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Cited by 390

The DOI matches its Crossref record; 44 of the 44 references it cites were found in a registry or an index.

Early Activation of Caspases during T Lymphocyte Stimulation Results in Selective Substrate Cleavage in Nonapoptotic Cells

Open access
Alam, Antoine, Cohen, Luchino Y., Aouad, Salah, Sékaly, Rafick-Pierre·1999·The Journal of Experimental Medicine

Abstract

Apoptosis induced by T cell receptor (TCR) triggering in T lymphocytes involves activation of cysteine proteases of the caspase family through their proteolytic processing. Caspase-3 cleavage was also reported during T cell stimulation in the absence of apoptosis, although the physiological relevance of this response remains unclear. We show here that the caspase inhibitor benzyloxycarbonyl (Cbz)-Val-Ala-Asp(OMe)-fluoromethylketone (zVAD) blocks proliferation, major histocompatibility complex class II expression, and blastic transformation during stimulation of peripheral blood lymphocytes. Moreover, T cell activation triggers the selective processing and activation of downstream caspases (caspase-3, -6, and -7), but not caspase-1, -2, or -4, as demonstrated even in intact cells using a cell-permeable fluorescent substrate. Caspase-3 processing occurs in different T cell subsets (CD4+, CD8+, CD45RA+, and CD45RO+), and in activated B lymphocytes. The pathway leading to caspase activation involves death receptors and caspase-8, which is also processed after TCR triggering, but not caspase-9, which remains as a proenzyme. Most importantly, caspase activity results in a selective substrate specificity, since poly(ADP-ribose) polymerase (PARP), lamin B, and Wee1 kinase, but not DNA fragmentation factor (DFF45) or replication factor C (RFC140), are processed. Caspase and substrate processing occur in nonapoptotic lymphocytes. Thus, caspase activation is an early and physiological response in viable, stimulated lymphocytes, and appears to be involved in early steps of lymphocyte activation.

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Metadata

Authors
Alam, A., Cohen, L. Y., Aouad, S., & Sékaly, R.-P.
Venue
The Journal of Experimental Medicine
Published
1999-12-20
Volume
190
Issue
12
Pages
1879-1890
ISSN
  • 0022-1007 (ISSN-L)
  • 1540-9538
OpenAlex
W2007939817
Cited by
390
References
44
FWCI
9.03
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: Early Activation of Caspases during T Lymphocyte Stimulation Results in Selective Substrate Cleavage in Nonapoptotic Cells. https://app.cochat.ai/papers/10.1084/jem.190.12.1879
The paper
Alam, A., Cohen, L. Y., Aouad, S., & Sékaly, R.-P. (1999). Early Activation of Caspases during T Lymphocyte Stimulation Results in Selective Substrate Cleavage in Nonapoptotic Cells. The Journal of Experimental Medicine. https://doi.org/10.1084/jem.190.12.1879

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

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