Browse
Submit Data
Databases
API
Help

Dataset Information

0 Views

0 Connections

0 Citations

0 Reanalyses

0 Downloads

Omics score: 0

Targeting PI3Kgamma dependency in leukemia treatment [PI3Kgamma inhibition]

ABSTRACT: Phosphoinositide 3-kinase gamma (PI3Kγ) is implicated as a target to repolarize tumor-associated macrophages and promote anti-tumor immune responses in solid cancers. However, cancer cell-intrinsic roles of PI3Kγ are unclear. Here, by integrating unbiased genome-wide CRISPR interference screening with functional analyses across acute leukemias, we define a selective dependency on the PI3Kγ complex in a high-risk subset that includes myeloid, lymphoid, and dendritic lineages. This dependency is characterized by innate inflammatory signaling and elevation of PIK3R5, which encodes a regulatory subunit of PI3Kγ that we find stabilizes the active enzymatic complex when overexpressed. Mechanistically, we identify PAK1 as a noncanonical substrate of PI3Kγ that mediates this cell-intrinsic dependency independently of AKT. PI3Kγ inhibition dephosphorylates PAK1, activates a transcriptional network of NFκB-related tumor suppressor genes, and impairs mitochondrial oxidative phosphorylation. We find that treatment with the selective PI3Kγ inhibitor eganelisib is effective in leukemias with activated PIK3R5, either at baseline or by exogenous inflammatory stimulation. Notably, the combination of eganelisib and cytarabine prolongs survival over either agent alone, even in patient-derived leukemia xenografts with low baseline PIK3R5 expression, as residual leukemia cells after cytarabine treatment have elevated G protein-coupled purinergic receptor activity and PAK1 phosphorylation. Taken together, our study reveals acute leukemia dependency on a noncanonical PI3Kγ signaling pathway amenable to near-term evaluation in patients using inhibitors already in clinical development.

ORGANISM(S): Homo sapiens

PROVIDER: GSE243654 | GEO | 2024/03/18

REPOSITORIES: GEO

ACCESS DATA

Json Xml

Dataset's files

Source:

			Action	DRS
		Other

Items per page:

1 - 1 of 1

Similar Datasets

Targeting PI3Kgamma dependency in leukemia treatment [cytarabine persistence]

Project description:Phosphoinositide 3-kinase gamma (PI3Kγ) is implicated as a target to repolarize tumor-associated macrophages and promote anti-tumor immune responses in solid cancers. However, cancer cell-intrinsic roles of PI3Kγ are unclear. Here, by integrating unbiased genome-wide CRISPR interference screening with functional analyses across acute leukemias, we define a selective dependency on the PI3Kγ complex in a high-risk subset that includes myeloid, lymphoid, and dendritic lineages. This dependency is characterized by innate inflammatory signaling and elevation of PIK3R5, which encodes a regulatory subunit of PI3Kγ that we find stabilizes the active enzymatic complex when overexpressed. Mechanistically, we identify PAK1 as a noncanonical substrate of PI3Kγ that mediates this cell-intrinsic dependency independently of AKT. PI3Kγ inhibition dephosphorylates PAK1, activates a transcriptional network of NFκB-related tumor suppressor genes, and impairs mitochondrial oxidative phosphorylation. We find that treatment with the selective PI3Kγ inhibitor eganelisib is effective in leukemias with activated PIK3R5, either at baseline or by exogenous inflammatory stimulation. Notably, the combination of eganelisib and cytarabine prolongs survival over either agent alone, even in patient-derived leukemia xenografts with low baseline PIK3R5 expression, as residual leukemia cells after cytarabine treatment have elevated G protein-coupled purinergic receptor activity and PAK1 phosphorylation. Taken together, our study reveals acute leukemia dependency on a noncanonical PI3Kγ signaling pathway amenable to near-term evaluation in patients using inhibitors already in clinical development.

2024-03-18 | GSE243669 | GEO

Targeting PI3Kgamma dependency in leukemia treatment [ATAC-seq]

