Comparison of annulus fibrosus cell collagen remodeling rates in a microtissue system

Isabel N Tromp, Jasper Foolen, Marina van Doeselaar, Ying Zhang, Danny Chan, Moyo C Kruyt, Laura B Creemers, Rene M Castelein, Keita Ito

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Abstract

It has been suggested that curvature progression in adolescent idiopathic scoliosis occurs through irreversible changes in the intervertebral discs. Strains of mice have been identified who differ in their disc wedging response upon extended asymmetrical compression. Annulus fibrosus (AF) tissue remodeling could contribute to the faster disc wedging progression previously observed in these mice. Differences in collagen remodeling capacity of AF cells between these in-bred mice strains were compared using an in vitro microtissue system. AF cells of 8-10-week-old LG/J ("fast-healing") and C57BL/6J ("normal healing") mice were embedded in a microtissue platform and cultured for 48 h. Hereafter, tissues were partially released and cultured for another 96 h. Microtissue surface area and waistcoat contraction, collagen orientation, and collagen content were measured. After 96 h postrelease, microtissues with AF cells of LG/J mice showed more surface area contraction (p < .001) and waistcoat contraction (p = .002) than C57BL/6J microtissues. Collagen orientation did not differ at 24 h after partial release. However, at 96 h, collagen in the microtissues from LG/J AF cells was aligned more than in those from C57BL/6J mice (p < .001). Collagen content did not differ between microtissues at 96 h. AF cells of inbred LG/J mice were better able to remodel and realign their collagen fibers than those from C57BL/6J mice. The remodeling of AF tissue could be contributing to the faster disc wedging progression observed in LG/J mice.

Original languageEnglish
Pages (from-to)1955-1964
Number of pages10
JournalJournal of Orthopaedic Research
Volume39
Issue number9
Early online date1 Dec 2020
DOIs
Publication statusPublished - Sept 2021

Keywords

  • annulus fibrosus
  • collagen
  • intervertebral disc
  • matrix remodeling
  • scoliosis

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