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Phenotypic and genotypic diversity of human neuroblastoma studied in three IGR cell line models derived from bone marrow metastases

Phenotypic and genotypic diversity of human neuroblastoma studied in three IGR cell line models derived from bone marrow metastases

Cancer Genetics and Cytogenetics 112(2): 124-129

Metastatic stage IV neuroblastoma tumors, as well as cell lines derived from them, are highly malignant and rapidly fatal. To determine whether malignant potential of these cells might be influenced by stromal tissue at sites frequently involved in metastasis, we initiated primary cultures from bone marrow of three patients (331, 337, and 91) with stage IV neuroblastoma. All three explants contained two distinct cell populations, malignant neuroblasts (Nb-type) and substrate adherent stromal-like (Str-type) cells. The cell types were separated at the first passage and studied by cytogenetic, molecular, and immunocytochemical methods. Karyotypic analyses after 3-6 passages in vitro revealed the presence of unique chromosomal abnormalities in Nb-type cells of all three lines: (1) der(1)t(1;7) (p32;q11) and der(5)t(5;17)(q35;q21) in pseudodiploid IGR-N-331 neuroblasts; (2) der(1)t(1;17)(p35;q21-22) x 2 and der(7)t(7;7)(p21;q21) in IGR-N-337 hyperdiploid neuroblasts; and (3) more than six rearranged chromosomes in two related subpopulations of hypodiploid IGR-N-91 neuroblasts. Neuroblastic cells from all three tumors amplified MYCN 25- to 50-fold (with amplified genes visible as dmin or, in one IGR-N-91 subline, as an hsr(14)[q32]) and expressed N-CAM. Str-type cells from tumors 331 and 337 had a normal diploid karyotype, did not express either N-CAM or S-100, and are probably normal bone marrow fibroblasts. By contrast, S-100 negative Str-type IGR-N-91 cells were hypodiploid and shared at least two unbalanced translocations, der(4)t(1;4)(q12;p15) and der(2)t(2;10;17)(p14;q11;q22), with neuroblastic counterparts, indicating that "stromal" cells and malignant neuroblasts had a common tumor cell origin. Thus, the Str-type cells of IGR-N-91 are examples of S-type phenotypic variants frequently described for long-term human neuroblastoma cells lines in vitro, but not previously observed in vivo.

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Accession: 046973918

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PMID: 10686938

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