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Effects of gestational exposure to air pollution on placental transcriptome

ABSTRACT: We report the expression pattern of placental transcriptome by Next Generation Sequencing from Gestational D19 mouse exposed to Air -Pollutant material with or without prior treatment with Fish Oil.

ORGANISM(S): Mus musculus

PROVIDER: GSE178098 | GEO | 2022/05/25

REPOSITORIES: GEO

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Effects of gestational exposure to air pollution on placental methylation mark

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Gestational Exposure to Air Pollutants Perturbs Metabolic and Placenta-Fetal Phenotype

Project description:Introduction: Air pollution is detrimental to a pregnancy with adverse effects in mother and child. It is also known to increase pregnancy complications including risk factors of gestational diabetes. Methods: We investigated the impact of intra-nasal instilled air pollutants upon gestational day 16-19 maternal mouse cardiovascular and metabolic status, placental nutrient transporters, and placental-fetal size and morphology. To further unravel mechanisms, we also examined placental total DNA 5’-hydroxymethylation and bulk RNA sequenced gene expression profiles. Results: Air pollution exposed pregnant mice were tachycardic, hyperglycemic, glucose intolerant and insulin resistant, with no major placental glucose and fatty acid transporter changes, except for a spatial disruption of cells expressing GLUT10 that imports L-dehydroascorbic acid in protecting against oxidative stress. Placentas revealed inflammatory cellular infiltration with associated cellular edema and necrosis, with a paucity of vascularity and hemorrhage. While individual fetal body weights increased, they suffered a reduction in brain cortical thickness. Placental total DNA 5’-hydroxymethylation was 2.5-fold higher, with perturbed gene expression profiles involving key metabolic, inflammatory, transcriptional, cellular polarizing and processing genes and pathways. Discussion: We conclude that gestational exposure to air pollutants incites a maternal inflammatory response resulting in features of maternal gestational diabetes mellitus with altered placental gene expression with associated injury to the placental-fetal unit. Thus, air pollutants adversely impact the health of mother and offspring.

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Adult mouse hippocampal transcriptome changes associated with long-term behavioral and metabolic effects of gestational air pollution toxicity

Project description:Gestational exposure to air pollution increases the risk of autism spectrum disorder and cognitive impairments with unresolved molecular mechanisms. This study exposed mice throughout gestation to urban derived nanosized particulate matter (nPM). Young adult male and female offspring were studied for behavioral and metabolic changes using forced swim test, fat gain, glucose tolerance, and hippocampal transcriptome. Gestational nPM exposure caused increased depressive behaviors, decreased neurogenesis in the dentate gyrus, and increased glucose tolerance in adult male offspring. Both sexes gained fat and body weight. Gestational nPM exposure induced 29 differentially expressed genes (DEGs) in adult hippocampus related to cytokine production, IL17a signaling, and dopamine degradation in both sexes. Stratification by sex showed 2-fold more DEGs in males than females (69 vs 37), as well as male-specific enrichment of DEGs mediating serotonin signaling, endocytosis, Gai, and cAMP signaling. Gene co-expression analysis (WCGNA) identified a module of 43 genes with divergent responses to nPM between the sexes. Chronic changes in 14 DEGs (e.g., miR9-1) were associated with depressive behaviors, adiposity and glucose intolerance. These genes enriched neuroimmune pathways such as HMGB1 and TLR4. Based on cerebral cortex transcriptome data of neonates, we traced the initial nPM responses of HMGB1 pathway. In vitro, mixed glia responded to 24 h nPM with lower HMGB1 protein and increased proinflammatory cytokines. This response was ameliorated by TLR4 knockdown. In sum, we identified transcriptional changes that could underlie air pollution mediated behavioral and phenotypic changes. These identified genes merit further studies for therapeutic intervention development.

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Project description:This SuperSeries is composed of the SubSeries listed below.

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