Relation between serum Insulin-like growth factor-I and insulin-like growth factor-binding protein-3 levels, clinical status and growth parameters in prepubertal cystic fibrosis patients.
BACKGROUND
This study aims to determine the relation between anabolic hormones, Insulin-like growth factor-I (IGF-I) and IGF-binding protein-3 (IGFBP-3), growth parameters, and clinical status in prepubertal cystic fibrosis (CF) patients. This prospective study comprises age/sex-matched control subjects and was set in a tertiary care teaching hospital.


METHODS
Serum concentrations of IGF-I and IGFBP-3 were measured in 37 CF and 23 healthy subjects, whose mean ages were 5.02 +/- 3.06 and 5.27 +/- 2.82, respectively. The results were analyzed in relation to body mass index standard deviation scores (BMISD), height standard deviation scores (HSD), growth velocity standard deviation scores (GVSD), and clinical status assessed by Shwachman scores and pulmonary function parameters.


RESULTS
Serum IGFBP-3 of CF patients showed significantly lower concentrations than healthy subjects (2457 vs. 3249 ng/mL) (P < 0.05), whereas IGF-I levels did not (123.35 vs. 149.8 ng/mL). There was significant positive correlation between IGF-I and IGFBP-3 with HSD (r = 0.62; r = 0.79) and BMISD (r = 0.39; r = 0.50). The pulmonary function tests in 14 CF subjects were not statistically worse than in nine healthy cases. The mean HSD (-0.67, SD 1.06) and BMISD (-0.28, SD 0.71) of CF patients were not significantly lower than those of healthy subjects (-0.02, SD 0.86 and 0.03, SD 0.49), respectively.


CONCLUSIONS
Decreased serum IGF-I and IGFBP-3 levels may reflect growth retardation in CF. IGFBP-3 seems like a more sensitive parameter than IGF-I for growth monitoring in this study. Growth parameters of Turkish prepubertal CF patients are not markedly below national standards. Different genetic backgrounds of relevant populations certainly play an important role for the variable clinical course.
Department of Pediatrics, Inonu University Medical Faculty, Malatya, Turkey. metehan@superposta.com
Metehan
M
Ozen
Haluk
H
Cokugras
Naile
N
Ozen
Yildiz
Y
Camcioglu
Necla
N
Akcakaya
D001827:Body Height; D015992:Body Mass Index; D001835:Body Weight; D016022:Case-Control Studies; D002648:Child; D002675:Child, Preschool; D003550:Cystic Fibrosis / Q000097:blood* / Q000473:pathology / Q000503:physiopathology; D005260:Female; D006801:Humans; D007223:Infant; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D008297:Male; D012129:Respiratory Function Tests
D018972:Insulin-Like Growth Factor Binding Protein 3; D007334:Insulin-Like Growth Factor I