Bone healing in drill hole defects in spontaneously hypertensive male and female rats' femurs: a histological and histometric study



Document title: Bone healing in drill hole defects in spontaneously hypertensive male and female rats' femurs: a histological and histometric study
Journal: Arquivos brasileiros de cardiologia
Database: PERIÓDICA
System number: 000289170
ISSN: 0066-782X
Authors: 1
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Institutions: 1Universidade Estadual Paulista "Julio de Mesquita Filho", Sao Jose dos Campos, Sao Paulo. Brasil
Year:
Season: Ene
Volumen: 88
Number: 1
Pages: 104-109
Country: Brasil
Language: Portugués, inglés
Document type: Artículo
Approach: Experimental
English abstract OBJECTIVE: The aim of this study was to evaluate the bone healing in spontaneously hypertensive rats (SHR) and compare the results with normotensive rats, evaluating male and female animals. METHODS: A bone drill defect was created in the left femur of 24 SHR (12 males and 12 females) and 24 normotensive rats (12 males and 12 females). The animals were divided into two groups and sacrificed 7 and 21 days after the surgical procedure. After the routine laboratory processing, histological and histometric analysis were carried out and data were submitted to ANOVA and Tukey’s test (5%). RESULTS: Males and females from the same group had similar histological characteristics. After seven days, all animals presented irregular bone trabeculae. The periosteal osteoblasts were flattened in SHR, and presented a cuboid shape in normotensive animals. After 21 days, the bone defects of all specimens showed a linear closure in all the superficial extension. In addition, SHR presented flattened osteoblasts surrounding the bone trabeculae, while normotensive ones showed cuboidal cells. Statistical analysis of the histometric data indicated similar means between the male and female groups, except for normotensive rats on day 7. In addition, a larger amount of new bone formation was observed in hypertensive when compared to normotensive rats on day 21, in males as well as females. CONCLUSION: We conclude that bone healing in SHR was more significant than in normotensive ones, as shown by the histological and histometric evaluation 21 days after surgery
Portuguese abstract OBJETIVO: O objetivo deste estudo foi avaliar a reparação óssea em ratos espontaneamente hipertensos (SHR) e compará-la com a de ratos normotensos, avaliando machos e fêmeas. MÉTODOS: Um defeito ósseo foi criado no fêmur esquerdo de 24 SHR (12 machos e 12 fêmeas) e 24 ratos normotensos (12 machos e 12 fêmeas). Os animais foram divididos em dois grupos com diferentes períodos de sacrifício: sete e 21 dias após o procedimento cirúrgico. Após processamento laboratorial de rotina, as análises histológica e histométrica foram realizadas e os dados submetidos à análise de variância (ANOVA) e ao teste de Tukey (5%). RESULTADOS: Machos e fêmeas do mesmo grupo apresentaram características histológicas similares. Após sete dias, todos os animais apresentaram trabéculas ósseas irregulares, entretanto, os osteoblastos periosteais eram achatados nos SHR, enquanto nos normotensos, essas células apresentavam formato cúbico. Após 21 dias, todos os espécimes mostraram fechamento linear em toda a extensão superficial do defeito ósseo e os SHR apresentaram osteoblastos achatados, enquanto os normotensos apresentaram células cúbicas circundando as trabéculas ósseas. A análise estatística dos dados histométricos indicou médias similares entre machos e fêmeas, exceto para ratos normotensos, aos sete dias. Além disso, aos 21 dias, foi observada maior neoformação óssea nos ratos hipertensos quando comparados aos normotensos, tanto machos quanto fêmeas. CONCLUSÃO: Concluiu-se que os animais SHR apresentaram maior neoformação e maturidade óssea nos defeitos que animais normotensos, no período de 21 dias após a cirurgia
Disciplines: Medicina
Keyword: Medicina experimental,
Sistema cardiovascular,
Fémur,
Hipertensión arterial,
Reparación ósea,
Ratas
Keyword: Medicine,
Cardiovascular system,
Experimental medicine,
Femur,
Arterial hypertension,
Rats,
Bone healing
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