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Distribution of cisplatin in bone marrow cells: quantitative X-ray imaging
R G Kirk1, M E Gates, C S Chang
1Department of Anatomy, West Virginia University Health Sciences Center, Morgantown 26506, USA.
Experimental and Molecular Pathology
|August 1, 1995
Summary
Cisplatin uptake in rabbit bone marrow cells is selective for early cells, accumulating in the cytoplasm. High cisplatin concentrations disrupt ion transport, causing potassium loss and sodium gain in mature cells.
Area of Science:
- Cell Biology
- Pharmacology
- Biophysics
Background:
- Cisplatin is a platinum-based chemotherapy drug.
- Understanding cisplatin distribution and cellular effects is crucial for cancer treatment.
- Previous methods for measuring drug distribution were limited.
Purpose of the Study:
- To measure the distribution of cisplatin in rabbit bone marrow cells.
- To investigate the drug's effect on cellular ion transport.
- To correlate cisplatin accumulation with cellular changes.
Main Methods:
- Freeze-dried cryosections of rabbit bone marrow cells.
- X-ray imaging to measure platinum distribution and elemental changes.
- Analysis of ion transport alterations (potassium, sodium, chloride).
Main Results:
- Cisplatin selectively accumulated in large, early bone marrow cells, not mature ones.
- Platinum was primarily found in the cytoplasm, unevenly distributed.
- High cisplatin levels led to cytoplasmic potassium loss and extracellular sodium/chloride gain.
- Initial drug accumulation did not immediately alter membrane permeability or the K/Na pump.
Conclusions:
- Cisplatin exhibits selective uptake in specific bone marrow cell populations.
- Significant platinum accumulation is required to induce ion transport disruptions.
- This study provides insights into cisplatin's mechanism of action at the cellular level.