Visualization of Cytolytic T Cell Differentiation and Granule Exocytosis with T Cells from Mice Expressing Active Fluorescent Granzyme B
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To evaluate acquisition and activation of cytolytic functions during immune responses we generated knock in (KI) mice expressing Granzyme B (GZMB) as a fusion protein with red fluorescent tdTomato (GZMB-Tom). As for GZMB in wild type (WT) lymphocytes, GZMB-Tom was absent from naïve CD8 and CD4 T cells in GZMB-Tom-KI mice. It was rapidly induced in most CD8 T cells and in a subpopulation of CD4 T cells in response to stimulation with antibodies to CD3/CD28. A fraction of splenic NK cells expressed GZMB-Tom ex vivo with most becoming positive upon culture in IL-2. GZMB-Tom was present in CTL granules and active as a protease when these degranulated into cognate target cells, as shown with target cells expressing a specific FRET reporter construct. Using T cells from mice expressing GZMB-Tom but lacking perforin, we show that the transfer of fluorescent GZMB-Tom into target cells was dependent on perforin, favoring a role for perforin in delivery of GZMB at the target cells' plasma membranes. Time-lapse video microscopy showed Ca++ signaling in CTL upon interaction with cognate targets, followed by relocalization of GZMB-Tom-containing granules to the synaptic contact zone. A perforin-dependent step was next visualized by the fluorescence signal from the non-permeant dye TO-PRO-3 at the synaptic cleft, minutes before the labeling of the target cell nucleus, characterizing a previously undescribed synaptic event in CTL cytolysis. Transferred OVA-specific GZMB-Tom-expressing CD8 T cells acquired GZMB-Tom expression in Listeria monocytogenes-OVA infected mice as soon as 48h after infection. These GZMB-Tom positive CD8 T cells localized in the splenic T-zone where they interacted with CD11c positive dendritic cells (DC), as shown by GZMB-Tom granule redistribution to the T/DC contact zone. GZMB-Tom-KI mice thus also provide tools to visualize acquisition and activation of cytolytic function in vivo.
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Cytolytic granule polarization and degranulation are two steps in lymphocyte-mediated cytotoxicity.
“Cytolytic granule polarization and degranulation are two steps in lymphocyte-mediated cytotoxicity(Bryceson, March, Barber, Ljunggren, & Long, 2005;Mouchacca, Schmitt-Verhulst, & Boyer, 2013).”
From Cuprizone‐induced demyelination triggers a <scp>CD8</scp>‐pronounced T cell recruitment (2021) · cites this paper as Mouchacca, Schmitt-Verhulst, & Boyer, 2013
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- Authors
- Mouchacca, P., Schmitt-Verhulst, A.-M., & Boyer, C.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- Corresponding author
- Boyer, Claude
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2013-06-28
- Volume
- 8
- Issue
- 6
- Pages
- e67239
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC3695958
- OpenAlex
- W2046188384
- Cited by
- 29
- References
- 0
- Citations by year
- 2026: 2 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 1 · 2021: 3 · 2020: 3 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 2 · 2015: 4 · 2014: 3
- FWCI
- 1.66
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Figshare (submittedVersion, cc-by)
- Funders
- Association pour la Recherche sur le Cancer
- Institut National de la Santé et de la Recherche Médicale
- Centre National de la Recherche Scientifique
- Institut National Du Cancer
- Topics
- Life Sciences › Immunology and Microbiology › Immunology › T-cell and B-cell Immunology
- Life Sciences › Immunology and Microbiology › Immunology › Immune Cell Function and Interaction
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Keywords
- granzyme B, cytotoxic T lymphocytes, granule exocytosis, perforin, CD8+ T cell differentiation, CD4+ T cells, natural killer cells, synaptogenesis, calcium signaling, T cell activation, dendritic cells, Listeria monocytogenes infection, fluorescent protein fusion, cytotoxicity
- MeSH terms
- Red Fluorescent Protein, Animals, Cell Differentiation, Cells, Cultured, Killer Cells, Natural, Kinetics, Listeriosis, Luminescent Proteins, Lymph Nodes, Lymphocyte Activation, Mice, Inbred BALB C, Mice, Inbred C57BL, Mice, Transgenic, Microscopy, Fluorescence, Recombinant Fusion Proteins, T-Lymphocytes, Cytotoxic, Cell Degranulation, Gene Expression, Microscopy, Confocal, Secretory Vesicles, Mice, Granzymes, Gene Knock-In Techniques, Single-Cell Analysis
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