The Lifeact-EGFP mouse is a translationally controlled fluorescent reporter of T cell activation

It has become increasingly evident that T cell functions are subject to translational control in addition to transcriptional regulation. Live imaging of CD8+ T cells isolated from the Lifeact-EGFP mouse reveals that they exhibit a gain in fluorescence intensity following engagement of cognate tumour...

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Published inJournal of cell science
Main Authors Galeano Niño, Jorge Luis, Tay, Szun S, Tearle, Jacqueline L E, Xie, Jianling, Govendir, Matt A, Kempe, Daryan, Mazalo, Jessica, Drew, Alexander P, Colakoglu, Feyza, Kummerfeld, Sarah K, Proud, Christopher G, Biro, Maté
Format Journal Article
LanguageEnglish
Published England 01.01.2020
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Abstract It has become increasingly evident that T cell functions are subject to translational control in addition to transcriptional regulation. Live imaging of CD8+ T cells isolated from the Lifeact-EGFP mouse reveals that they exhibit a gain in fluorescence intensity following engagement of cognate tumour target cells. The GFP signal increase is governed by Erk-dependent distal TCR signalling and its magnitude correlates with IFN-γ and TNF-α production, hallmarks of T cell activation. Enhanced fluorescence is due to increased translation of Lifeact-EGFP protein, without an associated increase in messenger RNA. Activation-induced gains in fluorescence are also observed in naïve and CD4+ T cells from the Lifeact-EGFP reporter, and are readily detected by both flow cytometry and live cell microscopy. This unique, translationally controlled reporter of effector T cell activation simultaneously enables tracking of cell morphology, F-actin dynamics and activation state in individual migrating T cells. It is a valuable addition to the limited number of reporters of T cell dynamics and activation, and opens the door to studies of translational activity and heterogeneities in functional T cell responses in situ.
AbstractList It has become increasingly evident that T cell functions are subject to translational control in addition to transcriptional regulation. Live imaging of CD8+ T cells isolated from the Lifeact-EGFP mouse reveals that they exhibit a gain in fluorescence intensity following engagement of cognate tumour target cells. The GFP signal increase is governed by Erk-dependent distal TCR signalling and its magnitude correlates with IFN-γ and TNF-α production, hallmarks of T cell activation. Enhanced fluorescence is due to increased translation of Lifeact-EGFP protein, without an associated increase in messenger RNA. Activation-induced gains in fluorescence are also observed in naïve and CD4+ T cells from the Lifeact-EGFP reporter, and are readily detected by both flow cytometry and live cell microscopy. This unique, translationally controlled reporter of effector T cell activation simultaneously enables tracking of cell morphology, F-actin dynamics and activation state in individual migrating T cells. It is a valuable addition to the limited number of reporters of T cell dynamics and activation, and opens the door to studies of translational activity and heterogeneities in functional T cell responses in situ.
Author Proud, Christopher G
Tay, Szun S
Xie, Jianling
Drew, Alexander P
Kempe, Daryan
Biro, Maté
Govendir, Matt A
Mazalo, Jessica
Galeano Niño, Jorge Luis
Tearle, Jacqueline L E
Kummerfeld, Sarah K
Colakoglu, Feyza
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  givenname: Szun S
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  givenname: Jacqueline L E
  surname: Tearle
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  givenname: Alexander P
  surname: Drew
  fullname: Drew, Alexander P
  organization: Kinghorn Centre for Clinical Genomics, Garvan Institute of Medical Research, Sydney, NSW, Australia
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  givenname: Feyza
  surname: Colakoglu
  fullname: Colakoglu, Feyza
  organization: EMBL Australia, Single Molecule Science node, School of Medical Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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  organization: St Vincent's Clinical School, University of New South Wales, Sydney NSW, Australia
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  givenname: Christopher G
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  organization: School of Biological Sciences, University of Adelaide, Frome Road, Adelaide, Australia
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  givenname: Maté
  orcidid: 0000-0001-5852-3726
  surname: Biro
  fullname: Biro, Maté
  organization: ARC Centre of Excellence in Advanced Molecular Imaging, University of New South Wales, Sydney, NSW 2052, Australia
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Keywords Flow cytometry
Translation
T cell activation
Actin
Lifeact
Live imaging
Language English
License 2020. Published by The Company of Biologists Ltd.
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