Aquaporins are membrane proteins that facilitate the transmembrane movement of water. several aquaporins are present in placenta. several aquaporins are present in placenta. in the human, aqp8 is present in chorioamnion ( 96 ) and placenta and aqp3 and aqp9 are found in microvillous membrane, where they may contribute not only to its water but also perhaps to urea, purine, and pyrimidine permeability ( 97 ).. Aquaporin-1 (aqp1) is found in the blood vessels, kidney proximal tubules, eye, and ear. aquaporin-2 (aqp2) is expressed in the kidney collecting ducts, where it shuttles between the intracellular storage sites and the plasma membrane under the control of antidiuretic hormone (adh)..
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