Atherosclerosis 2004,
PMID: 15380451
Mukai, Eri; Kume, Noriaki; Hayashida, Kazutaka; Minami, Manabu; Yamada, Yuichiro; Seino, Yutaka; Kita, Toru
Receptor-mediated endocytosis of oxidized LDL (Ox-LDL) has been implicated in lipid accumulation and vascular cell dysfunction. Lectin-like Ox-LDL receptor-1 (LOX-1) is highly inducible by proinflammatory cytokines, as well as angiotensin II and Ox-LDL in vitro. LOX-1 is expressed in macrophages and smooth muscle cells accumulated in the intima of advanced atherosclerotic plaques in vivo. Here we show that heparin-binding epidermal growth factor-like growth factor (HB-EGF), a potent mitogen for vascular smooth muscle cells, induces LOX-1 expression in cultured bovine aortic smooth muscle cells. HB-EGF (1-100 ng/ml) induced LOX-1 expression, which was peaked between 8 and 16 h after HB-EGF stimulation. HB-EGF-induced expression of LOX-1 was suppressed by ZD1839, an inhibitor of EGF receptor phosphorylation. Both MEK and p38 mitogen-activated protein kinase (MAPK) inhibitors significantly blocked LOX-1 upregulation induced by HB-EGF. Phosphatidylinositol 3-kinase (PI3K) inhibitors also blocked HB-EGF-induced LOX-1 expression. HB-EGF induced phosphorylation of ERK, p38 MAPK and Akt, which were suppressed by ZD1839. Upregulated expression of LOX-1 was associated with enhanced uptake of DiI-labeled Ox-LDL in smooth muscle cells. Taken together, HB-EGF can also act as an inducer of LOX-1 expression and play an integral role in foam cell transformation, cellular dysfunction, and proliferation of smooth muscle cells in atherogenesis.
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Text Mining Data
Lectin-like Ox-LDL receptor-1 ( LOX-1 ) → Ox-LDL: "
Lectin-like Ox-LDL receptor-1 ( LOX-1 ) is highly
inducible by proinflammatory cytokines, as well as angiotensin II and
Ox-LDL in vitro
"
Lectin-like Ox-LDL receptor-1 → Ox-LDL: "
Lectin-like Ox-LDL receptor-1 ( LOX-1 ) is highly inducible by proinflammatory cytokines, as well as angiotensin II and Ox-LDL in vitro
"
LOX-1 → HB-EGF: "
HB-EGF induced expression of LOX-1 was suppressed by ZD1839, an inhibitor of EGF receptor phosphorylation
"
LOX-1 ⊣ p38: "
Both MEK and p38 mitogen activated protein kinase ( MAPK ) inhibitors significantly blocked LOX-1 upregulation induced by HB-EGF
"
LOX-1 → HB-EGF: "
Both MEK and p38 mitogen activated protein kinase ( MAPK ) inhibitors significantly blocked LOX-1 upregulation induced by HB-EGF
"
LOX-1 → HB-EGF: "
Phosphatidylinositol 3-kinase (PI3K) inhibitors also blocked HB-EGF induced LOX-1 expression
"
LOX-1 → Phosphatidylinositol 3-kinase (PI3K): "
Phosphatidylinositol 3-kinase (PI3K) inhibitors also blocked HB-EGF induced LOX-1 expression
"
MAPK → HB-EGF: "
HB-EGF induced phosphorylation of ERK, p38 MAPK and Akt, which were suppressed by ZD1839
"
HB-EGF → ERK: "
HB-EGF induced phosphorylation of ERK , p38 MAPK and Akt, which were suppressed by ZD1839
"
HB-EGF → Akt: "
HB-EGF induced phosphorylation of ERK, p38 MAPK and Akt , which were suppressed by ZD1839
"
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