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Elevated STAT3 expression in ovarian cancer ascites promotes invasion and metastasis: a potential therapeutic target.

Abstract：

:Although activation of the STAT3 pathway has been associated with tumor progression in a wide variety of cancer types (including ovarian cancer), the precise mechanism of invasion and metastasis due to STAT3 are not fully delineated in ovarian cancer. We found that pSTAT3 Tyr705 is constitutively activated in patient ascites and ascites-derived ovarian cancer cells (ADOCCs), and the range of STAT3 expression could be very high to low. In vivo transplantation of ADOCCs with high pSTAT3 expression into the ovarian bursa of mice resulted in a large primary tumor and widespread peritoneal metastases. In contrast, ADOCCs with low STAT3 expression or ADOCCs with STAT3 expression knockdown, led to reduced tumor growth and an absence of metastases in vivo. Cytokines derived from the ADOCC culture medium activate the interleukin (IL)-6/STAT pathway in the STAT3 knockout (KO) cells, compensating for the absence of inherent STAT3 in the cells. Treatment with HO-3867 (a novel STAT3 inhibitor at 100 p.p.m. in an orthotopic murine model) significantly suppressed ovarian tumor growth, angiogenesis and metastasis by targeting STAT3 and its downstream proteins. HO-3867 was found to have cytotoxic effects in ex vivo cultures of freshly collected human ovarian cancers, including those resistant to platinum-based chemotherapy. Our results show that STAT3 is necessary for ovarian tumor progression/metastasis and highlight the potential for targeting STAT3 by HO-3867 as a therapeutic strategy for ovarian cancer.

journal_name

Oncogene

journal_title

Oncogene

authors

Saini U,Naidu S,ElNaggar AC,Bid HK,Wallbillich JJ,Bixel K,Bolyard C,Suarez AA,Kaur B,Kuppusamy P,Hays J,Goodfellow PJ,Cohn DE,Selvendiran K

doi

10.1038/onc.2016.197

subject

Has Abstract

pub_date

2017-01-12 00:00:00

pages

168-181

issue

2

eissn

0950-9232

issn

1476-5594

journal_volume

36

pub_type

杂志文章

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