Group VIA phospholipase A2 is a target for vasopressin signaling in the thick ascending limb.

Group VIA phospholipase A2 is a target for vasopressin signaling in the thick ascending limb.
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VIA 组磷脂酶 A2 是粗升肢中加压素信号传导的靶标

DOI:
10.1152/ajprenal.00222.2011
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发表时间:
2012
期刊:
American journal of physiology. Renal physiology
影响因子:
--
通讯作者:
Bachmann S.
Bachmann S.
中科院分区:
--
文献类型:
--
作者:
Paliege A;Roeschel T;Neymeyer H;Seidel S;Kahl T;Daigeler A.L;Mutig K;Mrowka R;Ferreri N.R;Wilson B.S;Himmerkus N;Bleich M. ;Bachmann S.

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AVP通过V2受体/PKA/cAMP信号通路刺激Na ~+-K ~+-2 Cl ~+协同转运蛋白(NKCC ~ 2)介导的粗升支(TAL)对NaCl的重吸收。该过程被局部产生的类二十烷酸如20-HETE或前列腺素E2拮抗,其在磷脂酶A2依赖性反应级联中合成。使用基于微阵列的基因表达分析,我们发现了大鼠外髓质中PLA 2的钙非依赖性亚型iPLA 2 β的AVP依赖性下调的证据。因此,在本研究中,我们检查了iPLA 2 β对NKCC 2调节的贡献。在培养的mTAL细胞以及啮齿动物和人类的整个TAL中检测到免疫反应性iPLA 2 β蛋白,但致密斑除外。对AVP缺陷型尿崩症大鼠给予V2受体选择性激动剂去氨加压素(5 ng/h; 3天),可使外髓磷酸化NKCC 2(pNKCC 2)水平增加两倍以上,同时iPLA 2 β丰度显著降低(−65%;P< 0.05),从而证实了微阵列结果。用FKGK 11(0.5 μM)抑制Sprague-Dawley大鼠中的iPLA 2 β或用FKGK 11(10 μM)或(S)-溴烯醇内酯(5 μM)抑制mTAL细胞中的iPLA 2 β 1 h可显著增加pNKCC 2水平,但不影响总NKCC 2表达。总的来说,这些数据表明iPLA 2 β作为NKCC 2活性的抑制性调节剂,并表明iPLA 2 β的下调可能是AVP介导的尿液浓度的相关步骤。
Na+-K+-2Cl−cotransporter (NKCC2)-mediated NaCl reabsorption in the thick ascending limb (TAL) is stimulated by AVP via V2 receptor/PKA/cAMP signaling. This process is antagonized by locally produced eicosanoids such as 20-HETE or prostaglandin E2, which are synthesized in a phospholipase A2-dependent reaction cascade. Using microarray-based gene expression analysis, we found evidence for an AVP-dependent downregulation of the calcium-independent isoform of PLA2, iPLA2β, in the outer medulla of rats. In the present study, we therefore examined the contribution of iPLA2β to NKCC2 regulation. Immunoreactive iPLA2β protein was detected in cultured mTAL cells as well as in the entire TAL of rodents and humans with the exception of the macula densa. Administration of the V2 receptor-selective agonist desmopressin (5 ng/h; 3 days) to AVP-deficient diabetes insipidus rats increased outer medullary phosphorylated NKCC2 (pNKCC2) levels more than twofold in association with a marked reduction in iPLA2β abundance (−65%;P< 0.05), thus confirming microarray results. Inhibition of iPLA2β in Sprague-Dawley rats with FKGK 11 (0.5 μM) or in mTAL cells with FKGK 11 (10 μM) or (S)-bromoenol lactone (5 μM) for 1 h markedly increased pNKCC2 levels without affecting total NKCC2 expression. Collectively, these data indicate that iPLA2β acts as an inhibitory modulator of NKCC2 activity and suggest that downregulation of iPLA2β may be a relevant step in AVP-mediated urine concentration.
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