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Chew LA, Bellampalli SS, Dustrude ET, Khanna R. Mining the Na v1.7 interactome: Opportunities for chronic pain therapeutics. Biochem Pharmacol 2019; 163:9-20. [PMID: 30699328 DOI: 10.1016/j.bcp.2019.01.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Accepted: 01/24/2019] [Indexed: 12/14/2022]
Abstract
The peripherally expressed voltage-gated sodium NaV1.7 (gene SCN9A) channel boosts small stimuli to initiate firing of pain-signaling dorsal root ganglia (DRG) neurons and facilitates neurotransmitter release at the first synapse within the spinal cord. Mutations in SCN9A produce distinct human pain syndromes. Widely acknowledged as a "gatekeeper" of pain, NaV1.7 has been the focus of intense investigation but, to date, no NaV1.7-selective drugs have reached the clinic. Elegant crystallographic studies have demonstrated the potential of designing highly potent and selective NaV1.7 compounds but their therapeutic value remains untested. Transcriptional silencing of NaV1.7 by a naturally expressed antisense transcript has been reported in rodents and humans but whether this represents a viable opportunity for designing NaV1.7 therapeutics is currently unknown. The demonstration that loss of NaV1.7 function is associated with upregulation of endogenous opioids and potentiation of mu- and delta-opioid receptor activities, suggests that targeting only NaV1.7 may be insufficient for analgesia. However, the link between opioid-dependent analgesic mechanisms and function of sodium channels and intracellular sodium-dependent signaling remains controversial. Thus, additional new targets - regulators, modulators - are needed. In this context, we mine the literature for the known interactome of NaV1.7 with a focus on protein interactors that affect the channel's trafficking or link it to opioid signaling. As a case study, we present antinociceptive evidence of allosteric regulation of NaV1.7 by the cytosolic collapsin response mediator protein 2 (CRMP2). Throughout discussions of these possible new targets, we offer thoughts on the therapeutic implications of modulating NaV1.7 function in chronic pain.
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Affiliation(s)
- Lindsey A Chew
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Shreya S Bellampalli
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA
| | - Erik T Dustrude
- Stark Neurosciences Research Institute, Indiana University School of Medicine, Indianapolis, IN, USA; Department of Psychiatry, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Rajesh Khanna
- Department of Pharmacology, College of Medicine, University of Arizona, Tucson, AZ 85724, USA; Graduate Interdisciplinary Program in Neuroscience, College of Medicine, University of Arizona, Tucson, AZ, USA; The Center for Innovation in Brain Sciences, The University of Arizona Health Sciences, Tucson, AZ 85724, USA.
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Distinct expression profiles and functions of Kindlins in breast cancer. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2018; 37:281. [PMID: 30477537 PMCID: PMC6260766 DOI: 10.1186/s13046-018-0955-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 11/09/2018] [Indexed: 12/20/2022]
Abstract
Background Kindlin-1, − 2, and − 3 are the three members of the Kindlin family. They are best known as regulators of integrin functions, contributing to fundamental biological processes such as cell survival, adhesion and migration. Their deregulation leads to diverse pathologies including a broad range of cancers in which both, tumor-promoting and tumor-inhibiting functions have been described. Methods To better characterize Kindlins implication in breast cancer, in vitro experiments were performed in a series of cancer cell lines. We first assessed their expression profiles and subcellular distributions. Then, their involvement in breast cancer cell morphology, migration and invasion was verified by examining phenotypic changes induced by the depletion of either isoforms using RNA interference. An expression study was performed in a series of breast cancer patient derived xenografts (n = 58) to define the epithelial and stromal contribution of each Kindlin. Finally, we analyzed the expression levels of the three Kindlins in a large series of human breast tumors, at the RNA (n = 438) and protein (n = 129) levels and we evaluated their correlation with the clinical outcome. Results We determined that Kindlin-1 and Kindlin-2, but not Kindlin-3, were expressed in breast tumor cells. We uncovered the compensatory roles of Kindlin-1 and -2 in focal adhesion dynamics and cell motility. Remarkably, Kindlin-2 had a predominant effect on cell spreading and Kindlin-1 on cell invasion. In line with these experimental observations, Kindlin-1 overexpression was associated with a worse patients’ outcome. Notably, Kindlin-3, expressed by tumor infiltrating leukocytes, also correlated with a poor prognosis of breast cancer patients. Conclusion This study demonstrates that each one of the Kindlin family members has a different expression profile emphasizing their redundant and complementary roles in breast tumor cells. We highlight the specific link between Kindlin-1 and breast cancer progression. In addition, Kindlin-3 overexpression in the tumor microenvironment is associated with more aggressive breast tumors. These results suggest that Kindlins play distinctive roles in breast cancer. Kindlins may be useful in identifying breast cancer patients with a worst prognosis and may offer new avenues for therapeutic intervention against cancer progression. Electronic supplementary material The online version of this article (10.1186/s13046-018-0955-4) contains supplementary material, which is available to authorized users.
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Sahebekhtiari N, Fernandez-Guerra P, Nochi Z, Carlsen J, Bross P, Palmfeldt J. Deficiency of the mitochondrial sulfide regulator ETHE1 disturbs cell growth, glutathione level and causes proteome alterations outside mitochondria. Biochim Biophys Acta Mol Basis Dis 2018; 1865:126-135. [PMID: 30391543 DOI: 10.1016/j.bbadis.2018.10.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2018] [Revised: 10/14/2018] [Accepted: 10/30/2018] [Indexed: 01/15/2023]
Abstract
The mitochondrial enzyme ETHE1 is a persulfide dioxygenase essential for cellular sulfide detoxification, and its deficiency causes the severe and complex inherited metabolic disorder ethylmalonic encephalopathy (EE). In spite of well-described clinical symptoms of the disease, detailed cellular and molecular characterization is still ambiguous. Cellular redox regulation has been described to be influenced in ETHE1 deficient cells, and to clarify this further we applied image cytometry and detected decreased levels of reduced glutathione (GSH) in cultivated EE patient fibroblast cells. Cell growth initiation of the EE patient cells was impaired, whereas cell cycle regulation was not. Furthermore, Seahorse metabolic analyzes revealed decreased extracellular acidification, i. e. decreased lactate formation from glycolysis, in the EE patient cells. TMT-based large-scale proteomics was subsequently performed to broadly elucidate cellular consequences of the ETHE1 deficiency. More than 130 proteins were differentially regulated, of which the majority were non-mitochondrial. The proteomics data revealed a link between ETHE1-deficiency and down-regulation of several ribosomal proteins and LIM domain proteins important for cellular maintenance, and up-regulation of cell surface glycoproteins. Furthermore, several proteins of endoplasmic reticulum (ER) were perturbed including proteins influencing disulfide bond formation (e.g. protein disulfide isomerases and peroxiredoxin 4) and calcium-regulated proteins. The results indicate that decreased level of reduced GSH and alterations in proteins of ribosomes, ER and of cell adhesion lie behind the disrupted cell growth of the EE patient cells.
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Affiliation(s)
- Navid Sahebekhtiari
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Paula Fernandez-Guerra
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Zahra Nochi
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Jasper Carlsen
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Peter Bross
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark
| | - Johan Palmfeldt
- Research Unit for Molecular Medicine, Department of Clinical Medicine, Aarhus University and Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, DK-8200 Aarhus N, Denmark.
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Bai N, Peng E, Qiu X, Lyu N, Zhang Z, Tao Y, Li X, Wang Z. circFBLIM1 act as a ceRNA to promote hepatocellular cancer progression by sponging miR-346. JOURNAL OF EXPERIMENTAL & CLINICAL CANCER RESEARCH : CR 2018; 37:172. [PMID: 30053867 PMCID: PMC6062991 DOI: 10.1186/s13046-018-0838-8] [Citation(s) in RCA: 122] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 07/10/2018] [Indexed: 01/27/2023]
Abstract
BACKGROUD Accumulating evidences indicate that circular RNAs (circRNAs), a class of non-coding RNAs, play important roles in tumorigenesis. However, the function of circRNAs in hepatocellular cancer (HCC) is largely unknown. METHODS We performed circRNA microarrays to identify circRNAs that are aberrantly expressed in HCC tissues. Expression levels of a significantly upregulated circRNA, circFBLIM1, was detected by quantitative real-time PCR (qRT-PCR) in HCC cell lines and tissues. Then, we examined the functions of circFBLIM1 in HCC by cell proliferation, apoptosis, invasion and mouse xenograft assay. In addition, luciferase assay and RNA immunoprecipitation (RIP) assay were used to explore the miRNA sponge function of circFBLIM1 in HCC. RESULTS Microarray analysis and qRT-PCR verified a circRNA termed circFBLIM1 that was upregulated in HCC tissues and cell lines. Knockdown of circFBLIM1 inhibited proliferation, invasion and promoted apoptosis in HCC. Via luciferase reporter assays, circFBLIM1 and FBLIM1 were observed to directly bind to miR-346. Subsequent experiments showed that circFBLIM1 and FBLIM1 regulated the expression of each other by sponging miR-346. CONCLUSIONS Taken together, we conclude that circFBLIM1 may function as a competing endogenous RNA (ceRNA) to regulate FBLIM1 expression through sponging miR-346 to exert regulatory functions in HCC. circFBLIM1 may be a diagnostic biomarker and potential target for HCC therapy.
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Affiliation(s)
- Ning Bai
- Department of General Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Eming Peng
- Department of XIMC Outpatient, Xiangya Hospital, Central South University, Changsha, China
| | - Xingsheng Qiu
- Department of Radiation Oncology, Sun Yat-Sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Ning Lyu
- Department of Medical Imaging and Interventional Radiology, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Zhejia Zhang
- Department of General Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Yiming Tao
- Department of General Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Xinying Li
- Department of General Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China
| | - Zhiming Wang
- Department of General Surgery, Xiangya Hospital, Central South University, 87 Xiangya Road, Changsha, Hunan, 410008, People's Republic of China.
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Stylianou A, Gkretsi V, Stylianopoulos T. Transforming growth factor-β modulates pancreatic cancer associated fibroblasts cell shape, stiffness and invasion. Biochim Biophys Acta Gen Subj 2018; 1862:1537-1546. [PMID: 29477748 PMCID: PMC5957271 DOI: 10.1016/j.bbagen.2018.02.009] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2017] [Revised: 01/19/2018] [Accepted: 02/14/2018] [Indexed: 12/22/2022]
Abstract
BACKGROUND Tumor microenvironment consists of the extracellular matrix (ECM), stromal cells, such as fibroblasts (FBs) and cancer associated fibroblasts (CAFs), and a myriad of soluble factors. In many tumor types, including pancreatic tumors, the interplay between stromal cells and the other tumor microenvironment components leads to desmoplasia, a cancer-specific type of fibrosis that hinders treatment. Transforming growth factor beta (TGF-β) and CAFs are thought to play a crucial role in this tumor desmoplastic reaction, although the involved mechanisms are unknown. METHODS Optical/fluorescence microscopy, atomic force microscopy, image processing techniques, invasion assay in 3D collagen I gels and real-time PCR were employed to investigate the effect of TGF-β on normal pancreatic FBs and CAFs with regard to crucial cellular morphodynamic characteristics and relevant gene expression involved in tumor progression and metastasis. RESULTS CAFs present specific myofibroblast-like characteristics, such as α-smooth muscle actin expression and cell elongation, they also form more lamellipodia and are softer than FBs. TGF-β treatment increases cell stiffness (Young's modulus) of both FBs and CAFs and increases CAF's (but not FB's) elongation, cell spreading, lamellipodia formation and spheroid invasion. Gene expression analysis shows that these morphodynamic characteristics are mediated by Rac, RhoA and ROCK expression in CAFs treated with TGF-β. CONCLUSIONS TGF-β modulates CAFs', but not FBs', cell shape, stiffness and invasion. GENERAL SIGNIFICANCE Our findings elucidate on the effects of TGF-β on CAFs' behavior and stiffness providing new insights into the mechanisms involved.
