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(Circulation Research. 2005;96:974.)
© 2005 American Heart Association, Inc.

Molecular Medicine

Role of Histamine Produced by Bone Marrow–Derived Vascular Cells in Pathogenesis of Atherosclerosis

Yasuyuki Sasaguri, Ke-Yong Wang, Akihide Tanimoto, Masato Tsutsui, Hikaru Ueno, Yoshitaka Murata, Yukari Kohno, Sohsuke Yamada, Hiroshi Ohtsu

From the Department of Pathology and Cell Biology (Y.S., K.-Y.W., Y.K., S.Y.), School of Medicine, University of Occupational and Environmental Health, Yahatanishi-ku, Kitakyushu; Department of Pathology (A.T.), Toranomon Hospital and Okinaka Memorial Institute for Medical Research, Minato-ku, Tokyo; Department of Pharmacology (M.T.), School of Medicine, University of Occupational and Environmental Health; Department of Biochemistry and Molecular Pathophysiology (H.U.), School of Medicine, University of Occupational and Environmental Health; Department of Kyurin Omtest Laboratory (Y.M.), Kyurin Pacell Corporation, Takanosu, Yahatanishi-ku, Kitakyushu; and the Department of Quantum Science and Energy Engineering (H.O.), School of Engineering, Tohoku University, Aoba-ku, Sendai, Japan.

Correspondence to Yasuyuki Sasaguri, MD, PhD, Department of Pathology and Cell Biology, School of Medicine, University of Occupational and Environmental of Health, Kitakyushu 807-8555, Japan. E-mail yasu-s{at}med.uoeh-u.ac.jp

To clarify the role of histamine-producing cells and its origin in atherosclerosis, we investigated histidine decarboxylase (HDC; histamine-producing enzyme) expression in murine arteries with vascular injuries after the animal had received transplanted bone marrow (BM) from green fluorescent protein (GFP)–transgenic mice. The neointima in the ligated carotid arteries contained BM-derived HDC⁺ cells that expressed macrophage (Mac-3) or smooth muscle cell antigen (-SMA). In contrast, the HDC⁺ BM-derived cells, which were positive for Mac-3, were mainly located in the adventitia in the cuff replacement model. In apolipoprotein E-knockout mice on a high cholesterol diet, BM-derived cells expressing Mac-3 in the atheromatous plaques were also positive for HDC. In comparison with wild-type mice, HDC^–/– mice showed reduced neointimal thickening and a decreased intima-to-media ratio after ligation and cuff replacement. These results indicate that histamine produced from BM-derived progenitor cells, which could transdifferentiate into SMC- or macrophage-like cells, are important for the formation of neointima and atheromatous plaques.

Key Words: histamine • histidine decarboxylase • progenitor cells • bone marrow • vascular injury

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