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α integrin targeting for radiosensitization of three-dimensionally grown human head and neck squamous cell carcinoma cells.

Abstract：

:Integrin cell adhesion molecules play a crucial role in tumor cell resistance to radio- and chemotherapy and are therefore considered attractive targets for cancer therapy. Here, we assessed the role of β1 integrin-interacting α integrin subunits in more physiological three-dimensional extracellular matrix grown head and neck squamous cell carcinoma (HNSCC) cell cultures for evaluating cytotoxic and radiosensitizing potential. α2, α3, α5 and α6 integrins, which are overexpressed in HNSCC according to Oncomine database analysis, were coprecipitated with β1 integrin. More potently than α2, α5 or α6 integrin inhibition, siRNA-based α3 integrin targeting resulted in reduced clonogenic cell survival, induced apoptosis and enhanced radiosensitivity. These events were associated with diminished phosphorylation of Akt, Cortactin and Paxillin. Cell line-dependently, simultaneous α3 and β1 integrin inhibition led to higher cytotoxicity and radiosensitization than α3 integrin blocking alone. Stable overexpression of wild-type and constitutively active forms of the integrin signaling mediator focal adhesion kinase (FAK) revealed FAK as a key determinant of α3 integrin depletion-mediated radiosensitization. Our findings show that α3 integrin is essentially involved in HNSCC cell radioresistance and critical for a modified cellular radiosensitivity along with β1 integrins.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Steglich A,Vehlow A,Eke I,Cordes N

doi

10.1016/j.canlet.2014.12.009

subject

Has Abstract

pub_date

2015-02-28 00:00:00

pages

542-8

issue

2

eissn

0304-3835

issn

1872-7980

pii

S0304-3835(14)00752-6

journal_volume

357

pub_type

杂志文章

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