By F Petraglia; Society for Gynecologic Investigation

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Extra info for Preterm birth: mechanisms, mediators, prediction, prevention, and interventions

Example text

69 In the study by Havelock et al43 in which tissues were collected at welldefined regions of the uterus rather than surgical incision sites, oxytocin receptor gene expression appeared to be increased in the lower uterine segment and cervix during labor. Although the significance of the laborassociated increase in oxytocin receptor mRNA in the cervix and lower uterine segment is not known, oxytocin stimulates prostaglandin E2 release from cervical tissues and myometrial smooth muscle cells in vitro,70,71 suggesting that increased oxytocin receptors in the cervix may facilitate cervical ripening through oxytocininduced increases in prostaglandin biosynthesis.

Control and assessment of the uterus and cervix during pregnancy and labour. Hum Reprod Update 1998; 4(5): 673–95. 19. Buhimschi IA, Dussably L, Buhimschi CS, Ahmed A, Weiner CP. Physical and biomechanical characteristics of rat cervical ripening are not consistent with increased collagenase activity. Am J Obstet Gynecol 2004; 191(5): 1695–704. 20. Harkness MLR, Harkness RD. Changes in the physical properties of the uterine cervix of the rat during pregnancy. J Physiol 1959; 148: 524–47. 21. Hollingsworth M, Williams LM.

32 Furthermore, COX-1-deficient mice, which show delay in the onset of term labor, did not show a delay in onset of preterm labor after administration of LPS. Thus, although induction of COX-2 in the fundal myometrium does not appear to be involved in physiologic labor at term, induction of COX-2 may play a role in parturition complicated by intrauterine infection. 3). Increased expression of COX-2 in the cervix is not singularly due to expression of COX-2 in infiltrating immune cells. 43,64 Rather, in the laboring cervix, COX-2 is expressed predominantly in cervical epithelial cells, stromal fibroblasts, and activated endothelial cells.

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Preterm birth: mechanisms, mediators, prediction, by F Petraglia; Society for Gynecologic Investigation
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