important research finding on bone metastasis
 

research not yet done on her2positive breast cancer line, though

J Surg Res. 2006 Jan 31; [Epub ahead of print] Related Articles, Links

COX-2 Induces IL-11 Production in Human Breast Cancer Cells.

Singh B, Berry JA, Shoher A, Lucci A.

Department of Surgical Oncology, University of Texas, M.D. Anderson Cancer Center, Houston, Texas.

BACKGROUND: Cyclooxygenase-2 (COX-2) is overexpressed in 40% of human invasive breast cancers. Interleukin-11 (IL-11), a potent mediator of osteoclastogenesis, is involved in breast cancer metastasis to bone. Since breast cancers that overexpress COX-2 are associated with a higher rate of metastasis to bone, we hypothesized that COX-2 expression in tumor cells would induce IL-11. MATERIALS AND METHODS: We transfected MCF-7 (poorly metastatic) and MDA-231 (highly metastatic) human breast cancer cell lines with COX-2 expression vectors. COX-2 overexpression was confirmed by Western blot and PGE(2) immunoassay, and IL-11 production was measured by immunoassay. We also used a nude mouse model to study COX-2 and IL-11 production from breast cancer cells that metastasized to bone. The bone-seeking clones (BSC) were isolated and cultured from the long bone metastases. RESULTS: COX-2 transfection caused an approximately 5- to 6-fold increase in IL-11 production in both MCF-7 and MDA-231 cells. MDA-435S-COX2-BSC (cells isolated from bone metastasis) produced elevated levels of IL-11 and PGE(2) (an important mediator of COX-2) as compared to the parental MDA-435S-COX2 cells. Furthermore, a treatment with low 1- to 2-mum concentration NS-398 or Celecoxib significantly reduced the production of IL-11 in COX-2-transfected MDA-231 cells, thus confirming the involvement of COX-2 in IL-11 induction. CONCLUSION: COX-2-mediated production of IL-11 in breast cancer cells may be vital to the development of osteolytic bone metastases in patients with breast cancer, and a COX-2 inhibitor may be useful in inhibiting this process.

PMID: 16457848 [PubMed - as supplied by publisher]

More links to Cox 2 - which links at least in part back to balancing omega threes and sixes.

RB