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2017 ; 127
(4
): 1370-1374
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Prostaglandin-mediated inhibition of serotonin signaling controls the affective
component of inflammatory pain
#MMPMID28287401
Singh AK
; Zajdel J
; Mirrasekhian E
; Almoosawi N
; Frisch I
; Klawonn AM
; Jaarola M
; Fritz M
; Engblom D
J Clin Invest
2017[Apr]; 127
(4
): 1370-1374
PMID28287401
show ga
Pain is fundamentally unpleasant and induces a negative affective state. The
affective component of pain is mediated by circuits that are distinct from those
mediating the sensory-discriminative component. Here, we have investigated the
role of prostaglandins in the affective dimension of pain using a rodent pain
assay based on conditioned place aversion to formalin injection, an inflammatory
noxious stimulus. We found that place aversion induced by inflammatory pain
depends on prostaglandin E2 that is synthesized by cyclooxygenase 2 in neural
cells. Further, mice lacking the prostaglandin E2 receptor EP3 selectively on
serotonergic cells or selectively in the area of the dorsal raphe nucleus failed
to form an aversion to formalin-induced pain, as did mice lacking the serotonin
transporter. Chemogenetic manipulations revealed that EP3 receptor activation
elicited conditioned place aversion to pain via inhibition of serotonergic
neurons. In contrast to their role in inflammatory pain aversion, EP3 receptors
on serotonergic cells were dispensable for acute nociceptive behaviors and for
aversion induced by thermal pain or a ? opioid receptor agonist. Collectively,
our findings show that prostaglandin-mediated modulation of serotonergic
transmission controls the affective component of inflammatory pain.
|*Pain Perception
[MESH]
|Affect
[MESH]
|Animals
[MESH]
|Cyclooxygenase 2/metabolism
[MESH]
|Cyclooxygenase Inhibitors/pharmacology
[MESH]
|Dinoprostone/*physiology
[MESH]
|Drug Evaluation, Preclinical
[MESH]
|Inflammation/pathology/psychology
[MESH]
|Mice, Knockout
[MESH]
|Pain/*psychology
[MESH]
|Pyrazoles/pharmacology
[MESH]
|Receptors, Prostaglandin E, EP3 Subtype/metabolism
[MESH]