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Article

Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1

  • Authors:
    • Xiu-Ying Li
    • Ling-Xi Kong
    • Juan Li
    • Hai-Xia He
    • Yuan-Da Zhou
  • View Affiliations / Copyright

    Affiliations: Department of Pharmacy, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400010, P.R. China
  • Pages: 331-338
    |
    Published online on: December 5, 2012
       https://doi.org/10.3892/ijmm.2012.1204
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Abstract

The accumulation of foam cells in atherosclerotic lesions is a hallmark of early-stage atherosclerosis. Kaempferol has been shown to inhibit oxidized low-density lipoprotein (oxLDL) uptake by macrophages; however, the underlying molecular mechanisms are not yet fully investigated. In this study, we shown that treatment with kaempferol markedly suppresses oxLDL-induced macrophage foam cell formation, which occurs due to a decrease in lipid accumulation and an increase in cholesterol efflux from THP-1-derived macrophages. Additionally, the kaempferol treatment of macrophages led to the downregulation of cluster of differentiation 36 (CD36) protein levels, the upregulation of ATP-binding cassette (ABC) transporter A1 (ABCA1), scavenger receptor class B type I (SR-BI) and ABCG1 protein levels, while no effects on scavenger receptor A (SR-A) expression were observed. Kaempferol had similar effects on the mRNA and protein expression of ABCA1, SR-BI, SR-A, CD36 and ABCG1. The reduced CD36 expression following kaempferol treatment involved the inhibition of c-Jun-activator protein-1 (AP-1) nuclear translocation. The inhibition of AP-1 using the inhibitor, SP600125, confirmed this involvement, as the AP-1 inhibition significantly augmented the kaempferol-induced reduction in CD36 expression. Accordingly, the kaempferol-mediated suppression of lipid accumulation in macrophages was also augmented by SP600125. The increased expression of ABCA1, SR-BI and ABCG1 following kaempferol treatment was accompanied by the enhanced protein expression of heme oxygenase-1 (HO-1). This increase was reversed following the knockdown of the HO-1 gene using small hairpin RNA (shRNA). Moreover, the kaempferol-mediated attenuation of lipid accumulation and the promotion of cholesterol efflux was also inhibited by HO-1 shRNA. In conclusion, the c-Jun-AP‑1-dependent downregulation of CD36 and the HO-1-dependent upregulation of ABCG1, SR-BI and ABCA1 may mediate the beneficial effects of kaempferol on foam cell formation.
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Copy and paste a formatted citation
Spandidos Publications style
Li X, Kong L, Li J, He H and Zhou Y: Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1. Int J Mol Med 31: 331-338, 2013.
APA
Li, X., Kong, L., Li, J., He, H., & Zhou, Y. (2013). Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1. International Journal of Molecular Medicine, 31, 331-338. https://doi.org/10.3892/ijmm.2012.1204
MLA
Li, X., Kong, L., Li, J., He, H., Zhou, Y."Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1". International Journal of Molecular Medicine 31.2 (2013): 331-338.
Chicago
Li, X., Kong, L., Li, J., He, H., Zhou, Y."Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1". International Journal of Molecular Medicine 31, no. 2 (2013): 331-338. https://doi.org/10.3892/ijmm.2012.1204
Copy and paste a formatted citation
x
Spandidos Publications style
Li X, Kong L, Li J, He H and Zhou Y: Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1. Int J Mol Med 31: 331-338, 2013.
APA
Li, X., Kong, L., Li, J., He, H., & Zhou, Y. (2013). Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1. International Journal of Molecular Medicine, 31, 331-338. https://doi.org/10.3892/ijmm.2012.1204
MLA
Li, X., Kong, L., Li, J., He, H., Zhou, Y."Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1". International Journal of Molecular Medicine 31.2 (2013): 331-338.
Chicago
Li, X., Kong, L., Li, J., He, H., Zhou, Y."Kaempferol suppresses lipid accumulation in macrophages through the downregulation of cluster of differentiation 36 and the upregulation of scavenger receptor class B type I and ATP-binding cassette transporters A1 and G1". International Journal of Molecular Medicine 31, no. 2 (2013): 331-338. https://doi.org/10.3892/ijmm.2012.1204
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