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Yang Y, Valencia LA, Lu CH, Nakamoto ML, Tsai CT, Liu C, Yang H, Zhang W, Jahed Z, Lee WR, Santoro F, Liou J, Wu JC, Cui B. Plasma membrane curvature regulates the formation of contacts with the endoplasmic reticulum. Nat Cell Biol 2024; 26:1878-1891. [PMID: 39289582 PMCID: PMC11567891 DOI: 10.1038/s41556-024-01511-x] [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: 11/20/2023] [Accepted: 08/19/2024] [Indexed: 09/19/2024]
Abstract
Contact sites between the endoplasmic reticulum (ER) and plasma membrane (PM) play a crucial role in governing calcium regulation and lipid homeostasis. Despite their significance, the factors regulating their spatial distribution on the PM remain elusive. Inspired by observations in cardiomyocytes, where ER-PM contact sites concentrate on tubular PM invaginations known as transverse tubules, we hypothesize that PM curvature plays a role in ER-PM contact formation. Through precise control of PM invaginations, we show that PM curvatures locally induce the formation of ER-PM contacts in cardiomyocytes. Intriguingly, the junctophilin family of ER-PM tethering proteins, specifically expressed in excitable cells, is the key player in this process, whereas the ubiquitously expressed extended synaptotagmin-2 does not show a preference for PM curvature. At the mechanistic level, we find that the low-complexity region (LCR) and membrane occupation and recognition nexus (MORN) motifs of junctophilins can bind independently to the PM, but both the LCR and MORN motifs are required for targeting PM curvatures. By examining the junctophilin interactome, we identify a family of curvature-sensing proteins-Eps15 homology domain-containing proteins-that interact with the MORN_LCR motifs and facilitate the preferential tethering of junctophilins to curved PM. These findings highlight the pivotal role of PM curvature in the formation of ER-PM contacts in cardiomyocytes and unveil a mechanism for the spatial regulation of ER-PM contacts through PM curvature modulation.
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Affiliation(s)
- Yang Yang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Luis A Valencia
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Chih-Hao Lu
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Melissa L Nakamoto
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Ching-Ting Tsai
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Chun Liu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Departments of Physiology and Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Huaxiao Yang
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department of Biomedical Engineering, University of North Texas, Denton, TX, USA
| | - Wei Zhang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA
| | - Zeinab Jahed
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Department of Chemical and Nano Engineering, University of California, San Diego, San Diego, CA, USA
| | - Wan-Ru Lee
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Francesca Santoro
- Tissue Electronics, Istituto Italiano di Tecnologia, Naples, Italy
- Faculty of Electrical Engineering and Information Technology, RWTH Aachen University, Aachen, Germany
- Institute of Biological Information Processing-Bioelectronics (IBI-3), Forschungszentrum, Jülich, Germany
| | - Jen Liou
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Joseph C Wu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department of Medicine, Division of Cardiology, Stanford University, Stanford, CA, USA
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, Stanford, CA, USA.
- Wu Tsai Neurosciences Institute and ChEM-H Institute, Stanford University, Stanford, CA, USA.
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2
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Adekeye TE, Teets EM, Tomak EA, Waterman SL, Sprague KA, White A, Coffin ML, Varga SM, Easterbrooks TE, Shepherd SJ, Austin JD, Krivorotko D, Hupper TE, Kelley JB, Amacher SL, Talbot JC. Fast-twitch myofibrils grow in proportion to Mylpf dosage in the zebrafish embryo. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.09.18.613721. [PMID: 39345555 PMCID: PMC11429778 DOI: 10.1101/2024.09.18.613721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
Abstract
Muscle cells become stronger by expanding myofibrils, the chains of sarcomeres that produce contraction. Here we investigate how Mylpf (Myosin Light Chain Phosphorylatable Fast) abundance impacts myofibril assembly in fast-twitch muscle. The two zebrafish Mylpf genes (mylpfa and mylpfb) are exclusively expressed in fast-twitch muscle. We show that these cells initially produce six times more mylpfa mRNA and protein than mylpfb. The combined Mylpf protein dosage is necessary for and proportionate to fast-twitch myofibril growth in the embryo. Fast-twitch myofibrils are severely reduced in the mylpfa -/- mutant, leading to loss of high-speed movement; however, by persistent slow movement this mutant swims as far through time as its wild-type sibling. Although the mylpfb -/- mutant has normal myofibrils, myofibril formation fails entirely in the mylpfa -/- ;mylpfb -/- double mutant, indicating that the two genes are collectively essential to myofibril formation. Fast-twitch myofibril width is restored in the mylpfa -/- mutant by transgenic expression of mylpfa-GFP, mylpfb-GFP, and by human MYLPF-GFP to a degree corresponding linearly with GFP brightness. This correlate is inverted by expression of MYLPF alleles that cause Distal Arthrogryposis, which reduce myofibril size in proportion to protein abundance. These effects indicate that Mylpf dosage controls myofibril growth, impacting embryonic development and lifelong health.
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Affiliation(s)
- Tayo E Adekeye
- School of Biology and Ecology, the University of Maine, 04469, USA
| | - Emily M Teets
- Molecular Genetics, The Ohio State University, 43210, USA
| | - Emily A Tomak
- School of Biology and Ecology, the University of Maine, 04469, USA
| | - Sadie L Waterman
- School of Biology and Ecology, the University of Maine, 04469, USA
| | - Kailee A Sprague
- School of Biology and Ecology, the University of Maine, 04469, USA
| | - Angelina White
- School of Biology and Ecology, the University of Maine, 04469, USA
| | | | - Sabrina M Varga
- School of Biology and Ecology, the University of Maine, 04469, USA
| | | | | | - Jared D Austin
- School of Biology and Ecology, the University of Maine, 04469, USA
| | | | - Troy E Hupper
- School of Biology and Ecology, the University of Maine, 04469, USA
| | - Joshua B Kelley
- Molecular and Biomedical Sciences, the University of Maine, 04469, USA
| | - Sharon L Amacher
- Departments of Molecular Genetics and Biological Chemistry and Pharmacology, The Ohio State University, 43210, USA
| | - Jared C Talbot
- School of Biology and Ecology, the University of Maine, 04469, USA
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3
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Yang Y, Valencia LA, Lu CH, Nakamoto ML, Tsai CT, Liu C, Yang H, Zhang W, Jahed Z, Lee WR, Santoro F, Liou J, Wu JC, Cui B. Membrane Curvature Promotes ER-PM Contact Formation via Junctophilin-EHD Interactions. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.06.29.601287. [PMID: 38979311 PMCID: PMC11230412 DOI: 10.1101/2024.06.29.601287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/10/2024]
Abstract
Contact sites between the endoplasmic reticulum (ER) and the plasma membrane (PM) play a crucial role in governing calcium regulation and lipid homeostasis. Despite their significance, the factors regulating their spatial distribution on the PM remain elusive. Inspired by observations in cardiomyocytes, where ER-PM contact sites concentrate on tubular PM invaginations known as transverse tubules (T-tubules), we hypothesize that the PM curvature plays a role in ER-PM contact formation. Through precise control of PM invaginations, we show that PM curvatures locally induce the formation of ER-PM contacts in cardiomyocytes. Intriguingly, the junctophilin family of ER-PM tethering proteins, specifically expressed in excitable cells, is the key player in this process, while the ubiquitously expressed extended synaptotagmin 2 does not show a preference for PM curvature. At the mechanistic level, we find that the low complexity region (LCR) and the MORN motifs of junctophilins can independently bind to the PM, but both the LCR and MORN motifs are required for targeting PM curvatures. By examining the junctophilin interactome, we identify a family of curvature-sensing proteins, Eps15-homology domain containing proteins (EHDs), that interact with the MORN_LCR motifs and facilitate junctophilins' preferential tethering to curved PM. These findings highlight the pivotal role of PM curvature in the formation of ER-PM contacts in cardiomyocytes and unveil a novel mechanism for the spatial regulation of ER-PM contacts through PM curvature modulation.
