Abstract :
[en] OBJECTIVE: To evaluate the effect of a second-stage piezocision on the biological response.
MATERIALS AND METHODS: 60 rats were randomly allocated to 6 experimental groups of 10 rats. Rats undergoing a one-stage piezocision were sacrified on day 7, 28 and 42 (groups 1-3) while rats undergoing a two-satge piezocision were sacrified on day 42, 63 and 90 (groups 4-6), respectively. The biological response was investigated in 3D at the tissue level using Nano-computed tomography (Nano-CT) and, at the molecular level using the qRT-PCR technique. Bone Volume Fraction (BVF) loss was the primary endpoint.
RESULTS: Similar loss of BVF were observed both after the first and second piezocisions. The change in BVF loss between 7 and 28 days after each piezocision were 25.1 ± 13.0 (SE)% and 11.2 ± 11.6 (SE)% respectively and did not differ from each other (p = 0.43). Changes in BVF loss from 7 to 42 days were also comparable in one-stage and two-stage piezocision (4.9 ± 12.3 (SE) vs. -19.9 ± 13.4 (SE), p = 0.19). At the molecular level, all parameters except Translating Ribosome Affinity Purification (TRAP) protein had identical patterns.
CONCLUSION: Within the limits of the present study, a second piezocision allowed to re-induce the Regional Acceleratory Phenomenon (RAP) effect. Nevertheless, the relevance of the findings to the clinical effect has not been tested.
Funding text :
The Nano-CT images were generated on the X-ray computed tomography facility of the Department of Development and Regeneration of the KU Leuven (Mrs. Carla Geeroms), financed by the Hercules Foundation (project AKUL/13/47: Nano-CT and Bioreactor-CT for a better understanding of the dynamics of 3D tissue formation in regenerative medicine: from clustered cells towards organized multi-tissue system and whole organs). Furthermore, we are grateful to the members of the Animal Facilities of ULi?ge (Prof. Pierre-Vincent Drion and Mr. Luc Duwez) and to the Immunohistology platform (Dr. Chantal Humblet) for technical and histological assistance. Finally, we thank the Cellular and Molecular Immunology Lab (Prof. Fabrice Bureau) for giving us access to technical material to perform the molecular analysis.
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