Mol. Cells 2004; 18(1): 46-52
Published online January 1, 1970
© The Korean Society for Molecular and Cellular Biology
Aurintricarboxylic acid (ATA) prevents apoptosis in a diverse range of cell types including PC12 cells. It is known to stimulate tyrosine phosphorylation of signaling proteins including Shc proteins, phosphatidylinositol 3-kinase, phospholipase C-g and mitogen-activated protein kinases (MAPKs). However, it has been unclear how ATA increases the phosphorylation of these proteins as it was believed to be membrane impermeable. We found that ATA translocates across the plasma membrane of PC12 cells and have confirmed that it is a potent inhibitor of protein tyrosine phosphatases (PTP ases). Other PTPase inhibitors also prevented apoptosis independent of ATA. These observations indicate that ATA exerts its anti-apoptotic effect on PC12 cells at least in part by inhibiting certain PTPase(s).
Keywords Apoptosis; Aurintricarboxylic Acid; Inhibitor; PC12 Cells; Permeability; Protein Tyrosine Phosphatase
Mol. Cells 2004; 18(1): 46-52
Published online August 31, 2004
Copyright © The Korean Society for Molecular and Cellular Biology.
Hyeongjin Cho, Dong Yoon Lee, Suja Shrestha, Yi Sup Shim, Ki Chul Kim, Mee-Kyung Kim, Keun-Hyeung Lee, Jonghwa Won, Jae-Seung Kang
Aurintricarboxylic acid (ATA) prevents apoptosis in a diverse range of cell types including PC12 cells. It is known to stimulate tyrosine phosphorylation of signaling proteins including Shc proteins, phosphatidylinositol 3-kinase, phospholipase C-g and mitogen-activated protein kinases (MAPKs). However, it has been unclear how ATA increases the phosphorylation of these proteins as it was believed to be membrane impermeable. We found that ATA translocates across the plasma membrane of PC12 cells and have confirmed that it is a potent inhibitor of protein tyrosine phosphatases (PTP ases). Other PTPase inhibitors also prevented apoptosis independent of ATA. These observations indicate that ATA exerts its anti-apoptotic effect on PC12 cells at least in part by inhibiting certain PTPase(s).
Keywords: Apoptosis, Aurintricarboxylic Acid, Inhibitor, PC12 Cells, Permeability, Protein Tyrosine Phosphatase