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Affiliation(s)
- Yang Yang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Luis A. Valencia
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Chih-Hao Lu
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Melissa L. Nakamoto
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Ching-Ting Tsai
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Chun Liu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Present address: Department of Physiology and Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Huaxiao Yang
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Present address: Department of Biomedical Engineering, University of North Texas, Denton, TX, USA
| | - Wei Zhang
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
| | - Zeinab Jahed
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Present address: Department of Nanoengineering, Jacobs School of Engineering, University of California, San Diego, CA, USA
| | - Wan-Ru Lee
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Francesca Santoro
- Tissue Electronics, Istituto Italiano di Tecnologia, 80125 Naples, Italy
- Faculty of Electrical Engineering and IT, RWTH, Aachen 52074, Germany
- Institute of Biological Information Processing—Bioelectronics, IBI-3, Forschungszentrum, Juelich 52428, Germany
| | - Jen Liou
- Department of Physiology, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Joseph C. Wu
- Stanford Cardiovascular Institute, Stanford University, Stanford, CA, USA
- Department of Medicine (Division of Cardiology), Stanford University, Stanford, CA, USA
- Department of Radiology, Stanford University, Stanford, CA, USA
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, Stanford, CA, USA
- Wu-Tsai Neuroscience Institute and ChEM-H Institute, Stanford University; Stanford, CA, USA
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4
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Bhattacharyya S, Pucadyil TJ. Dynamics of membrane tubulation coupled with fission by a two-component module. Proc Natl Acad Sci U S A 2024; 121:e2402180121. [PMID: 38717859 PMCID: PMC11098101 DOI: 10.1073/pnas.2402180121] [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: 01/31/2024] [Accepted: 04/05/2024] [Indexed: 05/18/2024] Open
Abstract
Membrane tubulation coupled with fission (MTCF) is a widespread phenomenon but mechanisms for their coordination remain unclear, partly because of the lack of assays to monitor dynamics of membrane tubulation and subsequent fission. Using polymer cushioned bilayer islands, we analyze the membrane tubulator Bridging Integrator 1 (BIN1) mixed with the fission catalyst dynamin2 (Dyn2). Our results reveal this mixture to constitute a minimal two-component module that demonstrates MTCF. MTCF is an emergent property and arises because BIN1 facilitates recruitment but inhibits membrane binding of Dyn2 in a dose-dependent manner. MTCF is therefore apparent only at high Dyn2 to BIN1 ratios. Because of their mutual involvement in T-tubules biogenesis, mutations in BIN1 and Dyn2 are associated with centronuclear myopathies and our analysis links the pathology with aberrant MTCF. Together, our results establish cushioned bilayer islands as a facile template for the analysis of membrane tubulation and inform of mechanisms that coordinate MTCF.
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Affiliation(s)
- Soumya Bhattacharyya
- Indian Institute of Science Education and Research, Pashan, Pune411008, Maharashtra, India
| | - Thomas J. Pucadyil
- Indian Institute of Science Education and Research, Pashan, Pune411008, Maharashtra, India
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5
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Jones TLM, Woulfe KC. Considering impact of age and sex on cardiac cytoskeletal components. Am J Physiol Heart Circ Physiol 2024; 326:H470-H478. [PMID: 38133622 PMCID: PMC11219061 DOI: 10.1152/ajpheart.00619.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 12/08/2023] [Accepted: 12/21/2023] [Indexed: 12/23/2023]
Abstract
The cardiac cytoskeletal components are integral to cardiomyocyte function and are responsible for contraction, sustaining cell structure, and providing scaffolding to direct signaling. Cytoskeletal components have been implicated in cardiac pathology; however, less attention has been paid to age-related modifications of cardiac cytoskeletal components and how these contribute to dysfunction with increased age. Moreover, significant sex differences in cardiac aging have been identified, but we still lack a complete understanding to the mechanisms behind these differences. This review summarizes what is known about how key cardiomyocyte cytoskeletal components are modified because of age, as well as reported sex-specific differences. Thorough consideration of both age and sex as integral players in cytoskeletal function may reveal potential avenues for more personalized therapeutics.
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Affiliation(s)
- Timothy L M Jones
- Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States
| | - Kathleen C Woulfe
- Division of Cardiology, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, United States
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6
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Nonarath HJT, Simpson SL, Slobodianuk TL, Collery RF, Dinculescu A, Link BA. The USH3A causative gene clarin1 functions in Müller glia to maintain retinal photoreceptors. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.02.29.582878. [PMID: 38464015 PMCID: PMC10925332 DOI: 10.1101/2024.02.29.582878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/12/2024]
Abstract
Mutations in CLRN1 cause Usher syndrome type IIIA (USH3A), an autosomal recessive disorder characterized by hearing and vision loss, and often accompanied by vestibular balance issues. The identity of the cell types responsible for the pathology and mechanisms leading to vision loss in USH3A remains elusive. To address this, we employed CRISPR/Cas9 technology to delete a large region in the coding and untranslated (UTR) region of zebrafish clrn1. Retina of clrn1 mutant larvae exhibited sensitivity to cell stress, along with age-dependent loss of function and degeneration in the photoreceptor layer. Investigation revealed disorganization in the outer retina in clrn1 mutants, including actin-based structures of the Müller glia and photoreceptor cells. To assess cell-specific contributions to USH3A pathology, we specifically re-expressed clrn1 in either Müller glia or photoreceptor cells. Müller glia re-expression of clrn1 prevented the elevated cell death observed in larval clrn1 mutant zebrafish exposed to high-intensity light. Notably, the degree of phenotypic rescue correlated with the level of Clrn1 re-expression. Surprisingly, high levels of Clrn1 expression enhanced cell death in both wild-type and clrn1 mutant animals. However, rod- or cone-specific Clrn1 re-expression did not rescue the extent of cell death. Taken together, our findings underscore three crucial insights. First, clrn1 mutant zebrafish exhibit key pathological features of USH3A; second, Clrn1 within Müller glia plays a pivotal role in photoreceptor maintenance, with its expression requiring controlled regulation; third, the reliance of photoreceptors on Müller glia suggests a structural support mechanism, possibly through direct interactions between Müller glia and photoreceptors mediated in part by Clrn1 protein.
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Affiliation(s)
- Hannah J. T. Nonarath
- Department Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
| | - Samantha L. Simpson
- Department of Ophthalmology and Vision Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
| | - Tricia L. Slobodianuk
- Department Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
| | - Ross F. Collery
- Department of Ophthalmology and Vision Sciences, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
| | - Astra Dinculescu
- Department of Ophthalmology, University of Florida, Gainesville, Florida 32611
| | - Brian A. Link
- Department Cell Biology, Neurobiology and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin 53226
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7
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Kawaguchi K, Fujita N. Shaping transverse-tubules: central mechanisms that play a role in the cytosol zoning for muscle contraction. J Biochem 2024; 175:125-131. [PMID: 37848047 PMCID: PMC10873525 DOI: 10.1093/jb/mvad083] [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: 08/28/2023] [Revised: 10/05/2023] [Accepted: 10/11/2023] [Indexed: 10/19/2023] Open
Abstract
A transverse-tubule (T-tubule) is an invagination of the plasma membrane penetrating deep into muscle cells. An extensive membrane network of T-tubules is crucial for rapid and synchronized signal transmission from the cell surface to the entire sarcoplasmic reticulum for Ca2+ release, leading to muscle contraction. T-tubules are also indispensable for the formation and positioning of other muscle organelles. Their structure and physiological roles are relatively well established; however, the mechanisms shaping T-tubules require further elucidation. Centronuclear myopathy (CNM), an inherited muscular disorder, accompanies structural defects in T-tubules. Membrane traffic-related genes, including MTM1 (Myotubularin 1), DNM2 (Dynamin 2), and BIN1 (Bridging Integrator-1), were identified as causative genes of CNM. In addition, causative genes for other muscle diseases are also reported to be involved in the formation and maintenance of T-tubules. This review summarizes current knowledge on the mechanisms of how T-tubule formation and maintenance is regulated.
