Cited by 165Cholesterol and Lipid MetabolismAtherosclerosis and Cardiovascular DiseasesLipoproteins and Cardiovascular Health

Increase in Serum Amyloid A Evoked by Dietary Cholesterol Is Associated With Increased Atherosclerosis in Mice

Lewis, Katherine E., Kirk, Elizabeth A., McDonald, Thomas O., Wang, Shari, Wight, Thomas N., O’Brien, Kevin D., Chait, Alan·2004·Circulation

Abstract

Background— Elevated serum amyloid A (SAA) levels are associated with increased cardiovascular risk. SAA levels can be increased by dietary fat and cholesterol. Moreover, SAA can cause lipoproteins to bind extracellular vascular proteoglycans, a process that is critical in atherogenesis. Therefore, we hypothesized that diet-induced increases in SAA would increase atherosclerosis independent of their effect on plasma cholesterol levels. Methods and Results— Female LDL-receptor–null (LDLR −/− ) mice were fed high–saturated fat diets (21%, wt/wt), with or without added cholesterol (0.15%, wt/wt), for 10 weeks. Compared with chow-fed controls, the high-fat diets increased plasma SAA levels. Addition of cholesterol further increased SAA levels 2-fold ( P <0.05) without further increasing plasma cholesterol levels. Addition of dietary cholesterol also increased atherosclerosis ( P <0.05). Four lines of evidence suggest that SAA actually might cause atherosclerosis: (1) SAA levels when mice were euthanized correlated with the extent of atherosclerosis ( r =0.49; P <0.02); (2) SAA levels after 5 weeks of diet correlated with the extent of atherosclerosis at 10 weeks ( r =0.66; P <0.01); (3) binding of HDL from these animals to proteoglycans in vitro was related to the HDL-SAA content ( r =0.65; P <0.01); and (4) immunoreactive SAA was present in lesion areas enriched with both proteoglycans and apolipoprotein A-I, the major HDL apolipoprotein. Conclusions— Addition of cholesterol to a high-fat diet increased plasma SAA levels and atherosclerosis independent of an adverse effect on plasma lipoproteins, consistent with the hypothesis that SAA may promote atherosclerosis directly by mediating retention of SAA-enriched HDL to vascular proteoglycans.

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  1. Hoff HF, Jackson RL, Gotto AM Jr. Apolipoprotein localization in human atherosclerotic arteries. Adv Exp Med Biol. 1976;67:109 -120.

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Authors
Lewis, K. E., Kirk, E. A., McDonald, T. O., Wang, S., Wight, T. N., O’Brien, K. D., & Chait, A.
Affiliations
University of Washington (US)
Venue
Circulation
Published
2004-08-03
Volume
110
Issue
5
Pages
540-545
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W2052227721
Cited by
163
References
34
Citations by year
2026: 2 · 2025: 1 · 2024: 1 · 2023: 2 · 2022: 4 · 2021: 5 · 2020: 5 · 2019: 5 · 2018: 8 · 2017: 6 · 2016: 5 · 2015: 8 · 2014: 6 · 2013: 12 · 2012: 10
FWCI
12.00
Type
journal article
Language
en
Open access
closed
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (DK-035816, ES007033)
  • National Heart, Lung, and Blood Institute (P01HL030086, HL030086)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK 035816, P30DK035816)
  • National Institute of Environmental Health Sciences (ES007033, P30ES007033)
Topics
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Immunology and Microbiology › Immunology › Atherosclerosis and Cardiovascular Diseases
  • Health Sciences › Medicine › Surgery › Lipoproteins and Cardiovascular Health
Keywords
serum amyloid A, dietary cholesterol, atherosclerosis, high-fat diet, LDL receptor-null mice, HDL cholesterol, apolipoprotein A-I, atherogenesis, cardiovascular risk
MeSH terms
Serum Amyloid P-Component, Serum Amyloid A Protein, Animals, Aorta, Aortic Diseases, Arteriosclerosis, Cholesterol, Cholesterol, Dietary, Diet, Atherogenic, Female, Lipoproteins, HDL, Proteoglycans, Receptors, LDL, Triglycerides, Extracellular Matrix Proteins, Apolipoprotein A-I, Mice, Knockout, Mice, Biglycan

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