scholarly journals CFTR Protein: Not Just a Chloride Channel?

Cells ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 2844
Author(s):  
Laurence S. Hanssens ◽  
Jean Duchateau ◽  
Georges J. Casimir
Keyword(s):  
Cystic Fibrosis ◽  
Chloride Channel ◽  
Pancreatic Insufficiency ◽  
Exocrine Pancreatic Insufficiency ◽  
Na Channel ◽  
Ph Homeostasis ◽  
Gene Encoding ◽  
Long Time ◽  
Infection And Inflammation ◽  
Cftr Protein

Cystic fibrosis (CF) is a recessive genetic disease caused by mutations in a gene encoding a protein called Cystic Fibrosis Transmembrane Conductance Regulator (CFTR). The CFTR protein is known to acts as a chloride (Cl−) channel expressed in the exocrine glands of several body systems where it also regulates other ion channels, including the epithelial sodium (Na+) channel (ENaC) that plays a key role in salt absorption. This function is crucial to the osmotic balance of the mucus and its viscosity. However, the pathophysiology of CF is more challenging than a mere dysregulation of epithelial ion transport, mainly resulting in impaired mucociliary clearance (MCC) with consecutive bronchiectasis and in exocrine pancreatic insufficiency. This review shows that the CFTR protein is not just a chloride channel. For a long time, research in CF has focused on abnormal Cl− and Na+ transport. Yet, the CFTR protein also regulates numerous other pathways, such as the transport of HCO3−, glutathione and thiocyanate, immune cells, and the metabolism of lipids. It influences the pH homeostasis of airway surface liquid and thus the MCC as well as innate immunity leading to chronic infection and inflammation, all of which are considered as key pathophysiological characteristics of CF.

scholarly journals 2 The syndrome of exocrine pancreatic insufficiency – cystic fibrosis or other disease?

2012 ◽  
Vol 11 ◽  
pp. S55
Author(s):  
A. Sobczynska-Tomaszewska ◽  
K. Czerska ◽  
A. Szpecht-Potocka ◽  
D. Popielarz ◽  
K. Wertheim-Tysarowska ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Pancreatic Insufficiency ◽  
Exocrine Pancreatic Insufficiency

scholarly journals The Multifaceted Roles of MicroRNAs in Cystic Fibrosis

Diagnostics ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1102
Author(s):  
Fatima Domenica Elisa De Palma ◽  
Valeria Raia ◽  
Guido Kroemer ◽  
Maria Chiara Maiuri
Keyword(s):  
Cystic Fibrosis ◽  
Respiratory Infections ◽  
Current Knowledge ◽  
Pancreatic Insufficiency ◽  
Clinical Manifestations ◽  
Predictive Biomarkers ◽  
Loss Of Function ◽  
Gene Encoding ◽  
Multisystemic Disease

Cystic fibrosis (CF) is a lifelong disorder affecting 1 in 3500 live births worldwide. It is a monogenetic autosomal recessive disease caused by loss-of-function mutations in the gene encoding the chloride channel cystic fibrosis transmembrane conductance regulator (CFTR), the impairment of which leads to ionic disequilibria in exocrine organs. This translates into a chronic multisystemic disease characterized by airway obstruction, respiratory infections, and pancreatic insufficiency as well as hepatobiliary and gastrointestinal dysfunction. Molecular characterization of the mutational heterogeneity of CFTR (affected by more than 2000 variants) improved the understanding and management of CF. However, these CFTR variants are linked to different clinical manifestations and phenotypes, and they affect response to treatments. Expanding evidence suggests that multisystemic disease affects CF pathology via impairing either CFTR or proteins regulated by CFTR. Thus, altering the expression of miRNAs in vivo could constitute an appealing strategy for developing new CF therapies. In this review, we will first describe the pathophysiology and clinical management of CF. Then, we will summarize the current knowledge on altered miRNAs in CF patients, with a focus on the miRNAs involved in the deregulation of CFTR and in the modulation of inflammation. We will highlight recent findings on the potential utility of measuring circulating miRNAs in CF as diagnostic, prognostic, and predictive biomarkers. Finally, we will provide an overview on potential miRNA-based therapeutic approaches.

scholarly journals Efficacy and Safety of a New Formulation of Pancrelipase (Ultrase MT20) in the Treatment of Malabsorption in Exocrine Pancreatic Insufficiency in Cystic Fibrosis

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Michael W. Konstan ◽  
Theodore G. Liou ◽  
Steven D. Strausbaugh ◽  
Richard Ahrens ◽  
Jamshed F. Kanga ◽  
...  
Keyword(s):  
Cystic Fibrosis ◽  
Pancreatic Insufficiency ◽  
Pancreatic Enzyme ◽  
Gastrointestinal Symptoms ◽  
Signs And Symptoms ◽  
Exocrine Pancreatic Insufficiency ◽  
Efficacy And Safety ◽  
Protein Nitrogen ◽  
Enzyme Replacement ◽  
New Formulation

Background. Pancreatic enzyme replacement therapy is the standard of care for treatment of malabsorption in patients with cystic fibrosis (CF) and exocrine pancreatic insufficiency (PI).Aim. To evaluate efficacy and safety of a new formulation of pancrelipase (Ultrase MT20) in patients with CF and PI. Coefficients of fat absorption (CFA%) and nitrogen absorption (CNA%) were the main efficacy parameters. Safety was evaluated by monitoring laboratory analyses, adverse events (AEs), and overall signs and symptoms.Methods. Patients (n=31) were randomized in a crossover design comparing this pancrelipase with placebo during 2 inpatient evaluation periods (6-7 days each). Fat and protein/nitrogen ingestion and excretion were measured from food diaries and 72-hour stool collections. CFA% and CNA% were calculated for each period and compared.Results. Twenty-four patients provided analyzable data. This pancrelipase increased mean CFA% and CNA% (+34.7% and +25.7%, resp.,P<.0001for both), reduced stool frequency, and improved stool consistency compared with placebo. Placebo-treated patients reported more AEs, with gastrointestinal symptoms being the most frequently reported AE.Conclusions. This pancrelipase is a safe and effective treatment for malabsorption associated with exocrine PI in patients with CF.

Detection and follow up of exocrine pancreatic insufficiency in cystic fibrosis: a review

2000 ◽  
Vol 159 (8) ◽  
pp. 563-568 ◽  
Author(s):  
Jasmine Leus ◽  
St&#x000E9;phanie Van Biervliet ◽  
Eddy Robberecht
Keyword(s):  
Cystic Fibrosis ◽  
Pancreatic Insufficiency ◽  
Exocrine Pancreatic Insufficiency
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