title: The expression of cyclooxygenase-2 in cervical cancers and Hela cells was regulated by estrogen/progestogen.
abstract: To investigate the relationship between the expression of cyclooxygenase-2 (COX-2) and menstrual cycle, the regulatory effects of 17-beta-estradiol (E(2)) and medroxyprogesterone acetate (MPA) on the expression of COX-2 in cervical cancer Hela cells were examined. Cervical cancer specimens were obtained from 47 pre-menopausal patients. The phase of menstrual cycle was determined by case history and HE staining of uterine endometrium. COX-2 was immunohistochemically stained by SABC staining and the staining intensity was determined with computerized image analysis system. Hela cells were incubated with alcohol, E(2), E(2)+MPA, MPA for 12, 24 and 48 h respectively. The expression of COX-2 in Hela cells was detected by Western blotting and reverse transcriptase-polymerase chain reaction (RT-PCR). Our results showed that the expression of COX-2 was significantly higher during proliferative phase than secretory phase (P<0.05), but there was no difference in the positive rate between proliferative phase and secretory phase (P>0.05). Incubation with E(2) could significantly enhance the expression of COX-2 continually. On the contrary, E(2)+MPA and MPA alone could decrease the expression of COX-2 as compared with the control and E(2) group (P<0.05 and P<0.01 respectively). It is concluded that the expression of COX-2 in cervical cancer of pre-menopausal patients and Hela cells was regulated by estrogen/progestogen.
authors.affiliation: Department of Obstetrics and Gynecology, Qilu Hospital, Shandong University, Jinan 250021, China. li91018@163.com
authors.forename: Yunguang
authors.initials: Y
authors.lastname: Li
authors.forename: Demin
authors.initials: D
authors.lastname: Pu
authors.forename: Yanli
authors.initials: Y
authors.lastname: Li
mesh_terms: D000328:Adult; D051546:Cyclooxygenase 2 / Q000235:genetics / Q000378:metabolism*; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D006367:HeLa Cells; D006801:Humans; D017258:Medroxyprogesterone Acetate / Q000494:pharmacology*; D008875:Middle Aged; D002583:Uterine Cervical Neoplasms / Q000201:enzymology*