Abstract
Aluminum contamination is a growing environmental and public health concern, and aluminum testicular toxicity has been reported in male rats; however, the underlying mechanisms of this toxicity are unclear. The objective of this study was to investigate the effects of exposure to aluminum chloride (AlCl3) on alterations in the levels of sex hormones (testosterone [T], luteinizing hormone [LH], and follicle-stimulating hormone [FSH]) and testicular damage. Additionally, the mechanisms of toxicity in the testes of AlCl3-exposed rats were analyzed by proteomics. Three different concentrations of AlCl3 were administered to rats. The results demonstrated a decrease in T, LH, and FSH levels with increasing concentrations of AlCl3 exposure. HE staining results revealed that the spermatogenic cells in the AlCl3-exposed rats were widened, disorganized, or absent, with increased severe tissue destruction at higher concentrations of AlCl3 exposure. Kyoto Encyclopedia of Genes and Genomes (KEGG) and Gene Ontology (GO) enrichment analyses revealed that differentially expressed proteins (DEPs) after AlCl3 exposure were primarily associated with various metabolic processes, sperm fibrous sheath, calcium-dependent protein binding, oxidative phosphorylation, and ribosomes. Subsequently, DEPs from each group were subjected to protein-protein interaction (PPI) analysis followed by the screening of interactional key DEPs. Western blot experiments validated the proteomics data, revealing the downregulation of sperm-related DEPs (AKAP4, ODF1, and OAZ3) and upregulation of regulatory ribosome-associated protein (UBA52) and mitochondrial ribosomal protein (MRPL32). These findings provide a basis for studying the mechanism of testicular toxicity due to AlCl3 exposure.
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Funding
We thank the Guangxi Natural Science Foundation Project (2020GXNSFAA297257), Guangxi Science and Technology Program Project (21-220-22), Guangxi University Young and Middle-aged Teachers’ Basic Ability Improvement Project (2020KY13017), Guangxi Zhuang Autonomous Region Administration of Traditional Chinese Medicine Self-financing Scientific Research Project (GZZC2020248), and Guangxi Zhuang Autonomous Region Health and Health Commission Self-financing Scientific Research Course (Z20201416).
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Huixin Peng, Yanxin Huang, and Guangji Wei were responsible for experiment operation and paper writing; Yanfang Pang and Huixiong Yuan were responsible for animal feeding and modeling; Xiong Zou was responsible for partial data analysis; Wencheng Chen and Yu’an Xie were responsible for experiment design, paper writing guidance, overall framework construction, and project fund preparation.
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Peng, H., Huang, Y., Wei, G. et al. Testicular Toxicity in Rats Exposed to AlCl3: a Proteomics Study. Biol Trace Elem Res 202, 1084–1102 (2024). https://doi.org/10.1007/s12011-023-03745-6
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DOI: https://doi.org/10.1007/s12011-023-03745-6