Mechanism underlying the interventional effect of panax notoginsenosides on ovariectomized osteoporotic fracture rats / 中国组织工程研究

ABSTRACT

BACKGROUND: Osteoporotic fractures are the most common serious complications caused by osteoporosis, and their repair is more difficult, which seriously threatens the health and quality of life of patients. OBJECTIVE: To investigate the interventional effect of Panax Notoginsenosides in ovariectomized osteoporotic fracture rats and the relevant mechanism. METHODS: Fifty healthy female rats were selected. Ten of them were normal group, and the other 40 rats were used to make ovariectomized osteoporotic fracture models. Model rats were divided into model group, low, medium and high dose group. Normal group and model group rats were intragastrically administered normal saline, rats in the low, medium and high dose group were given intragastric administration of 10, 20 and 40 mg/kg Panax Notoginsenosides solution. The study protocol was approved by the Animal Ethic Committee of the First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, No. (2019)58 on September 23, 2019. RESULTS AND CONCLUSION: The bone mineral density and bone cell index of the high dose group were higher than those of low and middle dose groups (P < 0.05). The bone volume fraction, the number of callus trabeculae and the thickness of trabeculae in the high dose group were all higher than those in the model group, the low dose group and the middle dose group, and the resolution of trabeculae was lower than that in these three groups (P < 0.05). The levels of glutathione peroxidase, bone morphogenetic protein 2, and vascular endothelial growth factor in the high dose group were lower than those in the normal group, but higher than those in the model group, low and medium dose groups. The levels of lipid peroxide, malondialdehyde, osteocalcin, type I procollagen carboxy terminal propeptide, bone-specific alkaline phosphatase in the high dose group were higher than those in the normal group, but lower than those in the model group, low and medium dose group (P < 0.05). The expression of PI3K, Akt and mTOR in the low, middle and high dose groups was lower than that in the normal group and higher than that in the model group; and the expression of PI3K, Akt and mTOR in the high dose group was higher than that in the low and middle dose groups (P < 0.05). Therefore, treatment with Panax Notoginsenosides can increase the bone miner density and bone cell index, promote the growth of bone trabecula at the callus, alleviate oxidative stress injury, regulate the PI3K / Akt / mTOR signal pathway, and accelerate the formation of new blood vessels in the callus and fracture healing in ovariectomized osteoporotic fracture rats.