HISTOLOGY AND HISTOPATHOLOGY

From Cell Biology to Tissue Engineering

 

Puerarin and zinc additively prevent mandibular bone loss through inhibiting osteoclastogenesis in ovariectomized rats

Hao Liu1,3,4, Wei Li2,3,4, Shengnan Jia2,3,4 and Binbin Li2,3,4

1The Core Laboratory, 2Department of Oral Pathology, Peking University School and Hospital of Stomatology, 3National Engineering Laboratory for Digital and Material Technology of Stomatology and 4Beijing Key Laboratory of Digital Stomatology, Beijing , China

Offprint requests to: Dr. Binbin Li, Department of Oral Pathology, Peking University School and Hospital of Stomatology, 22 Zhongguancun South Avenue, Haidian District, Beijing 100081, China. e-mail: kqlibinbin@aliyun.com


Summary. Puerarin and zinc play a key role in preventing osteoporotic-related bone loss. Previous research on puerarin or zinc mainly focused on the anti-osteoporotic effects of long bone. However, it is obscure for puerarin or zinc to prevent mandibular osteoporosis. Here, we explore the effects on additive coadminis-tration of puerarin and zinc on preventing mandibular bone loss in ovariectomized rats, and evaluate the underlying mechanisms ex vivo. Rats were ovariecto-mized and administrated puerarin, zinc or both. After 12 weeks, bone mineral density (BMD) and histomorpho-metry of mandibles were measured by micro-CT. The mechanical properties were determined using a three-point bending test. Then, osteogenic differentiation of primary bone marrow stromal cells (BMSCs) and osteoclastogenesis of bone marrow mononuclear were performed ex vivo. The culture supernatant and serum level of bone biochemical markers including osteoprotegerin (OPG), osteopontin (OPN), receptor activator of nuclear factor (NF)-κB ligand (RANKL), and tartrate-resistant acid phosphatase (TRAP) were detected by ELISA. Culture supernatant and serum levels of calcium were measured using a Plasma Emission Spectrometer. One-way ANOVA was used for statistical analyses. The results showed that administration of puerarin plus zinc prevented the decrease in mandibular BMD and bone morphometrical parameters more effectively than single use of puerarin or zinc (p<0.05), which was similar to the biomechanical tests (p<0.05). Furthermore, puerarin and zinc additively up-regulated OPG, OPN protein levels, Ca ion level and down-regulated RANKL, TRAP protein levels. In conclusion, puerarin and zinc additively prevent mandibular bone loss through inhibiting osteoclasto-genesis in ovariectomized rats, which will shed more light on the potential use of puerarin and zinc in the prevention/treatment of oral bone loss clinically. Histol Histopathol 32, 851-860 (2017)

Key words: Puerarin, Zinc, Mandible, Osteoporosis, Osteoclastogenesis

DOI: 10.14670/HH-11-855