RESUMO
CONTEXT: Pappalysins (PAPP-A, PAPP-A2) modulate body growth by increasing insulin-like growth factor I (IGF-I) bioavailability through cleavage of insulin-like growth factor binding proteins (IGFBPs) and are inhibited by stanniocalcins (STC1, STC2). Normative data on these novel factors, as well as on free IGF-I and uncleaved fractions of IGFBPs, are not well established. OBJECTIVE: This work aimed to determine serum concentrations of PAPP-A, PAPP-A2, STC1, and STC2 in relationship with other growth hormone (GH)-IGF axis parameters during development. METHODS: Full-term newborns (150; gestational age: 39.30â ±â 1.10 weeks), 40 preterm newborns (30.87â ±â 3.35 weeks), and 1071 healthy individuals (aged 1-30 years) were included in the study and divided according to their Tanner stages (males and females): I:163 males, 154 females; II:100 males, 75 females; III:83 males, 96 females; IV: 77 males, 86 females; and V:109 males,128 females. RESULTS: Serum concentrations of PAPP-A, PAPP-A2, STC1, STC2, IGFBP-2, total IGFBP-4, and total IGFBP-5 were elevated at birth and declined throughout childhood. In postnatal life, PAPP-A2 concentrations decreased progressively in concomitance with the free/total IGF-I ratio; however, stanniocalcin concentrations remained stable. PAPP-A2 concentrations positively correlated with the free/total IGF-I ratio (râ =â +0.28; Pâ <â .001) and negatively with the intact/total IGFBP-3 ratio (râ =â -0.23; Pâ <â .001). PAPP-A concentrations inversely correlated with intact/total IGFBP-4 ratio (râ =â -0.21; Pâ <â .001), with PAPP-A concentrations being lower in females at all ages. Association studies indicate the importance of stanniocalcins and pappalysins in the control of this axis in an age-specific manner. CONCLUSION: This study provides reference values of pappalysins and stanniocalcins, which modulate IGF-I activity by changing the concentrations of cleaved and uncleaved IGFBPs.
Assuntos
Proteína 4 de Ligação a Fator de Crescimento Semelhante à Insulina , Fator de Crescimento Insulin-Like I , Criança , Feminino , Glicoproteínas , Hormônio do Crescimento/metabolismo , Humanos , Lactente , Recém-Nascido , Proteína 2 de Ligação a Fator de Crescimento Semelhante à Insulina , Proteína 3 de Ligação a Fator de Crescimento Semelhante à Insulina , Proteína 4 de Ligação a Fator de Crescimento Semelhante à Insulina/metabolismo , Proteína 5 de Ligação a Fator de Crescimento Semelhante à Insulina , Proteínas de Ligação a Fator de Crescimento Semelhante a Insulina , Fator de Crescimento Insulin-Like I/metabolismo , Masculino , Proteína Plasmática A Associada à Gravidez/metabolismoRESUMO
La urticaria multiforme es un trastorno cutáneo, propio de lactantes y niños pequeños, caracterizado por lesiones habonosas de centro violáceo y morfología anular. Presenta similitud con el eritema multiforme, pero a diferencia de este, tiene un carácter benigno y autolimitado. Su etiología es desconocida y el tratamiento, sintomático. Su conocimiento y diagnóstico diferencial es importante para evitar pruebas diagnósticas innecesarias, realizar un manejo correcto y proporcionar información adecuada a los padres
Urticaria multiforme is a cutaneous disorder, which mainly affects infants and young children. It seems like erythema multiforme, but it has a benign and self-limiting course. Its etiology is unknown and treatment, symptomatic. Their knowledge and differential diagnosis is important to avoid unnecessary diagnostic procedures, correct management and provide adequate information to parents