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Affiliation(s)
- Andreas Stylianou
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 1678, Cyprus
| | - Vasiliki Gkretsi
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 1678, Cyprus
| | - Triantafyllos Stylianopoulos
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia 1678, Cyprus.
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Gkretsi V, Stylianopoulos T. Cell Adhesion and Matrix Stiffness: Coordinating Cancer Cell Invasion and Metastasis. Front Oncol 2018; 8:145. [PMID: 29780748 PMCID: PMC5945811 DOI: 10.3389/fonc.2018.00145] [Citation(s) in RCA: 243] [Impact Index Per Article: 40.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 04/20/2018] [Indexed: 01/27/2023] Open
Abstract
Metastasis is a multistep process in which tumor extracellular matrix (ECM) and cancer cell cytoskeleton interactions are pivotal. ECM is connected, through integrins, to the cell’s adhesome at cell–ECM adhesion sites and through them to the actin cytoskeleton and various downstream signaling pathways that enable the cell to respond to external stimuli in a coordinated manner. Cues from cell-adhesion proteins are fundamental for defining the invasive potential of cancer cells, and many of these proteins have been proposed as potent targets for inhibiting cancer cell invasion and thus, metastasis. In addition, ECM accumulation is quite frequent within the tumor microenvironment leading in many cases to an intense fibrotic response, known as desmoplasia, and tumor stiffening. Stiffening is not only required for the tumor to be able to displace the host tissue and grow in size but also contributes to cell–ECM interactions and can promote cancer cell invasion to surrounding tissues. Here, we review the role of cell adhesion and matrix stiffness in cancer cell invasion and metastasis.
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Affiliation(s)
- Vasiliki Gkretsi
- Department of Life Sciences, Biomedical Sciences Program, School of Sciences, European University Cyprus, Nicosia, Cyprus
| | - Triantafyllos Stylianopoulos
- Cancer Biophysics Laboratory, Department of Mechanical and Manufacturing Engineering, University of Cyprus, Nicosia, Cyprus
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Zhu D, Su Y, Zheng Y, Fu B, Tang L, Qin YX. Zinc regulates vascular endothelial cell activity through zinc-sensing receptor ZnR/GPR39. Am J Physiol Cell Physiol 2018; 314:C404-C414. [PMID: 29351417 PMCID: PMC5966790 DOI: 10.1152/ajpcell.00279.2017] [Citation(s) in RCA: 56] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 11/28/2017] [Accepted: 12/11/2017] [Indexed: 01/20/2023]
Abstract
Zn2+ is an essential element for cell survival/growth, and its deficiency is linked to many disorders. Extracellular Zn2+ concentration changes participate in modulating fundamental cellular processes such as proliferation, secretion, ion transport, and cell signal transduction in a mechanism that is not well understood. Here, we hypothesize that the Zn2+-sensing receptor ZnR/G protein-coupled receptor 39 (GPR39), found in tissues where dynamic Zn2+ homeostasis takes place, enables extracellular Zn2+ to trigger intracellular signaling pathways regulating key cell functions in vascular cells. Thus, we investigated how extracellular Zn2+ regulates cell viability, proliferation, motility, angiogenesis, vascular tone, and inflammation through ZnR/GPR39 in endothelial cells. Knockdown of GPR39 through siRNA largely abolished Zn2+-triggered cellular activity changes, Ca2+ responses, as well as the downstream activation of Gαq-PLC pathways. Extracellular Zn2+ promoted vascular cell survival/growth through activation of cAMP and Akt as well as overexpressing of platelet-derived growth factor-α receptor and vascular endothelial growth factor A. It also enhanced cell adhesion and mobility, endothelial tubule formation, and cytoskeletal reorganization. Such effects from extracellular Zn2+ were not observed in GPR39-/- endothelial cells. Zn2+ also regulated inflammation-related key molecules such as heme oxygenase-1, selectin L, IL-10, and platelet endothelial cell adhesion molecule 1, as well as vascular tone-related prostaglandin I2 synthase and nitric oxide synthase-3. In sum, extracellular Zn2+ regulates endothelial cell activity in a ZnR/GPR39-dependent manner and through the downstream Gαq-PLC pathways. Thus, ZnR/GPR39 may be a therapeutic target for regulating endothelial activity.
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Affiliation(s)
- Donghui Zhu
- Department of Biomedical Engineering, University of North Texas , Denton, Texas
| | - Yingchao Su
- Department of Biomedical Engineering, University of North Texas , Denton, Texas
| | - Yufeng Zheng
- Department of Materials Science and Engineering, College of Engineering, Peking University , Beijing , China
| | - Bingmei Fu
- Department of Biomedical Engineering, The City College of the City University of New York , New York, New York
| | - Liping Tang
- Department of Bioengineering, University of Texas at Arlington , Arlington, Texas
| | - Yi-Xian Qin
- Department of Biomedical Engineering, State University of New York at Stony Brook , Stony Brook, New York
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Zhan J, Zhang H. Kindlins: Roles in development and cancer progression. Int J Biochem Cell Biol 2018; 98:93-103. [PMID: 29544897 DOI: 10.1016/j.biocel.2018.03.008] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2017] [Revised: 03/09/2018] [Accepted: 03/12/2018] [Indexed: 12/15/2022]
Abstract
The Kindlins are FERM domain proteins comprising three members (Kindlin-1, -2 and -3) which are evolutionarily conserved. Kindlins bind with β-integrin cytoplasmic tails and execute broad biological functions including directed cell migration, proliferation, differentiation and survival. In light of more and more evidence point to the importance of Kindlin family members in normal development and human diseases especially in cancers, we aim to portrait the profile of Kindlins in the regulation of embryonic development and cancer progression. We first summarize all the known binding proteins for individual member of Kindlin family. We then outline the Kindlin-regulated signaling pathways including Wnt/β-catenin, TGFβ, EGFR, and Hedgehog signalings. Furthermore, we descript the pivotal role of Kindlins in embryonic development in detail with notions that Kindlin-1 is highly expressed in endo/ectodermal originated tissues, Kindlin-2 is highly expressed in mesoderm-derived tissues and Kindlin-3 is highly expressed in mesoderm- and ectoderm-derived tissues. Deregulation of Kindlins is generally reported in cancers from different organs. We also briefly descript the role of Kindlins in other diseases. Finally, we update the recent understanding of how Kindlins are regulated and modified as well as the degradation mechanism of Kindlins, respectively.
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Affiliation(s)
- Jun Zhan
- Peking University Health Science Center, Department of Anatomy, Histology and Embryology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), and State Key Laboratory of Natural and Biomimetic Drugs, Beijing 100191, China
| | - Hongquan Zhang
- Peking University Health Science Center, Department of Anatomy, Histology and Embryology, Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), and State Key Laboratory of Natural and Biomimetic Drugs, Beijing 100191, China.
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Apostolova LG, Risacher SL, Duran T, Stage EC, Goukasian N, West JD, Do TM, Grotts J, Wilhalme H, Nho K, Phillips M, Elashoff D, Saykin AJ. Associations of the Top 20 Alzheimer Disease Risk Variants With Brain Amyloidosis. JAMA Neurol 2018; 75:328-341. [PMID: 29340569 PMCID: PMC5885860 DOI: 10.1001/jamaneurol.2017.4198] [Citation(s) in RCA: 81] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Accepted: 10/19/2017] [Indexed: 01/28/2023]
Abstract
Importance Late-onset Alzheimer disease (AD) is highly heritable. Genome-wide association studies have identified more than 20 AD risk genes. The precise mechanism through which many of these genes are associated with AD remains unknown. Objective To investigate the association of the top 20 AD risk variants with brain amyloidosis. Design, Setting, and Participants This study analyzed the genetic and florbetapir F 18 data from 322 cognitively normal control individuals, 496 individuals with mild cognitive impairment, and 159 individuals with AD dementia who had genome-wide association studies and 18F-florbetapir positron emission tomographic data from the Alzheimer's Disease Neuroimaging Initiative (ADNI), a prospective, observational, multisite tertiary center clinical and biomarker study. This ongoing study began in 2005. Main Outcomes and Measures The study tested the association of AD risk allele carrier status (exposure) with florbetapir mean standard uptake value ratio (outcome) using stepwise multivariable linear regression while controlling for age, sex, and apolipoprotein E ε4 genotype. The study also reports on an exploratory 3-dimensional stepwise regression model using an unbiased voxelwise approach in Statistical Parametric Mapping 8 with cluster and significance thresholds at 50 voxels and uncorrected P < .01. Results This study included 977 participants (mean [SD] age, 74 [7.5] years; 535 [54.8%] male and 442 [45.2%] female) from the ADNI-1, ADNI-2, and ADNI-Grand Opportunity. The adenosine triphosphate-binding cassette subfamily A member 7 (ABCA7) gene had the strongest association with amyloid deposition (χ2 = 8.38, false discovery rate-corrected P < .001), after apolioprotein E ε4. Significant associations were found between ABCA7 in the asymptomatic and early symptomatic disease stages, suggesting an association with rapid amyloid accumulation. The fermitin family homolog 2 (FERMT2) gene had a stage-dependent association with brain amyloidosis (FERMT2 × diagnosis χ2 = 3.53, false discovery rate-corrected P = .05), which was most pronounced in the mild cognitive impairment stage. Conclusions and Relevance This study found an association of several AD risk variants with brain amyloidosis. The data also suggest that AD genes might differentially regulate AD pathologic findings across the disease stages.
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Affiliation(s)
- Liana G. Apostolova
- Department of Neurology, School of Medicine, Indiana University, Indianapolis
- Department of Radiology and Imaging Sciences, Center for Neuroimaging, School of Medicine, Indiana University, Indianapolis
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University, Indianapolis
| | - Shannon L. Risacher
- Department of Radiology and Imaging Sciences, Center for Neuroimaging, School of Medicine, Indiana University, Indianapolis
| | - Tugce Duran
- Department of Neurology, School of Medicine, Indiana University, Indianapolis
| | - Eddie C. Stage
- Department of Neurology, School of Medicine, Indiana University, Indianapolis
| | - Naira Goukasian
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - John D. West
- Department of Radiology and Imaging Sciences, Center for Neuroimaging, School of Medicine, Indiana University, Indianapolis
| | - Triet M. Do
- Department of Neurology, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Jonathan Grotts
- Department of Medicine Statistics Core, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Holly Wilhalme
- Department of Medicine Statistics Core, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Kwangsik Nho
- Department of Radiology and Imaging Sciences, Center for Neuroimaging, School of Medicine, Indiana University, Indianapolis
| | - Meredith Phillips
- Department of Neurology, School of Medicine, Indiana University, Indianapolis
| | - David Elashoff
- Department of Medicine Statistics Core, David Geffen School of Medicine at UCLA, Los Angeles, California
| | - Andrew J. Saykin
- Department of Radiology and Imaging Sciences, Center for Neuroimaging, School of Medicine, Indiana University, Indianapolis
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University, Indianapolis
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Guo L, Cai T, Chen K, Wang R, Wang J, Cui C, Yuan J, Zhang K, Liu Z, Deng Y, Xiao G, Wu C. Kindlin-2 regulates mesenchymal stem cell differentiation through control of YAP1/TAZ. J Cell Biol 2018; 217:1431-1451. [PMID: 29496737 PMCID: PMC5881491 DOI: 10.1083/jcb.201612177] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2016] [Revised: 10/22/2017] [Accepted: 12/27/2017] [Indexed: 12/22/2022] Open
Abstract
Mesenchymal stem cell (MSC) fate decision is strongly influenced by cell microenvironment. Guo et al. identify kindlin-2 as a key determinant of MSC lineage commitment and delineate a novel signaling pathway consisting of kindlin-2, RhoA, MLCK, AIP4, and YAP1/TAZ that senses mechanical cues of the cell microenvironment and controls MSC differentiation. Precise control of mesenchymal stem cell (MSC) differentiation is critical for tissue development and regeneration. We show here that kindlin-2 is a key determinant of MSC fate decision. Depletion of kindlin-2 in MSCs is sufficient to induce adipogenesis and inhibit osteogenesis in vitro and in vivo. Mechanistically, kindlin-2 regulates MSC differentiation through controlling YAP1/TAZ at both the transcript and protein levels. Kindlin-2 physically associates with myosin light-chain kinase in response to mechanical cues of cell microenvironment and intracellular signaling events and promotes myosin light-chain phosphorylation. Loss of kindlin-2 inhibits RhoA activation and reduces myosin light-chain phosphorylation, stress fiber formation, and focal adhesion assembly, resulting in increased Ser127 phosphorylation, nuclear exclusion, and ubiquitin ligase atrophin-1 interacting protein 4–mediated degradation of YAP1/TAZ. Our findings reveal a novel kindlin-2 signaling axis that senses the mechanical cues of cell microenvironment and controls MSC fate decision, and they suggest a new strategy to regulate MSC differentiation, tissue repair, and regeneration.
