Yang MX, Liu ZX, Zhang S, Jing Y, Zhang SJ, Xie WP, Ma L, Zhu CL, Wang H. Proteomic analysis of the effect of iptakalim on human pulmonary arterial smooth muscle cell proliferation.
Acta Pharmacol Sin 2009;
30:175-83. [PMID:
19169269 DOI:
10.1038/aps.2008.30]
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Abstract
AIM
To investigate the anti-proliferative effect of iptakalim (Ipt), a newly selective K(ATP) channel opener, in endothelin-1 (ET-1)-induced human pulmonary arterial smooth muscle cells (PASMCs) using proteomic analysis.
METHODS
Human PASMCs were incubated with ET-1 (10(-8) mol/L) and ET-1 (10(-8) mol/L) plus iptaklim (10(-5) mol/L) for 24 h. Analysis via 2-DE gel electrophoresis and MALDI-TOF-MS was employed to display the different protein profiles of whole-cell protein from cultures of control, ET-1 treatment alone, and treatment with ET-1 and iptaklim combined. Real time RT-PCR and Western blot analysis were used to confirm the proteomic analysis.
RESULTS
When iptakalim inhibited the proliferative effect of ET-1 in human PASMCs by opening the K(ATP) channels, the expression of different groups of cellular proteins was changed, including cytoskeleton-associated proteins, plasma membrane proteins and receptors, chaperone proteins, ion transport-associated proteins, and glycolytic and metabolism-associated proteins. We found that iptakalim could inhibit the proliferation of human PASMCs partly by affecting the expression of Hsp60, vimentin, nucleoporin P54 (NUP54) and Bcl-X(L) by opening the K(ATP) channel.
CONCLUSION
The data suggest that a wide range of signaling pathways may be involved in abolishing ET-1-induced proliferation of human PASMCs following iptakalim treatment.
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