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HERO ID
1222894
Reference Type
Journal Article
Title
Enhanced nociceptive responding in two rat models of depression is associated with alterations in monoamine levels in discrete brain regions
Author(s)
Burke, NN; Hayes, E; Calpin, P; Kerr, DM; Moriarty, O; Finn, DP; Roche, M
Year
2010
Is Peer Reviewed?
1
Journal
Neuroscience
ISSN:
0306-4522
EISSN:
1873-7544
Volume
171
Issue
4
Page Numbers
1300-1313
Language
English
PMID
20955767
DOI
10.1016/j.neuroscience.2010.10.030
Abstract
Altered pain responding in depression is a widely recognized but poorly understood phenomenon. The present study investigated nociceptive responding to acute (thermal and mechanical) and persistent (inflammatory) noxious stimuli in two animal models of depression, the olfactory bulbectomized (OB) and the Wistar-Kyoto (WKY) rat. In addition, this study examined if altered nociceptive behaviour was associated with changes in monoamine levels in discrete brain regions. OB rats exhibited mechanical allodynia (von Frey test) but not thermal hyperalgesia (hot plate and tail-flick tests) when compared to sham-operated counterparts. Formalin-induced nociceptive behaviour was both heightened and prolonged in OB versus sham-operated controls. An inverse correlation was observed between 5-hydroxyindoleacetic acid (5-HIAA) concentration in the hippocampus and amygdaloid cortex and nociceptive behaviour in the formalin test. In comparison, WKY rats exhibited thermal hyperalgesia in the hot plate test, while behaviour in the tail-flick and von Frey tests did not differ between WKY and Sprague-Dawley rats. Furthermore, WKY rats exhibited enhanced formalin-evoked nociceptive responding up to 40 min post administration, an effect inversely correlated with serotonin and 5-HIAA levels in the hypothalamus. In conclusion, these findings demonstrate that altered pain responding observed in clinically depressed patients can be modelled pre-clinically, providing a means of investigating the neurochemical basis of, and possible treatments for, this phenomenon.
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