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The alternative splicing of intersectin 1 regulated by PTBP1 promotes human glioma progression
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The alternative splicing of intersectin 1 regulated by PTBP1 promotes human glioma progression
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Journal Article
The alternative splicing of intersectin 1 regulated by PTBP1 promotes human glioma progression
2022
Overview
Intersectin 1 (ITSN1) contains two isoforms: ITSN1-S and ITSN1-L, which are highly regulated by alternative splicing. Our previous results showed that the two isoforms of ITSN1 displayed opposite functions: ITSN1-S promoted glioma development, while ITSN1-L exerted an inhibitory role in glioma progression. In this study, our transcriptome analysis using a large glioma cohort indicated that the ratio of ITSN1-S/ITSN1-L was positively correlated with glioma grading and poor prognosis. We identified the RNA-binding protein polypyrimidine tract-binding protein 1 (PTBP1) as an
ITSN1
pre-mRNA interaction protein through RNA pull-down assay and RNA immunoprecipitation assay. Knockdown of PTBP1 decreased the ratio of ITSN1-S/ITSN1-L. Minigene reporter assay and mutation analyses further confirmed PTBP1 targeted polypyrimidine sequences on ITSN1 exon 30 (TTGCACTTCAGTATTTT) and promoted the inclusion of ITSN1 exon 30. Subsequently, silencing PTBP1 inhibited glioma cell proliferation, migration, and invasion by down-regulating the ratio of ITSN1-S/ITSN1-L. Taken together, our study provides a novel mechanism that PTBP1 modulates the alternative splicing of ITSN1 and promotes glioma proliferation and motility by up-regulating the ratio of ITSN1-S/ITSN1-L, thereby highlighting that PTBP1 may be an attractive therapeutic target for gliomas.
Publisher
Nature Publishing Group UK,Springer Nature B.V,Nature Publishing Group
Subject
/ 13/105
/ 13/109
/ 13/44
/ 13/51
/ 38/39
/ 38/77
/ 38/90
/ 64/60
/ 82/58
/ 82/80
/ Adaptor Proteins, Vesicular Transport
/ Alternative Splicing - genetics
/ Biomedical and Life Sciences
/ Glioma
/ Heterogeneous-Nuclear Ribonucleoproteins - genetics
/ Heterogeneous-Nuclear Ribonucleoproteins - metabolism
/ Humans
/ Isoforms
/ Polypyrimidine tract-binding protein
/ Polypyrimidine Tract-Binding Protein - genetics
/ Polypyrimidine Tract-Binding Protein - metabolism
/ Protein Isoforms - metabolism
/ Proteins
