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1.
Lancet Haematol ; 11(8): e567-e579, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38885672

ABSTRACT

BACKGROUND: Sovleplenib, a novel spleen tyrosine kinase (SYK) inhibitor, showed promising safety and activity in patients with primary immune thrombocytopenia in a phase 1b/2 trial. We aimed to evaluate the efficacy and safety of sovleplenib in patients with chronic primary immune thrombocytopenia. METHODS: This randomised, double-blind, placebo-controlled, phase 3 trial (ESLIM-01) was done in 34 clinical centres in China. Eligible patients, aged 18-75 years, had chronic primary immune thrombocytopenia, an Eastern Cooperative Oncology Group (ECOG) performance status of 0-1, and received one or more previous treatments. Patients were randomly assigned (2:1) to receive oral sovleplenib or placebo, 300 mg once daily, for 24 weeks. Randomisation was stratified by baseline platelet counts, previous splenectomy, and concomitant treatment for anti-immune thrombocytopenia at baseline. The primary endpoint was durable response rate (proportion of patients with a platelet count of ≥50 × 109/L on at least four of six scheduled visits between weeks 14 and 24, not affected by rescue treatment) assessed by intention-to-treat. The trial is registered with ClinicalTrials.gov, NCT05029635, and the extension, open-label phase is ongoing. FINDINGS: Between Sept 29, 2021, and Dec 31, 2022, 188 patients were randomly assigned to receive sovleplenib (n=126) or placebo (n=62). 124 (66%) were female, 64 (34%) were male, and all were of Asian ethnicity. Median previous lines of immune thrombocytopenia therapy were 4·0, and 134 (71%) of 188 patients had received previous thrombopoietin or thrombopoietin receptor agonist. The primary endpoint was met; durable response rate was 48% (61/126) with sovleplenib compared with zero with placebo (difference 48% [95% CI 40-57]; p<0·0001). The median time to response was 8 days with sovleplenib compared with 30 days with placebo. 125 (99%) of 126 patients in the sovleplenib group and 53 (85%) of 62 in the placebo group reported treatment-emergent adverse events (TEAEs), and most events were mild or moderate. Frequent TEAEs of grade 3 or higher for sovleplenib versus placebo were platelet count decreased (7% [9/126] vs 10% [6/62]), neutrophil count decreased (3% [4/126] vs 0% [0/62]), and hypertension (3% [4/126] vs 0% [0/62]). Incidences of serious TEAEs were 21% (26/126) in the sovleplenib group and 18% (11/62) in the placebo group. There were no deaths in the study. INTERPRETATION: Sovleplenib showed a clinically meaningful sustained platelet response in patients with chronic primary immune thrombocytopenia, with a tolerable safety profile and improvement in quality of life. Sovleplenib could be a potential treatment option for patients with immune thrombocytopenia who received one or more previous therapy. FUNDING: HUTCHMED and Science and Technology Commission of Shanghai Municipality.


Subject(s)
Purpura, Thrombocytopenic, Idiopathic , Humans , Middle Aged , Male , Female , Double-Blind Method , Adult , Purpura, Thrombocytopenic, Idiopathic/drug therapy , China , Aged , Treatment Outcome , Chronic Disease , Young Adult , Adolescent , Platelet Count , Syk Kinase/antagonists & inhibitors , Protein Kinase Inhibitors/therapeutic use , Protein Kinase Inhibitors/adverse effects
2.
J Biol Chem ; 300(7): 107517, 2024 Jul.
Article in English | MEDLINE | ID: mdl-38945448

ABSTRACT

Acute respiratory distress syndrome (ARDS) is a deadly clinical presentation in sepsis, COVID, and other lung disorders where vascular fluid leakage is a severe problem. Recent findings by Shadab et al. in the JBC show that a well-known player in immune function, Syk, also regulates vascular leakage in response to sepsis. An existing FDA-approved inhibitor of Syk, fostamatinib, prevents the vascular leakage and improves survival in a mouse sepsis model, providing promise for ARDS treatment in the clinic.


Subject(s)
Aminopyridines , Morpholines , Protein Kinase Inhibitors , Pyrimidines , Respiratory Distress Syndrome , Syk Kinase , Humans , Aminopyridines/therapeutic use , Morpholines/therapeutic use , Pyrimidines/therapeutic use , Syk Kinase/antagonists & inhibitors , Syk Kinase/metabolism , Respiratory Distress Syndrome/drug therapy , Animals , Mice , Protein Kinase Inhibitors/therapeutic use , Sepsis/drug therapy
3.
Blood ; 144(6): 646-656, 2024 Aug 08.
Article in English | MEDLINE | ID: mdl-38843478

