Abstract
Two-thirds of newly diagnosed hormone-dependent (HR+) breast cancers are detected in post-menopausal patients where estrone-3-sulphate (E3S) is the predominant source for tumour estradiol. Understanding intra-tumoral fate of E3S would facilitate in the identification of novel molecular targets for HR + post-menopausal breast cancer patients. Hence this study investigates the clinical expression of (i) organic anion-transporting polypeptides (OATPs), (ii) multidrug resistance protein (MRP-1), breast cancer resistance proteins (BCRP), and (iii) sulphatase (STS), 17β-hydroxysteroid dehydrogenase (17β-HSD-1), involved in E3S uptake, efflux and metabolism, respectively. Fluorescent and brightfield images of stained tumour sections (n = 40) were acquired at 4× and 20× magnification, respectively. Marker densities were measured as the total area of positive signal divided by the surface area of the tumour section analysed and was reported as % area (ImageJ software). Tumour, stroma and non-tumour tissue areas were also quantified (Inform software), and the ratio of optical intensity per histologic area was reported as % area/tumour, % area/stroma and % area/non-tumour. Functional role of OATPs and STS was further investigated in HR+ (MCF-7, T47-D, ZR-75) and HR-(MDA-MB-231) cells by transport studies conducted in the presence or absence of specific inhibitors. Amongst all the transporters and enzymes, OATPs and STS have significantly (p < 0.0001) higher expression in HR+ tumour sections with highest target signals obtained from the tumour regions of the tissues. Specific OATP-mediated E3S uptake and STS-mediated metabolism were also observed in all HR+ breast cancer cells. These observations suggest the potential of OATPs as novel molecular targets for HR+ breast cancers.
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Acknowledgment
The authors acknowledge Dr. Md. Tozammel Hoque for his help with the cell line transient transfection studies and Dr. Fei–Fei Liu for her excellent scientific advice and for serving as the Principal Investigator on the Research Ethics Board (REB) Tissue application. This research was supported by Internal University of Toronto funds allocated to Dr. Reina Bendayan and Dr. Christine Allen. Nilasha Banerjee is a recipient of the CIHR- Bio-Therapeutics Strategic Training doctoral fellowship and the Canadian Breast Cancer Foundation-Ontario region doctoral fellowship.
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Banerjee, N., Miller, N., Allen, C. et al. Expression of membrane transporters and metabolic enzymes involved in estrone-3-sulphate disposition in human breast tumour tissues. Breast Cancer Res Treat 145, 647–661 (2014). https://doi.org/10.1007/s10549-014-2990-y
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DOI: https://doi.org/10.1007/s10549-014-2990-y