Mechanical mutability in connective tissue of starfish body wall.

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  • Author(s): Motokawa T;Motokawa T
  • Source:
    The Biological bulletin [Biol Bull] 2011 Dec; Vol. 221 (3), pp. 280-9.
  • Publication Type:
    Journal Article; Research Support, Non-U.S. Gov't
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: University of Chicago Press Country of Publication: United States NLM ID: 2984727R Publication Model: Print Cited Medium: Internet ISSN: 1939-8697 (Electronic) Linking ISSN: 00063185 NLM ISO Abbreviation: Biol Bull Subsets: MEDLINE
    • Publication Information:
      Publication: Oct. 2016- : Chicago : University of Chicago Press
      Original Publication: Lancaster, Pa. [etc.]
    • Subject Terms:
      Tensile Strength*; Starfish/*physiology; Acetylcholine/metabolism ; Animals ; Biomechanical Phenomena ; Connective Tissue/physiology ; Connective Tissue/ultrastructure ; Dermis/physiology ; Dermis/ultrastructure ; Japan ; Microscopy, Electron ; Potassium/metabolism ; Starfish/ultrastructure
    • Abstract:
      Stiffness changes in response to mechanical and chemical stimulation were studied in muscle-free dermal samples from the body wall of the starfish Linckia laevigata. The ultrastructural study showed that the dermis was packed with collagen fibrils between which only a small number of cells were observed. Muscles were found only in the walls of coelomic extensions leading to papulae. Stress-strain tests were performed on isolated dermis containing no muscles. The tangent modulus was 27.5 MPa at 0.04% strain rate in the stress-strain tests. It was increased to 40.7 MPa by mechanical stimulation, which also increased the tensile strength and breaking-strain energy density. Dynamic mechanical tests showed that the increase in stiffness in response to mechanical stimulation was transient. Acetylcholine (10(-6)-10(-3) mol l(-1)) and artificial seawater with an elevated potassium concentration (KASW) stiffened the dermis. Mechanical stimulation caused a 12% mass loss. KASW also caused mass loss, which was inhibited by anesthesia. These results clearly showed that the stiffness changes in the starfish dermis were based on a non-muscular mechanism that was similar to that of other echinoderm connective tissues with mechanical mutability.
    • Accession Number:
      N9YNS0M02X (Acetylcholine)
      RWP5GA015D (Potassium)
    • Publication Date:
      Date Created: 20111222 Date Completed: 20120417 Latest Revision: 20131121
    • Publication Date:
      20240829
    • Accession Number:
      10.1086/BBLv221n3p280
    • Accession Number:
      22186916