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Affiliation(s)
- Kohei Kawaguchi
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, 4259 S2-11 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
| | - Naonobu Fujita
- Cell Biology Center, Institute of Innovative Research, Tokyo Institute of Technology, 4259 S2-11 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
- Graduate School of Life Science and Technology, Tokyo Institute of Technology, 4259 S2-11 Nagatsuta-cho, Midori-ku, Yokohama 226-8503, Japan
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8
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Štefl M, Takamiya M, Middel V, Tekpınar M, Nienhaus K, Beil T, Rastegar S, Strähle U, Nienhaus GU. Caveolae disassemble upon membrane lesioning and foster cell survival. iScience 2024; 27:108849. [PMID: 38303730 PMCID: PMC10831942 DOI: 10.1016/j.isci.2024.108849] [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: 06/26/2023] [Revised: 11/22/2023] [Accepted: 01/03/2024] [Indexed: 02/03/2024] Open
Abstract
Repair of lesions in the plasma membrane is key to sustaining cellular homeostasis. Cells maintain cytoplasmic as well as membrane-bound stores of repair proteins that can rapidly precipitate at the site of membrane lesions. However, little is known about the origins of lipids and proteins for resealing and repair of the plasma membrane. Here we study the dynamics of caveolar proteins after laser-induced lesioning of plasma membranes of mammalian C2C12 tissue culture cells and muscle cells of intact zebrafish embryos. Single-molecule diffusivity measurements indicate that caveolar clusters break up into smaller entities after wounding. Unlike Annexins and Dysferlin, caveolar proteins do not accumulate at the lesion patch. In caveolae-depleted cavin1a knockout zebrafish embryos, lesion patch formation is impaired, and injured cells show reduced survival. Our data suggest that caveolae disassembly releases surplus plasma membrane near the lesion to facilitate membrane repair after initial patch formation for emergency sealing.
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Affiliation(s)
- Martin Štefl
- Institute of Applied Physics (APH), Karlsruhe Institute of Technology (KIT), Wolfgang Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Masanari Takamiya
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
| | - Volker Middel
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
| | - Miyase Tekpınar
- Institute of Applied Physics (APH), Karlsruhe Institute of Technology (KIT), Wolfgang Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Karin Nienhaus
- Institute of Applied Physics (APH), Karlsruhe Institute of Technology (KIT), Wolfgang Gaede-Strasse 1, 76131 Karlsruhe, Germany
| | - Tanja Beil
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
| | - Sepand Rastegar
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
| | - Uwe Strähle
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
- Centre for Organismal Studies (COS), Heidelberg University, Im Neuenheimer Feld 230, 69120 Heidelberg, Germany
| | - Gerd Ulrich Nienhaus
- Institute of Applied Physics (APH), Karlsruhe Institute of Technology (KIT), Wolfgang Gaede-Strasse 1, 76131 Karlsruhe, Germany
- Institute of Biological and Chemical Systems (IBCS), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
- Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), PO Box 3640, 76021 Karlsruhe, Germany
- Department of Physics, University of Illinois at Urbana−Champaign, Urbana, IL 61801, USA
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9
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Fujita N, Girada S, Vogler G, Bodmer R, Kiger AA. PI(4,5)P 2 role in Transverse-tubule membrane formation and muscle function. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.01.31.578124. [PMID: 38352484 PMCID: PMC10862868 DOI: 10.1101/2024.01.31.578124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/20/2024]
Abstract
Transverse (T)-tubules - vast, tubulated domains of the muscle plasma membrane - are critical to maintain healthy skeletal and heart contractions. How the intricate T-tubule membranes are formed is not well understood, with challenges to systematically interrogate in muscle. We established the use of intact Drosophila larval body wall muscles as an ideal system to discover mechanisms that sculpt and maintain the T-tubule membrane network. A muscle-targeted genetic screen identified specific phosphoinositide lipid regulators necessary for T-tubule organization and muscle function. We show that a PI4KIIIα - Skittles/PIP5K pathway is needed for T-tubule localized PI(4)P to PI(4,5)P 2 synthesis, T-tubule organization, calcium regulation, and muscle and heart rate functions. Muscles deficient for PI4KIIIα or Amphiphysin , the homolog of human BIN1 , similarly exhibited specific loss of transversal T-tubule membranes and dyad junctions, yet retained longitudinal membranes and the associated dyads. Our results highlight the power of live muscle studies, uncovering distinct mechanisms and functions for sub-compartments of the T-tubule network relevant to human myopathy. Summary T-tubules - vast, tubulated domains of the muscle plasma membrane - are critical to maintain skeletal and heart contractions. Fujita et al . establish genetic screens and assays in intact Drosophila muscles that uncover PI(4,5)P 2 regulation critical for T-tubule maintenance and function. Key Findings PI4KIIIα is required for muscle T-tubule formation and larval mobility. A PI4KIIIα-Sktl pathway promotes PI(4)P and PI(4,5)P 2 function at T-tubules. PI4KIIIα is necessary for calcium dynamics and transversal but not longitudinal dyads. Disruption of PI(4,5)P 2 function in fly heart leads to fragmented T-tubules and abnormal heart rate.
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10
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Fordjour FK, Abuelreich S, Hong X, Chatterjee E, Lallai V, Ng M, Saftics A, Deng F, Carnel-Amar N, Wakimoto H, Shimizu K, Bautista M, Phu TA, Vu NK, Geiger PC, Raffai RL, Fowler CD, Das S, Christenson LK, Jovanovic-Talisman T, Gould SJ. Exomap1 mouse: A transgenic model for in vivo studies of exosome biology. EXTRACELLULAR VESICLE 2023; 2:100030. [PMID: 39372847 PMCID: PMC11450736 DOI: 10.1016/j.vesic.2023.100030] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/08/2024]
Abstract
Exosomes are small extracellular vesicles (sEVs) of ~30-150 nm in diameter that are enriched in exosome marker proteins and play important roles in health and disease. To address large unanswered questions regarding exosome biology in vivo, we created the Exomap1 transgenic mouse, which in response to Cre recombinase expresses the most highly enriched exosomal marker protein known, human CD81, fused to mNeonGreen (HsCD81mNG), and prior to Cre expresses a mitochondrial red fluorescent protein. Validation of the exomap1 mouse with eight distinct Cre drivers demonstrated that HsCD81mNG was expressed only in response to Cre, that murine cells correctly localized HsCD81mNG to the plasma membrane, and that this led to the secretion of HsCD81mNG in EVs that had the size (~70-80 nm), topology, and composition of exosomes. Furthermore, cell type-specific activation of the exomap1 transgene allowed us to use quantitative single molecule localization microscopy to calculate the cell type-specific contribution to biofluid exosome populations. Specifically, we show that neurons contribute ~1% to plasma and cerebrospinal fluid exosome populations whereas hepatocytes contribute ~15% to plasma exosome populations, numbers that reflect the known vascular permeabilities of brain and liver. These observations validate the use of Exomap1 mouse models for in vivo studies of exosome biology.
