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http://dx.doi.org/10.5352/JLS.2015.25.8.947

Prostate Apoptosis Response-4 (Par-4) as a Cancer Therapeutic Target  

Woo, Seon Min (Department of Immunology, School of Medicine, Keimyung University)
Kwon, Taeg Kyu (Department of Immunology, School of Medicine, Keimyung University)
Publication Information
Journal of Life Science / v.25, no.8, 2015 , pp. 947-952 More about this Journal
Abstract
Prostate apoptosis response-4 (Par-4) was originally identified in androgen-independent prostate cancer cells undergoing apoptosis. Par-4 is ubiquitously expressed in normal cells and tissues, but it is downregulated in several types of cancers. Par-4 is a 38 kDa tumor suppressor protein encoded by the PARW gene. Par-4 promotes apoptosis in a variety of cancerous cells, but not in normal cells. In this review, we focused on the structure, expression and function of Par-4 in apoptotic signaling pathway. Functional domains of Par-4 include two nuclear localization sequences (NLS), a leucine zipper (LZ) domain, a nuclear export sequence (NES) and selective for apoptosis in cancer cell (SAC) domain. Many studies have underlined the importance of Par-4 in preventing cancer development. The activity of Par-4 is differently regulated by localization of intracellular and extracellular Par-4. Intracellular Par-4 inhibits Akt- and NF-κB-mediated cell survival pathways and downregulates Bcl-2 expression. Extracellular Par-4 activates the extrinsic apoptotic pathway by binding to cell surface receptor GRP78, a stress response protein that is in the endoplasmic reticulum (ER). Endogenous Par-4 sensitizes cancer cells to various apoptotic stimuli, while exogenous Par-4 enhances SAC domain-dependent apoptosis in cancer cells, but not normal cells. Therefore, Par-4 is an attractive target for cancer therapy.
Keywords
Apoptosis; cancer; prostate apoptosis response-4 (Par-4); nuclear factor-κ B (NF-κ B); selective for apoptosis in cancer cell (SAC) domain;
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