1
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Torii T, Miyamoto Y, Yamauchi J. Myelination by signaling through Arf guanine nucleotide exchange factor. J Neurochem 2024. [PMID: 38894552 DOI: 10.1111/jnc.16141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2024] [Revised: 05/19/2024] [Accepted: 05/23/2024] [Indexed: 06/21/2024]
Abstract
During myelination, large quantities of proteins are synthesized and transported from the endoplasmic reticulum (ER)-trans-Golgi network (TGN) to their appropriate locations within the intracellular region and/or plasma membrane. It is widely believed that oligodendrocytes uptake neuronal signals from neurons to regulate the endocytosis- and exocytosis-mediated intracellular trafficking of major myelin proteins such as myelin-associated glycoprotein (MAG) and proteolipid protein 1 (PLP1). The small GTPases of the adenosine diphosphate (ADP) ribosylation factor (Arf) family constitute a large group of signal transduction molecules that act as regulators for intracellular signaling, vesicle sorting, or membrane trafficking in cells. Studies on mice deficient in Schwann cell-specific Arfs-related genes have revealed abnormal myelination formation in peripheral nerves, indicating that Arfs-mediated signaling transduction is required for myelination in Schwann cells. However, the complex roles in these events remain poorly understood. This review aims to provide an update on signal transduction, focusing on Arf and its activator ArfGEF (guanine nucleotide exchange factor for Arf) in oligodendrocytes and Schwann cells. Future studies are expected to provide important information regarding the cellular and physiological processes underlying the myelination of oligodendrocytes and Schwann cells and their function in modulating neural activity.
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Affiliation(s)
- Tomohiro Torii
- Department of Biochemistry, Kitasato University School of Medicine, Sagamihara-shi, Kanagawa, Japan
| | - Yuki Miyamoto
- Department of Pharmacology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Junji Yamauchi
- Laboratory of Molecular Neuroscience and Neurology, Tokyo University of Pharmacy and Life Sciences, Hachioji, Tokyo, Japan
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2
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Zlobin AS, Volkova NA, Zinovieva NA, Iolchiev BS, Bagirov VA, Borodin PM, Axenovich TI, Tsepilov YA. Loci Associated with Negative Heterosis for Viability and Meat Productivity in Interspecific Sheep Hybrids. Animals (Basel) 2023; 13:ani13010184. [PMID: 36611792 PMCID: PMC9817718 DOI: 10.3390/ani13010184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/15/2022] [Accepted: 12/19/2022] [Indexed: 01/05/2023] Open
Abstract
Negative heterosis can occur on different economically important traits, but the exact biological mechanisms of this phenomenon are still unknown. The present study focuses on determining the genetic factors associated with negative heterosis in interspecific hybrids between domestic sheep (Ovis aries) and argali (Ovis ammon). One locus (rs417431015) associated with viability and two loci (rs413302370, rs402808951) associated with meat productivity were identified. One gene (ARAP2) was prioritized for viability and three for meat productivity (PDE2A, ARAP1, and PCDH15). The loci associated with meat productivity were demonstrated to fit the overdominant inheritance model and could potentially be involved int negative heterosis mechanisms.
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Affiliation(s)
- Alexander S. Zlobin
- Kurchatov Genomic Center, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences SB RAS, 630090 Novosibirsk, Russia
| | - Natalia A. Volkova
- L.K. Ernst Federal Science Center for Animal Husbandry, 101000 Moscow, Russia
| | | | - Baylar S. Iolchiev
- L.K. Ernst Federal Science Center for Animal Husbandry, 101000 Moscow, Russia
| | - Vugar A. Bagirov
- L.K. Ernst Federal Science Center for Animal Husbandry, 101000 Moscow, Russia
| | - Pavel M. Borodin
- Institute of Cytology and Genetics, SB RAS, 630090 Novosibirsk, Russia
| | | | - Yakov A. Tsepilov
- Kurchatov Genomic Center, Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences SB RAS, 630090 Novosibirsk, Russia
- Correspondence:
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3
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Yoon HY, Maron BY, Girald-Berlingeri S, Gasilina A, Gollin JC, Jian X, Akpan I, Yohe ME, Randazzo PA, Chen PW. ERK phosphorylation is dependent on cell adhesion in a subset of pediatric sarcoma cell lines. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2022; 1869:119264. [PMID: 35381293 DOI: 10.1016/j.bbamcr.2022.119264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 03/15/2022] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
Osteosarcoma (OS) and Pax-Foxo1 fusion negative rhabdomyosarcoma (FN-RMS) are pediatric sarcomas with poor prognoses in patients with advanced disease. In both malignancies, an actin binding protein has been linked to poor prognosis. Integrin adhesion complexes (IACs) are closely coupled to actin networks and IAC-mediated signaling has been implicated in the progression of carcinomas. However, the relationship of IACs and actin cytoskeleton remodeling with cell signaling is understudied in pediatric sarcomas. Here, we tested the hypothesis that IAC dynamics affect ERK activation in OS and FN-RMS cell lines. Adhesion dependence of ERK activation differed among the OS and FN-RMS cells examined. In the OS cell lines, adhesion did not have a consistent effect on phospho-ERK (pERK). ERK phosphorylation in response to fetal calf serum or 1 ng/ml EGF was nearly as efficient in OS cell lines and one FN-RMS cell line in suspension as cells adherent to poly-l-lysine (PL) or fibronectin (FN). By contrast, adhesion to plastic, PL or FN increased ERK phosphorylation and was greater than additive with a 15 min exposure to 1 ng/ml EGF in three FN-RMS cell lines. Increases in pERK were partly dependent on FAK and PAK1/2 but independent of IAC maturation. As far as we are aware, this examination of adhesion-dependent signaling is the first in pediatric sarcomas and has led to the discovery of differences from the prevailing paradigms and differences in the degree of coupling between components in the signaling pathways among the cell lines.
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Affiliation(s)
- Hye-Young Yoon
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America
| | - Ben Y Maron
- Department of Biology, Williams College, Williamstown, MA, United States of America
| | - Sofia Girald-Berlingeri
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America
| | - Anjelika Gasilina
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America
| | - Josephine C Gollin
- Department of Biology, Williams College, Williamstown, MA, United States of America
| | - Xiaoying Jian
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America
| | - Itoro Akpan
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America
| | - Marielle E Yohe
- Laboratory of Cell and Developmental Signaling, Center for Cancer Research, National Cancer Institute, Frederick, MD, United States of America
| | - Paul A Randazzo
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, United States of America.
