A novel bioactive porous bredigite (Ca7MgSi4O16) scaffold with biomimetic apatite layer for bone tissue engineering

Our plain-English summary of A novel bioactive porous bredigite (Ca7MgSi4O16) scaffold with biomimetic apatite layer for bone tissue engineering, by C. Wu, J. Chang, W. Zhai, et al (Journal of Materials Science. Materials in Medicine, 2007).

The study

• Authors: C. Wu, J. Chang, W. Zhai, S. Ni
• Journal: Journal of Materials Science. Materials in Medicine
• Published: 2007;18(5):857-64
• Cited by: 59 articles, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

The aim of this study was to develop a novel bioactive, degradable and cytocompatible bredigite (Ca(7)MgSi(4)O(16)) scaffold with biomimetic apatite layer for bone tissue engineering. Porous bredigite scaffolds were prepared using polymer sponge method. The bredigite scaffolds with biomimetic apatite layer (BTAP) were obtained by soaking bredigite scaffolds in simulated body fluid (SBF) for 10 days. The porosity and in vitro degradability of BTAP scaffolds were investigated. In addition, osteoblast-like cell morphology, proliferation and differentiation on BTAP scaffolds were evaluated and compared with beta-tricalcium phosphate (beta-TCP) scaffolds. The results showed that BTAP scaffolds possessed 90% of porosity. The degradation of BTAP scaffolds was comparable to that of beta-TCP scaffolds. Cells on BTAP scaffolds spread well and presented a higher proliferation rate and differentiation level as compared with those on beta-TCP scaffolds. Our results indicated that BTAP scaffolds were degradable and possessed the function to enhance cell proliferation and differentiation, and might be used as bone tissue engineering materials.

In plain English

In this laboratory study, the authors made porous scaffolds from bredigite, a calcium magnesium silicate ceramic, as a support for growing bone tissue. Soaking them in simulated body fluid for 10 days coated them with a bone-like mineral layer called apatite. The coated scaffolds were called BTAP. The authors compared BTAP scaffolds with scaffolds of beta-tricalcium phosphate, an existing bone-repair material, using bone-forming cells taken from the skulls of newborn rats. BTAP scaffolds had about 90% porosity and pores of about 300 to 500 micrometres. Their compressive strength was 101 kPa, against 50 kPa for beta-tricalcium phosphate. Their weight loss in Ringer's solution over periods of up to 28 days was comparable to that of the comparison scaffolds. After 7 days, cells on BTAP scaffolds multiplied faster. They also showed higher alkaline phosphatase activity, an early marker of bone-cell development (p less than 0.05). The authors concluded the scaffolds may be used for bone tissue engineering. They said further study is needed to confirm how the scaffolds break down in the body.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Laboratory (in vitro) materials and cell-culture study comparing bredigite scaffolds with an apatite layer (BTAP) against beta-tricalcium phosphate (beta-TCP) control scaffolds
• Who was studied: Osteoblast-like (bone-forming) cells isolated from the skull bones (calvaria) of neonatal Sprague-Dawley rats less than 2 days old, grown on the scaffolds. Data were from 6 samples per group.
• Exposure: No asbestos exposure was studied. Cells were grown on porous bredigite (Ca7MgSi4O16) scaffolds coated with apatite by soaking in simulated body fluid for 10 days (BTAP), or on beta-TCP scaffolds, for 1, 3, 7 and 14 days.
• Main results:
  • BTAP scaffolds had a porosity of about 90%.
  • Pores in the bredigite scaffolds were about 300 to 500 micrometres in size.
  • Compressive strength was 101 kPa for BTAP scaffolds, lower than pure bredigite scaffolds (233 kPa) but higher than beta-TCP scaffolds (50 kPa).
  • Weight loss of BTAP scaffolds in Ringer's solution increased with soaking time and was comparable to that of beta-TCP scaffolds.
  • After 7 days of culture, cells on BTAP scaffolds showed a higher proliferation rate than cells on beta-TCP scaffolds (p less than 0.05).
  • Cells on BTAP scaffolds showed higher alkaline phosphatase (ALP) activity than cells on beta-TCP scaffolds, measured on days 3 and 7 (p less than 0.05).
  • After 7 days, the culture medium with BTAP scaffolds had higher Si (1.59 mM vs 0) and Mg (0.67 mM vs 0.20 mM) levels than the medium with beta-TCP scaffolds.
• The authors' conclusion: The authors concluded that bredigite scaffolds with a biomimetic apatite layer are degradable, support cell attachment, stimulate cell proliferation and differentiation, and may be used as scaffolds for bone tissue engineering.
• Limitations the authors state:
  • Degradation was tested only in solution in the laboratory. The authors stated that further study is needed to confirm how the scaffolds degrade in the body (in vivo).

Topics

The National Library of Medicine indexes this study under subjects our site covers: Tremolite.

Medical terms in this study, explained in our Lexicon: Simulated Body Fluid.

Related studies

• Preparation and characteristics of a calcium magnesium silicate (bredigite) bioactive ceramic — C. Wu, J. Chang, et al. (2005)
• Bioactive bredigite coating with improved bonding strength, rapid apatite mineralization and excellent cytocompatibility — D. Yi, C. Wu, et al. (2014)
• Degradation, bioactivity, and cytocompatibility of diopside, akermanite, and bredigite ceramics — C. Wu, J. Chang (2007)
• 3D-printed bredigite scaffolds with ordered arrangement structures promote bone regeneration by inducing macrophage polarization in onlay grafts — Y. Xuan, Y. Guo, et al. (2024)
• Synthesis and in vitro bioactivity of bredigite powders — C. Wu, J. Chang (2007)
• Biodegradable mesoporous calcium-magnesium silicate-polybutylene succinate scaffolds for osseous tissue engineering — X. Zhang, C. Zhang, et al. (2015)

Browse return to medical research.