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Aurora A Kinase Inhibition Induces Accumulation of Tumor Cells in Mitosis with Restored Interferon Signaling to Potentiate Response to PD-L1 Immune Checkpoint Blockade [single cell RNA-seq]

ABSTRACT: By arresting tumor cells in mitosis, aurora A kinase inhibition restores interferon signaling in small cell lung cancer tumor cells and cooperates with PD-L1 immune checkpoint blockade.

ORGANISM(S): Mus musculus

PROVIDER: GSE214485 | GEO | 2023/09/26

REPOSITORIES: GEO

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Aurora A Kinase Inhibition Induces Accumulation of Tumor Cells in Mitosis with Restored Interferon Signaling to Potentiate Response to PD-L1 Immune Checkpoint Blockade [RNA-seq]

Project description:By arresting tumor cells in mitosis, aurora A kinase inhibition restores interferon signaling in small cell lung cancer tumor cells and cooperates with PD-L1 immune checkpoint blockade.

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Aurora A Kinase Inhibition Induces Accumulation of Tumor Cells in Mitosis with Restored Interferon Signaling to Potentiate Response to PD-L1 Immune Checkpoint Blockade

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Aurora A Kinase Inhibition Induces Accumulation of Tumor Cells in Mitosis with Restored Interferon Signaling to Potentiate Response to PD-L1 Immune Checkpoint Blockade [RNA-seq]

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Association with Aurora-A controls N-MYC-dependent promoter escape and pause release of RNA polymerase II during the cell cycle

Project description:MYC proteins bind globally to active promoters and promote transcriptional elongation by RNA polymerase II (RNAPII). To identify effector proteins that mediate this function, we performed mass spectrometry on N-MYC complexes in neuroblastoma cells. The analysis shows that N-MYC forms complexes with TFIIIC, TOP2A and RAD21, a subunit of cohesin. N-MYC and TFIIIC bind to overlapping sites in thousands of RNAPII promoters and intergenic regions. TFIIIC promotes association of RAD21 with N-MYC target sites and is required for N-MYC-dependent promoter escape and pause release of RNAPII. Aurora-A competes with binding of TFIIIC and RAD21 to N-MYC in vitro and antagonizes association of TOP2A, TFIIIC and RAD21 with N-MYC during S-phase, blocking N-MYC-dependent release of RNAPII from the promoter. Inhibition of Aurora-A in S-phase restores RAD21 and TFIIIC binding to chromatin and partially restores N-MYC-dependent transcriptional elongation. We propose that complex formation with Aurora-A controls N-MYC function during the cell cycle.

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