Diagnostic Microdosing Approach to Study Gemcitabine Resistance
- Univ. of California Davis, Sacramento, CA (United States). Dept. of Internal Medicine. Division of Hematology and Oncology
- Univ. of California Davis, Sacramento, CA (United States). Dept. of Internal Medicine. Division of Hematology and Oncology; Accelerated Medical Diagnostics Incorporated, Berkeley, CA (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Biosciences and Biotechnology Division
- Accelerated Medical Diagnostics Incorporated, Berkeley, CA (United States)
- Univ. of California Davis Medical Center, Sacramento, CA (United States). Dept. of Urology
Gemcitabine metabolites cause the termination of DNA replication and induction of apoptosis. In this paper, we determined whether subtherapeutic “microdoses” of gemcitabine are incorporated into DNA at levels that correlate to drug cytotoxicity. A pair of nearly isogenic bladder cancer cell lines differing in resistance to several chemotherapy drugs were treated with various concentrations of 14C-labeled gemcitabine for 4–24 h. Drug incorporation into DNA was determined by accelerator mass spectrometry. A mechanistic analysis determined that RRM2, a DNA synthesis protein and a known resistance factor, substantially mediated gemcitabine toxicity. Finally, these results support gemcitabine levels in DNA as a potential biomarker of drug cytotoxicity.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California Davis, Sacramento, CA (United States); Accelerated Medical Diagnostics Incorporated, Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE; National Inst. of Health (NIH) (United States); Dept. of Veterans Affairs (VA) (United States)
- Grant/Contract Number:
- AC52-07NA27344; RO1-CA155642; 5T32CA108459; 8P41GM103483; HHSN261201000133C; HHSN261201200048C; HHSN261201200084C; I01BX001784
- OSTI ID:
- 1438650
- Report Number(s):
- LLNL-JRNL-737043
- Journal Information:
- Chemical Research in Toxicology, Vol. 29, Issue 11; ISSN 0893-228X
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
DHS (trans−4,4′-dihydroxystilbene) suppresses DNA replication and tumor growth by inhibiting RRM2 (ribonucleotide reductase regulatory subunit M2)
|
journal | December 2018 |
Radiocarbon Tracers in Toxicology and Medicine: Recent Advances in Technology and Science
|
journal | May 2019 |
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