RT Journal Article ID 568944be26b317a9 A1 Asadi, Farrokh A1 Kukreja, Subhash T1 Parathyroid Hormone-Related Protein in Prostate Cancer JF Critical Reviews™ in Eukaryotic Gene Expression JO CRE YR 2005 FD 2005-03-01 VO 15 IS 1 SP 15 OP 28 AB Although originally discovered as the peptide responsible for humoral hypercalcemia of malignancy (HHM), parathyroid hormone-related protein (PTHrP) has been shown to play a major role in fetal development. In the adult, it is widely distributed in normal and various cancer tissues. In spite of the rarity of HHM in prostate cancer, PTHrP is widely distributed in prostate cancer cells. PTHrP is a precursor molecule with generation of various fragments with distinct biological activities. More recent studies have shown that there is intranuclear localization of PTHrP and that intracrine effects of the peptide are involved in promoting processes that result in tumor progression (cell proliferation, apoptosis, cell attachment and angiogenesis) in prostate cancer. PTHrP expression is controlled by three distinct promoters, with P3 being used most often in cancer cells. The factors that control PTHrP production via interaction with the promoters are growth factors, androgens, vitamin D analogs, and adenoviral proteins. TGF-β and its effector Smad3 activate the P3 promoter through an AGAC box and an Ets binding site involving Ets1 and to some extent Ets2 proteins. In addition, TGF-β stimulates P3 promoter activity via Smad-independent pathways that involve the p38 MAP kinase. Although the addition of PTHrP or transfection with the PTHrP gene in prostate cells results in effects that promote tumor development, studies that employ inhibition of PTHrP activity in vitro and in vivo are needed to establish a definitive role of this peptide in the pathogenesis of prostate cancer. PB Begell House LK https://www.dl.begellhouse.com/journals/6dbf508d3b17c437,03d0336f0e2ce096,568944be26b317a9.html