Altered expression of resistance associated genes in hepatoblastoma xenografts incorporated into mice following treatment with adriamycin or cisplatin.
الكلمات الدالة
نبذة مختصرة
To study the development of drug resistance in childhood hepatoblastoma (HB) using a model closely related to in vivo conditions, we cultivated HB xenografts from 3 patients into mice and treated these tumors with either adriamycin (ADR) or cisplatin (CIS). Determination of the relative expression levels of various resistance associated genes by a cDNA-PCR approach showed: a) Significantly enhanced MDR1 gene expression levels after treatment with ADR in each case. b) Significantly enhanced glutathione S-transferase mu (GST mu) gene expression levels after treatment with CIS in 2/3 xenografts. c) Significantly decreased levels of topoisomerase IIa (TOPO IIa) in tumors of the same two patients after treatment with either ADR or CIS. These findings give evidence that the MDR1-, GST mu- and TOPO IIa-gene products may contribute to drug resistance in HB.