Development of an experimental model for radiation-induced inhibition of cranial bone regeneration
10.1186/s40902-018-0173-1
- Author:
Hong Moon JUNG
1
;
Jeong Eun LEE
;
Seoung Jun LEE
;
Jung Tae LEE
;
Tae Yub KWON
;
Tae Geon KWON
Author Information
1. Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University, 2177 Dalgubeol-daero, Jung-gu, Daegu, 41940 Republic of Korea. kwondk@knu.ac.kr.
- Publication Type:Original Article
- Keywords:
Radiation;
Bone;
Regeneration;
Calvaria;
Defect
- MeSH:
Animals;
Bone Morphogenetic Protein 2;
Bone Regeneration;
Chemokines;
Collagen;
Head and Neck Neoplasms;
Mice;
Models, Animal;
Models, Theoretical;
Osteogenesis;
Regeneration;
Skull
- From:Maxillofacial Plastic and Reconstructive Surgery
2018;40(1):34-
- CountryRepublic of Korea
- Language:English
-
Abstract:
BACKGROUND: Radiation therapy is widely employed in the treatment of head and neck cancer. Adverse effects of therapeutic irradiation include delayed bone healing after dental extraction or impaired bone regeneration at the irradiated bony defect. Development of a reliable experimental model may be beneficial to study tissue regeneration in the irradiated field. The current study aimed to develop a relevant animal model of post-radiation cranial bone defect. METHODS: A lead shielding block was designed for selective external irradiation of the mouse calvaria. Critical-size calvarial defect was created 2 weeks after the irradiation. The defect was filled with a collagen scaffold, with or without incorporation of bone morphogenetic protein 2 (BMP-2) (1 μg/ml). The non-irradiated mice treated with or without BMP-2-included scaffold served as control. Four weeks after the surgery, the specimens were harvested and the degree of bone formation was evaluated by histological and radiographical examinations. RESULTS: BMP-2-treated scaffold yielded significant bone regeneration in the mice calvarial defects. However, a single fraction of external irradiation was observed to eliminate the bone regeneration capacity of the BMP-2-incorporated scaffold without influencing the survival of the animals. CONCLUSION: The current study established an efficient model for post-radiation cranial bone regeneration and can be applied for evaluating the robust bone formation system using various chemokines or agents in unfavorable, demanding radiation-related bone defect models.
