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To Be, Or Notch to Be: Mediating Cell Fate from Embryogenesis to Lymphopoiesis

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To Be, Or Notch to Be: Mediating Cell Fate from Embryogenesis to Lymphopoiesis biomolecules Review To Be, or Notch to Be: Mediating Cell Fate from Embryogenesis to Lymphopoiesis Han Leng Ng 1,2, Elizabeth Quail 2,3, Mark N. Cruickshank 2 and Daniela Ulgiati 2,* 1 Centre for Haematology, Department of Immunology and Inflammation, Faculty of Medicine, Imperial College London, Du Cane Road, London W12 0NN, UK; [email protected] 2 School of Biomedical Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia; [email protected] (E.Q.); [email protected] (M.N.C.) 3 School of Molecular Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia * Correspondence: [email protected]; Tel.: +61-8-6457-1076 Abstract: Notch signaling forms an evolutionarily conserved juxtacrine pathway crucial for cellular development. Initially identified in Drosophila wing morphogenesis, Notch signaling has since been demonstrated to play pivotal roles in governing mammalian cellular development in a large variety of cell types. Indeed, abolishing Notch constituents in mouse models result in embryonic lethality, demonstrating that Notch signaling is critical for development and differentiation. In this review, we focus on the crucial role of Notch signaling in governing embryogenesis and differentiation of multiple progenitor cell types. Using hematopoiesis as a diverse cellular model, we highlight the role of Notch in regulating the cell fate of common lymphoid progenitors. Additionally, the influence of Notch through microenvironment interplay with lymphoid cells and how dysregulation influences disease processes is explored. Furthermore, bi-directional and lateral Notch signaling between ligand Citation: Ng, H.L.; Quail, E.; expressing source cells and target cells are investigated, indicating potentially novel therapeutic Cruickshank, M.N.; Ulgiati, D. To Be, or Notch to Be: Mediating Cell Fate options for treatment of Notch-mediated diseases. Finally, we discuss the role of cis-inhibition in from Embryogenesis to regulating Notch signaling in mammalian development. Lymphopoiesis. Biomolecules 2021, 11, 849. https://doi.org/10.3390/ Keywords: Notch signaling; B cell; development; leukemia biom11060849 Academic Editor: Vladimir N. Uversky 1. Introduction Development of progenitor stem cells to highly specialized cell types requires tight Received: 7 May 2021 regulation and orchestration of multiple signals. The evolutionarily conserved Notch Accepted: 4 June 2021 pathway, first identified in mutated fruit flies with notches in their wings, is also involved Published: 7 June 2021 in development of sensory organs of the peripheral nervous system [1,2]. In mammals, Notch signaling dictates the fate of multiple cell types during development of the embryo Publisher’s Note: MDPI stays neutral (embryogenesis and somitogenesis), including the central nervous system (neurogenesis with regard to jurisdictional claims in and gliogenesis), cardiovascular system (cardiogenesis), and pancreatic system (pancreatic published maps and institutional affil- organogenesis), as well as hematopoiesis [2,3]. In this review, we present studies showing iations. a fundamental role for Notch signaling in regulating development during embryogenesis and mediating cell fate decisions of common lymphoid progenitors towards the B cell lineage. Additionally, we explore bi-directional, lateral induction and cis-inhibition of Notch signaling in the context of development and disease progression. Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. 2. The Notch Signaling Pathway This article is an open access article Humans and most other mammals express four Notch receptors (NOTCH1-4) and distributed under the terms and five families of Notch ligand; DELTA-LIKE1 (DLL1), DELTA-LIKE3 (DLL3), DELTA-LIKE4 conditions of the Creative Commons Attribution (CC BY) license (https:// (DLL4), JAGGED1, and JAGGED2 [2,3] (Figure1). creativecommons.org/licenses/by/ 4.0/). Biomolecules 2021, 11, 849. https://doi.org/10.3390/biom11060849 https://www.mdpi.com/journal/biomolecules Biomolecules 2021, 11, x FOR PEER REVIEW 2 of 19 Biomolecules 2021, 11, 849 2 of 19 Figure 1. Structure of Notch receptors and ligands. (A) The four human Notch receptors (NOTCH1-4) are structurally Figure 1. Structure of Notch receptors and ligands. (A) The four human Notch receptors (NOTCH1-4) are structurally similar.similar. All All receptors receptors possess possess extracellular extracellular domains, domains, and and all all four four receptors receptors share share similarity similarity in in the the intracellular intracellular domain, domain, bu butt NOTCH4NOTCH4 lacks t thehe TAD domain.domain. ((BB)) All All human human Notch