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Cyclic AMP increases COX-2 expression via mitogen-activated kinase in human myometrial cells
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Chen, Li I., Sooranna, Suren R., Lei, Kaiyu, Kandola, Mandeep, Bennett, Phillip, Liang, Zhiqing, Grammatopoulos, Dimitris and Johnson, Mark R. (2012) Cyclic AMP increases COX-2 expression via mitogen-activated kinase in human myometrial cells. Journal of Cellular and Molecular Medicine, Volume 16 (Number 7). pp. 1447-1460. doi:10.1111/j.1582-4934.2011.01413.x ISSN 15821838.
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Official URL: http://dx.doi.org/10.1111/j.1582-4934.2011.01413.x
Abstract
Cyclic AMP (cAMP) is the archetypal smooth muscle relaxant, mediating the effects of many hormones and drugs. However, recently PGI2, acting via cAMP/PKA, was found to increase contraction-associated protein expression in myometrial cells and to promote oxytocin-driven myometrial contractility. Cyclo-oxygenase-2 (COX-2) is the rate-limiting enzyme in prostaglandin synthesis, which is critical to the onset and progression of human labour. We have investigated the impact of cAMP on myometrial COX-2 expression, synthesis and activity. Three cAMP agonists (8-bromo-cAMP, forskolin and rolipram) increased COX-2 mRNA expression and further studies confirmed that this was associated with COX-2 protein synthesis and activity (increased PGE2 and PGI2 in culture supernatant) in primary cultures of human myometrial cells. These effects were neither reproduced by specific agonists nor inhibited by specific inhibitors of known cAMP-effectors (PKA, EPAC and AMPK). We then used shRNA to knockdown the same effectors and another recently described cAMP-effector PDZ-GEF1-2, without changing the response to cAMP. We found that MAPK activation mediated the cAMP effects on COX-2 expression and that PGE2 acts through EP-2 to activate MAPK and increase COX-2. These data provide further evidence in support of a dual role for cAMP in the regulation of myometrial function.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QH Natural history > QH301 Biology R Medicine > RG Gynecology and obstetrics |
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Divisions: | Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School > Biomedical Sciences > Translational & Experimental Medicine > Metabolic and Vascular Health (- until July 2016) Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Myometrium , Uterus -- Contraction, Molecular biology -- Research, Prostaglandins | ||||
Journal or Publication Title: | Journal of Cellular and Molecular Medicine | ||||
Publisher: | Wiley-Blackwell Publishing, Inc | ||||
ISSN: | 15821838 | ||||
Official Date: | 2012 | ||||
Dates: |
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Volume: | Volume 16 | ||||
Number: | Number 7 | ||||
Page Range: | pp. 1447-1460 | ||||
DOI: | 10.1111/j.1582-4934.2011.01413.x | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Date of first compliant deposit: | 22 December 2015 | ||||
Date of first compliant Open Access: | 22 December 2015 | ||||
Funder: | Action Medical Research (AMR) | ||||
Grant number: | SP4573 |
Data sourced from Thomson Reuters' Web of Knowledge
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