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Summary: To study the effects of hypoxia on the expression of P-gp and mutltidrug resistance protein in human lung adenocarcinoma A549 cell line, and to explore the probable mechanism of hypoxia in tumor cell of MDR. The expression of hypoxia inducible factor-1α, P-gp and mutltidrug resistance protein was immunohistochemically detected by culturing human lung adenocarcinoma A549 cell under hypoxia (2 % O2) for 24 h. After interaction with adriamycin or cisplatin under hypoxia (2 % O2) for 24 h, the cell survival rate was detected by MTT. Our results showed that the expression of hypoxia inducible factor-1α, P-gp and mutltidrug resistance protein under hypoxia were higher than the expression under normoxia, and correlations between the expression of HIF-1α and P-gp or multidrug resistance-associated protein was observed (P<0.05). The resistance of adriamycin of A549 cell was enhanced under hypoxia. It is concluded that the resistance of tumor chemotherapy is enhanced in hypoxia. The expression of HIF-1α is obviously correlated with the expression of P-gp and mutltidrug resistance protein.
RESUMEN
Objective To investigate the relationship between the interleukin-2 (IL-2) treatment and chemotherapeutic sensitivity in hepatocellular carcinoma (HCC). Methods S-P immunohistochemical staining was adopted to determine the expression of multidrugs resistance-associated protein(MRP1) and IL-2 receptor ? chain in paraffin embedded HCC tissues of the patients treated with and without IL-2. Results The expression level of IL-2 receptor ?-chain in HCC tissues of the patients treated with and without IL-2 was 0.301 9?0.040 23 and 0.263 1?0.022 24, respectively, which had significant difference between the two kinds of HCC tissues. The expression level of MRP1 in the HCC tissues of the patients treated with IL-2 (0.336 4?0.044 67) was markedly higher than that in HCC tissues of the patients treated without IL-2 (0.300 8?0.037 64,t=2.176,P