| | - Pei-Wen Chen
- Department of Biology, Williams College, Williamstown, MA, United States of America
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4
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Kurosaki M, Terao M, Liu D, Zanetti A, Guarrera L, Bolis M, Gianni’ M, Paroni G, Goodall GJ, Garattini E. A DOCK1 Gene-Derived Circular RNA Is Highly Expressed in Luminal Mammary Tumours and Is Involved in the Epithelial Differentiation, Growth, and Motility of Breast Cancer Cells. Cancers (Basel) 2021; 13:cancers13215325. [PMID: 34771489 PMCID: PMC8582367 DOI: 10.3390/cancers13215325] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 12/20/2022] Open
Abstract
Circular RNAs are regulatory molecules involved in numerous cellular processes and may be involved in tumour growth and diffusion. Here, we define the expression of 15 selected circular RNAs, which may control the process of epithelial-to-mesenchymal transition, using a panel of 18 breast cancer cell lines recapitulating the heterogeneity of these tumours and consisting of three groups according to the mesenchymal/epithelial phenotype. A circular RNA from the DOCK1 gene (hsa_circ_0020397) shows low/undetectable levels in triple-negative mesenchymal cell lines, while its content is high in epithelial cell lines, independent of estrogen receptor or HER2 positivity. RNA-sequencing experiments performed on the triple-negative/mesenchymal MDA-MB-231 and MDA-MB-157 cell lines engineered to overexpress hsa_circ_0020397 demonstrate that the circRNA influences the expression of 110 common genes. Pathway analysis of these genes indicates that overexpression of the circular RNA differentiates the two mesenchymal cell lines along the epithelial pathway and increases cell-to-cell adhesion. This is accompanied by growth inhibition and a reduction in the random/directional motility of the cell lines. The upregulated AGR2, ENPP1, and PPP1R9A genes as well as the downregulated APOE, AQP3, CD99L2, and IGFBP4 genes show an opposite regulation by hsa_circ_0020397 silencing in luminal CAMA1 cells. The results provide novel insights into the role played by specific circular RNAs in the generation/progression of breast cancer.
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Affiliation(s)
- Mami Kurosaki
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Mineko Terao
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Dawei Liu
- Centre for Cancer Biology, An Alliance of SA Pathology and University of South Australia, Adelaide, SA 5000, Australia; (D.L.); (G.J.G.)
| | - Adriana Zanetti
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Luca Guarrera
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Marco Bolis
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
- Institute of Oncology Research, USI, University of Southern Switzerland, 6500 Bellinzona, Switzerland
| | - Maurizio Gianni’
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Gabriela Paroni
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
| | - Gregory J. Goodall
- Centre for Cancer Biology, An Alliance of SA Pathology and University of South Australia, Adelaide, SA 5000, Australia; (D.L.); (G.J.G.)
- Department of Medicine, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Enrico Garattini
- Laboratory of Molecular Biology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milano, Italy; (M.K.); (M.T.); (A.Z.); (L.G.); (M.B.); (M.G.); (G.P.)
- Correspondence: ; Tel.: +39-02-39014533
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5
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Zhong T, Li Y, He X, Liu Y, Dong Y, Ma H, Zheng Z, Zhang Y. Adaptation of endothelial cells to shear stress under atheroprone conditions by modulating internalization of vascular endothelial cadherin and vinculin. ANNALS OF TRANSLATIONAL MEDICINE 2020; 8:1423. [PMID: 33313168 PMCID: PMC7723531 DOI: 10.21037/atm-20-3426] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Background Endothelial cells play a pivotal role in cardiovascular physiology and pathology by providing a barrier to the bloodstream. In the current study, we investigated the phenotype and barrier function of endothelial cells in response to shear stress under pro-atherogenic conditions. Methods Endothelial cells were exposed to laminar shear stress (LSS) in a parallel-plate flow chamber containing oxidized low-density lipoprotein (oxLDL) in the perfusion solution, or remained static. We quantified the response of endothelial monolayers to LSS and oxLDL in terms of cell viability, barrier integrity, vascular endothelial cadherin (VE-cadherin) availability, focal adhesion (FA) remodeling, and monocyte-endothelial interactions. Results Our results showed that oxLDL stimulation and static conditions synergized to enhance endothelial barrier disruption. Under the same oxLDL challenge, the application of 25 dynes/cm2 LSS on the endothelial monolayer decreased the passage of fluorescein isothiocyanate (FITC)-dextran by 37.79%, increased transendothelial electrical resistance (TEER) by 24.97% compared with static cells (P<0.05), which was accompanied by reduced intercellular gap formation, relatively solid cell-substrate adhesion. Compared with static cells, endothelial cells exposed to both laminar flow and oxLDL had less small FAs, less monocyte adhesion and transmigration, and alleviated overexpression of VCAM-1 and MCP-1. Meanwhile, the oxLDL-induced internalization of VE-cadherin and vinculin were also attenuated by laminar flow, and this change was more pronounced at LSS of 25 dynes/cm2 than 5 dynes/cm2. Conclusions Static conditions favor, whereas physiologically higher levels of LSS ameliorate endothelial barrier disruption under pro-atherogenic stress, which is related to the improved availability of VE-cadherin and vinculin on the cell surface.
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Affiliation(s)
- Tingting Zhong
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Cardiology, Fuwai Hospital, Chinese Academy of Medical Sciences, Shenzhen, China
| | - Yanling Li
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China.,Department of Emergency, Third Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaohong He
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yongdong Liu
- Department of Pathology, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yugang Dong
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Hong Ma
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhensheng Zheng
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Yan Zhang
- Department of Cardiology, NHC Key Laboratory of Assisted Circulation, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
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6
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Bagci H, Sriskandarajah N, Robert A, Boulais J, Elkholi IE, Tran V, Lin ZY, Thibault MP, Dubé N, Faubert D, Hipfner DR, Gingras AC, Côté JF. Mapping the proximity interaction network of the Rho-family GTPases reveals signalling pathways and regulatory mechanisms. Nat Cell Biol 2019; 22:120-134. [DOI: 10.1038/s41556-019-0438-7] [Citation(s) in RCA: 78] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 11/19/2019] [Indexed: 12/17/2022]
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7
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Sztul E, Chen PW, Casanova JE, Cherfils J, Dacks JB, Lambright DG, Lee FJS, Randazzo PA, Santy LC, Schürmann A, Wilhelmi I, Yohe ME, Kahn RA. ARF GTPases and their GEFs and GAPs: concepts and challenges. Mol Biol Cell 2019; 30:1249-1271. [PMID: 31084567 PMCID: PMC6724607 DOI: 10.1091/mbc.e18-12-0820] [Citation(s) in RCA: 149] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Revised: 02/26/2019] [Accepted: 03/11/2019] [Indexed: 12/12/2022] Open
Abstract
Detailed structural, biochemical, cell biological, and genetic studies of any gene/protein are required to develop models of its actions in cells. Studying a protein family in the aggregate yields additional information, as one can include analyses of their coevolution, acquisition or loss of functionalities, structural pliability, and the emergence of shared or variations in molecular mechanisms. An even richer understanding of cell biology can be achieved through evaluating functionally linked protein families. In this review, we summarize current knowledge of three protein families: the ARF GTPases, the guanine nucleotide exchange factors (ARF GEFs) that activate them, and the GTPase-activating proteins (ARF GAPs) that have the ability to both propagate and terminate signaling. However, despite decades of scrutiny, our understanding of how these essential proteins function in cells remains fragmentary. We believe that the inherent complexity of ARF signaling and its regulation by GEFs and GAPs will require the concerted effort of many laboratories working together, ideally within a consortium to optimally pool information and resources. The collaborative study of these three functionally connected families (≥70 mammalian genes) will yield transformative insights into regulation of cell signaling.