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Affiliation(s)
- Francis K. Fordjour
- Department of Biological Chemistry, Johns Hopkins University, Baltimore, MD, 21205, USA
| | - Sarah Abuelreich
- Department of Cancer Biology and Molecular Medicine, Beckman Research Institute, City of Hope, Duarte, CA, 91010, USA
| | - Xiaoman Hong
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Emeli Chatterjee
- Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Valeria Lallai
- Department of Neurobiology & Behavior, University of California Irvine, Irvine, CA, 92697, USA
| | - Martin Ng
- Northern California Institute for Research and Education, San Francisco, CA, 94121, USA
| | - Andras Saftics
- Department of Cancer Biology and Molecular Medicine, Beckman Research Institute, City of Hope, Duarte, CA, 91010, USA
| | - Fengyan Deng
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Natacha Carnel-Amar
- Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Hiroaki Wakimoto
- Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - Kazuhide Shimizu
- Department of Neurosurgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, 02114, USA
| | - Malia Bautista
- Department of Neurobiology & Behavior, University of California Irvine, Irvine, CA, 92697, USA
| | - Tuan Anh Phu
- Northern California Institute for Research and Education, San Francisco, CA, 94121, USA
| | - Ngan K. Vu
- Northern California Institute for Research and Education, San Francisco, CA, 94121, USA
| | - Paige C. Geiger
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Robert L. Raffai
- Northern California Institute for Research and Education, San Francisco, CA, 94121, USA
- Department of Veterans Affairs, Surgical Service (112G), San Francisco VA Medical Center, San Francisco, CA, 94121, USA
- Department of Surgery, Division of Vascular and Endovascular Surgery, University of California, San Francisco, CA, 94143, USA
| | - Christie D. Fowler
- Department of Neurobiology & Behavior, University of California Irvine, Irvine, CA, 92697, USA
| | - Saumya Das
- Cardiovascular Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA
| | - Lane K. Christenson
- Department of Cell Biology and Physiology, University of Kansas Medical Center, Kansas City, KS, 66160, USA
| | - Tijana Jovanovic-Talisman
- Department of Cancer Biology and Molecular Medicine, Beckman Research Institute, City of Hope, Duarte, CA, 91010, USA
| | - Stephen J. Gould
- Department of Biological Chemistry, Johns Hopkins University, Baltimore, MD, 21205, USA
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11
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Shrestha R, McCann T, Saravanan H, Lieberth J, Koirala P, Bloomekatz J. The myocardium utilizes a platelet-derived growth factor receptor alpha (Pdgfra)-phosphoinositide 3-kinase (PI3K) signaling cascade to steer toward the midline during zebrafish heart tube formation. eLife 2023; 12:e85930. [PMID: 37921445 PMCID: PMC10651176 DOI: 10.7554/elife.85930] [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: 01/13/2023] [Accepted: 11/02/2023] [Indexed: 11/04/2023] Open
Abstract
Coordinated cell movement is a fundamental process in organ formation. During heart development, bilateral myocardial precursors collectively move toward the midline (cardiac fusion) to form the primitive heart tube. Extrinsic influences such as the adjacent anterior endoderm are known to be required for cardiac fusion. We previously showed however, that the platelet-derived growth factor receptor alpha (Pdgfra) is also required for cardiac fusion (Bloomekatz et al., 2017). Nevertheless, an intrinsic mechanism that regulates myocardial movement has not been elucidated. Here, we show that the phosphoinositide 3-kinase (PI3K) intracellular signaling pathway has an essential intrinsic role in the myocardium directing movement toward the midline. In vivo imaging further reveals midline-oriented dynamic myocardial membrane protrusions that become unpolarized in PI3K-inhibited zebrafish embryos where myocardial movements are misdirected and slower. Moreover, we find that PI3K activity is dependent on and interacts with Pdgfra to regulate myocardial movement. Together our findings reveal an intrinsic myocardial steering mechanism that responds to extrinsic cues during the initiation of cardiac development.
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Affiliation(s)
- Rabina Shrestha
- Department of Biology, University of MississippiUniversityUnited States
| | - Tess McCann
- Department of Biology, University of MississippiUniversityUnited States
| | - Harini Saravanan
- Department of Biology, University of MississippiUniversityUnited States
| | - Jaret Lieberth
- Department of Biology, University of MississippiUniversityUnited States
| | - Prashanna Koirala
- Department of Biology, University of MississippiUniversityUnited States
| | - Joshua Bloomekatz
- Department of Biology, University of MississippiUniversityUnited States
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12
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Horvath JD, Casas M, Kutchukian C, Sánchez SC, Pergande MR, Cologna SM, Simó S, Dixon RE, Dickson EJ. α-Synuclein-dependent increases in PIP5K1γ drive inositol signaling to promote neurotoxicity. Cell Rep 2023; 42:113244. [PMID: 37838947 PMCID: PMC11010634 DOI: 10.1016/j.celrep.2023.113244] [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: 01/31/2023] [Revised: 08/09/2023] [Accepted: 09/25/2023] [Indexed: 10/17/2023] Open
Abstract
Anomalous aggregation of α-synuclein (α-Syn) is a pathological hallmark of many degenerative synucleinopathies including Lewy body dementia (LBD) and Parkinson's disease (PD). Despite its strong link to disease, the precise molecular mechanisms that link α-Syn aggregation to neurodegeneration have yet to be elucidated. Here, we find that elevated α-Syn leads to an increase in the plasma membrane (PM) phosphoinositide PI(4,5)P2, which precipitates α-Syn aggregation and drives toxic increases in mitochondrial Ca2+ and reactive oxygen species leading to neuronal death. Upstream of this toxic signaling pathway is PIP5K1γ, whose abundance and localization is enhanced at the PM by α-Syn-dependent increases in ARF6. Selective inhibition of PIP5K1γ or knockout of ARF6 in neurons rescues α-Syn aggregation and cellular phenotypes of toxicity. Collectively, our data suggest that modulation of phosphoinositide metabolism may be a therapeutic target to slow neurodegeneration for PD and other related neurodegenerative disorders.
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Affiliation(s)
- Jonathan D Horvath
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
| | - Maria Casas
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
| | - Candice Kutchukian
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
| | - Sara Creus Sánchez
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
| | | | | | - Sergi Simó
- Department of Cell Biology and Human Anatomy, University of California, Davis, Davis, CA 95616, USA
| | - Rose E Dixon
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA
| | - Eamonn J Dickson
- Department of Physiology and Membrane Biology, University of California, Davis, Davis, CA 95616, USA.
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13
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Hall TE, Ariotti N, Lo HP, Rae J, Ferguson C, Martel N, Lim YW, Giacomotto J, Parton RG. Cell surface plasticity in response to shape change in the whole organism. Curr Biol 2023; 33:4276-4284.e4. [PMID: 37729911 DOI: 10.1016/j.cub.2023.08.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 07/27/2023] [Accepted: 08/23/2023] [Indexed: 09/22/2023]
Abstract
Plasma membrane rupture can result in catastrophic cell death. The skeletal muscle fiber plasma membrane, the sarcolemma, provides an extreme example of a membrane subject to mechanical stress since these cells specifically evolved to generate contraction and movement. A quantitative model correlating ultrastructural remodeling of surface architecture with tissue changes in vivo is required to understand how membrane domains contribute to the shape changes associated with tissue deformation in whole animals. We and others have shown that loss of caveolae, small invaginations of the plasma membrane particularly prevalent in the muscle sarcolemma, renders the plasma membrane more susceptible to rupture during stretch.1,2,3 While it is thought that caveolae are able to flatten and be absorbed into the bulk membrane to buffer local membrane expansion, a direct demonstration of this model in vivo has been unachievable since it would require measurement of caveolae at the nanoscale combined with detailed whole-animal morphometrics under conditions of perturbation. Here, we describe the development and application of the "active trapping model" where embryonic zebrafish are immobilized in a curved state that mimics natural body axis curvature during an escape response. The model is amenable to multiscale, multimodal imaging including high-resolution whole-animal three-dimensional quantitative electron microscopy. Using the active trapping model, we demonstrate the essential role of caveolae in maintaining sarcolemmal integrity and quantify the specific contribution of caveolar-derived membrane to surface expansion. We show that caveolae directly contribute to an increase in plasma membrane surface area under physiologically relevant membrane deformation conditions.
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Affiliation(s)
- Thomas E Hall
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia.
| | - Nicholas Ariotti
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Harriet P Lo
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - James Rae
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Charles Ferguson
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia; Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Nick Martel
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Ye-Wheen Lim
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Jean Giacomotto
- Griffith Institute for Drug Discovery, Centre for Cellular Phenomics, School of Environment and Science, Griffith University, Brisbane, QLD 4111, Australia; Queensland Brain Institute, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Robert G Parton
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, QLD 4072, Australia; Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, QLD 4072, Australia.
