Abstract

Several reports indicate that marrow stromal cells are conducive to development of both myeloid and lymphoid leukemic cell lines in vitro. We present data on an in-vitro/in-vivo murine model that establishes that: (i) murine LL cell lines (L5178Y, P388 and L1210) invade the bone marrow when injected via the tail vein; (ii) degree of marrow invasion by LL can be determined quantitatively; (iii) there is a close association or adherence between MSC and LL cells in vivo; and (iv) in-vitro adherence of murine LL cells to MSC can be quantitated. This in-vitro/in-vivo murine model will be helpful in deciphering the importance of heterotypic adherence between marrow stromal cells and leukemic cells in vivo.

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