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Affiliation(s)
- Elizabeth Sztul
- Department of Cell, Developmental and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Pei-Wen Chen
- Department of Biology, Williams College, Williamstown, MA 01267
| | - James E. Casanova
- Department of Cell Biology, University of Virginia, Charlottesville, VA 22908
| | - Jacqueline Cherfils
- Laboratoire de Biologie et Pharmacologie Appliquée, CNRS and Ecole Normale Supérieure Paris-Saclay, 94235 Cachan, France
| | - Joel B. Dacks
- Division of Infectious Disease, Department of Medicine, University of Alberta, Edmonton, AB T6G 2H7, Canada
| | - David G. Lambright
- Program in Molecular Medicine and Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Amherst, MA 01605
| | - Fang-Jen S. Lee
- Institute of Molecular Medicine, College of Medicine, National Taiwan University, Taipei 10002, Taiwan
| | | | - Lorraine C. Santy
- Department of Biochemistry and Molecular Biology, Pennsylvania State University, University Park, PA 16802
| | - Annette Schürmann
- German Institute of Human Nutrition, 85764 Potsdam-Rehbrücke, Germany
| | - Ilka Wilhelmi
- German Institute of Human Nutrition, 85764 Potsdam-Rehbrücke, Germany
| | - Marielle E. Yohe
- Pediatric Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, MD 20892
| | - Richard A. Kahn
- Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322-3050
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8
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Yoo JH, Brady SW, Acosta-Alvarez L, Rogers A, Peng J, Sorensen LK, Wolff RK, Mleynek T, Shin D, Rich CP, Kircher DA, Bild A, Odelberg SJ, Li DY, Holmen SL, Grossmann AH. The Small GTPase ARF6 Activates PI3K in Melanoma to Induce a Prometastatic State. Cancer Res 2019; 79:2892-2908. [PMID: 31048499 DOI: 10.1158/0008-5472.can-18-3026] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 01/11/2019] [Accepted: 04/09/2019] [Indexed: 12/17/2022]
Abstract
Melanoma has an unusual capacity to spread in early-stage disease, prompting aggressive clinical intervention in very thin primary tumors. Despite these proactive efforts, patients with low-risk, low-stage disease can still develop metastasis, indicating the presence of permissive cues for distant spread. Here, we show that constitutive activation of the small GTPase ARF6 (ARF6Q67L) is sufficient to accelerate metastasis in mice with BRAFV600E/Cdkn2aNULL melanoma at a similar incidence and severity to Pten loss, a major driver of PI3K activation and melanoma metastasis. ARF6Q67L promoted spontaneous metastasis from significantly smaller primary tumors than PTENNULL, implying an enhanced ability of ARF6-GTP to drive distant spread. ARF6 activation increased lung colonization from circulating melanoma cells, suggesting that the prometastatic function of ARF6 extends to late steps in metastasis. Unexpectedly, ARF6Q67L tumors showed upregulation of Pik3r1 expression, which encodes the p85 regulatory subunit of PI3K. Tumor cells expressing ARF6Q67L displayed increased PI3K protein levels and activity, enhanced PI3K distribution to cellular protrusions, and increased AKT activation in invadopodia. ARF6 is necessary and sufficient for activation of both PI3K and AKT, and PI3K and AKT are necessary for ARF6-mediated invasion. We provide evidence for aberrant ARF6 activation in human melanoma samples, which is associated with reduced survival. Our work reveals a previously unknown ARF6-PI3K-AKT proinvasive pathway, it demonstrates a critical role for ARF6 in multiple steps of the metastatic cascade, and it illuminates how melanoma cells can acquire an early metastatic phenotype in patients. SIGNIFICANCE: These findings reveal a prometastatic role for ARF6 independent of tumor growth, which may help explain how melanoma spreads distantly from thin, early-stage primary tumors.Graphical Abstract: http://cancerres.aacrjournals.org/content/canres/79/11/2892/F1.large.jpg.
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Affiliation(s)
- Jae Hyuk Yoo
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah
| | - Samuel W Brady
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Utah, Salt Lake City, Utah.,Department of Biomedical Informatics, School of Medicine, University of Utah, Salt Lake City, Utah
| | | | - Aaron Rogers
- Department of Pathology, University of Utah, Salt Lake City, Utah
| | - Jingfu Peng
- Department of Pathology, University of Utah, Salt Lake City, Utah
| | - Lise K Sorensen
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah
| | - Roger K Wolff
- Department of Pathology, University of Utah, Salt Lake City, Utah
| | - Tara Mleynek
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah
| | - Donghan Shin
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah
| | - Coulson P Rich
- Department of Pathology, University of Utah, Salt Lake City, Utah.,Huntsman Cancer Institute, University of Utah Health Sciences Center, Salt Lake City, Utah
| | - David A Kircher
- Department of Oncological Sciences, School of Medicine, University of Utah, Salt Lake City, Utah
| | - Andrea Bild
- Department of Pharmacology and Toxicology, College of Pharmacy, University of Utah, Salt Lake City, Utah.,Department of Oncological Sciences, School of Medicine, University of Utah, Salt Lake City, Utah.,Department of Medical Oncology and Therapeutics, City of Hope Comprehensive Cancer Institute, Monrovia, California
| | - Shannon J Odelberg
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah.,Department of Neurobiology and Anatomy, University of Utah, Salt Lake City, Utah.,Division of Cardiovascular Medicine, Department of Medicine, University of Utah, Salt Lake City, Utah
| | - Dean Y Li
- Department of Medicine, Program in Molecular Medicine, University of Utah, Salt Lake City, Utah.,Division of Cardiovascular Medicine, Department of Medicine, University of Utah, Salt Lake City, Utah.,Department of Human Genetics, University of Utah, Salt Lake City, Utah
| | - Sheri L Holmen
- Huntsman Cancer Institute, University of Utah Health Sciences Center, Salt Lake City, Utah.,Department of Oncological Sciences, School of Medicine, University of Utah, Salt Lake City, Utah.,Department of Surgery, University of Utah Health Sciences Center, Salt Lake City, Utah
| | - Allie H Grossmann
- Department of Pathology, University of Utah, Salt Lake City, Utah. .,Huntsman Cancer Institute, University of Utah Health Sciences Center, Salt Lake City, Utah.,ARUP Laboratories, University of Utah, Salt Lake City, Utah
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9
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Kong Y, Zhao L, Charette JR, Hicks WL, Stone L, Nishina PM, Naggert JK. An FRMD4B variant suppresses dysplastic photoreceptor lesions in models of enhanced S-cone syndrome and of Nrl deficiency. Hum Mol Genet 2019; 27:3340-3352. [PMID: 29947801 DOI: 10.1093/hmg/ddy238] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 06/04/2018] [Indexed: 12/16/2022] Open
Abstract
Photoreceptor dysplasia, characterized by formation of folds and (pseudo-)rosettes in the outer retina, is associated with loss of functional nuclear receptor subfamily 2 group E member 3 (NR2E3) and neural retina leucine-zipper (NRL) in both humans and mice. A sensitized chemical mutagenesis study to identify genetic modifiers that suppress photoreceptor dysplasia in Nr2e3rd7mutant mice identified line Tvrm222, which exhibits a normal fundus appearance in the presence of the rd7 mutation. The Tvrm222 modifier of Nr2e3rd7/rd7 was localized to Chromosome 6 and identified as a missense mutation in the FERM domain containing 4B (Frmd4b) gene. The variant is predicted to cause the substitution of a serine residue 938 with proline (S938P). The Frmd4bTvrm222 allele was also found to suppress outer nuclear layer (ONL) rosettes in Nrl-/- mice. Fragmentation of the external limiting membrane (ELM), normally observed in rd7 and Nrl-/-mouse retinas, was absent in the presence of the Frmd4bTvrm222 allele. FRMD4B, a binding partner of cytohesin 3, is proposed to participate in cell junction remodeling. Its biological function in photoreceptor dysplasia has not been previously examined. In vitro experiments showed that the FRMD4B938P variant fails to be efficiently recruited to the cell surface upon insulin stimulation. In addition, we found a reduction in protein kinase B phosphorylation and increased levels of cell junction proteins, Catenin beta 1 and tight junction protein 1, associated with the cell membrane in Tvrm222 retinas. Taken together, this study reveals a critical role of FRMD4B in maintaining ELM integrity and in rescuing morphological abnormalities of the ONL in photoreceptor dysplasia.
