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The effect of inflammation on the in...

Hartmann, Georgy.

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The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice.

Record Type:	Electronic resources : Monograph/item
Title/Author:	The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice./
Author:	Hartmann, Georgy.
Description:	176 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3079.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Health Sciences, Pharmacology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR02641
ISBN:	0494026413

The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice.
Hartmann, Georgy.

The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice. - 176 p.

Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3079.

Thesis (Ph.D.)--University of Toronto (Canada), 2005.

The drug-transporting proteins P-glycoprotein/Multidrug Resistance Protein-1 (PGP/Mdr1/ABCA1) and Multidrug Resistance-Associated Protein-2/Canalicular Multispecific Organic Anion Transporter (Mrp2/cMOAT/ABCC2) play an important role in the disposition of xenobiotics. In the liver, these transporters mediate the efflux of substrates into bile. Acute inflammation is known to suppress the hepatic expression and activity of PGP and Mrp2 in rodents. Using a murine model of endotoxin (LPS)-induced inflammation and Hepal-6 mouse hepatoma cells, we investigated the role of inflammatory cytokines in regulating the expression and activity of hepatic PGP/Mdr1 and Mrp2. Furthermore we delineated the effect of inflammation on the in vivo disposition of the PGP substrate doxorubicin (DOX) in mice. LPS, interleukin (IL)-1beta, IL-6 and tumor necrosis factor (TNF)-alpha were administered in vivo to mice or in vitro to Hepal-6 cells. The expression of Mdr1a, Mdr1b, Mrp2 and the related transporters Mdr2, Mrp1, Mrp3, and the Bile Salt Export Pump (Bsep) was measured using Western blotting and Reverse Transcriptase-Polymerase Chain Reaction. Plasma concentrations of DOX in mice were analyzed by high-performance liquid chromatography.

ISBN: 0494026413Subjects--Topical Terms:

1017717
Health Sciences, Pharmacology.

The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice.
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100 1 $a Hartmann, Georgy. $3 1908513
245 1 4 $a The effect of inflammation on the in vivo expression and activity of P-glycoprotein and multidrug resistance-associated protein-2 in mice.
300 $a 176 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3079.
502 $a Thesis (Ph.D.)--University of Toronto (Canada), 2005.
520 $a The drug-transporting proteins P-glycoprotein/Multidrug Resistance Protein-1 (PGP/Mdr1/ABCA1) and Multidrug Resistance-Associated Protein-2/Canalicular Multispecific Organic Anion Transporter (Mrp2/cMOAT/ABCC2) play an important role in the disposition of xenobiotics. In the liver, these transporters mediate the efflux of substrates into bile. Acute inflammation is known to suppress the hepatic expression and activity of PGP and Mrp2 in rodents. Using a murine model of endotoxin (LPS)-induced inflammation and Hepal-6 mouse hepatoma cells, we investigated the role of inflammatory cytokines in regulating the expression and activity of hepatic PGP/Mdr1 and Mrp2. Furthermore we delineated the effect of inflammation on the in vivo disposition of the PGP substrate doxorubicin (DOX) in mice. LPS, interleukin (IL)-1beta, IL-6 and tumor necrosis factor (TNF)-alpha were administered in vivo to mice or in vitro to Hepal-6 cells. The expression of Mdr1a, Mdr1b, Mrp2 and the related transporters Mdr2, Mrp1, Mrp3, and the Bile Salt Export Pump (Bsep) was measured using Western blotting and Reverse Transcriptase-Polymerase Chain Reaction. Plasma concentrations of DOX in mice were analyzed by high-performance liquid chromatography.
520 $a In vivo, LPS treatment profoundly suppressed the mRNA levels of Mdr1a, Mdr1b, Mrp2, Mrp3 and Bsep to 15--60% of controls (p < 0.05), without significantly altering Mrp1 expression. Likewise, IL-6 administration suppressed Mdr1a, Mdr1b, Mrp2 and Bsep expression to 30--60% of control levels. Similar effects were seen for the levels of Organic Anion Transporting Polypeptides (Oatp) 1 and 2. The suppressive effects of IL-1beta and TNF-alpha on transporter expression were less pronounced, moreover TNF-alpha induced Mdr1b mRNA 6-fold. Significantly lower Mrp2 mRNA levels with a corresponding decrease in cellular efflux of 5-carboxyfluorescein were seen in vitro in cytokine-treated Hepal-6 cells. As compared to controls, LPS-treated mice exhibited 40% decreased biliary excretion, and 3-fold increased renal excretion of DOX, associated with reduced hepatic and increased renal PGP expression. In conclusion, cytokines are key regulators of hepatic PGP and Mrp2 in inflammation. Moreover, inflammation causes PGP expression in the liver and kidney to be differentially regulated, thus altering the clearance profile of DOX.
590 $a School code: 0779.
650 4 $a Health Sciences, Pharmacology. $3 1017717
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710 2 0 $a University of Toronto (Canada). $3 1017674
773 0 $t Dissertation Abstracts International $g 66-06B.
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791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR02641