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Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
Up-regulating microRNA-214-3p relieves hypoxic-ischemic brain damage through inhibiting TXNIP expression
Miaoyu Zhang1, Haiyang Zhou2, Rongni He3
1Department of Neurology, The Second Clinical College of Southern Medical University, Guangzhou, 510280, Guangdong, China.
Abstract:
A list of microRNAs (miRs) has been referred to involve in the development of hypoxic-ischemic brain damage (HIBD). Based on that, we probed the concrete role of miR-214-3p regulating thioredoxin-interacting protein (TXNIP) in the illness. A neonatal HIBD mouse model was established using the Rice-Vannucci method, followed by measurements of miR-214-3p and TXNIP levels in brain tissues. After modeling, mice were given brain injection of the compounds that could alter miR-214-3p and TXNIP expression. Afterward, neurological function, neuronal inflammation, neuronal apoptosis, neuron morphology, and the number of Nissl body were assessed in HIBD mice. The binding of miR-214-3p to TXNIP was analyzed. Lower miR-214-3p and higher TXNIP were analyzed in brain tissues of mice with HIBD. Up-regulating miR-214-3p or depleting TXNIP improved neurological function, reduced neuronal inflammation and neuronal apoptosis, attenuated morphological damage of neurons, and increased the number of Nissl bodies in mice with HIBD. TXNIP was targeted by miR-214-3p and overexpressing TXNIP reversed the therapeutic effect of miR-214-3p on HIBD mice. It is noted that promotion of miR-214-3p relieves HIBD in mice through inhibiting TXNIP expression.
Insights
MicroRNA-214-3p (miR-214-3p) protects against hypoxic-ischemic brain damage (HIBD) by inhibiting thioredoxin-interacting protein (TXNIP). Upregulating miR-214-3p or reducing TXNIP improves neurological outcomes in HIBD mouse models.
Area of Science:
- Neuroscience
- Molecular Biology
- Biochemistry
Background:
- Hypoxic-ischemic brain damage (HIBD) is a significant cause of neonatal neurological impairment.
- MicroRNAs (miRs) are implicated in HIBD pathogenesis, but specific regulatory mechanisms require elucidation.
Purpose of the Study:
- To investigate the role of miR-214-3p in regulating thioredoxin-interacting protein (TXNIP) in the context of HIBD.
- To assess the therapeutic potential of modulating miR-214-3p and TXNIP levels in a neonatal HIBD mouse model.
Main Methods:
- Establishment of a neonatal HIBD mouse model using the Rice-Vannucci method.
- Measurement of miR-214-3p and TXNIP expression levels in brain tissues.
- Intervention via brain injection to alter miR-214-3p and TXNIP expression, followed by assessment of neurological function, inflammation, apoptosis, and neuronal morphology.
Main Results:
- Lower levels of miR-214-3p and higher levels of TXNIP were observed in HIBD mouse brains.
- Upregulating miR-214-3p or depleting TXNIP significantly improved neurological function, reduced inflammation and apoptosis, and preserved neuronal structure.
- TXNIP was confirmed as a direct target of miR-214-3p, and its overexpression counteracted the protective effects of miR-214-3p.
Conclusions:
- miR-214-3p exerts a protective effect against HIBD in mice.
- This neuroprotection is mediated through the inhibition of TXNIP expression.
- Targeting the miR-214-3p/TXNIP axis represents a potential therapeutic strategy for HIBD.
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