| First Author | Syyong HT | Year | 2009 |
| Journal | Br J Pharmacol | Volume | 158 |
| Issue | 6 | Pages | 1597-608 |
| PubMed ID | 19814726 | Mgi Jnum | J:299060 |
| Mgi Id | MGI:6490111 | Doi | 10.1111/j.1476-5381.2009.00439.x |
| Citation | Syyong HT, et al. (2009) Dysfunction of endothelial and smooth muscle cells in small arteries of a mouse model of Marfan syndrome. Br J Pharmacol 158(6):1597-608 |
| abstractText | BACKGROUND AND PURPOSE: Marfan syndrome, a connective tissue disorder caused by mutations in FBN1 encoding fibrillin-1, results in life-threatening complications in the aorta, but little is known about its effects in resistance vasculature. EXPERIMENTAL APPROACH: Second-order mesenteric arteries from mice at 3, 6 and 10 months of age (n= 30) heterozygous for the Fbn1 allele encoding a cysteine substitution (Fbn1(C1039G/+)) were compared with those from age-matched control littermates. KEY RESULTS: Stress-strain curves indicated that arterial stiffness was increased at 6 and 10 months of age in Marfan vessels. Isometric force measurement revealed that contraction in response to potassium (60 mM)-induced membrane depolarization was decreased by at least 28% in Marfan vessels at all ages, while phenylephrine (3 microM)-induced contraction was reduced by at least 40% from 6 months. Acetylcholine-induced relaxation in Marfan vessels was reduced to 70% and 45% of control values, respectively, at 6 and 10 months. Sensitivity to sodium nitroprusside was reduced at 6 months (pEC(50)= 5.64 +/- 0.11, control pEC(50)= 7.34 +/- 0.04) and 10 months (pEC(50)= 5.99 +/- 0.07, control pEC(50)= 6.99 +/- 0.14). Pretreatment with N(omega)-Nitro-L-arginine methyl ester (200 microM) had no effect on acetylcholine-induced relaxation in Marfan vessels, but reduced vasorelaxation in control vessels to 57% of control values. Addition of indomethacin (10 microM) and catalase (1000 U.mL(-1)) further inhibited vasorelaxation in Marfan vessels to a greater degree compared with control vessels. CONCLUSIONS AND IMPLICATIONS: Pathogenesis of Marfan syndrome in resistance-sized arteries increases stiffness and impairs vasomotor function. |
