Published in:
01-04-2021 | Original Paper
Macrophages’ contribution to ectopic osteogenesis in combination with blood clot and bone substitute: possibility for application in bone regeneration strategies
Authors:
Jelena M. Živković, Sanja T. Stojanović, Marija Đ. Vukelić-Nikolić, Milena B. Radenković, Jelena G. Najdanović, Milan Ćirić, Stevo J. Najman
Published in:
International Orthopaedics
|
Issue 4/2021
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Abstract
Purpose
Given the great potential of macrophages in the processes of tissue repair and regeneration, the aim of our study was to examine the contribution that macrophages will have in osteogenic process when combined and implanted with blood clot (BC) and mineral bone substitute (MBS) in mice subcutaneous implantation model.
Methods
Three types of implants were constructed and implanted subcutaneously into BALB/c mice: (1) RMBM implants (made of resident tissue macrophages, BC and MBS), (2) BM implants (made of BC and MBS), and (3) M implants (made of MBS only) where the last two served as control implants. One, two, four and eight weeks after implantation implants were explanted, and histochemical, immunohistochemical, and histomorphometric analyses were performed.
Results
Increased vascularization, particularly pronounced two and four weeks after implantation and pronounced tissue infiltration in eight week term in RMBM implants compared with both other types, likewise the presence of osteoblast-like cells, osteoid-like structures, and more prominent osteopontin and osteocalcin immunoexpression in RMBM implants indicated more pronounced osteogenic process within them.
Conclusion
Our results suggest that macrophages deserve to be considered as a cell component when constructing implants in bone regenerative medicine strategies to improve bone fracture healing process.