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Vaishnav P, Kondo HS, Gadsby JR, Blake TCA, Dobramysl U, Mason J, Atherton J, Gallop JL. Membrane composition and curvature in SNX9-mediated actin polymerization. Mol Biol Cell 2025; 36:ar54. [PMID: 40105919 DOI: 10.1091/mbc.e24-09-0419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2025] Open
Abstract
Sorting nexin 9 (SNX9) is a membrane-binding scaffold protein that contributes to viral uptake and inflammation and is associated with worse outcomes in several cancers. It is involved in endocytosis of epidermal growth factor receptors, β1-integrin and membrane type 1 matrix metalloprotease, and formation of mitochondrial-derived vesicles. The SNX9 Bin-Amphiphysin-Rvs (BAR)-Phox homology (PX) domains bind phosphoinositide lipids and the Src homology 3 (SH3) domain interacts with dynamin and Neural-Wiskott Aldrich syndrome protein (N-WASP) to stimulate Arp2/3 complex-mediated actin polymerization. Here we use biolayer interferometry, cell-free reconstitution, and superresolution microscopy to analyze the specificity and activities of SNX9 at membranes. We find that more SNX9 can bind liposomes containing phosphatidylinositol (4,5)-bisphosphate (PI(4,5)P2) and phosphatidylinositol (3)-phosphate (PI(3)P) compared with phosphatidylinositol (3,4)-bisphosphate (PI(3,4)P2), despite similar affinities. Actin assembly requires the network of both PX-BAR and SH3 interactions. Three-dimensional direct stochastic optical reconstruction microscopy on filopodia-like reconstitutions shows that SNX9 and related protein transducer of Cdc42-dependent actin assembly-1 (TOCA-1) can form both flat and ∼0.5 µm curved assemblies at actin incorporation sites. Finally, using cryo-electron tomography, we show that SNX9 builds both branched and bundled actin networks demonstrating its potential for multifunctional roles in actin remodeling.
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Affiliation(s)
- Pankti Vaishnav
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Hanae Shimo Kondo
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Jonathan R Gadsby
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Thomas C A Blake
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Ulrich Dobramysl
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Julia Mason
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
| | - Joseph Atherton
- Randall Centre for Cell and Molecular Biophysics, King's College, London SE1 1YR, United Kingdom
| | - Jennifer L Gallop
- Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, United Kingdom
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, United Kingdom
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English LA, Taylor RJ, Cameron CJ, Broker EA, Dent EW. F-BAR proteins CIP4 and FBP17 function in cortical neuron radial migration and process outgrowth. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.10.25.620310. [PMID: 39484544 PMCID: PMC11527352 DOI: 10.1101/2024.10.25.620310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/03/2024]
Abstract
Neurite initiation from newly born neurons is a critical step in neuronal differentiation and migration. Neuronal migration in the developing cortex is accompanied by dynamic extension and retraction of neurites as neurons progress through bipolar and multipolar states. However, there is a relative lack of understanding regarding how the dynamic extension and retraction of neurites is regulated during neuronal migration. In recent work we have shown that CIP4, a member of the F-BAR family of membrane bending proteins, inhibits cortical neurite formation in culture, while family member FBP17 induces premature neurite outgrowth. These results beg the question of how CIP4 and FBP17 function in radial neuron migration and differentiation in vivo, including the timing and manner of neurite extension and retraction. Indeed, the regulation of neurite outgrowth is essential for the transitions between bipolar and multipolar states during radial migration. To examine the effects of modulating expression of CIP4 and FBP17 in vivo, we used in utero electroporation, in combination with our published Double UP technique, to compare knockdown or overexpression cells with control cells within the same mouse tissue of either sex. We show that either knockdown or overexpression of CIP4 and FBP17 results in the marked disruption of radial neuron migration by modulating neuronal morphology and neurite outgrowth, consistent with our findings in culture. Our results demonstrate that the F-BAR proteins CIP4 and FBP17 are essential for proper radial migration in the developing cortex and thus play a key role in cortical development.
