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Next Generation Thiazolyl Ketone Inhibitors of Cytosolic Phospholipase A2 α: from Synthesis to Chemotherapeutic Mechanism of Action

ABSTRACT: Eicosanoids participate in the pathologies of inflammation and carcinogenesis and limiting their production by inhibiting group IVA cytosolic phospholipase A2 (cPLA2α) is a potential approach to cancer treatment. Here we report the synthesis of a new generation of thiazolyl ketone inhibitors of cPLA2α starting from compound GK470 (AVX235), and the discovery of a more potent and selective lead, GK420 (AVX420), with significant chemotherapeutic properties. A cancer cell line screen revealed the selective growth inhibitory effects of AVX420 in acute leukemias, uncovering a novel function of cPLA2α to promote cancer cell survival during oxidative stress by epigenetic control of tumour suppressor gene transcription. Moreover, we showed that in sensitive cells, AVX420 increased intracellular reactive oxygen species (ROS) and instigated a transcriptional response resulting in cell death. Our study suggests AVX420 has the potential to treat acute leukemias, and other cancers with specific adaptations to a high ROS burden.

ORGANISM(S): Homo sapiens

PROVIDER: GSE251999 | GEO | 2024/11/19

REPOSITORIES: GEO

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Project description:The role of Group IVA cytosolic phospholipase A2 (cPLA2M-NM-1) activation in regulating macrophage transcriptional responses to Candida albicans infection was investigated. cPLA2M-NM-1 releases arachidonic acid for the production of eicosanoids. In mouse resident peritoneal macrophages, prostacyclin, prostaglandin E2 and leukotriene C4 were produced within minutes of C. albicans addition before cyclooxygenase 2 expression. The production of TNFa was lower in C. albicans-stimulated cPLA2a+/+ than cPLA2a-/- macrophages due to an autocrine effect of prostaglandins that increased cAMP to a greater extent in cPLA2a+/+ than cPLA2a-/- macrophages. For global insight, differential gene expression in C. albicans-stimulated cPLA2a+/+ and cPLA2a-/- macrophages (3 h) was compared by microarray. cPLA2M-NM-1+/+ macrophages expressed 86 genes at lower levels and 181 genes at higher levels than cPLA2M-NM-1-/- macrophages (M-bM-^IM-%2-fold, p<0.05 ). Several pro-inflammatory genes were expressed at lower levels (Tnfa, Cx3cl1, Cd40, Ifng, several IFNg-inducible GTPases, Ccl5, Csf1, Edn1, CxCr7, Irf1, Irf4, Akna). Genes that dampen inflammation (Socs3, Il10, Crem, Stat3, Thbd, Thbs1, Abca1) and genes involved in host defense (Gja1, Csf3, Trem1, Hdc) were expressed at higher levels in cPLA2a+/+ macrophages. Representative genes expressed lower in cPLA2a+/+ macrophages (Tnfa and Csf1) were increased by treatment with a prostacyclin receptor antagonist and protein kinase A inhibitor, whereas genes expressed at higher levels (Crem, Nr4a2, Il10, Csf3) were suppressed. The results suggest that C. albicans stimulates an autocrine loop in macrophages involving cPLA2a, cyclooxygenase 1-derived prostaglandins and increased cAMP that globally effects expression of genes involved in host defense and inflammation. Resident peritoneal macrophages from Group IVA cytosolic phospholipase A2 (cPLA2a) +/+ and -/- mice were stimulated with Candida albicans (m.o.i. 2) for 3 hours and RNA isolated to evaluate the role of cPLA2a-derived lipid mediators on gene expression. Three independent experiments were analyzed.

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Next Generation Thiazolyl Ketone Inhibitors of Cytosolic Phospholipase A2 α: from Synthesis to Chemotherapeutic Mechanism of Action

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