Effects of GSK-3β inhibitor and lithium chloride on TNF-α (A) and RANKL (B) gene expression in osteoblasts and TNF-α (C) and RANKL (D) gene expression in osteoclasts: 1, the control group (control rats); 2, GSK-3β inhibitor group (control rats); 3, lithium chloride group (control rats); 4, the control group (diabetic rats); 5, GSK-3β inhibitor group (diabetic rats); 6, lithium chloride group (diabetic rats).