ABSTRACT

ABSTRACT: Fostamatinib, a recently approved Syk inhibitor used in adult primary immune thrombocytopenia (ITP), has been shown to be safe and effective in this disorder. However, clinical trial results may not be similarly reproduced in clinical practice. Here, 138 patients with ITP (both primary and secondary) from 42 Spanish centers who had been treated with fostamatinib were evaluated prospectively and retrospectively. The median age of our cohort (55.8% women) was 66 years (interquartile range [IQR], 56-80). The median time since ITP diagnosis at fostamatinib initiation was 51 months (IQR, 10-166). The median number of therapies before fostamatinib initiation was 4 (IQR, 2-5), including eltrombopag (76.1%), romiplostim (57.2%), and IV immunoglobulins (44.2%). Fifty-eight patients (42.0%) had signs/symptoms of bleeding in the month before treatment initiation. Seventy-nine percent of patients responded to fostamatinib with 53.6% complete responses (platelet count > 100 × 109/L). Eighty-three patients (60.1%) received fostamatinib monotherapy, achieving a high response rate (85.4%). The proportion of time in response during the 27-month period examined was 83.3%. The median time to platelet response was 11 days (IQR, 7-21). Sixty-seven patients (48.5%) experienced adverse events, mainly grade 1 to 2; the commonest of which were diarrhea (n = 28) and hypertension (n = 21). One patient had deep venous thrombosis, and one patient developed acute myocardial infarction. Fostamatinib was shown to be effective with good safety profile in patients with primary and secondary ITP across a wide age spectrum in this real-world study.


Subject(s)
Aminopyridines , Morpholines , Oxazines , Purpura, Thrombocytopenic, Idiopathic , Pyridines , Pyrimidines , Humans , Female , Male , Middle Aged , Purpura, Thrombocytopenic, Idiopathic/drug therapy , Aged , Oxazines/therapeutic use , Oxazines/adverse effects , Aged, 80 and over , Pyrimidines/therapeutic use , Pyrimidines/adverse effects , Morpholines/therapeutic use , Morpholines/adverse effects , Pyridines/therapeutic use , Pyridines/adverse effects , Aminopyridines/therapeutic use , Aminopyridines/adverse effects , Retrospective Studies , Treatment Outcome , Syk Kinase/antagonists & inhibitors , Protein Kinase Inhibitors/therapeutic use , Protein Kinase Inhibitors/adverse effects , Platelet Count , Prospective Studies
4.
Cardiovasc Pathol ; 72: 107669, 2024.
Article in English | MEDLINE | ID: mdl-38866089

ABSTRACT

BACKGROUND: The activation of innate immunity may be involved in the development of Candida albicans-induced murine vasculitis, which resembles Kawasaki disease (KD) vasculitis. This study aimed to histologically clarify the time course of the development of vasculitis in this model in detail and to estimate the potential role of spleen tyrosine kinase (Syk) inhibitors in KD vasculitis. METHODS AND RESULTS: DBA/2 male mice were intraperitoneally injected with a vasculitis-inducing substance and treated with a Syk inhibitor (R788 or GS-9973). Systemic vasculitis, especially in the aortic annulus area, was histologically evaluated. Regarding lesions in the aortic annulus area, some mice in the untreated control group already showed initiation of vasculitis 1 day after the final injection of a vasculitis-inducing substance. The vasculitis expanded over time. Inflammation occurred more frequently at the aortic root than at the coronary artery. The distribution of inflammatory cells was limited to the intima, intima plus adventitia, or all layers. In the Syk inhibitor-treated groups, only one mouse had vasculitis at all observation periods. The severity and area of the vasculitis were reduced by both Syk inhibitors. CONCLUSION: Candida albicans-induced murine vasculitis may occur within 1 day after the injection of a vasculitis-inducing substance. Additionally, Syk inhibitors suppress murine vasculitis.


Subject(s)
Candida albicans , Disease Models, Animal , Mice, Inbred DBA , Protein Kinase Inhibitors , Syk Kinase , Animals , Syk Kinase/antagonists & inhibitors , Male , Protein Kinase Inhibitors/pharmacology , Vasculitis/pathology , Vasculitis/drug therapy , Vasculitis/chemically induced , Vasculitis/microbiology , Vasculitis/enzymology , Mucocutaneous Lymph Node Syndrome/drug therapy , Mucocutaneous Lymph Node Syndrome/pathology , Mucocutaneous Lymph Node Syndrome/enzymology , Mice , Aorta/pathology , Aorta/drug effects , Aorta/enzymology , Time Factors , Candidiasis/drug therapy , Candidiasis/pathology , Candidiasis/microbiology , Aminopyridines/pharmacology , Niacinamide/analogs & derivatives , Pyrimidines
5.
Sci Rep ; 14(1): 14109, 2024 06 19.
Article in English | MEDLINE | ID: mdl-38898080

