Research in Experimental Medicine

, Volume 197, Issue 3, pp 125–135 | Cite as

Impairment of hepatic transport processes in perfused rat liver by the specific CCK receptor antagonist loxiglumide

  • Karlheinz Beckh
  • Anja Dirks
  • Irmtraut Koop
  • Herbert Koop
  • Guido Adler
Article
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Abstract

The specific cholecystokinin (CCK) receptor antagonist loxiglumide has been used in several human and animal studies to investigate the role of CCK in gastrointestinal physiology. In the present study, the interference of this CCK receptor antagonist with hepatic transport processes was characterized in the perfused rat liver. Indocyanine green, an organic dye which is secreted into bile without being metabolized, was taken up in control experiments at a rate of 68.1 ± 7.7%. The CCK receptor antagonist lowered the extraction to 0.5 ± 2.6% (P < 0.001). The compound diminished the hepatic extraction of CCK-8 from 90.95 ± 2.60% to 4.90 ± 1.95% (P < 0.001) and of gastrin from 22.2 ± 1.1% to 8.2 ± 1.9% (P < 0.001). The hepatic extraction of lidocaine, which is metabolized by the cytochrome P450 system, was only slightly altered. For leukotrienes and taurocholate, the rate-limiting step for transport into bile is secretion across the canalicular membrane; the hepatic extraction of leukotriene D4 was markedly diminished by loxiglumide whereas the transport of taurocholate was only slightly inhibited. The present study demonstrates that the specific CCK receptor antagonist loxiglumide diminished the hepatic extraction of various substances, including peptides and organic anions. It did not interfere with the cytochrome P450 system. The pronounced reduction of hepatic uptake of indocyanine green and leukotriene may be due to an interference with the transport system of these substances in the liver.

Key words

Cholecystokinin Gastrin Lidocaine Indocyanine green Leukotriene 
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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Karlheinz Beckh
    • 1
    • 3
  • Anja Dirks
    • 4
  • Irmtraut Koop
    • 2
    • 4
  • Herbert Koop
    • 2
    • 5
  • Guido Adler
    • 1
  1. 1.Department of Internal Medicine, Division of Gastroenterology and EndocrinologyUniversity of UlmUlmGermany
  2. 2.Department of Internal Medicine, Division of Gastroenterology and MetabolismPhilipps-UniversityMarburgGermany
  3. 3.Department of Internal MedicineCity HospitalWormsGermany
  4. 4.Department of Internal MedicineHumboldt-University CharitéBerlinGermany
  5. 5.Department of Internal MedicineHospital Berlin-BuchBerlinGermany

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