Integrins Mediating Adhesion and Proliferation of ADP-stimulated Vascular Smooth Muscle Cells.
10.4070/kcj.2003.33.5.409
- Author:
Seung Jae JOO
1
;
Tae Joon CHA
;
Jae Woo LEE
Author Information
1. Department of Medicine, Kosin University Gospel Hospital, Busan, Korea. sejjoo@ns.kosinmed.or.kr
- Publication Type:Original Article
- Keywords:
Integrins;
Adenosine diphosphate;
Muscle, smooth, vascular;
Adhesions
- MeSH:
Adenosine Diphosphate;
Humans;
Integrin alpha5beta1;
Integrin alphaVbeta3;
Integrin beta3;
Integrin-Binding Sialoprotein;
Integrins*;
Ligands;
Muscle, Smooth, Vascular*;
Myocytes, Smooth Muscle;
Negotiating*;
Prothrombin
- From:Korean Circulation Journal
2003;33(5):409-419
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
BACKGROUND AND OBJECTIVES: Adenosine diphosphate (ADP), which is usually secreted from activated platelets, may activate integrins on vascular smooth muscle cells, resulting in adhesion and proliferation. Integrins, mediating the ADP-stimulated adhesion and proliferation of vascular smooth muscle cells, was investigated in this study. MATERIALS AND METHODS: Prothrombin (PT) and bone sialoprotein (BSP) were used as activation-dependent ligands in an adhesion assay. The adhesion of human aortic smooth muscle cells (HASMC) were measured after ADP stimulation, using ligand-coated 24-well plates. The 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyltetrazolium bromide (MTT) assay was used to evaluate the ADP-stimulated proliferation of the HASMC.RESULTS: ADP activated the HASMC to increase their adhesion to the PT or BSP, and their proliferation in a dose-dependent manner. The adhesion of the ADP-stimulated HASMC to the PT was completely blocked by P5H9, a blocking monoclonal Ab (mAb) to integrin alphavbeta5 (92% inhibition), but was only slightly inhibited by LM609, a blocking mAb to integrin alphavbeta3 (30% inhibition). The adhesion of the ADP-stimulated HASMC to the BSP was partially inhibited by both P5H9 (46% inhibition) and JBS5, a blocking mAb to integrin alpha5beta1 (75% inhibition), but was not affected by c7E3, a blocking mAb to integrin beta3. The ADP-stimulated proliferation of the HASMC was inhibited by both c7E3 and LM609 (98% and 93% inhibition, respectively), but not by either P1F5, a blocking mAb to integrin alphavbeta5 or JBS5. CONCLUSION: These results indicate the different roles of integrins on vascular smooth muscle cells after ADP stimulation; the integrins alphavbeta5 and alpha5beta1 for adhesion, and the integrin alphavbeta3 for proliferation.
