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Departamento de Bioquímica y Biología Molecular y Cellular, Facultad de Ciencias, and
Servicio de Inmunología, Hospital Clínico Universitario, Universidad de Zaragoza, Zaragoza, Spain
Activation-induced cell death is a process by which overactivated T
cells are eliminated, thus preventing potential autoimmune attacks. Two
known mediators of activation-induced cell death are Fas(CD95) ligand
(FasL) and APO2 ligand (APO2L)/TNF-related apoptosis-inducing ligand
(TRAIL). We show here that upon mitogenic stimulation, bioactive FasL
and APO2L are released from the T cell leukemia Jurkat and from normal
human T cell blasts as intact, nonproteolyzed proteins associated with
a particulate, ultracentrifugable fraction. We have characterized this
fraction as microvesicles of 100200 nm in diameter. These
microvesicles are released from Jurkat and T cell blasts shortly (
1
h) after PHA stimulation, well before the cell enters apoptosis. FasL-
and APO2L-containing vesicles are also present in supernatants from
PHA-activated fresh human PBMC. These observations provide the basis
for a new and efficient mechanism for the rapid induction of autocrine
or paracrine cell death during immune
regulation.
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L. Zamai, P. Secchiero, S. Pierpaoli, A. Bassini, S. Papa, E. S. Alnemri, L. Guidotti, M. Vitale, and G. Zauli TNF-related apoptosis-inducing ligand (TRAIL) as a negative regulator of normal human erythropoiesis Blood, June 15, 2000; 95(12): 3716 - 3724. [Abstract] [Full Text] [PDF] |
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E. S. Bergmann-Leitner and S. I. Abrams Differential Role of Fas/Fas Ligand Interactions in Cytolysis of Primary and Metastatic Colon Carcinoma Cell Lines by Human Antigen-Specific CD8+ CTL J. Immunol., May 1, 2000; 164(9): 4941 - 4954. [Abstract] [Full Text] [PDF] |
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A. D'Alessio, A. Riccioli, P. Lauretti, F. Padula, B. Muciaccia, P. De Cesaris, A. Filippini, S. Nagata, and E. Ziparo Testicular FasL is expressed by sperm cells PNAS, March 13, 2001; 98(6): 3316 - 3321. [Abstract] [Full Text] [PDF] |
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