Cell injury triggers actin polymerization to initiate epithelial restitution
The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the role of actin in gastric repair and gastric organoids (gastroids). In response to two-photon-induced cellular damage of either an gastric or g...
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Published in | Journal of cell science Vol. 131; no. 16 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
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15.08.2018
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Abstract | The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the role of actin in gastric repair
and
gastric organoids (gastroids). In response to two-photon-induced cellular damage of either an
gastric or
gastroid epithelium, actin redistribution specifically occurred in the lateral membranes of cells neighboring the damaged cell. This was followed by their migration inward to close the gap at the basal pole of the dead cell, in parallel with exfoliation of the dead cell into the lumen. The repair and focal increase of actin was significantly blocked by treatment with EDTA or the inhibition of actin polymerization. Treatment with inhibitors of myosin light chain kinase, myosin II, trefoil factor 2 signaling or phospholipase C slowed both the initial actin redistribution and the repair. While Rac1 inhibition facilitated repair, inhibition of RhoA/Rho-associated protein kinase inhibited it. Inhibitors of focal adhesion kinase and Cdc42 had negligible effects. Hence, initial actin polymerization occurs in the lateral membrane, and is primarily important to initiate dead cell exfoliation and cell migration to close the gap. |
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AbstractList | The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the role of actin in gastric repair
and
gastric organoids (gastroids). In response to two-photon-induced cellular damage of either an
gastric or
gastroid epithelium, actin redistribution specifically occurred in the lateral membranes of cells neighboring the damaged cell. This was followed by their migration inward to close the gap at the basal pole of the dead cell, in parallel with exfoliation of the dead cell into the lumen. The repair and focal increase of actin was significantly blocked by treatment with EDTA or the inhibition of actin polymerization. Treatment with inhibitors of myosin light chain kinase, myosin II, trefoil factor 2 signaling or phospholipase C slowed both the initial actin redistribution and the repair. While Rac1 inhibition facilitated repair, inhibition of RhoA/Rho-associated protein kinase inhibited it. Inhibitors of focal adhesion kinase and Cdc42 had negligible effects. Hence, initial actin polymerization occurs in the lateral membrane, and is primarily important to initiate dead cell exfoliation and cell migration to close the gap. The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the role of actin in gastric repair in vivo and in vitro gastric organoids (gastroids). In response to two-photon-induced cellular damage of either an in vivo gastric or in vitro gastroid epithelium, actin redistribution specifically occurred in the lateral membranes of cells neighboring the damaged cell. This was followed by their migration inward to close the gap at the basal pole of the dead cell, in parallel with exfoliation of the dead cell into the lumen. The repair and focal increase of actin was significantly blocked by treatment with EDTA or the inhibition of actin polymerization. Treatment with inhibitors of myosin light chain kinase, myosin II, trefoil factor 2 signaling or phospholipase C slowed both the initial actin redistribution and the repair. While Rac1 inhibition facilitated repair, inhibition of RhoA/Rho-associated protein kinase inhibited it. Inhibitors of focal adhesion kinase and Cdc42 had negligible effects. Hence, initial actin polymerization occurs in the lateral membrane, and is primarily important to initiate dead cell exfoliation and cell migration to close the gap. The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the role of actin in gastric repair in vivo and in vitro gastric organoids (gastroids). In response to two-photon-induced cellular damage of either an in vivo gastric or in vitro gastroid epithelium, actin redistribution specifically occurred in the lateral membranes of cells neighboring the damaged cell. This was followed by their migration inward to close the gap at the basal pole of the dead cell, in parallel with exfoliation of the dead cell into the lumen. The repair and focal increase of actin was significantly blocked by treatment with EDTA or the inhibition of actin polymerization. Treatment with inhibitors of myosin light chain kinase, myosin II, trefoil factor 2 signaling or phospholipase C slowed both the initial actin redistribution and the repair. While Rac1 inhibition facilitated repair, inhibition of RhoA/Rho-associated protein kinase inhibited it. Inhibitors of focal adhesion kinase and Cdc42 had negligible effects. Hence, initial actin polymerization occurs in the lateral membrane, and is primarily important to initiate dead cell exfoliation and cell migration to close the gap. Summary: The role of actin in epithelial repair is explored in experiments using gastric organoids, demonstrating that initial actin polymerization in the lateral membrane is of primary importance for initiation of repair. |
Author | Gurniak, Christine B Hanyu, Hikaru Medina-Candelaria, Neisha M Aihara, Eitaro Matthis, Andrea L Montrose, Marshall H Zhang, Tongli Engevik, Kristen A Witke, Walter Turner, Jerrold R |
AuthorAffiliation | 1 Department of Pharmacology and Systems Physiology , University of Cincinnati , Cincinnati, OH 45267, USA 2 Institute of Genetics, University of Bonn , Bonn , Germany 3 Departments of Pathology and Medicine , Brigham and Women's Hospital and Harvard Medical School , Boston, MA 02115, USA |
AuthorAffiliation_xml | – name: 3 Departments of Pathology and Medicine , Brigham and Women's Hospital and Harvard Medical School , Boston, MA 02115, USA – name: 2 Institute of Genetics, University of Bonn , Bonn , Germany – name: 1 Department of Pharmacology and Systems Physiology , University of Cincinnati , Cincinnati, OH 45267, USA |
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Keywords | Epithelial cell Gastric organoid Repair Actin Cell migration |
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Snippet | The role of the actin cytoskeleton in the sequence of physiological epithelial repair in the intact epithelium has yet to be elucidated. Here, we explore the... |
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SubjectTerms | Actins - metabolism Animals Cell Movement Cells, Cultured Epithelial Cells - physiology Female Gastric Mucosa - injuries Gastric Mucosa - metabolism Gastric Mucosa - physiology Male Mice Mice, Transgenic Organoids - cytology Organoids - injuries Organoids - physiology Polymerization Protein Multimerization - physiology Re-Epithelialization - physiology Regeneration - physiology Stomach - cytology Stomach - injuries |
Title | Cell injury triggers actin polymerization to initiate epithelial restitution |
URI | https://www.ncbi.nlm.nih.gov/pubmed/30072444 https://search.proquest.com/docview/2083718126 https://pubmed.ncbi.nlm.nih.gov/PMC6127731 |
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