Dual specific STAT3/5 degraders effectively block acute myeloid leukemia and natural killer/T cell lymphoma
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PROVIDER: PRJNA1100503 | ENA |
REPOSITORIES: ENA
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Project description:The transcription factors STAT3, STAT5A and STAT5B steer hematopoiesis and immunity, but their enhanced expression and activation promotes acute myeloid leukemia (AML) or natural killer/T cell lymphoma (NKCL). Current therapeutic strategies focus on blocking upstream tyrosine kinases to inhibit STAT3/5, but these kinase blockers are not selective against STAT3/5 activation and frequent resistance causes relapse, emphasizing the need for STAT3/5 targeted therapy. We evaluated JPX‑0700 and JPX-0750 efficacy as dual STAT3/5 binding inhibitors promoting protein degradation. JPX‑0700/-0750 decreased the mRNA and protein levels of STAT3/5 targets involved in cancer survival, metabolism and cell cycle progression, exhibiting nanomolar to low micromolar efficacy. They induced cell death and growth arrest in both AML/NKCL cell lines and primary AML patient blasts. We found that both AML/NKCL cells hijack STAT3/5 signaling through either upstream activating mutations in kinases, activating mutations in STAT3, mutational loss of negative STAT regulators, or genetic gains in survival, proliferative or epigenetic-modifier STAT3/5 targets. This emphasizes a vicious cycle for proliferation and survival through STAT3/5. Both JPX-0700/-0750 treatment reduced leukemic cell growth in human AML or NKCL xenograft mouse models significantly, being well tolerated in mice. Synergistic cell death was induced upon combinatorial use with approved chemotherapeutics in AML/NKCL cells.
2024-12-10 | GSE263984 | GEO
Project description:Many patients have cancers that have increased activity of a protein called STAT3 that contributes critically to the development and growth of their cancer. Despite our knowledge of STAT3’s importance to cancer, scientists and doctors have not developed a drug that targets it and that patients can take to treat their cancer more effectively than treatments that are now available. Tvardi Therapeutics, Incorporated has developed a compound, TTI-101, which can be given by mouth and acts as a direct inhibitor of STAT3. Administration of TTI-101 to mice demonstrated that it blocked growth of cancers of the breast, head and neck, lung, and liver and it was safe when administered at high doses to mice, rats, and dogs. In this application, Tvardi is proposing to further develop TTI-101 for treatment of solid tumors for which the prognosis is dismal. The investigators will determine how safe it is when administered to patients with cancer, determine whether an adequate dose can be administered to patients with cancer that will block STAT3 in their cancer, and determine whether treatment with TTI-101 leads to reduced growth of their cancer.
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Project description:Activating mutations of STAT3 were frequently found in patients with natural killer/T-cell lymphoma (NKTL), suggesting that targeted inhibition of STAT3 is a potential therapeutic option for NKTL patients. Here, we have developed a novel and potent STAT3 inhibitor WB737 that directly binds to the STAT3-SH2 domain with high affinity. WB737 selectively inhibits cell growth of NKTL harbored STAT3 mutations through inducing apoptosis and blocking colony formation. Mechanistically, WB737 inhibits both canonical and non-canonical STAT3 signaling via suppression of STAT3 phosphorylation at Tyr705 and Ser727 sites, respectively. Moreover, the activity of WB737 has a more potent inhibition on STAT3 compared to Sttatic, resulting in a significant anti-tumor effect followed by almost complete tumor regression in a NKTL xenograft model harboring STAT3 activating mutation. Collectively, these findings provide a preclinical proof-of-concept for WB737 as a novel therapeutic strategy for the treatment of NKTL patients with STAT3-activating mutations.
2023-06-21 | GSE202944 | GEO
Project description:Combined MEK and JAK/STAT3 pathway inhibition effectively decreases medulloblastoma tumor progression.
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Project description:RNA sequencing was carried out to identify the signaling pathways and hallmarks that change following MEK and/or JAK/STAT3 pathway inhibition.
2022-07-04 | GSE165960 | GEO
Project description:Targeting canonical and non-canonical STAT3 signaling by WB737, a novel potent STAT3 inhibitor, in natural killer/T-cell lymphoma
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Project description:Bioavailability of electron acceptors is probably the most limiting factor in the restoration of anoxic, contaminated environments. The oxidation of contaminants such as aromatic hydrocarbons, particularly in aquifers, often depends on the reduction of ferric iron or sulphate. We have previously detected a highly active fringe zone beneath a toluene plume at a tar-oil contaminated aquifer in Germany, where a specialized community of contaminant degraders co-dominated by Desulfobulbaceae and Geobacteraceae had established. Although on-site geochemistry links degradation to sulphidogenic processes, dominating catabolic (benzylsuccinate synthase alpha-subunit, bssA) genes detected in situ appeared more related to those of Geobacter spp. Therefore, a stable isotope probing (SIP) incubation of sediment samples with 13C7-toluene and comparative electron acceptor amendment was performed. We introduce pyrosequencing of templates from SIP microcosms as a powerful new strategy in SIP gradient interpretation (Pyro-SIP). Our results reveal the central role of Desulfobulbaceae for sulphidogenic toluene degradation in situ, and affiliate the detected bssA genes to this lineage. This, and the absence of 13C-labelled DNA of Geobacter spp. in SIP gradients preclude their relevance as toluene degraders in situ. In contrast, Betaproteobacteria related to Georgfuchsia spp. became labelled under iron-reducing conditions. Furthermore, secondary toluene degraders belonging to the Peptococcaceae detected in both treatments suggest the possibility of functional redundancy amongst anaerobic toluene degraders on site. 2 samples examined from the different electron-acceptors (sulphate or ferric iron) incubates at the time point of maximal toluene degradation.
2011-03-18 | E-GEOD-25449 | biostudies-arrayexpress
Project description:Natural killer (NK) cells contribute to the development of obesity-associated insulin resistance. We demonstrate that in mice obesity promotes the expansion of interleukin-6 receptor (IL6Ra)-expressing NK cells, which also express a number of other myeloid lineage genes such as the colony-stimulating-factor 1 receptor (Csf1r). Selective ablation of Csf1r- expressing NK cells prevents obesity and insulin resistance. Moreover, conditional inactivation of IL6Ra or Stat3 in NK cells limits obesity-associated formation of myeloid signature NK cells, protects from obesity, insulin resistance and obesity-associated inflammation. Also in humans IL6Ra+ NK cells increase in obesity, correlate with markers of systemic low-grade inflammation and their gene expression profile overlaps with characteristic gene sets of NK cells in obese mice. Collectively, we demonstrate that obesity-associated inflammation and metabolic disturbances depend on IL-6/Stat3-dependent formation of distinct NK cells, which may provide a novel target for the treatment of obesity, metaflammation-associated pathologies and diabetes.
2017-07-05 | GSE99068 | GEO