ABSTRACT

Developing a reliable method to predict thrombocytopenia is imperative in drug discovery. Here, we establish an assay using a microphysiological system (MPS) to recapitulate the in-vivo mechanisms of platelet aggregation and adhesion. This assay highlights the role of shear stress on platelet aggregation and their interactions with vascular endothelial cells. Platelet aggregation induced by soluble collagen was detected under agitated, but not static, conditions using a plate shaker and gravity-driven flow using MPS. Notably, aggregates adhered on vascular endothelial cells under gravity-driven flow in the MPS, and this incident increased in a concentration-dependent manner. Upon comparing the soluble collagen-induced aggregation activity in platelet-rich plasma (PRP) and whole blood, remarkable platelet aggregate formation was observed at concentrations of 30 µg/mL and 3 µg/mL in PRP and whole blood, respectively. Moreover, ODN2395, an oligonucleotide, induced platelet aggregation and adhesion to vascular endothelial cells. SYK inhibition, which mediated thrombogenic activity via glycoprotein VI on platelets, ameliorated platelet aggregation in the system, demonstrating that the mechanism of platelet aggregation was induced by soluble collagen and oligonucleotide. Our evaluation system partially recapitulated the aggregation mechanisms in blood vessels and can contribute to the discovery of safe drugs to mitigate the risk of thrombocytopenia.


Subject(s)
Blood Platelets , Platelet Aggregation , Thrombocytopenia , Platelet Aggregation/drug effects , Humans , Thrombocytopenia/chemically induced , Blood Platelets/drug effects , Blood Platelets/metabolism , Collagen/metabolism , Collagen/pharmacology , Endothelial Cells/drug effects , Endothelial Cells/metabolism , Platelet Adhesiveness/drug effects , Syk Kinase/metabolism , Syk Kinase/antagonists & inhibitors , Platelet-Rich Plasma/metabolism , Human Umbilical Vein Endothelial Cells/drug effects , Microphysiological Systems
6.
Leukemia ; 38(8): 1742-1750, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38906964

ABSTRACT

Activated B-cell-like diffuse large B-cell lymphoma (ABC-DLBCL) is driven by aberrant activation of the B-cell receptor (BCR) and the TLR/MyD88 signaling pathways. The heat-shock protein HSP110 is a candidate for their regulation as it stabilizes MyD88. However, its role in overall BCR signaling remains unknown. Here, we used first-in-class HSP110 inhibitors to address this question. HSP110 inhibitors decreased the survival of several ABC-DLBCL cell lines in vitro and in vivo, and reduced the phosphorylation of BCR signaling kinases, including BTK and SYK. We identified an interaction between HSP110 and SYK and demonstrated that HSP110 promotes SYK phosphorylation. Finally, the combination of the HSP110 inhibitor with the PI3K inhibitor copanlisib decreases SYK/BTK and AKT phosphorylation synergistically, leading to suppression of tumor growth in cell line xenografts and strong reduction in patient-derived xenografts. In conclusion, by regulating the BCR/TLR signaling pathway, HSP110 inhibitors are potential drug candidates for ABC-DLBCL patients.


Subject(s)
HSP110 Heat-Shock Proteins , Lymphoma, Large B-Cell, Diffuse , Receptors, Antigen, B-Cell , Signal Transduction , Syk Kinase , Xenograft Model Antitumor Assays , Lymphoma, Large B-Cell, Diffuse/drug therapy , Lymphoma, Large B-Cell, Diffuse/metabolism , Lymphoma, Large B-Cell, Diffuse/pathology , Syk Kinase/antagonists & inhibitors , Syk Kinase/metabolism , Humans , Phosphorylation/drug effects , Animals , Mice , Receptors, Antigen, B-Cell/metabolism , Signal Transduction/drug effects , HSP110 Heat-Shock Proteins/metabolism , Pyrimidines/pharmacology , Cell Line, Tumor , Tumor Cells, Cultured , Mice, SCID , Quinazolines
8.
J Med Virol ; 96(5): e29678, 2024 May.
Article in English | MEDLINE | ID: mdl-38751128

ABSTRACT

Death due to severe influenza is usually a fatal complication of a dysregulated immune response more than the acute virulence of an infectious agent. Although spleen tyrosine kinase (SYK) as a critical immune signaling molecule and therapeutic target plays roles in airway inflammation and acute lung injury, the role of SYK in influenza virus infection is not clear. Here, we investigated the antiviral and anti-inflammatory effects of SYK inhibitor R406 on influenza infection through a coculture model of human alveolar epithelial (A549) and macrophage (THP-1) cell lines and mouse model. The results showed that R406 treatment increased the viability of A549 and decreased the pathogenicity and mortality of lethal influenza virus in mice with influenza A infection, decreased levels of intracellular signaling molecules under the condition of inflammation during influenza virus infection. Combination therapy with oseltamivir further ameliorated histopathological damage in the lungs of mice and further delayed the initial time to death compared with R406 treatment alone. This study demonstrated that phosphorylation of SYK is involved in the pathogenesis of influenza, and R406 has antiviral and anti-inflammatory effects on the treatment of the disease, which may be realized through multiple pathways, including the already reported SYK/STAT/IFNs-mediated antiviral pathway, as well as TNF-α/SYK- and SYK/Akt-based immunomodulation pathway.


