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A fluorescent Hsp90 probe demonstrates the unique association between extracellular Hsp90 and malignancy in vivo.

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ACS chemical biology. 2017 Jan 19;. doi: 10.1021/acschembio.7b00006
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A fluorescent Hsp90 probe demonstrates the unique association between extracellular Hsp90 and malignancy in vivo.
Crowe LB, Hughes PF, Alcorta DA, Osada T, Smith AP, Totzke J, Loiselle DR, Lutz ID, Gargesha M, Roy D, Roques J, Darr D, Lyerly HK, Spector NL, Haystead TA
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Abstract

Extracellular expression of heat shock protein 90 (eHsp90) by tumor cells is correlated with malignancy. Development of small molecule probes that can detect eHsp90 in vivo may therefore have utility in the early detection of malignancy. We synthesized a cell impermeable far-red fluorophore-tagged Hsp90 inhibitor to target eHsp90 in vivo. High resolution confocal and lattice light sheet microscopy show that probe-bound eHsp90 accumulates in punctate structures on the plasma membrane of breast tumor cells and is actively internalized. The extent of internalization correlates with tumor cell aggressiveness, and this process can be induced in benign cells by over-expressing p110HER2. Whole body cryoslicing, imaging and histology of flank and spontaneous tumor-bearing mice strongly suggests that eHsp90 expression and internalization is a phenomenon unique to tumor cells in vivo and may provide an 'Achilles heel' for the early diagnosis of metastatic disease and targeted drug delivery.

PMID: 28103010 [PubMed - indexed for MEDLINE]

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