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09:51
Methods for Analyzing the Impacts of Natural Uranium on In Vitro Osteoclastogenesis
Published on: January 30, 2018
Uranium induces apoptosis in lung epithelial cells.
Adaikkappan Periyakaruppan1, Shubhashish Sarkar, Prabakaran Ravichandran
1Environmental Toxicology Program, Department of Chemistry, Texas Southern University, Houston, TX 77004, USA.
Archives of Toxicology
|December 20, 2008
Summary
Uranyl acetate (UA) exposure induces oxidative stress and apoptosis in lung cells. Caspase inhibitors significantly reduced UA-induced apoptosis, revealing a key mechanism of uranium toxicity.
Area of Science:
- Environmental Toxicology
- Cell Biology
- Biochemistry
Background:
- Uranium, a naturally occurring radioactive material, poses health risks due to its toxicity.
- Inhalation of uranium, primarily from industrial and mining sources, can lead to lung accumulation.
- Previous research indicated antioxidant system responses to uranyl acetate (UA)-induced oxidative stress in rat lung epithelial (LE) cells.
Purpose of the Study:
- To investigate the cellular mechanisms of toxicity induced by different concentrations of uranyl acetate (UA) in rat lung epithelial (LE) cells.
- To elucidate the role of apoptosis and specific signaling pathways in UA-induced cellular damage.
- To determine the impact of UA exposure on caspase activity and mitochondrial integrity.
Main Methods:
- LE cells were treated with varying concentrations of UA (0.25, 0.5, and 1 mM).
- Assays were performed to measure caspase-3 and -8 activity, cytochrome-c levels in the cytosol, and mitochondrial membrane permeability.
- TUNEL assay was utilized to detect DNA fragmentation, and caspase inhibitors were employed to assess their protective effects.
Main Results:
- UA treatment resulted in a dose- and time-dependent increase in caspase-3 and -8 activity.
- Increased cytosolic cytochrome-c and altered mitochondrial membrane permeability were observed at higher UA concentrations.
- TUNEL assay confirmed DNA damage, and caspase inhibitors significantly attenuated UA-induced apoptosis.
Conclusions:
- Uranyl acetate induces apoptosis in lung epithelial cells through the activation of caspase-3 and -8.
- Mitochondrial pathway, involving cytochrome-c release, plays a critical role in UA-induced apoptosis.
- Targeting caspases may offer a therapeutic strategy against uranium-induced lung injury.
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