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. 2000 Feb;82(4):931–936. doi: 10.1054/bjoc.1999.1021

In vivo inhibition of cysteine proteinases delays the onset of growth of human pancreatic cancer explants

C J F Van Noorden 1, T G N Jonges 2, L C Meade-Tollin 3, R E Smith 4, A Koehler 5
PMCID: PMC2374406  PMID: 10732768

Abstract

An animal model was used to study the effects of oral treatment with a small molecular selective inhibitor of cysteine proteinases, Z-Phe-Arg-fluoromethylketone (Z-Phe-Arg-FMK) on primary tumour development. Poorly differentiated rapidly growing and moderately differentiated slowly growing human pancreatic tumours were implanted in the neck of nude mice that were orally treated or not with the inhibitor. Growth rates of the tumours were determined during 38 days after implantation. The poorly differentiated tumours were not affected by treatment with the inhibitor. Development of the moderately differentiated tumours was inhibited significantly by Z-Phe-Arg-FMK treatment. Moreover, the amount of stroma was increased and the volume of cancer cells was reduced in the moderately differentiated tumours that had grown in the treated animals. Reduction in size of the tumours was not achieved by reduction in growth rate but in a delay of the onset of growth. It is concluded that cysteine proteinases play a transient role at the start of tumour development only when cancer cells are surrounded by stroma as was the case in the moderately differentiated but not in the poorly differentiated pancreatic tumours. However, this role of cysteine proteinases can easily be taken over by other proteinases. © 2000 Cancer Research Campaign

Keywords: proteinase, cysteine proteinases, proteinase inhibitor, pancreatic cancer, nude mice, in vivo

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Selected References

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