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Bone tissue engineering: Attaching proteins for better regeneration

Date:
July 29, 2012
Source:
International Center for Materials Nanoarchitectonics (MANA)
Summary:
Researchers have demonstrated a new protein binding approach for effectively promoting bone regeneration. Current treatments for bone defects and bone tissue regeneration have significant limitations. Now a new method that immobilizes a fusion protein in a hybrid collagen-polymer supportive scaffold shows promise for bone tissue engineering.

Scientists added a collagen-binding domain from fibronectin to BMP4, a protein that promotes bone regeneration. The new fusion protein, BMP4-CBD, was used in a scaffold of natural collagen sponge and a strong synthetic polymer, poly(lactic-co-glycolic acid) (PLGA). The scaffold provides space and support for the bone cell growth.
Credit: Copyright MANA

Researchers in Japan demonstrate a new protein binding approach for effectively promoting bone regeneration. Current treatments for bone defects and bone tissue regeneration have significant limitations. Now a new method that immobilises a fusion protein in a hybrid collagen-polymer supportive scaffold shows promise for bone tissue engineering.

Guoping Chen, Yoshihiro Ito and researchers at the Tissue Regeneration Materials Unit, International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science, RIKEN, the Immuno-Biological Laboratories Co., Ltd, and the National Institute for Child Health and Development, Tokyo, added a collagen-binding domain from fibronectin to BMP4, a protein that promotes bone regeneration. The new fusion protein, BMP4-CBD, was used in a scaffold of natural collagen sponge and a strong synthetic polymer, poly(lactic-co-glycolic acid) (PLGA). The scaffold provides space and support for the bone cell growth.

The researchers investigated the BMP4-CBD immobilized on the collagen-PLGA scaffold cultured in vivo for four weeks. They compared the approach with a range of controls including scaffolds with wild-type BMP4 without the collagen-binding domain and scaffolds with just the collagen-binding domain. The expression of specific and non-specific osteogenetic markers used as indicators of bone tissue regeneration was much higher for BMP4-CBD. Using BMP4-CBD also initiated calcification.

"These effects should be attributed to the retention of more effective molecules due to the specific binding of the fusion BMP4 to the collagen," say the authors. The stimulation effect of the protein promoting the bone regeneration is thus maintained over a longer period. The research may benefit patients suffering from bone defects in the future.


Story Source:

The above story is based on materials provided by International Center for Materials Nanoarchitectonics (MANA). Note: Materials may be edited for content and length.


Journal Reference:

  1. Hongxu Lu, Naoki Kawazoe, Takashi Kitajima, Yuka Myoken, Masahiro Tomita, Akihiro Umezawa, Guoping Chen, Yoshihiro Ito. Spatial immobilization of bone morphogenetic protein-4 in a collagen-PLGA hybrid scaffold for enhanced osteoinductivity. Biomaterials, 2012; 33 (26): 6140 DOI: 10.1016/j.biomaterials.2012.05.038

Cite This Page:

International Center for Materials Nanoarchitectonics (MANA). "Bone tissue engineering: Attaching proteins for better regeneration." ScienceDaily. ScienceDaily, 29 July 2012. <www.sciencedaily.com/releases/2012/07/120729142100.htm>.
International Center for Materials Nanoarchitectonics (MANA). (2012, July 29). Bone tissue engineering: Attaching proteins for better regeneration. ScienceDaily. Retrieved July 23, 2014 from www.sciencedaily.com/releases/2012/07/120729142100.htm
International Center for Materials Nanoarchitectonics (MANA). "Bone tissue engineering: Attaching proteins for better regeneration." ScienceDaily. www.sciencedaily.com/releases/2012/07/120729142100.htm (accessed July 23, 2014).

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