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NTRK2 splice variant, TrkB.T1, is the predominant isoform in gliomas and enhances gliomagenesis via PI3K signaling

ABSTRACT: Independent scientific achievements have led to the discovery of aberrant splicing patterns in oncogenesis while more recent advances have uncovered novel gene fusions involving NTRK2 in gliomas. The exploration of NTRK2 splice variants in normal and neoplastic brain provides an intersection of these two rapidly evolving fields – alternative splicing and NTRK2 involvement in brain tumors. Tropomyosin receptor B (TrkB), encoded by the NTRK2 gene, is known for critical roles in neuronal survival, differentiation, molecular properties associated with memory, and exhibits intricate splicing patterns. Here we show a novel role for a TrkB splice variant, TrkB.T1, in human glioma via NTRK2 transcript analyses and immunostaining using a novel antibody. TrkB.T1 enhances PDGF-driven gliomas in vivo, augments PDGF-induced Akt signaling in vitro, while next generation sequencing broadly implicates TrkB.T1 in the PI3K/Akt signaling cascade in a ligand independent fashion. NTRK2 appears to be a specific example that highlights the importance of expanding upon whole gene and gene fusion analyses to explore splice variants in basic and translational neuro-oncology research

ORGANISM(S): Homo sapiens

PROVIDER: GSE136868 | GEO | 2020/05/13

REPOSITORIES: GEO

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Project description:Background: TrkB-T1 is a BDNF receptor lacking a tyrosine kinase domain that is highly expressed in astrocytes and regulates BDNF-evoked calcium transients. Previous studies indicate that downregulation of TrkB-T1 in frontal cortex may be involved in neurobiological processes underlying suicide. Methods: In a microarray screening study (N=8), we interrogated all known microRNA in the frontal cortex of suicide completers with low expression of TrkB-T1 and normal controls. These findings were validated and followed up in a larger sample of cases and controls (N=55) Functional analyses included microRNA silencing, microRNA overexpression and luciferase assays to investigate specificity and to validate interactions between differentially expressed microRNA and TrkB-T1 Results: microRNAs Hsa-miR-185* and Hsa-miR-491-3p were upregulated in suicide completers with low expression of TrkB.T1 (Pnominal: 9.10-5 and 1.8.10-4 respectively; FDR-corrected p=0.031). Bioinformatic analyses revealed five putative binding sites for the DiGeorge syndrome linked microRNA Hsa-miR-185*in the 3M-bM-^@M-^YUTR of TrkB-T1, but none for Hsa-miR-491-3P. The increase of Hsa-miR-185* in frontal cortex of suicide completers was validated then confirmed in a larger, randomly selected group of suicide completers, where an inverse correlation between Hsa-miR-185* and TrkB-T1 expression was observed ( R=-0.404; p=0.002). Silencing and overexpression studies performed in human cell lines confirmed the inverse relationship between hsa-mir-185* and trkB-T1 expression. Luciferase assays demonstrated that Hsa-miR-185* binds to sequences in the 3M-bM-^@M-^YUTR of TrkB-T1. Conclusion: These results suggest that an increase of Hsa-miR-185* expression levels regulates, at least in part, the TrkB-T1 decrease observed in the frontal cortex of suicide completers and further implicate the 3MB 22q11 region in psychopathology. The microarray analysis consists in to compare the microRNA profile of four suicide completers with low TrkB-T1 expression level and four controls. Each RNA extract was labeled with Hy3 and hybridyzed with a reference sample labeled with Hy5. The reference sample was a pool of the eight RNA samples

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NTRK2 splice variant, TrkB.T1, is the predominant isoform in gliomas and enhances gliomagenesis via PI3K signaling

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