title: Deterioration of atherosclerosis in mice lacking angiotensin II type 1A receptor in bone marrow-derived cells.
abstract: The renin-angiotensin system (RAS) modulates end-organ damages, resulting in cardiovascular and kidney diseases. Experiments both in vitro and in vivo demonstrate that the angiotensin II (Ang II) type 1 (AT1) receptor pathway also exerts pro-inflammatory and pro-atherogenic effects on bone marrow-derived cells (BMDCs). Here, we investigated how AT1 receptor expression by BMDCs contributes to atherosclerosis and kidney injury in vivo by transplanting BM into RAS-activated transgenic mice. There was no difference in the extent of kidney damage between mice receiving BM transplants from mutant mice lacking the angiotensin II type 1a receptor (AT1a) gene and mice receiving transplants from wild-type (WT) mice. However, mice receiving transplants from AT1a 'knockout' (KO) mice displayed accelerated lethality and atherosclerotic lesions. These results indicated that the effects of AT1a receptor on BMDCs are organ dependent. Microarray expression profiling of macrophages from AT1a-KO mice revealed significant changes in the mRNA levels for a number of genes implicated in atherosclerosis. In accordance with the in vivo atherosclerosis results, AT1a-KO macrophages exhibited greater uptake of modified lipoproteins relative to macrophages from WT mice. We propose that the expression of AT1a receptor by BMDCs limits atherosclerosis in vivo.
authors.affiliation: Center for Tsukuba Advanced Research Alliance (TARA), University of Tsukuba, Ibaraki, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Kato
authors.forename: Junji
authors.initials: J
authors.lastname: Ishida
authors.forename: Katsumasa
authors.initials: K
authors.lastname: Nagano
authors.forename: Kaori
authors.initials: K
authors.lastname: Honjo
authors.forename: Takeshi
authors.initials: T
authors.lastname: Sugaya
authors.forename: Norifumi
authors.initials: N
authors.lastname: Takeda
authors.forename: Fumihiro
authors.initials: F
authors.lastname: Sugiyama
authors.forename: Ken-Ichi
authors.initials: K
authors.lastname: Yagami
authors.forename: Toshiro
authors.initials: T
authors.lastname: Fujita
authors.forename: Masaomi
authors.initials: M
authors.lastname: Nangaku
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Fukamizu
mesh_terms: D000818:Animals; D001011:Aorta / Q000473:pathology; D050197:Atherosclerosis / Q000378:metabolism / Q000473:pathology*; D001854:Bone Marrow Cells / Q000378:metabolism / Q000473:pathology*; D016026:Bone Marrow Transplantation; D002478:Cells, Cultured; D005260:Female; D020869:Gene Expression Profiling; D007668:Kidney / Q000378:metabolism / Q000473:pathology; D017737:Macrophages, Peritoneal / Q000378:metabolism / Q000473:pathology; D051379:Mice; D008822:Mice, Transgenic; D020411:Oligonucleotide Array Sequence Analysis; D044140:Receptor, Angiotensin, Type 1 / Q000235:genetics / Q000502:physiology*; D013154:Spleen / Q000378:metabolism
chemical_list: D044140:Receptor, Angiotensin, Type 1