编者按：本周Science登出这篇文章，立意很简单，作者观察到三类不同的药物：多巴胺能激动剂 (such as D-amphetamine), serotonergic agonists (such as LSD),和谷氨酸能拮抗剂(such as PCP)能在动物和人身上表现出相似的症状（如癫痫综合征），因此推测它们可能作用机制（信号通路）是相似的或相同的，并因此找到它们三个物质共同作用靶蛋白：DARPP-32，解释了其中的机理。这个idea并不难，但却很巧，值得我们深思。
Diverse Psychotomimetics Act Through a Common Signaling Pathway
Science Nov 21 2003: 1412-1415.
Per Svenningsson,1 Eleni T. Tzavara,2 Robert Carruthers,1 Ilan Rachleff,1 Sigrid Wattler,3 Michael Nehls,3 David L. McKinzie,2 Allen A. Fienberg,1,4 George G. Nomikos,2 Paul Greengard1*
Three distinct classes of drugs: dopaminergic agonists (such as D-amphetamine), serotonergic agonists (such as LSD), and glutamatergic antagonists (such as PCP) all induce psychotomimetic states in experimental animals that closely resemble schizophrenia symptoms in humans. Here we implicate a common signaling pathway in mediating these effects. In this pathway, dopamine- and an adenosine 3',5'-monophosphate (cAMP)–regulated phospho-protein of 32 kilodaltons (DARPP-32) is phosphorylated or dephosphorylated at three sites, in a pattern predicted to cause a synergistic inhibition of protein phosphatase–1 and concomitant regulation of its downstream effector proteins glycogen synthesis kinase–3 (GSK-3), cAMP response element–binding protein (CREB), and c-Fos. In mice with a genetic deletion of DARPP-32 or with point mutations in phosphorylation sites of DARPP-32, the effects of D-amphetamine, LSD, and PCP on two behavioral parameters—sensorimotor gating and repetitive movements—were strongly attenuated.
1 Laboratory of Molecular and Cellular Neuroscience, The Rockefeller University, New York, NY 10021, USA.
2 Eli Lilly and Company, Lilly Corporate Center, Neuroscience Discovery Research, Indianapolis, IN 46285–0510, USA.
3 Lexicon Genetics Inc., The Woodlands, TX 77381–1160, USA.
4 Intra-Cellular Therapies Inc., Audubon Biomedical Science and Technology Park, New York, NY 10032, USA.
* To whom correspondence should be addressed. E-mail: greengd@mail.rockefeller.edu
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