The 32kDa dopamine and cyclic adenosine 3',5'-monophosphate-regulated phosphoprotein (DARPP-32) can either function as a serine/threonine kinase or as a serine/threonine phosphatase depending upon which particular amino acid residue is phosphorylated (1). When phosphorylated by protein kinase A (PKA) at threonine 34, DARPP-32 becomes a potent inhibitor of protein phosphatase-1 (2-3). Alternatively, when phosphorylated at threonine 75 by cyclin-dependent kinase 5(Cdk5), DARPP-32 is converted into an inhibitor of PKA (1). DARPP-32 and truncated DARPP (t-DARPP) are overexpressed in gastric cancers (4).
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