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Affiliation(s)
- Ling Guo
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Ting Cai
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Keng Chen
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Rong Wang
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Jiaxin Wang
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Chunhong Cui
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Jifan Yuan
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Kuo Zhang
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Zhongzhen Liu
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Yi Deng
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Guozhi Xiao
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China.,Department of Biochemistry, Rush University Medical Center, Chicago, IL
| | - Chuanyue Wu
- Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, and Department of Biology, Southern University of Science and Technology, Shenzhen, China .,Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA
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Wang X, Wei X, Yuan Y, Sun Q, Zhan J, Zhang J, Tang Y, Li F, Ding L, Ye Q, Zhang H. Src-mediated phosphorylation converts FHL1 from tumor suppressor to tumor promoter. J Cell Biol 2018; 217:1335-1351. [PMID: 29434030 PMCID: PMC5881501 DOI: 10.1083/jcb.201708064] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 12/19/2017] [Accepted: 01/16/2018] [Indexed: 02/07/2023] Open
Abstract
FHL1 has been recognized for a long time as a tumor suppressor protein that associates with both the actin cytoskeleton and the transcriptional machinery. We present in this study a paradigm that phosphorylated FHL1 functions as an oncogenic protein by promoting tumor cell proliferation. The cytosolic tyrosine kinase Src interacts with and phosphorylates FHL1 at Y149 and Y272, which switches FHL1 from a tumor suppressor to a cell growth accelerator. Phosphorylated FHL1 translocates into the nucleus, where it binds to the transcription factor BCLAF1 and promotes tumor cell growth. Importantly, the phosphorylation of FHL1 is increased in tissues from lung adenocarcinoma patients despite the down-regulation of total FHL1 expression. Kindlin-2 was found to interact with FHL1 and recruit FHL1 to focal adhesions. Kindlin-2 competes with Src for binding to FHL1 and suppresses Src-mediated FHL1 phosphorylation. Collectively, we demonstrate that FHL1 can either suppress or promote tumor cell growth depending on the status of the sites for phosphorylation by Src.
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Affiliation(s)
- Xiang Wang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Xiaofan Wei
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Yang Yuan
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Qingrui Sun
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Jun Zhan
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Jing Zhang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Yan Tang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Feng Li
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
| | - Lihua Ding
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, China
| | - Qinong Ye
- Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Collaborative Innovation Center for Cancer Medicine, Beijing, China
| | - Hongquan Zhang
- Key Laboratory of Carcinogenesis and Translational Research (Ministry of Education), Department of Human Anatomy, Histology and Embryology, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing, China
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63
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Migfilin promotes migration and invasion in glioma by driving EGFR and MMP-2 signalings: A positive feedback loop regulation. J Genet Genomics 2017; 44:557-565. [DOI: 10.1016/j.jgg.2017.09.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 09/04/2017] [Accepted: 09/17/2017] [Indexed: 11/21/2022]
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64
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Ishizuka K, Tabata H, Ito H, Kushima I, Noda M, Yoshimi A, Usami M, Watanabe K, Morikawa M, Uno Y, Okada T, Mori D, Aleksic B, Ozaki N, Nagata KI. Possible involvement of a cell adhesion molecule, Migfilin, in brain development and pathogenesis of autism spectrum disorders. J Neurosci Res 2017; 96:789-802. [PMID: 29114925 DOI: 10.1002/jnr.24194] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 10/06/2017] [Accepted: 10/09/2017] [Indexed: 11/07/2022]
Abstract
Migfilin, encoded by FBLIM1 at the 1p36 locus, is a multi-domain adaptor protein essential for various cellular processes such as cell morphology and migration. Small deletions and duplications at the 1p36 locus, monosomy of which results in neurodevelopmental disorders and multiple congenital anomalies, have also been identified in patients with autism spectrum disorder (ASD). However, the impact of FBLIM1, the gene within 1p36, on the pathogenesis of ASD is unknown. In this study, we performed morphological analyses of migfilin to elucidate its role in brain development. Migfilin was detected specifically in the embryonic and perinatal stages of the mouse brain. Either silencing or overexpression of migfilin in embryos following in utero electroporation disrupted Neocortical neuronal migration. Additionally, neurite elongation was impaired when migfilin was silenced in cultured mouse hippocampal neurons. We then screened FBLIM1 for rare exonic deletions/duplications in 549 Japanese ASD patients and 824 controls, detecting one case of ASD and intellectual delay that harbored a 26-kb deletion at 1p36.21 that solely included the C-terminal exon of FBLIM1. The FBLIM1 mRNA expression level in this case was reduced compared to levels in individuals without FBLIM1 deletion. Our findings indicate that tightly regulated expression of migfilin is essential for neuronal development and that FBLIM1 disruption may be related to the phenotypes associated with ASD and related neurodevelopmental disorders.
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Affiliation(s)
- Kanako Ishizuka
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hidenori Tabata
- Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Hidenori Ito
- Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Itaru Kushima
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Mariko Noda
- Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan
| | - Akira Yoshimi
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Masahide Usami
- Department of Child and Adolescent Psychiatry, Kohnodai Hospital, National Center for Global Health and Medicine, Ichikawa, Japan
| | - Kyota Watanabe
- Hiroshima City Center for Children's Health and Development, Hiroshima, Japan
| | - Mako Morikawa
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yota Uno
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Takashi Okada
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Daisuke Mori
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Branko Aleksic
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Norio Ozaki
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Koh-Ichi Nagata
- Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Japan.,Department of Neurochemistry, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Abstract
PURPOSE OF REVIEW Since the discovery of the lack of kindlin-3 expression as the reason for the immunopathology leukocyte adhesion deficiency III syndrome, the role of kindlin-3 in inflammatory processes was investigated in a numerous studies. This review gives an overview about recent findings regarding the role of kindlin-3 in neutrophil activation and recruitment. RECENT FINDINGS Kindlin-3, together with talin-1, contributes essentially to the activation of β2-integrins in neutrophils. During inside-out signaling, kindlin-3 binds to the β-cytoplasmic integrin tail and is indispensable for the integrin conformational shift into the high-affinity ligand binding conformation, but not for the intermediate (extended) conformation. During outside-in signaling (as a consequence of integrin ligand binding) kindlin-3 interacts with distinct signaling molecules and is required for cell-autonomous functions like migration and spreading. SUMMARY Leukocyte adhesion deficiency III syndrome, which is caused by absence of kindlin-3, is a rarely occurring disease. However, the investigation of the clinical symptoms as well as the underlying molecular mechanisms gave rise to a huge amount of new insights into the processes of integrin activation in neutrophils and the consequences of defects in these processes.
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66
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Sun Q, Xie N, Tang B, Li R, Shen Y. Alzheimer's Disease: From Genetic Variants to the Distinct Pathological Mechanisms. Front Mol Neurosci 2017; 10:319. [PMID: 29056900 PMCID: PMC5635057 DOI: 10.3389/fnmol.2017.00319] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/20/2017] [Indexed: 11/13/2022] Open
Abstract
Being the most common cause of dementia, AD is a polygenic and neurodegenerative disease. Complex and multiple factors have been shown to be involved in its pathogenesis, of which the genetics play an indispensable role. It is widely accepted that discovery of potential genes related to the pathogenesis of AD would be of great help for the understanding of neurodegeneration and thus further promote molecular diagnosis in clinic settings. Generally, AD could be clarified into two types according to the onset age, the early-onset AD (EOAD) and the late-onset AD (LOAD). Progresses made by genetic studies on both EOAD and LOAD are believed to be essential not only for the revolution of conventional ideas but also for the revelation of new pathological mechanisms underlying AD pathogenesis. Currently, albeit the genetics of LOAD is much less well-understood compared to EOAD due to its complicated and multifactorial essence, Genome-wide association studies (GWASs) and next generation sequencing (NGS) approaches have identified dozens of novel genes that may provide insight mechanism of LOAD. In this review, we analyze functions of the genes and summarize the distinct pathological mechanisms of how these genes would be involved in the pathogenesis of AD.
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Affiliation(s)
- Qiying Sun
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, China.,Center for Advanced Therapeutic Strategies for Brain Disorders and Center for Hormone Advanced Science and Education, Roskamp Institute, Sarasota, FL, United States
| | - Nina Xie
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Beisha Tang
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, China
| | - Rena Li
- Center for Advanced Therapeutic Strategies for Brain Disorders and Center for Hormone Advanced Science and Education, Roskamp Institute, Sarasota, FL, United States.,National Clinical Research Center for Mental Disorders, Beijing Key Laboratory of Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, China.,Beijing Institute for Brain Disorders, Capital Medical University, Beijing, China
| | - Yong Shen
- Department of Geriatric Neurology, Xiangya Hospital, Central South University, Changsha, China.,Center for Advanced Therapeutic Strategies for Brain Disorders and Center for Hormone Advanced Science and Education, Roskamp Institute, Sarasota, FL, United States.,Neurodegenerative Disorder Research Center, University of Science and Technology of China School of Life Sciences, Hefei, China.,Hefei Material Science at Microscale National Laboratory, Hefei, China
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67
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Gao J, Huang M, Lai J, Mao K, Sun P, Cao Z, Hu Y, Zhang Y, Schulte ML, Jin C, Wang J, White GC, Xu Z, Ma YQ. Kindlin supports platelet integrin αIIbβ3 activation by interacting with paxillin. J Cell Sci 2017; 130:3764-3775. [PMID: 28954813 DOI: 10.1242/jcs.205641] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 09/18/2017] [Indexed: 12/30/2022] Open
Abstract
Kindlins play an important role in supporting integrin activation by cooperating with talin; however, the mechanistic details remain unclear. Here, we show that kindlins interacted directly with paxillin and that this interaction could support integrin αIIbβ3 activation. An exposed loop in the N-terminal F0 subdomain of kindlins was involved in mediating the interaction. Disruption of kindlin binding to paxillin by structure-based mutations significantly impaired the function of kindlins in supporting integrin αIIbβ3 activation. Both kindlin and talin were required for paxillin to enhance integrin activation. Interestingly, a direct interaction between paxillin and the talin head domain was also detectable. Mechanistically, paxillin, together with kindlin, was able to promote the binding of the talin head domain to integrin, suggesting that paxillin complexes with kindlin and talin to strengthen integrin activation. Specifically, we observed that crosstalk between kindlin-3 and the paxillin family in mouse platelets was involved in supporting integrin αIIbβ3 activation and in vivo platelet thrombus formation. Taken together, our findings uncover a novel mechanism by which kindlin supports integrin αIIbβ3 activation, which might be beneficial for developing safer anti-thrombotic therapies.
