Localisation of tachykinin NK1 and NK3 receptors in the human prefrontal and visual cortex

The distribution of tachykinin NK1 and NK3 receptors in the prefrontal (Bro dmann area 9) and visual cortex (Brodmann area 17) of formalin-fixed postmo rtem human brain tissue was studied by immunohistochemistry. NK1-like immun oreactivity (NK1-LI) was observed as a thin band at the cortical surface an d dots of NK1-LI localised on small non-pyramidal cells and in the neuropil (layers I-III). NK3-LI was found in beaded fibres and cells with astrocyte -like morphology in the superficial cortical layers and white matter. Dots of NK3-LI were prominent in the neuropil and on pyramidal (layers III/V) an d non-pyramidal (layers V/VI) cells. The NK3-LI was more abundant and wides pread than the NK1-LI. This is the first report of the distribution of the NK1 receptor in the prefrontal and visual cortex of the human brain by immu nohistochemistry. (C) 2000 Elsevier Science Ireland Ltd. All rights reserve d.