The sodium-bicarbonate cotransporter NBCe2 (slc4a5) expressed in human renal proximal tubules shows increased apical expression under high-salt conditions.
Gildea JJ, Xu P, Carlson JM, Gaglione RT, Bigler Wang D, Kemp BA, Reyes CM, McGrath HE, Carey RM, Jose PA, et al. Am J Physiol Regul Integr Comp Physiol. 2015 Dec 1; 309(11):R1447-59. Epub 2015 Oct 7.