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Affiliation(s)
- Juan Gao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Ming Huang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Jingjing Lai
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Kaijun Mao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Peisen Sun
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Zhongyuan Cao
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Youpei Hu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Yingying Zhang
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China
| | - Marie L Schulte
- Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA
| | - Chaozhi Jin
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences, Beijing 102206, China
| | - Jian Wang
- State Key Laboratory of Proteomics, Beijing Proteome Research Center, National Center for Protein Sciences, Beijing 102206, China
| | - Gilbert C White
- Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA.,Department of Biochemistry, Medical College of Milwaukee, Wisconsin, WI 53226, USA
| | - Zhen Xu
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China .,Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA
| | - Yan-Qing Ma
- Collaborative Research Program for Cell Adhesion Molecules, Shanghai University School of Life Sciences, Shanghai 200444, China .,Blood Research Institute, Blood Center of Wisconsin, Wisconsin, WI 53226, USA.,Department of Biochemistry, Medical College of Milwaukee, Wisconsin, WI 53226, USA
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68
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Acevedo LA, Greenwood AI, Nicholson LK. A Noncanonical Binding Site in the EVH1 Domain of Vasodilator-Stimulated Phosphoprotein Regulates Its Interactions with the Proline Rich Region of Zyxin. Biochemistry 2017; 56:4626-4636. [PMID: 28783324 DOI: 10.1021/acs.biochem.7b00618] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Vasodilator-stimulated phosphoprotein (VASP) is a processive actin polymerase with roles in the control of cell shape and cell migration. Through interaction with the cytoskeletal adaptor protein Zyxin, VASP can localize to damaged stress fibers where it serves to repair and reinforce these structures. VASP localization is mediated by its N-terminal Ena/VASP homology (EVH1) domain, which binds to the (W/F)PxφP motif (most commonly occurring as FPPPP) found in cytoskeletal proteins such as vinculin, lamellipodin, and Zyxin. Sequentially close clusters of four or five of these motifs frequently occur, as in the proline rich region of Zyxin with four such motifs. This suggests that tetrameric VASP might bind very tightly to Zyxin through avidity, with all four EVH1 domains binding to a single Zyxin molecule. Here, quantitative nuclear magnetic resonance titration analysis reveals a dominant bivalent 1:1 (Zyxin:EVH1) interaction between the Zyxin proline rich region and the VASP EVH1 domain that utilizes the EVH1 canonical binding site and a novel secondary binding site on the opposite face of the EVH1 domain. We further show that binding to the secondary binding site is specifically inhibited by mutation of VASP EVH1 domain residue Y39 to E, which mimics Abl-induced phosphorylation of Y39. On the basis of these findings, we propose a model in which phosphorylation of Y39 acts as a stoichiometry switch that governs binding partner selection by the constitutive VASP tetramer. These results have broader implications for other multivalent VASP EVH1 domain binding partners and for furthering our understanding of the role of Y39 phosphorylation in regulating VASP localization and cellular function.
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Affiliation(s)
- Lucila Andrea Acevedo
- Department of Molecular Biology and Genetics, Cornell University , Ithaca, New York 14853, United States
| | - Alexander I Greenwood
- Department of Applied Science, College of William and Mary , Williamsburg, Virginia 23185, United States
| | - Linda K Nicholson
- Department of Molecular Biology and Genetics, Cornell University , Ithaca, New York 14853, United States
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69
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Sun Y, Guo C, Ma P, Lai Y, Yang F, Cai J, Cheng Z, Zhang K, Liu Z, Tian Y, Sheng Y, Tian R, Deng Y, Xiao G, Wu C. Kindlin-2 Association with Rho GDP-Dissociation Inhibitor α Suppresses Rac1 Activation and Podocyte Injury. J Am Soc Nephrol 2017; 28:3545-3562. [PMID: 28775002 DOI: 10.1681/asn.2016091021] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 06/26/2017] [Indexed: 01/08/2023] Open
Abstract
Alteration of podocyte behavior is critically involved in the development and progression of many forms of human glomerular diseases. The molecular mechanisms that control podocyte behavior, however, are not well understood. Here, we investigated the role of Kindlin-2, a component of cell-matrix adhesions, in podocyte behavior in vivo Ablation of Kindlin-2 in podocytes resulted in alteration of actin cytoskeletal organization, reduction of the levels of slit diaphragm proteins, effacement of podocyte foot processes, and ultimately massive proteinuria and death due to kidney failure. Through proteomic analyses and in vitro coimmunoprecipitation experiments, we identified Rho GDP-dissociation inhibitor α (RhoGDIα) as a Kindlin-2-associated protein. Loss of Kindlin-2 in podocytes significantly reduced the expression of RhoGDIα and resulted in the dissociation of Rac1 from RhoGDIα, leading to Rac1 hyperactivation and increased motility of podocytes. Inhibition of Rac1 activation effectively suppressed podocyte motility and alleviated the podocyte defects and proteinuria induced by the loss of Kindlin-2 in vivo Our results identify a novel Kindlin-2-RhoGDIα-Rac1 signaling axis that is critical for regulation of podocyte structure and function in vivo and provide evidence that it may serve as a useful target for therapeutic control of podocyte injury and associated glomerular diseases.
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Affiliation(s)
- Ying Sun
- Departments of Biology and .,Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China
| | | | | | - Yumei Lai
- Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois; and
| | | | | | | | | | | | | | | | - Ruijun Tian
- Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China.,Chemistry, and
| | - Yi Deng
- Departments of Biology and.,Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China
| | - Guozhi Xiao
- Departments of Biology and .,Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China.,Department of Orthopedic Surgery, Rush University Medical Center, Chicago, Illinois; and
| | - Chuanyue Wu
- Departments of Biology and .,Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, China.,Department of Pathology, University of Pittsburgh, Pittsburgh, Pennsylvania
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70
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Dalghi MG, Ferreira-Gomes M, Montalbetti N, Simonin A, Strehler EE, Hediger MA, Rossi JP. Cortical cytoskeleton dynamics regulates plasma membrane calcium ATPase isoform-2 (PMCA2) activity. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2017; 1864:1413-1424. [DOI: 10.1016/j.bbamcr.2017.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2017] [Revised: 05/11/2017] [Accepted: 05/15/2017] [Indexed: 01/17/2023]
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71
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Nanoscale mechanobiology of cell adhesions. Semin Cell Dev Biol 2017; 71:53-67. [PMID: 28754443 DOI: 10.1016/j.semcdb.2017.07.029] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 07/17/2017] [Accepted: 07/19/2017] [Indexed: 12/16/2022]
Abstract
Proper physiological functions of cells and tissues depend upon their abilities to sense, transduce, integrate, and generate mechanical and biochemical signals. Although such mechanobiological phenomena are widely observed, the molecular mechanisms driving these outcomes are still not fully understood. Cell adhesions formed by integrins and cadherins receptors are key structures that process diverse sources of signals to elicit complex mechanobiological responses. Since the nanoscale is the length scale at which molecules interact to relay force and information, the understanding of cell adhesions at the nanoscale level is important for grasping the inner logics of cellular decision making. Until recently, the study of the biological nanoscale has been restricted by available molecular and imaging tools. Fortunately, rapid technological advances have increasingly opened up the nanoscale realm to systematic investigations. In this review, we discuss current insights and key open questions regarding the nanoscale structure and function relationship of cell adhesions, focusing on recent progresses in characterizing their composition, spatial organization, and cytomechanical operation.
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72
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Structural basis of kindlin-mediated integrin recognition and activation. Proc Natl Acad Sci U S A 2017; 114:9349-9354. [PMID: 28739949 DOI: 10.1073/pnas.1703064114] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Kindlins and talins are integrin-binding proteins that are critically involved in integrin activation, an essential process for many fundamental cellular activities including cell-matrix adhesion, migration, and proliferation. As FERM-domain-containing proteins, talins and kindlins, respectively, bind different regions of β-integrin cytoplasmic tails. However, compared with the extensively studied talin, little is known about how kindlins specifically interact with integrins and synergistically enhance their activation by talins. Here, we determined crystal structures of kindlin2 in the apo-form and the β1- and β3-integrin bound forms. The apo-structure shows an overall architecture distinct from talins. The complex structures reveal a unique integrin recognition mode of kindlins, which combines two binding motifs to provide specificity that is essential for integrin activation and signaling. Strikingly, our structures uncover an unexpected dimer formation of kindlins. Interrupting dimer formation impairs kindlin-mediated integrin activation. Collectively, the structural, biochemical, and cellular results provide mechanistic explanations that account for the effects of kindlins on integrin activation as well as for how kindlin mutations found in patients with Kindler syndrome and leukocyte-adhesion deficiency may impact integrin-mediated processes.
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73
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Bachir AI, Horwitz AR, Nelson WJ, Bianchini JM. Actin-Based Adhesion Modules Mediate Cell Interactions with the Extracellular Matrix and Neighboring Cells. Cold Spring Harb Perspect Biol 2017; 9:9/7/a023234. [PMID: 28679638 DOI: 10.1101/cshperspect.a023234] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Cell adhesions link cells to the extracellular matrix (ECM) and to each other and depend on interactions with the actin cytoskeleton. Both cell-ECM and cell-cell adhesion sites contain discrete, yet overlapping, functional modules. These modules establish physical associations with the actin cytoskeleton, locally modulate actin organization and dynamics, and trigger intracellular signaling pathways. Interplay between these modules generates distinct actin architectures that underlie different stages, types, and functions of cell-ECM and cell-cell adhesions. Actomyosin contractility is required to generate mature, stable adhesions, as well as to sense and translate the mechanical properties of the cellular environment into changes in cell organization and behavior. Here, we review the organization and function of different adhesion modules and how they interact with the actin cytoskeleton. We highlight the molecular mechanisms of mechanotransduction in adhesions and how adhesion molecules mediate cross talk between cell-ECM and cell-cell adhesion sites.
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Affiliation(s)
- Alexia I Bachir
- Protein and Cell Analysis, Biosciences Division, Thermo Fisher Scientific, Eugene, Oregon 97402
| | - Alan Rick Horwitz
- Protein and Cell Analysis, Biosciences Division, Thermo Fisher Scientific, Eugene, Oregon 97402
| | - W James Nelson
- Department of Cell Biology, University of Virginia, Charlottesville, Virginia 22903
| | - Julie M Bianchini
- Department of Cell Biology, University of Virginia, Charlottesville, Virginia 22903
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74
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Li M, Pei X, Wang G, Zhan J, Du J, Jiang H, Tang Y, Zhang H, He H. Kindlin-2 promotes clear cell renal cell carcinoma progression through the Wnt signaling pathway. Oncol Rep 2017; 38:1551-1560. [DOI: 10.3892/or.2017.5789] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 06/22/2017] [Indexed: 11/06/2022] Open
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75
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Cox AJ, Zhao Y, Ferguson PJ. Chronic Recurrent Multifocal Osteomyelitis and Related Diseases-Update on Pathogenesis. Curr Rheumatol Rep 2017; 19:18. [PMID: 28361334 PMCID: PMC5545929 DOI: 10.1007/s11926-017-0645-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
PURPOSE OF REVIEW We focus on recent advances in the understanding of the genetic, molecular, immunologic, and environmental factors implicated in the pathogenesis of autoinflammatory bone diseases including the syndromic and non-syndromic forms of chronic recurrent multifocal osteomyelitis (CRMO). RECENT FINDINGS Evidence implicating the IL-1 pathway in the pathogenesis of the Mendelian forms of CRMO is growing. LIPIN2 can regulate the NLRP3 inflammasome by affecting P2X7 receptor activation, and intracellular cholesterol can modulate P2X7R currents. Work in a mouse model of CRMO demonstrates that dietary manipulation can alter the microbiome and protect these mice from the development of sterile osteomyelitis in vivo. Although the genetic and immunologic basis of non-syndromic CRMO remains only partially understood, the IL-1 pathway is central to the pathogenesis in the syndromic autoinflammatory bone disorders. Recent work implicates lipids and the microbiome in sterile osteomyelitis.