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Affiliation(s)
- Yang Kong
- Jackson Laboratory, Bar Harbor, ME, USA.,Graduate School of Biomedical Science and Engineering, University of Maine, Orono, ME, USA
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10
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Tanna CE, Goss LB, Ludwig CG, Chen PW. Arf GAPs as Regulators of the Actin Cytoskeleton-An Update. Int J Mol Sci 2019; 20:ijms20020442. [PMID: 30669557 PMCID: PMC6358971 DOI: 10.3390/ijms20020442] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2018] [Revised: 01/14/2019] [Accepted: 01/15/2019] [Indexed: 12/25/2022] Open
Abstract
Arf GTPase-activating proteins (Arf GAPs) control the activity of ADP-ribosylation factors (Arfs) by inducing GTP hydrolysis and participate in a diverse array of cellular functions both through mechanisms that are dependent on and independent of their Arf GAP activity. A number of these functions hinge on the remodeling of actin filaments. Accordingly, some of the effects exerted by Arf GAPs involve proteins known to engage in regulation of the actin dynamics and architecture, such as Rho family proteins and nonmuscle myosin 2. Circular dorsal ruffles (CDRs), podosomes, invadopodia, lamellipodia, stress fibers and focal adhesions are among the actin-based structures regulated by Arf GAPs. Arf GAPs are thus important actors in broad functions like adhesion and motility, as well as the specialized functions of bone resorption, neurite outgrowth, and pathogen internalization by immune cells. Arf GAPs, with their multiple protein-protein interactions, membrane-binding domains and sites for post-translational modification, are good candidates for linking the changes in actin to the membrane. The findings discussed depict a family of proteins with a critical role in regulating actin dynamics to enable proper cell function.
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Affiliation(s)
- Christine E Tanna
- Department of Biology, Williams College, Williamstown, MA 01267, USA.
| | - Louisa B Goss
- Department of Biology, Williams College, Williamstown, MA 01267, USA.
| | - Calvin G Ludwig
- Department of Biology, Williams College, Williamstown, MA 01267, USA.
| | - Pei-Wen Chen
- Department of Biology, Williams College, Williamstown, MA 01267, USA.
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11
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Staiculescu MC, Cocciolone AJ, Procknow JD, Kim J, Wagenseil JE. Comparative gene array analyses of severe elastic fiber defects in late embryonic and newborn mouse aorta. Physiol Genomics 2018; 50:988-1001. [PMID: 30312140 PMCID: PMC6293116 DOI: 10.1152/physiolgenomics.00080.2018] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 10/09/2018] [Accepted: 10/09/2018] [Indexed: 01/17/2023] Open
Abstract
Elastic fibers provide reversible elasticity to the large arteries and are assembled during development when hemodynamic forces are increasing. Mutations in elastic fiber genes are associated with cardiovascular disease. Mice lacking expression of the elastic fiber genes elastin ( Eln-/-), fibulin-4 ( Efemp2-/-), or lysyl oxidase ( Lox-/-) die at birth with severe cardiovascular malformations. All three genetic knockout models have elastic fiber defects, aortic wall thickening, and arterial tortuosity. However, Eln-/- mice develop arterial stenoses, while Efemp2-/- and Lox-/- mice develop ascending aortic aneurysms. We performed comparative gene array analyses of these three genetic models for two vascular locations and developmental stages to determine differentially expressed genes and pathways that may explain the common and divergent phenotypes. We first examined arterial morphology and wall structure in newborn mice to confirm that the lack of elastin, fibulin-4, or lysyl oxidase expression provided the expected phenotypes. We then compared gene expression levels for each genetic model by three-way ANOVA for genotype, vascular location, and developmental stage. We found three genes upregulated by genotype in all three models, Col8a1, Igfbp2, and Thbs1, indicative of a common response to severe elastic fiber defects in developing mouse aorta. Genes that are differentially regulated by vascular location or developmental stage in all three models suggest mechanisms for location or stage-specific disease pathology. Comparison of signaling pathways enriched in all three models shows upregulation of integrins and matrix proteins involved in early wound healing, but not of mature matrix molecules such as elastic fiber proteins or fibrillar collagens.
