Scientific Reports (Apr 2017)

Cartilage Tissue Engineering by the 3D Bioprinting of iPS Cells in a Nanocellulose/Alginate Bioink

  • Duong Nguyen,
  • Daniel A. Hägg,
  • Alma Forsman,
  • Josefine Ekholm,
  • Puwapong Nimkingratana,
  • Camilla Brantsing,
  • Theodoros Kalogeropoulos,
  • Samantha Zaunz,
  • Sebastian Concaro,
  • Mats Brittberg,
  • Anders Lindahl,
  • Paul Gatenholm,
  • Annika Enejder,
  • Stina Simonsson

DOI
https://doi.org/10.1038/s41598-017-00690-y
Journal volume & issue
Vol. 7, no. 1
pp. 1 – 10

Abstract

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Cartilage lesions can progress into secondary osteoarthritis and cause severe clinical problems in numerous patients. As a prospective treatment of such lesions, human-derived induced pluripotent stem cells (iPSCs) were shown to be 3D bioprinted into cartilage mimics using a nanofibrillated cellulose (NFC) composite bioink when co-printed with irradiated human chondrocytes. Two bioinks were investigated: NFC with alginate (NFC/A) or hyaluronic acid (NFC/HA). Low proliferation and phenotypic changes away from pluripotency were seen in the case of NFC/HA. However, in the case of the 3D-bioprinted NFC/A (60/40, dry weight % ratio) constructs, pluripotency was initially maintained, and after five weeks, hyaline-like cartilaginous tissue with collagen type II expression and lacking tumorigenic Oct4 expression was observed in 3D -bioprinted NFC/A (60/40, dry weight % relation) constructs. Moreover, a marked increase in cell number within the cartilaginous tissue was detected by 2-photon fluorescence microscopy, indicating the importance of high cell densities in the pursuit of achieving good survival after printing. We conclude that NFC/A bioink is suitable for bioprinting iPSCs to support cartilage production in co-cultures with irradiated chondrocytes.