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Selective intracellular beryllium localization in rat tissue by mass-resolved ion microprobe imaging
R Levi-Setti1, J P Berry, J M Chabala
1Enrico Fermi Institute, University of Chicago, IL 60637.
Biology of the Cell
|January 1, 1988
Summary
Beryllium accumulates in rat kidney and liver cells, specifically in cell nuclei and lysosomes. This imaging study reveals key distribution sites relevant to beryllium toxicity and carcinogenicity.
Area of Science:
- Toxicology
- Biomedical Imaging
- Cell Biology
Background:
- Beryllium compounds are known for their toxic and carcinogenic properties.
- Understanding the precise distribution of beryllium within organs is crucial for assessing its health risks.
Purpose of the Study:
- To locate and image beryllium absorption sites in rat kidneys and livers.
- To correlate beryllium distribution with cellular and subcellular structures.
- To provide insights into the mechanisms of beryllium toxicity.
Main Methods:
- Utilized a scanning ion microprobe with secondary ion mass spectrometry for high-resolution imaging (approx. 70 nm).
- Prepared embedded sections and lyophilized cryosections of rat organs after in vivo beryllium administration.
- Correlated beryllium distribution images with histological microstructure using CN- images.
Main Results:
- Beryllium was selectively concentrated in the nuclei of kidney proximal tubule cells.
- In the kidney, beryllium was also found in modified podocytes and mesangial cells.
- In the liver, beryllium localized to altered lysosomal structures and hepatocyte nuclei.
Conclusions:
- Beryllium exhibits specific intracellular localization patterns in the kidney and liver.
- These findings contribute to understanding beryllium's toxicological and carcinogenic potential.
- High-resolution imaging provides critical data for risk assessment of beryllium exposure.