with NSCLC, suggesting that TBC1D23 may be an important target for NSCLC treatment.
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Affiliation(s)
- Yao Zhang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Hongbo Su
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Muli Wudu
- Department of Pathology, Basic Medical Sciences, Xinjiang Medical University, Urumqi, China
| | - Hongjiu Ren
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Yitong Xu
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Qingfu Zhang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Jun Jiang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Qiongzi Wang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Xizi Jiang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Bo Zhang
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
| | - Zongang Liu
- Department of Thoracic Surgery, The First Hospital of China Medical University, Shenyang, China
| | - Zifang Zou
- Department of Thoracic Surgery, Shengjing Hospital of China Medical University, Shenyang, China
| | - Xueshan Qiu
- Department of Pathology, First Affiliated Hospital College and of Basic Medical Sciences China Medical University, Shenyang, China
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Abstract
Group A rotaviruses (RVAs) are the major cause of severe acute gastroenteritis (AGE) in children under 5 years of age, annually resulting in nearly 130,000 deaths worldwide. Social conditions in developing countries that contribute to decreased oral rehydration and vaccine efficacy and the lack of approved antiviral drugs position RVA as a global health concern. In this minireview, we present an update in the field of antiviral compounds, mainly in relation to the latest findings in RVA virion structure and the viral replication cycle. In turn, we attempt to provide a perspective on the possible treatments for RVA-associated AGE, with special focus on novel approaches, such as those representing broad-spectrum therapeutic options. In this context, the modulation of host factors, lipid droplets, and the viral polymerase, which is highly conserved among AGE-causing viruses, are analyzed as possible drug targets.
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5
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Phosphorylation of Kindlins and the Control of Integrin Function. Cells 2021; 10:cells10040825. [PMID: 33916922 PMCID: PMC8067640 DOI: 10.3390/cells10040825] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 03/31/2021] [Accepted: 04/02/2021] [Indexed: 12/17/2022] Open
Abstract
Integrins serve as conduits for the transmission of information between cells and their extracellular environment. Signaling across integrins is bidirectional, transducing both inside-out and outside-signaling. Integrin activation, a transition from a low affinity/avidity state to a high affinity/avidity state for cognate ligands, is an outcome of inside-signaling. Such activation is particularly important for the recognition of soluble ligands by blood cells but also influences cell-cell and cell-matrix interactions. Integrin activation depends on a complex series of interactions, which both accelerate and inhibit their interconversion from the low to the high affinity/avidity state. There are three components regarded as being most proximately involved in integrin activation: the integrin cytoplasmic tails, talins and kindlins. The participation of each of these molecules in integrin activation is highly regulated by post-translation modifications. The importance of targeted phosphorylation of integrin cytoplasmic tails and talins in integrin activation is well-established, but much less is known about the role of post-translational modification of kindlins. The kindlins, a three-member family of 4.1-ezrin-radixin-moesin (FERM)-domain proteins in mammals, bind directly to the cytoplasmic tails of integrin beta subunits. This commentary provides a synopsis of the emerging evidence for the role of kindlin phosphorylation in integrin regulation.
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6
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Grimm TM, Dierdorf NI, Betz K, Paone C, Hauck CR. PPM1F controls integrin activity via a conserved phospho-switch. J Cell Biol 2020; 219:211512. [PMID: 33119040 PMCID: PMC7604772 DOI: 10.1083/jcb.202001057] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 07/20/2020] [Accepted: 09/11/2020] [Indexed: 01/04/2023] Open
Abstract
Control of integrin activity is vital during development and tissue homeostasis, while derailment of integrin function contributes to pathophysiological processes. Phosphorylation of a conserved threonine motif (T788/T789) in the integrin β cytoplasmic domain increases integrin activity. Here, we report that T788/T789 functions as a phospho-switch, which determines the association with either talin and kindlin-2, the major integrin activators, or filaminA, an integrin activity suppressor. A genetic screen identifies the phosphatase PPM1F as the critical enzyme, which selectively and directly dephosphorylates the T788/T789 motif. PPM1F-deficient cell lines show constitutive integrin phosphorylation, exaggerated talin binding, increased integrin activity, and enhanced cell adhesion. These gain-of-function phenotypes are reverted by reexpression of active PPM1F, but not a phosphatase-dead mutant. Disruption of the ppm1f gene in mice results in early embryonic death at day E10.5. Together, PPM1F controls the T788/T789 phospho-switch in the integrin β1 cytoplasmic tail and constitutes a novel target to modulate integrin activity.
