Optical and radioiodinated tethered Hsp90 inhibitors reveal selective internalization of ectopic Hsp90 in malignant breast tumor cells.
Optical and radioiodinated tethered Hsp90 inhibitors reveal selective internalization of ectopic Hsp90 in malignant breast tumor cells.
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DOI:
10.1016/j.chembiol.2013.08.004
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发表时间:
2013-09-19
影响因子:
--
通讯作者:
Haystead TA
中科院分区:
文献类型:
--
作者:
Barrott JJ;Hughes PF;Osada T;Yang XY;Hartman ZC;Loiselle DR;Spector NL;Neckers L;Rajaram N;Hu F;Ramanujam N;Vaidyanathan G;Zalutsky MR;Lyerly HK;Haystead TA
Hsp90 inhibitors have demonstrated unusual selectivity for tumor cells despite its ubiquitous expression. This phenomenon has remained unexplained but could be influenced by ectopically expressed Hsp90 in tumors. We have synthesized novel Hsp90 inhibitors that can carry optical or radioiodinated probes via a PEG 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 is occurring at the plasma membrane. In mice, we show 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 targeting ectopic Hsp90 can be used to detect breast cancer malignancies through non-invasive imaging.
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DOI:
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发表时间:
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期刊:
Clinical cancer research : an official journal of the American Association for Cancer Research
影响因子:
--
作者:
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通讯作者:
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