title: Modulation of fas-ligand (Fas-L) on human microglial cells: an in vitro study.
abstract: The expression of Fas-Ligand (Fas-L) on microglia could be relevant in multiple sclerosis immunopathology. The present study was performed to evaluate in vitro the expression of Fas-L in human microglial cells both unstimulated and after stimulation with IFN-gamma, beta-IFN-1b and beta-IFN-1b+IFN-gamma. Cells were stimulated for 6,12, 24 and 48 h. Surface Fas-L was evaluated by flow cytometry, total Fas-L by Western blot, whereas mRNA for Fas-L was measured by RT-PCR. We also evaluated the capacity of microglial cells to induce, in vitro, apoptosis on Fas-positive T leukemia Jurkat cells. Our results showed a constitutive expression of Fas-L on microglia. IFN-gamma downregulated the expression of the molecule, while beta-IFN-1b and beta-IFN-1b+IFN- gamma did not. The amount of surface Fas-L was related to the ability of microglial cells to induce apoptosis in Fas-positive target cells, which was partly inhibited by blockade of the Fas-Fas-L pathway.
authors.affiliation: Istituto Nazionale Neurologico 'C. Besta', Via Celoria 11, 20133, Milan, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Frigerio
authors.forename: V
authors.initials: V
authors.lastname: Silei
authors.forename: E
authors.initials: E
authors.lastname: Ciusani
authors.forename: G
authors.initials: G
authors.lastname: Massa
authors.forename: G M
authors.initials: GM
authors.lastname: Lauro
authors.forename: A
authors.initials: A
authors.lastname: Salmaggi
mesh_terms: D002478:Cells, Cultured; D053222:Fas Ligand Protein; D005434:Flow Cytometry; D006801:Humans; D000068556:Interferon beta-1a; D000068576:Interferon beta-1b; D016899:Interferon-beta / Q000494:pharmacology; D007371:Interferon-gamma / Q000494:pharmacology; D008562:Membrane Glycoproteins / Q000032:analysis* / Q000235:genetics; D017628:Microglia / Q000737:chemistry*; D012333:RNA, Messenger / Q000032:analysis
chemical_list: C505661:FASLG protein, human; D053222:Fas Ligand Protein; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D000068576:Interferon beta-1b; D016899:Interferon-beta; D007371:Interferon-gamma; D000068556:Interferon beta-1a