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Published on: December 26, 2015
Protective Role of miR-3909 Against Propofol-Induced Neurotoxicity Through the Regulation of Polymerase I and
Xiangyu Lu1, Yuanzhu Li2, Haitao Lou3
1Surgical Anesthesia Center, Affiliated HongQi Hospital of Mudanjiang Medical University, Mudanjiang, China.
Abstract:
Propofol (PPF), a commonly employed clinical anesthetic, has elicited growing concern due to its associated neurotoxic effects. However, the functional role and mechanistic insights of microRNA-3909 (miR-3909) in PPF-induced neurotoxicity remain unexplored. This study sought to elucidate the expression of miR-3909 and its underlying molecular mechanisms in the context of PPF-induced neurotoxicity. An in vitro model of PPF neurotoxicity was established using SH-SY5Y cells (PPF-SH-SY5Y). Initial assessments via cell counting kit-8 (CCK-8) and reverse transcription-quantitative polymerase chain reaction (RT-qPCR) demonstrated that treatment with 50 µM PPF significantly reduced cell viability and downregulated miR-3909 expression. Subsequent functional assays revealed that overexpression of miR-3909 effectively alleviated PPF-induced neurotoxicity, as evidenced by enhanced cell viability, suppression of apoptosis, reduced lactate dehydrogenase (LDH) release, and decreased reactive oxygen species (ROS) levels. Mechanistic investigations, including a dual-luciferase reporter assay, validated that miR-3909 directly targets and negatively regulates the expression of polymerase I and transcript release factor (PTRF). Notably, PTRF was significantly upregulated in PPF-SH-SY5Y cells, and overexpression of PTRF substantially counteracted the neuroprotective effects mediated by miR-3909. Collectively, these findings indicate that miR-3909 alleviates propofol-induced neurotoxicity by targeting PTRF, thereby providing a potential therapeutic target for this condition.
Insights
MicroRNA-3909 (miR-3909) protects against propofol (PPF)-induced neurotoxicity by downregulating polymerase I and transcript release factor (PTRF). This discovery offers a potential therapeutic strategy for PPF neurotoxicity.
Area of Science:
- Neuroscience
- Molecular Biology
- Pharmacology
Background:
- Propofol (PPF) is a widely used anesthetic with known neurotoxic effects.
- The role of microRNA-3909 (miR-3909) in propofol-induced neurotoxicity is currently unknown.
- Understanding the molecular mechanisms underlying propofol neurotoxicity is crucial for developing interventions.
Purpose of the Study:
- To investigate the expression and function of miR-3909 in propofol-induced neurotoxicity.
- To elucidate the molecular targets and pathways involved in miR-3909's effect on neurotoxicity.
- To explore miR-3909 as a potential therapeutic target for propofol neurotoxicity.
Main Methods:
- An in vitro model of propofol neurotoxicity using SH-SY5Y cells was established.
- Cell viability was assessed using CCK-8 assays.
- Gene expression was quantified using RT-qPCR and dual-luciferase reporter assays.
- Apoptosis, LDH release, and ROS levels were measured to evaluate neurotoxicity.
Main Results:
- Propofol treatment reduced cell viability and downregulated miR-3909 expression.
- Overexpression of miR-3909 significantly protected against propofol-induced neurotoxicity, reducing apoptosis, LDH release, and ROS levels.
- miR-3909 was found to directly target and downregulate polymerase I and transcript release factor (PTRF).
- PTRF was upregulated in propofol-treated cells, and its overexpression counteracted the neuroprotective effects of miR-3909.
Conclusions:
- miR-3909 plays a protective role against propofol-induced neurotoxicity in vitro.
- The neuroprotective mechanism of miR-3909 involves the downregulation of PTRF.
- miR-3909 represents a promising therapeutic target for mitigating propofol-induced neurotoxicity.
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