Cyclolinopeptide F, a Cyclic Peptide from Flaxseed Inhibited RANKL-induced Osteoclastogenesis Via Downergulation of RANK Expression
Affiliations
Previously, we reported that cyclolinopeptides (CLs) extracted from flaxseed inhibited receptor activator of nuclear factor κ-B ligand (RANKL)-induced osteoclastogenesis from mouse bone marrow cells in vitro. However, mode of action involved in CLs-inhibited osteoclastogenesis has been yet unknown. Therefore, in this study, we investigated the details of inhibitory activity of cyclolinopeptide-F (CL-F) in osteoclastogenesis, as a representative of CLs. CL-F dose-dependently inhibited RANKL-induced osteoclastogenesis (IC 0.58 µM) without cytotoxic effects. The inhibition by CL-F was mainly observed in macrophage colony-stimulating factor (M-CSF)-induced proliferation/differentiation phase from M-CSF responsive immature myeloid cells to monocyte/macrophage (M/Mϕ) lineage. Additionally, CL-F also slightly inhibited RANKL-induced differentiation phase from M/Mϕ to mature osteoclasts. Expression of RANKL receptor, RANK, in M-CSF-induced M/Mϕ, i.e. osteoclast progenitor cells, was decreased by CL-F treatment. Furthermore, RT-PCR analysis revealed that CL-F inhibited c-fos gene expression, which is reported to be crucial for RANK expression in osteoclast progenitor cells induced with M-CSF from myeloid lineage cells. These results suggested that CL-F inhibits osteoclastogenesis via down regulation of c-fos expression, which leads to the down-regulation of RANK expression in M-CSF-induced osteoclast progenitors.
Anticancer Potential of the Cyclolinopeptides.
Fojnica A, Gromilic Z, Vranic S, Murkovic M Cancers (Basel). 2023; 15(15).
PMID: 37568690 PMC: 10416992. DOI: 10.3390/cancers15153874.
Li J, Chen J, Huang P, Cai Z, Zhang N, Wang Y Foods. 2023; 12(12).
PMID: 37372610 PMC: 10297071. DOI: 10.3390/foods12122398.
The Renaissance of Plant Mucilage in Health Promotion and Industrial Applications: A Review.
Dybka-Stepien K, Otlewska A, Gozdz P, Piotrowska M Nutrients. 2021; 13(10).
PMID: 34684354 PMC: 8539170. DOI: 10.3390/nu13103354.
New vasorelaxant indole alkaloids, taberniacins A and B, from Tabernaemontana divaricata.
Hirasawa Y, Dai X, Deguchi J, Hatano S, Sasaki T, Ohtsuka R J Nat Med. 2019; 73(3):627-632.
PMID: 30847757 DOI: 10.1007/s11418-019-01293-9.