Substance P-like immunoreactivity in the lateral cervical nucleus of the owl monkey (Aotus trivirgatus): a comparison with the cat and rat.

The Journal of Comparative Neurology
J Broman, A Blomqvist

Abstract

The location of substance P (SP) in the lateral cervical nucleus (LCN) of monkeys (Aotus trivirgatus), cats, and rats was investigated with immunohistochemical methods. Light microscopic analysis showed that SP-positive fibers and terminals are evenly distributed throughout the LCN of the monkey and rat, whereas the SP labeling in the LCN of the cat is concentrated in the medial part of the nucleus, with only very sparse labeling in the lateral part. Electron microscopic examination of the monkey LCN revealed the presence of SP-like immunoreactivity within terminal boutons and unmyelinated axons. The SP-positive boutons are in synaptic contact with dendrites and, occasionally, cell bodies; they contain densely packed, clear, round synaptic vesicles, as well as dense-core vesicles. The distribution of SP-like immunoreactivity in the LCN of monkeys, cats, and rats is similar to that of nociceptive-responsive neurons demonstrated in electrophysiological experiments. The possible role of the SP-containing fibers in the transmission of nociceptive information through the LCN is discussed.

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Citations

Jul 26, 1991·Brain Research·M V Smith, A V Apkarian
Mar 17, 2004·The Journal of Comparative Neurology·Leonora J MoutonGert Holstege
Mar 15, 1993·The Journal of Comparative Neurology·J Broman, B H Pubols
Apr 19, 2021·Veterinary Research Communications·Annamaria GrandisCristiano Bombardi
Aug 1, 1992·The Journal of Comparative Neurology·A D CraigA Blomqvist
Jan 22, 1992·The Journal of Comparative Neurology·G Battaglia, A Rustioni

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