Prevention of radiation-induced bone pathology through combined pharmacologic cytoprotection and angiogenic stimulation.
Bone
; 84: 245-252, 2016 Mar.
Article
em En
| MEDLINE
| ID: mdl-26723578
ABSTRACT
Pathologic fractures and associated non-unions arising in previously irradiated bone are severely debilitating diseases. Although radiation is known to have deleterious effects on healthy tissue cellularity and vascularity, no clinically accepted pharmacologic interventions currently exist to target these destructive mechanisms within osseous tissues. We utilized amifostine-a cellular radioprotectant-and deferoxamine-an angiogenic stimulant-to simultaneously target the cellular and vascular niches within irradiated bone in a rat model of mandibular fracture repair following irradiation. Rats treated with combined therapy were compared to those undergoing treatment with singular amifostine or deferoxamine therapy, nontreated/irradiated animals (XFx) and non-treated/non-irradiated animals (Fx). 3D angiographic modeling, histology, Bone Mineral Density Distribution and mechanical metrics were utilized to assess therapeutic efficacy. We observed diminished metrics for all outcomes when comparing XFx to Fx alone, indicating the damaging effects of radiation. Across all outcomes, only the combined treatment group improved upon XFx levels, normalized all metrics to Fx levels, and was consistently as good as, or superior to the other treatment options (p<0.05). Collectively, our data demonstrate that pharmacologically targeting the cellular and vascular environments within irradiated bone prevents bone injury and enhances fracture healing.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Lesões por Radiação
/
Doenças Ósseas
/
Amifostina
/
Neovascularização Fisiológica
/
Citoproteção
/
Desferroxamina
Tipo de estudo:
Etiology_studies
Limite:
Animals
Idioma:
En
Revista:
Bone
Assunto da revista:
METABOLISMO
/
ORTOPEDIA
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Estados Unidos