title: Down-regulation of beta-adrenergic receptors induced by mitogen activation of intracellular signaling events in lymphocytes.
abstract: The expression of beta-adrenergic receptors on murine lymphocytes stimulated with concanavalin A was studied. A decrease in beta-adrenoceptor number on T lymphocytes and a diminished response to specific agonist stimulation at the peak of proliferation was found. The blockade of cell proliferation by tyrosine kinases or protein kinase C inhibitors reversed the decrease in beta-adrenoceptor number. PMA plus ionophore or interleukin-2 but not PMA alone were able to induce beta-adrenoceptor down-regulation accompanying cellular proliferation. These results showed that the intracellular signals triggered during lymphocyte activation are involved in beta-adrenoceptor down-regulation and it would represent the loss of a mechanism that exerts negative neuroimmune control of cellular proliferation.
authors.affiliation: Centro de Estudios Farmacológicos y Botánicos (CEFYBO-CONICET), Buenos Aires, Argentina.
authors.forename: C A
authors.initials: CA
authors.lastname: Cazaux
authors.forename: L
authors.initials: L
authors.lastname: Sterin-Borda
authors.forename: G
authors.initials: G
authors.lastname: Gorelik
authors.forename: G A
authors.initials: GA
authors.lastname: Cremaschi
mesh_terms: D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; D000818:Animals; D000001:Calcimycin / Q000494:pharmacology; D003208:Concanavalin A / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D015536:Down-Regulation; D019833:Genistein; D066298:In Vitro Techniques; D007376:Interleukin-2 / Q000378:metabolism; D007424:Intracellular Fluid / Q000378:metabolism; D007529:Isoflavones / Q000494:pharmacology; D007546:Isoquinolines / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D015213:Neuroimmunomodulation; D010879:Piperazines / Q000494:pharmacology; D047428:Protein Kinase Inhibitors; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011943:Receptors, Adrenergic, beta / Q000276:immunology / Q000378:metabolism*; D015398:Signal Transduction; D013449:Sulfonamides; D013601:T-Lymphocytes / Q000187:drug effects / Q000276:immunology* / Q000378:metabolism*
chemical_list: D007376:Interleukin-2; D007529:Isoflavones; D007546:Isoquinolines; D010879:Piperazines; D047428:Protein Kinase Inhibitors; D011943:Receptors, Adrenergic, beta; D013449:Sulfonamides; D003208:Concanavalin A; D000001:Calcimycin; D019307:1-(5-Isoquinolinesulfonyl)-2-Methylpiperazine; C043204:N-(2-guanidinoethyl)-5-isoquinolinesulfonamide; D019833:Genistein; D000242:Cyclic AMP; D011505:Protein-Tyrosine Kinases