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Affiliation(s)
- Lauren A English
- Neuroscience Training Program, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
| | - Russell J Taylor
- Neuroscience Department, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
| | - Connor J Cameron
- Neuroscience Department, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
| | - Emily A Broker
- Neuroscience Department, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
| | - Erik W Dent
- Neuroscience Department, School of Medicine and Public Health, University of Wisconsin, Madison, WI 53705
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Mallik B, Pippadpally S, Bisht A, Bhat S, Mukherjee S, Kumar V. Distinct Bin/Amphiphysin/Rvs (BAR) family proteins may assemble on the same tubule to regulate membrane organization in vivo. Heliyon 2024; 10:e33672. [PMID: 39040266 PMCID: PMC11261073 DOI: 10.1016/j.heliyon.2024.e33672] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2024] [Revised: 06/22/2024] [Accepted: 06/25/2024] [Indexed: 07/24/2024] Open
Abstract
Intracellular membrane tubules play a crucial role in diverse cellular processes, and their regulation is facilitated by Bin-Amphiphysin-Rvs (BAR) domain-containing proteins. This study investigates the roles of Drosophila ICA69 (dICA69) (an N-BAR protein) and Drosophila CIP4 (dCIP4) (an F-BAR protein), focusing on their impact on in vivo membrane tubule organization. In contrast to the prevailing models of BAR-domain protein function, we observed colocalization of endogenous dICA69 with dCIP4-induced tubules, indicating their potential recruitment for tubule formation and maintenance. Moreover, actin-regulatory proteins such as Wasp, SCAR, and Arp2/3 were recruited at the site of CIP4-induced tubule formation. An earlier study indicated that F-BAR proteins spontaneously segregate from the N-BAR domain proteins during membrane tubule formation. In contrast, our observation supports a model in which different BAR-domain family members can associate with the same tubule and cooperate to fine-tune the tubule width, possibly by recruiting actin modulators during the generation of tubules. Our data suggests that cooperative activities of distinct BAR-domain family proteins may determine the length and width of the membrane tubule in vivo.
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Affiliation(s)
| | | | | | - Sajad Bhat
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Indore bypass Road, Bhopal 462 066, Madhya Pradesh, India
| | - Surabhi Mukherjee
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Indore bypass Road, Bhopal 462 066, Madhya Pradesh, India
| | - Vimlesh Kumar
- Department of Biological Sciences, Indian Institute of Science Education and Research (IISER) Bhopal, Indore bypass Road, Bhopal 462 066, Madhya Pradesh, India
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Blake TCA, Fox HM, Urbančič V, Ravishankar R, Wolowczyk A, Allgeyer ES, Mason J, Danuser G, Gallop JL. Filopodial protrusion driven by density-dependent Ena-TOCA-1 interactions. J Cell Sci 2024; 137:jcs261057. [PMID: 38323924 PMCID: PMC11006392 DOI: 10.1242/jcs.261057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 01/29/2024] [Indexed: 02/08/2024] Open
Abstract
Filopodia are narrow actin-rich protrusions with important roles in neuronal development where membrane-binding adaptor proteins, such as I-BAR- and F-BAR-domain-containing proteins, have emerged as upstream regulators that link membrane interactions to actin regulators such as formins and proteins of the Ena/VASP family. Both the adaptors and their binding partners are part of diverse and redundant protein networks that can functionally compensate for each other. To explore the significance of the F-BAR domain-containing neuronal membrane adaptor TOCA-1 (also known as FNBP1L) in filopodia we performed a quantitative analysis of TOCA-1 and filopodial dynamics in Xenopus retinal ganglion cells, where Ena/VASP proteins have a native role in filopodial extension. Increasing the density of TOCA-1 enhances Ena/VASP protein binding in vitro, and an accumulation of TOCA-1, as well as its coincidence with Ena, correlates with filopodial protrusion in vivo. Two-colour single-molecule localisation microscopy of TOCA-1 and Ena supports their nanoscale association. TOCA-1 clusters promote filopodial protrusion and this depends on a functional TOCA-1 SH3 domain and activation of Cdc42, which we perturbed using the small-molecule inhibitor CASIN. We propose that TOCA-1 clusters act independently of membrane curvature to recruit and promote Ena activity for filopodial protrusion.