Subject(s)
Anti-Inflammatory Agents , Antiviral Agents , Disease Models, Animal , Orthomyxoviridae Infections , Oxazines , Syk Kinase , Animals , Humans , Syk Kinase/antagonists & inhibitors , Mice , Antiviral Agents/pharmacology , Antiviral Agents/therapeutic use , Orthomyxoviridae Infections/drug therapy , Orthomyxoviridae Infections/immunology , Anti-Inflammatory Agents/pharmacology , Anti-Inflammatory Agents/therapeutic use , Oxazines/pharmacology , Oxazines/therapeutic use , Pyridines/pharmacology , Pyridines/therapeutic use , Imidazoles/pharmacology , Imidazoles/therapeutic use , Lung/pathology , Lung/virology , Lung/drug effects , Lung/immunology , A549 Cells , Influenza A virus/drug effects , Mice, Inbred BALB C , Oseltamivir/pharmacology , Oseltamivir/therapeutic use , Influenza, Human/drug therapy , Influenza, Human/immunology , THP-1 Cells , Female , Protein Kinase Inhibitors/pharmacology , Protein Kinase Inhibitors/therapeutic use
9.
SAR QSAR Environ Res ; 35(4): 325-342, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38690773

ABSTRACT

This study aims to comprehensively characterize 576 inhibitors targeting Spleen Tyrosine Kinase (SYK), a non-receptor tyrosine kinase primarily found in haematopoietic cells, with significant relevance to B-cell receptor function. The objective is to gain insights into the structural requirements essential for potent activity, with implications for various therapeutic applications. Through chemoinformatic analyses, we focus on exploring the chemical space, scaffold diversity, and structure-activity relationships (SAR). By leveraging ECFP4 and MACCS fingerprints, we elucidate the relationship between chemical compounds and visualize the network using RDKit and NetworkX platforms. Additionally, compound clustering and visualization of the associated chemical space aid in understanding overall diversity. The outcomes include identifying consensus diversity patterns to assess global chemical space diversity. Furthermore, incorporating pairwise activity differences enhances the activity landscape visualization, revealing heterogeneous SAR patterns. The dataset analysed in this work has three activity cliff generators, CHEMBL3415598, CHEMBL4780257, and CHEMBL3265037, compounds with high affinity to SYK are very similar to compounds analogues with reasonable potency differences. Overall, this study provides a critical analysis of SYK inhibitors, uncovering potential scaffolds and chemical moieties crucial for their activity, thereby advancing the understanding of their therapeutic potential.


Subject(s)
Protein Kinase Inhibitors , Syk Kinase , Syk Kinase/antagonists & inhibitors , Syk Kinase/metabolism , Protein Kinase Inhibitors/chemistry , Protein Kinase Inhibitors/pharmacology , Structure-Activity Relationship , Quantitative Structure-Activity Relationship
10.
Cell Biochem Funct ; 42(4): e4039, 2024 Jun.
Article in English | MEDLINE | ID: mdl-38751189

ABSTRACT

Platelet hyperreactivity contributes to the pathogenesis of COVID-19, which is associated with a hypercoagulability state and thrombosis disorder. It has been demonstrated that Vitamin D deficiency is associated with the severity of COVID-19 infection. Vitamin D supplement is widely used as a dietary supplement due to its safety and health benefits. In this study, we investigated the direct effects and underlying mechanisms of 1,25(OH)2D3 on platelet hyperreactivity induced by SRAS-CoV-2 spike protein via Western blot and platelet functional studies in vitro. Firstly, we found that 1,25(OH)2D3 attenuated platelet aggregation and Src-mediated signaling. We further observed that 1,25(OH)2D3 attenuated spike protein-potentiated platelet aggregation in vitro. Mechanistically, 1,25(OH)2D3 attenuated spike protein upregulated-integrin αIIbß3 outside-in signaling such as platelet spreading and the phosphorylation of ß3, c-Src and Syk. Moreover, using PP2, the Src family kinase inhibitor to abolish spike protein-stimulated platelet aggregation and integrin αIIbß3 outside-in signaling, the combination of PP2 and 1,25(OH)2D3 did not show additive inhibitory effects on spike protein-potentiated platelet aggregation and the phosphorylation of ß3, c-Src and Syk. Thus, our data suggest that 1,25(OH)2D3 attenuates platelet aggregation potentiated by spike protein via downregulating integrin αIIbß3 outside-in signaling.


Subject(s)
Platelet Aggregation , Platelet Glycoprotein GPIIb-IIIa Complex , Signal Transduction , Spike Glycoprotein, Coronavirus , Platelet Aggregation/drug effects , Platelet Glycoprotein GPIIb-IIIa Complex/metabolism , Platelet Glycoprotein GPIIb-IIIa Complex/antagonists & inhibitors , Spike Glycoprotein, Coronavirus/metabolism , Humans , Signal Transduction/drug effects , SARS-CoV-2/drug effects , COVID-19/metabolism , Blood Platelets/metabolism , Blood Platelets/drug effects , Calcitriol/pharmacology , src-Family Kinases/metabolism , src-Family Kinases/antagonists & inhibitors , Syk Kinase/metabolism , Syk Kinase/antagonists & inhibitors , Phosphorylation/drug effects , COVID-19 Drug Treatment
12.
Microbes Infect ; 26(5-6): 105353, 2024.
Article in English | MEDLINE | ID: mdl-38763478

