Inhibition of STAT3 signaling and induction of SHP1 mediate antiangiogenic and antitumor activities of ergosterol peroxide in U266 multiple myeloma cells

BMC Cancer

Kim Sung-Hoon²  Sun-Hee Kim²  Ji Hoon Jung²  Wonil Koh²  Hyo-Jung Lee²  Hyo-Jeong Lee²  Soo-Jin Jeong²  Yun-Hee Rhee¹ 

[1]Clinical Trial Institute, Dankook University, Chenan 330-714, South Korea

[2]College of Oriental Medicine, Kyung Hee University, Seoul 130-701, South Korea

关键词: multiple myeloma;    angiogenesis;    STAT3;    JAK2;    ergosterol peroxide;   

Others  :  1080579
DOI  :  10.1186/1471-2407-12-28

 received in 2011-07-08, accepted in 2012-01-20,  发布年份 2012

【 摘 要 】

Background

Ergosterol peroxide (EP) derived from edible mushroom has been shown to exert anti-tumor activity in several cancer cells. In the present study, anti-angiogenic activity of EP was investigated with the underlying molecular mechanisms in human multiple myeloma U266 cells.

Results

Despite weak cytotoxicity against U266 cells, EP suppressed phosphorylation, DNA binding activity and nuclear translocalization of signal transducer and activator of transcription 3 (STAT3) in U266 cells at nontoxic concentrations. Also, EP inhibited phosphorylation of the upstream kinases Janus kinase 2 (JAK2) and Src in a time-dependent manner. Furthermore, EP increased the expression of protein tyrosine phosphatase SHP-1 at protein and mRNA levels, and conversely silencing of the SHP-1 gene clearly blocked EP-mediated STAT3 inactivation. In addition, EP significantly decreased vascular endothelial growth factor (VEGF), one of STAT3 target genes at cellular and protein levels as well as disrupted in vitro tube formation assay. Moreover, EP significantly suppressed the growth of U266 cells inoculated in female BALB/c athymic nude mice and immunohistochemistry revealed that EP effectively reduced the expression of STAT3 and CD34 in tumor sections compared to untreated control.

Conclusion

These findings suggest that EP can exert antitumor activity in multiple myeloma U266 cells partly with antiangiogenic activity targeting JAK2/STAT3 signaling pathway as a potent cancer preventive agent for treatment of multiple myeloma cells.

【 授权许可】

   
2012 Rhee et al; licensee BioMed Central Ltd.

【 图 表 】

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