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Affiliation(s)
- Allison J Cox
- Department of Pediatrics and the Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA, USA
| | - Yongdong Zhao
- Pediatric Rheumatology, Department of Pediatrics, Seattle Children's Hospital, University of Washington, Seattle, WA, USA
| | - Polly J Ferguson
- Department of Pediatrics and the Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA, USA.
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76
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Cox AJ, Darbro BW, Laxer RM, Velez G, Bing X, Finer AL, Erives A, Mahajan VB, Bassuk AG, Ferguson PJ. Recessive coding and regulatory mutations in FBLIM1 underlie the pathogenesis of chronic recurrent multifocal osteomyelitis (CRMO). PLoS One 2017; 12:e0169687. [PMID: 28301468 PMCID: PMC5354242 DOI: 10.1371/journal.pone.0169687] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Accepted: 12/19/2016] [Indexed: 12/20/2022] Open
Abstract
Chronic recurrent multifocal osteomyelitis (CRMO) is a rare, pediatric, autoinflammatory disease characterized by bone pain due to sterile osteomyelitis, and is often accompanied by psoriasis or inflammatory bowel disease. There are two syndromic forms of CRMO, Majeed syndrome and DIRA, for which the genetic cause is known. However, for the majority of cases of CRMO, the genetic basis is unknown. Via whole-exome sequencing, we detected a homozygous mutation in the filamin-binding domain of FBLIM1 in an affected child with consanguineous parents. Microarray analysis of bone marrow macrophages from the CRMO murine model (cmo) determined that the Fblim1 ortholog is the most differentially expressed gene, downregulated over 20-fold in the cmo mouse. We sequenced FBLIM1 in 96 CRMO subjects and found a second proband with a novel frameshift mutation in exon 6 and a rare regulatory variant. In SaOS2 cells, overexpressing the regulatory mutation showed the flanking region acts as an enhancer, and the mutation ablates enhancer activity. Our data implicate FBLIM1 in the pathogenesis of sterile bone inflammation and our findings suggest CRMO is a disorder of chronic inflammation and imbalanced bone remodeling.
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Affiliation(s)
- Allison J. Cox
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Graduate Program in Genetics, The University of Iowa, Iowa City, IA, United States of America
| | - Benjamin W. Darbro
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Graduate Program in Genetics, The University of Iowa, Iowa City, IA, United States of America
| | - Ronald M. Laxer
- Division of Pediatric Rheumatology, Departments of Pediatrics and Medicine, University of Toronto and The Hospital for Sick Children, Toronto, ON, Canada
| | - Gabriel Velez
- Medical Scientist Training Program, University of Iowa, Iowa City, IA, United States of America
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, IA, United States of America
- Omics Laboratory, University of Iowa, Iowa City, IA, United States of America
| | - Xinyu Bing
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
| | - Alexis L. Finer
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
| | - Albert Erives
- Interdisciplinary Graduate Program in Genetics, The University of Iowa, Iowa City, IA, United States of America
- Department of Biology, The University of Iowa, Iowa City, IA, United States of America
| | - Vinit B. Mahajan
- Department of Ophthalmology and Visual Sciences, The University of Iowa, Iowa City, IA, United States of America
- Omics Laboratory, University of Iowa, Iowa City, IA, United States of America
| | - Alexander G. Bassuk
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Graduate Program in Genetics, The University of Iowa, Iowa City, IA, United States of America
| | - Polly J. Ferguson
- Department of Pediatrics, The University of Iowa, Iowa City, IA, United States of America
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77
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Shen C, Sun L, Zhu N, Qi F. Kindlin-1 contributes to EGF-induced re-epithelialization in skin wound healing. Int J Mol Med 2017; 39:949-959. [PMID: 28290610 PMCID: PMC5360437 DOI: 10.3892/ijmm.2017.2911] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 02/21/2017] [Indexed: 02/04/2023] Open
Abstract
The commercial use of epidermal growth factor (EGF) is extensive and has been shown to be effective for skin wound healing in clinical practice. There is evidence to indicate that the topical administration of EGF significantly accelerates re-epithelialization by promoting keratinocyte mitogenesis and migration following acute injury; however, the mechanisms involved remain to be elucidated. Thus, in this study, we focused on Kindlin-1, a four-point-one, ezrin, radixin, moesin (FERM)-domain-containing adaptor protein, and report its contribution to EGF-induced re-epithelialization in skin wound healing. In tissue samples, the expression of Kindlin-1 was induced upon EGF treatment compared to that in the natural healing group. In immortalized human keratinocytes (HaCaT cells), we further proved that Kindlin-1 was necessary for mediating EGF-induced activation signals, including integrin β1 activation, focal adhesion kinase (FAK) phosphorylation and actin re-organization, which finally led to enhanced cell proliferation and migration. These results indicate that Kindlin-1 is essential in EGF-induced re-epithelialization in skin wound healing and provide additional rationale for the clinical application of EGF in the treatment of acute wounds.
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Affiliation(s)
- Congcong Shen
- Department of Plastic Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
| | - Linlin Sun
- Department of Biochemistry and Molecular Biology, Basic Medical College of Fudan University, Shanghai 200032, P.R. China
| | - Ningwen Zhu
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai 200040, P.R. China
| | - Fazhi Qi
- Department of Plastic Surgery, Zhongshan Hospital, Fudan University, Shanghai 200032, P.R. China
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78
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Pergola C, Schubert K, Pace S, Ziereisen J, Nikels F, Scherer O, Hüttel S, Zahler S, Vollmar AM, Weinigel C, Rummler S, Müller R, Raasch M, Mosig A, Koeberle A, Werz O. Modulation of actin dynamics as potential macrophage subtype-targeting anti-tumour strategy. Sci Rep 2017; 7:41434. [PMID: 28134280 PMCID: PMC5278352 DOI: 10.1038/srep41434] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 12/19/2016] [Indexed: 12/27/2022] Open
Abstract
Tumour-associated macrophages mainly comprise immunosuppressive M2 phenotypes that promote tumour progression besides anti-tumoural M1 subsets. Selective depletion or reprogramming of M2 may represent an innovative anti-cancer strategy. The actin cytoskeleton is central for cellular homeostasis and is targeted for anti-cancer chemotherapy. Here, we show that targeting G-actin nucleation using chondramide A (ChA) predominantly depletes human M2 while promoting the tumour-suppressive M1 phenotype. ChA reduced the viability of M2, with minor effects on M1, but increased tumour necrosis factor (TNF)α release from M1. Interestingly, ChA caused rapid disruption of dynamic F-actin filaments and polymerization of G-actin, followed by reduction of cell size, binucleation and cell division, without cellular collapse. In M1, but not in M2, ChA caused marked activation of SAPK/JNK and NFκB, with slight or no effects on Akt, STAT-1/-3, ERK-1/2, and p38 MAPK, seemingly accounting for the better survival of M1 and TNFα secretion. In a microfluidically-supported human tumour biochip model, circulating ChA-treated M1 markedly reduced tumour cell viability through enhanced release of TNFα. Together, ChA may cause an anti-tumoural microenvironment by depletion of M2 and activation of M1, suggesting induction of G-actin nucleation as potential strategy to target tumour-associated macrophages in addition to neoplastic cells.
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Affiliation(s)
- Carlo Pergola
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Katrin Schubert
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Simona Pace
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Jana Ziereisen
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Felix Nikels
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Olga Scherer
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Stephan Hüttel
- Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Saarbrücken, Germany.,Helmholtz Centre for Infection Research and Pharmaceutical Biotechnology at Saarland University, Saarbrücken, Germany
| | - Stefan Zahler
- Department of Pharmacy, Pharmaceutical Biology, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Angelika M Vollmar
- Department of Pharmacy, Pharmaceutical Biology, Ludwig-Maximilians-University, 81377 Munich, Germany
| | - Christina Weinigel
- Institute of Transfusion Medicine, University Hospital Jena, Jena, Germany
| | - Silke Rummler
- Institute of Transfusion Medicine, University Hospital Jena, Jena, Germany
| | - Rolf Müller
- Helmholtz-Institute for Pharmaceutical Research Saarland (HIPS), Saarbrücken, Germany.,Helmholtz Centre for Infection Research and Pharmaceutical Biotechnology at Saarland University, Saarbrücken, Germany
| | - Martin Raasch
- Institute of Biochemistry II, University Hospital Jena, Jena, Germany
| | - Alexander Mosig
- Institute of Biochemistry II, University Hospital Jena, Jena, Germany
| | - Andreas Koeberle
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
| | - Oliver Werz
- Chair of Pharmaceutical/Medicinal Chemistry, Institute of Pharmacy, Friedrich-Schiller-University, Jena, Germany
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79
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Rognoni E, Ruppert R, Fässler R. The kindlin family: functions, signaling properties and implications for human disease. J Cell Sci 2016; 129:17-27. [PMID: 26729028 DOI: 10.1242/jcs.161190] [Citation(s) in RCA: 157] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
The kindlin (or fermitin) family of proteins comprises three members (kindlin-1,-2 and -3) of evolutionarily conserved focal adhesion (FA) proteins, whose best-known task is to increase integrin affinity for a ligand (also referred as integrin activation) through binding of β-integrin tails. The consequence of kindlin-mediated integrin activation and integrin-ligand binding is cell adhesion, spreading and migration, assembly of the extracellular matrix (ECM), cell survival, proliferation and differentiation. Another hallmark of kindlins is their involvement in disease. Mutations in the KINDLIN-1 (also known as FERMT1) gene cause Kindler syndrome (KS)--in which mainly skin and intestine are affected, whereas mutations in the KINDLIN-3 (also known as FERMT3) gene cause leukocyte adhesion deficiency type III (LAD III), which is characterized by impaired extravasation of blood effector cells and severe, spontaneous bleedings. Also, aberrant expression of kindlins in various forms of cancer and in tissue fibrosis has been reported. Although the malfunctioning of integrins represent a major cause leading to kindlin-associated diseases, increasing evidence also point to integrin-independent functions of kindlins that play an important role in the pathogenesis of certain disease aspects. Furthermore, isoform-specific kindlin functions have been discovered, explaining, for example, why loss of kindlins differentially affects tissue stem cell homeostasis or tumor development. This Commentary focuses on new and isoform-specific kindlin functions in different tissues and discusses their potential role in disease development and progression.
