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Cancer metastasis plays a major role in tumor deterioration. Metastatic processes are known to be regulated by hypoxic microenvironment and non-muscle myosin IIA (NMIIA). DT-13, a bioactive saponin monomer isolated from Ophiopogon japonicus, has been reported to inhibit various cancer metastasis, but whether NMIIA is involved in the anti-metastatic activity of DT-13 under hypoxia remains to be determined. Thus, this study aims to clarify the role of DT-13 in regulating 95D cell metastasis under hypoxic microenvironment and to further investigate whether NMIIA is involved in the anti-metastatic mechanism of DT-13. We found that DT-13 significantly inhibited 95D cells metastasis in vitro and in vivo. Furthermore, hypoxia significantly inhibited the expression of NMIIA and redistributed NMIIA to the cell periphery, whereas DT-13 reversed the hypoxic effects by upregulating the expression of NMIIA. Moreover, DT-13 treatment redistributed NMIIA to the nuclear periphery and reduced the formation of F-actin in 95D cells. In addition, we found that the Raf-ERK1/2 signaling pathway is involved in regulation of NMIIA by DT-13. Collectively, these findings support NMIIA as a target of DT-13 to prevent lung cancer metastasis.

DT-13 attenuates human lung cancer metastasis via regulating NMIIA activity under hypoxia condition