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GCH1-polymorphism and pain sensitivity among women with provoked vestibulodynia
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
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2012 (English)In: MOL PAIN, ISSN 1744-8069, Vol. 8, 68- p.Article in journal (Refereed) Published
Abstract [en]

Background: Provoked vestibulodynia (PVD) is a pain disorder localized in the vestibular mucosa. It is the most common cause of dyspareunia among young women and it is associated with general pain hypersensitivity and other chronic pain conditions. Polymorphism in the guanosine triphosphate cyclohydrolase (GCH1) gene has been found to influence general pain sensitivity and the risk of developing a longstanding pain condition. The aim of this study was to investigate GCH1-polymorphism in women with PVD and healthy controls, in correlation to pain sensitivity. Results: We found no correlation between the previously defined pain-protective GCH1-SNP combination and the diagnosis of PVD. Nor any correlation with pain sensitivity measured as pressure pain thresholds on the arm, leg and in the vestibule, coital pain scored on a visual analog scale and prevalence of other bodily pain conditions among women with PVD (n = 98) and healthy controls (n = 102). However, among patients with current treatment (n = 36), there was a significant interaction effect of GCH1-gene polymorphism and hormonal contraceptive (HC) therapy on coital pain (p = 0.04) as well as on pressure pain thresholds on the arm (p = 0.04). PVD patients carrying the specified SNP combination and using HCs had higher pain sensitivity compared to non-carriers. In non-HC-users, carriers had lower pain sensitivity. Conclusions: The results of this study gave no support to the hypothesis that polymorphism in the GCH1-gene contributes to the etiology of PVD. However, among patients currently receiving treatment an interaction effect of the defined SNP combination and use of hormonal contraceptives on pain sensitivity was found. This finding offers a possible explanation to the clinically known fact that some PVD patients improve after cessation of hormonal contraceptives, indicating that PVD patients carrying the defined SNP combination of GCH1 would benefit from this intervention.

Place, publisher, year, edition, pages
2012. Vol. 8, 68- p.
Keyword [en]
Provoked vestibulodynia, Pain, GCH1, Gene, Polymorphism, SNP, Hormonal contraceptives
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-187725DOI: 10.1186/1744-8069-8-68ISI: 000310781500001OAI: diva2:575668
Available from: 2012-12-11 Created: 2012-12-10 Last updated: 2012-12-11Bibliographically approved

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Grönbladh, AlfhildNyberg, FredNilsson, Kent W.
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Department of Pharmaceutical BiosciencesCentre for Clinical Research, County of Västmanland
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