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Affiliation(s)
| | - Austin J Cocciolone
- Department of Biomedical Engineering, Washington University , St. Louis, Missouri
| | - Jesse D Procknow
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Jungsil Kim
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
| | - Jessica E Wagenseil
- Department of Mechanical Engineering and Materials Science, Washington University , St. Louis, Missouri
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12
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Luo R, Chen PW, Kuo JC, Jenkins L, Jian X, Waterman CM, Randazzo PA. ARAP2 inhibits Akt independently of its effects on focal adhesions. Biol Cell 2018; 110:257-270. [PMID: 30144359 DOI: 10.1111/boc.201800044] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 08/17/2018] [Indexed: 12/15/2022]
Abstract
BACKGROUND INFORMATION ARAP2, an Arf GTPase-activating protein (Arf GAP) that binds to adaptor protein with PH domain, PTB domain and leucine zipper motifs 1 (APPL1), regulates focal adhesions (FAs). APPL1 affects FA dynamics by regulating Akt. Here, we tested the hypothesis that ARAP2 affects FAs in part by regulating Akt through APPL1. RESULTS We found that ARAP2 controlled FA dynamics dependent on its enzymatic Arf GAP activity. In some cells, ARAP2 also regulated phosphoAkt (pAkt) levels. However, ARAP2 control of FAs did not require Akt and conversely, the effects on pAkt were independent of FAs. Reducing ARAP2 expression reduced the size and number of FAs in U118, HeLa and MDA-MB-231 cells. Decreasing ARAP2 expression increased pAkt in U118 cells and HeLa cells and overexpressing ARAP2 decreased pAkt in U118 cells; in contrast, ARAP2 had no effect on pAkt in MDA-MB-231 cells. An Akt inhibitor did not block the effect of reduced ARAP2 on FAs in U118. Furthermore, the effect of ARAP2 on Akt did not require Arf GAP activity, which is necessary for effects on FAs and integrin traffic. Altering FAs by other means did not induce the same changes in pAkt as those seen by reducing ARAP2 in U118 cells. In addition, we discovered that ARAP2 and APPL1 had co-ordinated effects on pAkt in U118 cells. Reduced APPL1 expression, as for ARAP2, increased pAkt in U118 and the effect of reduced APPL1 expression was reversed by overexpressing ARAP2. Conversely, the effect of reduced ARAP2 expression was reversed by overexpressing APPL1. ARAP2 is an Arf GAP that has previously been reported to affect FAs by regulating Arf6 and integrin trafficking and to bind to the adaptor proteins APPL1. Here, we report that ARAP2 suppresses pAkt levels in cells co-ordinately with APPL1 and independently of GAP activity and its effect on the dynamic behaviour of FAs. CONCLUSIONS We conclude that ARAP2 affects Akt signalling in some cells by a mechanism independent of FAs or membrane traffic. SIGNIFICANCE Our results highlight an Arf GAP-independent function of ARAP2 in regulating Akt activity and distinguish the effect of ARAP2 on Akt from that on FAs and integrin trafficking, which requires regulation of Arf6.
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Affiliation(s)
- Ruibai Luo
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Pei-Wen Chen
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD, 20892, USA.,Department of Biology, Williams College, Williamstown, MA, 01267, USA
| | - Jean-Cheng Kuo
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institutes, Bethesda, MD, 20892, USA.,Institute of Biochemistry and Molecular Biology, National Yang-Ming University, Taipei, 112, Taiwan
| | - Lisa Jenkins
- Laboratory of Cell Biology, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Xiaoying Jian
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Clare M Waterman
- Cell Biology and Physiology Center, National Heart, Lung, and Blood Institutes, Bethesda, MD, 20892, USA
| | - Paul A Randazzo
- Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD, 20892, USA
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13
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Li Q, Yang W, Wang Y, Liu W. Biochemical and Structural Studies of the Interaction between ARAP1 and CIN85. Biochemistry 2018; 57:2132-2139. [PMID: 29589748 DOI: 10.1021/acs.biochem.8b00057] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Arf-GAP with Rho-GAP domain, ANK repeat and PH domain-containing protein 1 (ARAP1), Cbl-interacting protein of 85 kDa (CIN85), and casitas B-lineage lymphoma (Cbl) play important roles in epidermal growth factor receptor (EGFR) internalization and recycling. In previous studies, ARAP1 was found to interact with CIN85, and their interaction attenuated the ubiquitination of EGFR. However, the molecular mechanism was still unclear. In this study, we first biochemically and structurally characterized the interaction between ARAP1 and CIN85, and found that the CIN85 SH3B domain bound to the ARAP1 PXPXXRX (except P) XXR/H/K motif with high affinity and specificity. Based on this binding model, we further predicted other potential CIN85 binding partners and tested their interactions biochemically. Moreover, our swapping data and structure alignment analysis suggested that the β2-β3 loops of the CIN85 SH3 domains and the H87ARAP1/E132CIN85 interaction were critical for ARAP1 binding specificity. Finally, our competitive analytical gel-filtration chromatography and isothermal titration calorimetry (ITC) results showed that ARAP1 could compete with Cbl for CIN85 binding, which provides a biochemical basis for the regulatory roles of ARAP1 in the CIN85-mediated EGFR internalizing process.
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Affiliation(s)
- Qingxia Li
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute , Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center , Shenzhen 518036 , China
| | | | - Yue Wang
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute , Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center , Shenzhen 518036 , China
| | - Wei Liu
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute , Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center , Shenzhen 518036 , China
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14
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Qiu J, Tao L, Wei Q, Zhang P. Knockdown of Arf6 increases drug sensitivity and inhibits proliferation, migration and invasion in gastric cancer SGC-7901 cells. Oncol Lett 2017; 15:2147-2152. [PMID: 29434918 PMCID: PMC5777091 DOI: 10.3892/ol.2017.7558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Accepted: 11/02/2017] [Indexed: 12/13/2022] Open
Abstract
ADP-ribosylation factor 6 (Arf6), a member of the ADP-ribosylation factor family, is overexpressed in different types of cancer cell and promotes invasion, metastasis and drug resistance. However, the potential functions of Arf6 in gastric cancer (GC), and the molecular mechanism underlying these functions, remain to be fully elucidated. In the present study, the results demonstrated that in vitro knockdown of Arf6 decreased proliferation, colony formation, migration and invasion in SGC-7901 cells. Arf6 knockdown also markedly decreased the activity of the extracellular signal-regulated kinase 1/2 (ERK1/2) signaling pathway. Furthermore, knockdown of Arf6 was associated with elevated chemosensitivity of SGC-7901 cells to 5-fluorouracil through inactivation of the ERK1/2 signaling pathway. Taken together, these results suggest that Arf6 is involved in regulating proliferation, migration, invasion and drug resistance in GC, and may be a potential therapeutic target for the treatment of GC.
