Histology and proliferative capability of thoracic vertebral body growth plates of rats at different ages / 南方医科大学学报
Journal of Southern Medical University
;
(12): 353-356, 2011.
Artículo
en Chino
| WPRIM
| ID: wpr-307933
ABSTRACT
<p><b>OBJECTIVE</b>To compare the histological features of the thoracic vertebral body growth plates (VBGPs) of rats at different ages and assess their proliferative capability.</p><p><b>METHODS</b>The thoracic VBGPs obtained from rats aged 1 day and 1, 4, 8, 16 and 28 weeks were identified using safranin O-fast green staining, and the height of the hypertrophic zone, proliferative zone, and resting zone were measured. The chondrocytes were isolated from these VBGPs with a modified trypsin-collagenase type II digestion method for primary culture in vitro. The expressions of proliferating cell nuclear antigen (PCNA) mRNA and protein was detected by real time-PCR and Western blotting, respectively.</p><p><b>RESULTS</b>The 1-day- and 1-week-old rats showed significantly greater hypertrophic zone and proliferative zone in the VBGPs than older rats (P<0.01); the proliferative zone was significantly greater in rats aged 4 weeks than in those aged 28 weeks (P<0.05). The resting zone was obviously greater in rats aged 1 day and 1 week than in older rats (P<0.05), and also greater in rats aged 4 weeks than in those aged 16 and 28 weeks (P<0.05). Obvious ossification in the resting zone occurred at 16 weeks, and most of the resting zone became ossified at 28 weeks. The expression of PCNA decreased at both the mRNA and protein levels as the rats grew.</p><p><b>CONCLUSION</b>The 3 zones of VBGPs are greater in rats aged 1 day and 1 week than in older ones. Ossification in the resting zone begins at 16 weeks, and till 28 weeks, most of the resting zone is ossified. The proliferation ability of VBGP chondrocytes decreases with the increase of age of the rats.</p>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Vértebras Torácicas
/
ARN Mensajero
/
Células Cultivadas
/
Factores de Edad
/
Ratas Sprague-Dawley
/
Antígeno Nuclear de Célula en Proliferación
/
Condrocitos
/
Biología Celular
/
Proliferación Celular
/
Placa de Crecimiento
Tipo de estudio:
Estudio pronóstico
Límite:
Animales
Idioma:
Chino
Revista:
Journal of Southern Medical University
Año:
2011
Tipo del documento:
Artículo
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