title: IGF-1, IGFBP-3, and nutritional factors in young black and white men: the CARDIA Male Hormone Study.
abstract: Nutritional factors might play a role in regulating serum levels of insulin-like growth factors (IGFs), which are associated with some cancers. We examined the associations of nutritional factors with IGF-1 and IGF binding protein-3 (IGFBP-3). Serum IGF-1 and IGFBP-3 levels and dietary intake were measured in 459 black and 682 white male subjects of the Coronary Artery Risk Development in Young Adults study at the Year 7 (1992-1993) exam. Analysis of covariance and multivariable linear regression were used to assess associations of IGFs with dietary factors by race. IGF-1 was positively associated with magnesium in both black and white men (P = 0.008 and 0.05, respectively). Calcium was positively significantly related to IGF-1 in black men (P = 0.04) and marginally so in white men (P = 0.09). In black men, IGFBP-3 was positively associated with magnesium (P = 0.02), and one serving of milk per day was associated with an 8.23-ng/ml higher IGF-1 concentration (P = 0.05). Tests for interaction, however, revealed no differences between blacks and whites in the associations of nutrients with IGF-1 or IGFBP-3. In conclusion, the associations of dietary factors with serum IGF-1 and IGFBP-3 observed in our study corroborate those from other studies and generally do not differ between black and white men.
authors.affiliation: Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA.
authors.forename: Laura A
authors.initials: LA
authors.lastname: Colangelo
authors.forename: Brian C-H
authors.initials: BC
authors.lastname: Chiu
authors.forename: Kiang
authors.initials: K
authors.lastname: Liu
authors.forename: Peter A
authors.initials: PA
authors.lastname: Kopp
authors.forename: Peter H
authors.initials: PH
authors.lastname: Gann
authors.forename: Susan M
authors.initials: SM
authors.lastname: Gapstur
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D044383:Black People; D002118:Calcium / Q000097:blood; D015331:Cohort Studies; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000032:analysis*; D016014:Linear Models; D008137:Longitudinal Studies; D008274:Magnesium / Q000097:blood; D008297:Male; D044465:White People
chemical_list: D018972:Insulin-Like Growth Factor Binding Protein 3; D007334:Insulin-Like Growth Factor I; D008274:Magnesium; D002118:Calcium