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Effect of cortisol on S. Typhimurium parental strain and an isogenic scsA mutant

ABSTRACT: S. Typhimurium 112910a parental strain and an isogenic ΔscsA strain were grown to stationary phase in SPI2 inducing minimal medium (MM5.8 - Erikkson et al., 2006 Inf & Imm., 74:1243) with or without supplementation with 1µM cortisol

ORGANISM(S): Salmonella enterica subsp. enterica serovar Gallinarum str. 287/91 Salmonella enterica subsp. enterica serovar Typhimurium str. DT104 Salmonella enterica subsp. enterica serovar Typhimurium str. SL1344 Salmonella enterica subsp. enterica serovar Typhimurium str. LT2 Salmonella enterica subsp. enterica serovar Typhimurium Salmonella enterica subsp. enterica serovar Enteritidis

PROVIDER: GSE55430 | GEO | 2014/02/28

SECONDARY ACCESSION(S): PRJNA239568

REPOSITORIES: GEO

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Project description:We have previously shown in sheep that 10 days of modest chronic increase in maternal cortisol result in fetal heart enlargement and Purkinje cell apoptosis. In subsequent studies in which we extended the duration of cortisol infusion (1mg/kg/d) to term, we found a dramatic incidence of stillbirth in the pregnancies with chronically increased cortisol and associated maternal hyperglycemia. To investigate the effects on the heart, transcriptomic analyses were performed on the septa using ovine microarrays and Webgestalt and Cytoscape programs for pathway inference. Analyses of the effects of 10 days of maternal cortisol infusion (130d-cortisol vs 130d control), ~25 days (term at ~140d-cortisol vs 140d control), normal maturation (140d-control vs 130d control) were performed. In all analyses gene ontology (GO) terms related to immune function and cytokine actions were significantly over-represented. After 10 days of cortisol, growth factor and muscle cell apoptosis pathways were significantly over-represented, consistent with our previous findings. We found significantly differentially regulated genes in the term fetuses (ie after ~25 days of cortisol) in pathways consistent with altered metabolism in the heart, particularly in mitochondria, associated with responses to hypoxia and to nutrient. Analysis of mitochondrial number by quantitative real-time PCR confirmed a significant decrease. These pathways were different from those modeled following the normal increase in cortisol in late gestation which contributes to normal maturation of the heart, and thus may be indicative of the fetal heart pathophysiologies seen in pregnancies complicated by diabetes, CushingM-bM-^@M-^Ys disease and chronic stress. 2 cohorts of singleton sheep fetuses at 129-131d gestation or 139-144d gestation (approximately term) were used. The first cohort received maternal cortisol infusion of 1mg/kg/day or vehicle for 10 days until approximately day 130 of gestation (n=6/group), the second cohort received the same dose of cortisol for approximately 25 days until near term (n=7, cortisol; n=7ewes, n=8 fetuses due to one set of twins, control)

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Effect of cortisol on S. Typhimurium parental strain and an isogenic scsA mutant

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