Post-receptorial mechanisms underlie functional disregulation of β 2-adrenergic receptors in lymphocytes from Multiple Sclerosis patients

Abstract

Increased density of β 2-adrenergic receptors has been demonstrated on peripheral blood mononuclear cells (PBMCs) from Multiple Sclerosis (MS) patients. In this study we found that isoproterenol reduces T-cell proliferation and IFNγ secretion in PBMCs cultures from healthy controls and IFNβ-treated but not untreated MS patients. Reduced expression levels of G protein coupled receptor kinase (GRK)2/3 ( p<0.05) and increased isoproterenol-induced cAMP accumulation ( p<0.0001) were found in PBMCs from all MS patients. Dibutyryl cAMP reduced the proliferation of PBMCs from all subgroups but in a slighter manner in untreated MS patients. We conclude that signalling through β 2-adrenergic receptors is chronically up-regulated but functionally uncoupled to immunoregulatory functions of lymphocytes from MS patients. Disregulation downstream the cAMP-associated signalling may underlie such a phenomenon.