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Published on: August 2, 2021
Methamphetamine Causes Photoreceptor Cell Damage Through Promoting Polarization of Macrophages and Inducing
Aihui Zhang1, Laiwei Wu2,3, Zilin Chen3
11 Department of Ophthalmology, Liaocheng Brain Hospital affiliated to Liaocheng People's Hospital, Liaocheng, People's Republic of China.
Abstract:
Classically activated macrophages (M1) are proinflammatory effectors and closely related to the progression of neurotoxicity. As a powerful psychostimulant and addictive drug, methamphetamine (Meth) abuse could result in long-lasting abnormalities in retina. This study investigated the effect of Meth at nontoxic concentration on macrophage activation state and its resultant toxicity to photoreceptor cells. Results showed that cytotoxicity was caused by Meth on 661 W cells after coculturing with RAW264.7 macrophage. RAW264.7 cells tended to switch to the M1 phenotype, releasing more proinflammatory cytokines after treatment with Meth. Meth could also upregulate the M1-related gene and protein expression. Our study demonstrated that Meth promoted macrophage polarization from M0 to M1 and induced inflammatory response, providing the scientific rationale for the photoreceptor cell damage caused by the Meth abuse.
Insights
Methamphetamine (Meth) abuse promotes macrophage polarization to the M1 proinflammatory state, leading to photoreceptor cell damage in the retina. This study explains the inflammatory mechanism behind Meth-induced retinal toxicity.
Area of Science:
- Neuroscience
- Immunology
- Ophthalmology
Background:
- Classically activated macrophages (M1) are proinflammatory and linked to neurotoxicity.
- Methamphetamine (Meth) abuse can cause persistent retinal abnormalities.
Purpose of the Study:
- To investigate Meth's effect on macrophage activation and photoreceptor cell toxicity at non-toxic concentrations.
- To elucidate the role of macrophage polarization in Meth-induced retinal damage.
Main Methods:
- Coculturing RAW264.7 macrophages with 661W photoreceptor cells.
- Treating macrophages with Methamphetamine.
- Analyzing macrophage polarization markers (M1 phenotype, proinflammatory cytokines, gene/protein expression).
Main Results:
- Methamphetamine induced cytotoxicity in 661W cells when cocultured with RAW264.7 macrophages.
- Methamphetamine treatment shifted RAW264.7 cells towards the M1 macrophage phenotype.
- Methamphetamine upregulated M1-related gene and protein expression and increased proinflammatory cytokine release.
Conclusions:
- Methamphetamine promotes M0 to M1 macrophage polarization, triggering an inflammatory response.
- This Meth-induced inflammatory response provides a mechanism for photoreceptor cell damage in the retina.
- Findings offer a scientific basis for understanding Meth abuse-related retinal toxicity.
