Effects of strontium ranelate on ligature‐induced periodontitis in estrogen‐deficient and estrogen‐sufficient rats

• Published in: Journal of periodontal research 2020-01, Vol.55 (1), p.141-151
• Main Authors: Marins, Letícia Macedo, Napimoga, Marcelo Henrique, Malta, Fernando de Souza, Miranda, Tamires Szeremeske, Nani, Edson Parra, Franco, Beatriz da Silva Tavares, Silva, Hélio Doyle Pereira, Duarte, Poliana Mendes
• Format: Article
• Language: English
• Subjects: Acid phosphatase (tartrate-resistant); Alveolar bone; alveolar bone loss; Alveolar Bone Loss - drug therapy; Animals; Biological activity; Bone loss; Cancellous bone; Dentistry; Estrogens - deficiency; Gum disease; Hormone replacement therapy; Mandible; Osteocalcin; Osteocalcin - metabolism; Osteopontin; Osteopontin - metabolism; Osteoporosis; Osteoprotegerin; Osteoprotegerin - metabolism; Ovariectomy; Periodontitis; Periodontitis - drug therapy; RANK ligand; RANK Ligand - metabolism; Rats; Rats, Wistar; Strontium; strontium ranelate; Surgery; Teeth; Thiophenes - pharmacology; TRANCE protein
• ISSN: 0022-3484; 1600-0765
• DOI: 10.1111/jre.12697

Background and objectives Strontium ranelate is a medication indicated for the treatment of osteoporosis that presents concomitant anti‐resorptive and osteoanabolic dual biological activity. However, the effects of strontium ranelate on alveolar bone have been poorly explored. Furthermore, to date, there are no data on the effects of this medication on alveolar bone loss (BL) during conditions of estrogen deficiency. Therefore, the aim of this study was to evaluate the effects of strontium ranelate on ligature‐induced periodontitis in estrogen‐deficient and estrogen‐sufficient rats. Methods Ninety‐six rats were assigned to one of the following groups: sham‐surgery + water (estrogen‐sufficient; n = 24); ovariectomy + water (estrogen‐deficient; n = 24), sham‐surgery + strontium ranelate (ranelate/estrogen‐sufficient; n = 24) and; ovariectomy + strontium ranelate (ranelate/estrogen‐deficient; n = 24). The rats received strontium ranelate or water from the 14th day after ovariectomy until the end of the experiment. On the 21st day after ovariectomy, one first mandibular molar received a ligature, while the contralateral tooth was left unligated. Eight rats per group were killed at 10, 20, and 30 days after ligature placement. Bone loss (BL) and trabecular bone area (TBA) were analyzed in the furcation area of ligated and unligated teeth at all experimental times by histometry. Tartrate‐resistant acid phosphatase (TRAP) positive cells and immunohistochemical staining for osteocalcin (OCN), osteopontin (OPN), osteoprotegerin (OPG), and receptor activator of NF‐КB ligand (RANKL) were assessed in the ligated teeth at 30 days after ligature placement. Results At 10 and 30 days, ligated teeth of the estrogen‐deficient group exhibited higher BL, when compared to all other groups (P