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Previous studies showed that this infection alters physiological activities in mouse oviducts. Whether this occurs in the uterus and cervix has never been investigated. This study characterized the physiological activities of the uterine horn and the cervix in a Chlamydia muridarum ( Cmu)-infected mouse model at three infection time points of 7, 14, and 21 days postinfection (dpi). Cmu infection significantly decreased contractile force of spontaneous contraction in the cervix (7 and 14 dpi; P &lt; 0.001 and P &lt; 0.05, respectively), but this effect was not observed in the uterine horn. The responses of the uterine horn and cervix to oxytocin were significantly altered by Cmu infection at 7 dpi ( P &lt; 0.0001), but such responses were attenuated at 14 and 21 dpi. Cmu infection increased contractile force to prostaglandin (PGF<jats:sub>2\u03b1<\/jats:sub>) by 53\u201383% in the uterine horn. This corresponded with the increased messenger ribonucleic acid (mRNA) expression of Ptgfr that encodes for its receptor. However, Cmu infection did not affect contractions of the uterine horn and cervix to PGE<jats:sub>2<\/jats:sub> and histamine. The mRNA expression of Otr and Ptger4 was inversely correlated with the mRNA expression of Il1b, Il6 in the uterine horn of Cmu-inoculated mice ( P &lt; 0.01 to P &lt; 0.001), suggesting that the changes in the Otr and Ptger4 mRNA expression might be linked to the changes in inflammatory cytokines. Lastly, this study also showed a novel physiological finding of the differential response to PGE<jats:sub>2<\/jats:sub> in mouse uterine horn and cervix. <\/jats:p>","DOI":"10.1152\/ajpendo.00513.2019","type":"journal-article","created":{"date-parts":[[2020,4,21]],"date-time":"2020-04-21T17:48:05Z","timestamp":1587491285000},"page":"E981-E994","source":"Crossref","is-referenced-by-count":8,"title":["<i>Chlamydia muridarum<\/i> infection differentially alters smooth muscle function in mouse uterine horn and cervix"],"prefix":"10.1152","volume":"318","author":[{"given":"Jia Ming","family":"Lee","sequence":"first","affiliation":[{"name":"School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, New South Wales, Australia"},{"name":"Hunter Medical Research Institute, New Lambton Heights, New South Wales, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jemma R.","family":"Mayall","sequence":"additional","affiliation":[{"name":"School of 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