Title
Pharmacodynamics of cisplatin in human head and neck cancer: correlation between platinum content, DNA adduct levels and drug sensitivity in vitro and in vivo
Author
Centraal Instituut voor Voedingsonderzoek TNO TNO Voeding
Welters, M.J.P.
Fichtinger-Schepman, A.M.J.
Baan, R.A.
Jacobs-Bergmans, A.J.
Kegel, A.
van der Vijgh, W.J.F.
Braakhuis, B.J.M.
Publication year
1999
Abstract
Total platinum contents and cisplatin-DNA adduct levels were determined in vivo in xenografted tumour tissues in mice and in vitro in cultured tumour cells of head and neck squamous cell carcinoma (HNSCC), and correlated with sensitivity to cisplatin. In vivo, a panel of five HNSCC tumour lines growing as xenografts in nude mice was used. In vitro, the panel consisted of five HNSCC cell lines, of which four had an in vivo equivalent. Sensitivity to cisplatin varied three- to sevenfold among cell lines and tumours respectively. However, the ranking of the sensitivities of the tumour lines (in vivo), also after reinjection of the cultured tumour cells, did not coincide with that of the corresponding cell lines, which showed that cell culture systems are not representative for the in vivo situation. Both in vitro and in vivo, however, significant correlations were found between total platinum levels, measured by atomic absorption spectrophotometry (AAS), and tumour response to cisplatin therapy at all time points tested. The levels of the two major cisplatin-DNA adduct types were determined by a recently developed and improved 32P post-labelling assay at various time points after cisplatin treatment. Evidence is presented that the platinum-AG adduct, in which platinum is bound to guanine and an adjacent adenine, may be the cytotoxic lesion because a significant correlation was found between the platinum-AG levels and the sensitivities in our panel of HNSCC, in vitro as well as in vivo. This correlation with the platinum-AG levels was established at 1 h (in vitro) and 3 h (in vivo) after the start of the cisplatin treatment, which emphasizes the importance of early sampling.
Subject
Cisplatin
Cisplatin sensitivity
DNA adducts
Head and neck cancer
Platinum accumulation
DNA
Phosphorus 32
Platinum
Animal experiment
Animal tissue
Atomic absorption spectrometry
Cancer cell culture
Controlled study
DNA drug complex
Drug sensitivity
Human cell
Intravenous drug administration
Mouse
Nonhuman
Nude mouse
Pharmacodynamics
Radioassay
Squamous cell carcinoma
Tumor xenograft
Animals
Antineoplastic Agents
Carcinoma, Squamous Cell
Drug Screening Assays, Antitumor
Female
Head and Neck Neoplasms
Humans
Mice
Mice, Nude
Neoplasm Transplantation
Tumor Cells, Cultured
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DOI
https://doi.org/10.1038/sj.bjc.6690015
TNO identifier
86507
Source
British Journal of Cancer, 79 (79), 82-88
Document type
article