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New Exercise and Fitness Review
Related Articles The utility of the IGF-I generation test in children with chronic kidney disease.Pediatr Nephrol. 2013 Dec;28(12):2323-33
Authors: Al-Uzri A, Swinford RD, Nguyen T, Jenkins R, Gunsul A, Kachan-Liu SS, Rosenfeld R
Abstract
BACKGROUND: To determine if the insulin-like-growth factor (IGF-I) generation test is a marker for growth hormone (GH) sensitivity in children with chronic kidney disease (CKD).
METHODS: This was a randomized cross-over study in which children with CKD received low-dose (0.025 mg/kg/day) and high-dose (0.05 mg/kg/day) GH therapy in the framework of a 7-day IGF-I generation test. Blood samples were collected on day 1 (D1; pre-dose) and on day 8 (D8; post 7 doses) of GH therapy. All subjects received GH for 12 months at 0.05 mg/kg/day. Serum IGF-I was measured by radioimmunometric assay. Normative historic data from healthy children and those with idiopathic short stature were used for comparison.
RESULTS: Sixteen subjects (age 2-13 years) with creatinine clearances of between 25 and 75 ml/min/1.73 m(2) were enrolled. Annualized height velocity for all subjects was 10.3 ± 1.1 cm/year (mean ± standard deviation), with an annual change in height Z score of 0.7 ± 1.0. No correlation was found between the generated serum IGF-I levels (D8 – D1) and creatinine clearances, and with changes in height Z scores. Serum IGF-I levels on D1 and D8 in CKD subjects were lower than normative data, but with adequate IGF-I generation on D8.
CONCLUSIONS: Children with CKD were able to respond to GH therapy with both growth and an increase in serum IGF-I levels, but the IGF-I generation test was not a good predictor of growth response in this cohort.
PMID: 24013497 [PubMed - indexed for MEDLINE]
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Insulin like growth factors
IGF-1
Igf-1r3
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