Subpopulations of neurons in the rat neostriatum display GABA(B)R1 receptor immunoreactivity

Kin Lam Yung*, T. K.Y. Ng, Chris K C Wong

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

45 Citations (Scopus)


Immunoreactivity for gamma aminobutyric acid BR1 receptor (GABA(B)R1) was detected in the neuropilar elements as well as in the perikarya of neurons in the neostriatum. Many of the GABA(B)R1-immunoreactive perikarya were medium-sized with a thin rim of cytoplasm. They resembled the morphology of medium spiny neurons, the projection neurons of the neostriatum. In addition, some GABA(B)R1-immunoreactive neurons were densely labeled and were of medium to large in size. These neurons were characterized by double immunofluorescence using their neurochemicals as markers. Over 90% of the parvalbumin- and choline acetyltransferase-immunoreactive neurons and about 80% of the nitric oxide synthase-immunoreactive neurons displayed GABA(B)R1 immunoreactivity. The present results show for the first time that the major four subpopulations of striatal neurons express GABA(B)R1 receptor and may have a functional implication in the GABA neurotransmission in the microcircuitry of the neostriatum.

Original languageEnglish
Pages (from-to)345-352
Number of pages8
JournalBrain Research
Issue number2
Publication statusPublished - 5 Jun 1999

Scopus Subject Areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

User-Defined Keywords

  • Basal ganglia
  • G-protein coupled receptor
  • Immunocytochemistry
  • Laser scan confocal microscopy
  • Medium spiny neuron
  • Striatal interneuron


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