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Brazilian Journal of Medical and Biological Research

On-line version ISSN 1414-431X


DORLHIAC-LLACER, P.E. et al. In vitro cytotoxicity of the LDE: daunorubicin complex in acute myelogenous leukemia blast cells. Braz J Med Biol Res [online]. 2001, vol.34, n.10, pp. 1257-1263. ISSN 1414-431X.

Acute myelogenous leukemia (AML) blast cells show high-affinity degradation of low-density lipoprotein (LDL), suggesting an increased expression of cellular LDL receptors. LDE is a lipid microemulsion easily synthesized in vitro which is known to mimic the metabolic pathway of LDL. We used LDE as a carrier for daunorubicin and assayed the cytotoxicity of the complex using AML blast cells since RT-PCR analysis showed that AML cells express LDL receptor mRNA. The LDE:daunorubicin complex killed 46.7% of blast cells and 20.2% of normal bone marrow cells (P<0.001; Student t-test). Moreover, this complex destroyed AML blast cells as efficiently as free daunorubicin. Thus, LDE might be a suitable carrier of chemotherapeutic agents targeting these drugs to neoplastic cells and protecting normal tissues.

Keywords : cytotoxicity; acute myelogenous leukemia; daunorubicin; low-density lipoprotein; LDE complex; RT-PCR.

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