Reference : Lack of estrogen increases pain in the trigeminal formalin model: a behavioural and immu...
Scientific journals : Article
Social & behavioral sciences, psychology : Neurosciences & behavior
Human health sciences : Neurology
http://hdl.handle.net/2268/23901
Lack of estrogen increases pain in the trigeminal formalin model: a behavioural and immunocytochemical study of transgenic ArKO mice
English
Multon, Sylvie mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Neuro-anatomie >]
Pardutz, A. [> > > >]
Mosen, Jeanine mailto [Centre Hospitalier Universitaire de Liège - CHU > > Neurologie CHR >]
Hua, M. T. [> > > >]
de Fays, Christian [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Neuro-anatomie >]
Honda, S. I. [> > > >]
Harada, N. [> > > >]
Bohotin, C. [> > > >]
Franzen, Rachelle mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Neuro-anatomie >]
Schoenen, Jean mailto [Université de Liège - ULg > Département des sciences biomédicales et précliniques > Neuro-anatomie]
Mar-2005
Pain
Elsevier Science Bv
114
1-2
257-265
Yes (verified by ORBi)
International
0304-3959
Amsterdam
[en] serotonin ; CGRP ; trigeminal nucleus caudalis ; estrogen ; aromatase
[en] In order to examine the effect of estrogen on facial pain, we first compared the face-rubbing evoked by a formalin injection in the lip of aromatase-knockout (ArKO) mice, lacking endogenous estrogen production, 17 beta-estradiol-treated ArKO mice (ArKO-E2) and wild-type (WT) littermates. During the 'acute' phase of pain the time spent rubbing was similar in the three groups, whereas during the following 'interphase' and the second phase of pain, grooming was increased ill ArKO mice. Estradiol-treatment restored a behaviour similar to WT group. To better understand estrogens modulation on pain processes, we examined changes in 5-HT and CGRP innervations of trigeminal nucleus caudalis (TNC) in ArKO, ArKO-E2 and WT groups sacrified during the interphase. Whereas serotonin and CGRP immunoreactivities were comparable in WT and ArKO non-injected control groups, our data showed that 9 min after formalin injection, the density of serotoninergic terminals increased significantly in WT, but not in ArKO mice, while that of CGRP-immunoreactive fibers was lower in WT than in ArKO mice on the injected side. Estradiol-treatment only partially reversed these changes in ArKO-E2 mice. We conclude that estrogen deprivation in ArKO mice can be responsible for increased nociceptive response and that it is accompanied by transmitter changes favouring pro- over anti-nociceptive mechanisms in TNC during interphase of the formalin model. That estradiol-treatment completely reverses the behavioural abnormality Suggests that estrogens absence produces chiefly functional activation-dependent changes. However, the fact that the immunohistochemical abnormalities were not totally normalized by estradiol-treatment suggested that some permanent developmental alterations may occur in ArKO mice. (c) 2005 International Association for the Study of Pain. Published by Elsevier B.V. All rights reserved.
http://hdl.handle.net/2268/23901
10.1016/j.pain.2004.12.030

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