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Abnormal Golgi pH Homeostasis in Cancer Cells Impairs Apical Targeting of Carcinoembryonic Antigen by Inhibiting Its Glycosyl-Phosphatidylinositol Anchor-Mediated Association with Lipid Rafts
Author(s) -
Nina Kokkonen,
Elham Khosrowabadi,
Antti Hassinen,
Déborah Harrus,
Tuomo Glumoff,
Thomas Kietzmann,
Sakari Kellokumpu
Publication year - 2018
Publication title -
antioxidants and redox signaling
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.277
H-Index - 190
eISSN - 1557-7716
pISSN - 1523-0864
DOI - 10.1089/ars.2017.7389
Subject(s) - lipid raft , golgi apparatus , microbiology and biotechnology , chemistry , epithelial polarity , cancer cell , carcinoembryonic antigen , biology , biochemistry , cell , cancer , signal transduction , genetics
Carcinoembryonic antigen (CEACAM5, CEA) is a known tumor marker for colorectal cancer that localizes in a polarized manner to the apical surface in normal colon epithelial cells whereas in cancer cells it is present at both the apical and basolateral surfaces of the cells. Since the Golgi apparatus sorts and transports most proteins to these cell surface domains, we set out here to investigate whether any of the factors commonly associated with tumorigenesis, including hypoxia, generation of reactive oxygen species (ROS), altered redox homeostasis, or an altered Golgi pH, are responsible for mistargeting of CEA to the basolateral surface in cancer cells.

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