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McGowan SE, Gilfanov N, Chandurkar MK, Stiber JA, Han SJ. Drebrin is Required for Myosin-facilitated Actin Cytoskeletal Remodeling during Pulmonary Alveolar Development. Am J Respir Cell Mol Biol 2024; 70:308-321. [PMID: 38271699 DOI: 10.1165/rcmb.2023-0229oc] [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: 06/22/2023] [Accepted: 01/25/2024] [Indexed: 01/27/2024] Open
Abstract
Alveolar septation increases gas-exchange surface area and requires coordinated cytoskeletal rearrangement in lung fibroblasts (LFs) to balance the demands of contraction and cell migration. We hypothesized that DBN (drebrin), a modulator of the actin cytoskeleton in neuronal dendrites, regulates the remodeling of the LF cytoskeleton. Using mice bearing a transgelin-Cre-targeted deletion of Dbn in pulmonary fibroblasts and pericytes, we examined alterations in alveolar septal outgrowth, LF spreading and migration, and actomyosin function. The alveolar surface area and number of alveoli were reduced, whereas alveolar ducts were enlarged, in mice bearing the dbn deletion (DBNΔ) compared with their littermates bearing only one dbn-Flox allele (control). Cultured DBNΔ LFs were deficient in their responses to substrate rigidity and migrated more slowly. Drebrin was abundant in the actin cortex and lamella, and the actin fiber orientation was less uniform in lamella of DBNΔ LFs, which limited the development of traction forces and altered focal adhesion dynamics. Actin fiber orientation is regulated by contractile NM2 (nonmuscle myosin-2) motors, which help arrange actin stress fibers into thick ventral actin stress fibers. Using fluorescence anisotropy, we observed regional intracellular differences in myosin regulatory light chain phosphorylation in control LFs that were altered by dbn deletion. Using perturbations to induce and then release stalling of NM2 on actin in LFs from both genotypes, we made predictions explaining how DBN interacts with actin and NM2. These studies provide new insight for diseases such as emphysema and pulmonary fibrosis, in which fibroblasts inappropriately respond to mechanical cues in their environment.
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Affiliation(s)
- Stephen E McGowan
- Department of Veterans Affairs Medical Center, Iowa City, Iowa
- Department of Medicine, Carver College of Medicine, University of Iowa, Iowa City, Iowa
| | | | - Mohanish K Chandurkar
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan
| | - Jonathan A Stiber
- Department of Medicine, Duke University, Durham, North Carolina; and
| | - Sangyoon J Han
- Department of Biomedical Engineering, Michigan Technological University, Houghton, Michigan
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Karnam S, Maddala R, Stiber JA, Rao PV. Drebrin, an actin-binding protein, is required for lens morphogenesis and growth. Dev Dyn 2021; 250:1600-1617. [PMID: 33896079 PMCID: PMC8542647 DOI: 10.1002/dvdy.353] [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: 01/06/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Lens morphogenesis, architecture, and clarity are known to be critically dependent on actin cytoskeleton organization and cell adhesive interactions. There is limited knowledge, however regarding the identity and role of key proteins regulating actin cytoskeletal organization in the lens. This study investigated the role of drebrin, a developmentally regulated actin-binding protein, in mouse lens development by generating and characterizing a conditional knockout (cKO) mouse model using the Cre-LoxP recombination approach. RESULTS Drebrin E, a splice variant of DBN1 is a predominant isoform expressed in the mouse lens and exhibits a maturation-dependent downregulation. Drebrin co-distributes with actin in both epithelium and fibers. Conditional deficiency (both haploinsufficiency and complete absence) of drebrin results in disrupted lens morphogenesis leading to cataract and microphthalmia. The drebrin cKO lens reveals a dramatic decrease in epithelial height and width, E-cadherin, and proliferation, and increased apoptotic cell death and expression of α-smooth muscle actin, together with severely impaired fiber cell organization, polarity, and cell-cell adhesion. CONCLUSIONS This study demonstrates the requirement of drebrin in lens development and growth, with drebrin deficiency leading to impaired lens morphogenesis and microphthalmia.
