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Burke, NN,Hayes, E,Calpin, P,Kerr, DM,Moriarty, O,Finn, DP,Roche, M
2010
December
Neuroscience
Enhanced nociceptive responding in two rat models of depression is associated with alterations in monoamine levels in discrete brain regions
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olfactory bulbectomy Wistar Kayto rat hot plate formalin test mechanical allodynia serotonin OLFACTORY BULBECTOMIZED RAT TAIL-FLICK REFLEX WISTAR-KYOTO RATS ANIMAL-MODEL FRONTAL-CORTEX NUCLEUS SUBMEDIUS RECEPTOR AGONIST PAIN SENSITIVITY BEHAVIOR ANXIETY
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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 bulbectomised (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 minutes 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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DOI 10.1016/j.neuroscience.2010.10.030
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