ABSTRACT

The obligate intracellular parasite Leishmania binds several receptors to trigger uptake by phagocytic cells, ultimately resulting in visceral or cutaneous leishmaniasis. A series of signaling pathways in host cells, which are critical for establishment and persistence of infection, are activated during Leishmania internalization. Thus, preventing Leishmania uptake by phagocytes could be a novel therapeutic strategy for leishmaniasis. However, the host cellular machinery mediating promastigote and amastigote uptake is not well understood. Here, using small molecule inhibitors of Mitogen-activated protein/Extracellular signal regulated kinases (MAPK/ERK), we demonstrate that ERK1/2 mediates Leishmania amazonensis uptake and (to a lesser extent) phagocytosis of beads by macrophages. We find that inhibiting host MEK1/2 or ERK1/2 leads to inefficient amastigote uptake. Moreover, using inhibitors and primary macrophages lacking spleen tyrosine kinase (SYK) or Abl family kinases, we show that SYK and Abl family kinases mediate Raf, MEK, and ERK1/2 activity and are necessary for uptake. Finally, we demonstrate that trametinib, a MEK1/2 inhibitor used to treat cancer, reduces disease severity and parasite burden in Leishmania-infected mice, even if it is started after lesions develop. Our results show that maximal Leishmania infection requires MAPK/ERK and highlight potential for MAPK/ERK-mediated signaling pathways to be novel therapeutic targets for leishmaniasis.


Subject(s)
Macrophages , Animals , Macrophages/parasitology , Macrophages/metabolism , Macrophages/immunology , Mice , Phagocytosis , Pyridones/pharmacology , Leishmaniasis/parasitology , Leishmaniasis/immunology , Syk Kinase/metabolism , Syk Kinase/antagonists & inhibitors , MAP Kinase Signaling System , Mice, Inbred C57BL , Leishmania mexicana/enzymology , Leishmania , Leishmaniasis, Cutaneous/parasitology , Leishmaniasis, Cutaneous/metabolism , Leishmaniasis, Cutaneous/immunology , Leishmaniasis, Cutaneous/pathology , Pyrimidinones
13.
Drug Metab Dispos ; 52(7): 626-633, 2024 Jun 17.
Article in English | MEDLINE | ID: mdl-38684371

ABSTRACT

In vitro metabolism studies of the spleen tyrosine kinase inhibitors AZ-A and AZ-B identified four unusual metabolites. M1 (mass-to-charge ratio 411) was formed by both molecules and was common to several analogs (AZ-C to AZ-H) sharing the same core structure, appearing to derive from the complete loss of a pendent 3,4-diaminotetrahydropyran ring and pyrazole ring cleavage resulting in a nonobvious metabolite. M2-M4 were formed by AZ-A and a subset of the other compounds only and apparently resulted from a sequential loss of H2 from parent. Initial attempts to isolate M3 for identification were unsuccessful due to sample degradation, and it was subsequently found that M2 and M3 underwent sequential chemical degradation steps to M4. M4 was successfully isolated and shown by mass spectrometry and NMR spectroscopy to be a tricyclic species incorporating the pyrazole and the 3,4-diaminotetrahydropyran groups. We propose that this arises from an intramolecular reaction between the primary amine on the tetrahydropyran and a putative epoxide intermediate on the adjacent pyrazole ring, evidence for which was generated in a ß-mercaptoethanol-trapping experiment. The loss of the tetrahydropyran moiety observed in M1 was found to be enhanced in an analog that was unable to undergo the intramolecular reaction step, leading us to propose two possible reaction pathways originating from the reactive intermediate. Ultimately, we conclude that the apparently complex and unusual metabolism of this series of compounds likely resulted from a single metabolic activation step forming an epoxide intermediate, which subsequently underwent intramolecular rearrangement and/or chemical degradation to form the final observed products. SIGNIFICANCE STATEMENT: The current work provides an unusual biotransformation example showing the potential for intramolecular reactions and chemical degradation to give the appearance of complex metabolism arising from a single primary route of metabolism.


Subject(s)
Biotransformation , Protein-Tyrosine Kinases , Syk Kinase , Syk Kinase/metabolism , Syk Kinase/antagonists & inhibitors , Humans , Protein-Tyrosine Kinases/antagonists & inhibitors , Protein-Tyrosine Kinases/metabolism , Protein Kinase Inhibitors/metabolism , Microsomes, Liver/metabolism , Intracellular Signaling Peptides and Proteins/metabolism , Intracellular Signaling Peptides and Proteins/antagonists & inhibitors , Pyrazoles/metabolism
14.
Drug Resist Updat ; 74: 101085, 2024 May.
Article in English | MEDLINE | ID: mdl-38636338