2024-03-18 | GSE243666 | GEO

Targetable leukemia dependency on noncanonical PI3Kγ signaling

Project description:Phosphoinositide 3-kinase gamma (PI3Kγ) is implicated as a target to repolarize tumor-associated macrophages and promote anti-tumor immune responses in solid cancers. However, cancer cell-intrinsic roles of PI3Kγ are unclear. Here, by integrating unbiased genome-wide CRISPR interference screening with functional analyses across acute leukemias, we define a selective dependency on the PI3Kγ complex in a high-risk subset that includes myeloid, lymphoid, and dendritic lineages. This dependency is characterized by innate inflammatory signaling and elevation of PIK3R5, which encodes a regulatory subunit of PI3Kγ that we find stabilizes the active enzymatic complex when overexpressed. Mechanistically, we identify PAK1 kinase as a noncanonical substrate of PI3Kγ that mediates this cell-intrinsic dependency independently of AKT. PI3Kγ inhibition dephosphorylates PAK1, activates a transcriptional network of NFκB-related tumor suppressor genes, and impairs mitochondrial oxidative phosphorylation. We find that treatment with the selective PI3Kγ inhibitor eganelisib is effective in leukemias with activated PIK3R5, either at baseline or by exogenous inflammatory stimulation. Notably, the combination of eganelisib and cytarabine prolongs survival over either agent alone, even in patient-derived leukemia xenografts with low baseline PIK3R5 expression, as residual leukemia cells after cytarabine treatment have elevated G protein-coupled purinergic receptor activity and PAK1 phosphorylation. Taken together, our study reveals acute leukemia dependency on a noncanonical PI3Kγ signaling pathway amenable to near-term evaluation in patients using inhibitors already in clinical development.

2024-03-19 | PXD045702 | Pride

Targeting PI3Kgamma dependency in leukemia treatment [cytarabine persistence]

Project description:Targeting PI3Kgamma dependency in leukemia treatment [cytarabine persistence]

| PRJNA1019362 | ENA

Effect of PI3Kgamma inhibition on inflammation in a mouse model of COVID-19

Project description:SARS-CoV-2 infections induce aberrant pulmonary and systemic inflammation, vascular leak, coagulation and fatal organ damage. To identify therapeutic strategies to suppress COVID-19-associated inflammation, we sequenced lung tissue from sham infected mice and mice infected with SARS-CoV-2 that were treated with the cancer therapeutic IPI-549 (eganelisib) or vehicle. IPI-549 suppressed signatuers of pulmonary inflammation and reduced signatures of lung damage. These studies demonstrate the essential role of myeloid cells and PI3Kγ in SARS-CoV-2 inflammatory disease and support the use of myeloid cell inhibitors such as IPI-549 to suppress inflammation and promote survival in pulmonary infections like SARS-CoV-2.

2023-04-30 | GSE229570 | GEO

Targeting PI3Kgamma dependency in leukemia treatment [PI3Kgamma inhibition]

Project description:Targeting PI3Kgamma dependency in leukemia treatment [PI3Kgamma inhibition]

| PRJNA1019338 | ENA

Targeting PI3Kgamma dependency in leukemia treatment

Project description:Targeting PI3Kgamma dependency in leukemia treatment

| PRJNA1019359 | ENA

Targeting PI3Kgamma dependency in leukemia treatment [ATAC-seq]

Project description:Targeting PI3Kgamma dependency in leukemia treatment [ATAC-seq]

| PRJNA1019355 | ENA

PAK1 is a Therapeutic Target in Acute Myeloid Leukemia and Myelodysplastic Syndrome

Project description:Poor clinical outcome of Acute Myeloid Leukemia (AML) and Myelodysplastic Syndrome (MDS) has been attributed to failure of current chemotherapeutic regimens to target leukemic stem cells. We recently identified p21-activated kinase (PAK1) as a downstream effector molecule of H2.0-like homeobox (HLX), a gene functionally relevant for AML pathogenesis. In this study, we find that inhibition of PAK1 activity by small molecule inhibitors or by RNA interference leads to profound leukemia-inhibitory effects both in vitro and in vivo. Inhibition of PAK1 induces differentiation and apoptosis of AML cells through downregulation of MYC oncogene and a core network of MYC target genes. Moreover, we find that PAK1 up-regulation occurs during disease progression and is relevant for patient survival in MDS. Importantly, we find that inhibition of PAK1 inhibits primary human leukemic cells including immature leukemic stem cell-enriched populations. Our studies highlight PAK1 as a novel target in AML and MDS, and support the use of PAK1 inhibitors as a therapeutic strategy in these diseases. To obtain insight into the molecular mechanism for the induction of apoptosis and differentiation resulting from PAK1 inhibition in AML, we performed gene expression microarrays following treatment with either IPA-3 or FRAX-597. RNA was isolated from THP-1 cells after 5 hours of treatment with IPA-3 (6 ug/mL), FRAX-597 (2 ug/mL) or an equal volume of DMSO using Trizol Reagent (Invitrogen).

2015-07-11 | E-GEOD-70791 | biostudies-arrayexpress

PAK1 is a Therapeutic Target in Acute Myeloid Leukemia and Myelodysplastic Syndrome

2015-07-11 | GSE70791 | GEO