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Affiliation(s)
- Thomas C. A. Blake
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
| | - Helen M. Fox
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
| | - Vasja Urbančič
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
| | - Roshan Ravishankar
- Lyda Hill Department of Bioinformatics, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Adam Wolowczyk
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
| | - Edward S. Allgeyer
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Genetics, University of Cambridge, Cambridge CB2 3EH, UK
| | - Julia Mason
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
| | - Gaudenz Danuser
- Lyda Hill Department of Bioinformatics, UT Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jennifer L. Gallop
- Wellcome/Cancer Research UK Gurdon Institute, University of Cambridge, Cambridge CB2 1QN, UK
- Department of Biochemistry, University of Cambridge, Cambridge CB2 1QW, UK
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Yu Y, Yoshimura SH. Self-assembly of CIP4 drives actin-mediated asymmetric pit-closing in clathrin-mediated endocytosis. Nat Commun 2023; 14:4602. [PMID: 37528083 PMCID: PMC10393992 DOI: 10.1038/s41467-023-40390-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Accepted: 07/23/2023] [Indexed: 08/03/2023] Open
Abstract
Clathrin-mediated endocytosis is pivotal to signal transduction pathways between the extracellular environment and the intracellular space. Evidence from live-cell imaging and super-resolution microscopy of mammalian cells suggests an asymmetric distribution of actin fibres near the clathrin-coated pit, which induces asymmetric pit-closing rather than radial constriction. However, detailed molecular mechanisms of this 'asymmetricity' remain elusive. Herein, we used high-speed atomic force microscopy to demonstrate that CIP4, a multi-domain protein with a classic F-BAR domain and intrinsically disordered regions, is necessary for asymmetric pit-closing. Strong self-assembly of CIP4 via intrinsically disordered regions, together with stereospecific interactions with the curved membrane and actin-regulating proteins, generates a small actin-rich environment near the pit, which deforms the membrane and closes the pit. Our results provide mechanistic insights into how disordered and structured domain collaboration promotes spatio-temporal actin polymerisation near the plasma membrane.
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Affiliation(s)
- Yiming Yu
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8501, Japan
| | - Shige H Yoshimura
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8501, Japan.
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Mallik B, Bhat S, Kumar V. Role of Bin‐Amphiphysin‐Rvs (BAR) domain proteins in mediating neuronal signaling and disease. Synapse 2022; 76:e22248. [DOI: 10.1002/syn.22248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 05/13/2022] [Accepted: 07/18/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Bhagaban Mallik
- Department of Biological Sciences Indian Institute of Science Education and Research (IISER) Bhopal Indore Bypass Road Bhopal Madhya Pradesh 462 066 India
| | - Sajad Bhat
- Department of Biological Sciences Indian Institute of Science Education and Research (IISER) Bhopal Indore Bypass Road Bhopal Madhya Pradesh 462 066 India
| | - Vimlesh Kumar
- Department of Biological Sciences Indian Institute of Science Education and Research (IISER) Bhopal Indore Bypass Road Bhopal Madhya Pradesh 462 066 India
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Wu X, Wang LJ, Hou Y, Guo RY, Liu M, Yang L, Zhang JL. Different action mechanisms of low- and high-level quercetin in the brains of adult zebrafish (Danio rerio). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 223:112597. [PMID: 34365213 DOI: 10.1016/j.ecoenv.2021.112597] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Revised: 07/27/2021] [Accepted: 08/01/2021] [Indexed: 06/13/2023]
Abstract
Quercetin is reported to be beneficial to or pose hazards to the health of animals, the inconsistence remains to be recognized and debated. This work was conducted to understand the neuroprotective or neurotoxic properties of quercetin, and investigate the different action mechanisms between low- and high-level quercetin. Therefore, we evaluated brain oxidative stress and monoamine neurotransmitters in adult zebrafish (Danio rerio) after exposure to 1 and 1000 μg/L quercetin. In addition, the brain transcriptional profiles were analyzed to identify genes and pathways that were differentially regulated in the brains. The results of oxidative stress and neurotransmitters suggest that low-level quercetin might be beneficial to nervous system, while high-level quercetin might exert detrimental effects. Furthermore, transcriptional profiles also suggested different toxic mechanisms occurred between low- and high-level quercetin. At 1 μg/L quercetin, enrichment analysis of differently expressed genes (DEGs) revealed that the fanconi anemia pathway might be an important mechanism in neuroprotective effects. At 1000 μg/L quercetin, the up-regulated DEGs were enriched in many Gene Ontology (GO) terms related to neuronal synapses, indicating potential neuroprotective effects; however, enrichment of up-regulated DEGs in GO terms of response to stimulus and the MAPK signaling pathway was also found, which indicated increases of stress. Notably, at 1000 μg/L quercetin, the down-regulated DEGs were enriched in several GO terms related to the proteostasis and the proteasome pathway, indicating impairment of proteasome functions which was involved in neurodegenerative diseases. Moreover, several hub genes involved in the pathology of neurodegenerative diseases were identified by Protein-protein interaction analysis at 1000 μg/L quercetin. Thus, high-level quercetin might pose potential risk inducing neurodegenerative diseases, which should receive more attention in the future. Additionally, our findings may provide awareness to society and researchers about toxicity possibilities of phytochemicals on wildlife and human.
