Glucagon-like peptide-1 receptor (GLP-1R) expression in the CKD rat. a Western blot analysis of GLP-1R expression in rat kidney proximal tubule (NRK-52E) cells with hypoxic injury. b Western blot analysis of renal cortical GLP-1R expression in 5/6 nephrectomized rat. c Renal cortical GLP-1R immunoreactivity in CKD rats. Control, sham-operated; CKD 2, 4, 8 weeks, 5/6 nephrectomized rats 2, 4, and 8 weeks post-treatment. Black lines, separated from adjacent bands. Values are presented as the mean ± SD. *p < 0.05 vs. control. Magnification 400 ×. * The original blots of fig 5-11 are in Additional file 1: Figure S1.