Differential expression and androgen regulation of the human selenium-binding protein gene hSP56 in prostate cancer cells.
Low levels of dietary selenium are associated with increased risk of malignancy of several organs, including the prostate. Using a subtractive approach called linker capture subtraction, we have found that the human selenium-binding protein gene hSP56 is differentially expressed by the relatively slow-growing, androgen-sensitive prostate cancer cell line LNCaP but not by the more rapidly growing androgen-insensitive lines PC-3 and DU145. We confirmed this differential expression by Northern blot analysis. Importantly, hSP56 expression by LNCaP cells was reversibly down-regulated by exogenous androgen in a concentration-dependent manner. Marked differences in steady-state hSP56 mRNA levels were found in a variety of normal and neoplastic human cells that were examined. hSP56 expression was especially high in normal tissues that appear to benefit from the cancer-protective action of dietary selenium and was low in many neoplastic cells. The results suggest that hSP56 may play a role in determining the neoplastic phenotype.
Yang
M
M
Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts 02215, USA.
Sytkowski
A J
AJ
D000728:Androgens / Q000378:metabolism* / Q000494:pharmacology; D001483:Base Sequence; D002277:Carcinoma / Q000235:genetics*; D002352:Carrier Proteins / Q000235:genetics* / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D015536:Down-Regulation; D006360:Heat-Shock Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D011471:Prostatic Neoplasms / Q000235:genetics*; D051137:Selenium-Binding Proteins; D022021:Tacrolimus Binding Proteins; D014407:Tumor Cells, Cultured / Q000187:drug effects
D000728:Androgens; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; D006360:Heat-Shock Proteins; D009363:Neoplasm Proteins; C495175:SELENBP1 protein, human; D051137:Selenium-Binding Proteins; D022021:Tacrolimus Binding Proteins