title: Regulation of beta2-adrenergic receptors on CD4 and CD8 positive lymphocytes by cytokines in vitro.
abstract: Increasing evidence points to a close relationship between the autonomic nervous system and the immune system. To further investigate mechanisms regulating beta2-adrenergic receptor (beta2R) expression in lymphocytes, the influence of cytokines on the density of beta2R on purified CD4+ and CD8+ lymphocytes was determined in vitro. beta2R were determined by means of a radioligand binding assay with (125I)iodocyanopindolol. CD4+ and CD8+ lymphocytes were incubated with catecholamines, interleukin 1beta (IL-1beta) and interleukin 2 (IL-2) for 6-72 h. The results demonstrate declining beta2R numbers on CD4+ and CD8+ lymphocytes in vitro augmented by epinephrine. IL-1beta has no effect on beta2R expression compared to medium. However, incubation with IL-2 resulted in an up-regulation of beta2R on CD8+ lymphocytes. Thus, the study demonstrates a differential regulation of beta2R on T-lymphocyte subpopulations with CD8+ lymphocytes being more susceptible to mechanisms of beta2R modulation than CD4+ lymphocytes. The findings further strengthen the concept of a close interplay between the autonomic nervous system and the immune system.
authors.affiliation: Department of Medicine IV, University Hospital Leipzig, Leipzig, Germany. wahm@medizin.uni-leipzig.de
authors.forename: M
authors.initials: M
authors.lastname: Wahle
authors.forename: U
authors.initials: U
authors.lastname: Stachetzki
authors.forename: A
authors.initials: A
authors.lastname: Krause
authors.forename: M
authors.initials: M
authors.lastname: Pierer
authors.forename: H
authors.initials: H
authors.lastname: Häntzschel
authors.forename: C G
authors.initials: CG
authors.lastname: Baerwald
mesh_terms: D000316:Adrenergic alpha-Agonists / Q000494:pharmacology; D000318:Adrenergic beta-Agonists / Q000494:pharmacology; D015496:CD4-Positive T-Lymphocytes / Q000378:metabolism*; D018414:CD8-Positive T-Lymphocytes / Q000378:metabolism*; D002478:Cells, Cultured; D016207:Cytokines / Q000378:metabolism*; D004837:Epinephrine / Q000494:pharmacology; D006801:Humans; D066298:In Vitro Techniques; D007375:Interleukin-1 / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D007700:Kinetics; D009420:Nervous System / Q000378:metabolism; D009638:Norepinephrine / Q000494:pharmacology; D011485:Protein Binding; D011869:Radioligand Assay; D018343:Receptors, Adrenergic, beta-2 / Q000378:metabolism*; D013997:Time Factors; D015854:Up-Regulation
chemical_list: D000316:Adrenergic alpha-Agonists; D000318:Adrenergic beta-Agonists; D016207:Cytokines; D007375:Interleukin-1; D007376:Interleukin-2; D018343:Receptors, Adrenergic, beta-2; D009638:Norepinephrine; D004837:Epinephrine