Identification and characterization of an active soluble form of human CD38 in normal and pathological fluids
| Autor: | Fabio Malavasi, Luisa Franco, L. Calosso, Renzo P. Tarocco, Ada Funaro, Massimo Morra, Antonio De Flora, Alberto L. Horenstein |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1996 |
| Předmět: |
ADP-ribosyl Cyclase
medicine.drug_class Immunology CD38 Monoclonal antibody Ligands Affinity chromatography Western blot Antigens CD medicine Tumor Cells Cultured Immunology and Allergy Ascitic Fluid Humans Phosphofructokinase 2 N-Glycosyl Hydrolases Membrane Glycoproteins biology medicine.diagnostic_test Chemistry Antibodies Monoclonal General Medicine Amniotic Fluid Molecular biology ADP-ribosyl Cyclase 1 Antigens Differentiation Body Fluids Biochemistry Solubility Cell culture Polyclonal antibodies biology.protein |
| Popis: | Human CD38 is a transmembrane glycoprotein involved in lymphocyte activation and adhesion to endothelium. The ectocellular domain of the molecule possesses properties of a bifunctional enzyme catalyzing both the synthesis from NAD+ and the hydrolysis of the calcium-releasing metabolite cyclic ADP-ribose (cADPR). Surface expression of CD38 (mCD38) is rapidly and almost completely down-modulated upon ligation by specific mAb in cells from different lineages. The data presented here also show that, in addition to the existence of a mCD38, a soluble form of CD38 (sCD38) is detectable in the cell culture supernatant of allo-activated T lymphocytes and of several tumor cell lines. sCD38 is also present in vivo and is assayable in normal (fetal serum and amniotic fluid) and pathological (serum and ascites from patients with multiple myeloma, and serum from patients with AIDS) biological fluids. Immunoaffinity chromatography, SDS-PAGE and Western blot analyses with mAb and polyclonal antibodies, along with metabolic labeling, yield a body of data concerning the structure of sCD38, which displays a M(r) of 39 kDa. Native sCD38 maintains the ability to inhibit the binding activity of different anti-CD38 mAb and still catalyzes the synthesis and the hydrolysis of cADPR at the same ratio observed with mCD38. Furthermore, cross-linking experiments indicate that the purified soluble molecule binds a 120 kDa molecule expressed by monocytoid cells and identified as a candidate ligand for human mCD38. |
| Databáze: | OpenAIRE |
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