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Affiliation(s)
- Emanuel Rognoni
- Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Raphael Ruppert
- Max Planck Institute of Biochemistry, Martinsried 82152, Germany
| | - Reinhard Fässler
- Max Planck Institute of Biochemistry, Martinsried 82152, Germany
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80
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Abstract
Genetic studies of hereditary forms of nephrotic syndrome have identified several proteins that are involved in regulating the permselective properties of the glomerular filtration system. Further extensive research has elucidated the complex molecular basis of the glomerular filtration barrier and clearly established the pivotal role of podocytes in the pathophysiology of glomerular diseases. Podocyte architecture is centred on focal adhesions and slit diaphragms - multiprotein signalling hubs that regulate cell morphology and function. A highly interconnected actin cytoskeleton enables podocytes to adapt in order to accommodate environmental changes and maintain an intact glomerular filtration barrier. Actin-based endocytosis has now emerged as a regulator of podocyte integrity, providing an impetus for understanding the precise mechanisms that underlie the steady-state control of focal adhesion and slit diaphragm components. This Review outlines the role of actin dynamics and endocytosis in podocyte biology, and discusses how molecular heterogeneity in glomerular disorders could be exploited to deliver more rational therapeutic interventions, paving the way for targeted medicine in nephrology.
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81
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Yan M, Zhang L, Wu Y, Gao L, Yang W, Li J, Chen Y, Jin X. Increased expression of kindlin-2 is correlated with hematogenous metastasis and poor prognosis in patients with clear cell renal cell carcinoma. FEBS Open Bio 2016; 6:660-5. [PMID: 27398306 PMCID: PMC4932446 DOI: 10.1002/2211-5463.12063] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 04/04/2016] [Accepted: 04/05/2016] [Indexed: 12/23/2022] Open
Abstract
Kindlin‐2 is involved in activating the integrin signaling pathway which plays an important role in regulating cancer cell invasion. However, the role of kindlin‐2 may vary among cancer types. The aim of this study was to explore the possible association between kindlin‐2 and clear cell renal cell carcinoma (ccRCC), and its potential role in the prognosis of ccRCC. Immunohistochemistry assays were used to examine kindlin‐2 expression levels in cancer tissues obtained from 336 patients with ccRCC. The correlation between kindlin‐2 expression levels and pathologic variables was then analyzed. In addition, the association between kindlin‐2 expression levels and survival time was analyzed by Kaplan–Meier survival curves and log‐rank tests. Of 336 ccRCC patients, 199 had high levels of kindlin‐2 expression, while 137 had low kindlin‐2 expression levels. Patients at a late stage of ccRCC (stage III or IV) were more likely to have high kindlin‐2 expression levels than those at an early stage (stage I or II) (χ2 = 4.72, P = 0.03). Patients with high levels of kindlin‐2 expression had higher risk of hematogenous metastasis (χ2 = 6.70, P = 0.01) than those with low levels of kindlin‐2 expression. In addition, the survival time was significantly shorter for patients with high levels of kindlin‐2 expression than for those with low levels of kindlin‐2 expression (P = 0.001 for overall survival [OS] and P = 0.002 for disease‐free survival [DFS]). Multivariate survival analysis based on the Cox proportional hazards model showed that high kindlin‐2 expression levels had a hazard risk (HR) of 1.76 for OS (95% CI 1.19–2.62, P = 0.005) and an HR of 1.47 for DFS (95% CI = 1.05–2.06, P = 0.026). By comparison, lymph node metastasis had an HR of 1.48 for OS (95% CI 1.04–2.10, P = 0.029) and an HR of 1.41 for DFS (95% CI 1.04–1.93, P = 0.029). This study provided strong evidence that increased kindlin‐2 expression might be involved in promoting tumor invasiveness and leading to a poor prognosis of ccRCC.
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Affiliation(s)
- Meisi Yan
- Department of Pathology Harbin Medical University China
| | - Lei Zhang
- Department of Pathology Harbin Medical University China
| | - Yiqi Wu
- Department of Pathology Harbin Medical University China
| | - Lei Gao
- Electron Microscopy Centre Harbin Medical University China
| | - Weiwei Yang
- Department of Pathology Harbin Medical University China
| | - Jing Li
- Electron Microscopy Centre Harbin Medical University China
| | - Yubing Chen
- Department of Radiotherapy Second Hospital of Jilin University Changchun China
| | - Xiaoming Jin
- Department of Pathology Harbin Medical University China
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82
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Phosphatidylinositol 3-Kinase/Akt Mediates Integrin Signaling To Control RNA Polymerase I Transcriptional Activity. Mol Cell Biol 2016; 36:1555-68. [PMID: 26976639 DOI: 10.1128/mcb.00004-16] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Accepted: 03/04/2016] [Indexed: 12/11/2022] Open
Abstract
RNA polymerase I-mediated rRNA production is a key determinant of cell growth. Despite extensive studies, the signaling pathways that control RNA polymerase I-mediated rRNA production are not well understood. Here we provide original evidence showing that RNA polymerase I transcriptional activity is tightly controlled by integrin signaling. Furthermore, we show that a signaling axis consisting of focal adhesion kinase (FAK), Src, phosphatidylinositol 3-kinase (PI3K), Akt, and mTOR mediates the effect of integrin signaling on rRNA transcription. Additionally, we show that in kindlin-2 knockout mouse embryonic fibroblasts, overactivation of Ras, Akt, and Src can successfully rescue the defective RNA polymerase I activity induced by the loss of kindlin-2. Finally, through experiments with inhibitors of FAK, Src, and PI3K and rescue experiments in MEFs, we found that the FAK/Src/PI3K/Akt signaling pathway to control rRNA transcription is linear. Collectively, these studies reveal, for the first time, a pivotal role of integrin signaling in regulation of RNA polymerase I transcriptional activity and shed light on the downstream signaling axis that participates in regulation of this key aspect of cell growth.
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83
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Bledzka K, Bialkowska K, Sossey-Alaoui K, Vaynberg J, Pluskota E, Qin J, Plow EF. Kindlin-2 directly binds actin and regulates integrin outside-in signaling. J Cell Biol 2016; 213:97-108. [PMID: 27044892 PMCID: PMC4828686 DOI: 10.1083/jcb.201501006] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2015] [Accepted: 02/22/2016] [Indexed: 02/07/2023] Open
Abstract
Bledzka et al. show that kindlin-2 binds actin via its F0 domain, and mutation of this site diminishes cell spreading, revealing a new mechanism by which kindlin-2 regulates cellular responses. Reduced levels of kindlin-2 (K2) in endothelial cells derived from K2+/− mice or C2C12 myoblastoid cells treated with K2 siRNA showed disorganization of their actin cytoskeleton and decreased spreading. These marked changes led us to examine direct binding between K2 and actin. Purified K2 interacts with F-actin in cosedimentation and surface plasmon resonance analyses and induces actin aggregation. We further find that the F0 domain of K2 binds actin. A mutation, LK47/AA, within a predicted actin binding site (ABS) of F0 diminishes its interaction with actin by approximately fivefold. Wild-type K2 and K2 bearing the LK47/AA mutation were equivalent in their ability to coactivate integrin αIIbβ3 in a CHO cell system when coexpressed with talin. However, K2-LK47/AA exhibited a diminished ability to support cell spreading and actin organization compared with wild-type K2. The presence of an ABS in F0 of K2 that influences outside-in signaling across integrins establishes a new foundation for considering how kindlins might regulate cellular responses.
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Affiliation(s)
- Kamila Bledzka
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Katarzyna Bialkowska
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Khalid Sossey-Alaoui
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Julia Vaynberg
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Elzbieta Pluskota
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Jun Qin
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
| | - Edward F Plow
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195
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84
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Yang JR, Pan TJ, Yang H, Wang T, Liu W, Liu B, Qian WH. Kindlin-2 promotes invasiveness of prostate cancer cells via NF-κB-dependent upregulation of matrix metalloproteinases. Gene 2016; 576:571-6. [DOI: 10.1016/j.gene.2015.11.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 07/28/2015] [Accepted: 11/04/2015] [Indexed: 12/27/2022]
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85
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Chevalier B, Adamiok A, Mercey O, Revinski DR, Zaragosi LE, Pasini A, Kodjabachian L, Barbry P, Marcet B. miR-34/449 control apical actin network formation during multiciliogenesis through small GTPase pathways. Nat Commun 2015; 6:8386. [PMID: 26381333 PMCID: PMC4595761 DOI: 10.1038/ncomms9386] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 08/17/2015] [Indexed: 12/13/2022] Open
Abstract
Vertebrate multiciliated cells (MCCs) contribute to fluid propulsion in several biological processes. We previously showed that microRNAs of the miR-34/449 family trigger MCC differentiation by repressing cell cycle genes and the Notch pathway. Here, using human and Xenopus MCCs, we show that beyond this initial step, miR-34/449 later promote the assembly of an apical actin network, required for proper basal bodies anchoring. Identification of miR-34/449 targets related to small GTPase pathways led us to characterize R-Ras as a key regulator of this process. Protection of RRAS messenger RNA against miR-34/449 binding impairs actin cap formation and multiciliogenesis, despite a still active RhoA. We propose that miR-34/449 also promote relocalization of the actin binding protein Filamin-A, a known RRAS interactor, near basal bodies in MCCs. Our study illustrates the intricate role played by miR-34/449 in coordinating several steps of a complex differentiation programme by regulating distinct signalling pathways. MicroRNAs of the miR-34/449 family initiate formation of multiciliated cells through the suppression of cell cycle genes and Notch. Here the authors show that miR-34/449 also regulate the assembly of an apical actin network necessary for basal body anchoring by regulating the expression of R-Ras.
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Affiliation(s)
- Benoît Chevalier
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR-7275, 660 route des Lucioles, 06560 Sophia-Antipolis, France.,University of Nice-Sophia-Antipolis (UNS), Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des Lucioles, Valbonne, 06560 Sophia-Antipolis, France
| | - Anna Adamiok
- Aix-Marseille Université, CNRS, UMR7288, Institut de Biologie du Développement de Marseille (IBDM), 13288 Marseille, France
| | - Olivier Mercey
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR-7275, 660 route des Lucioles, 06560 Sophia-Antipolis, France.,University of Nice-Sophia-Antipolis (UNS), Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des Lucioles, Valbonne, 06560 Sophia-Antipolis, France
| | - Diego R Revinski
- Aix-Marseille Université, CNRS, UMR7288, Institut de Biologie du Développement de Marseille (IBDM), 13288 Marseille, France
| | - Laure-Emmanuelle Zaragosi
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR-7275, 660 route des Lucioles, 06560 Sophia-Antipolis, France.,University of Nice-Sophia-Antipolis (UNS), Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des Lucioles, Valbonne, 06560 Sophia-Antipolis, France
| | - Andrea Pasini
- Aix-Marseille Université, CNRS, UMR7288, Institut de Biologie du Développement de Marseille (IBDM), 13288 Marseille, France
| | - Laurent Kodjabachian
- Aix-Marseille Université, CNRS, UMR7288, Institut de Biologie du Développement de Marseille (IBDM), 13288 Marseille, France
| | - Pascal Barbry
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR-7275, 660 route des Lucioles, 06560 Sophia-Antipolis, France.,University of Nice-Sophia-Antipolis (UNS), Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des Lucioles, Valbonne, 06560 Sophia-Antipolis, France
| | - Brice Marcet
- CNRS, Institut de Pharmacologie Moléculaire et Cellulaire (IPMC), UMR-7275, 660 route des Lucioles, 06560 Sophia-Antipolis, France.,University of Nice-Sophia-Antipolis (UNS), Institut de Pharmacologie Moléculaire et Cellulaire, 660 route des Lucioles, Valbonne, 06560 Sophia-Antipolis, France
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86
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Seppälä J, Tossavainen H, Rodic N, Permi P, Pentikäinen U, Ylänne J. Flexible Structure of Peptide-Bound Filamin A Mechanosensor Domain Pair 20-21. PLoS One 2015; 10:e0136969. [PMID: 26322797 PMCID: PMC4554727 DOI: 10.1371/journal.pone.0136969] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 08/12/2015] [Indexed: 11/18/2022] Open
Abstract
Filamins (FLNs) are large, multidomain actin cross-linking proteins with diverse functions. Besides regulating the actin cytoskeleton, they serve as important links between the extracellular matrix and the cytoskeleton by binding cell surface receptors, functioning as scaffolds for signaling proteins, and binding several other cytoskeletal proteins that regulate cell adhesion dynamics. Structurally, FLNs are formed of an amino terminal actin-binding domain followed by 24 immunoglobulin-like domains (IgFLNs). Recent studies have demonstrated that myosin-mediated contractile forces can reveal hidden protein binding sites in the domain pairs IgFLNa18–19 and 20–21, enabling FLNs to transduce mechanical signals in cells. The atomic structures of these mechanosensor domain pairs in the resting state are known, as well as the structures of individual IgFLN21 with ligand peptides. However, little experimental data is available on how interacting protein binding deforms the domain pair structures. Here, using small-angle x-ray scattering-based modelling, x-ray crystallography, and NMR, we show that the adaptor protein migfilin-derived peptide-bound structure of IgFLNa20–21 is flexible and adopts distinctive conformations depending on the presence or absence of the interacting peptide. The conformational changes reported here may be common for all peptides and may play a role in the mechanosensor function of the site.
