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Activation of interleukin-6/signal transducer and activator of transcription 3 by human papillomavirus early proteins 6 induces fibroblast senescence to promote cervical tumourigenesis through autocrine and paracrine pathways in tumour microenvironment

Ren, Chunxia, Cheng, Xi, Lu, Bei, Yang, Gong·2013·European Journal of Cancer
DOI 10.1016/j.ejca.2013.07.140
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Abstract

Although it is reported that interleukin (IL)-6/signal transducer and activator of transcription 3 (STAT3) is activated by human papillomavirus (HPV) infection in cervical cancer cells, little is known about the role of IL-6/STAT3 in tumour microenvironment during development of the disease. In this study, we found that cancer-associated fibroblasts (CAF) but not normal fibroblasts (NF) secrete high level of IL-6 with activated STAT3 and appear senescent at early passages in culture or in cervical cancer tissues infected with high-risk HPV, and that treatment of NF with recombinant IL-6 or CAF conditioned medium (CM) induces activation of STAT3 and cellular senescence. IL-6 and STAT3 are either upregulated or activated in Siha and Hela cells infected with HPV 16 or 18, but not in C33A and ME180 cells without HPV 16 or 18 infection. Overexpression of HPV early proteins 6 (E6) activates STAT3, increases IL-6 expression and tumour burden in C33A and ME180 cells, while silencing of HPV E6 by specific shRNA reduces STAT3 activation, IL-6 expression, and tumour formation in Siha and HeLa cells, so does silencing of STAT3 by specific shRNA in HeLa and C33A/E6 cells. The tumour growth of cervical cancer cells reconstituted with CAF or NF is largely affected by inhibition of fibroblast senescence with STAT3 inhibitor or with IL-6 antibody treatment. Thus, we have uncovered a mechanism that fibroblast senescence promotes cervical cancer development through high-risk HPV E6-activated IL…

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Cited by

Metadata

Authors
Ren, C., Cheng, X., Lu, B., & Yang, G.
Venue
European Journal of Cancer
Publisher
Elsevier BV
Published
2013-12
Volume
49
Issue
18
Pages
3889-3899
ISSN
0959-8049
DOI
10.1016/j.ejca.2013.07.140
Cited by
75
References
6
Language
en
Licence
Funders
National Natural Science Foundation of China (91129721)

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