A high-fat meal impairs muscle vasodilatation response to mental stress in humans with Glu27 beta(2)-adrenoceptor polymorphism

Author(s)

Gowdak, Marcia M. G. ^[1] ; Laterza, Mateus C. ^[1] ; Rondon, Maria Urbana P. B. ^[1] ; Trombetta, Ivani C. ^[1] ; Pereira, Alexandre C. ^[1] ; Krieger, Jose Eduardo ; Negrao, Carlos Eduardo ^{[2, 1]}

Affiliation

^[1] Univ Sao Paulo, Sch Med, Heart Inst InCor, Unit Cardiovasc Rehabil & Exercise Physiol, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Sch Phys Educ & Sports, Sao Paulo - Brazil

• Document type: Journal article
• Source: LIPIDS IN HEALTH AND DISEASE; v. 9, JUN 2 2010.
• Web of Science Citations: 2

Abstract

Background: Forearm blood flow responses during mental stress are greater in individuals homozygous for the Glu27 allele. A high-fat meal is associated with impaired endothelium-dependent dilatation. We investigated the impact of high-fat ingestion on the muscle vasodilatory responses during mental stress in individuals with the Glu27 allele and those with the Gln27 allele of the beta(2)-adrenoceptor gene. Methods: A total of 162 preselected individuals were genotyped for the Glu27Gln beta(2)-adrenoceptor polymorphism. Twenty-four individuals participated in the study. Fourteen were homozygous for the Gln27 allele (Gln27Gln, 40 +/- 2 years; 64 +/- 2 kg), and 10 were homozygous for the Glu27 allele (Glu27Glu, 40 +/- 3 years; 65 +/- 3 kg). Forearm blood flow was evaluated by venous occlusion plethysmography before and after ingestion of 62 g of fat. Results: The high-fat meal caused no changes in baseline forearm vascular conductance (FVC, 2.2 +/- 0.1 vs. 2.4 +/- 0.2; P = 0.27, respectively), but reduced FVC responses to mental stress (1.5 +/- 0.2 vs. 0.8 +/- 0.2 units; P = 0.04). When volunteers were divided according to their genotypes, baseline FVC was not different between groups (Glu27Glu = 2.4 +/- 0.1 vs. Gln27Gln = 2.1 +/- 0.1 units; P = 0.08), but it was significantly greater in Glu27Glu individuals during mental stress (1.9 +/- 0.4 vs. 1.0 +/- 0.3 units; P = 0.04). High-fat intake eliminated the difference in FVC responses between Glu27Glu and Gln27Gln individuals (FVC, 1.3 +/- 0.4 vs. 1.2 +/- 0.4; P = 0.66, respectively). Conclusion: These findings demonstrate that a high-fat meal impairs muscle vasodilatation responses to mental stress in humans. However, this reduction can be attributed to the presence of the homozygous Glu27 allele of the beta(2)-adrenoceptor gene. (AU)

• FAPESP's process: 05/59740-7 - Physical exercise and autonomic control in cardiovascular physiopathology
• Grantee: Carlos Eduardo Negrão
• Support Opportunities: Research Projects - Thematic Grants