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Affiliation(s)
- Jonne Seppälä
- Department of Biological and Environmental Science and Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
- * E-mail:
| | - Helena Tossavainen
- Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Nebojsa Rodic
- Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Perttu Permi
- Program in Structural Biology and Biophysics, Institute of Biotechnology, University of Helsinki, Helsinki, Finland
| | - Ulla Pentikäinen
- Department of Biological and Environmental Science and Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
| | - Jari Ylänne
- Department of Biological and Environmental Science and Nanoscience Center, University of Jyväskylä, Jyväskylä, Finland
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87
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Kindlin-2 controls TGF-β signalling and Sox9 expression to regulate chondrogenesis. Nat Commun 2015; 6:7531. [PMID: 26151572 PMCID: PMC4498276 DOI: 10.1038/ncomms8531] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2014] [Accepted: 05/14/2015] [Indexed: 02/08/2023] Open
Abstract
The signals that control skeletogenesis are incompletely understood. Here we show that deleting Kindlin-2 in Prx1-expressing mesenchymal progenitors in mice causes neonatal lethality, chondrodysplasia and loss of the skull vault. Kindlin-2 ablation reduces chondrocyte density by decreasing cell proliferation and increasing apoptosis, and disrupts column formation, thus impairing the formation of the primary ossification center and causing severe limb shortening. Remarkably, Kindlin-2 localizes to not only focal adhesions, but also to the nuclei of chondrocytes. Loss of Kindlin-2 reduces, while the overexpression of Kindlin-2 increases, Sox9 expression. Furthermore, the overexpression of Sox9 restores the defects in chondrogenic differentiation induced by Kindlin-2 deletion in vitro. In addition, Kindlin-2 ablation inhibits TGF-β1-induced Smad2 phosphorylation and chondrocyte differentiation. Finally, deleting Kindlin-2 in chondrocytes directly impairs chondrocyte functions, resulting in progressive dwarfism and kyphosis in mice. These studies uncover a previously unrecognized function for Kindlin-2 and a mechanism for regulation of the chondrocyte differentiation programme and chondrogenesis. The Kidlins are proteins found in cell focal adhesion sites where they regulate integrins, and in the nucleus where their role is unknown. Here the authors show that Kindlin-2 controls chondrogenesis by regulating integrin b1 activation and Sox9 and TGF-β nuclear signalling.
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88
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Qi L, Yu Y, Chi X, Xu W, Lu D, Song Y, Zhang Y, Zhang H. Kindlin-2 interacts with α-actinin-2 and β1 integrin to maintain the integrity of the Z-disc in cardiac muscles. FEBS Lett 2015; 589:2155-62. [PMID: 26143257 DOI: 10.1016/j.febslet.2015.06.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/18/2015] [Accepted: 06/21/2015] [Indexed: 01/06/2023]
Abstract
Kindlin-2, as an integrin-interacting protein, was known to be required for the maintenance of cardiac structure and function in zebrafish. However, the mechanism remains unclear. We found that Kindlin-2 interacts and colocalizes with α-actinin-2 at the Z-disc of mouse cardiac muscles and there Kindlin-2 also interacts with β1 integrin. Knockdown of Kindlin-2 influences the association of β1 integrin with α-actinin-2 and disrupts the structure of the Z-disc and leads to cardiac dysfunction. Our data indicated that Kindlin-2 is a novel α-actinin-2-interacting protein and plays an important role in the regulation of cardiac structure and function.
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Affiliation(s)
- Lihua Qi
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China
| | - Yu Yu
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China
| | - Xiaochun Chi
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China
| | - Weizhi Xu
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China
| | - Danyu Lu
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China
| | - Yao Song
- Institute for Cardiovascular Research, Peking University Health Science Center, Beijing 100191, China
| | - Youyi Zhang
- Institute for Cardiovascular Research, Peking University Health Science Center, Beijing 100191, China
| | - Hongquan Zhang
- Key Laboratory of Carcinogenesis and Translational Research, Ministry of Education, and State Key Laboratory of Natural and Biomimetic Drugs, Peking University Health Science Center, Beijing 100191, China; Department of Anatomy, Histology and Embryology, Peking University Health Science Center, Beijing 100191, China.
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89
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Liu Z, Lu D, Wang X, Wan J, Liu C, Zhang H. Kindlin-2 phosphorylation by Src at Y193 enhances Src activity and is involved in Migfilin recruitment to the focal adhesions. FEBS Lett 2015; 589:2001-10. [DOI: 10.1016/j.febslet.2015.05.038] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Revised: 05/18/2015] [Accepted: 05/20/2015] [Indexed: 01/06/2023]
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90
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Artym VV. Dense fibrillar collagen is a master activator of invadopodia. Mol Cell Oncol 2015; 3:e1035476. [PMID: 27314068 DOI: 10.1080/23723556.2015.1035476] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 03/23/2015] [Accepted: 03/24/2015] [Indexed: 10/25/2022]
Abstract
Tumor stroma is characterized by abnormal accumulation of dense fibrillar collagen, which promotes tumor progression and metastasis. However, the effect of desmoplastic collagen on cells has been unclear. Our recent findings demonstrate that dense fibrillar collagen activates a novel phosphosignaling mechanism for robust induction of invadopodia in tumor cells and normal fibroblasts.
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Affiliation(s)
- Vira V Artym
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research, National Institutes of Health , Bethesda, MD, USA
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91
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Liu J, Das M, Yang J, Ithychanda SS, Yakubenko VP, Plow EF, Qin J. Structural mechanism of integrin inactivation by filamin. Nat Struct Mol Biol 2015; 22:383-9. [PMID: 25849143 PMCID: PMC4424056 DOI: 10.1038/nsmb.2999] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 03/05/2015] [Indexed: 12/15/2022]
Abstract
Activation of heterodimeric (αβ) integrin is crucial for regulating cell adhesion. Binding of talin to the cytoplasmic face of integrin activates the receptor, but how integrin is maintained in a resting state to counterbalance its activation has remained obscure. Here, we report the structure of the cytoplasmic domain of human integrin αIIbβ3 bound to its inhibitor, the immunoglobin repeat 21 of filamin A (FLNa-Ig21). The structure reveals an unexpected ternary complex in which FLNa-Ig21 not only binds to the C terminus of the integrin β3 cytoplasmic tail (CT), as previously predicted, but also engages N-terminal helices of αIIb and β3 CTs to stabilize an inter-CT clasp that helps restrain the integrin in a resting state. Combined with functional data, the structure reveals a new mechanism of filamin-mediated retention of inactive integrin, suggesting a new framework for understanding regulation of integrin activation and adhesion.
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Affiliation(s)
| | | | - Jun Yang
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, Ohio, USA
| | - Sujay Subbayya Ithychanda
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, Ohio, USA
| | - Valentin P. Yakubenko
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, Ohio, USA
| | - Edward F Plow
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, Ohio, USA
| | - Jun Qin
- Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, 9500 Euclid Ave., Cleveland, Ohio, USA
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92
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Haubner BJ, Moik D, Schuetz T, Reiner MF, Voelkl JG, Streil K, Bader K, Zhao L, Scheu C, Mair J, Pachinger O, Metzler B. In vivo cardiac role of migfilin during experimental pressure overload. Cardiovasc Res 2015; 106:398-407. [DOI: 10.1093/cvr/cvv125] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 03/14/2015] [Indexed: 11/14/2022] Open
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93
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Artym VV, Swatkoski S, Matsumoto K, Campbell CB, Petrie RJ, Dimitriadis EK, Li X, Mueller SC, Bugge TH, Gucek M, Yamada KM. Dense fibrillar collagen is a potent inducer of invadopodia via a specific signaling network. ACTA ACUST UNITED AC 2015; 208:331-50. [PMID: 25646088 PMCID: PMC4315243 DOI: 10.1083/jcb.201405099] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
High-density fibrillar collagen matrix induces invadopodia formation in both fibroblasts and carcinoma cell lines through a kindlin2-dependent mechanism that drives local ECM remodeling. Cell interactions with the extracellular matrix (ECM) can regulate multiple cellular activities and the matrix itself in dynamic, bidirectional processes. One such process is local proteolytic modification of the ECM. Invadopodia of tumor cells are actin-rich proteolytic protrusions that locally degrade matrix molecules and mediate invasion. We report that a novel high-density fibrillar collagen (HDFC) matrix is a potent inducer of invadopodia, both in carcinoma cell lines and in primary human fibroblasts. In carcinoma cells, HDFC matrix induced formation of invadopodia via a specific integrin signaling pathway that did not require growth factors or even altered gene and protein expression. In contrast, phosphoproteomics identified major changes in a complex phosphosignaling network with kindlin2 serine phosphorylation as a key regulatory element. This kindlin2-dependent signal transduction network was required for efficient induction of invadopodia on dense fibrillar collagen and for local degradation of collagen. This novel phosphosignaling mechanism regulates cell surface invadopodia via kindlin2 for local proteolytic remodeling of the ECM.
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Affiliation(s)
- Vira V Artym
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892 Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical School; and Department of Biostatistics, Bioinformatics, and Biomathematics; Georgetown University, Washington, DC 20057
| | - Stephen Swatkoski
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Kazue Matsumoto
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Catherine B Campbell
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Ryan J Petrie
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Emilios K Dimitriadis
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Xin Li
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical School; and Department of Biostatistics, Bioinformatics, and Biomathematics; Georgetown University, Washington, DC 20057
| | - Susette C Mueller
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University Medical School; and Department of Biostatistics, Bioinformatics, and Biomathematics; Georgetown University, Washington, DC 20057
| | - Thomas H Bugge
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Marjan Gucek
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
| | - Kenneth M Yamada
- Laboratory of Cell and Developmental Biology, National Institute of Dental and Craniofacial Research; Proteomics Core Facility, National Heart, Lung, and Blood Institute; Biomolecular Engineering and Physical Sciences Shared Resource Program, National Institute of Biomolecular Imaging and Bioengineering; Oral and Pharyngeal Cancer Branch, National Institute of Dental and Craniofacial Research; National Institutes of Health, Bethesda, MD 20892
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94
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Gkretsi V, Bogdanos DP. Experimental evidence of Migfilin as a new therapeutic target of hepatocellular carcinoma metastasis. Exp Cell Res 2015; 334:219-27. [PMID: 25773778 DOI: 10.1016/j.yexcr.2015.03.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2014] [Revised: 03/01/2015] [Accepted: 03/04/2015] [Indexed: 02/07/2023]
Abstract
Migfilin is a novel cell-matrix adhesion protein known to interact with Vasodilator Stimulated Phosphoprotein (VASP) and be localized both at cell-matrix and cell-cell adhesions. To date there is nothing known about its role in hepatocellular carcinoma (HCC). As matrix is important in metastasis, we aimed to investigate the Migfilin׳s role in HCC metastasis using two human HCC cell lines that differ in their metastatic potential; non-invasive Alexander cells and the highly invasive HepG2 cells. We silenced Migfilin by siRNA and studied its effect on signaling and metastasis-related cellular properties. We show that Migfilin׳s expression is elevated in HepG2 cells and its silencing leads to upregulation of actin reorganization-related proteins, namely phosphor-VASP (Ser157 and Ser239), Fascin-1 and Rho-kinase-1, promoting actin polymerization and inhibiting cell invasion. Phosphor-Akt (Ser473) is decreased contributing to the upregulation of free and phosphor-β-catenin (Ser33/37Thr41) and inducing proliferation. Migfilin elimination upregulates Extracellular Signal-regulated kinase, which increases cell adhesion in HepG2 and reduces invasiveness. This is the first study to reveal that Migfilin inhibition can halt HCC metastasis in vitro, providing the molecular mechanism involved and presenting Migfilin as potential therapeutic target against HCC metastasis.
