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• W4308793209 abstract "Although the gastrointestinal tract (GIT) is an important site for nitrogen metabolism in teleosts, the mechanisms of ammonia absorption and transport remain to be elucidated. Both protein catabolism in the lumen and the metabolism of the GIT tissues produce ammonia which, in part, enters the portal blood through the anterior region of the GIT. The present study examined the possible roles of different GIT sections of rainbow trout (Oncorhynchus mykiss) in transporting ammonia in its unionized gas form—NH3—by changing the PNH3 gradient across GIT epithelia using in vitro gut sac preparations. We also surveyed messenger RNA expression patterns of three of the identified Rh proteins (Rhbg, Rhcg1, and Rhcg2) as potential NH3 transporters and NKCC as a potential ammonium ion (NH4+) transporter along the GIT of rainbow trout. We found that ammonia absorption is not dependent on the PNH3 gradient despite expression of Rhbg and Rhcg2 in the intestinal tissues, and Rhcg2 in the stomach. We detected no expression of Rhbg in the stomach and no expression of Rhcg1 in any GIT tissues. There was also a lack of correlation between ammonia transport and [NH4+] gradient despite NKCC expression in all GIT tissues. Regardless of PNH3 gradients, the stomach showed the greatest absorption and net tissue consumption of ammonia. Overall, our findings suggest nitrogen metabolism zonation of GIT, with stomach serving as an important site for the absorption, handling and transport of ammonia that is independent of the PNH3 gradient." @default.
• W4308793209 created "2022-11-15" @default.
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• W4308793209 date "2022-11-11" @default.
• W4308793209 modified "2023-10-16" @default.
• W4308793209 title "Ammonia transport is independent of PNH ₃ gradients across the gastrointestinal epithelia of the rainbow trout: A role for the stomach" @default.
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• W4308793209 doi "https://doi.org/10.1002/jez.2670" @default.
• W4308793209 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36369634" @default.
• W4308793209 hasPublicationYear "2022" @default.
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