... by increased Na + /K + -ATPase activity, and possibly enhanced proton pump activity, and was facilitated by the apical epithelial Na + channel (ENaC) and/or the apical Na + /H + exchanger (NHE2), both of which are expressed in the urodaeum. NHE3 was expressed at very low levels in the urodaeum and probably...

... in the anal papillae suggests that, in addition to AeAmt1, the ionomotive pumps V-type H + -ATPase and Na + /K + -ATPase as well as NHE3 are involved in ammonia excretion at the anal papillae. * Author for correspondence ( [email protected] ) Competing interests The authors declare no competing...

... to the apical crypt of ionocytes in seawater-acclimated individuals, whereas sodium/hydrogen exchanger 3 (NHE3) labeling was present on the apical surface of ionocytes in both acclimation groups. Ionocytes were concentrated on the trailing edge of the gill filament, evenly distributed along the proximal 75...

... + exchanger 3 (NHE3), vacuolar-type H + -ATPase (VHA) and anion exchanger pendrin (PDN) would be upregulated in freshwater (FW) C. leucas . Immunohistochemistry was used to localise all four ion transporters in gills of bull sharks captured in both FW and estuarine/seawater (EST/SW) environments. NHE3...

... environmental ammonia (HEA; 1 and 5 mmol l –1 NH 4 HCO 3 ) and evaluated the patterns of ammonia excretion and gill Rh mRNA and protein expression. Gill H + -ATPase , NHE1 , NHE2 , NHE3 , Na + /K + -ATPase ( NKA ), Na + /K + /2Cl – co-transporter ( NKCC1 ) mRNA, H + -ATPase activity, NKA protein and activity...

...G. Ivanis; A. J. Esbaugh; S. F. Perry SUMMARY Experiments were conducted on adult rainbow trout ( Oncorhynchus mykiss ) to test the hypothesis that SLC9 Na + /H + exchangers (SLC9A2, NHE2; and SLC9A3, NHE3) on the gill epithelium are localized specifically to a subset of mitochondria-rich cells...