Abstract
Parathyroid hormone-related protein (PTHrP) is widely expressed in fetal and adult tissues and is a key regulator for cellular calcium transport and smooth muscle cell contractility, as well as a crucial control factor in cell proliferation, development and differentiation. PTHrP stimulates or inhibits apoptosis in an autocrine/paracrine and intracrine fashion, and is particularly important for hair follicle and bone development, mammary epithelial development and tooth eruption. PTHrP’s dysregulated expression has traditionally been associated with oncogenic pathologies as the major causative agent of malignancy-associated hypercalcemia, but recent evidence revealed a driving role in skeletal metastasis progression. Here, we demonstrate that PTHrP is also closely involved in breast cancer initiation, growth and metastasis through mechanisms separate from its bone turnover action, and we suggest that PTHrP as a facilitator of oncogenes would be a novel target for therapeutic purposes.
This study was supported by grants from the Susan G. Komen Foundation (KG 100766) and the Canadian Institutes for Health Research (CIHR MOP 102555) to R. Kremer and AC Karaplis and the US Department of Defense Breast Cancer Research Program (BC023897) to AC Karaplis.
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Kremer, R., Li, J., Camirand, A., Karaplis, A.C. (2011). Parathyroid Hormone Related Protein (PTHrP) in Tumor Progression. In: Rhim, J., Kremer, R. (eds) Human Cell Transformation. Advances in Experimental Medicine and Biology, vol 720. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-0254-1_12
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