Increased aortic stiffness and attenuated lysyl oxidase activity in obesity.
Arterioscler Thromb Vasc Biol
; 33(4): 839-46, 2013 Apr.
Article
em En
| MEDLINE
| ID: mdl-23413430
ABSTRACT
OBJECTIVE:
One potential mechanism through which obesity exerts adverse effects on the vascular system is by increasing aortic stiffness, a change known to be predictive of increased cardiovascular mortality. The aim of this study was to investigate the pathophysiology that links obesity to aortic stiffening. APPROACH ANDRESULTS:
Obese (ob/ob) mice were used to examine physical, morphological, and molecular changes in the aorta in response to obesity. ob/ob mice had increased aortic pulse wave velocity and tissue rigidity. ob/ob aorta exhibited decreases of lysyl oxidase (LOX) activity and cross-linked elastin, and increases of elastin fragmentation and elastolytic activity. The aortas of ob/ob mice were surrounded by a significant amount of proinflammatory and pro-oxidative perivascular adipose tissue. In vitro studies revealed that the conditioned medium from differentiated adipocytes or the perivascular adipose tissue of ob/ob mice attenuated LOX activity. Furthermore, inhibition of LOX in wild-type lean mice caused elastin fragmentation and induced a significant increase in pulse wave velocity. Finally, we found that obese humans had stiffer arteries and lower serum LOX levels than do normal-weight humans.CONCLUSIONS:
Our results demonstrated that obesity resulted in aortic stiffening in both humans and mice, and established a causal relationship between LOX downregulation and aortic stiffening in obesity.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Aorta Abdominal
/
Rigidez Vascular
/
Proteína-Lisina 6-Oxidase
/
Obesidade
Tipo de estudo:
Observational_studies
/
Prognostic_studies
/
Risk_factors_studies
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article