tokens: In rats exposed to Cd for 30 d , the levels of urinary excretion of cAMP after treatment with parathyroid hormone ( PTH ) , parathyroidectomy ( PTX ) , or 1 alpha - hydroxycholecalciferol ( 1 alpha - OH - D3 ) showed almost the same patterns as those of control rats : the response of urinary cAMP to treatment with PTH was not influenced by continuous oral administration of Cd .