Abstract
Lead and mercury are the ubiquitous heavy metals triggering toxicity and initiating apoptosis in cells. Though the toxic effects of heavy metals on various organs are known, there is a paucity of information on the mechanisms that instigate the current study. A plausible role of phospholipid scramblase 3 (PLSCR3) in Pb2+ and Hg2+ induced apoptosis was investigated with human embryonic kidney (HEK 293) cells. After 12 h of exposure, ~30–40% of the cells were in the early stage of apoptosis with increased reactive oxygen species (ROS), decreased mitochondrial membrane potential, and increased intracellular calcium levels. Also, ~20% of the cardiolipin localized within the inner mitochondrial membrane was translocated to the outer mitochondrial membrane along with the mobilization of truncated Bid (t-Bid) to the mitochondria and cytochrome c from the mitochondria. The endogenous expression levels of PLSCR3, caspase 8, and caspase 3 were upregulated in Pb2+ and Hg2+ induced apoptosis. The activation and upregulation of PLSCR3 mediate CL translocation playing a potential role in initiating the heavy metal-induced apoptosis. Therefore, PLSCR3 could be the linker between mitochondria and heavy metal apoptosis.
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Authors acknowledge the Indian Institute of Technology Madras for facilities. SKP wishes to thank the Ministry of Human Resource Development (MHRD), Government of India, and Indian Institute of Technology Madras for fellowship. The authors wish to thank Mr. Praveen Kumar for his support in FACS data acquisition. The authors thank Prof. Suresh Kumar Rayala and Prof. Mukesh Doble IITM, for their generous donation of the cell lines and Bid antibody.
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SKP: Conceptualization, Methodology, Investigation, Validation, Formal analysis, Visualization, Writing—original draft, review & editing. SNG: Conceptualization, Supervision, Resources, Writing—review & editing.
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Palanirajan, S.K., Gummadi, S.N. Phospholipid scramblase 3: a latent mediator connecting mitochondria and heavy metal apoptosis. Cell Biochem Biophys 81, 443–458 (2023). https://doi.org/10.1007/s12013-023-01145-0
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DOI: https://doi.org/10.1007/s12013-023-01145-0