Stimulation of Dopamine D3 Receptor Attenuates Renal Ischemia-Reperfusion Injury via Increased Linkage With Gα12. Issue 11 (November 2015)

• Record Type: Journal Article
• Authors: Wang, Zhen; Guan, Weiwei; Han, Yu; Ren, Hongmei; Tang, Xiaofeng; Zhang, Hui; Liu, Yukai; Fu, Jinjuan; He, Duofen; Asico, Laureano D.; Jose, Pedro A.; Zhou, Lin; Chen, Liyong; Zeng, Chunyu
• Is Part Of: Transplantation. Volume 99:Issue 11(2015)
• Publication Date: 2015-11
• Subjects: Transplantation of organs, tissues, etc -- Periodicals; Transplantation immunology -- Periodicals; 617.95
• DOI: 10.1097/TP.0000000000000762
• Languages: English
• ISSNs: 0041-1337

Abstract

Abstract : Background: Renal ischemia-reperfusion (I/R) injury causes renal tubular necrosis, apoptosis, and inflammation leading to acute renal dysfunction. Recent studies have revealed that deletion of Gα12 mitigates the renal damage due to I/R injury. Our previous study showed that activation of dopamine D3 receptor (D3 R) increased its linkage with Gα12, and hampered Gα12-mediated stimulation of renal sodium transport. In the present study, we used an in-vivo rat model and an in vitro study of the renal epithelial cell line (NRK52E) to investigate whether or not an increased linkage between D3 R and Gα12 contributes to the protective effect of D3 R on renal I/R injury. Methods: For in vivo studies, I/R injury was induced in a rat renal unilateral clamping model. For in vitro studies, hypoxia/reoxygenation and cold storage/rewarming injuries were performed in NRK52E cells. PD128907, a D3 R agonist, or vehicle, was administered 15 minutes before clamping (or hypoxia) in both the in vivo or in vitro studies. Results: In the rat renal unilateral clamping model, pretreatment with PD128907 (0.2 mg/kg, intravenous) protected against renal I/R injury and increased survival rate during a long-term follow-up after 7 days. A decrease in the generation of reactive oxygen species, apoptosis, and inflammation may be involved in the D3 R-mediated protection because pretreatment with PD128907 increased renal glutathione and superoxide dismutase levels and decreased malondialdehyde levels in the I/R group. The increase in cytokines (TNF-α, IL-1β, and IL-10) and myeloperoxidase in I/R injured kidney was also prevented with a simultaneous decrease in the apoptosis of the epithelial cells and expression of apoptosis biomarkers in kidney harvested 1 day after I/R injury. The increase in the coimmunoprecipitation between D3 R and Gα12 with D3 R stimulation paralleled the observed renal protection from I/R injury. Moreover, in vitro studies showed that transient overexpression of Gα12 in the NRK52E cells attenuated the protective effect of PD128907 on hypoxia/reoxygenation injury. The protective effect of PD128907 might be of significance to renal transplantation because cold storage/rewarming induced injury increased lactate dehydrogenase release and decreased cell viability in NRK52E cells. Conversely, in the presence of PD128907, the increased lactate dehydrogenase release and decreased cell viability were reversed. Conclusions: These results suggest that activation of D3 R, by decreasing Gα12-induced renal damage, may exert a protective effect from I/R injury. Abstract : The authors show that the protective effect of G proteins in ischemia reperfusion injury is the result of the interaction of these proteins with the dopamine D3 receptor (D3R) resulting in decreased production of ROS and inflammation.