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Affiliation(s)
- Junlan Qiu
- Department of General Surgery, Nanjing Drum Tower Hospital Clinical College, Nanjing Medical University, Nanjing, Jiangsu 210008, P.R. China
| | - Liang Tao
- Department of General Surgery, Nanjing Drum Tower Hospital Clinical College, Nanjing Medical University, Nanjing, Jiangsu 210008, P.R. China
| | - Qiang Wei
- Nanjing Emergency Medical Center, Nanjing, Jiangsu 210003, P.R. China
| | - Pingyang Zhang
- Department of Cardiovascular Ultrasound, Nanjing First Hospital Affiliated to Nanjing Medical University, Nanjing, Jiangsu 210006, P.R. China
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15
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ARF6 mediates nephrin tyrosine phosphorylation-induced podocyte cellular dynamics. PLoS One 2017; 12:e0184575. [PMID: 28880939 PMCID: PMC5589247 DOI: 10.1371/journal.pone.0184575] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Accepted: 08/26/2017] [Indexed: 01/10/2023] Open
Abstract
ADP-ribosylation factor 6 (ARF6) is a small GTPase necessary for regulating cellular structure, motility, and vesicle trafficking. In several cellular systems, ARF6 was shown to regulate actin dynamics in coordination with Rac1, a Rho small GTPase. We examined the function of ARF6 in the kidney podocyte because Rac1 was implicated in kidney diseases involving this cell. We found that ARF6 expression was enriched in human podocytes and that it modulated podocyte cytoskeletal dynamics through a functional interaction with nephrin, an intercellular junction protein necessary for podocyte injury-induced signaling requiring activation by tyrosine phosphorylation of its cytoplasmic domain. ARF6 was necessary for nephrin activation-induced ruffling and focal adhesion turnover, possibly by altering Rac1 activity. In podocyte-specific Arf6 (ARF6_PodKO) knockout mice, ARF6 deficiency did not result in a spontaneous kidney developmental phenotype or proteinuria after aging. However, ARF6_PodKO mice exhibited distinct phenotypes in two in vivo glomerular injury models. In the protamine sulfate perfusion model, which induced acute podocyte effacement, ARF6_PodKO mice were protected from podocyte effacement. In the nephrotoxic serum nephritis model, which induced immune-complex mediated injury, ARF6_PodKO mice exhibited aggravated proteinuria. Together, these observations suggest that while ARF6 is necessary for nephrin tyrosine phosphorylation-induced cytoskeletal dynamics in cultured podocytes, ARF6 has pleotropic podocyte roles in vivo, where glomerular injury-specific mechanisms might activate distinct signaling pathways that dictate whether ARF6 activity is beneficial or deleterious for maintaining the integrity of the glomerular filtration barrier.
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16
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Vitali T, Girald-Berlingeri S, Randazzo PA, Chen PW. Arf GAPs: A family of proteins with disparate functions that converge on a common structure, the integrin adhesion complex. Small GTPases 2017; 10:280-288. [PMID: 28362242 DOI: 10.1080/21541248.2017.1299271] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
ADP-ribosylation factors (Arfs) are members of the Ras GTPase superfamily. The function of Arfs is dependent on GTPase-activating proteins (GAPs) and guanine nucleotide exchange factors (GEFs), which allow Arfs to cycle between the GDP-bound and GTP-bound forms. Arf GAPs have been shown to be present in integrin adhesion complexes, which include focal adhesions. Integrin adhesion complexes are composed of integrins, scaffolding proteins and signaling proteins and regulate cell proliferation, survival, differentiation and migration. Understanding the role of Arf GAPs in the regulation of integrin adhesion complexes is relevant to understanding normal physiology and cancer. In this review, we will discuss the contribution of the Arf GAP family members to the regulation of integrin adhesion complexes, examining the diverse mechanisms by which they control integrin adhesion complex formation, maturation and dissolution. GIT1 and ARAP2 serve as GAPs for Arf6, regulating Rac1 and other effectors by mechanisms still being defined. In contrast, GIT2 regulates Rac1 independent of Arf6. AGAP2 binds to and regulates focal adhesion kinase (FAK). ARAP2 and ACAP1, both Arf6 GAPs, regulate membrane trafficking of integrins through different endocytic pathways, exerting opposite effects on focal adhesions. ASAP1 not only regulates actin cytoskeleton remodeling through its interaction with nonmuscle myosin 2A, but is also important in integrin recycling. These examples illustrate the diversity and versatility of Arf GAPs as regulators of integrin adhesion complex structure and function.
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Affiliation(s)
- Teresa Vitali
- a Laboratory of Cell and Molecular Biology , National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Sofia Girald-Berlingeri
- a Laboratory of Cell and Molecular Biology , National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Paul A Randazzo
- a Laboratory of Cell and Molecular Biology , National Cancer Institute, National Institutes of Health , Bethesda , MD , USA
| | - Pei-Wen Chen
- b Department of Biology , Williams College , Williamstown , MA , USA
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17
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Integrin-Dependent Regulation of Small GTPases: Role in Cell Migration. J Indian Inst Sci 2017. [DOI: 10.1007/s41745-016-0010-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Chaudhari A, Håversen L, Mobini R, Andersson L, Ståhlman M, Lu E, Rutberg M, Fogelstrand P, Ekroos K, Mardinoglu A, Levin M, Perkins R, Borén J. ARAP2 promotes GLUT1-mediated basal glucose uptake through regulation of sphingolipid metabolism. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1643-1651. [DOI: 10.1016/j.bbalip.2016.07.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2016] [Revised: 07/02/2016] [Accepted: 07/25/2016] [Indexed: 11/16/2022]
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19
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Abstract
Members of the ADP-ribosylation factor (Arf) family of small GTP-binding (G) proteins regulate several aspects of membrane trafficking, such as vesicle budding, tethering and cytoskeleton organization. Arf family members, including Arf-like (Arl) proteins have been implicated in several essential cellular functions, like cell spreading and migration. These functions are used by cancer cells to disseminate and invade the tissues surrounding the primary tumor, leading to the formation of metastases. Indeed, Arf and Arl proteins, as well as their guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs) have been found to be abnormally expressed in different cancer cell types and human cancers. Here, we review the current evidence supporting the involvement of Arf family proteins and their GEFs and GAPs in cancer progression, focusing on 3 different mechanisms: cell-cell adhesion, integrin internalization and recycling, and actin cytoskeleton remodeling.
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Affiliation(s)
- Cristina Casalou
- a CEDOC, NOVA Medical School - Faculdade de Ciências Médicas, Universidade NOVA de Lisboa , Lisbon , Portugal
| | - Alexandra Faustino
- a CEDOC, NOVA Medical School - Faculdade de Ciências Médicas, Universidade NOVA de Lisboa , Lisbon , Portugal.,b ProRegeM PhD Program, NOVA Medical School - Faculdade de Ciências Médicas, Universidade NOVA de Lisboa , Lisbon , Portugal
| | - Duarte C Barral
- a CEDOC, NOVA Medical School - Faculdade de Ciências Médicas, Universidade NOVA de Lisboa , Lisbon , Portugal
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20
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Chen PW, Jian X, Heissler SM, Le K, Luo R, Jenkins LM, Nagy A, Moss J, Sellers JR, Randazzo PA. The Arf GTPase-activating Protein, ASAP1, Binds Nonmuscle Myosin 2A to Control Remodeling of the Actomyosin Network. J Biol Chem 2016; 291:7517-26. [PMID: 26893376 DOI: 10.1074/jbc.m115.701292] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2015] [Indexed: 01/13/2023] Open
Abstract
ASAP1 regulates F-actin-based structures and functions, including focal adhesions (FAs) and circular dorsal ruffles (CDRs), cell spreading and migration. ASAP1 function requires its N-terminal BAR domain. We discovered that nonmuscle myosin 2A (NM2A) directly bound the BAR-PH tandem of ASAP1in vitro ASAP1 and NM2A co-immunoprecipitated and colocalized in cells. Knockdown of ASAP1 reduced colocalization of NM2A and F-actin in cells. Knockdown of ASAP1 or NM2A recapitulated each other's effects on FAs, cell migration, cell spreading, and CDRs. The NM2A-interacting BAR domain contributed to ASAP1 control of cell spreading and CDRs. Exogenous expression of NM2A rescued the effect of ASAP1 knockdown on CDRs but ASAP1 did not rescue NM2A knockdown defect in CDRs. Our results support the hypothesis that ASAP1 is a positive regulator of NM2A. Given other binding partners of ASAP1, ASAP1 may directly link signaling and the mechanical machinery of cell migration.
