Mall, Marcus and Kreda, Silvia M. and Mengos, April and Jensen, Timothy J. and Hirtz, Stephanie and Seydewitz, Hans H. and Yankaskas, James and Kunzelmann, Karl and Riordan, John R. and Boucher, Richard C. (2004) The Delta F508 mutation results in loss of CFTR function and mature protein in native human colon. GASTROENTEROLOGY, 126 (1). pp. 32-41. ISSN 0016-5085
Full text not available from this repository.Abstract
Background & Aims: Deletion of the codon for phenylalanine at position 508 (DeltaF508) is the most frequent disease-causing mutation in the cystic fibrosis transmembrane conductance regulator (CFTR) gene. In heterologous cells, defective processing of the DeltaF508 protein results in endoplasmic reticulum retention, proteolytic degradation, and absence of adenosine 3',5'cyclic monophosphate (cAMP)-dependent plasma membrane Cl- conductance. However, data with respect to the processing block of DeltaF508 protein in native epithelia are limited and conflicting. Metho : To characterize both the fate and function of DeltaF508 protein in a native epithelium, we measured CFTR-mediated Cl- secretion, localization of the CFTR protein, and CFTR maturation in rectal biopsy specimens from normal individuals and DeltaF508 homozygous patients with cystic fibrosis (CF). Results: Ussing chamber studies showed that cAMP-dependent and cholinergic Cl- secretion was absent from rectal tissues freshly excised from DeltaF508 homozygous patients with CF. By immunohistochemistry, we detected wild-type but not DeltaF508 CFTR at the luminal membrane of crypt colonocytes. By sequential immuno-precipitation and immunoblotting analyses, mature CFTR protein was detected in normal but not in DeltaF508 homozygous tissues. Conclusions: Collectively, these data show that there is insufficient maturation and transport of DeltaF508 CFTR from the endoplasmic reticulum to the apical membrane to support CFTR-mediated Cl- secretion in the CF colon.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSMEMBRANE CONDUCTANCE REGULATOR; CYSTIC-FIBROSIS MUTATION; CHLORIDE CHANNEL; TRANSPORT ABNORMALITIES; HOMOZYGOUS TWINS; WILD-TYPE; EXPRESSION; LOCALIZATION; SECRETION; MECHANISMS; |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Physiologie > Prof. Dr. Karl Kunzelmann |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Aug 2021 08:28 |
| Last Modified: | 04 Aug 2021 08:28 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38162 |
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