TY - JOUR
T1 - The IGF system in a case of Costello syndrome
AU - Barreca, A.
AU - Cotellessa, M.
AU - Boschetti, Mara
AU - Giannattasio, A.
AU - Cresta, L.
AU - Schiaffino, C.
AU - Lorini, R.
PY - 2006/3
Y1 - 2006/3
N2 - Costello syndrome is characterized by facial dysmorphia, hyperpigmented skin, palmar and plantarhyperkeratosis, 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.
AB - Costello syndrome is characterized by facial dysmorphia, hyperpigmented skin, palmar and plantarhyperkeratosis, 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.
KW - Costello syndrome
KW - GH
KW - Growth delay
KW - Hypoglycemia
KW - IGFBPs
KW - IGFs
UR - http://www.scopus.com/inward/record.url?scp=33646231261&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=33646231261&partnerID=8YFLogxK
M3 - Article
C2 - 16682842
AN - SCOPUS:33646231261
VL - 29
SP - 261
EP - 264
JO - Journal of Endocrinological Investigation
JF - Journal of Endocrinological Investigation
SN - 0391-4097
IS - 3
ER -