From the Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis (C.T.B., M.M.G., D.A.V.H., J.W.O.).
Department of Pharmacology and Toxicology, Michigan State University, East Lansing (G.D.F.).
Hypertension. 2019 May;73(5):1079-1086. doi: 10.1161/HYPERTENSIONAHA.119.12762.
Recent reports indicate that, in addition to treating hypertension, renal denervation (RDN) also mitigates renal inflammation. However, because RDN decreases renal perfusion pressure, it is unclear whether these effects are because of the direct effects of RDN on inflammatory signaling or secondary to decreased arterial pressure (AP). Therefore, this study was conducted to elucidate the contribution of renal nerves to renal inflammation in the deoxycorticosterone (DOCA)-salt rat, a model in which RDN decreases AP and abolishes renal inflammation. In Experiment 1, we assessed the temporal changes in renal inflammation by measuring renal cytokines and AP in DOCA-salt rats. Uninephrectomized (1K) adult male Sprague Dawley rats that received surgical RDN or sham (Sham) were administered DOCA (100 mg, SC) and 0.9% saline for 21 days. AP was measured by radiotelemetry, and urinary cytokine excretion was measured repeatedly. In Experiment 2, the contribution of renal nerves in renal inflammation was assessed in a 2-kidney DOCA-salt rat to control for renal perfusion pressure. DOCA-salt treatment was administered after unilateral (U-)RDN. In Experiment 1, DOCA-salt-induced increases in AP and renal inflammation (assessed by urinary cytokines) were attenuated by RDN versus Sham. In Experiment 2, GRO/KC (growth-related oncogene/keratinocyte chemoattractant), MCP (monocyte chemoattractant protein)-1, and macrophage infiltration were lower in the denervated kidney versus the contralateral Sham kidney. No differences in T-cell infiltration were observed. Together, these data support the hypothesis that renal nerves mediate, in part, the development of renal inflammation in the DOCA-salt rat independent of hypertension. The mechanisms and cell-specificity mediating these effects require further investigation.
最近的报告表明,除了治疗高血压,肾去神经(RDN)还可以减轻肾脏炎症。然而,由于 RDN 降低了肾灌注压,尚不清楚这些作用是由于 RDN 对炎症信号的直接作用,还是继发于动脉压(AP)下降。因此,本研究旨在阐明肾神经在去氧皮质酮(DOCA)-盐大鼠中的作用,该模型中 RDN 降低 AP 并消除了肾脏炎症。在实验 1 中,我们通过测量 DOCA-盐大鼠的肾细胞因子和 AP 来评估肾炎症的时间变化。接受单侧(1K)肾切除术的成年雄性 Sprague Dawley 大鼠接受手术 RDN 或假手术(Sham),并接受 DOCA(100mg,SC)和 0.9%生理盐水治疗 21 天。通过无线电遥测测量 AP,反复测量尿细胞因子排泄量。在实验 2 中,评估了 2 肾 DOCA-盐大鼠中肾神经在肾炎症中的作用,以控制肾灌注压。在单侧 RDN 后给予 DOCA-盐治疗。在实验 1 中,与 Sham 相比,RDN 降低了 DOCA-盐诱导的 AP 和肾炎症(通过尿细胞因子评估)的增加。在实验 2 中,与对侧 Sham 肾相比,去神经肾中的 GRO/KC(生长相关癌基因/角质细胞趋化因子)、MCP(单核细胞趋化蛋白)-1 和巨噬细胞浸润较低,T 细胞浸润无差异。这些数据支持以下假说:肾神经介导了 DOCA-盐大鼠肾炎症的发展,部分独立于高血压。需要进一步研究介导这些作用的机制和细胞特异性。