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14
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Dries E, Gilbert G, Roderick HL, Sipido KR. The ryanodine receptor microdomain in cardiomyocytes. Cell Calcium 2023; 114:102769. [PMID: 37390591 DOI: 10.1016/j.ceca.2023.102769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/11/2023] [Accepted: 06/12/2023] [Indexed: 07/02/2023]
Abstract
The ryanodine receptor type 2 (RyR) is a key player in Ca2+ handling during excitation-contraction coupling. During each heartbeat, RyR channels are responsible for linking the action potential with the contractile machinery of the cardiomyocyte by releasing Ca2+ from the sarcoplasmic reticulum. RyR function is fine-tuned by associated signalling molecules, arrangement in clusters and subcellular localization. These parameters together define RyR function within microdomains and are subject to disease remodelling. This review describes the latest findings on RyR microdomain organization, the alterations with disease which result in increased subcellular heterogeneity and emergence of microdomains with enhanced arrhythmogenic potential, and presents novel technologies that guide future research to study and target RyR channels within specific microdomains.
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Affiliation(s)
- Eef Dries
- Lab of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium.
| | - Guillaume Gilbert
- Lab of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium; Laboratoire ORPHY EA 4324, Université de Brest, Brest, France
| | - H Llewelyn Roderick
- Lab of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Karin R Sipido
- Lab of Experimental Cardiology, Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
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15
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Tamkus G, Uchida K, Lopatin AN. T-tubule recovery after detubulation in isolated mouse cardiomyocytes. Physiol Rep 2023; 11:e15779. [PMID: 37537144 PMCID: PMC10400551 DOI: 10.14814/phy2.15779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 07/14/2023] [Accepted: 07/14/2023] [Indexed: 08/05/2023] Open
Abstract
Remodeling of cardiac t-tubules in normal and pathophysiological conditions is an important process contributing to the functional performance of the heart. While it is well documented that deterioration of t-tubule network associated with various pathological conditions can be reversed under certain conditions, the mechanistic understanding of the recovery process is essentially lacking. Accordingly, in this study we investigated some aspects of the recovery of t-tubules after experimentally-induced detubulation. T-tubules of isolated mouse ventricular myocytes were first sealed using osmotic shock approach, and their recovery under various experimental conditions was then characterized using electrophysiologic and imaging techniques. The data show that t-tubule recovery is a strongly temperature-dependent process involving reopening of previously collapsed t-tubular segments. T-tubule recovery is slowed by (1) metabolic inhibition of cells, (2) reducing influx of extracellular Ca2+ as well as by (3) both stabilization and disruption of microtubules. Overall, the data show that t-tubule recovery is a highly dynamic process involving several central intracellular structures and processes and lay the basis for more detailed investigations in this area.
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Affiliation(s)
- Greta Tamkus
- Department of Molecular and Integrative PhysiologyUniversity of MichiganAnn ArborMichiganUSA
- Present address:
John T. Milliken Department of MedicineWashington University School of MedicineSt. LouisMissouriUSA
| | - Keita Uchida
- Department of Molecular and Integrative PhysiologyUniversity of MichiganAnn ArborMichiganUSA
- Present address:
Department of PhysiologyPennsylvania Muscle Institute, University of Pennsylvania, Perelman School of MedicinePhiladelphiaPennsylvaniaUSA
| | - Anatoli N. Lopatin
- Department of Molecular and Integrative PhysiologyUniversity of MichiganAnn ArborMichiganUSA
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16
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Hawdon A, Geoghegan ND, Mohenska M, Elsenhans A, Ferguson C, Polo JM, Parton RG, Zenker J. Apicobasal RNA asymmetries regulate cell fate in the early mouse embryo. Nat Commun 2023; 14:2909. [PMID: 37253716 DOI: 10.1038/s41467-023-38436-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 05/03/2023] [Indexed: 06/01/2023] Open
Abstract
The spatial sorting of RNA transcripts is fundamental for the refinement of gene expression to distinct subcellular regions. Although, in non-mammalian early embryogenesis, differential RNA localisation presages cell fate determination, in mammals it remains unclear. Here, we uncover apical-to-basal RNA asymmetries in outer blastomeres of 16-cell stage mouse preimplantation embryos. Basally directed RNA transport is facilitated in a microtubule- and lysosome-mediated manner. Yet, despite an increased accumulation of RNA transcripts in basal regions, higher translation activity occurs at the more dispersed apical RNA foci, demonstrated by spatial heterogeneities in RNA subtypes, RNA-organelle interactions and translation events. During the transition to the 32-cell stage, the biased inheritance of RNA transcripts, coupled with differential translation capacity, regulates cell fate allocation of trophectoderm and cells destined to form the pluripotent inner cell mass. Our study identifies a paradigm for the spatiotemporal regulation of post-transcriptional gene expression governing mammalian preimplantation embryogenesis and cell fate.
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Affiliation(s)
- Azelle Hawdon
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia
| | - Niall D Geoghegan
- Walter and Eliza Hall Institute of Medical Research, Department of Medical Biology, University of Melbourne, Melbourne, Victoria, Australia
| | - Monika Mohenska
- Department of Anatomy and Developmental Biology, Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, 3800, Australia
- Adelaide Centre for Epigenetics, University of Adelaide, Adelaide, South Australia, Australia
- South Australian immunoGENomics Cancer Institute, University of Adelaide, Adelaide, South Australia, Australia
| | - Anja Elsenhans
- Department of Biology, University of Duisburg-Essen, Essen, Germany
| | - Charles Ferguson
- Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia
| | - Jose M Polo
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia
- Department of Anatomy and Developmental Biology, Development and Stem Cells Program, Monash Biomedicine Discovery Institute, Clayton, VIC, 3800, Australia
- Adelaide Centre for Epigenetics, University of Adelaide, Adelaide, South Australia, Australia
- South Australian immunoGENomics Cancer Institute, University of Adelaide, Adelaide, South Australia, Australia
| | - Robert G Parton
- Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia
- Centre for Microscopy and Microanalysis, University of Queensland, Brisbane, Queensland, Australia
| | - Jennifer Zenker
- Australian Regenerative Medicine Institute, Monash University, Clayton, Victoria, Australia.
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17
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Zong C, Lu Q, Niu J, Meng F, Yu X. A fluorescent probe for detecting mitochondrial viscosity and its application in distinguishing human breast cancer cells from normal ones. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 299:122883. [PMID: 37209476 DOI: 10.1016/j.saa.2023.122883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 04/27/2023] [Accepted: 05/11/2023] [Indexed: 05/22/2023]
Abstract
Mitochondrial viscosity is closely associated with intracellular physiological activities yet their abnormality will result in various diseases. In particular, viscosity in cancer cells is different from that in normal cells, which is thought to be an indicator for cancer diagnosis. However, there were few fluorescent probes able to distinguish homologous cancer and normal cells by detecting mitochondrial viscosity. Herein, we designed a viscosity-sensitive fluorescent probe (named NP) based on the twisting intramolecular charge transfer (TICT) mechanism. NP exhibited exquisite sensitivity to viscosity and selectivity to mitochondria and excellent photophysical properties, such as large Stokes shift and high molar extinction coefficient, which enables wash-free, high-fidelity and fast imaging mitochondria. Moreover, it was capable of detecting mitochondrial viscosity in living cells and tissue, as well as monitoring apoptosis process. Significantly, considering numerous breast cancer cases in every country of the world, NP was successfully applied to distinguish human breast cancer cells (MCF-7) from normal cells (MCF-10A) by difference in fluorescence intensity originated from abnormality in mitochondrial viscosity. All the results indicated that NP could serve as a robust tool for effectively detecting mitochondrial viscosity changes in-situ.
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Affiliation(s)
- Chong Zong
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China
| | - Qing Lu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China; China Fire and Rescue Institute, Changping, Beijing, P. R. China
| | - Jie Niu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China
| | - Fangfang Meng
- Department of Pathology, Qilu Hospital, Cheeloo College of Medicine, Shandong University, Jinan, P. R. China.
| | - Xiaoqiang Yu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan, P. R. China.