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Affiliation(s)
- Shruthi Karnam
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC. USA
| | - Rupalatha Maddala
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC. USA
| | - Jonathan A Stiber
- Department of Medicine, Duke University School of Medicine, Durham, NC. USA
| | - Ponugoti V Rao
- Department of Ophthalmology, Duke University School of Medicine, Durham, NC. USA
- Department of Pharmacology and Cancer Biology, Duke University School of Medicine, Durham, NC. USA
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Delgado M, Washam CL, Urbaniak A, Heflin B, Storey AJ, Lan RS, Mackintosh SG, Tackett AJ, Byrum SD, Chambers TC. Phosphoproteomics Provides Novel Insights into the Response of Primary Acute Lymphoblastic Leukemia Cells to Microtubule Depolymerization in G1 Phase of the Cell Cycle. ACS OMEGA 2021; 6:24949-24959. [PMID: 34604676 PMCID: PMC8482483 DOI: 10.1021/acsomega.1c03936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Indexed: 06/13/2023]
Abstract
Microtubule targeting agents (MTAs) have been used for the treatment of cancer for many decades and are among the most successful chemotherapeutic agents. However, their application and effectiveness are limited because of toxicity and resistance as well as a lack of knowledge of molecular mechanisms downstream of microtubule inhibition. Insights into key pathways that link microtubule disruption to cell death is critical for optimal use of these drugs, for defining biomarkers useful in patient stratification, and for informed design of drug combinations. Although MTAs characteristically induce death in mitosis, microtubule destabilizing agents such as vincristine also induce death directly in G1 phase in primary acute lymphoblastic leukemia (ALL) cells. Because many signaling pathways regulating cell survival and death involve changes in protein expression and phosphorylation, we undertook a comprehensive quantitative proteomic study of G1 phase ALL cells treated with vincristine. The results revealed distinct alterations associated with c-Jun N-terminal kinase signaling, anti-proliferative signaling, the DNA damage response, and cytoskeletal remodeling. Signals specifically associated with cell death were identified by pre-treatment with the CDK4/6 inhibitor palbociclib, which caused G1 arrest and precluded death induction. These results provide insights into signaling mechanisms regulating cellular responses to microtubule inhibition and provide a foundation for a better understanding of the clinical mechanisms of MTAs and for the design of novel drug combinations. The mass spectrometry proteomics data have been deposited to the PRIDE Archive (http://www.ebi.ac.uk/pride/archive/) via the PRIDE partner repository with the data set identifier PXD027190 and 10.6019/PXD027190.
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Affiliation(s)
- Magdalena Delgado
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Charity L. Washam
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
- Arkansas
Children’s Research Institute, 13 Children’s Way, Little Rock, Arkansas 72202, United States
| | - Alicja Urbaniak
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Billie Heflin
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Aaron J. Storey
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Renny S. Lan
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Samuel G. Mackintosh
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Alan J. Tackett
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
- Arkansas
Children’s Research Institute, 13 Children’s Way, Little Rock, Arkansas 72202, United States
- Winthrop
P. Rockefeller Cancer Institute, 449 Jack Stephens Dr, Little Rock, Arkansas 72205, United
States
| | - Stephanie D. Byrum
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
- Arkansas
Children’s Research Institute, 13 Children’s Way, Little Rock, Arkansas 72202, United States
- Winthrop
P. Rockefeller Cancer Institute, 449 Jack Stephens Dr, Little Rock, Arkansas 72205, United
States
| | - Timothy C. Chambers
- Department
of Biochemistry and Molecular Biology, University
of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
- Winthrop
P. Rockefeller Cancer Institute, 449 Jack Stephens Dr, Little Rock, Arkansas 72205, United
States
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4
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Effects of neuronal drebrin on actin dynamics. Biochem Soc Trans 2021; 49:685-692. [PMID: 33739391 DOI: 10.1042/bst20200577] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 02/14/2021] [Accepted: 02/23/2021] [Indexed: 11/17/2022]
Abstract
Drebrin is a key regulator of actin cytoskeleton in neuronal cells which is critical for synaptic plasticity, neuritogenesis, and neuronal migration. It is also known to orchestrate a cross-talk between actin and microtubules. Decreased level of drebrin is a hallmark of multiple neurodegenerative disorders such as Alzheimer's disease. Despite its established importance in health and disease, we still have a lot to learn about drebrin's interactome and its effects on cytoskeletal dynamics. This review aims to summarize the recently reported novel effects of drebrin on actin and its regulators. Here I will also reflect on the most recent progress made in understanding of the role of drebrin isoforms and posttranslational modifications on its functionality.
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Yasuda H, Kojima N, Hanamura K, Yamazaki H, Sakimura K, Shirao T. Drebrin Isoforms Critically Regulate NMDAR- and mGluR-Dependent LTD Induction. Front Cell Neurosci 2018; 12:330. [PMID: 30349460 PMCID: PMC6186840 DOI: 10.3389/fncel.2018.00330] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 09/10/2018] [Indexed: 02/01/2023] Open
Abstract
Drebrin is an actin-binding protein that is preferentially expressed in the brain. It is highly localized in dendritic spines and regulates spine shapes. The embryonic-type (drebrin E) is expressed in the embryonic and early postnatal brain and is replaced by the adult-type (drebrin A) during development. In parallel, NMDA receptor (NMDAR)-dependent long-term depression (LTD) of synaptic transmission, induced by low-frequency stimulation (LFS), is dominant in the immature brain and decreases during development. Here, we report that drebrin regulates NMDAR-dependent and group 1 metabotropic glutamate receptor (mGluR)-dependent LTD induction in the hippocampus. While LFS induced NMDAR-dependent LTD in the developing hippocampus in wild-type (WT) mice, it did not induce LTD in developing drebrin E and A double knockout (DXKO) mice, indicating that drebrin is required for NMDAR-dependent LTD. On the other hand, LFS induced robust LTD dependent on mGluR5, one of group 1 mGluRs, in both developing and adult brains of drebrin A knockout (DAKO) mice, in which drebrin E is expressed throughout development and adulthood. Agonist-induced mGluR-dependent LTD was normal in WT and DXKO mice; however, it was enhanced in DAKO mice. Also, mGluR1, another group 1 mGluR, was involved in agonist-induced mGluR-dependent LTD in DAKO mice. These data suggest that abnormal drebrin E expression in adults promotes group 1 mGluR-dependent LTD induction. Therefore, while drebrin expression is critical for NMDAR-dependent LTD induction, developmental conversion from drebrin E to drebrin A prevents robust group 1 mGluR-dependent LTD.
