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A non-radioactive method for measuring Cu uptake in HepG2 cells
C Fosset1, B A McGaw, M D Reid
1The Rowett Research Institute, Bucksburn, Green Road, Aberdeen, Scotland AB21 9SB, UK.
Journal of Inorganic Biochemistry
|April 19, 2005
Summary
This study introduces a new method using stable copper isotopes and ICP-MS to measure copper uptake in HepG2 cells, overcoming limitations of radioactive isotopes. This technique offers a viable alternative for studying copper metabolism.
Area of Science:
- Biochemistry
- Cell Biology
- Analytical Chemistry
Background:
- Copper (Cu) uptake and metabolism studies traditionally rely on radioactive isotopes (64Cu, 67Cu), which have limitations due to availability and short half-lives.
- HepG2 cells, a liver cell line, are crucial for studying copper metabolism.
Purpose of the Study:
- To investigate an alternative method for studying copper uptake in HepG2 cells using natural stable isotopes.
- To overcome the limitations of radioactive copper isotopes in uptake experiments.
Main Methods:
- Utilized stable copper isotopes (63Cu and 65Cu) and inductively coupled plasma mass spectrometry (ICP-MS).
- Altered the natural 63Cu/65Cu ratio in HepG2 cells via long-term incubation with 63Cu.
- Measured copper concentration and isotope ratios over three weeks.
Main Results:
- Long-term incubation with 63Cu significantly increased copper concentration in HepG2 cells.
- The 63Cu/65Cu ratio in cells changed from 2.18 +/- 0.05 to 15.3 +/- 1.01 after three weeks.
- Copper uptake measurements using 65Cu were linear, temperature-dependent, and consistent with previous data.
Conclusions:
- Stable isotope ICP-MS provides a viable alternative technique for studying copper uptake in HepG2 cells.
- This method circumvents the limitations associated with radioactive copper isotopes.