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Heat-shock protein 70-2 (HSP70-2) expression in bladder urothelial carcinoma is associated with tumour progression and promotes migration and invasion

Garg, Manoj and Kanojia, Deepika and Seth, Amlesh and Kumar, Rajive and Gupta, Anju and Surolia, Avadhesha and Suri, Anil (2010) Heat-shock protein 70-2 (HSP70-2) expression in bladder urothelial carcinoma is associated with tumour progression and promotes migration and invasion. In: European Journal of Cancer, 46 (1). pp. 207-215.

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Official URL: http://dx.doi.org/10.1016/j.ejca.2009.10.020


Purpose: Testis specific heat-shock protein 70-2 (HSP70-2), a member of HSP70 chaperone family, is essential for the growth of spermatocytes and cancer cells. We investigated the association of HSP70-2 expression with clinical behaviour and progression of urothelial carcinoma of bladder. Experimental design: We assessed the HSP70-2 expression by RT-PCR and HSP70-2 protein expression by immunofluorescence, flow cytometry, immunohistochemistry and Western blotting in urothelial carcinoma patient specimens and HTB-1, UMUC-3, HTB-9, HTB-2 and normal human urothelial cell lines. Further, to investigate the role of HSP70-2 in bladder tumour development, HSP70-2 was silenced in the high-grade invasive HTB-1 and UMUC-3 cells. The malignant properties of urothelial carcinoma cells were examined using colony formation, migration assay, invasion assay in vitro and tumour growth in vivo. Results: Our RT-PCR analysis and immunohistochemistry analysis revealed that HSP70-2 was expressed in both moderate to well-differentiated and high-grade invasive urothelial carcinoma cell lines studied and not in normal human urothelial cells. In consistence with these results, HSP70-2 expression was also observed in superficially invasive (70%) and muscle-invasive (90%) patient's tumours. Furthermore, HSP70-2 knockdown significantly suppressed cellular motility and invasion ability. An in vivo xenograft study showed that inhibition of HSP70-2 significantly suppressed tumour growth. Conclusions: In conclusion, our data suggest that the HSP70-2 expression is associated with early spread and progression of urothelial carcinoma of bladder cancer and that HSP70-2 can be the potential therapeutic target for bladder urothelial carcinoma. (C) 2009 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Publication: European Journal of Cancer
Publisher: Elsevier sci ltd
Additional Information: Copy right of this article belongs to Elsevier sci ltd.
Keywords: HSP70-2; Urothelial carcinoma; Early detection; Diagnosis; Gene silencing
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Date Deposited: 03 May 2010 09:07
Last Modified: 19 Sep 2010 06:01
URI: http://eprints.iisc.ac.in/id/eprint/27430

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