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Digoxin attenuates bisphosphonate related osteonecrosis of the jaws by RORγt-dependent Th17 response in male rats. | LitMetric

Digoxin attenuates bisphosphonate related osteonecrosis of the jaws by RORγt-dependent Th17 response in male rats.

Oral Surg Oral Med Oral Pathol Oral Radiol

Department of Dentistry, Laboratory of Oral Pathology, Unichristus, Fortaleza, Ceará, Brazil; Department of Clinical Dentistry, Division of Oral Pathology, School of Pharmacy, Dentistry and Nursing, Universidade Federal do Ceará, Fortaleza, Ceará, Brazil; Department and Laboratory of Molecular Biology and Genetics of the Instituto do Câncer do Ceará, Fortaleza, Ceará, Brazil. Electronic address:

Published: December 2024

AI Article Synopsis

Article Abstract

Objective: The study aimed to evaluate digoxin, an RORγt inhibitor, in Medication-Related Osteonecrosis of the Jaws (MRONJ) in male rats treated with zoledronic acid (ZA).

Study Design: Forty male Wistar rats were divided into a negative control group (0.1 mL/kg saline), a positive control group (ZA, 0.20 mg/kg), and three test groups treated with ZA and digoxin at 1 (DG1), 2 (DG2), or 4 (DG4) mg/kg. These groups received treatment three times weekly. ZA was administered intravenously on days 0, 7, and 14, followed by extraction of the left lower first molar on day 42, a final ZA dose on day 49, and euthanasia on day 70. Analyses included radiographic, histomorphometric, and immunohistochemical evaluation of the mandibles, western blotting of gingiva, and mechanical tests on femurs. Statistical analysis was performed using ANOVA/Bonferroni tests (P < .05).

Results: Digoxin reduced radiolucency of MRONJ (P < .001), inflammatory cells, empty osteocyte lacunae (P < .001), apoptotic osteoclasts (P < .001), and Caspase-3-positive osteocytes (P = .021). ZA increased immunoreactivity for most markers except c-Fos, while digoxin reduced interleukin 17, TNF-α, IL-6, IL-2, FOXP3, c-Jun, NFκB (P < .001), TGF-β (P = .009), RANKL (P = .035), and OPG (P = .034). Digoxin also reversed RORγt expression (P < .001), increased diarrhea scores (P = .028), renal and cardiac indexes (P < .001), and enhanced femur mechanical properties (P < .013).

Conclusions: Digoxin attenuated MRONJ by inhibiting RORγt and reducing the Th17 response.

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Source
http://dx.doi.org/10.1016/j.oooo.2024.08.013DOI Listing

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