Increased enzyme activity and beta-adrenergic mediated vasodilation in subjects expressing a single-nucleotide variant of human adenylyl cyclase 6.
Article Details
- CitationCopy to clipboard
Gros R, Van Uum S, Hutchinson-Jaffe A, Ding Q, Pickering JG, Hegele RA, Feldman RD
Increased enzyme activity and beta-adrenergic mediated vasodilation in subjects expressing a single-nucleotide variant of human adenylyl cyclase 6.
Arterioscler Thromb Vasc Biol. 2007 Dec;27(12):2657-63. Epub 2007 Oct 4.
- PubMed ID
- 17916776 [ View in PubMed]
- Abstract
OBJECTIVE: cAMP is a critical regulator of metabolic and cardiovascular function. However, the role of genetic variability in the regulation of cAMP-mediated effects is unclear. Therefore, we assessed the effect of the expression of a recently identified missense genetic variant of adenylyl cyclase isoform 6 (ADCY6 S674). METHODS AND RESULTS: In rat vascular smooth muscle cells, gene transfer of ADCY6 S674 increased adenylyl cyclase activity and arborization to a greater extent than gene transfer of ADCY6 A674. Similarly, in adherent mononuclear leukocyte cells isolated from ADCY6 S674-expressing human subjects, both adenylyl cyclase activity and adenylyl cyclase-mediated cell retraction were significantly increased. Additionally, in dorsal hand vein LVDT studies, subjects expressing the hyper-functional ADCY6 S674 variant had significantly greater vascular sensitivity to the beta-adrenergic agonist isoproterenol as assessed by both a greater potency and greater maximal effect than subjects expressing the ADCY6 A674 enzyme. CONCLUSIONS: These data indicate that the expression of a novel, relatively common variant of ADCY6 parallels an increase in adenylyl cyclase activity and adenylyl cyclase-mediated function in humans.