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The role of reduced glutathione in bile formation in sheep

100%

Bobowiec R. , Kosior-Korzecka U. , Martelli F. , Sighieri C.

nr 1

The present study reports the investigation on the influence of reduced glutathione (GSH) on bile secretion in 4 canulated sheep during constant intraduodenal infusion of bile alone, bile with sodium taurocholate (TCHNa) or bile with sodium deoxycholate (DCHNa). Infusions of bile alone and bile with TCHNa or DCHNa brought about an increase in the bile salts secretion from 0.05 ± 0.01 (μM/min/kg to the value of 0.12 ± 0.03, 0.22 ± 0.07 and 0.32 ± 0.08 μM/min/kg, respectively. It was shown that the administration of GSH during the infusion of both bile alone and bile+bile salts slightly but significantly (p < 0.05) lowered bile salts secretion. At the same time both bile with glutathione and bile+bile salts+glutathione increased the bile flow significantly (p < 0.05) as compared to that found after infusions without glutathione. After the i.v. administration of GSH, the volume of the bile increased to a lesser extent than it did with bile+TCHNa or, especially, with bi- le+DCHNa infusions. The concentration of glutathione in the bile was the highest during the infusion of bile+DCHNa (671.18 ng/ml), lower during the infusion of bile+TCHNa (471.40 ng/ml) and the lowest during the infusion of bile alone. Although the bile salts secretion decreased during the simultaneous infusion of the bile with bile salts and glutathione, there was an increase in the bile flow. Therefore, we concluded that some bile acid independent fraction was secreted into the bile and that the fraction was dependent on GSH secretion at the level of canaliculi.

Effects of sodium taurocholate and sodium dehydrocholate on bile flow, lipid and bilirubin secretion in sheep

84%

Bobowiec R. , Studzinski T. , Sikorska M.

nr 7

Bobowiec R., Studziński T. and Sikorska M.: Effects of sodium taurocholate and sodium deyhdrocholate on bile flow and lipid and bilirubin secretion in sheep. Acta Physiol. Pol. The investigation was performed on 8 sheep with implanted catheters in the common bile duct and in the cystic duct. Sodium taurocholate and sodium dehydrocholate were infused into the jugular vein at the rate of 50 µmol/min for 20 min. Directly after the termination of the sodium taurocholate infusion, the volume of the secreted bile increased from 8.4-9 µl· kg⁻¹ · min⁻¹ to the highest mean value of 17.8 µl·kg⁻¹ , min⁻¹ , with a simultaneous increase in the concentration of cholates from 1.71 mmol/1 to 4.82 mmol/1 and bilirubin from 271.1 µmol/1 to 461.7 µmol/1. The concentration of cholesterol and phospholipids in the bile also increased, but did not reach statistically significant values. The infusion of sodium dehydrocholate caused an increase in the bile secretion to the highest mean value of 20.59 µ1 · kg⁻¹ · min⁻¹ with a simultaneous decrease in the concentration of bilirubin to 148.75 µmol/1, cholesterol to 233.0 µg/ml, phospholipids to 56.11 µg/ml and cholate to 1.0 mmol/1. The results show that biliary secretion of phospholipids, cholesterol and bilirubin is dependend on the secretion of sodium taurocholate rather than on dehydrocholic acid.