PLAC8 localizes to the inner plasma membrane of pancreatic cancer cells and regulates cell growth and disease progression through critical cell-cycle regulatory pathways

• Verfasst von: Kaistha, Brajesh Pratap [VerfasserIn]
• Verfasst von: Lorenz, Holger [VerfasserIn]
• Verfasst von: Schmidt, Harald [VerfasserIn]
• Verfasst von: Sipos, Bence [VerfasserIn]
• Verfasst von: Pawlak, Michael [VerfasserIn]
• Verfasst von: Gierke, Berthold [VerfasserIn]
• Verfasst von: Kreider, Ramona [VerfasserIn]
• Verfasst von: Lankat-Buttgereit, Brigitte [VerfasserIn]
• Verfasst von: Sauer, Melanie [VerfasserIn]
• Verfasst von: Fiedler, Lisa [VerfasserIn]
• Verfasst von: Krattenmacher, Anja [VerfasserIn]
• Verfasst von: Geisel, Bettina [VerfasserIn]
• Verfasst von: Kraus, Johann M. [VerfasserIn]
• Verfasst von: Frese, Kristopher K. [VerfasserIn]
• Verfasst von: Kelkenberg, Sabine [VerfasserIn]
• Verfasst von: Giese, Nathalia [VerfasserIn]
• Verfasst von: Kestler, Hans A. [VerfasserIn]
• Verfasst von: Gress, Thomas M. [VerfasserIn]
• Verfasst von: Buchholz, Malte [VerfasserIn]
• Titel: PLAC8 localizes to the inner plasma membrane of pancreatic cancer cells and regulates cell growth and disease progression through critical cell-cycle regulatory pathways
• Verf.angabe: Brajesh P. Kaistha, Holger Lorenz, Harald Schmidt, Bence Sipos, Michael Pawlak, Berthold Gierke, Ramona Kreider, Brigitte Lankat-Buttgereit, Melanie Sauer, Lisa Fiedler, Anja Krattenmacher, Bettina Geisel, Johann M. Kraus, Kristopher K. Frese, Sabine Kelkenberg, Nathalia A. Giese, Hans A. Kestler, Thomas M. Gress, and Malte Buchholz
• E-Jahr: 2016
• Jahr: [2016]
• Jahr des Originals: 2015
• Umfang: 12 S.
• Illustrationen: Illustrationen
• Fussnoten: Published online first December 15, 2015 ; Gesehen am 07.05.2020
• Titel Quelle: Enthalten in: Cancer research
• Ort Quelle: Philadelphia, Pa. : AACR, 1916
• Jahr Quelle: 2016
• Band/Heft Quelle: 76(2016), 1, Seite 96-107
• ISSN Quelle: 1538-7445
• DOI: doi:10.1158/0008-5472.CAN-15-0216
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1697636888

Abstract

Pancreatic ductal adenocarcinoma (PDAC) carries the most dismal prognosis of all solid tumors and is generally strongly resistant to currently available chemo- and/or radiotherapy regimens, including targeted molecular therapies. Therefore, unraveling the molecular mechanisms underlying the aggressive behavior of pancreatic cancer is a necessary prerequisite for the development of novel therapeutic approaches. We previously identified the protein placenta-specific 8 (PLAC8, onzin) in a genome-wide search for target genes associated with pancreatic tumor progression and demonstrated that PLAC8 is strongly ectopically expressed in advanced preneoplastic lesions and invasive human PDAC. However, the molecular function of PLAC8 remained unclear, and accumulating evidence suggested its role is highly dependent on cellular and physiologic context. Here, we demonstrate that in contrast to other cellular systems, PLAC8 protein localizes to the inner face of the plasma membrane in pancreatic cancer cells, where it interacts with specific membranous structures in a temporally and spatially stable manner. Inhibition of PLAC8 expression strongly inhibited pancreatic cancer cell growth by attenuating cell-cycle progression, which was associated with transcriptional and/or posttranslational modification of the central cell-cycle regulators CDKN1A, retinoblastoma protein, and cyclin D1 (CCND1), but did not impact autophagy. Moreover, Plac8 deficiency significantly inhibited tumor formation in genetically engineered mouse models of pancreatic cancer. Together, our findings establish PLAC8 as a central mediator of tumor progression in PDAC and as a promising candidate gene for diagnostic and therapeutic targeting. Cancer Res; 76(1); 96-107. ©2015 AACR.