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Affiliation(s)
- Tanja M. Grimm
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Nina I. Dierdorf
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Karin Betz
- Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany,Lehrstuhl Zelluläre Chemie, Fachbereich Chemie, Universität Konstanz, Konstanz, Germany
| | - Christoph Paone
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany
| | - Christof R. Hauck
- Lehrstuhl Zellbiologie, Fachbereich Biologie, Universität Konstanz, Konstanz, Germany,Konstanz Research School Chemical Biology, Universität Konstanz, Konstanz, Germany,Correspondence to Christof R. Hauck:
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7
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Kim B, Im NR, Yang TD, Kim J, Jung KY, Kim TH, Baek SK. Enhancement of aberrantly modified integrin‑mediated cell motility in multicellular tumor spheroids. Int J Oncol 2020; 56:1490-1498. [PMID: 32236635 DOI: 10.3892/ijo.2020.5016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Accepted: 01/29/2020] [Indexed: 11/05/2022] Open
Abstract
Multicellular tumor spheroids (MTSs) of malignant cells can display cell‑cell and cell‑matrix interactions, different from monolayer cultures. The objective of the present study was to examine difference in intercellular and cell‑matrix interaction between monolayered cultures and spheroid cultures. Expression levels of cell adhesion molecules (CAMs) and epithelial‑mesenchymal transition (EMT) signaling molecules in monolayered cells and MTS cells were compared. The motility of single cells dispersed from each culture was evaluated using a live‑cell imaging device. The effect of an E‑cadherin neutralizing antibody, DECMA, was also compared between the two cultures. Among various CAMs, only E‑cadherin was increased in MTSs. The motility of single cells dispersed from MTSs was higher than that from monolayered cells. Compared with monolayered cells, the molecular weight (MW) of β1 integrin was decreased during MTS formation, particularly during the early stage. This notable reduction was maintained when DECMA was used to treat MTSs. Additionally, the expression levels of the EMT signaling molecules Snail and ILK increased more in MTSs than in monolayered cells. The blocking of E‑cadherin elicited increased expression levels of EMT molecules and cellular motility only in MTSs. In conclusion, the alteration of E‑cadherin expression and presence of low‑MW β1 integrin in MTS may enhance cell motility via the upregulation of EMT signaling molecules that may be intensified by blocking E‑cadherin.
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Affiliation(s)
- Byoungjae Kim
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
| | - Nu-Ri Im
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
| | - Taeseok Daniel Yang
- School of Biomedical Engineering, Korea University, Seoul 136‑705, Republic of Korea
| | - Jian Kim
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
| | - Kwang-Yoon Jung
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
| | - Tae Hoon Kim
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
| | - Seung-Kuk Baek
- Department of Otolaryngology‑Head and Neck Surgery, College of Medicine, Korea University, Seoul 136‑705, Republic of Korea
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8
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Wei WC, Bianchi F, Wang YK, Tang MJ, Ye H, Glitsch MD. Coincidence Detection of Membrane Stretch and Extracellular pH by the Proton-Sensing Receptor OGR1 (GPR68). Curr Biol 2018; 28:3815-3823.e4. [PMID: 30471999 DOI: 10.1016/j.cub.2018.10.046] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Revised: 09/05/2018] [Accepted: 10/19/2018] [Indexed: 12/24/2022]
Abstract
The physical environment critically affects cell shape, proliferation, differentiation, and survival by exerting mechanical forces on cells. These forces are sensed and transduced into intracellular signals and responses by cells. A number of different membrane and cytoplasmic proteins have been implicated in sensing mechanical forces, but the picture is far from complete, and the exact transduction pathways remain largely elusive. Furthermore, mechanosensation takes place alongside chemosensation, and cells need to integrate physical and chemical signals to respond appropriately and ensure normal tissue and organ development and function. Here, we report that ovarian cancer G protein coupled receptor 1 (OGR1) (aka GPR68) acts as coincidence detector of membrane stretch and its physiological ligand, extracellular H+. Using fluorescence imaging, substrates of different stiffness, microcontact printing methods, and cell-stretching techniques, we show that OGR1 only responds to extracellular acidification under conditions of membrane stretch and vice versa. The level of OGR1 activity mirrors the extent of membrane stretch and degree of extracellular acidification. Furthermore, actin polymerization in response to membrane stretch is critical for OGR1 activity, and its depolymerization limits how long OGR1 remains responsive following a stretch event, thus providing a "memory" for past stretch. Cells experience changes in membrane stretch and extracellular pH throughout their lifetime. Because OGR1 is a widely expressed receptor, it represents a unique yet widespread mechanism that enables cells to respond dynamically to mechanical and pH changes in their microenvironment by integrating these chemical and physical stimuli at the receptor level.
