Kupffer cell-mediated down regulation of rat hepatic CMOAT/MRP2 gene expression.

Abstract:

:Lipopolysaccharides (LPS) induces intrahepatic cholestasis and canalicular multispecific organic anion transporter (CMOAT/MRP2) plays a central role in hepatic bilirubin transport. This study examined the role of Kupffer cell in LPS-induced cholestasis. Rats were injected intravenously with LPS. Kupffer cells were inactivated with gadolinium chloride (Gd). CMOAT/MRP2 mRNA expression was time- and dose-dependently decreased by LPS injection with a decrease in bile flow and an increase in serum bilirubin level. Gd pretreatment inhibited decrease in CMOAT/MRP2 mRNA and bile flow, and increase in serum bilirubin. Kupffer cell-conditioned medium decreased CMOAT/MRP2 expression. Addition of anti-IL-1 or anti-TNFalpha antibody restored CMOAT/MRP2 expression, whereas IL-1 and TNFalpha decreased the expression. MAP kinases were activated by addition of the conditioned medium, and addition of PD98059 or SB203580 restored CMOAT/MRP2 expression. These results suggest that LPS activates Kupffer cells to secrete IL-1 and TNFalpha, which in turn activate MAP kinases and decrease CMOAT/MRP2 expression.

authors

Nakamura J,Nishida T,Hayashi K,Kawada N,Ueshima S,Sugiyama Y,Ito T,Sobue K,Matsuda H

doi

10.1006/bbrc.1999.0160

subject

Has Abstract

pub_date

1999-02-05 00:00:00

pages

143-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X99901602

journal_volume

255

pub_type

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