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The Journal of Immunology, 2001, 167: 6736-6744.
Copyright © 2001 by The American Association of Immunologists

Differential Secretion of Fas Ligand- or APO2 Ligand/TNF-Related Apoptosis-Inducing Ligand-Carrying Microvesicles During Activation-Induced Death of Human T Cells1

Inmaculada Monleón2,*, María José Martínez-Lorenzo2,{dagger}, Luis Monteagudo{ddagger}, Pilar Lasierra{dagger}, Marta Taulés§, María Iturralde*, Andrés Piñeiro*, Luis Larrad{dagger}, María Angeles Alava*, Javier Naval* and Alberto Anel3,*

* Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, {dagger} Servicio de Inmunología, Hospital Clínico Universitario, and {ddagger} Departamento de Anatomía, Embriología y Genética, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain; and § Serveis Científico-Tècnics, Facultat de Medicina, Universitat de Barcelona, Barcelona, Spain

Preformed Fas ligand (FasL) and APO2 ligand (APO2L)/TNF-related apoptosis-inducing ligand (TRAIL) are stored in the cytoplasm of the human Jurkat T cell line and of normal human T cell blasts. The rapid release of these molecules in their bioactive form is involved in activation-induced cell death. In this study, we show by confocal microscopy that FasL and APO2L/TRAIL are mainly localized in lysosomal-like compartments in these cells. We show also by immunoelectron microscopy that FasL and APO2L/TRAIL are stored inside cytoplasmic compartments ~500 nm in diameter, with characteristics of multivesicular bodies. Most of these compartments share FasL and APO2L/TRAIL, although exclusive APO2L/TRAIL labeling can be also observed in separate compartments. Upon PHA activation, the mobilization of these compartments toward the plasma membrane is evident, resulting in the secretion of the internal microvesicles loaded with FasL and APO2L/TRAIL. In the case of activation with anti-CD59 mAb, the secretion of microvesicles labeled preferentially with APO2L/TRAIL predominates. These data provide the basis of a new and efficient mechanism for the rapid induction of autocrine or paracrine cell death during immune regulation and could modify the interpretation of the role of FasL and APO2L/TRAIL as effector mechanisms in physiological and pathological situations.




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