Related Experiment Video
Updated: Feb 20, 2026
Stereotactic Injection of MicroRNA-expressing Lentiviruses to the Mouse Hippocampus CA1 Region and Assessment of the Behavioral Outcome
Published on: June 10, 2013
Downregulation of microRNA-448 improves isoflurane-induced learning and memory impairment in rats
Qun Wu1, Qinxue Dai1, Liuming Jiang1
1Department of Anesthesiology, The First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang 325000, P.R. China.
Abstract:
The present study aimed to investigate the potential role of microRNA‑448 (miR‑448) in isoflurane-induced learning and memory impairment in rats. Sprague‑Dawley rats were used for the construction of isoflurane‑treated models. The Morris water maze test was used to evaluate the effects of isoflurane on rats regarding the following para-meters: Swimming speed, escape latency and time in original quadrant. Influences of isoflurane on neuron apoptosis and miR‑448 expression in rat hippocampus tissue were analyzed by flow cytometry and reverse transcription‑quantitative polymerase chain reaction, respectively. Furthermore, the effects of miR‑448 on the expression of cell apoptosis‑associated proteins were investigated by flow cytometry. The results demonstrated that isoflurane treatment induced higher escape latency and lower time spent in original quadrant compared with the control rats. In addition, isoflurane treatment induced neuron apoptosis and miR‑448 was highly expressed in the hippocampal tissue of isoflurane‑treated rats. Furthermore, Bcl‑x was significantly downregulated while caspase‑3 expression was upregulated by an miR‑448 inhibitor. Combined the results of the current study indicate that miR‑448 knockdown may have pivotal roles in improving isoflurane-induced learning and memory impairment via suppressing neuron apoptosis.
Insights
MicroRNA-448 (miR-448) plays a key role in isoflurane-induced learning and memory deficits in rats. Inhibiting miR-448 may improve memory function by reducing neuron apoptosis.
Area of Science:
- Neuroscience
- Molecular Biology
- Anesthesiology
Background:
- Anesthesia, particularly isoflurane, can cause cognitive impairment.
- MicroRNAs (miRNAs) are implicated in various neurological processes, including memory and apoptosis.
Purpose of the Study:
- To investigate the role of microRNA-448 (miR-448) in isoflurane-induced learning and memory impairment in a rat model.
- To explore the underlying mechanisms involving neuron apoptosis and specific protein expression.
Main Methods:
- Establishment of isoflurane-treated rat models.
- Behavioral assessment using the Morris water maze test.
- Analysis of neuron apoptosis via flow cytometry and miR-448 expression via RT-qPCR.
- Investigation of apoptosis-associated protein expression (Bcl-x, caspase-3).
Main Results:
- Isoflurane exposure significantly increased escape latency and decreased time in the original quadrant, indicating learning and memory impairment.
- Isoflurane treatment led to increased neuron apoptosis and elevated miR-448 expression in the hippocampus.
- miR-448 inhibition resulted in downregulation of Bcl-x and upregulation of caspase-3.
Conclusions:
- Isoflurane-induced learning and memory impairment in rats is associated with increased neuron apoptosis and elevated hippocampal miR-448 expression.
- miR-448 knockdown demonstrates a potential therapeutic strategy for mitigating isoflurane-induced cognitive deficits by suppressing neuron apoptosis.
More Related Videos
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs