Bioinspired gelatin/bioceramic composites loaded with bone morphogenetic protein-2 (BMP-2) promote osteoporotic bone repair

  1. Golafshan, N.
  2. Reyes, R. 1
  3. Pimenta-Lopes, C.
  4. García-García, P.
  5. Echave, M.C.
  6. Jimenez, J.J.
  7. Pujol, A.
  8. Ventura, F.
  9. Pedraz, J.L.
  10. Orive, G.
  11. Azkargorta, M.
  12. Elortza, F.
  13. Castilho, M.
  14. Lakshminarayanan, R.
  15. Iturriaga, L.
  16. Camara, J.A.
  17. Iloro, I.
  18. Hernáez-Moya, R.
  19. Dolatshahi-Pirouz, A.
  20. Évora, C.
  21. Al-Tel, T.H.
  22. Kadumudi, F.B.
  23. Delgado, A.
  24. Erezuma, I.
  25. Sáenz Del Burgo, L.
  1. 1 Universidad de La Laguna
    info

    Universidad de La Laguna

    San Cristobal de La Laguna, España

    ROR https://ror.org/01r9z8p25

Journal:
Materials Science and Engineering: C

ISSN: 0928-4931

Year of publication: 2021

Pages: 112539

Type: Article

DOI: 10.1016/J.MSEC.2021.112539 GOOGLE SCHOLAR lock_openOpen access editor

More publications in: Materials Science and Engineering: C

Sustainable development goals

Abstract

There are currently several commercialized products approved by the Food and Drug Administration and the European Medicines Agency based on the use of recombinant human BMP-2 for the treatment of non-unions long fractures and spinal fusion. However, the adverse effects recorded with the use of BMPs suggest the need for drug delivery carriers that allow reducing the required doses and improve their cost-effectiveness. Herein, we have developed a new osteoconductive scaffold that reduces the required doses of BMP-2 for promoting bone regeneration in an osteoporotic defect model. The composite is, in brief, a gelatin-based 3D scaffold reinforced with either calcium sulfate or hydroxyapatite as an inorganic osteoconductive biomaterial. To this end, the organic/inorganic composite systems showed high hydration capacity and good in vitro degradability. The incorporation of 7.5% (m/v) ceramic compounds resulted in scaffolds with stiffer Young modulus (179 and 75 kPa for CaSO4_7 and HA_7, respectively) than bare gelatin hydrogels (48 kPa). Studies with human bone-marrow derived mesenchymal stem cells (hBM-MSCs) revealed that the 3D scaffolds promote cell adhesion and proliferation along with osteogenic differentiation capabilities. Specifically, downregulation of stemness (Nanog, Oct4) genes and upregulation of osteogenic markers (ALP, Col1a1, Fmod) by two fold were observed over 10 days under basal culture conditions. Promisingly, the sustained in vitro release of BMP-2 observed from the porous reinforced scaffolds allowed us to address the critical-sized osteoporotic mice calvarial defects with a relatively low growth factor doses (600 ng BMP-2/scaffold) compared to conventional doses at 2–15 micrograms. Overall, this study demonstrates the promising potential of osteoconductive gelatin/calcium bioceramics composites as osteogenic growth factors delivery carriers for bone-regeneration via ultra-low growth factor doses.