Severe depletion of cocaine recognition sites associated with the dopamine transporter in Parkinson's-diseased striatum

Synapse. 1991 Sep;9(1):43-9. doi: 10.1002/syn.890090107.


The cocaine congener [3H]CFT, also designated [3H]WIN 35,428 (2 beta-carbomethoxy-3 beta-(4-fluorophenyltropane), labels cocaine receptors associated with the dopamine transporter in primate striatum. Autoradiographic distribution of [3H]CFT binding (5 nM) in human postmortem control and Parkinson's-diseased striatal tissue sections was compared. In control tissue, high and comparable levels of [3H]CFT binding were observed in the putamen and caudate nucleus. At least 90-99% of total [3H]CFT bound was inhibited by (-)-cocaine (30 microM), suggesting that a high proportion of [3H]CFT is specifically bound. In Parkinson's-diseased tissue, binding sites for [3H]CFT were reduced by 80% in the caudate nucleus and 96% in the putamen. This pattern of depletion parallels the previously reported loss of dopamine in these brain regions (Kish, Shannak, and Hornykiewicz, New Engl. J. Med., 318:876-880, 1988). In the dorsal caudate nucleus of Parkinson's-diseased tissue, a lateral-to-medial gradient of [3H]CFT binding was observed, with the lateral caudate more severely depleted than the medial caudate. The marked decrease of [3H]CFT binding sites in Parkinson's diseased striatum supports the following conclusions: 1) the dopamine transporter is localized primarily on presynaptic nigrostriatal terminals; 2) in the caudate and putamen, cocaine recognition sites are associated primarily with the dopamine transporter; 3) the low level of nonspecific binding of [3H]CFT and the marked depletion of [3H]CFT-labeled sites suggest that radiolabeled derivatives of CFT or its congeners may be suitable imaging probes for presynaptic dopamine nerve terminals.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Autoradiography
  • Carrier Proteins*
  • Caudate Nucleus / metabolism
  • Cocaine / analogs & derivatives
  • Cocaine / metabolism*
  • Corpus Striatum / metabolism*
  • Corpus Striatum / pathology
  • Humans
  • Parkinson Disease / metabolism*
  • Parkinson Disease / pathology
  • Putamen / metabolism
  • Receptors, Drug / analysis
  • Receptors, Drug / metabolism*
  • Reference Values
  • Tritium


  • Carrier Proteins
  • Receptors, Drug
  • cocaine receptor
  • Tritium
  • (1R-(exo,exo))-3-(4-fluorophenyl)-8-methyl-8- azabicyclo(3.2.1)octane-2-carboxylic acid, methyl ester
  • Cocaine