Optical and radioiodinated tethered Hsp90 inhibitors reveal selective internalization of ectopic Hsp90 in malignant breast tumor cells.
Published
Journal Article
Inhibitors of heat-shock protein 90 (Hsp90) have demonstrated an unusual selectivity for tumor cells despite its ubiquitous expression. This phenomenon has remained unexplained, but could be influenced by ectopically expressed Hsp90 in tumors. In this work, we synthesized Hsp90 inhibitors that can carry optical or radioiodinated probes via a polyethyleneglycol tether. We show that these tethered inhibitors selectively recognize cells expressing ectopic Hsp90 and become internalized. The internalization process is blocked by Hsp90 antibodies, suggesting that active cycling of the protein occurs at the plasma membrane. In mice, we observed exquisite accumulation of the fluor-tethered versions within breast tumors at very sensitive levels. Cell-based assays with the radiolabeled version showed picomolar detection in cells that express ectopic Hsp90. Our findings show that fluor-tethered or radiolabeled inhibitors that target ectopic Hsp90 can be used to detect breast cancer malignancies through noninvasive imaging.
Full Text
Duke Authors
- Hartman, Zachary Conrad
- Haystead, Timothy Arthur James
- Lyerly, Herbert Kim
- Osada, Takuya
- Ramanujam, Nimmi
- Vaidyanathan, Ganesan
- Zalutsky, Michael Rod
Cited Authors
- Barrott, JJ; Hughes, PF; Osada, T; Yang, X-Y; Hartman, ZC; Loiselle, DR; Spector, NL; Neckers, L; Rajaram, N; Hu, F; Ramanujam, N; Vaidyanathan, G; Zalutsky, MR; Lyerly, HK; Haystead, TA
Published Date
- September 19, 2013
Published In
Volume / Issue
- 20 / 9
Start / End Page
- 1187 - 1197
PubMed ID
- 24035283
Pubmed Central ID
- 24035283
Electronic International Standard Serial Number (EISSN)
- 1879-1301
Digital Object Identifier (DOI)
- 10.1016/j.chembiol.2013.08.004
Language
- eng
Conference Location
- United States