Journal: American Journal of Physiology - Renal Physiology
Article Title: Natriuretic effect by exendin-4, but not the DPP-4 inhibitor alogliptin, is mediated via the GLP-1 receptor and preserved in obese type 2 diabetic mice
doi: 10.1152/ajprenal.00259.2012
Figure Lengend Snippet: Effects of EX4 and ALG on phosphorylated Na+/H+ exchanger (NHE3) in renal membranes and plasma dipeptidyl peptidase-4 (DPP-4) activity. Kidneys and plasma were harvested 1 h after application of EX4 (10 μg/kg body wt ip), ALG (10 mg/kg body wt ip), or vehicle (0.85% NaCl, 2 μl/g body wt). A–C: natriuretic response to EX4, but not ALG, was associated with increased NHE3 phosphorylated at S552 (pS552) and S605 (pS605) in renal membranes. This effect of EX4 was absent in Glp1r−/− mice. Values are means ± SE; n = 5 per group. *P < 0.05 vs. vehicle. D: ALG inhibited DPP-4 activity in WT and Glp1r−/− mice. Data are expressed relative to the mean of the vehicle-treated WT group, which was set as 100%. EX4 was without effect. Values are means ± SE; n = 5 per group. *P < 0.05 vs. vehicle.
Article Snippet: Immunoblotting was performed at 4°C overnight with the primary NHE3 Ab (Millipore, Billerica, MA), phosphorylated (S552) NHE3 Ab (Novus Biologicals, Littleton, CO), and phosphorylated (S605) NHE3 Ab (Santa Cruz Biotechnology, Santa Cruz, CA) diluted 1:1,000, 1:1,000, and 1:200, respectively.
Techniques: Clinical Proteomics, Activity Assay