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Affiliation(s)
- Xia Wu
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, China
| | - Li-Jun Wang
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, China
| | - Yu Hou
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, China
| | - Rui-Ying Guo
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, China
| | - Min Liu
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China
| | - Li Yang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, Henan, China
| | - Ji-Liang Zhang
- Ministry of Education Key Laboratory for Ecology of Tropical Islands, Key Laboratory of Tropical Animal and Plant Ecology of Hainan Province, College of Life Sciences, Hainan Normal University, Haikou, Hainan, China.
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Recent developments in membrane curvature sensing and induction by proteins. Biochim Biophys Acta Gen Subj 2021; 1865:129971. [PMID: 34333084 DOI: 10.1016/j.bbagen.2021.129971] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 07/11/2021] [Accepted: 07/25/2021] [Indexed: 12/22/2022]
Abstract
BACKGROUND Membrane-bound intracellular organelles have characteristic shapes attributed to different local membrane curvatures, and these attributes are conserved across species. Over the past decade, it has been confirmed that specific proteins control the large curvatures of the membrane, whereas many others due to their specific structural features can sense the curvatures and bind to the specific geometrical cues. Elucidating the interplay between sensing and induction is indispensable to understand the mechanisms behind various biological processes such as vesicular trafficking and budding. SCOPE OF REVIEW We provide an overview of major classes of membrane proteins and the mechanisms of curvature sensing and induction. We then discuss the importance of membrane elastic characteristics to induce the membrane shapes similar to intracellular organelles. Finally, we survey recently available assays developed for studying the curvature sensing and induction by many proteins. MAJOR CONCLUSIONS Recent theoretical/computational modeling along with experimental studies have uncovered fascinating connections between lipid membrane and protein interactions. However, the phenomena of protein localization and synchronization to generate spatiotemporal dynamics in membrane morphology are yet to be fully understood. GENERAL SIGNIFICANCE The understanding of protein-membrane interactions is essential to shed light on various biological processes. This further enables the technological applications of many natural proteins/peptides in therapeutic treatments. The studies of membrane dynamic shapes help to understand the fundamental functions of membranes, while the medicinal roles of various macromolecules (such as proteins, peptides, etc.) are being increasingly investigated.
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Mahapatra A, Uysalel C, Rangamani P. The Mechanics and Thermodynamics of Tubule Formation in Biological Membranes. J Membr Biol 2021; 254:273-291. [PMID: 33462667 PMCID: PMC8184589 DOI: 10.1007/s00232-020-00164-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 12/11/2020] [Indexed: 02/07/2023]
Abstract
Membrane tubulation is a ubiquitous process that occurs both at the plasma membrane and on the membranes of intracellular organelles. These tubulation events are known to be mediated by forces applied on the membrane either due to motor proteins, by polymerization of the cytoskeleton, or due to the interactions between membrane proteins binding onto the membrane. The numerous experimental observations of tube formation have been amply supported by mathematical modeling of the associated membrane mechanics and have provided insights into the force-displacement relationships of membrane tubes. Recent advances in quantitative biophysical measurements of membrane-protein interactions and tubule formation have necessitated the need for advances in modeling that will account for the interplay of multiple aspects of physics that occur simultaneously. Here, we present a comprehensive review of experimental observations of tubule formation and provide context from the framework of continuum modeling. Finally, we explore the scope for future research in this area with an emphasis on iterative modeling and experimental measurements that will enable us to expand our mechanistic understanding of tubulation processes in cells.
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Affiliation(s)
- Arijit Mahapatra
- Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr, La Jolla, CA, 92093, USA
| | - Can Uysalel
- Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr, La Jolla, CA, 92093, USA
| | - Padmini Rangamani
- Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr, La Jolla, CA, 92093, USA.
