Prostaglandin E(2) produced by the lung augments the effector phase of allergic inflammation.

Prostaglandin E(2) produced by the lung augments the effector phase of allergic inflammation.
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DOI:
10.4049/jimmunol.1101873
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发表时间:
2012-04-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Koller BH
Koller BH
中科院分区:
其他
文献类型:
--
作者:
Church RJ;Jania LA;Koller BH

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PGE2 升高是大多数炎症病变的标志。这种脂质介质可以诱发炎症的主要症状,非甾体抗炎药的有益作用归因于对环氧合酶 COX-1 和 COX-2 的抑制,这两种酶是从花生四烯酸生物合成 PGE2 所必需的酶。然而,临床研究和啮齿动物模型都表明,在哮喘肺中,PGE2 可以抑制免疫反应并限制炎症继发的生理变化。为了直接探讨 PGE2 在肺部的作用,我们研究了缺乏微粒体前列腺素 E 合酶 1 (mPGES1) 的小鼠疾病的发展情况,该酶将 COX-1/COX-2 衍生的 PGH2 转化为 PGE2。我们发现,mPGES1 决定了幼稚肺中的 PGE2 水平,并且是卵清蛋白 (OVA) 诱导过敏后 PGE2 增加所必需的。虽然 COX-1 或 COX-2 的缺失会增加疾病的严重程度,但令人惊讶的是 mPGES1 −/− 小鼠的炎症却有所减轻。然而,在 mPGES1−/− 小鼠中仍然观察到血清 IgE 增加,这表明 PGE2 的缺失不会损害 TH2 反应的诱导。此外,表达转基因 OVA 特异性 T 细胞受体的 mPGES1 −/− 小鼠也受到保护,表明 PGE2 主要在吸入抗原攻击后发挥作用。肺部产生的 PGE2 在这种反应中发挥着关键作用,因为肺部 mPGES1 的缺失足以预防疾病。这共同支持了一个模型,其中由肺原生细胞群产生的 mPGES1 依赖性 PGE2 有助于某些过敏反应的效应阶段。
Elevated PGE2 is a hallmark of most inflammatory lesions. This lipid mediator can induce the cardinal signs of inflammation, and the beneficial actions of non-steroidal anti-inflammatory drugs are attributed to inhibition of cyclooxygenase COX-1 and COX-2, enzymes essential in the biosynthesis of PGE2 from arachidonic acid. However, both clinical studies and rodent models suggest that, in the asthmatic lung, PGE2 acts to restrain the immune response and limit physiological change secondary to inflammation. To directly address the role of PGE2 in the lung, we examined the development of disease in mice lacking microsomal prostaglandin E synthase 1 (mPGES1), which converts COX-1/COX-2 derived PGH2 to PGE2. We show that mPGES1 determines PGE2 levels in the naïve lung and is required for increases in PGE2 after ovalbumin (OVA) induced allergy. While loss of either COX-1 or COX-2 increases the disease severity, surprisingly mPGES1 −/− mice show reduced inflammation. However, an increase in serum IgE is still observed in the mPGES1 −/− mice, suggesting that loss of PGE2 does not impair induction of a TH2 response. Furthermore, mPGES1 −/− mice expressing a transgenic OVA-specific T cell receptor are also protected, indicating that PGE2 acts primarily after challenge with inhaled antigen. PGE2 produced by the lung plays the critical role in this response, as loss of lung mPGES1 is sufficient to protect against disease. Together this supports a model in which mPGES1-dependent PGE2 produced by populations of cells native to the lung contributes to the effector phase of some allergic responses.
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