Aim:To study the effect of hypoxia on expression of multidrug resistance protein(MRP1) and its mechanism of multidrug resistance in ESCC, and to provide a new target for treatment of ESCC.Methods:To establish a hypoxia model of EC9706 cells by a chemical hypoxia inducer (Cobalt chloride, CoCl2). RNA-interference targeting HIF-1α was used to silence the expression of HIF-1α in human EC9706 cell line. The effect of HIF-1α gene silencing was measured by RT-PCR. The expressions of MRP1 were measured respectivel...