D2-like dopamine receptors are not detectable on human peripheral blood lymphocytes

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      The binding of [3H]-nemonapride to human peripheral blood lymphocytes (PBL) was studied using various competing ligands specific for D2-like dopamine receptors. There is no detectable stereoselectivity for the stereoisomers of butaclamol, and competitions with haloperidol and sulpiride also show no evidence of specific binding to D2-like dopamine receptors. RT-PCR of RNA from human lymphocytes showed that there is no detectable D2 mRNA (even with nested PCR). D3 mRNA was, however, detectable by RT-PCR, but only at low levels that could not be detected by Northern blots of PBL total RNA.

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