Abstract:
:Neovascularization occurring in atherosclerotic plaque leads to acceleration of plaque growth through increased leukocyte infiltration and reactive oxygen species (ROS) production. Sema4D (CD100), a class IV semaphorin, not only plays a crucial role in axon guidance but also functions in the neovascularization process of tumor growth. To clarify the roles of Sema4D in the progression of atherosclerosis and neovascularization of atherosclerotic plaque, we analyzed the effect of Sema4D gene deletion from apolipoprotein E (ApoE)-deficient mice in the development of atherosclerosis. Lipid staining demonstrated significant decreases in plaque areas in the aortas of 6-month-old Sema4D-/- ApoE-/- mice compared with 6-month-old ApoE-/- mice. Thus, the Sema4D gene knockout in ApoE-deficient mice was found to slow the progression of atherosclerosis. Immunohistochemical analyses confirmed the expression of Sema4D protein in infiltrating lymphoid cells in atherosclerotic plaque and plexin-B1 receptor in neovascular endothelial cells within the plaque. Furthermore, there were significant decreases in the degree of neovascularization in the plaque areas of Sema4D-/- ApoE-/- mice compared with ApoE-/- mice as revealed by both isolectin B4 and CD31 staining. The number of infiltrating macrophages in Sema4D-/- ApoE-/- mice plaques was also significantly less than those in ApoE-/- mice. These findings suggest that Sema4D is involved in the progression phase of atherosclerosis by accelerating intimal neovascularization, resulting in enhanced macrophage infiltration in atherosclerotic plaques.
journal_name
Int J Mol Medjournal_title
International journal of molecular medicineauthors
Yukawa K,Tanaka T,Kishino M,Yoshida K,Takeuchi N,Ito T,Takamatsu H,Kikutani H,Kumanogoh Adoi
10.3892/ijmm_00000432subject
Has Abstractpub_date
2010-07-01 00:00:00pages
39-44issue
1eissn
1107-3756issn
1791-244Xjournal_volume
26pub_type
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