PDE4B Is a Homeostatic Regulator of Cyclic AMP in Dendritic Cells.

PDE4B Is a Homeostatic Regulator of Cyclic AMP in Dendritic Cells.
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DOI:
10.3389/fphar.2022.833832
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发表时间:
2022
影响因子:
5.6
通讯作者:
Insel PA
Insel PA
中科院分区:
医学2区
文献类型:
--
作者:
Chinn AM;Salmerón C;Lee J;Sriram K;Raz E;Insel PA

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第二信使环AMP (cAMP)的慢性减少发生在许多情况下,但细胞如何补偿这种减少是未知的。我们使用了一种独特的系统-小鼠树突状细胞(dc), dc选择性地消耗异三聚体GTP结合蛋白g - αs来解决这个问题。这些小鼠自发发展为th2过敏性哮喘,其dc的cAMP水平持续降低。我们发现磷酸二酯酶4B (PDE4B)是dc中主要表达的磷酸二酯酶,在g αs缺失的dc中其表达优先降低。PDE4B的表达是动态的,以蛋白激酶a依赖的方式分别随着cAMP浓度的降低和增加而下降和上升。用PDE4B抑制剂治疗驱动Th2免疫增强的dc可改善dc诱导的辅助性T细胞应答。我们得出结论,PDE4B是dc细胞cAMP浓度的稳态调节剂,可能是治疗th2过敏性哮喘和其他低细胞cAMP浓度的靶点。
Chronic decreases in the second messenger cyclic AMP (cAMP) occur in numerous settings, but how cells compensate for such decreases is unknown. We have used a unique system—murine dendritic cells (DCs) with a DC-selective depletion of the heterotrimeric GTP binding protein Gαs—to address this issue. These mice spontaneously develop Th2-allergic asthma and their DCs have persistently lower cAMP levels. We found that phosphodiesterase 4B (PDE4B) is the primary phosphodiesterase expressed in DCs and that its expression is preferentially decreased in Gαs-depleted DCs. PDE4B expression is dynamic, falling and rising in a protein kinase A-dependent manner with decreased and increased cAMP concentrations, respectively. Treatment of DCs that drive enhanced Th2 immunity with a PDE4B inhibitor ameliorated DC-induced helper T cell response. We conclude that PDE4B is a homeostatic regulator of cellular cAMP concentrations in DCs and may be a target for treating Th2-allergic asthma and other settings with low cellular cAMP concentrations.
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