Leptin may enhance hepatic insulin sensitivity in children and women born small for gestational age
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Published on: September 9, 2025
Anna Kistner1, Mireille Vanpée, Kerstin Hall
1Department of Molecular Medicine and Surgery Karolinska Institutet SE-171 76, Stockholm Sweden.
Insights
Small for gestational age (SGA) girls and women exhibit elevated leptin levels, potentially offering protection against insulin resistance. Insulin and leptin influence insulin-binding protein 1 (IGFBP1) levels in children born SGA.
Area of Science:
- Endocrinology
- Pediatrics
- Metabolic Health
Background:
- Children born small for gestational age (SGA) face increased risks for type 2 diabetes.
- Leptin, a hormone, can reverse metabolic issues associated with early type 2 diabetes.
- Low insulin-binding protein 1 (IGFBP1) levels are predictive of type 2 diabetes development.
Purpose of the Study:
- To investigate leptin, insulin, and IGFBP1 levels in preterm and SGA children and adult women.
- To assess the role of leptin as a compensatory mechanism in the development of insulin resistance.
Main Methods:
- Studied 76 children (8.5-10 years) and 45 women (23-30 years).
- Participants included those born appropriate for gestational age, SGA at term, and preterm.
- Measured fasting levels of IGFBP1, leptin, insulin, IGF1, and total adiponectin (in women).
Main Results:
- Term SGA girls and women showed higher leptin levels relative to BMI SDS.
- Leptin and insulin explained over half of the IGFBP1 variability in children.
- Term SGA women had lower IGFBP1 levels compared to controls.
Conclusions:
- Elevated leptin levels were observed in term SGA girls and women, particularly adults.
- IGFBP1 was lower in term SGA women, with leptin and insulin significantly impacting IGFBP1 in children.
- Higher leptin may serve a protective role in enhancing hepatic insulin sensitivity.
Objective:
Children born small for gestational age (SGA) are at risk for developing type 2 diabetes. Lipodystrophy leads to early type 2 diabetes and leptin reverses the metabolic consequences of the disease. Low IGF-binding protein 1 (IGFBP1) can predict the development of type 2 diabetes. The aim of this study was to determine leptin, insulin, and IGFBP1 in children and adult women born preterm or SGA to evaluate the role of leptin as a compensatory mechanism in insulin resistance development.
Methods:
Seventy-six children (8.5-10 years, 41 girls and 35 boys) and 45 women (23-30 years) were studied. The children comprised subjects born appropriate for gestational age (<30 gestational weeks) (n=22), born SGA at term (n=23), and full-term normal-weight controls (n=31). Among the women, the corresponding figures were, n=10, n=18, and n=17 respectively. Fasting levels of IGFBP1, leptin, insulin, and IGF1 were determined and total adiponectin only in women.
Results:
In girls and women, term SGA subjects had higher leptin levels in relation to BMI SDS (P=0.042 and P=0.03 respectively). More than half of IGFBP1 variability was explained by leptin and insulin in children. In term SGA women, IGFBP1 level was lower compared with controls (P=0.012) and the regression line of IGFBP1 on insulin was suppressed below -1 s.d. of a reference material.
Conclusion:
Leptin levels were elevated in term SGA girls and women, in particular in adult women, but not found in preterm girls and women. IGFBP1 was lower in term SGA women. In children, leptin and insulin were strong suppressors of IGFBP1. We speculate that higher leptin levels could be a protective event to enhance hepatic insulin sensitivity.
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