PT - JOURNAL ARTICLE AU - White, Sarah M. AU - North, Lauren M. AU - Haines, Emily AU - Goldberg, Megan AU - Sullivan, Lydia M. AU - Pressly, Jeffrey D. AU - Weber, David S. AU - Park, Frank AU - Regner, Kevin R. TI - G-Protein <em>βγ</em> Subunit Dimers Modulate Kidney Repair after Ischemia-Reperfusion Injury in Rats AID - 10.1124/mol.114.092346 DP - 2014 Oct 01 TA - Molecular Pharmacology PG - 369--377 VI - 86 IP - 4 4099 - http://molpharm.aspetjournals.org/content/86/4/369.short 4100 - http://molpharm.aspetjournals.org/content/86/4/369.full SO - Mol Pharmacol2014 Oct 01; 86 AB - Heterotrimeric G-proteins play a crucial role in the control of renal epithelial cell function during homeostasis and in response to injury. In this report, G-protein βγ subunit (Gβγ) dimer activity was evaluated during the process of tubular repair after renal ischemia-reperfusion injury (IRI) in male Sprague Dawley rats. Rats were treated with a small molecule inhibitor of Gβγ activity, gallein (30 or 100 mg/kg), 1 hour after reperfusion and every 24 hours for 3 additional days. After IRI, renal dysfunction was prolonged after the high-dose gallein treatment in comparison with vehicle treatment during the 7-day recovery period. Renal tubular repair in the outer medulla 7 days after IRI was significantly (P &lt; 0.001) attenuated after treatment with high-dose gallein (100 mg/kg) in comparison with low-dose gallein (30 mg/kg), or the vehicle and fluorescein control groups. Gallein treatment significantly reduced (P &lt; 0.05) the number of proliferating cell nuclear antigen–positive tubular epithelial cells at 24 hours after the ischemia-reperfusion phase in vivo. In vitro application of gallein on normal rat kidney (NRK-52E) proximal tubule cells significantly reduced (P &lt; 0.05) S-phase cell cycle entry compared with vehicle-treated cells as determined by 5′-bromo-2′-deoxyuridine incorporation. Taken together, these data suggest that Gβγ signaling contributes to the maintenance and repair of renal tubular epithelium and may be a novel therapeutic target for the development of drugs to treat acute kidney injury.