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07.05.2024 | Original Article

Inflammation mediated angiogenesis in chronic lymphocytic leukemia

verfasst von: Olivera Mitrović-Ajtić, Emilija Živković, Tijana Subotički, Miloš Diklić, Dragoslava Đikić, Milica Vukotić, Teodora Dragojević, Vojin Vuković, Darko Antić, Vladan P. Čokić

Erschienen in: Annals of Hematology

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Abstract

Chronic inflammation has been identified in leukemias as an essential regulator of angiogenesis. B-chronic lymphocytic leukemia (CLL) cells secrete high levels of vascular endothelial growth factor (VEGF) and hypoxia inducible factor 1 alpha (HIF1α). The aim was to assess the role of inflammation in activation of angiogenic factors: endothelial nitric oxide synthase (eNOS), HIF1α and VEGF via proliferation related signaling pathways and VEGF autocrine control. We isolated mononuclear cells (MNC) and CD19+ cells from peripheral blood of 60 patients with CLL. MNC were treated with pro-inflammatory interleukin-6 (IL-6) and VEGF, in combination with inhibitors of JAK1/2 (Ruxolitinib), mTOR (Rapamycin), NF-κB (JSH23), SMAD (LDN-193189) and PI3K/AKT (Ly294002) signaling pathways, to evaluate eNOS, VEGF and HIF1α expression by immunoblotting, immunocytochemistry and RT-qPCR. Also, we investigated IL-6 dependent neovascularization in human microvascular endothelial cells (HMEC-1) in co-culture with MNC of CLL. The angiogenic factors eNOS, VEGF and HIF1α had significantly higher frequencies in MNC of CLL in comparison to healthy controls (p < 0.001) and CD19+ cells of CLL. IL-6 increased the quantity of HIF1α (p < 0.05) and VEGF positive cells in the presence of JSH23 (p < 0.01). VEGF increased HIF1α (p < 0.05), and decreased eNOS gene expression (p < 0.01) in MNC of CLL. VEGF significantly (p < 0.001) increased the number of HIF1α positive MNC of CLL, prevented by inhibitors of JAK1/2, PI3K and mTOR signaling pathways. VEGF stimulation of SMAD (p < 0.05) and STAT5 (p < 0.01) signaling has been prevented by inhibitors of JAK1/2, mTOR, PI3K and SMAD signaling, individually (p < 0.01) or mutually (p < 0.001). Also, we showed that MNC of CLL and IL-6 individually stimulate neovascularization in co-culture with HMEC-1, without a cumulative effect. We demonstrated elevated angiogenic factors in CLL, while VEGF and IL-6 independently stimulated HIF1α. VEGF stimulation of HIF1α was mostly mTOR dependent, while IL-6 stimulation was NF-κB dependent.
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Metadaten
Titel
Inflammation mediated angiogenesis in chronic lymphocytic leukemia
verfasst von
Olivera Mitrović-Ajtić
Emilija Živković
Tijana Subotički
Miloš Diklić
Dragoslava Đikić
Milica Vukotić
Teodora Dragojević
Vojin Vuković
Darko Antić
Vladan P. Čokić
Publikationsdatum
07.05.2024
Verlag
Springer Berlin Heidelberg
Erschienen in
Annals of Hematology
Print ISSN: 0939-5555
Elektronische ISSN: 1432-0584
DOI
https://doi.org/10.1007/s00277-024-05781-1

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