Oncostatin-M differentially regulates mesenchymal and proneural signature genes in gliomas via STAT3 signaling.
Glioblastoma (GBM), the most malignant of the brain tumors is classified on the basis of molecular signature genes using TCGA data into four subtypes- classical, mesenchymal, proneural and neural. The mesenchymal phenotype is associated with greater aggressiveness and low survival in contrast to GBMs enriched with proneural genes. The proinflammatory cytokines secreted in the microenvironment of gliomas play a key role in tumor progression. The study focused on the role of Oncostatin-M (OSM), an IL-6 family cytokine in inducing mesenchymal properties in GBM. Analysis of TCGA and REMBRANDT data revealed that expression of OSMR but not IL-6R or LIFR is upregulated in GBM and has negative correlation with survival. Amongst the GBM subtypes, OSMR level was in the order of mesenchymal > classical > neural > proneural. TCGA data and RT-PCR analysis in primary cultures of low and high grade gliomas showed a positive correlation between OSMR and mesenchymal signature genes-YKL40/CHI3L1, fibronectin and vimentin and a negative correlation with proneural signature genes-DLL3, Olig2 and BCAN. OSM enhanced transcript and protein level of fibronectin and YKL-40 and reduced the expression of Olig2 and DLL3 in GBM cells. OSM-regulated mesenchymal phenotype was associated with enhanced MMP-9 activity, increased cell migration and invasion. Importantly, OSM induced mesenchymal markers and reduced proneural genes even in primary cultures of grade-III glioma cells. We conclude that OSM-mediated signaling contributes to aggressive nature associated with mesenchymal features via STAT3 signaling in glioma cells. The data suggest that OSMR can be explored as potential target for therapeutic intervention.
National Centre for Cell Science (NCCS), Pune, India.
Kumar
K
Natesh
Persistent Systems Ltd., Pune, India.
Dipali
D
Bhosale
Persistent Systems Ltd., Pune, India.
Aarti
A
Desai
National Centre for Cell Science (NCCS), Pune, India.
Goparaju
G
Chandrika
National Centre for Cell Science (NCCS), Pune, India.
Radha
R
Pujari
National Centre for Cell Science (NCCS), Pune, India.
Jayashree
J
Jagtap
Department of Neurosurgery, Cimet's Inamdar Multispeciality Hospital, Pune, India.
Ashish
A
Chugh
Department of Neurosurgery, D. Y. Patil Medical College, Pune, India.
Deepak
D
Ranade
National Centre for Cell Science (NCCS), Pune, India. Electronic address: padma@nccs.res.in.
Padma
P
Shastry
D015153:Blotting, Western; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D019084:Fluorescent Antibody Technique, Indirect; D005786:Gene Expression Regulation / Q000502:physiology; D005910:Glioma / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D053680:Leukemia Inhibitory Factor Receptor alpha Subunit / Q000235:genetics; D059630:Mesenchymal Stem Cells / Q000378:metabolism*; D053683:Oncostatin M / Q000502:physiology*; D010641:Phenotype; D060888:Real-Time Polymerase Chain Reaction / Q000379:methods; D019947:Receptors, Interleukin-6 / Q000235:genetics; D053677:Receptors, Oncostatin M / Q000235:genetics; D050796:STAT3 Transcription Factor / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
C507840:LIFR protein, human; D053680:Leukemia Inhibitory Factor Receptor alpha Subunit; D019947:Receptors, Interleukin-6; D053677:Receptors, Oncostatin M; D050796:STAT3 Transcription Factor; C494086:STAT3 protein, human; D053683:Oncostatin M