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[Cancer Research 61, 4003-4009, May 15, 2001]
© 2001 American Association for Cancer Research

Experimental Therapeutics

Inhibition of Signal Transduction by the Hsp90 Inhibitor 17-Allylamino-17-demethoxygeldanamycin Results in Cytostasis and Apoptosis1

Isabelle Hostein, David Robertson, Francesca DiStefano, Paul Workman2 and Paul Andrew Clarke

Cancer Research Campaign Centre for Cancer Therapeutics [I. H., F. D., P. W., P. A. C.] and Confocal Microscope Facility [D. R.], Institute of Cancer Research, Sutton, Surrey SM2 5NG, United Kingdom

17-Allylamino-17-demethoxygeldanamycin (17AAG) is a first-in-class heat shock protein 90 (Hsp90) molecular chaperone inhibitor to enter clinical trials. The downstream molecular and cellular consequences of Hsp90 inhibition are not well defined. 17AAG has shown activity against human colon cancer in cell culture and xenograft models. In this study, we demonstrated that in addition to depleting c-Raf-1 and inhibiting ERK-1/2 phosphorylation in human colon adenocarcinoma cells, 17AAG also depleted N-ras, Ki-ras, and c-Akt and inhibited phosphorylation of c-Akt. A consequence of these events was the induction of cell line-dependent cytostasis and apoptosis, although the latter did not result from dephosphorylation of proapoptotic Bad. One cell line, KM12, did not exhibit apoptosis and in contrast to the other cell lines overexpressed Bag-1, but did not express Bax. Taken together with other determinants of 17AAG sensitivity, these results should contribute to a more complete understanding of the molecular pharmacology of 17AAG, which in turn should aid the future rational clinical development and use of the drug in colon and other tumor types.




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