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. 1992 Apr;89(4):1128–1132. doi: 10.1172/JCI115693

Decreased serum insulin-like growth factor-I associated with growth failure in newborn lambs with experimental cyanotic heart disease.

D Bernstein 1, J R Jasper 1, R G Rosenfeld 1, R L Hintz 1
PMCID: PMC442969  PMID: 1372914

Abstract

To determine whether chronic hypoxemia results in alterations in endocrine function that may contribute to growth failure, we measured growth hormone (GH), somatomedins (insulin-like growth factors I and II, IGF-I and IGF-2), hepatic growth hormone receptors, and circulating IGF-binding proteins IGFBP-3 and IGFBP-2 in 12 newborn lambs with surgically created pulmonic stenosis and atrial septal defect, and in 10 controls. During chronic hypoxemia (oxygen saturation of 60-74% for 2 wk), weight gain was 60% of control (hypoxemic, 135 +/- 20 vs. control, 216 +/- 26 g/d, P less than 0.02). IGF-I was decreased by 43% (hypoxemic 253.6 +/- 29.3 SE vs. control 448.0 +/- 75.5 ng/ml, P = 0.01), whereas GH was unchanged (19.9 +/- 5.1 vs. 11.9 +/- 3.0 ng/ml, NS). The increase in IGF-1 was associated with a decrease in IGFBP-3 (hypoxemic, 5.09 +/- 1.25 vs. control, 11.2 +/- 1.08 arbitrary absorbency units per mm (Au.mm), P less than 0.01), and increase in IGFBP-2 (0.47 +/- 0.03 vs. 0.19 +/- 0.13 Au.mm, P less than 0.05), but no significant downregulation of hepatic GH receptors (hypoxemic, 106.1 +/- 20.1 vs. control, 147.3 +/- 25.9 fmol/mg, NS). Thus, chronic hypoxemia in the newborn is associated with a decrease in IGF-I and IGFBP-3 in the face of normal GH. This suggests peripheral GH unresponsiveness, similar to protein-calorie malnutrition or GH receptor deficiency dwarfism, but mediated at a level distal to the hepatic GH receptor.

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Selected References

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