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Bijnen M, Bajénoff M. Gland Macrophages: Reciprocal Control and Function within Their Niche. Trends Immunol 2021; 42:120-136. [PMID: 33423933 DOI: 10.1016/j.it.2020.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 11/30/2022]
Abstract
The human body contains dozens of endocrine and exocrine glands, which regulate physiological processes by secreting hormones and other factors. Glands can be subdivided into contiguous tissue modules, each consisting of an interdependent network of cells that together perform particular tissue functions. Among those cells are macrophages, a diverse type of immune cells endowed with trophic functions. In this review, we discuss recent findings on how resident macrophages support tissue modules within glands via the creation of mutually beneficial cell-cell circuits. A better comprehension of gland macrophage function and local control within their niche is essential to achieve a refined understanding of gland physiology in homeostasis and disease.
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Affiliation(s)
- Mitchell Bijnen
- Aix Marseille University, CNRS, INSERM, Centre d'Immunologie de Marseille-Luminy, Marseille, France.
| | - Marc Bajénoff
- Aix Marseille University, CNRS, INSERM, Centre d'Immunologie de Marseille-Luminy, Marseille, France
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Hsu HP, Chen YT, Chen YY, Lin CY, Chen PY, Liao SY, Lim CCY, Yamaguchi Y, Hsu CL, Dzhagalov IL. Heparan sulfate is essential for thymus growth. J Biol Chem 2021; 296:100419. [PMID: 33600795 PMCID: PMC7974028 DOI: 10.1016/j.jbc.2021.100419] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 02/03/2021] [Accepted: 02/11/2021] [Indexed: 12/21/2022] Open
Abstract
Thymus organogenesis and T cell development are coordinated by various soluble and cell-bound molecules. Heparan sulfate (HS) proteoglycans can interact with and immobilize many soluble mediators, creating fields or gradients of secreted ligands. While the role of HS in the development of many organs has been studied extensively, little is known about its function in the thymus. Here, we examined the distribution of HS in the thymus and the effect of its absence on thymus organogenesis and T cell development. We found that HS was expressed most abundantly on the thymic fibroblasts and at lower levels on endothelial, epithelial, and hematopoietic cells. To study the function of HS in the thymus, we eliminated most of HS in this organ by genetically disrupting the glycosyltransferase Ext1 that is essential for its synthesis. The absence of HS greatly reduced the size of the thymus in fetal thymic organ cultures and in vivo, in mice, and decreased the production of T cells. However, no specific blocks in T cell development were observed. Wild-type thymic fibroblasts were able to physically bind the homeostatic chemokines CCL19, CCL21, and CXCL12 ex vivo. However, this binding was abolished upon HS degradation, disrupting the CCL19/CCL21 chemokine gradients and causing impaired migration of dendritic cells in thymic slices. Thus, our results show that HS plays an essential role in the development and growth of the thymus and in regulating interstitial cell migration.
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Affiliation(s)
- Hsuan-Po Hsu
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Yun-Tzu Chen
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Yu-Ying Chen
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Chih-Yu Lin
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Po-Yu Chen
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Shio-Yi Liao
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | | | - Yu Yamaguchi
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, California, USA
| | - Chia-Lin Hsu
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan
| | - Ivan L Dzhagalov
- Institute of Microbiology and Immunology, National Yang-Ming University, Taipei, Taiwan.
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53
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Trzebanski S, Jung S. Plasticity of monocyte development and monocyte fates. Immunol Lett 2020; 227:66-78. [PMID: 32814154 DOI: 10.1016/j.imlet.2020.07.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Revised: 07/30/2020] [Accepted: 07/31/2020] [Indexed: 01/01/2023]
Abstract
Monocytes are circulating myeloid immune precursor cells that are generated in the bone marrow. Mature monocytes are released into the circulation and, in case of need, recruited to peripheral sites of inflammation to differentiate into monocyte-derived effector cells. In absence of overt inflammation, monocytes also extravasate into selected tissues, where they complement tissue-resident macrophage compartments. Adjustment of these homeostatic monocyte infiltrates to local environment is critical to maintain health, as best established for the intestine. Defined gene expression changes that differ between gut segments presumably help strike the fine balance between the crucial function of these monocyte-derived macrophages as tissue rheostats and their detrimental hyperactivation. Environmental factors that dictate local monocyte differentiation remain incompletely understood. Definition of the latter could aid our general understanding of in vivo monocyte functions and their relation to inflammatory disorders. In this review, we summarize recent advances in our understanding of monocyte subsets, their differentiation into tissue macrophages, and selected contributions of monocyte-derived cells to steady-state physiology. Moreover, we will discuss emerging evidence for an intriguing bifurcation of monocyte development in the bone marrow and potential functional implications. Emphasis will be given to points of controversies, but we will largely focus on the healthy organism. For a discussion of monocyte and macrophage contributions to inflammatory conditions, we refer the reader to other dedicated reviews.
