Title

Endogenous neurotensin facilitates enterohepatic bile acid circulation by enhancing intestinal uptake in rats

UMMS Affiliation

Department of Cellular and Molecular Physiology; Department of Physiology

Publication Date

11-14-2001

Document Type

Article

Subjects

Anastomosis, Surgical; Animals; Bile; Bile Acids and Salts; Bile Ducts; Chelating Agents; *Enterohepatic Circulation; Fat Emulsions, Intravenous; Gastrointestinal Transit; Intestinal Absorption; Intestines; Ligation; Male; Neurotensin; Rats; Rats, Sprague-Dawley; Sincalide; Taurocholic Acid; Tritium

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Initial studies on the digestive hormone neurotensin (NT) showing that intestinal NT mRNA expression and blood levels were altered in rats fed chow containing bile acid (BA) and the BA chelator cholestyramine led us to investigate the role of NT in the enterohepatic circulation of BA. In fasted, anesthetized rats with common bile ducts cannulated for bile collection, intravenous NT infusion (10 pmol. kg(-1). min(-1)) enhanced BA output relative to control over 3 h in animals administered donor bile into the duodenum (30 microl/min). This suggested that the effect of NT was on the return of BA from the intestine to the liver, which is rate determining in the normal process. In rats prepared as described above and administered [(3)H]taurocholate ([(3)H]TC; 5 mM, 1 ml) duodenally, NT infusion (3-10 pmol x kg(-1) x min(-1)) increased the [(3)H]TC recovery rate in bile approximately twofold, whereas sulfated CCK-8 (12-50 pmol x kg(-1) x min(-1)) had no effect. To investigate the roles of endogenous NT and CCK, we administered [(3)H]TC into the rat duodenum or lower jejunum and tested the effect of the NT antagonist SR-48692 (2 nmol x kg(-1) x min(-1)) or CCK-A antagonist lorglumide (100 nmol x kg(-1) x min(-1)). SR-48692 reduced the [(3)H]TC recovery rate by congruent with 50% and congruent with 24% in the duodenum and jejunum, respectively, whereas lorglumide had no effect. These results suggest that NT or a similar peptide is an endogenous regulator of enterohepatic BA cycling, which acts by enhancing BA uptake in the intestine.

Rights and Permissions

Citation: Am J Physiol Gastrointest Liver Physiol. 2001 Dec;281(6):G1413-22.

Related Resources

Link to article in PubMed

Journal/Book/Conference Title

American journal of physiology. Gastrointestinal and liver physiology

PubMed ID

11705746