Article ; Online: CFTR, mucins, and mucus obstruction in cystic fibrosis.
Cold Spring Harbor perspectives in medicine
2012 Volume 2, Issue 9, Page(s) a009589
Abstract: Mucus pathology in cystic fibrosis (CF) has been known for as long as the disease has been recognized and is sometimes called mucoviscidosis. The disease is marked by mucus hyperproduction and plugging in many organs, which are usually most fatal in the ... ...
| Abstract | Mucus pathology in cystic fibrosis (CF) has been known for as long as the disease has been recognized and is sometimes called mucoviscidosis. The disease is marked by mucus hyperproduction and plugging in many organs, which are usually most fatal in the airways of CF patients, once the problem of meconium ileus at birth is resolved. After the CF gene, CFTR, was cloned and its protein product identified as a cAMP-regulated Cl(-) channel, causal mechanisms underlying the strong mucus phenotype of the disease became obscure. Here we focus on mucin genes and polymeric mucin glycoproteins, examining their regulation and potential relationships to a dysfunctional cystic fibrosis transmembrane conductance regulator (CFTR). Detailed examination of CFTR expression in organs and different cell types indicates that changes in CFTR expression do not always correlate with the severity of CF disease or mucus accumulation. Thus, the mucus hyperproduction that typifies CF does not appear to be a direct cause of a defective CFTR but, rather, to be a downstream consequence. In organs like the lung, up-regulation of mucin gene expression by inflammation results from chronic infection; however, in other instances and organs, the inflammation may have a non-infectious origin. The mucus plugging phenotype of the β-subunit of the epithelial Na(+) channel (βENaC)-overexpressing mouse is proving to be an archetypal example of this kind of inflammation, with a dehydrated airway surface/concentrated mucus gel apparently providing the inflammatory stimulus. Data indicate that the luminal HCO(3)(-) deficiency recently described for CF epithelia may also provide such a stimulus, perhaps by causing a mal-maturation of mucins as they are released onto luminal surfaces. In any event, the path between CFTR dysfunction and mucus hyperproduction has proven tortuous, and its unraveling continues to offer its own twists and turns, along with fascinating glimpses into biology. |
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| MeSH term(s) | Airway Obstruction ; Animals ; Cystic Fibrosis/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/genetics ; Cystic Fibrosis Transmembrane Conductance Regulator/metabolism ; Disease Models, Animal ; Female ; Gastrointestinal Tract/metabolism ; Gene Expression Regulation/genetics ; Genitalia/metabolism ; Glycoproteins/analysis ; Glycosylation ; Humans ; Lung/metabolism ; Male ; Mice ; Mucin 5AC/genetics ; Mucins/biosynthesis ; Mucins/genetics ; Mucins/metabolism ; Mucus/chemistry ; Mucus/metabolism ; Mucus/physiology ; Pneumonia/metabolism ; RNA, Messenger/metabolism |
| Chemical Substances | Glycoproteins ; MUC5AC protein, human ; Mucin 5AC ; Mucins ; RNA, Messenger ; Cystic Fibrosis Transmembrane Conductance Regulator (126880-72-6) |
| Language | English |
| Publishing date | 2012-09-01 |
| Publishing country | United States |
| Document type | Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't ; Review |
| ISSN | 2157-1422 |
| ISSN (online) | 2157-1422 |
| DOI | 10.1101/cshperspect.a009589 |
| Database | MEDical Literature Analysis and Retrieval System OnLINE |
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