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Affiliation(s)
| | - Steffen Jung
- Department of Immunology, Weizmann Institute of Science, Rehovot 76100, Israel.
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Briand-Mésange F, Pons V, Allart S, Masquelier J, Chicanne G, Beton N, Payrastre B, Muccioli GG, Ausseil J, Davignon JL, Salles JP, Chap H. Glycerophosphodiesterase 3 (GDE3) is a lysophosphatidylinositol-specific ectophospholipase C acting as an endocannabinoid signaling switch. J Biol Chem 2020; 295:15767-15781. [PMID: 32917725 DOI: 10.1074/jbc.ra120.015278] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 09/03/2020] [Indexed: 12/11/2022] Open
Abstract
Endocannabinoid signaling plays a regulatory role in various (neuro)biological functions. 2-arachidonoylglycerol (2-AG) is the most abundant endocannabinoid, and although its canonical biosynthetic pathway involving phosphoinositide-specific phospholipase C and diacylglycerol lipase α is known, alternative pathways remain unsettled. Here, we characterize a noncanonical pathway implicating glycerophosphodiesterase 3 (GDE3, from GDPD2 gene). Human GDE3 expressed in HEK293T cell membranes catalyzed the conversion of lysophosphatidylinositol (LPI) into monoacylglycerol and inositol-1-phosphate. The enzyme was equally active against 1-acyl and 2-acyl LPI. When using 2-acyl LPI, where arachidonic acid is the predominant fatty acid, LC-MS analysis identified 2-AG as the main product of LPI hydrolysis by GDE3. Furthermore, inositol-1-phosphate release into the medium occurred upon addition of LPI to intact cells, suggesting that GDE3 is actually an ecto-lysophospholipase C. In cells expressing G-protein-coupled receptor GPR55, GDE3 abolished 1-acyl LPI-induced signaling. In contrast, upon simultaneous ex-pression of GDE3 and cannabinoid receptor CB2, 2-acyl LPI evoked the same signal as that induced by 2-AG. These data strongly suggest that, in addition to degrading the GPR55 LPI ligand, GDE3 can act as a switch between GPR55 and CB2 signaling. Coincident with a major expression of both GDE3 and CB2 in the spleen, spleens from transgenic mice lacking GDE3 displayed doubling of LPI content compared with WT mice. Decreased production of 2-AG in whole spleen was also observed, supporting the in vivo relevance of our findings. These data thus open a new research avenue in the field of endocannabinoid generation and reinforce the view of GPR55 and LPI being genuine actors of the endocannabinoid system.
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Affiliation(s)
- Fabienne Briand-Mésange
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Véronique Pons
- Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Sophie Allart
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Julien Masquelier
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group, Louvain Drug Research Institute, Catholic University of Louvain, Brussels, Belgium
| | - Gaëtan Chicanne
- Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Nicolas Beton
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Bernard Payrastre
- Institute of Metabolic and Cardiovascular Diseases, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Giulio G Muccioli
- Bioanalysis and Pharmacology of Bioactive Lipids Research Group, Louvain Drug Research Institute, Catholic University of Louvain, Brussels, Belgium
| | - Jérôme Ausseil
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Jean-Luc Davignon
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Jean-Pierre Salles
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France
| | - Hugues Chap
- Center for Physiopathology of Toulouse Purpan, University of Toulouse, Toulouse, France; National Center for Scientific Research, Toulouse, France; National Institute of Health and Medical Research, Paul Sabatier University, Toulouse, France.
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