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In vitro cellular testing of Strontium/Calcium substituted phosphate glass discs and microspheres shows potential for bone regeneration

Patel, Uresha; Macri-Pellizzeri, Laura; Hossain, Kazi M. Zakir; Scammell, Brigitte E.; Grant, David M.; Scotchford, Colin A.; Hannon, Alex C.; Kennedy, Andrew R.; Barney, Emma R.; Ahmed, Ifty; Sottile, Virginie


Uresha Patel

Kazi M. Zakir Hossain

Dean of The School of Medicine/ professor of Orthopaedic Sciences

Professor of Materials Science

Alex C. Hannon

Andrew R. Kennedy

Virginie Sottile


Phosphate glasses (PBG) are ideal materials for regenerative medicine strategies since their composition, degradation rates and ion release profiles can easily be controlled. Strontium has previously been found to simultaneously affect bone resorption and deposition. Therefore, by combining the inherent properties of resorbable PBG and therapeutic activity of strontium, these glasses could be used as a delivery device of therapeutic factors for the treatment of orthopaedic diseases such as osteoporosis.
This study shows the cytocompatibility and osteogenic potential of phosphate based glasses where CaO is gradually replaced by SrO in the near invert glass system 40P2O5·(16-x)CaO·20Na2O·24MgO·xSrO (x= 0, 4, 8, 12 and 16 mol %). Direct seeding of MG63 cells onto glass discs showed no significant difference in cell metabolic activity and DNA amount measurement across the different formulations studied. Cell attachment and spreading was confirmed via SEM imaging at days 3 and 14. Alkaline phosphatase (ALP) activity was similarly maintained across the glass compositions. Follow-on studies explored the effect of each glass composition in microsphere conformation (size: 63-125μm) on hMSCs in 3D cultures and analysis of cell metabolic activity and ALP activity showed no significant differences at day14 over the compositional range investigated, in line with the observations from MG63 cell culture studies. ESEM and live cell imaging at day14 of hMSCs seeded on the microspheres showed cell attachment and colonisation of the microsphere surfaces, confirming these formulations as promising candidates for regenerative medicine strategies addressing compromised musculoskeletal/orthopaedic diseases.

Journal Article Type Article
Publication Date 2019-03
Journal Journal of Tissue Engineering and Regenerative Medicine
Print ISSN 1932-6254
Electronic ISSN 1873-2577
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 13
Issue 3
Pages 396-405
APA6 Citation Patel, U., Macri-Pellizzeri, L., Hossain, K. M. Z., Scammell, B. E., Grant, D. M., Scotchford, C. A., …Sottile, V. (2019). In vitro cellular testing of Strontium/Calcium substituted phosphate glass discs and microspheres shows potential for bone regeneration. Journal of Tissue Engineering and Regenerative Medicine, 13(3), 396-405.
Keywords Bone Regeneration; Calcium phosphate glass; Stem cells; Strontium; Microspheres; Bioactive glass
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