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Acetaminophen-induced stimulation of MDR1 expression and activity in rat intestine and in LS 174T human intestinal cell line.

Abstract：

:The well-known analgesic and antipyretic drug N-acetyl-p-aminophenol (acetaminophen; APAP) has been previously reported to affect MDR1 expression in rat liver. In this study, we have investigated the effect of subtoxic doses of APAP on MDR1 expression and activity in rat intestine and human intestinal cells. Administration of APAP at increasing doses of 0.2, 0.3, and 0.6g/kg b.w., i.p. over three consecutive days, induced MDR1 expression in rat duodenum (+240%) and ileum (+160%) as detected by western blotting. This was accompanied by preserved localization of the protein at the surface of the villus, as detected by confocal immunofluorescence microscopy. MDR1 activity was increased by 50% in APAP treated rats, as evaluated by serosal to mucosal secretion of rhodamine 123 in everted intestinal sacs. Treatment with APAP also decreased by 65% the portal vein concentrations of digoxin found in anesthetized rats after intraduodenal administration of this drug, which is consistent with an APAP-induced increased efficacy of intestinal barrier for digoxin net absorption. Exposure of LS 174T human colon adenocarcinoma cells to subtoxic APAP concentration (5mM) induced an increase in MDR1 mRNA expression (+46%), which was accompanied with an enhanced ability (+78%) to reduce intracellular content of rhodamine 123. Taken together these data suggest the existence of APAP-induced stimulation of MDR1 transcription in the intestinal epithelium. These findings are of clinical relevance, as co-administration of APAP with other MDR1 substrates could indirectly inhibit the net intestinal absorption of these drugs, leading to changes in their pharmacokinetics and therapeutic efficacy.

journal_name

Biochem Pharmacol

journal_title

Biochemical pharmacology

authors

Ghanem CI,Arias A,Novak A,Carpini GD,Villanueva S,Blazquez AG,Marin JJ,Mottino AD,Rubio MC

doi

10.1016/j.bcp.2010.10.006

subject

Has Abstract

pub_date

2011-01-15 00:00:00

pages

244-50

issue

2

eissn

0006-2952

issn

1873-2968

pii

S0006-2952(10)00762-8

journal_volume

81

pub_type

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