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Expression of RHOGTPase regulators in human myometrium

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dc.contributor.author Mullins, Brian en
dc.contributor.author O'Brien, Margaret en
dc.contributor.author Flynn, David en
dc.contributor.author Smith, Terry J. en
dc.contributor.author Morrison, John J. en
dc.date.accessioned 2009-01-09T15:20:22Z en
dc.date.available 2009-01-09T15:20:22Z en
dc.date.issued 2008-01-11 en
dc.identifier.citation O'Brien, M., Flynn, D., Mullins, B., Morrison, J.J., Smith, T.J. 'Expression of RHOGTPase regulators in human myometrium' (2008) 'Reproductive Biology and Endocrinology', 6, art. no. 1, . en
dc.identifier.uri http://hdl.handle.net/10379/84 en
dc.description.abstract Background: RHOGTPases play a significant role in modulating myometrial contractility in uterine smooth muscle. They are regulated by at least three families of proteins, RHO guanine nucleotide exchange factors (RHOGEFs), RHOGTPase-activating proteins (RHOGAPs) and RHO guanine nucleotide inhibitors (RHOGDIs). RHOGEFs activate RHOGTPases from the inactive GDP-bound to the active GTP-bound form. RHOGAPs deactivate RHOGTPases by accelerating the intrinsic GTPase activity of the RHOGTPases, converting them from the active to the inactive form. RHOGDIs bind to GDP-bound RHOGTPases and sequester them in the cytosol, thereby inhibiting their activity. Ezrin-Radixin-Moesin (ERM) proteins regulate the cortical actin cytoskeleton, and an ERM protein, moesin (MSN), is activated by and can also activate RHOGTPases. Methods: We therefore investigated the expression of various RHOGEFs, RHOGAPs, a RHOGDI and MSN in human myometrium, by semi-quantitative reverse transcription PCR, real- time fluorescence RT-PCR, western blotting and immunofluorescence microscopy. Expression of these molecules was also examined in myometrial smooth muscle cells. Results: ARHGEF1, ARHGEF11, ARHGEF12, ARHGAP5, ARHGAP24, ARHGDIA and MSN mRNA and protein expression was confirmed in human myometrium at term pregnancy, at labour and in the non-pregnant state. Furthermore, their expression was detected in myometrial smooth muscle cells. It was determined that ARHGAP24 mRNA expression significantly increased at labour in comparison to the non-labour state. Conclusion: This study demonstrated for the first time the expression of the RHOGTPase regulators ARHGEF1, ARHGEF11, ARHGEF12, ARHGAP5, ARHGAP24, ARHGDIA and MSN in human myometrium, at term pregnancy, at labour, in the non-pregnant state and also in myometrial smooth muscle cells. ARHGAP24 mRNA expression significantly increased at labour in comparison to the non-labouring state. Further investigation of these molecules may enable us to further our knowledge of RHOGTPase regulation in human myometrium during pregnancy and labour. en
dc.format application/pdf en
dc.language.iso en en
dc.publisher Reproductive Biology and Endocrinology en
dc.subject RHOGTPases en
dc.title Expression of RHOGTPase regulators in human myometrium en
dc.type Article en

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