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Affiliation(s)
- Wei-Chun Wei
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK
| | - Fabio Bianchi
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, UK
| | - Yang-Kao Wang
- Department of Cell Biology and Anatomy, College of Medicine, National Cheng Kung University, Tainan 70101, Taiwan
| | - Ming-Jer Tang
- Department of Physiology, College of Medicine and International Center for Wound Repair and Regeneration, National Cheng Kung University, Tainan 70101, Taiwan
| | - Hua Ye
- Institute of Biomedical Engineering, Department of Engineering Science, University of Oxford, Oxford OX3 7DQ, UK
| | - Maike D Glitsch
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3PT, UK.
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9
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Jahan F, Madhavan S, Rolova T, Viazmina L, Grönholm M, Gahmberg CG. Phosphorylation of the α-chain in the integrin LFA-1 enables β2-chain phosphorylation and α-actinin binding required for cell adhesion. J Biol Chem 2018; 293:12318-12330. [PMID: 29903913 DOI: 10.1074/jbc.ra118.004318] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 06/11/2018] [Indexed: 11/06/2022] Open
Abstract
The integrin leukocyte function-associated antigen-1 (LFA-1) plays a pivotal role in leukocyte adhesion and migration, but the mechanism(s) by which this integrin is regulated has remained incompletely understood. LFA-1 integrin activity requires phosphorylation of its β2-chain and interactions of its cytoplasmic tail with various cellular proteins. The α-chain is constitutively phosphorylated and necessary for cellular adhesion, but how the α-chain regulates adhesion has remained enigmatic. We now show that substitution of the α-chain phosphorylation site (S1140A) in T cells inhibits the phosphorylation of the functionally important Thr-758 in the β2-chain, binding of α-actinin and 14-3-3 protein, and expression of an integrin-activating epitope after treatment with the stromal cell-derived factor-1α. The presence of this substitution resulted in a loss of cell adhesion and directional cell migration. Moreover, LFA-1 activation through the T-cell receptor in cells expressing the S1140A LFA-1 variant resulted in less Thr-758 phosphorylation, α-actinin and talin binding, and cell adhesion. The finding that the LFA-1 α-chain regulates adhesion through the β-chain via specific phosphorylation at Ser-1140 in the α-chain has not been previously reported and emphasizes that both chains are involved in the regulation of LFA-1 integrin activity.
