C-nociceptor activation of hypothalamic neurones and the columnar organisation of their projections to the periaqueductal grey in the rat

B. M. Lumb, D. M. Parry, F. M. Semenenko, S. McMullan, D. A.A. Simpson

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The induction of Fos protein was used to localise hypothalamic neurones activated by ramps of noxious skin heating delivered at a rate of 2.5°C s-1 to preferentially activate C-nociceptors. This was combined with retrograde transport of cholera toxin subunit B from identified 'pressor' and 'depressor' sites in the dorsolateral/lateral or the ventrolateral columns of the periaqueductal grey. Fos-positive neurones were found throughout the rostral hypothalamus. Despite this wide distribution, those neurones double labelled retrogradely from the periaqueductal grey were focused in the lateral area of the anterior hypothalamus. More than 20% of Fos-positive neurones in this region projected to depressor sites in the ventrolateral periaqueductal grey, and 10% projected to its dorsolateral/lateral sector. These results are discussed in relation to the peripheral inputs to hypothalamic-midbrain pathways and their role in the cardiovascular responses to different components of the pain signal.

Original languageEnglish
Pages (from-to)123-128
Number of pages6
JournalExperimental Physiology
Volume87
Issue number2
DOIs
Publication statusPublished - 2002
Externally publishedYes

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