Abstract:
:Bone is maintained by an intricate balance between bone formation and bone resorption. The presence of inflammation can contribute to an imbalance in bone homeostasis by enhancing differentiation and activity of osteoclasts, the cells that participate in the breakdown of bone. Polyphenols such as flavonoids found in plant-derived foods have been shown to have anti-inflammatory effects in various tissues. Tart cherries are a rich source of such polyphenolic compounds. Using mouse macrophage cells (RAW 264.7), we examined whether tart cherry polyphenols could dose dependently inhibit the proliferation and activity of receptor activator of nuclear factor kappa-B ligand (RANKL) differentiated osteoclasts under inflammatory conditions. Tartrate-resistant acid phosphatase (TRAP) activity and staining of TRAP-positive multinucleated cells, used as indicators of osteoclast differentiation and activity, tended to decrease with tart cherry polyphenols treatment. Osteoprotegerin expression by osteoclasts was decreased in a similar manner. A significant increase in nitrite concentration was observed with the lower doses of tart cherry polyphenols of 50 and 100 μg/mL (P < .05). However, higher doses of tart cherry polyphenols (200 and 300 μg/mL) reduced nitrite concentrations below that of the control that received no tart cherry polyphenols treatment (P < .05). Western blot analyses showed that protein expression of cyclooxygenase-2 (COX-2) followed a similar trend, although results were not statistically significant. On the other hand, tart cherry polyphenols treatments dose dependently increased inducible nitric oxide synthase protein expression, with statistical significance noted at doses of 200 and 300 μg/mL. Overall, our findings suggest that the polyphenols associated with tart cherries potentially inhibit osteoclast differentiation and activity, which may be beneficial to bone health.
journal_name
J Med Foodjournal_title
Journal of medicinal foodauthors
Thomas A,South S,Vijayagopal P,Juma Sdoi
10.1089/jmf.2019.0050subject
Has Abstractpub_date
2020-01-01 00:00:00pages
56-64issue
1eissn
1096-620Xissn
1557-7600journal_volume
23pub_type
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