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Affiliation(s)
- Vasiliki Gkretsi
- Department of Biomedical Research and Technology, Institute for Research and Technology-Thessaly, Centre for Research and Technology-Hellas (CE.R.T.H.), Larissa 41222, Greece.
| | - Dimitrios P Bogdanos
- Department of Biomedical Research and Technology, Institute for Research and Technology-Thessaly, Centre for Research and Technology-Hellas (CE.R.T.H.), Larissa 41222, Greece; Department of Rheumatology, School of Medicine, University of Thessaly, University Hospital of Larissa, 41110 Larissa, Greece; Institute of Liver Studies, King׳s College Hospital, Denmark Hill, London SE5 9RS, UK
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95
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Zhang J, Li C, Tang X, Lu Q, Sa R, Zhang H. Proteome changes in the small intestinal mucosa of broilers (Gallus gallus) induced by high concentrations of atmospheric ammonia. Proteome Sci 2015; 13:9. [PMID: 25741220 PMCID: PMC4347970 DOI: 10.1186/s12953-015-0067-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 02/11/2015] [Indexed: 01/15/2023] Open
Abstract
Background Ammonia is a well-known toxicant both existing in atmospheric and aquatic system. So far, most studies of ammonia toxicity focused on mammals or aquatic animals. With the development of poultry industry, ammonia as a main source of contaminant in the air is causing more and more problems on broiler production, especially lower growth rate. The molecular mechanisms that underlie the negative effects of ammonia on the growth and intestine of broilers are yet unclear. We investigated the growth, gut morphology, and mucosal proteome of Arbor Acres broilers (Gallus gallus) exposed to high concentrations of atmospheric ammonia by performing a proteomics approach integrated with traditional methods. Results Exposure to ammonia interfered with the development of immune organ and gut villi. Meanwhile, it greatly reduced daily weight gain and feed intake, and enhanced feed conversion ratio. A total of 43 intestinal mucosal proteins were found to be differentially abundant. Up-regulated proteins are related to oxidative phosphorylation and apoptosis. Down-regulated proteins are related to cell structure and growth, transcriptional and translational regulation, immune response, oxidative stress and nutrient metabolism. These results indicated that exposure to ammonia triggered oxidative stress, and interfered with nutrient absorption and immune function in the small intestinal mucosa of broilers. Conclusions These findings have important implications for understanding the toxic mechanisms of ammonia on intestine of broilers, which provides new information that can be used for intervention using nutritional strategies in the future. Electronic supplementary material The online version of this article (doi:10.1186/s12953-015-0067-4) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jize Zhang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
| | - Cong Li
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
| | - Xiangfang Tang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
| | - Qingping Lu
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
| | - Renna Sa
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
| | - Hongfu Zhang
- State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100193 People's Republic of China
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96
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Bialkowska K, Byzova TV, Plow EF. Site-specific phosphorylation of kindlin-3 protein regulates its capacity to control cellular responses mediated by integrin αIIbβ3. J Biol Chem 2015; 290:6226-42. [PMID: 25609252 DOI: 10.1074/jbc.m114.634436] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The contributions of integrins to cellular responses depend upon their activation, which is regulated by binding of proteins to their cytoplasmic tails. Kindlins are integrin cytoplasmic tail binding partners and are essential for optimal integrin activation, and kindlin-3 fulfills this role in hematopoietic cells. Here, we used human platelets and human erythroleukemia (HEL) cells, which express integrin αIIbβ3, to investigate whether phosphorylation of kindlin-3 regulates integrin activation. When HEL cells were stimulated with thrombopoietin or phorbol 12-myristate 13-acetate (PMA), αIIbβ3 became activated as evidenced by binding of an activation-specific monoclonal antibody and soluble fibrinogen, adherence and spreading on fibrinogen, colocalization of β3 integrin and kindlin-3 in focal adhesions, and enhanced β3 integrin-kindlin-3 association in immunoprecipitates. Kindlin-3 knockdown impaired adhesion and spreading on fibrinogen. Stimulation of HEL cells with agonists significantly increased kindlin-3 phosphorylation as detected by mass spectrometric sequencing. Thr(482) or Ser(484) was identified as a phosphorylation site, which resides in a sequence not conserved in kindlin-1 or kindlin-2. These same residues were phosphorylated in kindlin-3 when platelets were stimulated with thrombin. When expressed in HEL cells, T482A/S484A kindlin-3 decreased soluble ligand binding and cell spreading on fibrinogen compared with wild-type kindlin-3. A membrane-permeable peptide containing residues 476-485 of kindlin-3 was introduced into HEL cells and platelets; adhesion and spreading of both cell types were blunted compared with a scrambled control peptide. These data identify a role of kindlin-3 phosphorylation in integrin β3 activation and provide a basis for functional differences between kindlin-3 and the two other kindlin paralogs.
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Affiliation(s)
- Katarzyna Bialkowska
- From the Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Tatiana V Byzova
- From the Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
| | - Edward F Plow
- From the Joseph J. Jacobs Center for Thrombosis and Vascular Biology, Department of Molecular Cardiology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio 44195
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97
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He S, Hou X, Xu X, Wan C, Yin P, Liu X, Chen Y, Shu B, Liu F, Xu J. Quantitative proteomic analysis reveals heat stress-induced injury in rat small intestine via activation of the MAPK and NF-κB signaling pathways. MOLECULAR BIOSYSTEMS 2015; 11:826-34. [DOI: 10.1039/c4mb00495g] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
We employed comparative proteomics to reveal a heat stress-induced injury mechanism in rat small intestine.
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98
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Szeto SG, Williams EC, Rudner AD, Lee JM. Phosphorylation of filamin A by Cdk1 regulates filamin A localization and daughter cell separation. Exp Cell Res 2015; 330:248-266. [DOI: 10.1016/j.yexcr.2014.10.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 09/20/2014] [Accepted: 10/22/2014] [Indexed: 01/30/2023]
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99
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Qu H, Tu Y, Guan JL, Xiao G, Wu C. Kindlin-2 tyrosine phosphorylation and interaction with Src serve as a regulatable switch in the integrin outside-in signaling circuit. J Biol Chem 2014; 289:31001-13. [PMID: 25237194 DOI: 10.1074/jbc.m114.580811] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
Integrin-mediated cell-extracellular matrix (ECM) adhesion is critical for control of intracellular signaling; however, the mechanisms underlying this "outside-in" signaling are incompletely understood. Here we show that depletion of kindlin-2 impairs integrin outside-in signaling. Kindlin-2 is tyrosine-phosphorylated upon cell-ECM adhesion. Furthermore, kindlin-2 binds Src in a cell-ECM adhesion-regulatable fashion. At the molecular level, the kindlin-2·Src interaction is mediated by the kindlin-2 F0 and the Src SH2 and SH3 domains. Src activation increases kindlin-2 tyrosine phosphorylation and the kindlin-2·Src interaction. Conversely, inhibition of Src reduces kindlin-2 tyrosine phosphorylation and diminishes the kindlin-2·Src interaction. Finally, disruption of the kindlin-2·Src interaction, unlike depletion of kindlin-2, impairs neither cell-ECM adhesion nor cell-ECM adhesion-induced focal adhesion kinase Tyr-397 phosphorylation. However, it markedly inhibits cell-ECM adhesion-induced paxillin tyrosine phosphorylation, cell migration, and proliferation. These results suggest that kindlin-2 tyrosine phosphorylation and interaction with Src serve as a regulatable switch downstream of focal adhesion kinase in the integrin outside-in signaling circuit, relaying signals from cell-ECM adhesion to paxillin that control cell migration and proliferation.
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Affiliation(s)
- Hong Qu
- From the Department of Pathology, University of Pittsburgh, Pittsburgh, Pittsburgh 15261
| | - Yizeng Tu
- From the Department of Pathology, University of Pittsburgh, Pittsburgh, Pittsburgh 15261
| | - Jun-Lin Guan
- the Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267, and
| | - Guozhi Xiao
- the Department of Biochemistry, Rush University Medical Center, Chicago, Illinois 60612
| | - Chuanyue Wu
- From the Department of Pathology, University of Pittsburgh, Pittsburgh, Pittsburgh 15261,
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100
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Fagan-Solis KD, Schneider SS, Pentecost BT, Bentley BA, Otis CN, Gierthy JF, Arcaro KF. The RhoA pathway mediates MMP-2 and MMP-9-independent invasive behavior in a triple-negative breast cancer cell line. J Cell Biochem 2014; 114:1385-94. [PMID: 23255405 DOI: 10.1002/jcb.24480] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 12/06/2012] [Indexed: 01/01/2023]
Abstract
Breast cancer is a heterogeneous disease that varies in its biology and response to therapy. A foremost threat to patients is tumor invasion and metastasis, with the greatest risk among patients diagnosed with triple-negative and/or basal-like breast cancers. A greater understanding of the molecular mechanisms underlying cancer cell spreading is needed as 90% of cancer-associated deaths result from metastasis. We previously demonstrated that the Tamoxifen-selected, MCF-7 derivative, TMX2-28, lacks expression of estrogen receptor α (ERα) and is highly invasive, yet maintains an epithelial morphology. The present study was designed to further characterize TMX2-28 cells and elucidate their invasion mechanism. We found that TMX2-28 cells do not express human epidermal growth factor receptor 2 (HER2) and progesterone receptor (PR), in addition to lacking ERα, making the cells triple-negative. We then determined that TMX2-28 cells lack expression of active matrix metalloproteinases (MMPs)-1, MMP-2, MMP-9, and other genes involved in epithelial-mesenchymal transition (EMT) suggesting that TMX2-28 may not utilize mesenchymal invasion. In contrast, TMX2-28 cells have high expression of Ras Homolog Gene Family Member, A (RhoA), a protein known to play a critical role in amoeboid invasion. Blocking RhoA activity with the RhoA pathway specific inhibitor H-1152, or a RhoA specific siRNA, resulted in inhibition of invasive behavior. Collectively, these results suggest that TMX2-28 breast cancer cells exploit a RhoA-dependent, proteolytic-independent invasion mechanism. Targeting the RhoA pathway in triple-negative, basal-like breast cancers that have a proteolytic-independent invasion mechanism may provide therapeutic strategies for the treatment of patients with increased risk of metastasis.
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Affiliation(s)
- Katerina D Fagan-Solis
- Molecular and Cellular Biology Graduate Program, University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA.
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