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Effect of Aplidin in acute lymphoblastic leukaemia cells.

Erba E, Serafini M, Gaipa G, Tognon G, Marchini S, Celli N, Rotilio D, Broggini M, Jimeno J, Faircloth GT, Biondi A, D'Incalci M - Br. J. Cancer (2003)

Bottom Line: Only in ALL-PO 20 nM Aplidin treatment caused a block of vascular endothelial growth factor (VEGF) secretion and downregulation of VEGF-mRNA, but Aplidin cytotoxicity does not seem to be related to VEGF inhibition since the sensitivity of ALL-PO cells to Aplidin is comparable to that observed for the other cells used.Cells from children with genetic abnormalities such as t(9;22) and t(4;11) translocations, associated with an inferior treatment outcome, were sensitive to Aplidin to the same extent as that observed in other BCP-ALL cases.Aplidin exerted a strong cell killing effect (>88%) against primary culture cells from five relapsed ALL cases, at concentrations much lower than those reported to be achieved in plasma of patients receiving Aplidin at recommended doses.

View Article: PubMed Central - PubMed

Affiliation: Department of Oncology, Istituto di Ricerche Farmacologiche 'Mario Negri', Via Eritrea, 62-20157 Milan, Italy. erba@marionegri.it

ABSTRACT
The cytotoxic effect of Aplidin was investigated on fresh leukaemia cells derived from children with B-cell-precursor (BCP) acute lymphoblastic leukaemia (ALL) by using stromal-layer culture system and on four cell lines, ALL-PO, Reh, ALL/MIK and TOM-1, derived from patients with ALL with different molecular genetic abnormalities. In ALL cell lines Aplidin was cytotoxic at nanomolar concentrations. In the ALL cell lines the drug-induced cell death was clearly related to the induction of apoptosis and appeared to be p53-independent. Only in ALL-PO 20 nM Aplidin treatment caused a block of vascular endothelial growth factor (VEGF) secretion and downregulation of VEGF-mRNA, but Aplidin cytotoxicity does not seem to be related to VEGF inhibition since the sensitivity of ALL-PO cells to Aplidin is comparable to that observed for the other cells used. Aplidin induced a G(1) and a G(2) M block in ALL cell lines. In patient-derived leukaemia cells, Aplidin induced a strong cytotoxicity evidenced in a stroma-supported immunocytometric assay. Cells from children with genetic abnormalities such as t(9;22) and t(4;11) translocations, associated with an inferior treatment outcome, were sensitive to Aplidin to the same extent as that observed in other BCP-ALL cases. Aplidin exerted a strong cell killing effect (>88%) against primary culture cells from five relapsed ALL cases, at concentrations much lower than those reported to be achieved in plasma of patients receiving Aplidin at recommended doses. Taken together these data suggest that Aplidin could be a new anticancer drug to be investigated in ALL patients resistant to available therapy.

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Autoradiography of a typical RNAse protection assay on the four different human leukaemic cell lines. Human ovarian cancer A2780 cells were used as an internal control.
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fig6: Autoradiography of a typical RNAse protection assay on the four different human leukaemic cell lines. Human ovarian cancer A2780 cells were used as an internal control.

Mentions: It has been reported by our group that Aplidin causes a strong block of VEGF secretion in Molt-4 cells with a subsequent downregulation of the transcription of VEGF and of its receptor VEGFR1 (Broggini et al, 2003). To test the hypothesis that Aplidin could exert its activity in ALL cell lines by inhibiting the VEGF/VEGFR-1 autocrine loop, we used an RNAse protection assay in each cell line. As shown in Figure 6Figure 6


Effect of Aplidin in acute lymphoblastic leukaemia cells.

Erba E, Serafini M, Gaipa G, Tognon G, Marchini S, Celli N, Rotilio D, Broggini M, Jimeno J, Faircloth GT, Biondi A, D'Incalci M - Br. J. Cancer (2003)

Autoradiography of a typical RNAse protection assay on the four different human leukaemic cell lines. Human ovarian cancer A2780 cells were used as an internal control.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC2376915&req=5

fig6: Autoradiography of a typical RNAse protection assay on the four different human leukaemic cell lines. Human ovarian cancer A2780 cells were used as an internal control.
Mentions: It has been reported by our group that Aplidin causes a strong block of VEGF secretion in Molt-4 cells with a subsequent downregulation of the transcription of VEGF and of its receptor VEGFR1 (Broggini et al, 2003). To test the hypothesis that Aplidin could exert its activity in ALL cell lines by inhibiting the VEGF/VEGFR-1 autocrine loop, we used an RNAse protection assay in each cell line. As shown in Figure 6Figure 6

Bottom Line: Only in ALL-PO 20 nM Aplidin treatment caused a block of vascular endothelial growth factor (VEGF) secretion and downregulation of VEGF-mRNA, but Aplidin cytotoxicity does not seem to be related to VEGF inhibition since the sensitivity of ALL-PO cells to Aplidin is comparable to that observed for the other cells used.Cells from children with genetic abnormalities such as t(9;22) and t(4;11) translocations, associated with an inferior treatment outcome, were sensitive to Aplidin to the same extent as that observed in other BCP-ALL cases.Aplidin exerted a strong cell killing effect (>88%) against primary culture cells from five relapsed ALL cases, at concentrations much lower than those reported to be achieved in plasma of patients receiving Aplidin at recommended doses.

View Article: PubMed Central - PubMed

Affiliation: Department of Oncology, Istituto di Ricerche Farmacologiche 'Mario Negri', Via Eritrea, 62-20157 Milan, Italy. erba@marionegri.it

ABSTRACT
The cytotoxic effect of Aplidin was investigated on fresh leukaemia cells derived from children with B-cell-precursor (BCP) acute lymphoblastic leukaemia (ALL) by using stromal-layer culture system and on four cell lines, ALL-PO, Reh, ALL/MIK and TOM-1, derived from patients with ALL with different molecular genetic abnormalities. In ALL cell lines Aplidin was cytotoxic at nanomolar concentrations. In the ALL cell lines the drug-induced cell death was clearly related to the induction of apoptosis and appeared to be p53-independent. Only in ALL-PO 20 nM Aplidin treatment caused a block of vascular endothelial growth factor (VEGF) secretion and downregulation of VEGF-mRNA, but Aplidin cytotoxicity does not seem to be related to VEGF inhibition since the sensitivity of ALL-PO cells to Aplidin is comparable to that observed for the other cells used. Aplidin induced a G(1) and a G(2) M block in ALL cell lines. In patient-derived leukaemia cells, Aplidin induced a strong cytotoxicity evidenced in a stroma-supported immunocytometric assay. Cells from children with genetic abnormalities such as t(9;22) and t(4;11) translocations, associated with an inferior treatment outcome, were sensitive to Aplidin to the same extent as that observed in other BCP-ALL cases. Aplidin exerted a strong cell killing effect (>88%) against primary culture cells from five relapsed ALL cases, at concentrations much lower than those reported to be achieved in plasma of patients receiving Aplidin at recommended doses. Taken together these data suggest that Aplidin could be a new anticancer drug to be investigated in ALL patients resistant to available therapy.

Show MeSH
Related in: MedlinePlus