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18
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Wu Y, Lim YW, Stroud DA, Martel N, Hall TE, Lo HP, Ferguson C, Ryan MT, McMahon KA, Parton RG. Caveolae sense oxidative stress through membrane lipid peroxidation and cytosolic release of CAVIN1 to regulate NRF2. Dev Cell 2023; 58:376-397.e4. [PMID: 36858041 DOI: 10.1016/j.devcel.2023.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Revised: 11/20/2022] [Accepted: 02/06/2023] [Indexed: 03/03/2023]
Abstract
Caveolae have been linked to many biological functions, but their precise roles are unclear. Using quantitative whole-cell proteomics of genome-edited cells, we show that the oxidative stress response is the major pathway dysregulated in cells lacking the key caveola structural protein, CAVIN1. CAVIN1 deletion compromised sensitivity to oxidative stress in cultured cells and in animals. Wound-induced accumulation of reactive oxygen species and apoptosis were suppressed in Cavin1-null zebrafish, negatively affecting regeneration. Oxidative stress triggered lipid peroxidation and induced caveolar disassembly. The resulting release of CAVIN1 from caveolae allowed direct interaction between CAVIN1 and NRF2, a key regulator of the antioxidant response, facilitating NRF2 degradation. CAVIN1-null cells with impaired negative regulation of NRF2 showed resistance to lipid-peroxidation-induced ferroptosis. Thus, caveolae, via lipid peroxidation and CAVIN1 release, maintain cellular susceptibility to oxidative-stress-induced cell death, demonstrating a crucial role for this organelle in cellular homeostasis and wound response.
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Affiliation(s)
- Yeping Wu
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - Ye-Wheen Lim
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - David A Stroud
- Department of Biochemistry and Pharmacology and The Bio21 Molecular Science and Biotechnology Institute, 3052, University of Melbourne, Parkville, VIC 3052, Australia; Murdoch Children's Research Institute, the Royal Children's Hospital, Parkville, VIC 3052, Australia
| | - Nick Martel
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - Thomas E Hall
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - Harriet P Lo
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - Charles Ferguson
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia
| | - Michael T Ryan
- Monash University, Department of Biochemistry and Molecular Biology, Monash Biomedicine Discovery Institute, Melbourne, VIC 3800, Australia
| | - Kerrie-Ann McMahon
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia.
| | - Robert G Parton
- The University of Queensland, Institute for Molecular Bioscience, Brisbane, QLD 4072, Australia; The University of Queensland, Centre for Microscopy and Microanalysis, Brisbane, QLD 4072, Australia.
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19
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Mackrill JJ. Evolution of the cardiac dyad. Philos Trans R Soc Lond B Biol Sci 2022; 377:20210329. [PMID: 36189805 PMCID: PMC9527923 DOI: 10.1098/rstb.2021.0329] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 12/22/2021] [Indexed: 12/30/2022] Open
Abstract
Cardiac dyads are the site of communication between the sarcoplasmic reticulum (SR) and infoldings of the sarcolemma called transverse-tubules (TT). During heart excitation-contraction coupling, Ca2+-influx through L-type Ca2+ channels in the TT is amplified by release of Ca2+-from the SR via type 2 ryanodine receptors, activating the contractile apparatus. Key proteins involved in cardiac dyad function are bridging integrator 1 (BIN1), junctophilin 2 and caveolin 3. The work presented here aims to reconstruct the evolutionary history of the cardiac dyad, by surveying the scientific literature for ultrastructural evidence of these junctions across all animal taxa; phylogenetically reconstructing the evolutionary history of BIN1; and by comparing peptide motifs involved in TT formation by this protein across metazoans. Key findings are that cardiac dyads have been identified in mammals, arthropods and molluscs, but not in other animals. Vertebrate BIN1 does not group with members of this protein family from other taxa, suggesting that invertebrate BINs are paralogues rather orthologues of this gene. Comparisons of BIN1 peptide sequences of mammals with those of other vertebrates reveals novel features that might contribute to TT and dyad formation. The analyses presented here suggest that the cardiac dyad evolved independently several times during metazoan evolution: an unexpected observation given the diversity of heart structure and function between different animal taxa. This article is part of the theme issue 'The cardiomyocyte: new revelations on the interplay between architecture and function in growth, health, and disease'.
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Affiliation(s)
- John James Mackrill
- Department of Physiology, School of Medicine, University College Cork, Western Gateway Building, Western Road, Cork T12 XF62, Republic of Ireland
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20
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Delay of EGF-Stimulated EGFR Degradation in Myotonic Dystrophy Type 1 (DM1). Cells 2022; 11:cells11193018. [PMID: 36230978 PMCID: PMC9562898 DOI: 10.3390/cells11193018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 09/02/2022] [Accepted: 09/22/2022] [Indexed: 11/18/2022] Open
Abstract
Myotonic dystrophy type 1 (DM1) is an autosomal dominant disease caused by a CTG repeat expansion in the 3′ untranslated region of the dystrophia myotonica protein kinase gene. AKT dephosphorylation and autophagy are associated with DM1. Autophagy has been widely studied in DM1, although the endocytic pathway has not. AKT has a critical role in endocytosis, and its phosphorylation is mediated by the activation of tyrosine kinase receptors, such as epidermal growth factor receptor (EGFR). EGF-activated EGFR triggers the internalization and degradation of ligand–receptor complexes that serve as a PI3K/AKT signaling platform. Here, we used primary fibroblasts from healthy subjects and DM1 patients. DM1-derived fibroblasts showed increased autophagy flux, with enlarged endosomes and lysosomes. Thereafter, cells were stimulated with a high concentration of EGF to promote EGFR internalization and degradation. Interestingly, EGF binding to EGFR was reduced in DM1 cells and EGFR internalization was also slowed during the early steps of endocytosis. However, EGF-activated EGFR enhanced AKT and ERK1/2 phosphorylation levels in the DM1-derived fibroblasts. Therefore, there was a delay in EGF-stimulated EGFR endocytosis in DM1 cells; this alteration might be due to the decrease in the binding of EGF to EGFR, and not to a decrease in AKT phosphorylation.
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21
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Fujise K, Noguchi S, Takeda T. Centronuclear Myopathy Caused by Defective Membrane Remodelling of Dynamin 2 and BIN1 Variants. Int J Mol Sci 2022; 23:ijms23116274. [PMID: 35682949 PMCID: PMC9181712 DOI: 10.3390/ijms23116274] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 02/01/2023] Open
Abstract
Centronuclear myopathy (CNM) is a congenital myopathy characterised by centralised nuclei in skeletal myofibers. T-tubules, sarcolemmal invaginations required for excitation-contraction coupling, are disorganised in the skeletal muscles of CNM patients. Previous studies showed that various endocytic proteins are involved in T-tubule biogenesis and their dysfunction is tightly associated with CNM pathogenesis. DNM2 and BIN1 are two causative genes for CNM that encode essential membrane remodelling proteins in endocytosis, dynamin 2 and BIN1, respectively. In this review, we overview the functions of dynamin 2 and BIN1 in T-tubule biogenesis and discuss how their dysfunction in membrane remodelling leads to CNM pathogenesis.
