Remodelação óssea durante o reparo alveolar é prejudicada por antagonista da RANKL

Autores

DOI:

https://doi.org/10.33448/rsd-v10i1.11975

Palavras-chave:

Osteoporose; Remodelação óssea; Densidade óssea; Alvéolo dental; Denosumab.

Resumo

A osteoporose pós menopáusica é prejudicial ao metabolismo ósseo, bem como ao reparo alveolar. Essa desordem osteometabólica é um obstáculo para o sucesso das reabilitações maxilofaciais, visto que uma grande parcela dos pacientes são portadores da doença. O Denosumab é amplamente utilizado como tratamento da osteoporose pós menopáusica. Esse medicamento exerce ação antireabsortiva pela inibição do RANKL, auxiliando na diminuição da perda óssea provocada pela osteoporose.  Este estudo teve como objetivo a avaliação do osso reparacional formado após a exodontia do incisivo superior de ratas com deficiência de estrógeno tratadas com o anticorpo monoclonal anti-RANKL. As ratas (Rattus novergicus albinus, Wistar) foram ovariectomizadas ou SHAM operadas (n=36). Metade das ratas ovariectomizadas receberam tratamento com osteoprotegerina com um fragmento Fc (OPG-Fc; 10mg/kg, duas vezes por semana), o restante das ratas recebeu solução salina como controle. Após 30 dias as ratas tiveram o incisivo superior direito extraído. Decorridos 60 dias da exodontia, os alvéolos foram avaliados por imunoistoquímica, microtomografia computadorizada e microscopia confocal. A OPG-Fc diminuiu a porcentagem de volume ósseo (BV/TV), espessura (Tb.Th) o número das trabéculas (Tb.N) alveolares quando em comparação aos grupos que receberam solução salina (p<0,005). A OPG-Fc aumentou a separação entre as trabéculas (Tb.Sp) e a porosidade (Po.tot) do osso alveolar reparacional (p<0,005). A OPG-Fc diminuiu a imunomarcação para RANKL e TRAP quando comparada aos grupos que receberam solução salina. O tratamento com OPG-Fc diminuiu a neoformação óssea, mas preservou o tecido ósseo preexistente. Esse dado é suportado pela taxa de aposição mineral, que apresentou valores maiores para OVX/OPG-Fc quando comparado ao grupo OVX.

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24/01/2021

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SILVA, A. C. E. da .; BATISTA, F. R. de S. .; MOURA, J. de .; COLÉTE, J. Z. .; CHIBA, F. .; GOMES-FERREIRA, P. H. S. .; OKAMOTO, R. . Remodelação óssea durante o reparo alveolar é prejudicada por antagonista da RANKL. Research, Society and Development, [S. l.], v. 10, n. 1, p. e43710111975, 2021. DOI: 10.33448/rsd-v10i1.11975. Disponível em: https://rsdjournal.org/index.php/rsd/article/view/11975. Acesso em: 23 nov. 2024.

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Ciências da Saúde