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Vascul Pharmacol. 2006 May;44(5):377-83. Epub 2006 Mar 3.

The TNF-alpha G-308A polymorphism is associated with C-reactive protein levels: the HERITAGE Family Study.

Author information

1
Pennington Biomedical Research Center, Louisiana State University, 6400 Perkins Road, Baton Rouge, Louisiana 70808-4124, USA. LakkaH@pbrc.edu

Abstract

OBJECTIVE:

Pro-inflammatory cytokines, such as tumor necrosis factor alpha (TNF-alpha), stimulate the release of C-reactive protein (CRP). We investigated the association between the TNF-alpha G-308A polymorphism and plasma CRP levels.

METHODS:

Subjects were 456 White (225 men, 231 women) and 232 Black (83 men, 149 women) healthy adults who underwent a 20-week standardized exercise program in the HERITAGE Family Study. The TNF-alpha gene promoter polymorphism was determined using PCR amplification followed by NcoI digestion. Plasma CRP was measured using a high-sensitivity assay.

RESULTS:

Genotype frequencies were in Hardy-Weinberg equilibrium. After adjustment for age, smoking, alcohol consumption, maximal oxygen uptake and, in women, hormone use, the AA homozygotes for the G-308A polymorphism had higher baseline CRP levels than other genotypes in White and Black men (P<0.001 and P = 0.044, respectively) and in Black women (P = 0.032). Body mass index partly explained these associations in Blacks. The exercise program results provided further evidence for an association with the polymorphism. Among those with high CRP at baseline (> or = 3.0 mg/L), regular exercise decreased CRP less in AA homozygotes than in other genotypes (P = 0.043).

CONCLUSION:

The AA genotype of the TNF-alpha G-308A polymorphism is associated with higher plasma CRP levels and less favorable CRP response to regular exercise.

PMID:
16581306
DOI:
10.1016/j.vph.2006.02.002
[Indexed for MEDLINE]

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