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Journal of Biomedicine and Biotechnology
Volume 2010, Article ID 543514, 8 pages
http://dx.doi.org/10.1155/2010/543514
Research Article

The Relationship between Birthweight and Longitudinal Changes of Blood Pressure Is Modulated by Beta-Adrenergic Receptor Genes: The Bogalusa Heart Study

1Center for Cardiovascular Health, Department of Epidemiology, Tulane University Health Sciences Center, New Orleans, LA 70112, USA
2Human Genetics Center, University of Texas-Houston Health Science Center, Houston, TX 77030, USA

Received 16 July 2009; Revised 21 December 2009; Accepted 25 February 2010

Academic Editor: Wenjiang J. Fu

Copyright © 2010 Wei Chen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study examines the genetic influence of -adrenergic receptor gene polymorphisms ( -AR Arg16Gly and -AR Trp64Arg) on the relationship of birthweight to longitudinal changes of blood pressure (BP) from childhood to adulthood in 224 black and 515 white adults, aged 21–47 years, enrolled in the Bogalusa Heart Study. Blacks showed significantly lower birthweight and frequencies of -AR Gly16 and -AR Trp64 alleles and higher BP levels and age-related trends than whites. In multivariable regression analyses using race-adjusted BP and birthweight, low birthweight was associated with greater increase in age-related trend of systolic BP (standardized regression coefficient , ) and diastolic BP ( , ) in the combined sample of blacks and whites, adjusting for the first BP measurement in childhood, sex, age, and gestational age. Adjustment for the current body mass index strengthened the birthweight-BP association. Importantly, the strength of the association, measured as regression coefficients, was modulated by the combination of -AR and -AR genotypes for systolic ( for interaction) and diastolic BP age-related trend ( for interaction), with blacks and whites showing a similar trend in the interaction. These findings indicate that the intrauterine programming of BP regulation later in life depends on -AR genotypes.