RESUMO
REASONS FOR PERFORMING STUDY: Structural changes in articular cartilage associated with the ageing process require definition for investigators performing developmental and age-related studies, for which information is lacking. OBJECTIVES: To 1) determine the onset and end of puberty as defined by serum insulin like growth factor (IGF-I) and IGF-binding protein-3 (IGFBP-3) concentrations and 2) correlate articular-epiphyseal cartilage complex structural changes with the onset and end of puberty. METHODS: IGF-I and IGFBP-3 were measured in serum samples from normal female and male horses age 9-715 days to determine peak and steady-state values for horses transitioning through puberty. Osteochondral tissue sections were obtained from horses age 120-840 days (4-28 months) and examined histologically for cartilage canals and tidemark formation. RESULTS: In male and female horses, serum IGF-I/IGFBP-3 concentrations peaked at approximately 225 days, defining the onset of puberty. Cartilage canals were absent from articular cartilage just prior to this time point. IGF-I/IGFBP-3 concentrations declined to steady-state levels at approximately age 450 days, signalling exit from puberty and therefore the beginning of ageing. This time point correlated to initial formation of a tidemark in the osteochondral tissue sections. CONCLUSIONS: Horses may be considered pubescent at age 225-450 days, and post pubescent and ageing after age 450 days. POTENTIAL RELEVANCE: Defining the normal post natal to post pubescent concentrations for serum IGF-I and serum IGFBP-3 establishes subsets of animals for age-related studies and may be used to monitor horses for abnormally high IGF-I concentrations due to natural disease or subsequent to systemic growth hormone administration.
Assuntos
Envelhecimento/fisiologia , Cartilagem Articular/crescimento & desenvolvimento , Cavalos/fisiologia , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/metabolismo , Fator de Crescimento Insulin-Like I/metabolismo , Fatores Etários , Envelhecimento/sangue , Envelhecimento/metabolismo , Animais , Biomarcadores/sangue , Biomarcadores/metabolismo , Cartilagem Articular/patologia , Estudos Transversais , Feminino , Cavalos/sangue , Cavalos/metabolismo , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina/sangue , Masculino , Maturidade Sexual/fisiologiaRESUMO
Los casos de sindrome alcohol fetal (SAF) descriptos representan el 0,36% de ingresos de ninos en grave riesgo psicosocial registrados entre 1979 y 1982.Se presentan sus caracteristicas clinicas, el examen cromosomico y evolucion. El alcoholismo materno es causal de abandono condicionando carencias nutricionales y afectivas posteriores al nacimiento.Se considera una patologia completamente prevenible
Assuntos
Lactente , Humanos , Transtornos do Espectro Alcoólico FetalRESUMO
Los casos de sindrome alcohol fetal (SAF) descriptos representan el 0,36% de ingresos de ninos en grave riesgo psicosocial registrados entre 1979 y 1982.Se presentan sus caracteristicas clinicas, el examen cromosomico y evolucion. El alcoholismo materno es causal de abandono condicionando carencias nutricionales y afectivas posteriores al nacimiento.Se considera una patologia completamente prevenible
