Ibudilast-Induced Decreases in Cytosolic Ca2+ Level and Contraction in Rat Aorta
The mechanism by which ibudilast induces vasodilation was examined in isolated endothelium-denuded rat aorta. Ibudilast inhibited the contractions induced by phenylephrine (PE) and high K+ with decrease of [Ca2+]i level in a concentration-dependent manner, to the same degree. 3-Isobutyl-1-methylxant...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Book |
| Published: |
Elsevier,
2007-01-01T00:00:00Z.
|
| Subjects: | |
| Online Access: | Connect to this object online. |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The mechanism by which ibudilast induces vasodilation was examined in isolated endothelium-denuded rat aorta. Ibudilast inhibited the contractions induced by phenylephrine (PE) and high K+ with decrease of [Ca2+]i level in a concentration-dependent manner, to the same degree. 3-Isobutyl-1-methylxanthine (IBMX) inhibited PE-induced contraction and [Ca2+]i level in a concentration-dependent manner, but it inhibited high K+-induced contraction without decrease of [Ca2+]i level. In comparison with IBMX, the increases of cAMP and cGMP contents in ibudilast were much smaller than that of muscle tension. Ibudilast did not inhibit 12-deoxyphorbol 13-isobutyrate (DPB)-induced contraction in the presence of verapamil. Treatment with 30 µM ibudilast inhibited the extracellularly added Ca2+-induced muscle tension and increases in [Ca2+]i level during high K+ depolarization. These results suggested that ibudilast inhibited PE- and high K+-induced muscle contractions mainly by the inhibition of [Ca2+]i level in endothelium-denuded rat aorta. Keywords:: ibudilast, smooth muscle, cAMP, cGMP, rat aorta |
|---|---|
| Item Description: | 1347-8613 10.1254/jphs.FP0070073 |