ABSTRACT

Enhanced DNA repair is an important mechanism of inherent and acquired resistance to DNA targeted therapies, including poly ADP ribose polymerase (PARP) inhibition. Spleen associated tyrosine kinase (Syk) is a non-receptor tyrosine kinase acknowledged for its regulatory roles in immune cell function, cell adhesion, and vascular development. This study presents evidence indicating that Syk expression in high-grade serous ovarian cancer and triple-negative breast cancers promotes DNA double-strand break resection, homologous recombination (HR), and subsequent therapeutic resistance. Our investigations reveal that Syk is activated by ATM following DNA damage and is recruited to DNA double-strand breaks by NBS1. Once localized to the break site, Syk phosphorylates CtIP, a pivotal mediator of resection and HR, at Thr-847 to promote repair activity, particularly in Syk-expressing cancer cells. Inhibition of Syk or its genetic deletion impedes CtIP Thr-847 phosphorylation and overcomes the resistant phenotype. Collectively, our findings suggest a model wherein Syk fosters therapeutic resistance by promoting DNA resection and HR through a hitherto uncharacterized ATM-Syk-CtIP pathway. Moreover, Syk emerges as a promising tumor-specific target to sensitize Syk-expressing tumors to PARP inhibitors, radiation and other DNA-targeted therapies.


Subject(s)
DNA Breaks, Double-Stranded , Drug Resistance, Neoplasm , Homologous Recombination , Syk Kinase , Syk Kinase/metabolism , Syk Kinase/genetics , Syk Kinase/antagonists & inhibitors , Humans , DNA Breaks, Double-Stranded/drug effects , Female , Drug Resistance, Neoplasm/genetics , Drug Resistance, Neoplasm/drug effects , Phosphorylation , Poly(ADP-ribose) Polymerase Inhibitors/pharmacology , Poly(ADP-ribose) Polymerase Inhibitors/therapeutic use , Ovarian Neoplasms/drug therapy , Ovarian Neoplasms/genetics , Ovarian Neoplasms/pathology , DNA Repair/drug effects , Ataxia Telangiectasia Mutated Proteins/metabolism , Ataxia Telangiectasia Mutated Proteins/antagonists & inhibitors , Ataxia Telangiectasia Mutated Proteins/genetics , Triple Negative Breast Neoplasms/genetics , Triple Negative Breast Neoplasms/drug therapy , Triple Negative Breast Neoplasms/pathology , Animals , Cell Line, Tumor , DNA Damage/drug effects
15.
Brain Res ; 1834: 148907, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38570153

ABSTRACT

BACKGROUND: Traumatic brain injury (TBI), as a major public health problem, is characterized by high incidence rate, disability rate, and mortality rate. Neuroinflammation plays a crucial role in the pathogenesis of TBI. Triggering receptor expressed on myeloid cells-1 (TREM-1) is recognized as an amplifier of the inflammation in diseases of the central nervous system (CNS). However, the function of TREM-1 remains unclear post-TBI. This study aimed to investigate the function of TREM-1 in neuroinflammation induced by TBI. METHODS: Brain water content (BWC), modified neurological severity score (mNSS), and Morris Water Maze (MWM) were measured to evaluate the effect of TREM-1 inhibition on nervous system function and outcome after TBI. TREM-1 expression in vivo was evaluated by Western blotting. The cellular localization of TREM-1 in the damaged region was observed via immunofluorescence staining. We also conducted Western blotting to examine expression of SYK, p-SYK and other downstream proteins. RESULTS: We found that inhibition of TREM-1 reduced brain edema, decreased mNSS and improved neurobehavioral outcomes after TBI. It was further determined that TREM-1 was expressed on microglia and modulated subtype transition of microglia. Inhibition of TREM-1 alleviated neuroinflammation, which was associated with SYK/p38MAPK signaling pathway. CONCLUSIONS: These findings suggest that TREM-1 can be a potential clinical therapeutic target for alleviating neuroinflammation after TBI.


Subject(s)
Brain Injuries, Traumatic , Microglia , Neuroinflammatory Diseases , Syk Kinase , Triggering Receptor Expressed on Myeloid Cells-1 , p38 Mitogen-Activated Protein Kinases , Brain Injuries, Traumatic/metabolism , Brain Injuries, Traumatic/drug therapy , Animals , Triggering Receptor Expressed on Myeloid Cells-1/metabolism , Triggering Receptor Expressed on Myeloid Cells-1/antagonists & inhibitors , Microglia/metabolism , Microglia/drug effects , Syk Kinase/metabolism , Syk Kinase/antagonists & inhibitors , Male , Neuroinflammatory Diseases/metabolism , Neuroinflammatory Diseases/drug therapy , p38 Mitogen-Activated Protein Kinases/metabolism , Mice , Signal Transduction/drug effects , Brain Edema/metabolism , Brain Edema/drug therapy , MAP Kinase Signaling System/drug effects , MAP Kinase Signaling System/physiology , Mice, Inbred C57BL
16.
Zhongguo Shi Yan Xue Ye Xue Za Zhi ; 32(2): 643-646, 2024 Apr.
Article in Chinese | MEDLINE | ID: mdl-38660880

ABSTRACT

Chronic lymphocytic leukemia (CLL)/small lymphocytic lymphoma (SLL) is a relatively inert B lymphocyte proliferative disease. In recent years with the launch of new drugs, chemotherapy has been gradually replaced by targeted therapy, which significantly prolongs the survival of patients and reduces the side effects of treatment. At present, BTK inhibitors, PI3K inhibitors, spleen tyrosine kinase (SYK) inhibitors and BCL-2 inhibitors are the most studied targeted therapeutic drugs for CLL/SLL. This article reviews the research progress of different types of targeted therapeutic drugs in the treatment of CLL/SLL.