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Affiliation(s)
- Pei-Wen Chen
- From the Laboratory of Cellular and Molecular Biology and
| | - Xiaoying Jian
- From the Laboratory of Cellular and Molecular Biology and
| | | | - Kang Le
- Cardiovascular and Pulmonary Branch, NHLBI, National Institutes of Health, Bethesda, Maryland 20892
| | - Ruibai Luo
- From the Laboratory of Cellular and Molecular Biology and
| | | | | | - Joel Moss
- Cardiovascular and Pulmonary Branch, NHLBI, National Institutes of Health, Bethesda, Maryland 20892
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21
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Abstract
Mutant genes that underlie Mendelian forms of amyotrophic lateral sclerosis (ALS) and biochemical investigations of genetic disease models point to potential driver pathophysiological events involving endoplasmic reticulum (ER) stress and autophagy. Several steps in these cell biological processes are known to be controlled physiologically by small ADP-ribosylation factor (ARF) signaling. Here, we investigated the role of ARF guanine nucleotide exchange factors (GEFs), cytohesins, in models of ALS. Genetic or pharmacological inhibition of cytohesins protects motor neurons in vitro from proteotoxic insults and rescues locomotor defects in a Caenorhabditis elegans model of disease. Cytohesins form a complex with mutant superoxide dismutase 1 (SOD1), a known cause of familial ALS, but this is not associated with a change in GEF activity or ARF activation. ER stress evoked by mutant SOD1 expression is alleviated by antagonism of cytohesin activity. In the setting of mutant SOD1 toxicity, inhibition of cytohesin activity enhances autophagic flux and reduces the burden of misfolded SOD1. These observations suggest that targeting cytohesins may have potential benefits for the treatment of ALS.
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22
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Almli LM, Stevens JS, Smith AK, Kilaru V, Meng Q, Flory J, Abu-Amara D, Hammamieh R, Yang R, Mercer KB, Binder EB, Bradley B, Hamilton S, Jett M, Yehuda R, Marmar CR, Ressler KJ. A genome-wide identified risk variant for PTSD is a methylation quantitative trait locus and confers decreased cortical activation to fearful faces. Am J Med Genet B Neuropsychiatr Genet 2015; 168B:327-36. [PMID: 25988933 PMCID: PMC4844461 DOI: 10.1002/ajmg.b.32315] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 04/06/2015] [Indexed: 12/13/2022]
Abstract
Genetic factors appear to be highly relevant to predicting differential risk for the development of post-traumatic stress disorder (PTSD). In a discovery sample, we conducted a genome-wide association study (GWAS) for PTSD using a small military cohort (Systems Biology PTSD Biomarkers Consortium; SBPBC, N = 147) that was designed as a case-controlled sample of highly exposed, recently returning veterans with and without combat-related PTSD. A genome-wide significant single nucleotide polymorphism (SNP), rs717947, at chromosome 4p15 (N = 147, β = 31.34, P = 1.28 × 10(-8) ) was found to associate with the gold-standard diagnostic measure for PTSD (the Clinician Administered PTSD Scale). We conducted replication and follow-up studies in an external sample, a larger urban community cohort (Grady Trauma Project, GTP, N = 2006), to determine the robustness and putative functionality of this risk variant. In the GTP replication sample, SNP rs717947 associated with PTSD diagnosis in females (N = 2006, P = 0.005), but not males. SNP rs717947 was also found to be a methylation quantitative trait locus (meQTL) in the GTP replication sample (N = 157, P = 0.002). Further, the risk allele of rs717947 was associated with decreased medial and dorsolateral cortical activation to fearful faces (N = 53, P < 0.05) in the GTP replication sample. These data identify a genome-wide significant polymorphism conferring risk for PTSD, which was associated with differential epigenetic regulation and with differential cortical responses to fear in a replication sample. These results may provide new insight into understanding genetic and epigenetic regulation of PTSD and intermediate phenotypes that contribute to this disorder.
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Affiliation(s)
- Lynn M. Almli
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
| | - Jennifer S. Stevens
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
| | - Alicia K. Smith
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
| | - Varun Kilaru
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
| | - Qian Meng
- Department of Psychiatry, University Medical Center, New York, New York
| | - Janine Flory
- Mental Health Care Center, James J. Peters Veterans Affairs Medical Center, Bronx, New York/Traumatic Stress Studies Division, New York, New York
| | - Duna Abu-Amara
- Department of Psychiatry, New York University, Steven and Alexandra Cohen Veterans Center for Posttraumatic Stress and Traumatic Brain Injury, New York, New York
| | - Rasha Hammamieh
- Integrative Systems Biology, US Army Center for Environmental Health Research, Fort Detrick, Maryland
| | - Ruoting Yang
- Advanced Biomedical Computing Center, Frederick National Laboratory for Cancer Research/SAIC-Frederick Inc., Frederick, Maryland
| | - Kristina B. Mercer
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia
| | - Elizabeth B. Binder
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia,Department of Translational Research in Psychiatry, Max Planck Institute of Psychiatry, Munich, Germany
| | - Bekh Bradley
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia,Department of Veterans Affairs Medical Center, Clinical Psychologist, Mental Health Service Line, Atlanta, Georgia
| | - Steven Hamilton
- Department of Psychiatry, University of California, San Francisco, California
| | - Marti Jett
- Integrative Systems Biology, US Army Center for Environmental Health Research, Fort Detrick, Maryland
| | - Rachel Yehuda
- Mental Health Care Center, James J. Peters Veterans Affairs Medical Center, Bronx, New York/Traumatic Stress Studies Division, New York, New York
| | - Charles R. Marmar
- Department of Psychiatry, New York University, Steven and Alexandra Cohen Veterans Center for Posttraumatic Stress and Traumatic Brain Injury, New York, New York
| | - Kerry J. Ressler
- Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia,Howard Hughes Medical Institute, Chevy Chase, Maryland,Correspondence to: Kerry J. Ressler, M.D., Ph.D., Department of Psychiatry and Behavioral Sciences, Emory University, Atlanta, Georgia.
