Title of article :
Mechanisms of resistance and adaptation to thapsigargin in androgen-independent prostate cancer PC3 and DU145 cells
Author/Authors :
Lee، نويسنده , , Dong I. and Sumbilla، نويسنده , , Carlota and Lee، نويسنده , , Myounghee and Natesavelalar، نويسنده , , Chidambaram and Klein، نويسنده , , Michael G. and Ross، نويسنده , , Douglas D. and Inesi، نويسنده , , Giuseppe and Hussain، نويسنده , , Arif، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2007
Abstract :
Cells with increasing resistance to the sarcoplasmic/endoplasmic reticulum Ca2+-ATPase (SERCA) inhibitor thapsigargin (TG), ranging from 60-fold (PC3/TG10 cells) to 1350-fold (PC3/TG2000 cells), were derived from PC3 cells. SERCA2 is overexpressed in all PC3/TG cells but retains sensitivity to TG. siRNA-mediated downregulation of SERCA completely or partially reverses TG resistance in PC3/TG10 or PC3/TG2000 cells, respectively; thus SERCA overexpression mediates resistance in PC3/TG10 cells but is not the only resistance mechanism in PC3/TG2000 cells. By contrast, SERCA is not overexpressed in TG-resistant DU145/TG cells derived from DU145 cells. DU145/TG cells retain resistance while in PC3/TG cells resistance decreases upon removal of TG selection. The transport proteins PGP/BCRP/MRP1 and anti-apoptotic proteins Bcl2/BclXL are not involved in mediating resistance in either cell line. PARP and caspase 3 cleavage in response to other drugs demonstrate that the apoptotic pathways tested remain intact in these cells. Further, no cross-resistance occurs to other drugs. Thus, novel TG-specific resistance mechanisms are recruited by these cancer cells.
Keywords :
Thapsigargin , resistance , SERCA , prostate cancer , Calcium
Journal title :
Archives of Biochemistry and Biophysics
Journal title :
Archives of Biochemistry and Biophysics