Rat cholangiocytes absorb bile acids at their apical domain via the ileal sodium-dependent bile acid transporter

Konstantinos N Lazaridis, Linh Pham, Pam Tietz, Raul A. Marinelli, Piet C. DeGroen, Susan Levine, Paul A. Dawson, Nicholas F La Russo

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

Although bile acid transport by bile duct epithelial cells, or cholangiocytes, has been postulated, the details of this process remain unclear. Thus, we performed transport studies with [3H]taurocholate in confluent polarized monolayers of normal rat cholangiocytes (NRC). We observed unidirectional (i.e., apical to basolateral) Na+-dependent transcellular transport of [3H]taurocholate. Kinetic studies in purified vesicles derived from the apical domain of NRC disclosed saturable Na+ - dependent uptake of [3H]taurocholate, with apparent K(m) and V(max) values of 209 ± 45 μM and 1.23 ± 0.14 nmol/mg/10 s, respectively. Reverse transcriptase PCR (RTPCR) using degenerate primers for both the rat liver Na+ dependent taurocholate-cotransporting polypeptide and rat ileal apical. Na+ -dependent bile acid transporter, designated Ntcp and ASBT, respectively, revealed a 206-bp product in NRC whose sequence was identical to the ASBT. Northern blot analysis demonstrated that the size of the ASBT transcript was identical in NRC, freshly isolated cholangiocytes, and terminal lieum. In situ RT-PCR on normal rat liver showed that the message for ASBT was present only in cholangiocytes. Immunoblots using a well- characterized antibody for the ASBT demonstrated a 48-kD protein present only in apical membranes. Indirect immunohistochemistry revealed apical localization of ASBT in cholangiocytes in normal rat liver. The data provide direct evidence that conjugated bile acids are taken up at the apical domain of cholangiocytes via the ASBT, and are consistent with the notion that cholangiocyte physiology may be directly influenced by bile acids.

Original languageEnglish (US)
Pages (from-to)2714-2721
Number of pages8
JournalJournal of Clinical Investigation
Volume100
Issue number11
StatePublished - Dec 1 1997

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Bile Acids and Salts
Taurocholic Acid
Liver
Transcytosis
sodium-bile acid cotransporter
Bile Ducts
Reverse Transcriptase Polymerase Chain Reaction
Northern Blotting
Epithelial Cells
Immunohistochemistry
Polymerase Chain Reaction
Peptides
Membranes
Antibodies
Proteins

Keywords

  • Biliary epithelia
  • Plasma membrane vesicles
  • Taurocholate
  • Transport liver

ASJC Scopus subject areas

  • Medicine(all)

Cite this

Rat cholangiocytes absorb bile acids at their apical domain via the ileal sodium-dependent bile acid transporter. / Lazaridis, Konstantinos N; Pham, Linh; Tietz, Pam; Marinelli, Raul A.; DeGroen, Piet C.; Levine, Susan; Dawson, Paul A.; La Russo, Nicholas F.

In: Journal of Clinical Investigation, Vol. 100, No. 11, 01.12.1997, p. 2714-2721.

Research output: Contribution to journalArticle

Lazaridis, Konstantinos N ; Pham, Linh ; Tietz, Pam ; Marinelli, Raul A. ; DeGroen, Piet C. ; Levine, Susan ; Dawson, Paul A. ; La Russo, Nicholas F. / Rat cholangiocytes absorb bile acids at their apical domain via the ileal sodium-dependent bile acid transporter. In: Journal of Clinical Investigation. 1997 ; Vol. 100, No. 11. pp. 2714-2721.
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AU - Pham, Linh

AU - Tietz, Pam

AU - Marinelli, Raul A.

AU - DeGroen, Piet C.

AU - Levine, Susan

AU - Dawson, Paul A.

AU - La Russo, Nicholas F

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