Abstract:
:In hypertension studies, anti-inflammatory cytokine interleukin-10 (IL-10) has been shown to prevent angiotensin II (Ang II)-induced vasoconstriction and regulate vascular function by down-regulating pro-inflammatory cytokine and superoxide production in vascular cells. However, little is known about the mechanism behind the down-regulatory effect of IL-10 on Ang II-induced hypertensive mediators. In this study, we demonstrated the effects of IL-10 on expression of dimethylarginine dimethylaminohydrolase (DDAH)-1, a regulator of NO bioavailability, as well as the down-regulatory mechanism of action of IL-10 in relation to Ang II-induced hypertensive mediator expression and cell proliferation in vascular smooth muscle cells (VSMCs) from spontaneously hypertensive rats (SHR). IL-10 increased DDAH-1 but not DDAH-2 expression and increased DDAH activity. Additionally, IL-10 attenuated Ang II-induced DDAH-1 inhibition in SHR VSMCs. Increased DDAH activity due to IL-10 was mediated mainly through Ang II subtype II receptor (AT2 R) and AMP-activated protein kinase (AMPK) activation. DDAH-1 induced by IL-10 partially mediated the inhibitory action of IL-10 on Ang II-induced 12-lipoxygenase (LO) and endothelin (ET)-1 expression in SHR VSMCs. In addition, the inhibitory effect of IL-10 on proliferation of Ang II-induced VSMCs was mediated partially via DDAH-1 activity. These results suggest that DDAH-1 plays a potentially important role in the anti-hypertensive activity of IL-10 during Ang II-induced hypertension.
journal_name
Cytokinejournal_title
Cytokineauthors
Kim HY,Kim HSdoi
10.1016/j.cyto.2015.09.002subject
Has Abstractpub_date
2016-01-01 00:00:00pages
203-10eissn
1043-4666issn
1096-0023pii
S1043-4666(15)30055-7journal_volume
77pub_type
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