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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Poschet, J. F. Boucher, J. C. Tatterson, L. Skidmore, J. Van Dyke, R. W. Deretic, V. |
| Description | Author Affiliation: Poschet JF ( Department of Microbiology and Immunology University of Michigan Medical School, Ann Arbor, MI 48109, USA.); |
| Abstract | The CFTR gene encodes a transmembrane conductance regulator, which is dysfunctional in patients with cystic fibrosis (CF). The mechanism by which defective CFTR (CF transmembrane conductance regulator) leads to undersialylation of plasma membrane glycoconjugates, which in turn promote lung pathology and colonization with Pseudomonas aeruginosa causing lethal bacterial infections in CF, is not known. Here we show by ratiometric imaging with lumenally exposed pH-sensitive green fluorescent protein that dysfunctional CFTR leads to hyperacidification of the trans-Golgi network (TGN) in CF lung epithelial cells. The hyperacidification of TGN, glycosylation defect of plasma membrane glycoconjugates, and increased P. aeruginosa adherence were corrected by incubating CF respiratory epithelial cells with weak bases. Studies with pharmacological agents indicated a role for sodium conductance, modulated by CFTR regulatory function, in determining the pH of TGN. These studies demonstrate the molecular basis for defective glycosylation of lung epithelial cells and bacterial pathogenesis in CF, and suggest a cure by normalizing the pH of intracellular compartments. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 24 |
| Volume Number | 98 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2001-11-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cystic Fibrosis Transmembrane Conductance Regulator Metabolism Cystic Fibrosis Glycoproteins Lung Membrane Proteins Pseudomonas Aeruginosa Acids Bacterial Adhesion Cell Line Glycosylation Green Fluorescent Proteins Luminescent Proteins Membrane Glycoproteins Proton-Translocating ATPases Antagonists & Inhibitors Physiology Recombinant Fusion Proteins Sialyltransferases Sodium-Potassium-Exchanging ATPase Trans-Golgi Network Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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