The IGF system in a case of Costello syndrome
| Autor: | L Cresta, Renata Lorini, C. Schiaffino, Antonella Barreca, Mario Cotellessa, Mara Boschetti, Alessandro Giannattasio |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
medicine.medical_specialty
Fasting Hypoglycemia Endocrinology Diabetes and Metabolism Hyperpigmented skin Hypoglycemia Short stature Asymptomatic Craniofacial Abnormalities Endocrinology Costello syndrome Hyperpigmentation Insulin-Like Growth Factor II Keratoderma Palmoplantar Somatomedins Internal medicine Intellectual Disability medicine Humans Binary complex Insulin-Like Growth Factor I Ternary complex Growth Disorders Glycoproteins business.industry Infant Syndrome medicine.disease Insulin-Like Growth Factor Binding Protein 2 Insulin-Like Growth Factor Binding Protein 3 Female medicine.symptom business Carrier Proteins Insulin-Like Growth Factor Binding Protein 6 |
| Popis: | Costello syndrome is characterized by facial dysmorphia, hyperpigmented skin, palmar and plantar hyperkeratosis, curly hair, perioral and nasal papillomata (more rarely localized anally and on vocal cords), short stature, mental retardation and sociable personality. Although growth retardation is typical of Costello syndrome, its cause is not defined. We report on a 10-yr-old Caucasian girl affected by Costello syndrome with fasting hypoglycemia and short stature, associated low circulating levels of acid-labile subunit (ALS), relatively low levels of IGF-I and IGFBP-3, and normal IGF-II, mostly circulating in a binary complex with IGFBP-2 and -6 instead of in a 150 kDa ternary complex. The reduced ALS concentration and the consequent impaired formation of the circulating 150 kDa ternary complex can induce an accelerated clearance rate of IGF peptides and of IGFBP-3, contributing to the decreased IGF-I growth promoting activity in our patient. Moreover, the presence of IGF-II in the binary complex, which has been postulated to increase the insulin-like effects of these peptides, can explain, at least in part, the patient's asymptomatic fasting hypoglycemia. |
| Databáze: | OpenAIRE |
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