The Effects of Some Phosphodiesterase 5 Inhibitors on Oxidative Stress, VEGF, BMP 2 and 9 in the Liver Tissue of Ovariectomized Rats

INTRODUCTION: Osteoporosis is an important health problem and there is no effective treatment yet. phosphodiesterase 5 inhibitors are promising agents for the treatment of osteoporosis. In this study, we aimed to determine the effects of phosphodiesterase 5 inhibitors (vardenafil, tadalafil, and udenafil) on bone morphogenic protein-2 and 9 (BMP-2 and 9), vascular endothelial growth factor (VEGF), and oxidative stress markers (malondialdehyde and CoQ10) in liver tissue of rats with ovariectomy-induced osteoporosis. METHODS: 50 Albino wistar female rats were randomly divided into 5 groups of 10 rats per group. Groups were the sham-operated, ovariectomise (OVEX), OVEX + Tadalafil, OVEX + udenafil and OVEX + vardenafil, respectively. VEGF, BMP-2 and 9 levels were measured by ELISA kits. To detect levels of MDA and CoQ10, we used high pressure liquid chromatography method. RESULTS: The levels of VEGF, BMP-2 and 9 levels in the groups that applied PDE-5 inhibitors were significantly higher than in the sham and OVEX groups. There was no significant difference between the OVEX+vardenafil and OVEX+udenafil groups in terms of VEGF, BMP-2 and 9 levels. The levels of MDA and CoQ10 were significantly lower in the groups that applied PDE5 inhibitors than in the OVEX group. When the histological and immunohistochemical results were examined, it was seen that angiogenesis was significantly higher in PDE-5 inhibitor groups. DISCUSSION AND CONCLUSION: In conclusion, we can say that these inhibitors may have positi ve effects on bone mineralization and remodelling by inducing the expression of VEGF, BMP-2 and 9 in liver tissue.