Postnatal exvivo rat model for longitudinal bone growth investigations

Animal Models and Experimental Medicine

article

Adamu Abdul Abubakar¹  Sahar Mohammed Ibrahim¹  Ahmed Khalaf Ali¹  Kareem Obayes Handool¹  Mohammad Shuaib Khan¹  Mohamed Noordin Mustapha⁵  Tengku Azmi Ibrahim⁶  Ubedullah Kaka⁷  Loqman Mohamad Yusof¹ 

[1] Department of Companion Animal Medicine and Surgery, Universiti Putra Malaysia;Department of Veterinary Surgery and Radiology, Usmanu Danfodiyo University;Department of Surgery and Theriogenology, College of Veterinary Medicine, University of Mosul;Faculty of Veterinary and Animal Science, Gomal University;Department of Veterinary Pathology and Microbiology, Universiti Putra Malaysia;Department of Pre-Clinical Veterinary Sciences, Universiti Putra Malaysia;Laboratory of Sustainable Animal Production and Biodiversity, Institute of Tropical Agriculture and Food Security, Universiti Putra Malaysia

关键词: bone growth model;    chondrocytes;    endochondral ossification;    growth plate;    Sprague-Dawley rat;   

DOI  :  10.1002/ame2.12051

学科分类：机械工程学

来源: Wiley

【 摘 要 】

Background: Chondrocytes in the growth plate (GP) undergo increases in volume during different cascades of cell differentiation during longitudinal bone growth. The volume increase is reported to be the most significant variable in understanding the mechanism of long bone growth. Methods: Forty‐five postnatal Sprague‐Dawley rat pups, 7‐15 days old were divided into nine age groups (P7‐P15). Five pups were allocated to each group. The rats were sacrificed and tibia and metatarsal bones were harvested. Bone lengths were measured after 0, 24, 48, and 72 hours of ex vivo incubation. Histology of bones was carried out, and GP lengths and chondrocyte densities were determined. Results: There were significant differences in bone length among the age groups after 0 and 72 hours of incubation. Histological sectioning was possible in metatarsal bone from all age groups, and in tibia from 7‐ to 13‐day‐old rats. No significant differences in tibia and metatarsal GP lengths were seen among different age groups at 0 and 72 hours of incubation. Significant differences in chondrocyte densities along the epiphyseal GP of the bones between 0 and 72 hours of incubation were observed in most of the age groups. Conclusion: Ex vivo growth of tibia and metatarsal bones of rats aged 7‐15 days old is possible, with percentage growth rates of 23.87 ± 0.80% and 40.38 ± 0.95% measured in tibia and metatarsal bone, respectively. Histological sectioning of bones was carried out without the need for decalcification in P7‐P13 tibia and P7‐P15 metatarsal bone. Increases in chondrocyte density along the GP influence overall bone elongation.

【 授权许可】

CC BY|CC BY-NC|CC BY-NC-ND