title: Regulation of delta opioid receptor expression by anti-CD3-epsilon, PMA, and ionomycin in murine splenocytes and T cells.
abstract: Previous studies have shown that low levels of delta opioid receptor (DOR) mRNA were detectable by reverse transcription polymerase chain reaction (RT-PCR) in unstimulated splenocytes from BALB/c female mice. This study demonstrates that DOR transcripts can be detected in freshly obtained splenocytes froin CD 1 female mice as well. The results of studies using quantitative competitive RT-PCR showed that DOR transcripts in splenic T cells increased from < 1 copy/cell to 22 and 42 copies/cell, respectively, after stimulation with anti-CD3-epsilon for 24 and 48 h compared to the level in freshly obtained T cells. In the presence of actinomycin D, anti-CD3-epsilon did not affect the rate of degradation of DOR mRNA, suggesting that its stability is not altered by anti-CD3-epsilon. After incubation with phorbol myristate acetate (PMA) and ionomycin, the expression of DOR mRNA in splenocytes and T cells was significantly reduced compared with unstimulated cells in culture. In addition, the inhibitory effect of PMA prevented anti-CD3-epsilon-stimulated DOR expression. These data suggest that signaling through the T cell receptor complex by anti-CD3-epsilon regulates DOR expression differently than PMA and ionomycin.
authors.affiliation: Department of Pharmacology, University of Tennessee College of Medicine, Memphis, USA.
authors.forename: M D
authors.initials: MD
authors.lastname: Li
authors.forename: K
authors.initials: K
authors.lastname: McAllen
authors.forename: B M
authors.initials: BM
authors.lastname: Sharp
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000494:pharmacology*; D017252:CD3 Complex; D002478:Cells, Cultured; D003609:Dactinomycin / Q000494:pharmacology; D005260:Female; D015759:Ionomycin / Q000494:pharmacology*; D007476:Ionophores / Q000494:pharmacology*; D051379:Mice; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011948:Receptors, Antigen, T-Cell / Q000276:immunology* / Q000502:physiology; D017465:Receptors, Opioid, delta / Q000096:biosynthesis* / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013154:Spleen / Q000166:cytology / Q000378:metabolism*; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology / Q000378:metabolism*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology*
chemical_list: D000911:Antibodies, Monoclonal; D017252:CD3 Complex; C115335:CD3E protein, human; D007476:Ionophores; D011500:Protein Synthesis Inhibitors; D012333:RNA, Messenger; D011948:Receptors, Antigen, T-Cell; D017465:Receptors, Opioid, delta; D003609:Dactinomycin; D015759:Ionomycin; D013755:Tetradecanoylphorbol Acetate