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Depletion and Reconstitution of Macrophages in Mice
Published on: August 1, 2012
Arachidonic acid reverses microplastic-induced macrophage dysfunction in teleost fish
Yun-Chao Cao1, Yu-Qing Zhou2, Jia-Yao Wu3
1State Key Laboratory of Biocontrol, Guangdong Key Laboratory of Pharmaceutical Functional Genes, School of Life Sciences, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, People's Republic China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China; Department of Basic Medical Research, General Hospital of Southern Theater Command of PLA, Guangzhou 510000, China.
Polystyrene microplastics harm Nile tilapia immunity by damaging macrophages. Supplementing with arachidonic acid (AA) restored macrophage function, improved fish survival, and mitigated microplastic toxicity in aquaculture.
Area of Science:
- Aquaculture
- Immunology
- Environmental Toxicology
Background:
- Microplastic pollution is a growing concern in aquaculture.
- Polystyrene microplastics (PS) negatively impact fish immunity, especially macrophage function.
- Nile tilapia (Oreochromis niloticus) are crucial aquaculture species susceptible to immune disruption.
Purpose of the Study:
- To investigate the effects of PS microplastics on Nile tilapia macrophages.
- To explore metabolic interventions, specifically arachidonic acid (AA), to counteract PS-induced immunotoxicity.
- To assess the potential of AA as a dietary supplement to enhance fish health in contaminated environments.
Main Methods:
- Exposure of Nile tilapia to PS microplastics.
- Assessment of macrophage function (phagocytosis, cytokine expression, oxidative stress).
- Transcriptomic and metabolomic analyses to identify molecular mechanisms and key metabolites.
- Administration of exogenous AA to PS-exposed fish and evaluation of immune recovery and survival rates.
Main Results:
- PS exposure impaired tilapia macrophage phagocytosis, altered cytokine profiles, increased oxidative stress, and reduced T-cell proliferation.
- Transcriptomics revealed PS disrupted lysosomal pathways essential for bacterial killing.
- Metabolomics identified arachidonic acid (AA) as significantly suppressed; exogenous AA restored macrophage function, lysosomal integrity, and improved fish survival against Streptococcus agalactiae infection.
Conclusions:
- Arachidonic acid (AA) effectively reverses polystyrene microplastic-induced macrophage dysfunction and lysosomal impairment in Nile tilapia.
- AA holds promise as a dietary supplement to mitigate microplastic immunotoxicity in aquaculture.
- Restoring macrophage function via AA supplementation can enhance fish resilience to bacterial infections in microplastic-contaminated waters.