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Affiliation(s)
- Farhana Jahan
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Sudarrshan Madhavan
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Taisia Rolova
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Larisa Viazmina
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Mikaela Grönholm
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
| | - Carl G Gahmberg
- From the Faculty of Biological and Environmental Sciences, Molecular and Integrative Biosciences Research Program, University of Helsinki, Helsinki 00014 UH, Finland
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Wang R, Qi B, Dong YW, Cai QQ, Deng NH, Chen Q, Li C, Jin YT, Wu XZ. Sulfatide interacts with and activates integrin αVβ3 in human hepatocellular carcinoma cells. Oncotarget 2017; 7:36563-36576. [PMID: 27145276 PMCID: PMC5095021 DOI: 10.18632/oncotarget.9095] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 04/16/2016] [Indexed: 12/12/2022] Open
Abstract
Integrin αVβ3 is a malignant driver of anchorage-independence and tumor angiogenesis, but its dysregulation in hepatocellular carcinoma (HCC) remains unclear. In this study, we observed that sulfatide significantly promoted integrin αV(ITGAV) expression and wound closure in HCC. We also noted that elevated sulfatide profoundly stimulated integrin αVβ3 clustering and signaling. In the cells with integrin αVβ3 clustering induced by sulfatide, integrin β3 subunit was phosphorylated. Simultaneously, focal adhesion kinase (FAK), Src and paxillin were also phosphorylated. Treatment with FAK inhibitor resulted in robust suppression of FAK-Y397 and Src-Y416 phosphorylation stimulated by sulfatide, but not suppression of integrin β3 phosphorylation. Src inhibitors repressed Src-Y416 and FAK Y861 and Y925 phosphorylation, but not FAK-Y397 and integrin β3 phosphorylation. After mutation of integrin β3 (Y773F and Y785F), FAK or Src phosphorylation failed to be stimulated by sulfatide. Moreover, β3 Y773 and Y785 phosphorylation was suppressed by insulin-like growth factor receptor knockdown even in cells stimulated by sulfatide. In assays of immunoprecipitation and immunostaining with integrin αV or β3 antibody, labeled sulfatide was found in the complex and co-localized with integrin αVβ3. Taken together, this study demonstrated that elevated sulfatide bound to integrin αVβ3 and induced clustering and phosphorylation of αVβ3 instead of matrix ligand binding, triggering outside-in signaling.
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Affiliation(s)
- Rong Wang
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China.,Key Laboratory of Glycoconjugate Research, Ministry of Public Health, Shanghai, PR. China
| | - Bing Qi
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China.,Key Laboratory of Glycoconjugate Research, Ministry of Public Health, Shanghai, PR. China
| | - Yi Wei Dong
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China.,Key Laboratory of Glycoconjugate Research, Ministry of Public Health, Shanghai, PR. China
| | - Qian Qian Cai
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China.,Key Laboratory of Glycoconjugate Research, Ministry of Public Health, Shanghai, PR. China
| | - Nian Hui Deng
- Yu Ying Children's Hospital, Wenzhou Medical University, Wenzhou, PR. China
| | - Qi Chen
- Yu Ying Children's Hospital, Wenzhou Medical University, Wenzhou, PR. China
| | - Chao Li
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China
| | - Yu Tong Jin
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China
| | - Xing Zhong Wu
- Department of Biochemistry and Molecular Biology, School of Basic Medical Sciences, Fudan University, Shanghai, PR. China.,Key Laboratory of Glycoconjugate Research, Ministry of Public Health, Shanghai, PR. China
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11
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Uotila LM, Guenther C, Savinko T, Lehti TA, Fagerholm SC. Filamin A Regulates Neutrophil Adhesion, Production of Reactive Oxygen Species, and Neutrophil Extracellular Trap Release. THE JOURNAL OF IMMUNOLOGY 2017; 199:3644-3653. [PMID: 28986439 DOI: 10.4049/jimmunol.1700087] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Accepted: 09/11/2017] [Indexed: 12/26/2022]
Abstract
Neutrophils are of fundamental importance in the early immune response and use various mechanisms to neutralize invading pathogens. They kill endocytosed pathogens by releasing reactive oxygen species in the phagosome and release neutrophil extracellular traps (NETs) into their surroundings to immobilize and kill invading micro-organisms. Filamin A (FlnA) is an important actin cross-linking protein that is required for cellular processes involving actin rearrangements, such cell migration. It has also been shown to negatively regulate integrin activation and adhesion. However, its role in the regulation of β2 integrin-dependent adhesion, as well as in other cellular functions in neutrophils, is poorly understood. Using a transgenic mouse model in which FlnA is selectively depleted in myeloid cells, such as neutrophils, we show that FlnA negatively regulates β2 integrin adhesion to complement component iC3b and ICAM-1 in shear-free, but not shear-flow, conditions. FlnA deletion does not affect phagocytosis of Escherichia coli or Staphylococcus aureus or their intracellular killing. However, FlnA negatively regulates production of reactive oxygen species upon cell activation. Conversely, neutrophil activation through TLR4, as well as through activation by the Gram-negative bacteria E. coli, results in reduced NET production in FlnA-depleted neutrophils. Thus, FlnA is a negative regulator of β2 integrin-dependent cell adhesion and reactive oxygen species production but is required for NET production in primary murine neutrophils.
