Mechanical properties of the compass depressors of the sea-urchin Paracentrotus lividus (Echinodermata, Echinoidea) and the effects of enzymes, neurotransmitters and synthetic tensilin-like protein

PloS One
Iain C WilkieMaria D Candia Carnevali

Abstract

The compass depressors (CDs) of the sea-urchin lantern are ligaments consisting mainly of discontinuous collagen fibrils associated with a small population of myocytes. They are mutable collagenous structures, which can change their mechanical properties rapidly and reversibly under nervous control. The aims of this investigation were to characterise the baseline (i.e. unmanipulated) static mechanical properties of the CDs of Paracentrotus lividus by means of creep tests and incremental force-extension tests, and to determine the effects on their mechanical behaviour of a range of agents. Under constant load the CDs exhibited a three-phase creep curve, the mean coefficient of viscosity being 561±365 MPa.s. The stress-strain curve showed toe, linear and yield regions; the mean strain at the toe-linear inflection was 0.86±0.61; the mean Young's modulus was 18.62±10.30 MPa; and the mean tensile strength was 8.14±5.73 MPa. Hyaluronidase from Streptomyces hyalurolyticus had no effect on creep behaviour, whilst chondroitinase ABC prolonged primary creep but had no effect on secondary creep or on any force-extension parameters; it thus appears that neither hyaluronic acid nor sulphated glycosaminoglycans have an interfibrillar load tr...Continue Reading

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Citations

Oct 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Jingyi MoHimadri S Gupta
Apr 26, 2017·International Journal of Molecular Sciences·Kheng Lim Goh, David F Holmes
Apr 13, 2018·PloS One·Igor Yu DolmatovAlexey V Boyko
Sep 15, 2020·Bioinspiration & Biomimetics·Valentina PerriconeMaria Daniela Candia Carnevali
Apr 10, 2021·Biomacromolecules·Dario FassiniRui L Reis

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