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An extract from Myracrodruon urundeuva inhibits matrix mineralization in human osteoblasts

Matos, Adriana Arruda, Oliveira, Flávia Amadeu, Machado, Alessandra Cury, Saldanha, Luiz Leonardo, Tokuhara, Cintia Kazuko, Souza, Leonardo Perez, Vilegas, Wagner, Dionísio, Thiago José, Santos, Carlos, Peres-Buzalaf, Camila, Dokkedal, Anne Lígia, Oliveira, Rodrigo
Journal of ethnopharmacology 2019 v.237 pp. 192-201
Astronium urundeuva, alizarin, alkaline phosphatase, ankylosis, bone formation, cytotoxicity, gelatinase A, gene expression, gene expression regulation, leaf extracts, leaves, medicinal plants, mineralization, osteoblasts, oxidative stress, phytotherapy, quantitative polymerase chain reaction, reactive oxygen species, reverse transcriptase polymerase chain reaction, toxicity testing, traditional medicine, viability, Brazil
Phytotherapy based on plant-derived compounds is an alternative medicinal strategy for the relief of symptoms and the curing of diseases. The leaves of Myracrodruon urundeuva a medicinal plant also known as “aroeira”, has been used in traditional medicine as healing, antiulcer and anti-inflammatory to treat skeletal diseases in Brazil, but its role in bone cell toxicity, as well as in bone formation, remains to be established.We sought to determine the in vitro osteogenic effects of a hydroalcoholic M. urundeuva leaves extract in primary human osteoblasts.Cell viability, reactive oxygen species (ROS) production, alkaline phosphatase (ALP) activity and matrix mineralization were evaluated by MTT assay, DCFH-DA probe, colorimetric-based enzymatic assay and Alizarin Red-staining, respectively. Besides, the matrix metalloproteinase (MMP)-2 and progressive ankylosis protein homolog (ANKH) gene expression were determined by real-time RT-qPCR and MMP-2 activity by zymography.Exposure of osteoblasts to M. urundeuva extract significantly decreased viability and increased reactive oxygen species (ROS) production, regardless of the extract concentration. The M. urundeuva extract at 10 μg/mL also downregulated matrix metalloproteinase (MMP)-2, while upregulating progressive ankylosis protein homolog (ANKH) gene expression. By contrast, the MMP-2 activity was unchanged. The M. urundeuva extract at 10 μg/mL also reduced alkaline phosphatase (ALP) activity and mineralization.Overall, our findings suggest that the inhibition of osteogenic differentiation and matrix mineralization promoted by M. urundeuva may be due more to an increase in oxidative stress than to the modulation of MMP-2 and ANKH expression.