Effect of Aplidin in acute lymphoblastic leukaemia cells.

• 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.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Farmakologi och toxikologi (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Pharmacology and Toxicology (hsv//eng)

Nyckelord

Adolescent

Antineoplastic Agents

pharmacology

Apoptosis

drug effects

B-Lymphocytes

drug effects

Caspase 3

Caspases

metabolism

Cell Cycle

drug effects

Child

Child

Preschool

Depsipeptides

Dose-Response Relationship

Drug

Drug Resistance

Neoplasm

Endothelial Growth Factors

genetics

metabolism

Female

Humans

Intercellular Signaling Peptides and Proteins

genetics

metabolism

Karyotyping

Lymphokines

genetics

metabolism

Male

Mass Spectrometry

Peptides

Cyclic

pharmacology

Precursor Cell Lymphoblastic Leukemia-Lymphoma

metabolism

pathology

RNA

Messenger

metabolism

RNA

Neoplasm

metabolism

Stromal Cells

drug effects

pathology

Tumor Cells

Cultured

Vascular Endothelial Growth Factor A

Vascular Endothelial Growth Factors

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)