Abstract
The intracellular distribution of transition metals in V79 Chinese hamster lung cells treated with subtoxic doses of the organometallic anticancer complexes Cp2MCl2, where Cp is η 5 -cyclopentadienyl and M is Mo, Nb, Ti, or V, has been studied by synchrotron-based X-ray fluorescence (XRF). While significantly higher concentrations of Mo and Nb were found in treated cells compared with control cells, distinct differences in the cellular distribution of each metal were observed. Analysis of thin sections of cells was consistent with some localization of Mo in the nucleus. Studies with a noncytotoxic thiol derivative of molybdocene dichloride showed an uneven distribution of Mo in the cells. For comparison, the low levels of Ti and V in cells treated with the more toxic titanocene and vanadocene complexes, respectively, resulted in metal concentrations at the detection limit of XRF. The results agree with independent chemical studies that have concluded that the biological chemistry of each of the metallocene dihalides is unique.
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Abbreviations
- AAS:
-
Atomic absorption spectroscopy
- Cp:
-
η 5-Cyclopentadienyl
- EAT:
-
Erhlich ascites tumor
- GFAAS:
-
Graphite furnace atomic absorption spectroscopy
- ICP:
-
Inductively coupled plasma
- PBS:
-
Phosphate-buffered saline
- SRIXE:
-
Synchrotron-radiation-induced X-ray emission
- XRF:
-
X-ray fluorescence
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Acknowledgements
This work was supported by the Sydney University Cancer Research Fund and the Australian Synchrotron Research Program, which is funded by the Commonwealth of Australia under the Major National Research Facilities program. The use of APS facilities was supported by the US Department of Energy, Basic Energy Sciences, Office of Science, under contract no. W-31-109-Eng-38. J.B.W. gratefully acknowledges the receipt of an Australian Postgraduate Award. H.H.H. acknowledges support from an Australian Synchrotron Research Program Postdoctoral Fellowship.
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Waern, J.B., Harris, H.H., Lai, B. et al. Intracellular mapping of the distribution of metals derived from the antitumor metallocenes. J Biol Inorg Chem 10, 443–452 (2005). https://doi.org/10.1007/s00775-005-0649-1
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DOI: https://doi.org/10.1007/s00775-005-0649-1