Heparan sulfate proteoglycans and human breast cancer epithelial cell tumorigenicity

Okolicsanyi, Rachel K., van Wijnen, Andre J., Cool, Simon M., Stein, Gary S., Griffiths, Lyn R., & Haupt, Larisa M. (2014) Heparan sulfate proteoglycans and human breast cancer epithelial cell tumorigenicity. Journal of Cellular Biochemistry, 115(5), pp. 967-976.

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Abstract

Heparan sulfate proteoglycans (HSPGs) are key components of the extracellular matrix that mediate cell proliferation, invasion, and cellular signaling. The biological functions of HSPGs are linked to their co-stimulatory effects on extracellular ligands (e.g., WNTs) and the resulting activation of transcription factors that control mammalian development but also associated with tumorigenesis. We examined the expression profile of HSPG core protein syndecans (SDC1–4) and glypicans (GPC1–6) along with the enzymes that initiate or modify their glycosaminoglycan chains in human breast cancer (HBC) epithelial cells. Gene expression in relation to cell proliferation was examined in the HBC cell lines MCF-7 and MDA-MB-231 following treatment with the HS agonist heparin. Heparin increased gene expression of chain initiation and modification enzymes including EXT1 and NDST1, as well as core proteins SDC2 and GPC6. With HS/Wnt interactions established, we next investigated WNT pathway components and observed that increased proliferation of the more invasive MDA-MB-231 cells is associated with activation of the Wnt signaling pathway. Specifically, there was substantial upregulation (>5-fold) of AXIN1, WNT4A, and MYC in MDA-MB-231 but not in MCF-7 cells. The changes in gene expression observed for HSPG core proteins and related enzymes along with the associated Wnt signaling components suggest coordinated interactions. The influence of HSPGs on cellular proliferation and invasive potential of breast cancer epithelial cells are cell and niche specific. Further studies on the interactions between HSPGs and WNT ligands may yield clinically relevant molecular targets, as well as new biomarkers for characterization of breast cancer progression.

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ID Code: 69151
Item Type: Journal Article
Refereed: Yes
Keywords: HEPARAN SULFATE PROTEOGLYCANS, BREAST CANCER, MCF‐7, MDA‐MB‐231, GENE EXPRESSION, Wnt SIGNALING
DOI: 10.1002/jcb.24746
ISSN: 0730-2312
Subjects: Australian and New Zealand Standard Research Classification > BIOLOGICAL SCIENCES (060000) > BIOCHEMISTRY AND CELL BIOLOGY (060100) > Cell Development Proliferation and Death (060103)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Copyright Owner: Copyright 2014 Wiley Periodicals, Inc.
Deposited On: 25 Mar 2014 23:27
Last Modified: 22 Mar 2016 03:57

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