Subject(s)
Leukemia, Lymphocytic, Chronic, B-Cell , Humans , Leukemia, Lymphocytic, Chronic, B-Cell/drug therapy , Molecular Targeted Therapy , Syk Kinase/antagonists & inhibitors , Agammaglobulinaemia Tyrosine Kinase/antagonists & inhibitors , Proto-Oncogene Proteins c-bcl-2 , Protein Kinase Inhibitors/therapeutic use , Antineoplastic Agents/therapeutic use , Phosphoinositide-3 Kinase Inhibitors
17.
Toxicol Appl Pharmacol ; 485: 116911, 2024 Apr.
Article in English | MEDLINE | ID: mdl-38527694

ABSTRACT

The highly selective Spleen Tyrosine Kinase (SYK) inhibitors entospletinib and lanraplenib disrupt kinase activity and inhibit immune cell functions. They are developed for treatment of B-cell malignancies and autoimmunity diseases. The impact of P-gp/ABCB1 and BCRP/ABCG2 efflux transporters, OATP1a/1b uptake transporters and CYP3A drug-metabolizing enzymes on the oral pharmacokinetics of these drugs was assessed using mouse models. Entospletinib and lanraplenib were orally administered simultaneously at moderate dosages (10 mg/kg each) to female mice to assess the possibility of examining two structurally and mechanistically similar drugs at the same time, while reducing the number of experimental animals and sample-processing workload. The plasma pharmacokinetics of both drugs were not substantially restricted by Abcb1 or Abcg2. The brain-to-plasma ratios of entospletinib in Abcb1a/b-/-, Abcg2-/- and Abcb1a/b;Abcg2-/- mice were 1.7-, 1.8- and 2.9-fold higher, respectively, compared to those in wild-type mice. For lanraplenib these brain-to-plasma ratios were 3.0-, 1.3- and 10.4-fold higher, respectively. This transporter-mediated restriction of brain penetration for both drugs could be almost fully inhibited by coadministration of the dual ABCB1/ABCG2 inhibitor elacridar, without signs of acute toxicity. Oatp1a/b and human CYP3A4 did not seem to affect the pharmacokinetics of entospletinib and lanraplenib, but mouse Cyp3a may limit lanraplenib plasma exposure. Unexpectedly, entospletinib and lanraplenib increased each other's plasma exposure by 2.6- to 2.9-fold, indicating a significant drug-drug interaction. This interaction was, however, unlikely to be mediated through any of the studied transporters or CYP3A. The obtained insights may perhaps help to further improve the safety and efficacy of entospletinib and lanraplenib.


Subject(s)
ATP Binding Cassette Transporter, Subfamily G, Member 2 , Brain , Indazoles , Morpholines , Protein Kinase Inhibitors , Pyrazines , Animals , ATP Binding Cassette Transporter, Subfamily G, Member 2/metabolism , ATP Binding Cassette Transporter, Subfamily G, Member 2/antagonists & inhibitors , ATP Binding Cassette Transporter, Subfamily G, Member 2/genetics , Female , Mice , Protein Kinase Inhibitors/pharmacokinetics , Protein Kinase Inhibitors/pharmacology , Brain/metabolism , Brain/drug effects , Syk Kinase/antagonists & inhibitors , Syk Kinase/metabolism , Mice, Knockout , ATP Binding Cassette Transporter, Subfamily B/genetics , ATP Binding Cassette Transporter, Subfamily B/metabolism , ATP Binding Cassette Transporter, Subfamily B/antagonists & inhibitors , Mice, Inbred C57BL , Pyrimidines/pharmacokinetics , Pyrimidines/pharmacology , Administration, Oral
19.
Haematologica ; 109(7): 2165-2176, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38235512