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Affiliation(s)
- Liisa M Uotila
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; and
| | - Carla Guenther
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; and
| | - Terhi Savinko
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; and
| | - Timo A Lehti
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; and
| | - Susanna C Fagerholm
- Faculty of Biological and Environmental Sciences, University of Helsinki, 00014 Helsinki, Finland; and .,Institute of Biotechnology, University of Helsinki, 00014 Helsinki, Finland
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12
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Chatterjee D, Zhiping LL, Tan SM, Bhattacharjya S. Interaction Analyses of the Integrin β2 Cytoplasmic Tail with the F3 FERM Domain of Talin and 14-3-3ζ Reveal a Ternary Complex with Phosphorylated Tail. J Mol Biol 2016; 428:4129-4142. [PMID: 27545410 DOI: 10.1016/j.jmb.2016.08.014] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 08/11/2016] [Accepted: 08/15/2016] [Indexed: 11/30/2022]
Abstract
Integrins, which are heterodimeric (α and β subunits) signal-transducer proteins, are essential for cell adhesion and migration. β cytosolic tails (β-CTs) of integrins interact with a number of cytosolic proteins including talin, Dok1, and 14-3-3ζ. The formation of multiprotein complexes with β-CTs is involved in the activation and regulation of integrins. The leukocyte-specific β2 integrins are essential for leukocyte trafficking, phagocytosis, antigen presentation, and proliferation. In this study, we examined the binding interactions between integrin β2-CT and T758-phosphorylated β2-CT with positive regulators talin and 14-3-3ζ and negative regulator Dok1. Residues of the F3 domain of talin belonging to the C-terminal helix, β-strand 5, and the adjacent loop were found to be involved in the binding interactions with β2-CT. The binding affinity between talin F3 and β2-CT was reduced when β2 T758 was phosphorylated, but this modification promoted 14-3-3ζ binding. However, we were able to detect stable ternary complex formation of T758-phosphorylated β2-CT, talin F3, and 14-3-3ζ that involved the repositioning of talin F3 on β2-CT. We showed that Dok1 binding to β2-CT was reduced in the presence of 14-3-3ζ and when β2 T758 was phosphorylated. Based on these data, we propose a sequential model of β2 integrin activation involving these molecules. Our study provides for the first time insights toward β2 integrin activation that involves a multiprotein complex.
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Affiliation(s)
- Deepak Chatterjee
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
| | - Lewis Lu Zhiping
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
| | - Suet-Mien Tan
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.
| | - Surajit Bhattacharjya
- School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore.
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Gao J, Gao P. Relationship between integrin and epithelial-mesenchymal transition during invasion and metastasis of digestive system carcinomas. Shijie Huaren Xiaohua Zazhi 2016; 24:3255-3261. [DOI: 10.11569/wcjd.v24.i21.3255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Invasion and metastasis are distinctive features of malignant tumors of the digestive system. Studies show that epithelial-mesenchymal transition (EMT), a conversion process with the loss of epithelial cell features and the gain of mesenchymal phenotype, has been recognized as a key element of invasion and metastasis of malignancies. When EMT occurs, down-regulation of E-cadherins and loss of adhesion in extracellular matrix play critical roles, which are regarded as important indicators in the assessment of EMT. Integrin, one of cell adhesion molecule families, is involved in EMT directly or indirectly through mediating either adhesion among cells and between cells and extracellular matrix, or signal pathways. This paper summarizes the relationship between EMT and integrin.
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