Effect of Escherichia coli-produced recombinant human bone morphogenetic protein 2 on the regeneration of canine segmental ulnar defects

Because bone morphogenetic protein 2 gene transfected Escherichia coli (E-BMP-2) produce recombinant human BMP-2 (rhBMP-2) more efficiently than mammalian cells (Chinese hamster ovary [CHO]-BMP-2), they may be a more cost-effective source of rhBMP-2 for clinical use. However, use of E-BMP-2 for rege...

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Veröffentlicht in:Journal of bone and mineral metabolism 2012-07, Vol.30 (4), p.388-399
Hauptverfasser: Harada, Yasuji, Itoi, Takamasa, Wakitani, Shigeyuki, Irie, Hiroyuki, Sakamoto, Michiko, Zhao, Dongwei, Nezu, Yoshinori, Yogo, Takuya, Hara, Yasushi, Tagawa, Masahiro
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container_end_page 399
container_issue 4
container_start_page 388
container_title Journal of bone and mineral metabolism
container_volume 30
creator Harada, Yasuji
Itoi, Takamasa
Wakitani, Shigeyuki
Irie, Hiroyuki
Sakamoto, Michiko
Zhao, Dongwei
Nezu, Yoshinori
Yogo, Takuya
Hara, Yasushi
Tagawa, Masahiro
description Because bone morphogenetic protein 2 gene transfected Escherichia coli (E-BMP-2) produce recombinant human BMP-2 (rhBMP-2) more efficiently than mammalian cells (Chinese hamster ovary [CHO]-BMP-2), they may be a more cost-effective source of rhBMP-2 for clinical use. However, use of E-BMP-2 for regenerating long bones in large animals has not been reported. In the current study, we evaluated the healing efficacy of E-BMP-2 in a canine model. We created 2.5-cm critical-size segmental ulnar defects in test animals, then implanted E-BMP-2 and 700 mg of artificial bone (beta-tricalcium phosphate; β-TCP) into the wounds. We examined the differential effects of 5 E-BMP-2 treatments (0, 35, 140, 560, and 2240 μg) across 5 experimental groups (control, BMP35, BMP140, BMP560, and BMP2240). Radiography and computed tomography were used to observe the regeneration process. The groups in which higher doses of E-BMP-2 were administered (BMP560 and BMP2240) displayed more pronounced bone regeneration; the regenerated tissues connected to the host bone, and the cross-sectional areas of the regenerated bone were larger than those of the originals. The groups in which lower doses of E-BMP-2 were administered (BMP35 and BMP140) experienced relatively less bone regeneration; furthermore, the regenerated tissues failed to connect to the host bone. In these groups, the cross-sectional areas of the regenerated bone were equal to or smaller than those of the originals. No regeneration was observed in the control group. These findings suggest that, like CHO-BMP-2, E-BMP-2 can be used for the regeneration of large defects in long bones and that its clinical use might decrease the cost of bone regeneration treatments.
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However, use of E-BMP-2 for regenerating long bones in large animals has not been reported. In the current study, we evaluated the healing efficacy of E-BMP-2 in a canine model. We created 2.5-cm critical-size segmental ulnar defects in test animals, then implanted E-BMP-2 and 700 mg of artificial bone (beta-tricalcium phosphate; β-TCP) into the wounds. We examined the differential effects of 5 E-BMP-2 treatments (0, 35, 140, 560, and 2240 μg) across 5 experimental groups (control, BMP35, BMP140, BMP560, and BMP2240). Radiography and computed tomography were used to observe the regeneration process. The groups in which higher doses of E-BMP-2 were administered (BMP560 and BMP2240) displayed more pronounced bone regeneration; the regenerated tissues connected to the host bone, and the cross-sectional areas of the regenerated bone were larger than those of the originals. The groups in which lower doses of E-BMP-2 were administered (BMP35 and BMP140) experienced relatively less bone regeneration; furthermore, the regenerated tissues failed to connect to the host bone. In these groups, the cross-sectional areas of the regenerated bone were equal to or smaller than those of the originals. No regeneration was observed in the control group. 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The groups in which lower doses of E-BMP-2 were administered (BMP35 and BMP140) experienced relatively less bone regeneration; furthermore, the regenerated tissues failed to connect to the host bone. In these groups, the cross-sectional areas of the regenerated bone were equal to or smaller than those of the originals. No regeneration was observed in the control group. 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subjects Animals
Biocompatible Materials - chemistry
Biocompatible Materials - therapeutic use
Biological and medical sciences
Bone Density - drug effects
Bone Density Conservation Agents - administration & dosage
Bone Density Conservation Agents - metabolism
Bone Density Conservation Agents - therapeutic use
Bone Morphogenetic Protein 2 - administration & dosage
Bone Morphogenetic Protein 2 - biosynthesis
Bone Morphogenetic Protein 2 - therapeutic use
Bone Regeneration - drug effects
Bone Resorption - prevention & control
Bony Callus - drug effects
Bony Callus - pathology
Calcium Phosphates - chemistry
Calcium Phosphates - therapeutic use
Disease Models, Animal
Diseases of the osteoarticular system
Dogs
Dose-Response Relationship, Drug
Drug Delivery Systems
Escherichia coli - metabolism
Female
Humans
Implants, Experimental
Indexing in process
Medical sciences
Medicine
Medicine & Public Health
Metabolic Diseases
Original Article
Orthopedics
Recombinant Proteins - administration & dosage
Recombinant Proteins - biosynthesis
Recombinant Proteins - therapeutic use
Ulna - drug effects
Ulna - injuries
Ulna - pathology
Ulna Fractures - drug therapy
Ulna Fractures - pathology
Ulna Fractures - therapy
title Effect of Escherichia coli-produced recombinant human bone morphogenetic protein 2 on the regeneration of canine segmental ulnar defects
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