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Sunday, July 26, 2020 | History

4 edition of The regulation of T/B lineage commitment by Lunatic Fringe and Notch1 found in the catalog.

The regulation of T/B lineage commitment by Lunatic Fringe and Notch1

Tyler Lacombe

The regulation of T/B lineage commitment by Lunatic Fringe and Notch1

by Tyler Lacombe

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  • 17 Currently reading

Published by National Library of Canada in Ottawa .
Written in English


Edition Notes

Thesis (M.Sc.) -- University of Toronto, 2001.

SeriesCanadian theses = -- Thèses canadiennes
The Physical Object
FormatMicroform
Pagination1 microfiche : negative. --
ID Numbers
Open LibraryOL19083462M
ISBN 100612588246
OCLC/WorldCa52574378

  U Koch, T.A Lacombe, D Holland, J.L Bowman, B.L Cohen, S.E Egan, C.J GuidosSubversion of the T/B lineage decision in the thymus by lunatic fringe-mediated inhibition of Notch-1 Immunity, 15 (), pp.   Koch, U. et al. Subversion of the T/B lineage decision in the thymus by lunatic fringe-mediated inhibition of Notch Immun – (). CAS PubMed Google Scholar.

Recent studies by Wilson et al. 9 on the ablation of Notch-1 in adult mice are best compatible with the view that normally Notch-1 instructs T cell lineage commitment and that in its absence B cell development takes over: after inactivation of Notch-1 in lymphoid precursors the DN 1, 2, and 3 thymocyte subsets were rapidly diminished and in the. 1 Introduction. T cells develop from pluripotent hematopoietic stem cells through a series of differentiation steps. Common lymphoid progenitors (CLP) migrate into the thymus where they give rise to the T cell lineage whilst retaining the capacity to generate B and NK cells entiating thymocytes can be divided into four main subsets based on their expression of CD4 and CD8 coreceptors.

Notch1 activation is essential for T-lineage specification of lymphomyeloid progenitors seeding the thymus. Progression along the T cell lineage further requires cooperative signaling provided by the interleukin 7 receptor (IL-7R), but the molecular mechanisms responsible for the dynamic and lineage-specific regulation of IL-7R during thymopoiesis are unknown. Koch U, Fiorini E, Benedito R et al. Delta-like 4 is the essential, nonredundant ligand for Notch1 during thymic T-cell lineage commitment. J Exp Med ; (11)– PubMed Google Scholar.


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The regulation of T/B lineage commitment by Lunatic Fringe and Notch1 by Tyler Lacombe Download PDF EPUB FB2

Notch1 activation regulates T lineage commitment and early T cell development. Fringe glycosyltransferases alter the sensitivity of Notch Cited by:   Summary: Intrathymic Notch1 signaling critically regulates T‐lineage specification and commitment as well as T‐cell progenitor survival and differentiation.

Notch1 activation is continuously required during progression of early CD4/CD8‐double‐negative thymocytes to the CD4/CD8‐double‐positive by:   Lunatic Fringe (Lfng) enhances Notch1 activation by Delta-like 4 (DL4) to promote Notch1-dependent T-lineage commitment of thymus-seeding progenitors.

Subsequently, Notch1 and T-cell receptor-β (TCRβ)–containing pre-TCR complexes signal CD4/CD8 double-negative 3 (DN3) committed T-cell progenitors to survive, proliferate, and differentiate Cited by: Regulation of T lymphopoiesis by Notch1 and Lunatic fringe–mediated competition for intrathymic niches I oana Visan, J oanne B T an, Julie S Y uan, James A H arper, U te K och & C ynthia J Guidos.

Regulation of T lymphopoiesis by Notch1 and Lunatic fringe-mediated competition for intrathymic niches. Visan I, Tan JB, Yuan JS, Harper JA, Koch U, Guidos CJ. Nat Immunol, 7(6), 14 May Cited by 61 articles | PMID:   T-lineage commitment requires Notch1-mediated signaling (20–26).

Four mammalian Notch receptors have been identified, designated as Notch1–4. Notch receptors are activated upon interacting with different ligands, named Delta-like 1 (DL1).

Notch1 activation by Delta-like (DL) Notch ligands is essential to induce T cell commitment and to suppress B cell development from thymus-seeding progenitors.

Thymus-seeding progenitor competition for DL4 is critically regulated by Lunatic Fringe (Lfng), which glycosylates epidermal growth factor repeats in the Notch1 extracellular domain to. The Lunatic fringe expression domains overlapped only partly with the expression of Notch1 and Notch2, which were coexpressed with Hes1.

