Title : Role of efflux pump activity in lapatinib/caelyx combination in breast cancer cell lines.

Pub. Date : 2009 Nov

PMID : 19752719






4 Functional Relationships(s)
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1 Simultaneous exposure to lapatinib and caelyx in SkBr3 cell line produced an additive cytotoxic effect with dephosphorylation of HER2 and EGFR, an upregulation of p21, and an induction of apoptosis through dephosphorylation of BAD and caspase cleavage. liposomal doxorubicin erb-b2 receptor tyrosine kinase 2 Homo sapiens
2 Our data indicate that lapatinib used in combination with caelyx is active in HER2-expressing cells, probably because of lapatinib-induced dephosphorylation of the HER2-EGFR pathway, and also in non-HER2-expressing cells, possibly because lapatinib blocks efflux pump activity, increasing the length of time of intracellular exposure to caelyx and thereby increasing its cytotoxic effect. liposomal doxorubicin erb-b2 receptor tyrosine kinase 2 Homo sapiens
3 Our data indicate that lapatinib used in combination with caelyx is active in HER2-expressing cells, probably because of lapatinib-induced dephosphorylation of the HER2-EGFR pathway, and also in non-HER2-expressing cells, possibly because lapatinib blocks efflux pump activity, increasing the length of time of intracellular exposure to caelyx and thereby increasing its cytotoxic effect. liposomal doxorubicin erb-b2 receptor tyrosine kinase 2 Homo sapiens
4 Our data indicate that lapatinib used in combination with caelyx is active in HER2-expressing cells, probably because of lapatinib-induced dephosphorylation of the HER2-EGFR pathway, and also in non-HER2-expressing cells, possibly because lapatinib blocks efflux pump activity, increasing the length of time of intracellular exposure to caelyx and thereby increasing its cytotoxic effect. liposomal doxorubicin erb-b2 receptor tyrosine kinase 2 Homo sapiens