Abstract
OBJECTIVE:
To ascertain the extent to which relationships between obesity (OB) and blood pressure (BP) can be explained by an individual's leptin plasma levels.
DESIGN:
Pedigree-based cross-sectional study in an apparently healthy population of European origin.
SUBJECTS:
The study sample is comprised of 90 nuclear and more complex families totaling 210 male and 213 female subjects aged 18–75 y, randomly recruited in Bashkorstan Autonomic region, Russia.
MEASUREMENTS:
Various fatness and fat distribution traits (including nine circumferences (CRCs), and eight skinfolds (CKFs) by anthropometry), blood pressure, and plasma leptin levels (by ELISA kits).
RESULTS:
Adjustment for circulating leptin led to attenuation of the magnitude of correlations between OB and BP, regardless of trait pair and sex cohort. Some of these correlations became statistically nonsignificant. All familial effects were gone, and heritability estimates became virtually zero after adjustment of each of the OB traits and systolic blood pressure (SBP) in offspring for leptin values in parents.
CONCLUSION:
BP and OB covariation is substantially mediated by circulating leptin levels. As a result, body fat has only a weak independent effect on BP variation after adjustment for leptin levels. Our findings also strongly suggest that genetic variation in body mass index, SKFs, and even body CRCs, as well as of SBP is due to genetic variation of leptin. Genetic variation of diastolic blood pressure in the present sample, however, shared very little with that of leptin.
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Acknowledgements
This study was supported jointly by the Israel National Science Foundation to GL (Grant # 544/00-1) and by a Postdoctoral Fellowship Grant (PI) kindly provided by UNESCO and Israel (the Ministry of Education, the Council for Higher Education's Planning and Budgeting Committee, the Ministry of Foreign Affairs and the Israel National Commission for UNESCO).
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Livshits, G., Pantsulaia, I. & Gerber, L. Association of leptin levels with obesity and blood pressure: possible common genetic variation. Int J Obes 29, 85–92 (2005). https://doi.org/10.1038/sj.ijo.0802826
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DOI: https://doi.org/10.1038/sj.ijo.0802826
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