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RNA-sequencing of lung tissues from Gprc5a-/- mice at baseline, end of NNK exposure, three months and seven months post-NNK

ABSTRACT: We have previously shown that Gprc5a-KO mice develop lung tumors that are accelerated by exposure to the tobacco-specific carcinogen NNK. In this study we sought to understand the temporal evolution of gene expression changes in tumors and normal-appearing tissues.

ORGANISM(S): Mus musculus

PROVIDER: GSE147187 | GEO | 2021/03/31

REPOSITORIES: GEO

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RNA-sequencing of lung tissues from Gprc5a-/- and Gprc5a-/-/Lcn2-/- mice at baseline and seven months post-NNK

Project description:We have shown that Gprc5a-/- mice form Kras-mutant lung tumors spontaneously which is accelerated by tobacco carcinogen (NNK) exposure. We found in these mice that Lcn2 was distinctively up-regulated along the spectrum of Kras-mutant lung cancer development. To understand the role of Lcn2 in lung cancer pathogenesis, we generated Gprc5a-/-/Lcn2-/- mice and found that these animals have increased lung tumor devleopment following NNK compared to Gprc5a-/- animals with intact Lcn2. To understand these effects, we performed RNA-sequencing (RNA-Seq) of lung tissues from Gprc5a-/-/Lcn2-/- and Gprc5a-/- mice at baseline (prior to NNK exposure) and of tumor-bearing lungs from both groups at seven months post-NNK exposure.

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RNA-sequencing of NNK-exposed Gprc5a-/- lung tumors

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RNA-sequencing of lung tissues from Gprc5a-/- and Gprc5a-/-/Lcn2-/- mice at baseline and seven months post-NNK

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RNA-sequencing of lung tissues from Gprc5a-/- mice at baseline, end of NNK exposure, three months and seven months post-NNK

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Project description:Increasing the understanding of the impact of changes in oncogenes and tumor suppressor genes is essential for improving the management of lung cancer. Recently, we identified a new mouse lung-specific tumor suppressor - the G-protein coupled receptor 5A (Gprc5a). We sought to understand the molecular consequences of Gprc5a loss and towards this we performed microarray analysis of the transcriptomes of lung epithelial cells cultured from normal tracheas of Gprc5a knockout and wild-type mice to define a loss-of-Gprc5a gene signature. Moreover, we analyzed differential gene expression patterns between Gprc5a knockout normal lung epithelial cells as well as lung adenocarcinoma cells isolated and cultured from tumors of NNK-exposed Gprc5a knockout mice.

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Expression data from AJ and C3H mouse lungs exposed to NNK

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Project description:This study evaluated transcriptional effects of the lung carcinogen NNK ( 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone) injection and selenocystine consumption on the murine lung. Female A/J mice at 5 weeks of age were obtained from The Jackson Laboratory. Animals were stabilized on an unsupplemented AIN-76 diet for one week prior to being given the selenium supplemented diet. The basal level of selenium in the diet is 0.35 ppm Se, the selenocytine supplemention was at 15 ppm. NNK was administered i.p. as a single 10 uM injection in 0.2 mL saline. With this protocol, 100% of animals reproducibly develop lung tumors after 3 months. Three days after NNK administration, animals were provided AIN-76A diets supplemented with selenocystine at 15 ppm selenium ad libitum for 10 days. Animals were sacrificed thirteen days after NNK administration. Lung tissue was harvested, immediately homogenized in Trizol and frozen. The organic extracted RNAs were run over Qiagen RNeasy columes before quantifying and qualifying them. All samples had RNA quality index's greater than 9. Four groups of A/J mice were utilized with 4 biological replicates per group. 1) Untreated - controls on the AIN-76 diet (0.35 ppm Se). 2) NNK treated - single injection of NNK, maintained on norma AIN-76 diet, sacraficed after 13 days. 3) SECY - selenocystine supplemented (15 ppm) for 10 days on a AIN-76 diet then sacraficed. 4) NNK plus SECY - single injection of NNK, after 3 days, selenocystine supplemented (15 ppm) diet for 10 days then sacraficed. RNAs from the the four untreated mice were combined to phenotypically anchor the dual color expression profile. mouse lung responses to NNK injection and/or selenocystine dietary supplementation

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Transcriptional responses to NNK and selenocystine in mouse lungs.

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Expression data from AJ and C3H mouse lungs exposed to NNK

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