Increased activity of Pgp multidrug transporter in patients with Helicobacter pylori infection.

Abstract:

AIM:To determine whether local antibiotic resistance involves P-glycoprotein (Pgp)-mediated active drug out-pumping during Helicobacter pylori (H pylori) infection treatment with classic antibiotic therapy. METHODS:Pgp activity was determined in gastric mucosa biopsy specimens obtained from 53 patients with pathohistologically verified gastritis and microbiologically confirmed H pylori infection, and compared with the Pgp activity in 12 control subjects with normal endoscopic findings. The H pylori positive patients were treated with short-term 7-d therapy consisting of two antibiotics (amoxicillin and azithromycin/metronidazole and clarithromycin) and a proton pump inhibitor. Pgp activity was determined by flow cytometry in the test of rhodamine dye efflux and quantified as mean fluorescence ratio (RMF). RESULTS:Upon the first cycle, H pylori was successfully eradicated in 20 patients, whereas therapy was continued in 33 patients. In the course of antibiotic therapy, RMF increased (P<0.05) and gastric cells showed higher rhodamine dye efflux. The mean pre-treatment RMF values were also higher (P<0.0001) in patients with multiple therapeutic failure than in those with successful H pylori eradication and control subjects. CONCLUSION:Pgp might be one of the causes of therapy failure in patients with H pylori and antibiotic therapy could be chosen and followed up on the basis of the Pgp transporter local activity.

journal_name

World J Gastroenterol

authors

Babic Z,Svoboda-Beusan I,Kucisec-Tepes N,Dekaris D,Troskot R

doi

10.3748/wjg.v11.i18.2720

keywords:

subject

Has Abstract

pub_date

2005-05-14 00:00:00

pages

2720-5

issue

18

eissn

1007-9327

issn

2219-2840

journal_volume

11

pub_type

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