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International Immunology, Vol. 12, No. 12, 1685-1693, December 2000
© 2000 Japanese Society for Immunology

HSP70 from Trypanosoma cruzi is endowed with specific cell proliferation potential leading to apoptosis

Concepción Marañón, Lourdes Planelles, Carlos Alonso1 and Manuel Carlos López

Departamento de Biología Molecular, Instituto de Parasitología y Biomedicina `López Neyra', CSIC, Calle Ventanilla 11, 18001 Granada, Spain
1 Centro de Biología Molecular `Severo Ochoa', CSIC UAM, 28049 Madrid, Spain

Correspondence to: M. C. López

The Trypanosoma cruzi HSP70 recombinant protein has the capacity to stimulate splenocytes or lymph node cells from naive mice in a non-haplotype-restricted way. The proliferative response is abolished by proteinase K digestion and by specific anti-HSP70 antibodies. The induced stimulation index was maximal after 24 h of incubation with the protein. This stimulation leads to cell death in a Fas–Fas ligand-independent way. The phenotype of the expanded cells was CD3+ TCR{alpha}ß+ CD4+. HSP70-responsive cells express a broad range of cytokines including IFN-{gamma}, IL-2 and tumor necrosis factor-{alpha}. After 48 h of incubation with HSP70 there was a significant increase in relative intracellular levels of CD3 TCR{alpha}ß receptors. The expanded CD4+ cell population expressed CD25; however, in contrast to concanavalin A-treated culture, delayed CD44 expression was observed.

Keywords: activation markers, cell death, Fas, Fas ligand, HSP70, lymph node, mitogenic T cell activation, naive mice, splenocytes

Transmitting editor: C. Terhorst


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