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Published on: September 26, 2015
Transcriptomic Changes of Astrocytes in the Brain of Rats with Subacute METH Exposure
Tao Wang1, Sai-Qun Wu2, Xiao-Hui Tan1
1School of Forensic Medicine, Southern Medical University, Guangzhou 510515, China.
Objectives:
To study the transcriptomic changes of astrocytes in the brain of rats exposed to methamphetamine (METH) and its possible mechanism in neurotoxicity.
Methods:
The rats were intraperitoneally injected with METH (15 mg/kg) every 12 h for 8 times in total to establish the subacute rat model of METH. After the model was successfully established, the striatum was extracted, and astrocytes were separated by the magnetic bead method. Transcriptome sequencing was performed on selected astrocytes, and the differentially expressed genes were analyzed by gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis.
Results:
A total of 876 differentially expressed genes were obtained by transcriptome sequencing, including 321 up-regulated genes and 555 down-regulated genes. GO analysis revealed that differentially expressed genes were mainly concentrated in cell structure, biological process regulation, extracellular matrix and organelle functions. KEGG pathway enrichment analysis showed that steroids biosynthesis, fatty acid biosynthesis, peroxisome proliferators-activated receptor (PPAR), adenosine 5'-monophosphate-activated protein kinase (AMPK) and other signaling pathways were significantly changed.
Conclusions:
METH can cause structural changes of astrocytes through multiple targets, among which cellular structure, steroids biosynthesis and fatty acid biosynthesis may play an important role in nerve injury, providing a new idea for forensic identification of METH related death.
Insights
Methamphetamine (METH) exposure alters astrocyte gene expression, impacting cellular structure and biosynthesis pathways. These changes offer insights into METH-induced neurotoxicity and potential forensic applications.
Area of Science:
- Neuroscience
- Molecular Biology
- Toxicology
Background:
- Astrocytes play crucial roles in brain function and are vulnerable to drug-induced neurotoxicity.
- Methamphetamine (METH) is a potent psychostimulant with known neurotoxic effects.
Purpose of the Study:
- To investigate the transcriptomic alterations in astrocytes following subacute methamphetamine exposure in rats.
- To elucidate the molecular mechanisms underlying METH-induced astrocyte dysfunction and neurotoxicity.
Main Methods:
- Establishment of a subacute METH rat model (15 mg/kg, i.p., every 12h for 8 doses).
- Isolation of striatal astrocytes using magnetic bead separation.
- Transcriptome sequencing and subsequent Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis of differentially expressed genes.
Main Results:
- Identification of 876 differentially expressed genes (321 upregulated, 555 downregulated) in astrocytes after METH exposure.
- GO analysis highlighted significant changes in cell structure, biological process regulation, extracellular matrix, and organelle functions.
- KEGG analysis revealed alterations in key pathways including steroid biosynthesis, fatty acid biosynthesis, PPAR, and AMPK signaling.
Conclusions:
- Methamphetamine induces structural changes in astrocytes via multiple molecular targets.
- Steroid biosynthesis, fatty acid biosynthesis, and cellular structural modifications are implicated in METH-related neurotoxicity.
- Findings provide a novel perspective for the forensic identification of METH-associated fatalities.
