The D dopamine receptor exists in two alternatively spliced isoforms, ``long'' and ``short'' (D and D), which differ by 29 amino acids in the third cytoplasmic domain. The functional differences between these two isoforms are still obscure. We have performed pulse-chase studies on the D and D receptors expressed in CHO cells in order to follow the post-translational processing of the two isoforms. Both isoforms are present in three post-translational states: a newly synthesized protein, a partially glycosylated product, and a fully glycosylated mature 70-kDa receptor. However, the processing to the mature receptor differs between the two isoforms. First, the D receptor is processed to the mature 70-kDa species faster than the D receptor. Second, at 20 °C the D isoform is fully processed to the 70-kDa species, whereas the D isoform persists in its partially processed 45-kDa state. Finally, a significant portion of the D receptor remains in its partially processed form in an intracellular compartment and does not reach the plasma membrane. These results give rise to the suggestion that the difference observed between the two alternatively spliced isoforms of the D receptor may lie in their post-translational processing and intracellular trafficking.

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