Abstract | OBJECTIVE: DESIGN: Based on clinical criteria, 32 patients with clinical characteristics of Sotos syndrome (median age 8.4 years, range 1.8-48.4) were categorised into three groups: typical (n = 10, group 1), dubious (n = 12, group 2) and atypical (n = 10, group 3). Blood samples were obtained from 29 patients. MEASUREMENTS: Plasma IGF-I, IGF-II, E-II ( pro-IGF-II and E-domain fragments), IGFBP-2, IGFBP-3, IGFBP-4, IGFBP-6 and ALS were measured by specific radioimmunoassays (RIAs). Except for E-II immunoreactivity, the concentrations were compared with those of age references, and expressed as standard deviation scores (SDS). IGFBP-3 proteolysis was assessed by incubation of serum with [125I]- IGFBP-3, followed by gel electrophoresis and was then compared with that in normal serum and third trimester pregnancy serum. RESULTS: Patients in group 1 showed significantly reduced plasma levels of IGF-II (median -0.9 SDS; p = 0.01), IGFBP-4 (-0.5 SDS; p = 0.02) and IGFBP-3 (-1.0 SDS; p = 0.01). Mean IGFBP-3 proteolysis was higher than in normal standard serum (61% vs 37%; p < 0.01) but lower than in third trimester pregnancy serum (94%; p < 0.01). Plasma IGF-I showed a tendency towards low values (median -0.9 SDS; p = 0.09), IGFBP-6 and ALS a tendency towards elevated levels (median values +0.8 SDS; p = 0.07 and +2.3 SDS; p = 0.09), and IGFBP-2 was normal. The mean value of E-II immunoreactivity was 8.7 nmol/l, similar to that in pooled normal plasma (8.6 nmol/l). Plasma and serum parameters in groups 2 and 3 were similar to reference values with the exception of plasma IGFBP-3 (in groups 2 and 3 median < or = -1.1 SDS; p < or = 0.02) and ALS (in group 3 median +1.3 SDS; p < 0.01). CONCLUSIONS:
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Authors | L de Boer, C M Hoogerbrugge, J van Doorn, S C van Buul-Offers, M Karperien, J M Wit |
Journal | Journal of pediatric endocrinology & metabolism : JPEM
(J Pediatr Endocrinol Metab)
Vol. 17
Issue 4
Pg. 615-27
(Apr 2004)
ISSN: 0334-018X [Print] Germany |
PMID | 15198293
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Carrier Proteins
- Glycoproteins
- Insulin-Like Growth Factor Binding Protein 3
- Insulin-Like Growth Factor Binding Proteins
- Somatomedins
- insulin-like growth factor binding protein, acid labile subunit
- Peptide Hydrolases
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Topics |
- Adolescent
- Adult
- Carrier Proteins
(blood)
- Child
- Child, Preschool
- Female
- Gigantism
(blood)
- Glycoproteins
(blood)
- Humans
- Infant
- Insulin-Like Growth Factor Binding Protein 3
(metabolism)
- Insulin-Like Growth Factor Binding Proteins
(blood)
- Male
- Middle Aged
- Peptide Hydrolases
(metabolism)
- Somatomedins
(metabolism)
- Syndrome
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