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Methamphetamine-induced early increase of IL-6 and TNF-alpha mRNA expression in the mouse brain
Joana Gonçalves1, Tânia Martins, Raquel Ferreira
1Institute of Pharmacology and Therapeutics, and Biomedical Institute for Research in Light and Image, Faculty of Medicine, University of Coimbra, Coimbra, Portugal.
Abstract:
The mechanisms by which methamphetamine (METH) causes neurotoxicity are not well understood. Recent studies have suggested that METH-induced neuropathology may result from a multicellular response in which glial cells play a prominent role, and so it is plausible to suggest that cytokines may participate in the toxic effects of METH. Therefore, in the present work we evaluated the effect of an acute administration of METH (30 mg/kg in a single intraperitoneal injection) on the interleukin (IL)-1beta, IL-6, and tumor necrosis factor (TNF)-alpha mRNA expression levels in the hippocampus, frontal cortex, and striatum of mice. We observed that METH did not induce changes in the IL-1beta mRNA expression levels in both hippocampus and striatum, with immeasurable levels in the frontal cortex. Regarding IL-6, METH induced an increase in the expression levels of this cytokine in the hippocampus and striatum, 1 h and 30 min post injection, respectively. In the frontal cortex, the increase in IL-6 mRNA levels was more significant and remained high even after 2 h. Moreover, the expression levels of TNF-alpha were increased in both hippocampus and frontal cortex 30 min post METH administration, with immeasurable levels in the striatum. We conclude that the pro-inflammatory cytokines IL-6 and TNF-alpha rapidly increase after METH administration, providing a new insight for understanding the effect of this drug of abuse in the brain.
Insights
Methamphetamine (METH) rapidly increases pro-inflammatory cytokines interleukin-6 and tumor necrosis factor-alpha in the mouse brain. This suggests these cytokines play a role in METH
Area of Science:
- Neuroscience
- Toxicology
- Immunology
Background:
- Methamphetamine (METH) neurotoxicity mechanisms are unclear.
- Glial cells and cytokines may mediate METH's toxic effects.
Purpose of the Study:
- To investigate the impact of acute METH administration on specific cytokine mRNA expression in the mouse brain.
- To analyze changes in interleukin (IL)-1beta, IL-6, and tumor necrosis factor (TNF)-alpha mRNA levels in the hippocampus, frontal cortex, and striatum.
Main Methods:
- Acute administration of METH (30 mg/kg, intraperitoneal injection) to mice.
- Quantification of IL-1beta, IL-6, and TNF-alpha mRNA expression levels via RT-qPCR.
- Analysis of cytokine expression at various time points post-METH injection (30 min, 1 h, 2 h).
Main Results:
- METH did not alter IL-1beta mRNA levels in the hippocampus or striatum; levels were immeasurable in the frontal cortex.
- METH significantly increased IL-6 mRNA in the hippocampus (1 h) and striatum (30 min).
- Frontal cortex IL-6 mRNA levels increased significantly and remained elevated for over 2 hours.
- TNF-alpha mRNA levels increased in the hippocampus and frontal cortex within 30 minutes of METH administration; levels were immeasurable in the striatum.
Conclusions:
- Acute METH administration rapidly upregulates pro-inflammatory cytokines IL-6 and TNF-alpha in specific brain regions.
- These findings offer new insights into the neurotoxic effects of METH and the involvement of inflammatory pathways.
- Cytokine modulation represents a potential target for understanding and mitigating METH-induced brain damage.