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Affiliation(s)
- Hiroki Yasuda
- Department of Neurobiology and Behavior, Graduate School of Medicine, Gunma University, Maebashi, Japan.,Education and Research Support Center, Graduate School of Medicine, Gunma University, Maebashi, Japan.,Division of Physiology, Faculty of Medicine, Saga University, Saga, Japan
| | - Nobuhiko Kojima
- Department of Neurobiology and Behavior, Graduate School of Medicine, Gunma University, Maebashi, Japan.,Faculty of Life Sciences, Toyo University, Itakura, Japan
| | - Kenji Hanamura
- Department of Neurobiology and Behavior, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Hiroyuki Yamazaki
- Department of Neurobiology and Behavior, Graduate School of Medicine, Gunma University, Maebashi, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Tomoaki Shirao
- Department of Neurobiology and Behavior, Graduate School of Medicine, Gunma University, Maebashi, Japan.,Education and Research Support Center, Graduate School of Medicine, Gunma University, Maebashi, Japan
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Fabbri C, Corponi F, Souery D, Kasper S, Montgomery S, Zohar J, Rujescu D, Mendlewicz J, Serretti A. The Genetics of Treatment-Resistant Depression: A Critical Review and Future Perspectives. Int J Neuropsychopharmacol 2018; 22:93-104. [PMID: 29688548 PMCID: PMC6368368 DOI: 10.1093/ijnp/pyy024] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Accepted: 04/05/2018] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND One-third of depressed patients develop treatment-resistant depression with the related sequelae in terms of poor functionality and worse prognosis. Solid evidence suggests that genetic variants are potentially valid predictors of antidepressant efficacy and could be used to provide personalized treatments. METHODS The present review summarizes genetic findings of treatment-resistant depression including results from candidate gene studies and genome-wide association studies. The limitations of these approaches are discussed, and suggestions to improve the design of future studies are provided. RESULTS Most studies used the candidate gene approach, and few genes showed replicated associations with treatment-resistant depression and/or evidence obtained through complementary approaches (e.g., gene expression studies). These genes included GRIK4, BDNF, SLC6A4, and KCNK2, but confirmatory evidence in large cohorts was often lacking. Genome-wide association studies did not identify any genome-wide significant association at variant level, but pathways including genes modulating actin cytoskeleton, neural plasticity, and neurogenesis may be associated with treatment-resistant depression, in line with results obtained by genome-wide association studies of antidepressant response. The improvement of aggregated tests (e.g., polygenic risk scores), possibly using variant/gene prioritization criteria, the increase in the covering of genetic variants, and the incorporation of clinical-demographic predictors of treatment-resistant depression are proposed as possible strategies to improve future pharmacogenomic studies. CONCLUSIONS Genetic biomarkers to identify patients with higher risk of treatment-resistant depression or to guide treatment in these patients are not available yet. Methodological improvements of future studies could lead to the identification of genetic biomarkers with clinical validity.
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Affiliation(s)
- Chiara Fabbri
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Bologna, Italy
| | - Filippo Corponi
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Bologna, Italy
| | - Daniel Souery
- Université Libre de Bruxelles and Psy Pluriel Centre Europèen de Psychologie Medicale, Brussels, Belgium
| | - Siegfried Kasper
- Department of Psychiatry and Psychotherapy, Medical University of Vienna, Vienna, Austria
| | | | - Joseph Zohar
- Psychiatric Division, Chaim Sheba Medical Center, Ramat Gan, Israel
| | - Dan Rujescu
- Psychiatric Division, Chaim Sheba Medical Center, Ramat Gan, Israel,University Clinic for Psychiatry, Psychotherapy and Psychosomatic, Martin-Luther-University Halle-Wittenberg, Germany
| | - Julien Mendlewicz
- Psychiatric Division, Chaim Sheba Medical Center, Ramat Gan, Israel,Université Libre de Bruxelles, Brussels, Belgium
| | - Alessandro Serretti
- Department of Biomedical and NeuroMotor Sciences, University of Bologna, Bologna, Italy,Psychiatric Division, Chaim Sheba Medical Center, Ramat Gan, Israel,Correspondence: Alessandro Serretti, MD, PhD, Department of Biomedical and NeuroMotor Sciences, University of Bologna, Viale Carlo Pepoli 5, 40123 Bologna, Italy ()
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