Project description:Mechanisms underlying cancer stemness in Kras-mutant lung adenocarcinoma (KM-LUAD) are poorly understood. We previously found that mice with knockout of Gprc5a develop LUADs with somatic Kras mutations. We also previously derived Gprc5a-/- KM-LUAD cells (MDA-F471 cells) from a mouse exposed to the tobacco-specific carcinogen NNK. We also derived cancer stem cells (CSCs; grown and cultured as spheres in 3D cultures) from MDA-F471 cells. To better understand the biology of these CSCs, we compared the transcriptomes of MDA-F471 cells and their CSC counterparts by bulk RNA-sequencing.

2022-11-30 | GSE219124 | GEO

Trametinib sensitizes KRAS-mutant lung adenocarcinoma tumors to PD-1/PD-L1 axis blockade via Id1 downregulation

Project description:The identification of novel therapeutic strategies to overcome the intrinsic or acquired resistance to trametinib in mutant KRAS lung adenocarcinoma (LUAD) is a major challenge. This study analyzes the effects of trametinib in Id1, a key factor involved in the oncogenic KRAS pathway, and investigates the Id1 role in acquire resistance and synergy with immunotherapy in KRAS-driven LUAD. Restoring the antitumor immune response by blocking programmed-cell death protein 1 (PD-1) and programmed-cell death-ligand 1 (PD-L1) pathway represents a major breakthrough in non-small-cell lung cancer (NSCLC) treatment. Nevertheless, a high proportion of LUAD patients with KRAS alterations remain refractory to this therapy. Material and Methods: To explore whether MEK1/2 inhibition reduces Id1 expression, in vitro and in vivo experiments were conducted in KRAS-mutant NSCLC cells and murine models. RNAseq analysis was performed to elucidate the pathways involved in Id1 inhibition. Apoptosis and PD-L1 expression was measured by flow cytometry. Synergy of trametinib combined with anti-PD1 was investigated in KRAS-mutant LUAD mouse models. Results: Using preclinical syngeneic KRAS-mutant lung cancer mouse models, we demonstrate that trametinib synergizes with PD-1 blockade to reduce lung cancer progression and increase mice overall survival. This antitumor activity was linked to the degradation of Id1 via proteasome, and an enhanced INF-Y-mediated PD-L1 tumor cell expression in KRAS-mutant tumor cells. This effect required CD8+ T cells, boosted the intratumoral CD8+/Treg ratio, reducing the intratumoral Treg/CD4+ ratio. Conclusions: Our data may support the role of Id1 in the trametinib antitumoral effect, sustaining the mitogen-activated protein kinases (MAPK) signaling pathway involved in the trametinib acquired resistance cells and sensitizing KRAS-mutant lung tumors to PD-1 inhibitors, through PD-L1 overexpression.

2024-05-17 | GSE236258 | GEO

Transcriptomic profiling of oncogenic KRAS and TP53 in lung adenocarcinoma cells

Project description:Based on the previous eVIP study (Cancer Cell, 2016), we profiled the transcriptomes of lung adenocarcinoma cell lines expressing oncogenic KRAS and TP53 to compare methods and investigate the effects of these oncogenes on the cells' whole transcriptomes.

2021-10-01 | GSE183670 | GEO

Disruption of STAT3 signaling promotes KRAS induced lung tumorigenesis

Project description:Oncogenic STAT3 functions are known in various malignancies. We found that STAT3 plays an unexpected tumor suppressive role in KRAS-mutant non-small-cell-lung cancer (NSCLC). In mice, tissue-specific inactivation of Stat3 resulted in increased Kras (G12D)-driven NSCLC initiation and malignant progression leading to markedly reduced survival. Clinically, low STAT3 expression levels correlate with poor survival in human lung adenocarcinoma patients with smoking history. Consistently, KRAS-mutant lung tumors showed reduced STAT3 levels. Mechanistically, we show that STAT3 controls NFÎºB-induced IL-8-expression by sequestering NFÎºB in the cytoplasm while IL-8 in turn regulates myeloid tumor infiltration and tumor vascularization thereby promoting tumor progression. These results identify a novel STAT3-NFÎºB-IL-8 axis in KRAS-mutant NSCLC with therapeutic and prognostic relevance WT: Control lung; KRAS: Lung tumors expressing KRAS G12D; KRAS STAT3 KO: Lung tumors expressing KRAS G12D- STAT3 deficient; tumors of four mice pooled per sample

2015-02-05 | E-GEOD-52798 | biostudies-arrayexpress

UHRF1 is a mediator of KRAS driven oncogenesis in lung adenocarcinoma [CRISPR_screen]

Project description:We performed a focused CRISPR in KRAS mutant lung cancer cells (A549) using a minipool sgRNA library targeting 80 lung cancer specific tumor suppressor genes and 12 control genes. This screen identified tumor suppressor genes regulated by Uhrf1 in KRAS mutant lung cancer.

2023-05-25 | GSE233401 | GEO

RNA-seq to investigate impact of treatment of KRAS mutant A549 lung adenocarcinoma cells with the multi-ERBB inhibitor Neratinib

Project description:KRAS mutation is widely presumed to confer independence from upstream RTK signalling, however emerging evidence from mouse models of lung cancer suggests that ERBB RTKs may amplify signalling through RAS isoforms and participate in mutant RAS-driven lung cancer. This is one of 3 datasets where we examined the transcriptional impact of treatment of KRAS mutant human lung cancer cell lines with the multi-ERBB inhibitor Neratinib

2018-06-01 | E-MTAB-6483 | biostudies-arrayexpress

Effect of vimentin deletion on gene expression in Kras-G12D-mutant, p53-null lung adenocarcinoma cells

Project description:Effect of vimentin deletion on gene expression in Kras-G12D-mutant, p53-null lung adenocarcinoma cells

| PRJNA933706 | ENA