Enhanced Expression of Cell Adhesion Molecules in the Aorta of Diabetic Mice is Mediated by gp91phox-derived Superoxide.
- Author:
Mi Ran YUN
1
;
Jong Jae KIM
;
Sun Mi LEE
;
Hye Jin HEO
;
Sun Sik BAE
;
Chi Dae KIM
Author Information
1. Department of Pharmacology, College of Medicine, Research Institute of Genetic Engineering, Pusan National University, Busan 602-739, Korea. chidkim@pusan.ac.kr
- Publication Type:Original Article
- Keywords:
Diabetes;
ICAM-1;
VCAM-1;
E-selectin;
NAD (P) H oxidase
- MeSH:
Animals;
Aorta*;
Atherosclerosis;
Cell Adhesion Molecules*;
Cell Adhesion*;
E-Selectin;
Intercellular Adhesion Molecule-1;
Membranes;
Mice*;
NAD;
Oxidoreductases;
P-Selectin;
Superoxides*;
Vascular Cell Adhesion Molecule-1
- From:The Korean Journal of Physiology and Pharmacology
2005;9(2):109-115
- CountryRepublic of Korea
- Language:English
-
Abstract:
Endothelial activation and subsequent recruitment of inflammatory cells are important steps in atherogenesis. The increased levels of cell adhesion molecules (CAM) have been identified in diabetic vasculatures, but the underlying mechanisms remain unclear. To determine the relationship among vascular production of superoxide, expression of CAM and diabetes, superoxide generation and expression of intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule-1 (VCAM-1), E- and P-selectin in the aorta from control (C57BL/6J) and diabetic mice (ob/ob) were measured. In situ staining for superoxide using dihydroethidium showed an increased superoxide production in diabetic aorta, accompanied with an enhanced NAD (P) H oxidase activity. Immunohistochemical analysis revealed that the endothelial expression of ICAM-1 (3.5+/-0.4) and VCAM-1 (3.8+/-0.3) in diabetic aorta was significantly higher than those in control aorta (0.9+/-0.5 and 1.6+/-0.3, respectively), accompanied with the enhanced expression of gp91phox, a membrane subunit of NAD (P) H oixdase. Furthermore, there was a strong positive correlation (r=0.89, P< 0.01 in ICAM-1 and r=0.88, P< 0.01 in VCAM-1) between ICAM-1/VCAM-1 expression and vascular production of superoxide. The present data indicate that the increased production of superoxide via NAD (P) H oxidase may explain the enhanced expression of CAM in diabetic vasculatures.
