title: Estradiol and progesterone-mediated regulation of P-gp in P-gp overexpressing cells (NCI-ADR-RES) and placental cells (JAR).
abstract: The effect of progesterone and estrogen treatment on the expression and function of P-glycoprotein (P-gp) was evaluated in JAR cells and a P-gp overexpressing cell line, NCI-ADR-RES. Western blot analysis and real-time Q-PCR were used to evaluate P-gp protein and MDR1 mRNA expression respectively in the cells following incubation with progesterone (P4) and/or beta-estradiol (E2). Cellular uptake studies of the P-gp substrates, saquinavir and paclitaxel, were performed to evaluate function. Treatment with either E2 or P4 resulted in a significant increase in P-gp protein levels in the NCI-ADR-RES cells at concentrations of or greater than 100 nM or 10 nM, respectively. JAR cells also had increased levels of P-gp with 100 nM of P4 but were much more sensitive to E2 showing increased P-gp at a concentration of 1 nM. Furthermore, E2 or P4 treatment resulted in a significant decrease in cellular uptake of the P-gp substrates tested in these cells lines. Based on mRNA quantitation, a transient increase (2-fold) in MDR1 levels was observed at 8 h postincubation with either E2 or P4, while MDR1 levels remained high in the JAR cells treated with E2 for 72 h postincubation. The addition of actinomycin D, a transcription inhibitor negated the increase in P-gp by P4 and E2. P4 and E2 increase P-gp expression and function in NCI-ADR-RES and JAR cells with the ERalpha-expressing cells (JAR) much more sensitive to E2. Furthermore, transcriptional regulation by E2 and P4 likely contributes to the modulation of P-gp levels.
authors.affiliation: Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, 20 Penn Street, Baltimore, Maryland 21201, USA.
authors.forename: Lisa D
authors.initials: LD
authors.lastname: Coles
authors.forename: Insong J
authors.initials: IJ
authors.lastname: Lee
authors.forename: Pamela J
authors.initials: PJ
authors.lastname: Voulalas
authors.forename: Natalie D
authors.initials: ND
authors.lastname: Eddington
mesh_terms: D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D002460:Cell Line; D045744:Cell Line, Tumor; D015853:Cysteine Proteinase Inhibitors / Q000494:pharmacology; D003609:Dactinomycin / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology*; D004967:Estrogens / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D006801:Humans; D007976:Leupeptins / Q000494:pharmacology; D010920:Placenta / Q000166:cytology*; D011247:Pregnancy; D011374:Progesterone / Q000494:pharmacology*; D011372:Progestins / Q000494:pharmacology*; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: C513055:ABCB1 protein, human; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D015853:Cysteine Proteinase Inhibitors; D004967:Estrogens; D007976:Leupeptins; D011372:Progestins; D011500:Protein Synthesis Inhibitors; D003609:Dactinomycin; D011374:Progesterone; D004958:Estradiol; C072553:benzyloxycarbonylleucyl-leucyl-leucine aldehyde