Unknown,Transcriptomics,Genomics,Proteomics

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Transcription profiling of rat myometrium in the transition from late pregnancy to parturition

ABSTRACT: The process of parturition involves the complex interplay of factors that changes the excitability and contractile activity of the uterus. We have compared the relative gene expression profile of myometrium from rats before parturition (21 days pregnant) and during delivery using high-density DNA microarray. Of 8740 sequences available in the array a total of 3782 were detected as present. From the sequences that were significantly altered, 59 genes were upregulated and 82 genes were downregulated. We were able to detect changes in genes described to have altered expression level at term including connexin 43 and 26, cyclo-oxygenase 2 and oxytocin receptor as well as novel genes that have been not previously associated with parturition. Quantitative real time PCR on selected genes further confirmed the microarray data. Here we report for the first time that aquaporin5 (AQP5), a member of aquaporin (AQP) water channel family, was dramatically downregulated during parturition (~100 fold by microarray and ~50 fold by Real Time PCR). The emerging profile highlights biochemical cascades occurring in a period of about 36 hours that triggers parturition and the initiation of myometrium reverse remodeling after partum. The microarray analysis uncovered genes that were previously suspected to play a role in parturition. This regulation involves genes from immune/inflammatory response, steroid/lipids metabolism, calcium homeostasis, cell volume regulation, cell signaling, cell division, and tissue remodeling, suggesting the presence of multiple and redundant mechanisms altered in the process of birth. Experiment Overall Design: Uteri were dissected from late pregnant rats (21 days, LP) (three individuals, two replicates of sample 1) and rats during labor (DL) after the expulsion of the second pup (three individuals, two replicates of sample 1). After dissection, uteri were placed immediately in cold Ca2+-free PBS buffer and peripheral large blood vessels, external surrounding connective tissue and placenta were removed. The endometrium superficial layer was separated by gentle scraping. The myometrium was weighted, finely minced and homogenized with a polytron (Polytron PT3000, Brinkmann, Switzerland).

ORGANISM(S): Rattus norvegicus

SUBMITTER: Enrico Stefani

PROVIDER: E-GEOD-12799 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Background: Preterm birth is the leading cause of all infant mortality. In 2004, 12.5% of all births were preterm. In order to understand preterm labor, we must first understand normal labor. Since many of the myometrial changes that occur during pregnancy are similar in mice and humans and mouse gestation is short, we have studied the uterine genes that change in the mouse during pregnancy. Here, we used microarray analysis to identify uterine genes in the gravid mouse that are differentially regulated in the cyclooxygenase-1 knockout mouse model of delayed parturition. Methods: Gestational d18.0 uteri (n=4) were collected from pregnant wild-type and cyclooxygenase-1 knockout mice. Part of the uterus was used for frozen sections and RNA was isolated from the remainder. Microarray analysis was performed at the Indiana University School of Medicine Genomic Core and analyzed using the Microarray Data Portal. Northern analysis was performed to confirm microarray data and the genes localized in the gravid uterus by in situ hybridization. Results: We identified 277 genes that are abnormally expressed in the gravid d18.0 cyclooxygenase-1 knockout mouse. Nine of these genes are also regulated in the normal murine uterus during the last half of gestation. Many of these genes are involved in the immune response, consistent with an important role of the immune system in parturition. Expression of 4 of these genes; arginase I, IgJ, Tnfrsf9 and troponin; was confirmed by Northern analysis to be mis-regulated during pregnancy in the knockout mouse. In situ hybridization of these genes demonstrated a similar location in the gravid wild-type and Cox-1 knockout mouse uteri. Conclusions: To our knowledge, this is the first work to demonstrate the uterine location of these 4 genes in the mouse during late pregnancy. There are several putative transcription factor binding sites that are shared by many of the 9 genes identified here including; estrogen and progesterone response elements and Ets binding sites. In summary, this work identifies 9 uterine murine genes that may play a role in parturition. The function of these genes is consistent with an important role of the immune system in parturition. Experiment Overall Design: Gestational d18.0 uteri (n=4) were collected from pregnant wild-type and cyclooxygenase-1 knockout mice. Part of the uterus was used for frozen sections and RNA was isolated from the remainder. Microarray analysis (affymetrix 430 2.0) was performed at the Indiana University School of Medicine Genomic Core and analyzed using the Microarray Data Portal. In order to reduce the number of candidate parturition-related genes identified we compared the genes identified as abnormally expressed in the Cox-1 KO uterus to the genes that we had previously identified as changing from gestational d13.5 to d19.0 in the wild-type mouse uterus. Northern analysis was performed to confirm microarray data and the genes localized in the gravid uterus by in situ hybridization.

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Transcription profiling of rat myometrium in the transition from late pregnancy to parturition

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