Abstract
Objective:
Childhood obesity is a growing global epidemic. Recent studies indicate that obesity and related metabolic traits are highly heritable. Increasing evidence suggests that growth hormone (GH) and the insulin-like growth factor-I (IGF-I) axis have important functions in regulating adiposity and insulin sensitivity. Five single-nucleotide polymorphisms (SNPs) at IGF-binding protein-3 (IGFBP3) were genotyped to find their associations with IGF-1 activity level and common clinical metabolic traits.
Patients and Methods:
We examined the associations of five SNPs at IGFBP3 with serum IGF-I and IGFBP-3 levels, as well as with obesity-related metabolic traits in 981 Hong Kong Chinese adolescents. Factor analysis was used to reduce the intercorrelated variables to five factor scores indicating body composition, blood pressure, IGF-I activity, triglyceride (TG)+high-density lipoprotein cholesterol (HDL-C) and total cholesterol (TC)+low-density lipoprotein cholesterol (LDL-C) factor scores.
Results:
There was a strong association between the −202A/C polymorphism (rs2854744) and IGF-I activity (P=1.2 × 10−6) and TC+LDL-C factor scores (P=0.0085), corrected for age and sex. The C allele was associated with decreased IGFBP-3 levels (P=1.21 × 10−13), increased IGF-I/IGFBP-3 molar ratio (P=5.22 × 10−6) and decreased LDL-C (P=0.020). There was also a significant association between a G/A polymorphism at the 3′ flanking sequence (rs13223993) of the IGFBP3 gene and the TG+HDL-C factor score (P=0.0013). The minor A allele carriers of rs13223993 had a lower HDL-C (P=0.0067) level and a tendency toward a high TG level. Haplotype analysis did not increase the significance of associations between single SNPs and phenotypes.
Conclusion:
Our results support the function of IGFBP3 gene polymorphisms in modulating IGF-I activity and lipid levels in adolescents. Given the prognostic significance of IGF-I, IGFBPs and lipids on risk of diabetes, obesity and cancer, long-term studies are required to clarify the clinical meaning of these findings.
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Acknowledgements
This study was supported by the Croucher Foundation and the Research Grants Council of the Hong Kong Special Administrative Region, China (CUHK 4055/01M).
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Mong, J., Ng, M., Guldan, G. et al. Associations of insulin-like growth factor binding protein-3 gene polymorphisms with IGF-I activity and lipid parameters in adolescents. Int J Obes 33, 1446–1453 (2009). https://doi.org/10.1038/ijo.2009.186
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DOI: https://doi.org/10.1038/ijo.2009.186
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