title: Lymphocyte membrane alpha-1-acid glycoprotein: a cellular synthesis during lymphocyte activation.
abstract: Soluble alpha 1 acid-glycoprotein is considered an "acute phase protein" with an inhibitory effect on lymphocyte activity; it has recently been shown that a lymphocyte modulatory variant of alpha 1 acid-glycoprotein has a positive role on T cell activation. It is not clear whether the presence of this glycoprotein on lymphocyte membranes is due to an endogenous production or to a passive uptake of soluble alpha 1 acid-glycoprotein by its carbohydrate moiety. Our data show an increase of membrane alpha 1 acid-glycoprotein both in peripheral blood lymphocyte and T-enriched lymphocytes after phytohemagglutinin stimulation. Peripheral blood lymphocyte enzymatic treatment by neuraminidase does not affect alpha 1 acid-glycoprotein expression while pronase digestion induces a strong decrease of alpha 1 acid-glycoprotein positive lymphocytes and a resynthesis after phytohemagglutinin stimulation. Furthermore, the presence of alpha 1 acid-glycoprotein was prevalently, found on helper/inducer lymphocytes. These data support the hypothesis of a synthesis of alpha 1 acid-glycoprotein by T lymphocytes during their activation process.
authors.affiliation: Patologia Medica I, University of Bologna, Italy.
authors.forename: G F
authors.initials: GF
authors.lastname: Stefanini
authors.forename: M
authors.initials: M
authors.lastname: Mazzetti
authors.forename: G C
authors.initials: GC
authors.lastname: Piccinini
authors.forename: S
authors.initials: S
authors.lastname: Capelli
authors.forename: M
authors.initials: M
authors.lastname: Baraldini
authors.forename: G
authors.initials: G
authors.lastname: Gasbarrini
mesh_terms: D002462:Cell Membrane / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006801:Humans; D066298:In Vitro Techniques; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000378:metabolism*; D009961:Orosomucoid / Q000096:biosynthesis*; D013601:T-Lymphocytes / Q000378:metabolism
chemical_list: D009961:Orosomucoid