RESUMO
Our previous study showed that malignant phenotype of human promyelocytic leukemia cells could he suppressed by fusion of them with mouse reticulocytes. In order to investigate the morphological changes for malignancy reversion, the present experiment was designed to study the microscepic and submicroscopic structure of cybrid cells and compared with their parental tumor cells. The results indicated that during the short period of cybrid cell cultivation, nuclei of numerous cybrid cells became pyknotic and eccentric, and some cells showed the process of nuclear expulsion (denucleation). The cybrids which cultivated for long period in vitro developed into more mature cells along both myeloid and erythroid differentiation pathway. The effects of mouse reticulocyte cytoplasmic factor on differentiation pathway of human promyelocytic leukemia cells were discussed.
RESUMO
The present study is designed to establish a xenograft model of human promyelocytic leukemia cell mutant (HL-60-AR) deficient in hypoxanthine guanine phosphoribosyltransferase (HGPRT) in nude mice. A solid leukemia sarcoma developed after subcutaneous inoculation with HL-60-AR cells. Comparative studies of HL-60-AR/Nu tumor cells in nude mice and cultured HL-60-AR cells in vitro revealed virtual identity as shown by light microscopic morphology, ultrastructure of cell, cytochemistry, chromosome analysis, LDH isoenzyme pattern, genetic markers and differentiated characters assay. Up to now, twelve generations haw been transmitted in rive by inoculating with the solid tumor Cells developed in nude mice. This nude mice model in which human leukemia cells grew could be considered as a useful model for in rive studies of human leukemic cells proliferation, differentiation and the screening for anti-leukemia drugs.