We examined the regulation of Lunatic fringe and Hes1 in cultured explants of dental epithelium. The expression of Lunatic fringe and Hes1 depended on mesenchymal signals and both were positively regulated by.

Notch-1 signaling is essential for lymphoid progenitors to undergo T cell commitment, but the mechanism has not been defined.

Here we show that thymocytes ectopically expressing Lunatic Fringe, a modifier of Notch-1 signaling, induce lymphoid progenitors to develop into B cells in the thymus. This cell fate switch resulted from Lunatic Fringe-mediated inhibition of Notch-1 function, as.

Notch1 continues to be expressed and activated (9, 10) after thymus-seeding progenitors lose B cell potential and progress through the CD4/CD8 double negative (DN) phases of T cell itors that successfully rearrange TCRγ and TCRδ usually remain DN and adopt the γδT cell fate.

In contrast, DN3 thymocytes that successfully rearrange TCRβ form pre-TCR complexes. Further support for the essential role of Notch signaling in T cell lineage commitment is derived from gain-of-function studies, as overexpression of a constitutively active form of N1 (21, 22) or DL4 (13, 23, 24) induces ectopic T cell development in the BM and simultaneously blocks B cell development.

Thus, these reciprocal loss- and gain-of. Thus, we hypothesized that ectopic Lunatic Fringe antagonizes Notch-1 activation in thymic LP, thereby inhibiting T cell commitment and promoting intrathymic B cell development.

It is well documented that subtle changes in the amount of Notch can have profound influences on cell fate choices Heitzler and SimpsonArtavanis-Tsakonas et al. Request PDF | Regulation of intrathymic T-cell development by Lunatic Fringe- Notch1 interactions | Intrathymic Notch1 signaling critically regulates T-lineage specification and commitment as well.

Lunatic Fringe Controls T Cell Differentiation through Modulating Notch Signaling. lineage commitment stage B). The down-regulation of Lfng in FL-HSC decreased the relative.

T cell progenitors lacking Lunatic Fringe can respond to OP9/DL-1, but they are more sensitive to GSI than wild-type progenitors (unpublished data).

Collectively these findings reveal that Lunatic Fringe–Notch1 interactions regulate T cell progenitor competition for limiting DLs in vivo. T-lineage commitment requires Notch1-mediated signaling (20 Nrarp, and Lunatic Fringe, inhibit T cell maturation at a similar stage (29 Regulation of αβ/γδ T cell lineage commitment and peripheral T cell responses by Notch/RBP-J signaling.

Immunity. –   4. The role of Notch ligands in T cell commitment. The availability of Notch ligands in the prethymic as opposed to the intrathymic environment is also an important issue in relation to the established role of Notch signalling in the commitment of lymphoid progenitors to the T rather than the B cell lineage, as reviewed elsewhere in this issue.

Lunatic Fringe (Lfng) enhances Notch1 activation by Delta-like 4 (DL4) to promote Notch1-dependent T-lineage commitment of thymus-seeding progenitors. Notch1 signaling suppresses B cell development and promotes T lineage commitment in thymus-seeding hematopoietic progenitors.

Notch1 is also activated in early T cell progenitors, but the. Notch1 signaling is required for T cell lineage commitment and the CD4 – CD8 – double negative (DN) to CD4 + CD8 + double positive (DP) transition 14 – 16, (reviewed in 17, 18). There is evidence in the literature for Notch1 pushing DP thymocytes to develop into CD8 + SP thymocytes, although these data are controversial.

T cell progenitors show stage- and lineage-specific Notch dependence. Ciofani et al. used the OP9/DL-1 culture system to define the developmental stage at which the αβ and γδ T cell lineages first diverge by assessing the clonogenic frequency of αβ-committed, γδ-committed, and αβ/γδ bipotential progenitors ().In these in vitro analyses, all DN1 thymocytes were bipotent, in contrast.Notch1 signaling drives T cell development at the expense of B cell development from a common precursor, an effect that is dependent on a C-terminal Notch1 transcriptional activation domain.

The function of Deltex1, initially identified as a positive modulator of Notch function in a genetic screen in Drosophila, is poorly understood. We now demonstrate that, in contrast to Notch1, enforced. Arguably, the strongest data supporting a physiological role for Notch in T-cell fate decisions come from studies of the choice between T-cell fate versus B-cell fate made at the common lymphoid progenitor stage.

Both overexpression and knockout approaches indicate that Notch1 promotes T-cell lineage fate at the expense of B-cell lineage fate.