title: Proteomic analysis of proteins altered by dibenzoylmethane in human prostatic cancer LNCaP cells.
abstract: This paper explores the use of proteomics as a tool for identifying protein species whose expression has been altered by dibenzoylmethane (DBM) in LNCaP cells. Although DBM, a constituent of licorice, has been shown to induce cell cycle arrest and regulate androgen receptor (AR) expression, the mechanism by which these events occur is unknown. To develop a better understanding of the effect of DBM on cancer cells, we analyzed changes in protein expression induced by DBM in LNCaP cells using two-dimensional (2-D) gel electrophoresis. The proteomic approach used to study LNCaP cells has lead to the analysis and identification of a number of protein species that increase or decrease as a result of exposure to DBM. In particular, twenty features were found to be differentially expressed in this study based on the quantitation of two separate 2-D-fluorescence difference gel electrophoresis analyses. Thirteen of these features were identified through mass spectrometric analysis. The intensity of 10 out of the 13 spots identified increased 2- to 3-fold in response to 25 micro M and 50 micro M DBM and the remaining three spots decreased 2-fold in response to the same DBM treatment. This study investigates proteomic changes induced by treatment of cells with DBM in order to develop a model for the mechanism by which DBM induces cell cycle arrest and represses AR expression.
authors.affiliation: Tuskegee University, CBR/RCMI and Cancer Center, Tuskegee, AL, USA. mfrazier@tuskegee.edu
authors.forename: Monica C
authors.initials: MC
authors.lastname: Frazier
authors.forename: Kimberly M
authors.initials: KM
authors.lastname: Jackson
authors.forename: Ewa
authors.initials: E
authors.lastname: Jankowska-Stephens
authors.forename: Mark G
authors.initials: MG
authors.lastname: Anderson
authors.forename: Wayne B
authors.initials: WB
authors.lastname: Harris
mesh_terms: D045744:Cell Line, Tumor; D047188:Chalcones / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional / Q000379:methods; D005260:Female; D020869:Gene Expression Profiling; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry* / Q000378:metabolism*; D011471:Prostatic Neoplasms; D020543:Proteome / Q000032:analysis*; D040901:Proteomics / Q000379:methods; D011944:Receptors, Androgen / Q000235:genetics / Q000378:metabolism
chemical_list: D047188:Chalcones; D009363:Neoplasm Proteins; D020543:Proteome; D011944:Receptors, Androgen; C061481:dibenzoylmethane