Abstract
Apolipoprotein A-I (ApoA-I) is a key component of reverse cholesterol transport in humans. In the previous studies, we demonstrated expression of the apoA-I gene in human monocytes and macrophages; however, little is known on the regulation of the apoA-I expression in macrophages during the uptake of modified low-density lipoprotein (LDL), which is one of the key processes in the early stages of atherogenesis leading to formation of foam cells. Here, we demonstrate a complex nature of the apoA-I regulation in human macrophages during the uptake of oxidized LDL (oxLDL). Incubation of macrophages with oxLDL induced expression of the apoA-I gene within the first 24 hours, but suppressed it after 48 h. Both effects depended on the interaction of oxLDL with the TLR4 receptor, rather than on the oxLDL uptake by the macrophages. The oxLDL-mediated downregulation of the apoA-I gene depended on the ERK1/2 and JNK cascades, as well as on the NF-κB cascade.
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Abbreviations
- ApoA-I:
-
apolipoprotein A-I
- BSA:
-
bovine serum albumin
- ER:
-
endoplasmic reticulum
- FCS:
-
fetal calf serum
- LDL:
-
low-density lipoprotein
- oxLDL:
-
oxidized low-density lipoprotein
- PBS:
-
phosphate buffered saline
- PMA:
-
phorbol 12-myristate 13-acetate (activator of cell differentiation and/or apoptosis in cancer models)
- THP-1:
-
human monocytic cell line derived from an acute monocytic leukemia patient
- TNFα:
-
tumor necrosis factor α
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This work was financially supported by the Russian Science Foundation (project no. 17-15-01326).
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The authors declare no conflict of interest. All procedures with the participation of human subjects were performed in accordance with the ethical standards of the Institutional and National Ethics Committees and the Helsinki Declaration of 1964 and its following revisions.
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Nekrasova, E.V., Larionova, E.E., Danko, K. et al. Regulation of Apolipoprotein A-I Gene Expression in Human Macrophages by Oxidized Low-Density Lipoprotein. Biochemistry Moscow 86, 1201–1213 (2021). https://doi.org/10.1134/S0006297921100047
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DOI: https://doi.org/10.1134/S0006297921100047