Notch ligands ligands of of both both the the Delta-Like Delta-Like and and Jagged Jagged families families contain contain a DSL. a DSL. The TheNotch Notch ligand ligand families families can becan distinguished be distinguished by the by number the number of EGF-like of EGF extracellular-like extracellular domains. domains. Unique Unique to the Jagged to the family Jagged is familya 24 amino is a 24 acid amino insertion acid insertion between thebetween 10th and the 11th10th EGF-likeand 11th domainsEGF-like ofdomains JAGGED1 of JAGGED1 and JAGGED2. and JAGGED2. The cysteine-rich The cysteine region- richis another region uniqueis another feature unique of the feature Jagged of the family Jagged ligands. family At ligands. the C-terminus At the C of-terminus DLL1, DLL4, of DLL1, and DLL4 JAGGED1, and isJAGGED1 a PDZ motif. is a PDZEGF: motif. Epidermal EGF: growthEpidermal factor; growth LNR: factor;lin-12/Notch LNR: linrepeats;-12/Notch HD: repeats; Heterodimerization HD: Heterodimerization domain; NRR: domain; Negative NRR: regulatory Negative regulatoryregion; RAM: region; RBPj RAM:κ association RBPjκ association module; NLS: module; Nuclear NLS: localization Nuclear localization signal; TAD: signal; Transcriptional TAD: Transcriptional activation domain;activation PEST: do- main; PEST: Proline (P), Glutamic acid (E), Serine (S), Threonine (T) rich domain; DLL: Delta-like; DSL: Delta/Ser- Proline (P), Glutamic acid (E), Serine (S), Threonine (T) rich domain; DLL: Delta-like; DSL: Delta/Serrate/LAG- 2 domain; rate/LAG- 2 domain; PDZ: Post synaptic density protein (PSD95), Drosophila disc large tumor suppressor (Dlg1), and PDZ: Post synaptic density protein (PSD95), Drosophila disc large tumor suppressor (Dlg1), and Zonula occludens-1 (ZO-1). Zonula occludens-1 (ZO-1). Activation of the Notch signaling pathway requires physical interaction between Activation of the Notch signaling pathway requires physical interaction between a a Notch receptor and its cognate ligand, which elicit cell-context dependent responses Notch receptor and its cognate ligand, which elicit cell-context dependent responses and and initiate the Notch signaling pathway [4,5] (Figure2). Several crystallographic and initiate the Notch signaling pathway [4,5] (Figure 2). Several crystallographic and func- functional studies show that interaction between the Delta/Serrate/lag-2 (DSL) domain tionalof the studies Notch ligandshow that and interaction the epidermal between growth the factor Delta/Serrate/lag (EGF)-like domains-2 (DSL) 11 domain and 12 of of the the NotchNotch ligand receptor and is the requisite epidermal for Notchgrowth pathway factor (EGF) activation-like domains [6,7]. Isolated 11 and protein12 of the crystals Notch receptorprovide is evidence requisite of for interaction Notch pathway between activation NOTCH1 [ EGF11-136,7]. Isolated and protein DLL4, incrystals an antiparallel provide evidencemanner [of8,9 interaction]. between NOTCH1 EGF11-13 and DLL4, in an antiparallel manner [8,9]. Gordon and co-workers [10] showed through crystallographic studies that in its un- bound state, NOTCH2 lin-12/Notch repeats (LNR) wrap around the heterodimerization Biomolecules 2021, 11, x FOR PEER REVIEW 3 of 19 domain (HD) to sterically inhibit S2 cleavage. Upon receptor-ligand interaction, the ligand “pulls” the receptor, thereby exposing the negative regulatory region (NRR) at a specific site for S2 cleavage [11] (Figure 2). Parks and colleagues [11] hypothesized that endocyto- sis of the bound receptor-ligand was crucial for the activation of the Notch pathway. This was supported by in vivo evidence generated by Nichols and co-workers [12] utilizing murine cell lines. The S2 cleavage step is the rate-limiting step for release of the Notch intracellular domain (NIC) and occurs on the surface of the Notch-activated cell [13,14] (Figure 2). Two metalloproteases of the A Disintegrin and Metalloproteases (ADAM) fam- ily are involved in S2 cleavage: ADAM10 and ADAM17/TNF-α converting enzyme (TACE) [13,15]. Knockout of either Adam10 or Tace is embryonically lethal, with Adam10 knockout embryos showing similar defects to the Notch receptor knockouts [16,17] (Table 1). Further evidence suggests the mechanism of S2 cleavage is cell context-dependent, Biomolecules 2021, 11, 849 with varying degrees of severity and different cell types impacted at various stages3 of of 19 development [13,15]. Figure 2. Trans-interaction of receptor and ligand activation of Notch signaling results in the transcription of CBF1-bound Figure 2. Trans-interaction of receptor and ligand activation of Notch signaling results in the transcription of CBF1-bound Notch target genes. Interaction of DELTA-LIKE1 (DLL1) DSL domain with the 10th and 11th EGF-like domain activates Notch target genes. Interaction of DELTA-LIKE1
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