Journal
AMERICAN JOURNAL OF PATHOLOGY
Volume 173, Issue 6, Pages 1902-1910Publisher
ELSEVIER SCIENCE INC
DOI: 10.2353/ajpath.2008.080201
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Funding
- NCRR NIH HHS [P20 RR021954, P20 RR021954-01A2] Funding Source: Medline
- NHLBI NIH HHS [R01 HL082772, P01 HL086670, HL082772, HL086670] Funding Source: Medline
- NATIONAL CENTER FOR RESEARCH RESOURCES [P20RR021954] Funding Source: NIH RePORTER
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [R01HL082772, P01HL086670] Funding Source: NIH RePORTER
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Inflammatory markers serum amyloid A (SAA) and C-reactive protein (CRP) are predictive of cardiac disease and are proposed to play causal roles in the development of atherosclerosis, in which the retention of lipoproteins by vascular wall proteoglycans is critical. The purpose of this study was to determine whether SAA and/or CRP alters vascular proteoglycan synthesis and lipoprotein retention in a pro-atherogenic manner. Vascular smooth muscle cells were stimulated with either SAA or CRP (1 to 100 mg/L) and protcoglycans were then isolated and characterized. SAA, but not CRP, increased proteoglycan sulfate incorporation by 50 to 100% in a dose-dependent manner (P < 0.0001), increased glycosaminoglycan chain length, and increased low-density lipoprotein (LDL) binding affinity (K-d, 29 mu g/ml LDL versus 90 mu g/ml LDL for SAA versus control proteoglycans; P < 0.005). Furthermore, SAA up-regulated biglycan via the induction of endogenous transforming growth factor (TGF)-beta. To determine whether SAA stimulated proteoglyean synthesis in vivo, ApoE(-/-) mice were injected with an adenovirus expressing human SAA-1, a null virus, or saline. Mice that received adenovirus expressing SAA had increased TGF-beta concentrations in plasma and increased aortic biglycan content compared with mice that received either null virus or saline. Thus, SAA alters vascular proteoglycans in a pro-atherogenic manner via the stimulation of TGF-beta and may play a causal role in the development of atherosclerosis. (Am J Pathol 2008, 173:1902-1910; DOI: 10.2353/ajpath.2008.080201)
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