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Mechanism of tumor cell-induced T-cell apoptosis mediated by galectin-1.

Abstract：

:Galectin-1 (Gal-1) has been implicated in tumor progression partly via the induction of T-cell apoptosis. However the mechanism of Gal-1 induced T-cell death was mostly studied using recombinant, soluble Gal-1 producing controversial results. To explore the true mechanism of Gal-1 and hence tumor cell-induced T-cell death, we applied co-cultures of tumor cells and T-cells thus avoiding artificial circumstances generated using recombinant protein. T-cells died when co-cultured with Gal-1-expressing but survived with Gal-1 non-expressing tumor cells. Removing tumor cell surface Gal-1 or knocking down Gal-1 expression resulted in diminution of T-cell apoptosis. Gal-1 transgenic or soluble Gal-1 treated HeLa cells became cytotoxic. Stimulation of apoptosis required interaction between the tumor and T-cells, presence of p56lck and ZAP70, decrease of mitochondrial membrane potential and caspase activation. Hence tumor cell-derived Gal-1 might efficiently contribute to tumor self-defense. Moreover this system resolves the discrepancies obtained using recombinant Gal-1 in T-cell apoptosis studies.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Kovács-Sólyom F,Blaskó A,Fajka-Boja R,Katona RL,Végh L,Novák J,Szebeni GJ,Krenács L,Uher F,Tubak V,Kiss R,Monostori E

doi

10.1016/j.imlet.2009.10.003

subject

Has Abstract

pub_date

2010-01-04 00:00:00

pages

108-18

issue

2

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(09)00247-8

journal_volume

127

pub_type

杂志文章

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