101. Role of macrophage-derived hypoxia-inducible factor (HIF)-1α as a mediator of vascular remodelling
- Author
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Taisuke Nakayama, Masataka Sata, Michio Shimabukuro, Hajime Kinoshita, Mark Webster Maxfield, Shuhei Tomita, Yousuke Takahama, Toshiaki Tamaki, Tetsuya Kitagawa, Yuki Matsuoka, Yoichiro Hirata, Yasushi Yoshida, Hirotsugu Kurobe, Mie Sakata, Noriko Sugasawa, and Mayuko Higashida
- Subjects
Physiology ,Mutant ,Biology ,Vascular remodelling in the embryo ,Mice ,Mediator ,Immune system ,Cell Movement ,Physiology (medical) ,Adventitia ,medicine ,Animals ,HMGB1 Protein ,Interleukin-6 ,Tumor Necrosis Factor-alpha ,Macrophages ,Hypoxia (medical) ,Hypoxia-Inducible Factor 1, alpha Subunit ,medicine.disease ,Mice, Inbred C57BL ,Phenotype ,medicine.anatomical_structure ,Hypoxia-inducible factors ,Immunology ,Cancer research ,Blood Vessels ,medicine.symptom ,Cardiology and Cardiovascular Medicine ,Infiltration (medical) - Abstract
Aims Excessive vascular remodelling leads to progression of a wide range of vasculopathies, and the immune response to intimal injuries is crucial in this process. This vascular remodelling occurs in the hypoxic microenvironment and is closely related to the immune system. Macrophages play a key role in immunological-cell-mediated arterial remodelling. In this study, we clarified the role of macrophage-derived hypoxia-inducible factor (HIF-1α) in vascular remodelling. Methods and results Wire-induced femoral arterial injury was inflicted in mice lacking the macrophage-specific HIF-1α gene and in their wild-type counterparts. The mutant mice showed both suppressed wire-induced neointimal thickening and decreased infiltration of inflammatory cells in the adventitia, compared with wild-type mice. Studies to clarify the mechanism of restrained vascular remodelling in the mutant mice revealed decreased production of pro-inflammatory cytokines by the activated macrophages and suppressed macrophage migration activity in the mutant mice. Gene expressions of the HIF-1α-deficient macrophages positively correlated with the phenotypic profile of M2 macrophages and negatively correlated with that of M1 macrophages. Conclusion Our results show that HIF-1α in macrophages plays a crucial role in promoting vascular inflammation and remodelling. As decreasing HIF-1α activity in macrophages may prevent the progression of vascular remodelling, HIF-1α may be a possible therapeutic target in vascular diseases.
- Published
- 2013
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