Viable bone marrow stromal cells are required for the in vitro survival of B-cell precursor acute lymphoblastic...

The growth of B-cell precursor acute lymphoblastic leukemic (BCP ALL) cells in vitro is dependent on interactions with bone marrow (BM) stromal cells. We have recently demonstrated that the rate of cell division of BCP ALL cells increases when cultured in direct contact with BM stromal cells. A number of studies have examined the binding of BCP ALL cells to BM stromal cells and extracellular matrix components. To date there have been no studies examining the effect of such binding on the growth and survival of BCP ALL cells. In this study, by measuring the growth parameters of these cells with use of a lipophilic fluorescent probe, PKH 26 GL, we demonstrate the positive effect of viable BM stromal cells on BCP ALL cell survival in 10 patient samples. At the same time, by comparing these cultures with cultures of the same patient samples in the presence of glutaraldehyde-fixed stromal cells, deoxycholic acid-derived stromal cell matrices, purified laminin, collagen or fibronectin, the role of various stromal cell-derived contact components in BCP ALL survival was tested. It was shown that the survival of BCP ALL cells in vitro was dependent upon viable BM stromal cells present in co-culture as the various contact components did not show any functional effect on BCP ALL cell survival.