Biopolym. Cell. 2014; 30(1):54-60.
Biomedicine
Effect of anticancer drugs on breast cancer cells sensitive and resistant to doxorubicin: expression of mRNAs of TGF-β and its receptors
1Chorna I. V., 2Fedorenko O. V., 2Stoika R. S.
  1. Sumy State University
    2, Rymskogo-Korsakova., Sumy, Ukraine, 40007
  2. Institute of Cell Biology, NAS of Ukraine
    14/16, Drahomanov Str., Lviv, Ukraine, 79005

Abstract

Aim. Comparative study of the effect of chemotherapeutic drugs (doxorubicin, methotrexate and cisplatin) and TGF-β on the human breast carcinoma MCF-7 cells, sensitive (wt) and resistant (DOX/R) to the doxorubicin action. Methods. Semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) was used for the estimation of expression of mRNAs coding for the TGF-β isoforms (TGF-β1 and TGF-β2) and the TGF-β type I and II receptors (TRI and TRII). Trypan blue exclusion method was used for measuring cell number and cell viability. Results. The MCF-7(DOX/R) cells were more refractory to the TGF1-dependent growth inhibition than the MCF-7(wt) cells. The level of mRNAs coding for TGF and its receptors was higher in the untreated MCF-7 (DOX/R) cells comparing to the MCF-7(wt) cells. The expression of mRNA coding for TRII was decreased in both cell lines treated with doxorubicin, methotrexate and cisplatin, while the down-regulation of mRNA coding for TRI was revealed only in the MCF-7(DOX/R) cells upon the treatment with doxorubicin and methotrexate. Conclusions. The differential effects of studied anticancer drugs and TGF-β on the doxorubicin-sensitive and -resistant cells have been demonstrated. The elucidation of the molecular mechanisms of escape of the MCF-7 (DOX/R) cells from the growth inhibition by TGF-β requires further investigation.
Keywords: MCF-7, TGF-, doxorubicin, methotrexate, cisplatin, resistance

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