support for this conclusion was , first , that the uptake of other ions , potassium ( k+ ) and rubidium ( rb+ ) , with tight-junctional permeabilities greater than na+ , was also stimulated by calcitriol , and second , perturbation of cellular na+ and k+ fluxes by inhibition of na+/k+-atpase activity did not affect calcitriol-stimulated na+ , k+ , or rb+ transport .
C0242358
tight-junctional
C0007634
cellular