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- W2014374003 abstract "Absorption of bile acids by the distal ileum is an essential component of the enterohepatic circulation. In neonatal rats, the appearance of the apical sodium-dependent bile acid transporter (ASBT) at 17 d of age coincides with increases in serum corticosterone and thyroxine. We tested the hypothesis that these hormones modulate ASBT expression during ileal development. Taurocholate uptake into the isolated ileum of normal 20-d-old pups exhibited saturable (K(m) = 0.52 mM, J(max) = 0.34 pmol mg/min) and nonsaturable (K(diff) = 0.015 min(-1)) components and was two to five times greater than uptake in the proximal intestine. Hypothyroid or euthyroid pups received daily thyroxine injections starting at 6 d of age. At 12 d of age, serum concentrations of thyroxine, ileal abundance of ASBT mRNA, and ileal rates of taurocholate uptake were low in hypothyroid pups that received an injection of vehicle (HT-) or thyroxine (HT+) and in euthyroid pups that received an injection of vehicle (ET-) or thyroxine (ET+). At 20 and 26 d, ileal ASBT mRNA abundance and taurocholate uptake rate remained low in HT- pups but increased dramatically in ET- and ET+ pups, paralleling the increase in serum thyroxine. Restoration of normal plasma thyroxine in HT- pups by thyroxine injections (HT+) restored normal ASBT development. Sodium-glucose co-transporter activity and mRNA expression were independent of serum thyroxine levels. Corticosterone levels were significantly lower in pups that were adrenalectomized at 10 d of age. ASBT mRNA abundance and taurocholate uptake rate increased markedly with age but were the same in adrenalectomized, sham-operated, and nonoperated pups. Hence, endogenous thyroxine but not corticosterone regulates the developmentally timed appearance of ASBT." @default.
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- W2014374003 date "2004-04-01" @default.
- W2014374003 modified "2023-10-18" @default.
- W2014374003 title "Ontogenetic Development of Rat Intestinal Bile Acid Transport Requires Thyroxine But Not Corticosterone" @default.
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- W2014374003 doi "https://doi.org/10.1203/01.pdr.0000112126.07230.9a" @default.
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