[An experimental study of recombinant adenovirus microsphere carrying antisense multidrug resistance-associated protein gene for reversing MRP of hepatocellular carcinoma in vitro].

Objective: To conduct an in vitro study on the effect of recombinant adenovirus microsphere encapusulated antisense MRP (as-mrp) for use in the gene therapy to overcome drug resistance in hepatocellular carcinoma.

Methods: Recombinant adenovirus microsphere encapusulated as-mrp was transfected into hepatocellular carcinoma multidrug resistance cells HepG2/ADM, the fluorescence intensity of transfected cells were observed at 48 hours and 120 hours after transfection. in vitro drug sensitivity was measured by MTT assay; the resistant index of andromycin resistant variants was determined by drawing the cell dosage reaction curves. The levels of MRP mRNA expression were detected by RT-PCR and the ratio of MRP mRNA/beta-actin was detected. Intracelluar rubidomycin (DNR) concertration was examined by flow cytometry (FCM).

Results: More than 90% of the HepG2/ADM cells could be transfected when microspheres being 10 mg. Adv microsphere inhibited the expression of mRNA in HepG2/ADM and enhanced the sensitivity of HepG2/ADM to chemotherapeutic drug.

Conclusion: Recombinant adenovirus microsphere encapusulated as-mrp could effectively reverse HepG2/ADM cells, which would provide an experimental basis for the methods of reversing the multidrug resistance in human hepatocellular carcinoma.