体内
内化
细胞外
热休克蛋白
恶性肿瘤
病理
生物
离体
共焦显微镜
Hsp90抑制剂
细胞生物学
荧光团
热休克蛋白90
癌症研究
细胞
荧光
医学
生物化学
量子力学
生物技术
物理
基因
作者
Lauren B. Crowe,Philip Hughes,David A. Alcorta,Takuya Osada,Aaron P. Smith,Juliane Totzke,David R. Loiselle,Isaac D. Lutz,Madhusudhana Gargesha,Debasish Roy,Jose Roques,David B. Darr,H. Kim Lyerly,Neil L. Spector,Timothy A.J. Haystead
标识
DOI:10.1021/acschembio.7b00006
摘要
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 overexpressing 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.
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