in gh4c1 rat pituitary cells , 1,25-dihydroxycholecalciferol ( 1,25 ( oh ) 2d3 ) causes amplification of both the trh-induced spike phase in cytosolic free calcium [ ( ca2+ ] i ) and the increase in [ ca2+ ] i induced by depolarization with k+ .
C0007634
cells
C1383501
cytosolic