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[Influence of expression of six transmembrane epithelial antigen of the prostate-1 on intracellular reactive oxygen species level and cell growth: an in vitro experiment].

OBJECTIVE
To investigate the STEAP1 gene function of the newly discovered gene six transmembrAne epithelial antigen of the prostate-1 (STEAP1).


METHODS
Total RNA was obtained from human prostate cancer tissue and underwent PCR amplification. The full length of STEAP1 gene thus obtained was cloned. Mammalian expression vector pcDNA3. 1-STEAP1 was constructed and stably transfected into the human thyroid epithelial cells of the line FRTAP2320. A growth curve of the transfected cells was drawn. The intracellular reactive oxygen species (ROS) level was determined by flow cytometry (FC) with dichlorodihydrofluorescein diacetate (DCFHDA).


RESULTS
The growth curve showed that the STEAP1 transfected cells grew faster than the control cells. FC showed that the fluorescence intensity of he intracellular ROS of the STEAP1 transfected cells was 42.13 +/- 1.13, significantly higher than those of the cell transfected with blank plasmid (10.02 +/- 1.42) and un-transfected cells (13.02 +/- 2.42, both P < 0.01).


CONCLUSION
STEAP1 promotes the cell growth through inducing the intracellular ROS level.