ABSTRACT

Sovleplenib (HMPL-523) is a selective spleen tyrosine kinase (Syk) inhibitor with anti-tumor activity in preclinical models of B-cell malignancy. We conducted a dose-escalation and dose-expansion phase I study of sovleplenib in patients with relapsed/ refractory mature B-cell tumors. Dose escalation followed a 3+3 design; patients received oral sovleplenib (200-800 mg once daily [q.d.] or 200 mg twice daily [b.i.d.], 28-day cycles). During dose expansion, patients were enrolled into four cohorts per lymphoma classification and treated at the recommended phase II dose (RP2D) (clinicaltrials gov. Identifier: NCT02857998). Overall, 134 Chinese patients were enrolled (dose escalation, N=27; dose expansion, N=107). Five patients experienced dose-limiting toxicities: one each of amylase increased (200 mg q.d.), febrile neutropenia (800 mg q.d.), renal failure (800 mg q.d.), hyperuricemia and blood creatine phosphokinase increased (200 mg b.i.d.) and blood bilirubin increased and pneumonia (200 mg b.i.d.). RP2D was determined as 600 mg (>65 kg) or 400 mg (≤65 kg) q.d.. The primary efficacy end point of independent review committee-assessed objective response rate in indolent B-cell lymphoma was 50.8% (95% confidence interval: 37.5- 64.1) in 59 evaluable patients at RP2D (follicular lymphoma: 60.5%, marginal zone lymphoma: 28.6%, lymphoplasmacytic lymphoma/Waldenström macroglobulinemia, 0%). The most common (≥10% patients) grade ≥3 treatment-related adverse events in the dose-expansion phase were decreased neutrophil count (29.9%), pneumonia (12.1%) and decreased white blood cell count (11.2%). Pharmacokinetic exposures increased dose-proportionally with ascending dose levels from 200-800 mg, without observed saturation. Sovleplenib showed anti-tumor activity in relapsed/refractory B-cell lymphoma with acceptable safety. Further studies are warranted.


Subject(s)
Lymphoma, B-Cell , Protein Kinase Inhibitors , Syk Kinase , Humans , Middle Aged , Male , Female , Syk Kinase/antagonists & inhibitors , Aged , Adult , Lymphoma, B-Cell/drug therapy , Lymphoma, B-Cell/pathology , Protein Kinase Inhibitors/therapeutic use , Protein Kinase Inhibitors/administration & dosage , Protein Kinase Inhibitors/pharmacokinetics , Protein Kinase Inhibitors/adverse effects , Young Adult , Aged, 80 and over , Treatment Outcome , Drug Resistance, Neoplasm/drug effects , Maximum Tolerated Dose , Pyrazines/administration & dosage , Pyrazines/therapeutic use , Pyrazines/pharmacokinetics , Pyrazines/adverse effects , Recurrence , Antineoplastic Agents/therapeutic use , Antineoplastic Agents/pharmacokinetics , Antineoplastic Agents/administration & dosage , Antineoplastic Agents/adverse effects , Indazoles , Morpholines
20.
J Invest Dermatol ; 144(8): 1733-1742, 2024 Aug.
Article in English | MEDLINE | ID: mdl-38296021

ABSTRACT

Bullous pemphigoid (BP) is an autoantibody-mediated blistering skin disease characterized by local inflammation and dermal-epidermal separation, with no approved targeted therapy. The Syk tyrosine kinase is critical for various functions of the immune response. Second-generation Syk inhibitors such as entospletinib are currently being tested for hematological malignancies. Our aim was to test the effect of entospletinib in a fully human model system of BP. Incubating BP serum-treated human frozen skin sections with normal human granulocytes and fresh plasma triggered dermal-epidermal separation that was dependent on complement, NADPH oxidase, and protease activity. Entospletinib dramatically reduced dermal-epidermal separation with a half-maximal inhibitory concentration of ≈16 nM. Entospletinib also reduced ROS production, granule release, and spreading of human granulocytes plated on immobilized immune complexes consisting either of a generic antigen-antibody pair or of recombinant collagen type XVII (BPAg2) and BP serum components (supposedly autoantibodies). However, entospletinib did not affect the chemotactic migration of human granulocytes or their responses to nonphysiological stimulation by phorbol esters. Entospletinib had no effect on the survival of granulocytes either. Taken together, entospletinib abrogates dermal-epidermal separation, likely through inhibition of granulocyte responsiveness to deposited immune complexes. Entospletinib or other Syk inhibitors may provide therapeutic benefits in BP.


Subject(s)
Pemphigoid, Bullous , Syk Kinase , Humans , Syk Kinase/antagonists & inhibitors , Syk Kinase/metabolism , Pemphigoid, Bullous/drug therapy , Pemphigoid, Bullous/immunology , Pemphigoid, Bullous/pathology , Epidermis/drug effects , Epidermis/pathology , Epidermis/immunology , Pyrazines/pharmacology , Pyrazines/therapeutic use , Granulocytes/drug effects , Granulocytes/immunology , Granulocytes/metabolism , Dermis/pathology , Dermis/cytology , Protein-Tyrosine Kinases/antagonists & inhibitors , Protein-Tyrosine Kinases/metabolism , Collagen Type XVII , Autoantigens/immunology , Non-Fibrillar Collagens/immunology , Protein Kinase Inhibitors/pharmacology , Protein Kinase Inhibitors/therapeutic use , Imidazoles/pharmacology , Intracellular Signaling Peptides and Proteins/antagonists & inhibitors , Intracellular Signaling Peptides and Proteins/metabolism , Reactive Oxygen Species/metabolism , Indazoles , Morpholines
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