Abstract:
:The expression of oncostatin M and leukemia inhibitory factor (LIF), JAK-STAT activators and members of the interleukin-6 family of cytokines, were examined in a series of primary ovarian carcinomas using immunohistochemistry. The malignant epithelial cells of all 29 ovarian carcinomas examined expressed oncostatin M; none expressed LIF. Oncostatin M can activate two related receptors, one consisting of a low-affinity LIF receptor subunit, LIFR beta, which forms a heterocomplex with the gp130 signal transducing protein and can recognize both oncostatin M and LIF, and a second heterocomplex consisting of a subunit that specifically recognizes oncostatin M, OSMR beta, and the gp130 protein. By immunohistochemistry, 25 of 25 ovarian carcinomas examined expressed the LIFR beta subunit in the malignant epithelial cells (all samples express gp130), and two-thirds the ovarian carcinomas studied expressed OSMR beta mRNA as determined by RT-PCR. Thus oncostatin M and its receptors are commonly coexpressed in malignant ovarian epithelial cells, and represent a potential autocrine loop in this tumor type. STAT3, of one the signaling proteins downstream of the oncostatin M/LIF receptors, was found in its phosphorylated, activated form (phosphotyrosine 705 STAT3) in the malignant epithelial cells of 17 of 23 ovarian carcinomas examined (74%) as determined by immunohistochemistry; this suggests that this protein is constitutively activated in most ovarian carcinomas, as it is in many other human malignancies. Recombinant human Oncostatin M (rhOSM) can induce the transient tyrosine 705 phosphorylation of STAT3 in serum-starved LIFR beta/OSMR beta expressing ovarian carcinoma cell lines, but does not alter cell growth and effects only a modest increase in the apoptotic rate in these cultured cells. Oncostatin M and its receptors may be part of a network of cytokine systems within ovarian carcinomas that may act to maintain STAT3 in its activated form, a phenomenon associated with the malignant phenotype.
journal_name
Cytokinejournal_title
Cytokineauthors
Savarese TM,Campbell CL,McQuain C,Mitchell K,Guardiani R,Quesenberry PJ,Nelson BEdoi
10.1006/cyto.2002.1022keywords:
subject
Has Abstractpub_date
2002-03-21 00:00:00pages
324-34issue
6eissn
1043-4666issn
1096-0023pii
S1043466602910227journal_volume
17pub_type
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