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RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition

ABSTRACT: RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition

PROVIDER: PRJNA736076 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14760947.fastq.gz	Fastqsanger.gz
	SRR14760948.fastq.gz	Fastqsanger.gz
	SRR14760951.fastq.gz	Fastqsanger.gz
	SRR14760952.fastq.gz	Fastqsanger.gz
	SRR14760953.fastq.gz	Fastqsanger.gz

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RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [ChIP-seq]

Project description:Genomic loss of RB1 is a common alteration in castration-resistant prostate cancer (CRPC) and is associated with poor patient outcomes. RB1-loss is also a driver event that promotes the neuroendocrine transdifferentiation of prostate cancer (PCa). The loss of Rb protein disrupts the Rb-E2F repressor complex and thus hyperactivates E2F transcription activators. While the impact of RB1-loss on PCa progression and linage plasticity has been previously studied, the underline mechanisms remain unclear. Using an integrated cistromic and transcriptomic analysis, we have characterized Rb activities in multiple CRPC models by identifying Rb directly regulated genes and revealed that Rb has distinct binding sites and targets in TP53-mutated CRPC. Significantly, we show that RB1-loss promotes the noncanonical activator function of LSD1/KDM1A, which stabilizes chromatin binding of E2F1, and hence sensitizes CRPC tumor to the LSD1 inhibitor treatment. These results provide new molecular insights of Rb activity in PCa progression and suggest LSD1 as a potential therapeutic target in CRPC with RB1-loss.

2022-01-14 | GSE176402 | GEO

RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [RNA-seq]

2022-01-14 | GSE176403 | GEO

RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [RNA-seq]

Project description:RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [RNA-seq]

| PRJNA736079 | ENA

RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [ChIP-seq]

Project description:RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition [ChIP-seq]

| PRJNA736078 | ENA

RB1 loss promotes a noncanonical activator function of LSD1 and sensitizes castration-resistant prostate cancer to LSD1 inhibition

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

2022-01-14 | GSE176404 | GEO

RB1 loss in castration-resistant prostate cancer confers vulnerability to LSD1 inhibition.

Project description:Genomic loss of RB1 is a common alteration in castration-resistant prostate cancer (CRPC) and is associated with poor patient outcomes. RB1 loss is also a critical event that promotes the neuroendocrine transdifferentiation of prostate cancer (PCa) induced by the androgen receptor (AR) signaling inhibition (ARSi). The loss of Rb protein disrupts the Rb-E2F repressor complex and thus hyperactivates E2F transcription activators. While the impact of Rb inactivation on PCa progression and linage plasticity has been previously studied, there is a pressing need to fully understand underlying mechanisms and identify vulnerabilities that can be therapeutically targeted in Rb-deficient CRPC. Using an integrated cistromic and transcriptomic analysis, we have characterized Rb activities in multiple CRPC models by identifying Rb-directly regulated genes and revealed that Rb has distinct binding sites and targets in CRPC with different genomic backgrounds. Significantly, we show that E2F1 chromatin binding and transcription activity in Rb-deficient CRPC are highly dependent on LSD1/KDM1A, and that Rb inactivation sensitizes CRPC tumor to the LSD1 inhibitor treatment. These results provide new molecular insights into Rb activity in PCa progression and suggest that targeting LSD1 activity with small molecule inhibitors may be a potential treatment strategy to treat Rb-deficient CRPC.

| S-EPMC8818029 | biostudies-literature

Targeting the scaffolding role of LSD1 (KDM1A) poises acute myeloid leukemia cells for Retinoic Acid induced differentiation

Project description:The histone demethylase LSD1 is deregulated in several tumors, including leukemias, providing the rationale for the clinical use of LSD1 inhibitors. In acute promyelocytic leukemia (APL), pharmacological doses of retinoic acid (RA) induce differentiation of APL cells through degradation of the PML-RAR oncogene. APL cells are resistant to LSD1 inhibition or knock-out, but LSD1 inhibition sensitizes them to physiological doses of RA without altering the stability of PML-RAR, and extends survival of leukemic mice upon RA treatment. Non-enzymatic activities of LSD1 are essential to block differentiation of leukemic cells, while the combination of LSD1 inhibitors (or LSD1 knock-out) with low doses of RA releases a differentiation-associated gene expression program, not strictly dependent on changes in histone H3K4 methylation (known substrate of LSD1). An integrated proteomic/epigenomic/mutational analysis showed that LSD1 inhibitors alter the recruitment of LSD1-containing complexes to chromatin through inhibition of the interaction between LSD1 and GFI1, a relevant transcription factor in hematopoiesis.

2020-05-26 | PXD012954 | Pride

Expression data from murine fetal liver cells, combinations of RB1 family knockouts

Project description:Retinoblastoma-1 (RB1), and the RB1-related proteins p107 and p130, reside at a central node in the cell cycle regulatory network. RB1 is required for normal erythroid development in vitro, but is largely dispensable for erythropoiesis in vivo. The modest phenotype caused by RB1 deficiency in mice raises questions about redundancy within the RB1 family, and the role of RB1 in erythroid differentiation. Here we show that RB1 is the major pocket protein that regulates terminal erythroid differentiation. Erythroid cells lacking all pocket proteins exhibit the same cell cycle defects as those deficient for RB1 alone. Further, we show that RB1 broadly represses gene expression in erythroid cells, coincident with the transition from precursor to terminally differentiated cell. RB1-repressed genes are well expressed but downregulated at the final stage of erythroid development. By merging differential and time-dependent changes in expression, we define a group of approximately 800 RB1-repressed genes. As anticipated, these genes are enriched for terms such as cell cycle and DNA metabolic process, but also for terms such as mRNA processing, chromosome organization, and ubiquitin-mediated protein catabolic pro-cess. Our results suggest that RB1-mediated repression of genes involved in noncanonical processes has a central role in terminal erythroid differentiation.

2015-10-01 | GSE67276 | GEO

Expression data from murine fetal liver cells in culture, time course, combinations of RB1 and p107 knockouts

2015-10-01 | GSE67278 | GEO

LSD1 promotes castration-resistant prostate cancer progression

Project description:LSD1 promotes castration-resistant prostate cancer progression

| PRJNA311372 | ENA