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Affiliation(s)
- Kenshiro Fujise
- Departments of Neuroscience and Cell Biology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06520-8001, USA;
| | - Satoru Noguchi
- National Institute of Neuroscience, National Center of Neurology and Psychiatry (NCNP), Tokyo 187-8502, Japan;
| | - Tetsuya Takeda
- Department of Biochemistry, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, Shikata-cho 2-5-1, Kita-ku, Okayama 700-8558, Japan
- Correspondence: ; Tel.: +81-86-235-7125; Fax: +81-86-235-7126
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22
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Caporizzo MA, Prosser BL. The microtubule cytoskeleton in cardiac mechanics and heart failure. Nat Rev Cardiol 2022; 19:364-378. [PMID: 35440741 PMCID: PMC9270871 DOI: 10.1038/s41569-022-00692-y] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 03/14/2022] [Indexed: 12/13/2022]
Abstract
The microtubule network of cardiac muscle cells has unique architectural and biophysical features to accommodate the demands of the working heart. Advances in live-cell imaging and in deciphering the 'tubulin code' have shone new light on this cytoskeletal network and its role in heart failure. Microtubule-based transport orchestrates the growth and maintenance of the contractile apparatus through spatiotemporal control of translation, while also organizing the specialized membrane systems required for excitation-contraction coupling. To withstand the high mechanical loads of the working heart, microtubules are post-translationally modified and physically reinforced. In response to stress to the myocardium, the microtubule network remodels, typically through densification, post-translational modification and stabilization. Under these conditions, physically reinforced microtubules resist the motion of the cardiomyocyte and increase myocardial stiffness. Accordingly, modified microtubules have emerged as a therapeutic target for reducing stiffness in heart failure. In this Review, we discuss the latest evidence on the contribution of microtubules to cardiac mechanics, the drivers of microtubule network remodelling in cardiac pathologies and the therapeutic potential of targeting cardiac microtubules in acquired heart diseases.
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Affiliation(s)
- Matthew A Caporizzo
- Department of Molecular Physiology and Biophysics, University of Vermont Larner College of Medicine, Burlington, VT, USA
- Department of Physiology, Pennsylvania Muscle Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Benjamin L Prosser
- Department of Physiology, Pennsylvania Muscle Institute, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA.
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23
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Rossi D, Pierantozzi E, Amadsun DO, Buonocore S, Rubino EM, Sorrentino V. The Sarcoplasmic Reticulum of Skeletal Muscle Cells: A Labyrinth of Membrane Contact Sites. Biomolecules 2022; 12:488. [PMID: 35454077 PMCID: PMC9026860 DOI: 10.3390/biom12040488] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Revised: 03/14/2022] [Accepted: 03/18/2022] [Indexed: 12/17/2022] Open
Abstract
The sarcoplasmic reticulum of skeletal muscle cells is a highly ordered structure consisting of an intricate network of tubules and cisternae specialized for regulating Ca2+ homeostasis in the context of muscle contraction. The sarcoplasmic reticulum contains several proteins, some of which support Ca2+ storage and release, while others regulate the formation and maintenance of this highly convoluted organelle and mediate the interaction with other components of the muscle fiber. In this review, some of the main issues concerning the biology of the sarcoplasmic reticulum will be described and discussed; particular attention will be addressed to the structure and function of the two domains of the sarcoplasmic reticulum supporting the excitation-contraction coupling and Ca2+-uptake mechanisms.
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Affiliation(s)
- Daniela Rossi
- Department of Molecular and Developmental Medicine, University of Siena, Via Aldo Moro 2, 53100 Siena, Italy; (E.P.); (D.O.A.); (S.B.); (E.M.R.); (V.S.)
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24
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Abstract
Microtubules are essential cytoskeletal elements found in all eukaryotic cells. The structure and composition of microtubules regulate their function, and the dynamic remodeling of the network by posttranslational modifications and microtubule-associated proteins generates diverse populations of microtubules adapted for various contexts. In the cardiomyocyte, the microtubules must accommodate the unique challenges faced by a highly contractile, rigidly structured, and long-lasting cell. Through their canonical trafficking role and positioning of mRNA, proteins, and organelles, microtubules regulate essential cardiomyocyte functions such as electrical activity, calcium handling, protein translation, and growth. In a more specialized role, posttranslationally modified microtubules form load-bearing structures that regulate myocyte mechanics and mechanotransduction. Modified microtubules proliferate in cardiovascular diseases, creating stabilized resistive elements that impede cardiomyocyte contractility and contribute to contractile dysfunction. In this review, we highlight the most exciting new concepts emerging from recent studies into canonical and noncanonical roles of cardiomyocyte microtubules.
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Affiliation(s)
- Keita Uchida
- Department of Physiology, Pennsylvania Muscle Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
| | - Emily A Scarborough
- Department of Physiology, Pennsylvania Muscle Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
| | - Benjamin L Prosser
- Department of Physiology, Pennsylvania Muscle Institute, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA;
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25
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Abstract
In mammalian cardiac myocytes, the plasma membrane includes the surface sarcolemma but also a network of membrane invaginations called transverse (t-) tubules. These structures carry the action potential deep into the cell interior, allowing efficient triggering of Ca2+ release and initiation of contraction. Once thought to serve as rather static enablers of excitation-contraction coupling, recent work has provided a newfound appreciation of the plasticity of the t-tubule network's structure and function. Indeed, t-tubules are now understood to support dynamic regulation of the heartbeat across a range of timescales, during all stages of life, in both health and disease. This review article aims to summarize these concepts, with consideration given to emerging t-tubule regulators and their targeting in future therapies.
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Affiliation(s)
- Katharine M Dibb
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom;
| | - William E Louch
- Institute for Experimental Medical Research, Oslo University Hospital and University of Oslo, Oslo, Norway
- K.G. Jebsen Centre for Cardiac Research, University of Oslo, Oslo Norway
| | - Andrew W Trafford
- Unit of Cardiac Physiology, Division of Cardiovascular Sciences, School of Medical Sciences, Faculty of Biology, Medicine and Health, Manchester Academic Health Science Centre, University of Manchester, Manchester, United Kingdom;
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26
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Lo HP, Lim YW, Xiong Z, Martel N, Ferguson C, Ariotti N, Giacomotto J, Rae J, Floetenmeyer M, Moradi SV, Gao Y, Tillu VA, Xia D, Wang H, Rahnama S, Nixon SJ, Bastiani M, Day RD, Smith KA, Palpant NJ, Johnston WA, Alexandrov K, Collins BM, Hall TE, Parton RG. Cavin4 interacts with Bin1 to promote T-tubule formation and stability in developing skeletal muscle. J Cell Biol 2021; 220:e201905065. [PMID: 34633413 PMCID: PMC8513623 DOI: 10.1083/jcb.201905065] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 06/02/2021] [Accepted: 09/20/2021] [Indexed: 11/22/2022] Open
Abstract
The cavin proteins are essential for caveola biogenesis and function. Here, we identify a role for the muscle-specific component, Cavin4, in skeletal muscle T-tubule development by analyzing two vertebrate systems, mouse and zebrafish. In both models, Cavin4 localized to T-tubules, and loss of Cavin4 resulted in aberrant T-tubule maturation. In zebrafish, which possess duplicated cavin4 paralogs, Cavin4b was shown to directly interact with the T-tubule-associated BAR domain protein Bin1. Loss of both Cavin4a and Cavin4b caused aberrant accumulation of interconnected caveolae within the T-tubules, a fragmented T-tubule network enriched in Caveolin-3, and an impaired Ca2+ response upon mechanical stimulation. We propose a role for Cavin4 in remodeling the T-tubule membrane early in development by recycling caveolar components from the T-tubule to the sarcolemma. This generates a stable T-tubule domain lacking caveolae that is essential for T-tubule function.
