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Self-setting hydroxyapatite cement as a carrier for bone-forming cells

T Yoshikawa1, Y Suwa, H Ohgushi

  • 1Department of Orthopaedic Surgery, Nara Medical University, Japan.

Bio-Medical Materials and Engineering
|January 1, 1996
PubMed
Summary

This study investigated whether self-setting hydroxyapatite cement could be used as a carrier for bone-forming cells. Researchers created a porous form of the cement and combined it with cultured marrow cells from rats. The composites were implanted into other rats and examined after six weeks. The results showed that the material supported active bone formation and osteoblast activity. The porous structure allowed cells to integrate and form new bone. No cartilage formation was observed, and the implants caused minimal immune response. The findings suggest that this composite could serve as a bone graft substitute and a delivery system for bone-forming cells.

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Area of Science:

  • Tissue engineering in regenerative medicine
  • Bone graft materials in orthopedic surgery

Background:

The development of effective bone graft substitutes remains a critical challenge in orthopedic surgery. While natural bone grafts offer osteoconductive and osteoinductive properties, their availability is limited, and synthetic alternatives often lack sufficient biological activity. Prior research has shown that hydroxyapatite-based materials can support bone regeneration, but their integration with living cells has not been fully explored. This gap motivated the investigation of self-setting hydroxyapatite cement as a potential scaffold for bone-forming cells. Existing studies have demonstrated the osteogenic potential of marrow-derived cells, but their delivery via synthetic carriers remains underdeveloped. The need for a biocompatible and osteoconductive material that supports cell viability and function is well established. No prior work had resolved how marrow cells interact with self-setting hydroxyapatite in vivo. This paper aims to address these limitations by evaluating a novel composite system.

Purpose Of The Study:

Keywords:
bone graft substitutehydroxyapatite cementosteogenic activitybone-forming cellstissue engineering

Frequently Asked Questions

The study found that self-setting hydroxyapatite cement combined with marrow cells promotes active bone formation and supports osteoblast activity.

Marrow cells were isolated from rat femurs, cultured in Eagle's MEM with 15% fetal bovine serum for ten days, and then mixed with the cement.

The porous structure allowed for cell infiltration, nutrient exchange, and tissue integration, which are essential for bone regeneration.

It served as a control to compare the osteogenic potential of the self-setting hydroxyapatite cement with a conventional hydroxyapatite material.

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The goal of this research was to assess whether self-setting hydroxyapatite cement could serve as a suitable carrier for bone-forming cells. Specifically, the study aimed to determine if this material could support the osteogenic activity of cultured marrow cells. The researchers focused on a porous form of the cement to facilitate cell infiltration and nutrient exchange. They compared this material to a conventional hydroxyapatite control to evaluate relative performance. The motivation for this work stemmed from the need for a reliable bone graft substitute that integrates biological and mechanical functions. The study sought to bridge the gap between synthetic scaffolds and living cell delivery systems. By testing the osteogenic potential of the composite in vivo, the researchers aimed to provide evidence for its clinical applicability. The ultimate objective was to establish a foundation for future studies on cell-based bone regeneration.

Main Methods:

The researchers fabricated a porous form of self-setting hydroxyapatite cement and combined it with cultured marrow cells. Marrow cells were isolated from the femurs of a seven-week-old male Fischer 344 rat and cultured in Eagle's MEM with 15% fetal bovine serum for ten days. The cultured cells were then mixed with the hydroxyapatite cement or with Interpore 200 hydroxyapatite as a control. The resulting composites were implanted subcutaneously into syngeneic rats. After six weeks, the implants were harvested for histological analysis. The study evaluated the presence of active osteoblasts and new bone formation in contact with the material. Researchers also assessed the degree of foreign body reaction in the implants. The experimental design allowed for a direct comparison between the two hydroxyapatite types with and without marrow cells.

Main Results:

Both types of implants showed active osteoblasts and new bone formation in contact with the pore surfaces. The presence of marrow cells significantly enhanced the osteogenic activity of the hydroxyapatite composites. No cartilage formation was observed in any of the pores, indicating a direct osteogenic effect. The self-setting hydroxyapatite cement demonstrated comparable osteogenic potential to the conventional hydroxyapatite control. The implants with and without marrow cells caused minimal foreign body reactions, suggesting good biocompatibility. The porous structure of the cement supported cell infiltration and tissue integration. Histological findings confirmed the viability of marrow cells within the cement matrix. These results suggest that the composite material may serve as a functional bone graft substitute.

Conclusions:

The study demonstrates that self-setting hydroxyapatite cement can support the osteogenic activity of marrow cells. The presence of active osteoblasts and new bone formation in the implants supports the material's potential as a bone graft substitute. The lack of cartilage formation suggests that the composite promotes direct bone regeneration. The minimal foreign body reaction indicates that the material is well tolerated in vivo. The porous structure of the cement facilitates cell integration and tissue formation. The results suggest that this composite could be used as a novel delivery system for bone-forming cells. The findings align with the authors' hypothesis that the material supports osteogenesis. These conclusions are based on the observed histological and biological responses in the implants.

The composites were implanted for six weeks before being harvested for histological analysis.

The authors suggest that the composite may be useful as a bone graft substitute and a novel delivery system for bone-forming cells.