Soluble integrin ligands and growth factors independently rescue neuroblastoma cells from apoptosis under nonadherent conditions

Experimental Cell Research
Chiarella BozzoF Altruda

Abstract

We have investigated the role of extracellular matrix (ECM) and growth factors in the survival of nonadherent human neuroblastoma cells (line SK-N-BE). Cells cultured in serum-free medium under nonadherent conditions died with apoptotic-like features (chromatin condensation and nuclear fragmentation). SK-N-BE cells underwent neuronal differentiation in response to retinoic acid (RA). While RA itself did not induce apoptosis, differentiation increased the susceptibility of SK-N-BE cells to detachment-induced apoptosis. The appearance of the apoptotic-like phenotype required the maintenance in suspension of SK-N-BE cells for at least 16 h (12.43 +/- 1.40% of cells undergoing apoptosis) and the percentage increased up to 46.84 +/- 3.15% after 24 h. Suspension-induced apoptosis did not depend on increased intracellular Ca2+ levels nor on de novo protein synthesis and was not associated with extensive DNA degradation. Stimulation by soluble collagen I rescued suspended cells from apoptosis, even in the absence of cell adhesion and spreading. The survival promoting effect of ECM was mediated by the integrin receptors, since (1) the protective effect of soluble collagen I was blocked by anti-integrin antibodies to beta 1 and alpha 1 s...Continue Reading

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Citations

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