Blocking lncRNA MALAT1/miR-199a/ZHX1 Axis Inhibits Glioblastoma Proliferation and Progression

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Zinc fingers and homeoboxes 1 (ZHX1) is a transcription repressor implicated in various tumor progressions.
• The role and regulatory mechanisms of ZHX1 in glioblastoma (GBM) remain unclear.
• Non-coding RNAs are recognized for their significant roles in glioma initiation and progression.

Purpose of the Study:

• To investigate the functional role of the metastasis-associated lung adenocarcinoma transcript-1 (MALAT1)/microRNA-199a (miR-199a)/ZHX1 axis in GBM.
• To elucidate the co-regulatory mechanisms of this axis in promoting glioma proliferation and progression.
• To assess the correlation between the MALAT1/miR-199a/ZHX1 axis and GBM patient survival.

Main Methods:

• Analysis of MALAT1/miR-199a/ZHX1 expression in glioma datasets and correlation with patient survival.
• In vitro and in vivo studies, including dual luciferase reporter assays, FISH, RNA immunoprecipitation, and pull-down experiments.
• Assessment of ZHX1's effect on apoptosis by evaluating Bax and Bcl-2 protein levels.
• Evaluation of MALAT1 knockdown effects on GBM proliferation, progression, tumor volume, and survival in an orthotopic GBM murine model.

Main Results:

• Elevated ZHX1 expression correlated with poor prognosis in GBM patients.
• ZHX1 attenuated GBM cell apoptosis by downregulating Bax and upregulating Bcl-2.
• MALAT1 knockdown inhibited GBM proliferation and progression in vitro, and reduced tumor volume and prolonged survival in vivo.
• MALAT1 was shown to promote ZHX1 expression by sponging miR-199a, acting as a competing endogenous RNA.

Conclusions:

• The MALAT1/miR-199a/ZHX1 axis promotes GBM cell proliferation and progression both in vitro and in vivo.
• The expression of this axis negatively correlates with GBM patient survival.
• Targeting the MALAT1/miR-199a/ZHX1 axis presents a potential novel therapeutic strategy for GBM treatment.