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130<br />

Chapter 3: CML<br />

mobilization. All patients <strong>and</strong> normal individuals provided informed consent for these<br />

studies. Mononuclear cells (MNCs) were separated by centrifugation on a Ficoll-<br />

Hypaque gradient (density 1.077 g/ml). CD34 +<br />

cells were enriched according to a<br />

magnetic cell sorting methodology (MACS; Miltenyi Biotec, Germany). 22<br />

Purity of CML<br />

<strong>and</strong> normal CD34 +<br />

cell fractions ranged from 63 to 97% <strong>and</strong> 75 to 86%, respectively.<br />

lines 23<br />

Cell lines<br />

32D-T2/93 (BCR-ABL-negative) <strong>and</strong> 32DLG7 (BCR-ABL-positive) cell<br />

(kindly provided by Dr. A. Santucci, Hematology Department, Bologna,<br />

Italy) were used to investigate the apoptosis-inducing effect of AG957. Both cell<br />

lines were cultured in RPMI-1640 supplemented with fetal bovine serum (FBS)<br />

(10%, vol/vol) <strong>and</strong> L-glutamine (2 mM). Culture medium for 32D-T2/93 cells was<br />

also supplemented (10% vol/vol) with a conditioned medium of the WEHI-3 cell<br />

line as source of murine interleukin (IL)-3 .<br />

CFU-Mix, BFU-E, <strong>and</strong> CFU-GM assay<br />

The assay for multilineage colony-forming units (CFU-Mix), erythroid bursts<br />

(BFU-E), <strong>and</strong> granulocyte-macrophage colony-forming units (CFU-GM) was<br />

carried out as described elsewhere.<br />

LTC-IC assay<br />

The long-term culture-initiating cell (LTC-IC) assay was performed according<br />

to Sutherl<strong>and</strong> et al. 24<br />

Cytogenetic analysis<br />

Cytogenetic analysis <strong>and</strong> st<strong>and</strong>ard GTG- or QFQ-b<strong>and</strong>ing techniques were<br />

performed according to st<strong>and</strong>ard methods. 25<br />

Detection of BCR-ABL mRNA in individual progenitors<br />

Colonies were individually removed under an inverted microscope <strong>and</strong> processed<br />

for BCR-ABL mRNA detection according to a previously described procedure.<br />

DNA fragmentation<br />

To investigate the capability of AG957 to trigger apoptosis, the BCR-ABLtransfected<br />

32DLG7 cell line <strong>and</strong> its parental clone 32D-T2/93 were used. Nuclear

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