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MicroRNAs: Novel Mechanism Involved in the Pathogenesis of Microwave Exposure on Rats' Hippocampus
Li Zhao1, Chengfeng Sun, Lu Xiong
1Department of Experimental Pathology, Beijing Institute of Radiation Medicine, 27 Taiping Road, Beijing, 100850, People's Republic of China.
Abstract:
Microwave-induced adverse health outcomes have been gaining much attention in recent years. The hippocampus is sensitive and vulnerable to microwave exposure. Studies from our group and others showed that microwave-induced structural and functional injury of hippocampus, accompanied with alteration of gene and protein expression. It has been demonstrated that microRNAs (miRNAs) were involved in the physiological and pathological processes of brain. In this study, the miRNAs expression profiles of microwave-exposed hippocampus were detected by microarray analysis and verified by real-time polymerase chain reaction (PCR). At 7 days after 30 mW/cm(2) microwave exposure, the expression of 12 miRNAs increased, while other 70 miRNAs decreased in rats' hippocampus. However, most of miRNAs restored to normal levels at 14 days after exposure, only two upregulated miRNAs and 14 downregulated miRNAs were detected. Gene transcription, neuroprotection and receptors function related target genes were predicated by miRDB, miRbase and miRanda. Moreover, these differentially expressed miRNAs were involved in brain-related signaling pathways, such as synaptic vesicle cycle, long-term depression, calcium signaling and neurotrophin signaling pathways. In conclusion, we successfully characterized the miRNA profiles in microwave-exposed hippocampus, and that will be helpful to clarify the molecular mechanism and provide potential therapeutic targets.
Insights
Microwave exposure alters microRNA (miRNA) expression in the rat hippocampus, affecting brain function. Most changes normalize by 14 days, but some miRNAs offer potential therapeutic targets for microwave-induced injury.
Area of Science:
- Neuroscience
- Molecular Biology
- Biophysics
Background:
- Microwave exposure is linked to adverse health effects, particularly impacting the hippocampus.
- Previous research indicates microwave-induced structural and functional brain injuries, with altered gene and protein expression.
- MicroRNAs (miRNAs) play crucial roles in brain physiological and pathological processes.
Purpose of the Study:
- To characterize miRNA expression profiles in the rat hippocampus following microwave exposure.
- To identify specific miRNAs and their target genes involved in microwave-induced brain changes.
- To explore potential molecular mechanisms and therapeutic targets for microwave-related neurological damage.
Main Methods:
- Microarray analysis to detect miRNA expression profiles in rat hippocampus after microwave exposure.
- Real-time polymerase chain reaction (PCR) to validate differentially expressed miRNAs.
- Bioinformatic prediction of miRNA target genes using miRDB, miRbase, and miRanda.
Main Results:
- At 7 days post-exposure (30 mW/cm(2)), 12 miRNAs were upregulated and 70 were downregulated in the hippocampus.
- By 14 days, most miRNA levels returned to normal, with only 2 upregulated and 14 downregulated miRNAs detected.
- Predicted target genes are associated with gene transcription, neuroprotection, receptor function, and key brain signaling pathways.
Conclusions:
- The study successfully characterized miRNA expression changes in the microwave-exposed hippocampus.
- Differentially expressed miRNAs are implicated in synaptic vesicle cycle, long-term depression, calcium, and neurotrophin signaling pathways.
- These findings provide insights into the molecular mechanisms of microwave neurotoxicity and suggest potential therapeutic targets.
