Abstract
Autophagy plays a dynamic role in spermatozoa development during spermatogenesis. However, the disruption of autophagic flux induces cell death under metal toxicity and severe oxidative stress. Therefore, we hypothesized that cadmium-induced autophagy might be involved in this mechanism. To verify this hypothesis, we studied cadmium-induced cellular evidence of autophagic-associated spermiophagy within the testis. In the present study, treatment with cadmium caused nuclear depressive disorders and vacuolated mitochondrial damage of Sertoli cells. In addition, spermiophagy through the cellular evidence of spermatozoa phagocytosis, the high lysosomal activity (lysosome engulfment and phagolysosome), and autophagy activity (autolysosome and autophagosome) were observed in the Sertoli cells. The immunohistochemistry of lysosomal membrane protein (LAMP2) to target the phagocytosis of spermatozoa revealed that the immunoreactivity of LAMP2 was overstimulated in the luminal compartment of testis’s seminiferous tubules. In addition, the immunohistochemistry and immunofluorescence of autophagy-related protein and microtubule-associated light chain (LC3) results showed the strong immunoreactivity and immunosignaling of LC3 in the Sertoli cells of the testis. Moreover, cadmium caused the overactivation of the expression level of autophagy-related proteins, autophagy-related gene (ATG7), (ATG5), beclin1, LC3, sequestosome 1 (P62), and LAMP2 which were confirmed by western blotting. In summary, this study demonstrated that hazards related to cadmium-induced autophagic-associated spermiophagy with the disruption of autophagic flux, providing new insights into the toxicity of cadmium in mammals and representing a high risk to male fertility.
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The data sets collated or analyzed during the current study are accessible upon adequate request from the corresponding author.
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The National Natural Science Foundation (grant numbers 31702305, 31872533, and 32072933) and Jiangsu Higher Education Institutions Priority Academic Program Development (PAPD) supported this study.
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Zongping Liu and Hui Zou: data curation, original draft writing, review, and editing. Waseem Ali: original draft writing. Kai Deng and Yonggang Ma: validation and software. Jian Sun: investigation and visualization. Zongping Liu is responsible for conceptualization, methodology, and software development.
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Ali, W., Deng, K., Sun, J. et al. A new insight of cadmium-induced cellular evidence of autophagic-associated spermiophagy during spermatogenesis. Environ Sci Pollut Res 30, 101064–101074 (2023). https://doi.org/10.1007/s11356-023-29548-9
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DOI: https://doi.org/10.1007/s11356-023-29548-9