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Postnatal ex vivo rat model for longitudinal bone growth investigations


Abubakar, Adamu Abdul and Ibrahim, Sahar Mohammed and Ali, Ahmed Khalaf and Handool, Kareem Obayes and Khan, Mohammad Shuaib and Noordin, Mohamed Mustapha and Ibrahim, Tengku Azmi and Kaka, Ubedullah and Mohamad Yusof, Loqman (2019) Postnatal ex vivo rat model for longitudinal bone growth investigations. Animal Models and Experimental Medicine, 2 (1). pp. 34-43. ISSN 2096-5451; ESSN: 2576-2095


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‐P15metatarsal bone. Increases in chondrocyte density along the GP influence overall bone elongation.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Veterinary Medicine
Institute of Tropical Agriculture and Food Security
DOI Number: https://doi.org/10.1002/ame2.12051
Publisher: John Wiley & Sons, Inc.
Keywords: Bone growth model, Chondrocytes, Endochondral ossification, Growth plate, Sprague-Dawleyra rat
Depositing User: Ms. Nur Faseha Mohd Kadim
Date Deposited: 15 Dec 2022 04:29
Last Modified: 15 Dec 2022 04:29
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1002/ame2.12051
URI: http://psasir.upm.edu.my/id/eprint/81761
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