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16-01-2024 | Pulmonary Emphysema | RESEARCH

Alpha-7 Nicotinic Receptor Agonist Protects Mice Against Pulmonary Emphysema Induced by Elastase

Authors: Rosana Banzato, Nathalia M. Pinheiro-Menegasso, Fernanda Paula Roncon Santana Novelli, Clarice R. Olivo, Laura Taguchi, Stheffany de Oliveira Santos, Silvia Fukuzaki, Walcy Paganelli Rosolia Teodoro, Fernanda D. T. Q. S. Lopes, Iolanda F. L. C. Tibério, Alessandra Choqueta de Toledo-Arruda, Marco Antônio M. Prado, Vânia F. Prado, Carla M. Prado

Published in: Inflammation | Issue 3/2024

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Abstract

Pulmonary emphysema is a primary component of chronic obstructive pulmonary disease (COPD), a life-threatening disorder characterized by lung inflammation and restricted airflow, primarily resulting from the destruction of small airways and alveolar walls. Cumulative evidence suggests that nicotinic receptors, especially the α7 subtype (α7nAChR), is required for anti-inflammatory cholinergic responses. We postulated that the stimulation of α7nAChR could offer therapeutic benefits in the context of pulmonary emphysema. To investigate this, we assessed the potential protective effects of PNU-282987, a selective α7nAChR agonist, using an experimental emphysema model. Male mice (C57BL/6) were submitted to a nasal instillation of porcine pancreatic elastase (PPE) (50 µl, 0.667 IU) to induce emphysema. Treatment with PNU-282987 (2.0 mg/kg, ip) was performed pre and post-emphysema induction by measuring anti-inflammatory effects (inflammatory cells, cytokines) as well as anti-remodeling and anti-oxidant effects. Elastase-induced emphysema led to an increase in the number of α7nAChR-positive cells in the lungs. Notably, both groups treated with PNU-282987 (prior to and following emphysema induction) exhibited a significant decrease in the number of α7nAChR-positive cells. Furthermore, both groups treated with PNU-282987 demonstrated decreased levels of macrophages, IL-6, IL-1β, collagen, and elastic fiber deposition. Additionally, both groups exhibited reduced STAT3 phosphorylation and lower levels of SOCS3. Of particular note, in the post-treated group, PNU-282987 successfully attenuated alveolar enlargement, decreased IL-17 and TNF-α levels, and reduced the recruitment of polymorphonuclear cells to the lung parenchyma. Significantly, it is worth noting that MLA, an antagonist of α7nAChR, counteracted the protective effects of PNU-282987 in relation to certain crucial inflammatory parameters. In summary, these findings unequivocally demonstrate the protective abilities of α7nAChR against elastase-induced emphysema, strongly supporting α7nAChR as a pivotal therapeutic target for ameliorating pulmonary emphysema.
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Metadata
Title
Alpha-7 Nicotinic Receptor Agonist Protects Mice Against Pulmonary Emphysema Induced by Elastase
Authors
Rosana Banzato
Nathalia M. Pinheiro-Menegasso
Fernanda Paula Roncon Santana Novelli
Clarice R. Olivo
Laura Taguchi
Stheffany de Oliveira Santos
Silvia Fukuzaki
Walcy Paganelli Rosolia Teodoro
Fernanda D. T. Q. S. Lopes
Iolanda F. L. C. Tibério
Alessandra Choqueta de Toledo-Arruda
Marco Antônio M. Prado
Vânia F. Prado
Carla M. Prado
Publication date
16-01-2024
Publisher
Springer US
Published in
Inflammation / Issue 3/2024
Print ISSN: 0360-3997
Electronic ISSN: 1573-2576
DOI
https://doi.org/10.1007/s10753-023-01953-9

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