Abnormal Golgi pH Homeostasis in Cancer Cells Impairs Apical Targeting of Carcinoembryonic Antigen by Inhibiting Its Glycosyl-Phosphatidylinositol Anchor-Mediated Association with Lipid Rafts.

Publisher: Mary Ann Liebert, Inc Country of Publication: United States NLM ID: 100888899 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1557-7716 (Electronic) Linking ISSN: 15230864 NLM ISO Abbreviation: Antioxid Redox Signal Subsets: MEDLINE

Original Publication: Larchmont, NY : Mary Ann Liebert, Inc., 1999-

Homeostasis*; Carcinoembryonic Antigen/*metabolism ; Glycosylphosphatidylinositols/*metabolism ; Golgi Apparatus/*metabolism ; Membrane Microdomains/*metabolism ; Neoplasms/*metabolism ; Neoplasms/*pathology; Animals ; Caco-2 Cells ; Dogs ; Humans ; Hydrogen-Ion Concentration ; Madin Darby Canine Kidney Cells/metabolism

Aims: 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.
Results: Using polarized nontumorigenic Madin-Darby canine kidney (MDCK) cells and CaCo-2 colorectal cancer cells as targets, we show that apical delivery of CEA is not affected by hypoxia, ROS, nor changes in the Golgi redox state. Instead, we find that an elevated Golgi pH induces basolateral targeting of CEA and increases its TX-100 solubility, indicating impaired association of CEA with lipid rafts. Moreover, disruption of lipid rafts by methyl-β-cyclodextrin induced accumulation of the CEA protein at the basolateral surface in MDCK cells. Experiments with the glycosylphosphatidylinositol (GPI)-anchorless CEA mutant and CEA-specific GPI-anchored enhanced green fluorescent protein (EGFP-GPI) fusion protein revealed that the GPI-anchor was critical for the pH-dependent apical delivery of the CEA in MDCK cells. Innovation and Conclusion: The findings indicate that an abnormal Golgi pH homeostasis in cancer cells is an important factor that causes mistargeting of CEA to the basolateral surface of cancer cells via inhibiting its GPI-anchor-mediated association with lipid rafts.

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Keywords: Golgi pH; apical targeting; cancer; carcinoembryonic antigen; hypoxia; lipid rafts; protein trafficking

0 (Carcinoembryonic Antigen)
0 (Glycosylphosphatidylinositols)

Date Created: 20180107 Date Completed: 20200326 Latest Revision: 20200326

20231215

PMC6276271

10.1089/ars.2017.7389

29304557