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Dernière publication 24/05/2014

Use of dynamic weight bearing as a novel end-point for the assessment of abdomin

Background Chronic pelvic pain (CPP) is defined as long-lasting and severe pelvic pain persisting over six months in cyclic or non-cyclic chronic...

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    [title] => Use of dynamic weight bearing as a novel end-point for the assessment of abdomin
    [paragraph] => Use of dynamic weight bearing as a novel end-point for the assessment of abdominal pain in the LPS-induced peritonitis model in the rat
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Authors
M. Gruen, A. Laux-Biehlmann, T. M. Zollner, J. Nagel

 Lab
Bayer Healthcare Pharmaceuticals, Berlin, Germany
Journal
Journal of Neuroscience Methods
Abstract

Background
Chronic pelvic pain (CPP) is defined as long-lasting and severe pelvic pain persisting over six months in cyclic or non-cyclic chronic manner. Various pathologic conditions like endometriosis, abdominal infections, intra-peritoneal adhesions or infection, underlie CPP which is often the leading symptom of the associated diseases. Pharmacological approaches addressing CPP are hampered by the absence of a straight-forward, objective, and reliable method for the assessment of CPP in rodents.

Method
In the presented study, the dynamic weight bearing system (DWB) was employed for the first time for the evaluation of pelvic pain in a rat model of LPS-induced peritonitis. Rats were pretreated with the COX-2 inhibitor rofecoxib and PGE2 levels were evaluated in peritoneal lavage.

Results
DWB analysis revealed that rats treated with LPS showed a relief posture by a significantly increased weight distribution to the front when compared to vehicle-treated animals. This effect was prevented by rofecoxib treatment indicating the sensitivity of the model for pelvic pain related to peritonitis. Analysis of the PGE2 levels in the peritoneal fluid indicated a correlation with the relief posture intensity.

Comparison with existing method(s)
In contrast to others weight bearing approaches, the use of DWB allows evaluation of spontaneous posture changes as a consequence of pelvic pain.

Conclusion
Taken together, we were able to show, that DWB combined with LPS-induced peritonitis may deliver a new reliable animal model addressing pelvic pain with high construct validity (peritoneal inflammation), and face validity (pain related relief posture).
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Un système permettant l'analyse de la posture des animaux par la répartition du poids sur chacune des 4 pattes. Le DWB est un test unique dans l'étude de nombreux modèles de douleurs, principalement non évoquée , neuropathique ou encore inflammatoire ainsi que pour les études sur l'osthéoarthrite et divers affections du SNC. 

Le nouvelle version DWB2 intègre une nouvelle interface logiciel plus simple avec gestion des listes d'animaux ainsi que de nouveaux algorithmes d'analyse automatique de la posture.

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