Pulmonary Toxicity of Boron Nitride Nanomaterials Is Aspect Ratio Dependent
Visani de Luna, Luis Augusto (The University of Manchester)
Loret, Thomas (The University of Manchester)
He, Yilin (University of Strasbourg)
Legnani, Morgan (Université de Toulouse)
Lin, Hazel (University of Strasbourg)
Galibert, Anne Marie (Université de Toulouse)
Fordham, Alexander (The University of Manchester)
Holme, Sonja (The University of Manchester)
Del Rio Castillo, Antonio Esau (BeDimensional S.p.A)
Bonaccorso, Francesco (Istituto Italiano di Tecnologia)
Bianco, Alberto (University of Strasbourg)
Flahaut, Emmanuel (Université de Toulouse)
Kostarelos, Kostas (Institut Català de Nanociència i Nanotecnologia)
Bussy, Cyrill (The University of Manchester)

Data:	2023
Resum:	Boron nitride (BN) nanomaterials have drawn a lot of interest in the material science community. However, extensive research is still needed to thoroughly analyze their safety profiles. Herein, we investigated the pulmonary impact and clearance of two-dimensional hexagonal boron nitride (h -BN) nanosheets and boron nitride nanotubes (BNNTs) in mice. Animals were exposed by single oropharyngeal aspiration to h -BN or BNNTs. On days 1, 7, and 28, bronchoalveolar lavage (BAL) fluids and lungs were collected. On one hand, adverse effects on lungs were evaluated using various approaches (e. g. , immune response, histopathology, tissue remodeling, and genotoxicity). On the other hand, material deposition and clearance from the lungs were assessed. Two-dimensional h -BN did not cause any significant immune response or lung damage, although the presence of materials was confirmed by Raman spectroscopy. In addition, the low aspect ratio h -BN nanosheets were internalized rapidly by phagocytic cells present in alveoli, resulting in efficient clearance from the lungs. In contrast, high aspect ratio BNNTs caused a strong and long-lasting inflammatory response, characterized by sustained inflammation up to 28 days after exposure and the activation of both innate and adaptive immunity. Moreover, the presence of granulomatous structures and an indication of ongoing fibrosis as well as DNA damage in the lung parenchyma were evidenced with these materials. Concurrently, BNNTs were identified in lung sections for up to 28 days, suggesting long-term biopersistence, as previously demonstrated for other high aspect ratio nanomaterials with poor lung clearance such as multiwalled carbon nanotubes (MWCNTs). Overall, we reveal the safer toxicological profile of BN-based two-dimensional nanosheets in comparison to their nanotube counterparts. We also report strong similarities between BNNTs and MWCNTs in lung response, emphasizing their high aspect ratio as a major driver of their toxicity.
Ajuts:	Agencia Estatal de Investigación SEV-2017-0706 Agencia Estatal de Investigación CEX2021-001214-S European Commission 881603
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	2D materials ; Nanotubes ; Lungs ; Clearance ; Inflammation ; Fibrosis ; Genotoxicity
Publicat a:	ACS nano, Vol. 17, Num. 24 (December 2023) , p. 24919-24935, ISSN 1936-086X

DOI: 10.1021/acsnano.3c06599
PMID: 38051272

17 p, 14.6 MB

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