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Arao Y, Stumpo DJ, Hoenerhoff MJ, Tighe RM, Yu YR, Sutton D, Kashyap A, Beerman I, Blackshear PJ. Lethal eosinophilic crystalline pneumonia in mice expressing a stabilized Csf2 mRNA. FASEB J 2023; 37:e23100. [PMID: 37462673 DOI: 10.1096/fj.202300757r] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 06/29/2023] [Accepted: 07/05/2023] [Indexed: 07/21/2023]
Abstract
Granulocyte-macrophage colony-stimulating factor (GM-CSF) is a cytokine that stimulates the proliferation and differentiation of granulocyte and macrophage precursors. The mouse gene-encoding GM-CSF, Csf2, is regulated at both transcriptional and post-transcriptional levels. An adenine-uridine-rich element (ARE) within the 3'-untranslated region of Csf2 mRNA was shown in cell transfection studies to confer instability on this transcript. To explore the physiological importance of this element in an intact animal, we generated mice with a knock-in deletion of the 75-nucleotide ARE. Mice heterozygous for this ARE deletion developed severe respiratory distress and death within about 12 weeks of age. There was dense infiltration of lung alveolar spaces by crystal-containing macrophages. Increased stability of Csf2 mRNA was confirmed in bone marrow-derived macrophages, and elevated GM-CSF levels were observed in serum and lung. These mice did not exhibit notable abnormalities in blood or bone marrow, and transplantation of bone marrow from mutant mice into lethally irradiated WT mice did not confer the pulmonary phenotype. Mice with a conditional deletion of the ARE restricted to lung type II alveolar cells exhibited an essentially identical lethal lung phenotype at the same ages as the mice with the whole-body deletion. In contrast, mice with the same conditional ARE deletion in myeloid cells, including macrophages, exhibited lesser degrees of macrophage infiltration into alveolar spaces much later in life, at approximately 9 months of age. Post-transcriptional Csf2 mRNA stability regulation in pulmonary alveolar epithelial cells appears to be essential for normal physiological GM-CSF secretion and pulmonary macrophage homeostasis.
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Affiliation(s)
- Yukitomo Arao
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences/NIH, Durham, North Carolina, USA
| | - Deborah J Stumpo
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences/NIH, Durham, North Carolina, USA
| | - Mark J Hoenerhoff
- In Vivo Animal Core, Unit for Laboratory Animal Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - Robert M Tighe
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Yen-Rei Yu
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
- Division of Pulmonary Sciences and Critical Care Medicine, Department of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
| | - Deloris Sutton
- Cellular & Molecular Pathology Branch, National Institute of Environmental Health Sciences/NIH, Durham, North Carolina, USA
| | - Amogh Kashyap
- Epigenetics and Stem Cell Aging Unit, National Institute on Aging/NIH, Baltimore, Maryland, USA
| | - Isabel Beerman
- Epigenetics and Stem Cell Aging Unit, National Institute on Aging/NIH, Baltimore, Maryland, USA
| | - Perry J Blackshear
- Signal Transduction Laboratory, National Institute of Environmental Health Sciences/NIH, Durham, North Carolina, USA
- Departments of Medicine and Biochemistry, Duke University Medical Center, Durham, North Carolina, USA
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McKinlay LH, Tymms MJ, Thomas RS, Seth A, Hasthorpe S, Hertzog PJ, Kola I. The Role of Ets-1 in Mast Cell Granulocyte-Macrophage Colony-Stimulating Factor Expression and Activation. THE JOURNAL OF IMMUNOLOGY 1998. [DOI: 10.4049/jimmunol.161.8.4098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
Ets-1 is a transcription factor with restricted expression in lymphocytes, and it has been implicated in the regulation of T cell genes such as TCRα, TCRβ, CD4, IL-2, and TNF-α. We show in this study that Ets-1 is also expressed in some mast cells constitutively and can be induced in primary mast cells with stimuli that activate mast cells. We also show that Ets-1 plays a role in the regulation of granulocyte-macrophage CSF (GM-CSF), a cytokine expressed by activated mast cells. We have characterized a murine growth factor-independent mast cell line, FMP6−, derived from a factor-dependent cell line, FMP1.6. FMP6− has acquired a distinct connective tissue mast cell-like phenotype, as characterized by the expression of mast cell proteases MMCP-4 and MMCP-6, expression of IL-12, and the down-regulation of IL-4. The parental FMP1.6 cell line displays a mucosal mast cell-like phenotype. FMP6− cells have increased Ets-1 expression and achieve growth-factor independence by the autocrine production of GM-CSF and IL-3. Transient transfection of an Ets-1 expression construct in FMP6− cells results in transactivation of a GM-CSF reporter, while a point mutation in the consensus Ets binding site in the conserved lymphokine element, CLE0, abolishes Ets-1 transactivation. Importantly, antisense Ets-1 demonstrates an ability to repress the activity of the GM-CSF reporter. These data suggest a role for Ets-1 in mast cell growth regulation and activation, and because of the central role of mast cells in inflammatory processes, such as asthma and rheumatoid arthritis, they identify Ets-1 as potentially contributing to the pathophysiology of such diseases.
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Affiliation(s)
- Leigh H. McKinlay
- *Molecular Genetics and Development Group, Institute of Reproduction and Development, Monash University, Melbourne, Australia
| | - Martin J. Tymms
- *Molecular Genetics and Development Group, Institute of Reproduction and Development, Monash University, Melbourne, Australia
| | - Ross S. Thomas
- *Molecular Genetics and Development Group, Institute of Reproduction and Development, Monash University, Melbourne, Australia
| | - Arun Seth
- †Department of Pathology, Faculty of Medicine and Faculty of Dentistry, University of Toronto and Women’s College Hospital, Toronto, Ontario, Canada; and
| | - Suzanne Hasthorpe
- ‡F. Douglas Stephens Surgical Research Unit, Royal Children’s Hospital Research Foundation, Melbourne, Australia
| | - Paul J. Hertzog
- *Molecular Genetics and Development Group, Institute of Reproduction and Development, Monash University, Melbourne, Australia
| | - Ismail Kola
- *Molecular Genetics and Development Group, Institute of Reproduction and Development, Monash University, Melbourne, Australia
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