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23
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Whole exome sequencing in females with autism implicates novel and candidate genes. Int J Mol Sci 2015; 16:1312-35. [PMID: 25574603 PMCID: PMC4307305 DOI: 10.3390/ijms16011312] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 12/31/2014] [Indexed: 01/17/2023] Open
Abstract
Classical autism or autistic disorder belongs to a group of genetically heterogeneous conditions known as Autism Spectrum Disorders (ASD). Heritability is estimated as high as 90% for ASD with a recently reported compilation of 629 clinically relevant candidate and known genes. We chose to undertake a descriptive next generation whole exome sequencing case study of 30 well-characterized Caucasian females with autism (average age, 7.7 ± 2.6 years; age range, 5 to 16 years) from multiplex families. Genomic DNA was used for whole exome sequencing via paired-end next generation sequencing approach and X chromosome inactivation status. The list of putative disease causing genes was developed from primary selection criteria using machine learning-derived classification score and other predictive parameters (GERP2, PolyPhen2, and SIFT). We narrowed the variant list to 10 to 20 genes and screened for biological significance including neural development, function and known neurological disorders. Seventy-eight genes identified met selection criteria ranging from 1 to 9 filtered variants per female. Five females presented with functional variants of X-linked genes (IL1RAPL1, PIR, GABRQ, GPRASP2, SYTL4) with cadherin, protocadherin and ankyrin repeat gene families most commonly altered (e.g., CDH6, FAT2, PCDH8, CTNNA3, ANKRD11). Other genes related to neurogenesis and neuronal migration (e.g., SEMA3F, MIDN), were also identified.
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Chen PW, Luo R, Jian X, Randazzo PA. The Arf6 GTPase-activating proteins ARAP2 and ACAP1 define distinct endosomal compartments that regulate integrin α5β1 traffic. J Biol Chem 2014; 289:30237-30248. [PMID: 25225293 DOI: 10.1074/jbc.m114.596155] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Arf6 and the Arf6 GTPase-activating protein (GAP) ACAP1 are established regulators of integrin traffic important to cell adhesion and migration. However, the function of Arf6 with ACAP1 cannot explain the range of Arf6 effects on integrin-based structures. We propose that Arf6 has different functions determined, in part, by the associated Arf GAP. We tested this idea by comparing the Arf6 GAPs ARAP2 and ACAP1. We found that ARAP2 and ACAP1 had opposing effects on apparent integrin β1 internalization. ARAP2 knockdown slowed, whereas ACAP1 knockdown accelerated, integrin β1 internalization. Integrin β1 association with adaptor protein containing a pleckstrin homology (PH) domain, phosphotyrosine-binding (PTB) domain, and leucine zipper motif (APPL)-positive endosomes and EEA1-positive endosomes was affected by ARAP2 knockdown and depended on ARAP2 GAP activity. ARAP2 formed a complex with APPL1 and colocalized with Arf6 and APPL in a compartment distinct from the Arf6/ACAP1 tubular recycling endosome. In addition, although ACAP1 and ARAP2 each colocalized with Arf6, they did not colocalize with each other and had opposing effects on focal adhesions (FAs). ARAP2 overexpression promoted large FAs, but ACAP1 overexpression reduced FAs. Taken together, the data support a model in which Arf6 has at least two sites of opposing action defined by distinct Arf6 GAPs.
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Affiliation(s)
- Pei-Wen Chen
- Laboratory of Cellular and Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Ruibai Luo
- Laboratory of Cellular and Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Xiaoying Jian
- Laboratory of Cellular and Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892
| | - Paul A Randazzo
- Laboratory of Cellular and Molecular Biology, NCI, National Institutes of Health, Bethesda, Maryland 20892.
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Filamin A regulates neuronal migration through brefeldin A-inhibited guanine exchange factor 2-dependent Arf1 activation. J Neurosci 2013; 33:15735-46. [PMID: 24089482 DOI: 10.1523/jneurosci.1939-13.2013] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Periventricular heterotopias is a malformation of cortical development, characterized by ectopic neuronal nodules around ventricle lining and caused by an initial migration defect during early brain development. Human mutations in the Filamin A (FLNA) and ADP-ribosylation factor guanine exchange factor 2 [ARFGEF2; encoding brefeldin-A-inhibited guanine exchange factor-2 (BIG2)] genes give rise to this disorder. Previously, we have reported that Big2 inhibition impairs neuronal migration and binds to FlnA, and its loss promotes FlnA phosphorylation. FlnA phosphorylation dictates FlnA-actin binding affinity and consequently alters focal adhesion size and number to effect neuronal migration. Here we show that FlnA loss similarly impairs migration, reciprocally enhances Big2 expression, but also alters Big2 subcellular localization in both null and conditional FlnA mice. FlnA phosphorylation promotes relocalization of Big2 from the Golgi toward the lipid ruffles, thereby activating Big2-dependent Arf1 at the cell membrane. Loss of FlnA phosphorylation or Big2 function impairs Arf1-dependent vesicle trafficking at the periphery, and Arf1 is required for maintenance of cell-cell junction connectivity and focal adhesion assembly. Loss of Arf1 activity disrupts neuronal migration and cell adhesion. Collectively, these studies demonstrate a potential mechanism whereby coordinated interactions between actin (through FlnA) and vesicle trafficking (through Big2-Arf) direct the assembly and disassembly of membrane protein complexes required for neuronal migration and neuroependymal integrity.
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Cheung HNM, Dunbar C, Mórotz GM, Cheng WH, Chan HYE, Miller CCJ, Lau KF. FE65 interacts with ADP-ribosylation factor 6 to promote neurite outgrowth. FASEB J 2013; 28:337-49. [PMID: 24056087 DOI: 10.1096/fj.13-232694] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
FE65 is an adaptor protein that binds to the amyloid precursor protein (APP). As such, FE65 has been implicated in the pathogenesis of Alzheimer's disease. In addition, evidence suggests that FE65 is involved in brain development. It is generally believed that FE65 participates in these processes by recruiting various interacting partners to form functional complexes. Here, we show that via its first phosphotyrosine binding (PTB) domain, FE65 binds to the small GTPase ADP-ribosylation factor 6 (ARF6). FE65 preferentially binds to ARF6-GDP, and they colocalize in neuronal growth cones. Interestingly, FE65 stimulates the activation of both ARF6 and its downstream GTPase Rac1, a regulator of actin dynamics, and functions in growth cones to stimulate neurite outgrowth. We show that transfection of FE65 and/or ARF6 promotes whereas small interfering RNA knockdown of FE65 or ARF6 inhibits neurite outgrowth in cultured neurons as compared to the mock-transfected control cells. Moreover, knockdown of ARF6 attenuates FE65 stimulation of neurite outgrowth and defective neurite outgrowth seen in FE65-deficient neurons is partially corrected by ARF6 overexpression. Notably, the stimulatory effect of FE65 and ARF6 on neurite outgrowth is abrogated either by dominant-negative Rac1 or knockdown of Rac1. Thus, we identify FE65 as a novel regulator of neurite outgrowth via controlling ARF6-Rac1 signaling.
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Affiliation(s)
- Hei Nga Maggie Cheung
- 1School of Life Sciences, Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR, China.
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