The results indicated that after oral L dopa the two subtypes (DA 1 and DA 2) of dopamine receptors in rat aorta were down regulated obveriously,but,after a period of down regulation the reaction of dopamine receptors were recoveried a little.

• 结果显示：长期服用左旋多巴后大鼠主动脉平滑肌中多巴胺受体两亚型（DA1，DA2）均显著下调，但一定时间后受体有回升趋势。