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10
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Desale SE, Chinnathambi S. α-Linolenic acid induces clearance of Tau seeds via Actin-remodeling in Microglia. MOLECULAR BIOMEDICINE 2021; 2:4. [PMID: 35006402 PMCID: PMC8607384 DOI: 10.1186/s43556-021-00028-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2020] [Accepted: 01/14/2021] [Indexed: 12/16/2022] Open
Abstract
Alzheimer's disease (AD) is known by characteristic features, extracellular burden of amyloid-β and intracellular neuronal Tau. Microglia, the innate immune cell of the brain has the ability to clear the burden of accumulated proteins via phagocytosis. But the excessive proinflammatory cytokine production, altered cellular signaling and actin remodeling hampers the process of migration and phagocytosis by microglia. Actin remodeling is necessary to initiate the chemotactic migration of microglia towards the target and engulf it. The formation of lamellipodia, filopodia, membrane ruffling and rapid turnover of F-actin is necessary to sense the extracellular target by the cells. Omega-3 fatty acids, are known to impose anti-inflammatory phenotype of microglia by enhancing its ability for migration and phagocytosis. But the role of omega-3 fatty acids in cellular actin remodeling, which is the basis of cellular functions such as migration and phagocytosis, is not well understood. Here, we have focused on the effect of dietary supplement of α-linolenic acid (ALA) on extracellular Tau internalization and assisted actin polymerization for the process. ALA is found to induce membrane ruffling and phagocytic cup formation along with cytoskeletal rearrangement. ALA also enhances the localization of Arp2/3 complex at the leading edge and its colocalization with F-actin to induce the actin polymerization. The excessive actin polymerization might help the cell to protrude forward and perform its migration. The results suggest that dietary supplement of ALA could play a neuroprotective role and slow down the AD pathology.
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Affiliation(s)
- Smita Eknath Desale
- Neurobiology Group, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Subashchandrabose Chinnathambi
- Neurobiology Group, Division of Biochemical Sciences, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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11
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Su M, Zhuang Y, Miao X, Zeng Y, Gao W, Zhao W, Wu M. Comparative Study of Curvature Sensing Mediated by F-BAR and an Intrinsically Disordered Region of FBP17. iScience 2020; 23:101712. [PMID: 33205024 PMCID: PMC7649350 DOI: 10.1016/j.isci.2020.101712] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 09/11/2020] [Accepted: 10/16/2020] [Indexed: 12/19/2022] Open
Abstract
Membrane curvature has emerged as an intriguing physical principle underlying biological signaling and membrane trafficking. The CIP4/FBP17/Toca-1 F-BAR subfamily is unique in the BAR family because its structurally folded F-BAR domain does not contain any hydrophobic motifs that insert into membrane. Although widely assumed so, whether the banana-shaped F-BAR domain alone can sense curvature has never been experimentally demonstrated. Using a nanobar-supported lipid bilayer system, we found that the F-BAR domain of FBP17 displayed minimal curvature sensing in vitro. In comparison, an alternatively spliced intrinsically disordered region (IDR) adjacent to the F-BAR domain has the membrane curvature-sensing ability greatly exceeding that of F-BAR domain alone. In living cells, the presence of the IDR delayed the recruitment of FBP17 in curvature-coupled cortical waves. Collectively, we propose that contrary to the common belief, FBP17's curvature-sensing capability largely originates from IDR, and not the F-BAR domain alone.
