Linked Life Data

11668039

Source:http://linkedlifedata.com/resource/pubmed/id/11668039

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2001-10-22
pubmed:abstractText
The mechanism of the pancreatic ductal HCO secretion defect in cystic fibrosis (CF) is not well defined. However, a lack of apical Cl(-)/HCO exchange may exist in CF. To test this hypothesis, we examined the expression of Cl(-)/HCO exchangers in cultured pancreatic duct epithelial cells with physiological features prototypical of CF [CFPAC-1 cells lacking a functional CF transmembrane conductance regulator (CFTR)] or normal duct cells (CFPAC-1 cells transfected with functional wild-type CFTR, CFPAC-WT). Cl(-)/HCO exchange activity, assayed with the pH-sensitive dye 2',7'-bis(2-carboxyethyl)-5(6)-carboxyfluorescein in cells grown on coverslips, increased about twofold in cells transfected with functional CFTR. This correlated with increased apical (36)Cl influx in cells expressing functional CFTR and grown on permeable support. Northern hybridizations indicated the induction of downregulated in adenoma (DRA) in cells expressing functional CFTR. The expression of putative anion transporter PAT1 also increased significantly in cells expressing functional CFTR. DRA was detected at high levels in native mouse pancreas by Northern hybridization and localized to the apical domain of the duct cells by immunohistochemical studies. In conclusion, CFTR upregulates DRA and PAT1 expression in cultured pancreatic duct cells. We propose that the pancreatic HCO secretion defect in CF patients is partly due to the downregulation of apical Cl(-)/HCO exchange activity mediated by DRA (and possibly PAT1).
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
http://linkedlifedata.com/resource/pubmed/chemical/Anion Transport Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Antiporters, http://linkedlifedata.com/resource/pubmed/chemical/CFTR protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Carrier Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Chloride-Bicarbonate Antiporters, http://linkedlifedata.com/resource/pubmed/chemical/Cystic Fibrosis Transmembrane..., http://linkedlifedata.com/resource/pubmed/chemical/Membrane Proteins, http://linkedlifedata.com/resource/pubmed/chemical/Membrane Transport Proteins, http://linkedlifedata.com/resource/pubmed/chemical/SLC26A3 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/SLC26A4 protein, human, http://linkedlifedata.com/resource/pubmed/chemical/Slc26a3 protein, mouse
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0193-1857
pubmed:author
pubmed:issnType
Print
pubmed:volume
281
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
G1301-8
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
2001
pubmed:articleTitle
Downregulated in adenoma and putative anion transporter are regulated by CFTR in cultured pancreatic duct cells.
pubmed:affiliation
Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio 45267, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't