Journal
BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS
Volume 1861, Issue 11, Pages 2652-2662Publisher
ELSEVIER
DOI: 10.1016/j.bbagen.2017.07.007
Keywords
Gliomas; Macrophage; Inflammation; Temozolomide; Chemoresistance; Purinergic system
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Funding
- Brazilian agency: Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq) [482055/2013-8, 310846/2014-5]
- Brazilian agency: Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Brazilian agency: Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (FAPERGS) [16/2551-0000265-7]
- Brazilian agency: Fundacao de Amparo a Pesquisa do Estado do Rio Grande do Sul (PRONEX) [16/2551-0000473-0]
- CAPES Master fellowship
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Background: Glioblastomas are the most devastating brain tumor characterized by chemoresistance development and poor prognosis. Macrophages are a component of tumor microenvironment related to glioma malignancy. The relation among inflammation, innate immunity and cancer is accepted; however, molecular and cellular mechanisms mediating this relation and chemoresistance remain unresolved. Objective: Here we evaluated whether glioma sensitive or resistant to temozolomide (TMZ) modulate macrophage polarization and inflammatory pathways associated. The impact of glioma-macrophage crosstalk on glioma proliferation was also investigated. Methods: GL261 glioma chemoresistance was developed by exposing cells to increasing TMZ concentrations over a period of 6 months. Mouse peritoneal macrophages were exposed to glioma-conditioned medium or co-cultured directly with glioma sensitive (GL) or chemoresistant (GLTMZ). Macrophage polarization, in vitro and in vivo glioma proliferation, redox parameters, ectonucleotidase activity and ATP cytotoxicity were performed. Results: GLTMZ cells were more effective than GL in induce M2-like macrophage polarization and in promote a strong immunosuppressive environment characterized by high IL-10 release and increased antioxidant potential, which may contribute to glioma chemoresistance and proliferation. Interestingly, macrophage-GLTMZ crosstalk enhanced in vitro and in vivo proliferation of chemoresistant cells, decreased ectonucleotidase activities, which was followed by increased macrophage sensitivity to ATP induced death. Conclusions: Results suggest a differential macrophage modulation by GLTMZ cells, which may favor the maintenance of immunosuppressive tumor microenvironment and glioma proliferation. General significance: The induction of immunosuppressive environment and macrophage education by chemoresistant gliomas may be important for tumor recovery after chemotherapy and could be considered to overcome chemoresistance development.
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