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Affiliation(s)
- Harriet P. Lo
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Ye-Wheen Lim
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Zherui Xiong
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Nick Martel
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Charles Ferguson
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Nicholas Ariotti
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Jean Giacomotto
- Queensland Brain Institute, The University of Queensland, Brisbane, Queensland, Australia
- Queensland Centre for Mental Health Research, West Moreton Hospital and Health Service and University of Queensland, Brisbane, Queensland, Australia
| | - James Rae
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Matthias Floetenmeyer
- Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland, Australia
| | - Shayli Varasteh Moradi
- CSIRO–Queensland University of Technology Synthetic Biology Alliance, ARC Centre of Excellence in Synthetic Biology, Centre for Agriculture and the Bioeconomy, School of Biology and Environmental Science, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Ya Gao
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Vikas A. Tillu
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Di Xia
- Genome Innovation Hub, The University of Queensland, Brisbane, Queensland, Australia
| | - Huang Wang
- Translational Research Institute, Mater Research Institute, The University of Queensland, Brisbane, Queensland, Australia
| | - Samira Rahnama
- CSIRO–Queensland University of Technology Synthetic Biology Alliance, ARC Centre of Excellence in Synthetic Biology, Centre for Agriculture and the Bioeconomy, School of Biology and Environmental Science, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Susan J. Nixon
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Michele Bastiani
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Ryan D. Day
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Kelly A. Smith
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Nathan J. Palpant
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Wayne A. Johnston
- CSIRO–Queensland University of Technology Synthetic Biology Alliance, ARC Centre of Excellence in Synthetic Biology, Centre for Agriculture and the Bioeconomy, School of Biology and Environmental Science, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Kirill Alexandrov
- CSIRO–Queensland University of Technology Synthetic Biology Alliance, ARC Centre of Excellence in Synthetic Biology, Centre for Agriculture and the Bioeconomy, School of Biology and Environmental Science, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Brett M. Collins
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Thomas E. Hall
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
| | - Robert G. Parton
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Queensland, Australia
- Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Queensland, Australia
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27
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Yang R, Hao Q, Lu Q, Meng F, Niu J, Liu Z, Niu G, Yu X. Fabrication of small-structure red-emissive fluorescent probes for plasma membrane enables quantification of nuclear to cytoplasmic ratio in live cells and tissues. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 249:119338. [PMID: 33360060 DOI: 10.1016/j.saa.2020.119338] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 12/06/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
Nuclear to cytoplasmic ratio is one of the vital parameters in diagnosis of cancer by means of hematoxylin-eosin (HE) stained histopathology. However, HE histopathology dependent on mechanical tissue slice damages biosamples and exhibits insufficient accuracy. Herein, we rationally prepared two small-molecule plasma membrane fluorescent probes with red-emitting fluorescence for visualizing plasma membrane in living cells and tissues. Their fluorescence intensities are strongly affected by environmental viscosity, which enables the exclusive imaging of plasma membrane in high fidelity. The probes can visualize plasma membrane in SiHa and rat blood red cells. Particularly, the probes are able to visualize T-tubule (transverse tubule) in skeletal muscle tissues successfully, suggesting their ability to image plasma membrane in tissues. In cooperation with Hoechst 33342, the nuclear to cytoplasmic ratio was successfully qualified in live cells and tissues. We believe these probes may have potential applications in facilitating the study on histopathology and the related areas.
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Affiliation(s)
- Rui Yang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
| | - Qiuhua Hao
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
| | - Qing Lu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
| | - Fangfang Meng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
| | - Jie Niu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China
| | - Zhiqiang Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China.
| | - Guangle Niu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China.
| | - Xiaoqiang Yu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, PR China; Advanced Medical Research Institute, Shandong University, Jinan 250012, PR China.
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28
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Hao Q, Li C, Niu J, Yang R, Yu X. Construction of fluorescent rotors with multiple intramolecular rotation sites for visualization of cellular viscous compartments with elevated fidelity. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1132-1137. [PMID: 33595554 DOI: 10.1039/d0ay02247k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Viscosity-sensitive fluorescent dyes are widely utilized to image viscous intracellular compartments with high fidelity. However, the sensitivity of many fluorescent rotors needs improvement for bioimaging applications. Herein, we proposed to construct a fluorescent rotor with multiple intramolecular rotation sites to elevate its sensitivity to environmental viscosity. The fabricated fluorescent rotor showed evidently increased sensitivity to viscosity and had the potential to image intracellular viscous compartments with improved fidelity. By decorating the rotor with sidechains of different lengths, we successfully fabricated two fluorescent probes, TAPI-6 and TAPI-16, to visualize the mitochondria and plasma membrane, respectively, with high fidelity. The two probes were also successfully utilized to clearly visualize the mitochondria and plasma membranes in skeletal muscle tissue, cardiac muscle tissue, and liver tissue, demonstrating the potential of the fluorescent rotor for bioimaging applications. We believe that the strategy of increasing the sensitivity to viscosity using multiple rotation sites is valuable for the construction of fluorescent rotors, and the presented fluorescent probes in this work can serve as powerful tools for biological research.
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Affiliation(s)
- Qiuhua Hao
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, P. R. China.
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29
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Xiong Z, Lo HP, McMahon KA, Martel N, Jones A, Hill MM, Parton RG, Hall TE. In vivo proteomic mapping through GFP-directed proximity-dependent biotin labelling in zebrafish. eLife 2021; 10:64631. [PMID: 33591275 PMCID: PMC7906605 DOI: 10.7554/elife.64631] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 02/15/2021] [Indexed: 12/21/2022] Open
Abstract
Protein interaction networks are crucial for complex cellular processes. However, the elucidation of protein interactions occurring within highly specialised cells and tissues is challenging. Here, we describe the development, and application, of a new method for proximity-dependent biotin labelling in whole zebrafish. Using a conditionally stabilised GFP-binding nanobody to target a biotin ligase to GFP-labelled proteins of interest, we show tissue-specific proteomic profiling using existing GFP-tagged transgenic zebrafish lines. We demonstrate the applicability of this approach, termed BLITZ (Biotin Labelling In Tagged Zebrafish), in diverse cell types such as neurons and vascular endothelial cells. We applied this methodology to identify interactors of caveolar coat protein, cavins, in skeletal muscle. Using this system, we defined specific interaction networks within in vivo muscle cells for the closely related but functionally distinct Cavin4 and Cavin1 proteins.
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Affiliation(s)
- Zherui Xiong
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Harriet P Lo
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Kerrie-Ann McMahon
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Nick Martel
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Alun Jones
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
| | - Michelle M Hill
- QIMR Berghofer Medical Research Institute, Herston, Australia
| | - Robert G Parton
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia.,Centre for Microscopy and Microanalysis, The University of Queensland, Brisbane, Australia
| | - Thomas E Hall
- Institute for Molecular Bioscience, The University of Queensland, Brisbane, Australia
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30
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York HM, Coyle J, Arumugam S. To be more precise: the role of intracellular trafficking in development and pattern formation. Biochem Soc Trans 2020; 48:2051-2066. [PMID: 32915197 PMCID: PMC7609031 DOI: 10.1042/bst20200223] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/24/2020] [Accepted: 08/26/2020] [Indexed: 02/07/2023]
Abstract
Living cells interpret a variety of signals in different contexts to elucidate functional responses. While the understanding of signalling molecules, their respective receptors and response at the gene transcription level have been relatively well-explored, how exactly does a single cell interpret a plethora of time-varying signals? Furthermore, how their subsequent responses at the single cell level manifest in the larger context of a developing tissue is unknown. At the same time, the biophysics and chemistry of how receptors are trafficked through the complex dynamic transport network between the plasma membrane-endosome-lysosome-Golgi-endoplasmic reticulum are much more well-studied. How the intracellular organisation of the cell and inter-organellar contacts aid in orchestrating trafficking, as well as signal interpretation and modulation by the cells are beginning to be uncovered. In this review, we highlight the significant developments that have strived to integrate endosomal trafficking, signal interpretation in the context of developmental biology and relevant open questions with a few chosen examples. Furthermore, we will discuss the imaging technologies that have been developed in the recent past that have the potential to tremendously accelerate knowledge gain in this direction while shedding light on some of the many challenges.
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Affiliation(s)
- Harrison M. York
- Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC 3800, Australia
| | - Joanne Coyle
- Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC 3800, Australia
| | - Senthil Arumugam
- Monash Biomedicine Discovery Institute, Faculty of Medicine, Nursing and Health Sciences, Monash University, Melbourne, VIC 3800, Australia
- European Molecular Biological Laboratory Australia (EMBL Australia), Monash University, Melbourne, VIC 3800, Australia
- ARC Centre of Excellence in Advanced Molecular Imaging, Monash University, Melbourne, VIC 3800, Australia
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