TNF-alpha upregulates the A2B adenosine receptor gene: The role of NAD(P)H oxidase 4.

TNF-alpha upregulates the A2B adenosine receptor gene: The role of NAD(P)H oxidase 4.
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DOI:
10.1016/j.bbrc.2008.07.059
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发表时间:
2008-10-24
影响因子:
3.1
通讯作者:
Ravid, Katya
Ravid, Katya
中科院分区:
生物学4区
文献类型:
--
作者:
Hilaire, Cynthia St.;Koupenova, Milka;Carroll, Shannon H.;Smith, Barbara D.;Ravid, Katya

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Proliferation of vascular smooth muscle cells (VSMC), oxidative stress and elevated inflammatory cytokines are some of the components that contribute to plaque formation in the vasculature. The cytokine tumor necrosis factor–alpha (TNF-α) is released during vascular injury, and contributes to lesion formation by affecting VSMC proliferation. Recently, an A2B adenosine receptor (A2BAR) knockout mouse illustrated that this receptor is a tissue protector, in that it inhibits VSMC proliferation and attenuates the inflammatory response, including the release of TNF-α Here, we show a regulatory loop by which TNF-α upregulates the A2BAR in VSMC in vitro and in vivo. The effect of this cytokine is mimicked by its known downstream target, NAD(P)H oxidase 4 (Nox4). Nox4 upregulates the A2BAR, and Nox inhibitors dampen the effect of TNF-α. Hence, our study is the first to show that signaling associated with vascular disease, such as Nox4, is also able to upregulate the tissue protecting A2BAR.
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