Antibiotic accumulation and membrane trafficking in cystic fibrosis cells

Abstract

Cystic fibrosis (CF) results from mutations in the gene encoding the CF transmembrane conductance regulator (CFTR) which is a regulated chloride channel. The ΔF508 mutation prevents the post-translational glycosylation and membrane insertion of the protein. Severe disease follows, with the formation of a viscous mucus and subsequent chronic bacterial infection of the lungs, necessitating frequent, and often long, periods of antibiotic treatment. The pharmacokinetics of antibiotics in CF patients are abnormal, with lower blood serum levels and higher clearance rates which have never been satisfactorily explained. We found that accumulation of gentamicin in nasal polyp tissue non-CF cells was subject to regulation by the effecters and inhibitors of CFTR function; regulation was lost in ΔF508 CF cells and accumulation was more than doubled because of the inhibition of exocytosis.