Increased Sulfation of Glycoconjugates by Cultured Nasal Epithelial Cells from Patients with Cystic Fibrosis
Overview
Affiliations
Cystic fibrosis (CF) respiratory epithelia exhibit abnormal anion transport that may be linked to abnormal lung defense. In these studies, we investigated whether primary cultures of CF respiratory epithelial cells regulate abnormally the sulfate content of high molecular weight glycoconjugates (HMG) participating in airways' mucosal defense. HMG, including glycosaminoglycans and mucin-type glycoproteins released spontaneously into medium and HMG released from cell surfaces by trypsin, were metabolically labeled with 35SO4- and [6-3H]-glucosamine (GlcN) or 35SO4- and [3H]serine. All three classes of HMG from CF cells exhibited 35S/3H labeling ratios 1.5-4-fold greater than HMG from normal or disease control cells. Differences for labeling ratios of HMG from CF cells were shown to be the consequence of increased 35SO4- incorporation rather than decreased peptide synthesis and release or HMG glycosylation. The buoyant density of CF mucin-type HMG also was increased, consistent with increased sulfation. These observations suggest that oversulfation of a spectrum of HMG is a genetically determined characteristic of CF epithelial cells and may play an important pathophysiological role by altering the properties of mucous secretions and/or the interactions between selected bacteria and HMG at the airways' surface.
Acquired dysfunction of CFTR underlies cystic fibrosis-like disease of the canine gallbladder.
Gookin J, Holmes J, Clarke L, Stauffer S, Meredith B, Vandewege M Am J Physiol Gastrointest Liver Physiol. 2024; 327(4):G513-G530.
PMID: 39041675 PMC: 11482251. DOI: 10.1152/ajpgi.00145.2024.
The Alterations and Roles of Glycosaminoglycans in Human Diseases.
Wang Q, Chi L Polymers (Basel). 2022; 14(22).
PMID: 36433141 PMC: 9694910. DOI: 10.3390/polym14225014.
Targeting of Glycosaminoglycans in Genetic and Inflammatory Airway Disease.
Caird R, Williamson M, Yusuf A, Gogoi D, Casey M, McElvaney N Int J Mol Sci. 2022; 23(12).
PMID: 35742845 PMC: 9224208. DOI: 10.3390/ijms23126400.
Molecular Mechanisms of and Interactions in Cystic Fibrosis.
Biswas L, Gotz F Front Cell Infect Microbiol. 2022; 11:824042.
PMID: 35071057 PMC: 8770549. DOI: 10.3389/fcimb.2021.824042.
Physicochemical properties of mucus and their impact on transmucosal drug delivery.
Leal J, Smyth H, Ghosh D Int J Pharm. 2017; 532(1):555-572.
PMID: 28917986 PMC: 5744044. DOI: 10.1016/j.ijpharm.2017.09.018.