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Cadmium induced changes in cell organelles: an ultrastructural study using cadmium sensitive and resistant muntjac
M J Ord1, S D Bouffler, R Chibber
1Biology Department, Southampton University, United Kingdom.
Abstract:
A detailed electron microscopy study of cadmium sensitive and resistant muntjac fibroblast cell lines has identified a wide range of intracellular damage following exposure to cadmium. Damaged organelles included cell membrane, mitochondria, Golgi cisternae and tubular network, chromatin, nucleoli, microfilaments and ribosomes. Although cell membrane damage was generally the earliest indication of adverse cadmium action, particularly with continuous cadmium exposures, cells could tolerate extensive membrane loss. Mitochondrial distortion and some damage to Golgi was also tolerated. The turning point at which cadmium became lethal was generally marked by a cascade of events which included damage to both nuclear and cytoplasmic components. These results for fibroblasts are discussed and compared with damage reported in other types of cells.
Insights
Cadmium exposure causes widespread cell damage, affecting organelles from the cell membrane to the nucleus. Lethal effects occur when both nuclear and cytoplasmic components are damaged.
Area of Science:
- Cell Biology
- Toxicology
- Electron Microscopy
Background:
- Cadmium is a toxic heavy metal with known adverse effects on cellular function.
- Understanding the specific mechanisms of cadmium toxicity is crucial for risk assessment and mitigation.
Purpose of the Study:
- To investigate the ultrastructural effects of cadmium exposure on muntjac fibroblast cell lines.
- To identify the specific organelles affected by cadmium and determine the sequence of damage.
Main Methods:
- Utilized detailed electron microscopy to examine cadmium-exposed and control muntjac fibroblast cells.
- Compared cadmium-sensitive and cadmium-resistant cell lines to understand differential responses.
Main Results:
- Observed extensive intracellular damage, including to the cell membrane, mitochondria, Golgi apparatus, chromatin, nucleoli, microfilaments, and ribosomes.
- Cell membrane damage was an early indicator, but cells tolerated some loss; mitochondrial and Golgi damage were also partially tolerated.
- Cadmium-induced lethality was associated with a cascade of damage affecting both nuclear and cytoplasmic components.
Conclusions:
- Cadmium toxicity involves a broad spectrum of intracellular damage.
- The progression of damage, particularly to nuclear and cytoplasmic components, dictates cadmium's lethal outcome in fibroblasts.
