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Summary
Neonatal biliary physiology matures with age, showing decreased chloride and bicarbonate but increased sodium and bile acids in gallbladder bile. Bile flow and bile acid transport mechanisms mature by 28-42 days of age in puppies.
Area of Science:
- Physiology
- Neonatal Physiology
- Biliary Physiology
Background:
- Understanding the ontogeny of neonatal biliary physiology is crucial for assessing liver function in newborns.
- Biliary composition and flow dynamics undergo significant changes from birth through early life.
Purpose of the Study:
- To investigate the developmental changes in gallbladder bile composition, hepatic bile flow, and composition in puppies of varying ages.
- To determine the choleretic effects of specific bile acids and hormones in neonatal and adult dogs.
Main Methods:
- Gallbladder bile and hepatic bile composition and flow were measured in anesthetized puppies (0-3, 7-21, 28-42 days) and adult dogs (fed and fasted).
- Choleretic effects of taurocholate, taurodehydrocholate, secretin, and glucagon were assessed.
- Bile-to-plasma ratio of 14C-erythritol was used to evaluate bile flow.
Main Results:
- Gallbladder bile showed decreasing chloride and bicarbonate concentrations with age, while sodium and bile acid concentrations increased.
- Spontaneous bile flow rate increased significantly with age, reaching adult levels by 28-42 days.
- Choleretic activity of taurocholate and taurodehydrocholate was similar between puppies and adult dogs, with high bile acid excretion.
Conclusions:
- Neonatal biliary physiology undergoes significant maturation, characterized by changes in bile composition and increased bile flow.
- Key components of bile acid transport and choleretic responses are established early in postnatal development.