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Affiliation(s)
- Maohan Su
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520-8002, USA.,Centre for BioImaging Sciences, Mechanobiology Institute, Department of Biological Sciences, National University of Singapore, Singapore, 117411
| | - Yinyin Zhuang
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520-8002, USA.,School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457
| | - Xinwen Miao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457
| | - Yongpeng Zeng
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457
| | - Weibo Gao
- School of Physics and Mathematical Science, Nanyang Technological University, Singapore, 637371
| | - Wenting Zhao
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, 637457
| | - Min Wu
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT 06520-8002, USA.,Centre for BioImaging Sciences, Mechanobiology Institute, Department of Biological Sciences, National University of Singapore, Singapore, 117411
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12
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Wu M, Liu J. Mechanobiology in cortical waves and oscillations. Curr Opin Cell Biol 2020; 68:45-54. [PMID: 33039945 DOI: 10.1016/j.ceb.2020.08.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/25/2020] [Accepted: 08/27/2020] [Indexed: 12/18/2022]
Abstract
Cortical actin waves have emerged as a widely prevalent phenomena and brought pattern formation to many fields of cell biology. Cortical excitabilities, reminiscent of the electric excitability in neurons, are likely fundamental property of the cell cortex. Although they have been mostly considered to be biochemical in nature, accumulating evidence support the role of mechanics in the pattern formation process. Both pattern formation and mechanobiology approach biological phenomena at the collective level, either by looking at the mesoscale dynamical behavior of molecular networks or by using collective physical properties to characterize biological systems. As such they are very different from the traditional reductionist, bottom-up view of biology, which brings new challenges and potential opportunities. In this essay, we aim to provide our perspectives on what the proposed mechanochemical feedbacks are and open questions regarding their role in cortical excitable and oscillatory dynamics.
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Affiliation(s)
- Min Wu
- Department of Cell Biology, Yale University School of Medicine, 333 Cedar Street, New Haven, CT, 06520-8002, USA..
| | - Jian Liu
- Department of Cell Biology, School of Medicine, Johns Hopkins University, 855 N Wolfe Street, Baltimore, MD, 21025, USA
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13
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Kessels MM, Qualmann B. Interplay between membrane curvature and the actin cytoskeleton. Curr Opin Cell Biol 2020; 68:10-19. [PMID: 32927373 DOI: 10.1016/j.ceb.2020.08.008] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 08/10/2020] [Accepted: 08/11/2020] [Indexed: 12/26/2022]
Abstract
An intimate interplay of the plasma membrane with curvature-sensing and curvature-inducing proteins would allow for defining specific sites or nanodomains of action at the plasma membrane, for example, for protrusion, invagination, and polarization. In addition, such connections are predestined to ensure spatial and temporal order and sequences. The combined forces of membrane shapers and the cortical actin cytoskeleton might hereby in particular be required to overcome the strong resistance against membrane rearrangements in case of high plasma membrane tension or cellular turgor. Interestingly, also the opposite might be necessary, the inhibition of both membrane shapers and cytoskeletal reinforcement structures to relieve membrane tension to protect cells from membrane damage and rupturing during mechanical stress. In this review article, we discuss recent conceptual advances enlightening the interplay of plasma membrane curvature and the cortical actin cytoskeleton during endocytosis, modulations of membrane tensions, and the shaping of entire cells.
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Affiliation(s)
- Michael M Kessels
- Institute of Biochemistry I, Jena University Hospital, Friedrich Schiller University Jena, Nonnenplan 2-4, 07743, Jena, Germany
| | - Britta Qualmann
- Institute of Biochemistry I, Jena University Hospital, Friedrich Schiller University Jena, Nonnenplan 2-4, 07743, Jena, Germany.
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Jones T, Liu A, Cui B. Light-Inducible Generation of Membrane Curvature in Live Cells with Engineered BAR Domain Proteins. ACS Synth Biol 2020; 9:893-901. [PMID: 32212723 DOI: 10.1021/acssynbio.9b00516] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Nanoscale membrane curvature is now understood to play an active role in essential cellular processes such as endocytosis, exocytosis, and actin dynamics. Previous studies have shown that membrane curvature can directly affect protein function and intracellular signaling. However, few methods are able to precisely manipulate membrane curvature in live cells. Here, we report the development of a new method of generating nanoscale membrane curvature in live cells that is controllable, reversible, and capable of precise spatial and temporal manipulation. For this purpose, we make use of Bin/Amphiphysin/Rvs (BAR) domain proteins, a family of well-studied membrane-remodeling and membrane-sculpting proteins. Specifically, we engineered two optogenetic systems, opto-FBAR and opto-IBAR, that allow light-inducible formation of positive and negative membrane curvature, respectively. Using opto-FBAR, blue light activation results in the formation of tubular membrane invaginations (positive curvature), controllable down to the subcellular level. Using opto-IBAR, blue light illumination results in the formation of membrane protrusions or filopodia (negative curvature). These systems present a novel approach for light-inducible manipulation of nanoscale membrane curvature in live cells.
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Affiliation(s)
- Taylor Jones
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Aofei Liu
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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