Babaahmadi-Rezaei H, Kheirollah A, Rashidi M, Seif F, Niknam Z, Zamanpour M. EGF Receptor Transactivation by Endothelin-1 Increased CHSY-1 Mediated by NADPH Oxidase and Phosphorylation of ERK1/2.
Cell J 2021;
23:510-515. [PMID:
34837677 PMCID:
PMC8588823 DOI:
10.22074/cellj.2021.7392]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/12/2020] [Accepted: 09/14/2020] [Indexed: 11/10/2022]
Abstract
Objective
Growth factors [transforming growth factor-β (TGF-β), epidermal growth factor (EGF), endothelin-1 (ET-
1)] stimulate proteoglycan synthesis resulting in retention and accumulation of low density lipoprotein (LDL) in vessel
intima and leading to atherosclerosis development. This study investigated the role of ET-1 on the expression of
CHSY1, proteoglycan synthesizing enzyme, through both EGF and TGF-β receptor transactivation in human vascular
smooth muscle cells (VSMCs). Also, we explored the involvement of NADPH oxidase (NOX), an important intermediate
of redox signaling, in ET-1 transactivated EGF receptor (EGFR) through endothelin receptors.
Materials and Methods
In this experimental study, phosphorylated ERK1/2 and CHSY1 protein levels in the human
VSMCs were measured by Western blot analysis using anti phospho-ERK1/2 (Thr202/Tyr204) and anti CHSY1
antibodies.
Results
ET-1 (100 nM) and EGF (100 ng/ml) stimulated ERK1/2 phosphorylation and inhibited in the presence of
bosentan (ET receptor inhibitor), AG1478 (EGFR inhibitor), and DPI (NOX antagonist). Also, ET-1 treatment increased
CHSY1 enzyme level; this response was suppressed by bosentan, AG1478, DPI, and SB431542, TGF-β receptor
antagonist. This study revealed that ET-1 increases expression of CHSY1 through transactivation of EGF and TGF-β
receptors.
Conclusion
Transactivation through the EGF receptor mediated by phospho-ERK1/2 leads to expression of CHSY1
protein. EGF receptor transactivation by ET-1 is shown for the first time, to be dependent on NOX enzymes.
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