Insulin-like growth factors and their binding proteins in children born small for gestational age: implication for...

Area of Science:

• Endocrinology
• Pediatric Growth Disorders
• Metabolic Regulation

Background:

• Insulin-like growth factors (IGFs) and binding proteins (IGFBPs) regulate growth and metabolism, mediating growth hormone (GH) actions.
• Children born small for gestational age (SGA) face risks of poor growth, metabolic abnormalities, and learning disabilities, potentially linked to IGFs.

Purpose of the Study:

• To explore the role of IGFs and related molecules in the medical problems of children born SGA.
• To evaluate the effectiveness and monitoring strategies for GH treatment in SGA children with growth failure.

Main Methods:

• Review of existing literature on IGFs, IGFBPs, and GH in SGA.
• Analysis of phenotypes in mouse models of IGF deficiency and human IGF-I mutations.
• Examination of growth factor levels and GH treatment outcomes in SGA children.

Main Results:

• Mouse models and human mutations of IGF-I/II show SGA-like phenotypes (slow growth, insulin resistance, mental dysfunction).
• SGA children often have normal IGF levels but lower IGFBP-3 relative to IGF-I, suggesting partial GH insensitivity.
• GH treatment improves growth in SGA children, though higher doses may be needed.

Conclusions:

• IGFs and IGFBPs are implicated in the pathophysiology of SGA-related issues.
• GH therapy is beneficial for SGA growth failure, but requires careful IGF level monitoring to optimize outcomes and address potential GH insensitivity.