Background: Portulaca oleracea (PO) has been widely used as traditional medicine because of its pharmacological activities. However, the effects of PO on osteoclasts that modulate bone homeostasis are still elusive. Methods: In this study, we examined the effects of PO ethanol extract (POEE) on receptor activator of nuclear factor-kB ligand (RANKL)-mediated Ca2+ mobilization, nuclear factor of activated T-cell c1 (NFATc1) amplification, tartrate-resistant acid phosphatase-positive (TRAP+) multinucleated cell (MNC) formation, and cytotoxicity. Results: Our results demonstrated that POEE suppressed RANKL-induced Ca2+ oscillations by inhibition of Ca2+ release from internal Ca2+ stores, resulting in reduction of NFATc1 amplification. Notably, POEE attenuated RANKL-mediated cytotoxicity and cleavage of polyadenosine 5'-diphosphate-ribose polymerase (PARP), resulted in enhanced formation of TRAP+ MNCs. Conclusions: These results present in vitro effects of POEE on RANKL-mediated osteoclastogenesis and suggest the possible use of PO in treating bone disorders, such as osteopetrosis.
CITATION STYLE
Erkhembaatar, M., Choi, E. J., Lee, H. Y., Lee, C. H., Lee, Y. R., & Kim, M. S. (2015). Attenuated RANKL-induced cytotoxicity by Portulaca oleracea ethanol extract enhances RANKL-mediated osteoclastogenesis. BMC Complementary and Alternative Medicine, 15(1). https://doi.org/10.1186/s12906-015-0770-9
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