Pulmonary Toxicity in Rats Caused by Exposure to Intratracheal Instillation of SiO2 Nanoparticles / 生物医学与环境科学(英文)
Biomedical and Environmental Sciences
;
(12): 264-279, 2017.
Artículo
en Inglés
| WPRIM
| ID: wpr-296488
ABSTRACT
<p><b>OBJECTIVE</b>The effect of the silica nanoparticles (SNs) on lungs injury in rats was investigated to evaluate the toxicity and possible mechanisms for SNs.</p><p><b>METHODS</b>Male Wistar rats were instilled intratracheally with 1 mL of saline containing 6.25, 12.5, and 25.0 mg of SNs or 25.0 mg of microscale SiO2 particles suspensions for 30 d, were then sacrificed. Histopathological and ultrastructural change in lungs, and chemical components in the urine excretions were investigated by light microscope, TEM and EDS. MDA, NO and hydroxyproline (Hyp) in lung homogenates were quantified by spectrophotometry. Contents of TNF-α, TGF-β1, IL-1β, and MMP-2 in lung tissue were determined by immunohistochemistry staining.</p><p><b>RESULTS</b>There is massive excretion of Si substance in urine. The SNs lead pulmonary lesions of rise in lung/body coefficients, lung inflammation, damaged alveoli, granuloma nodules formation, and collagen metabolized perturbation, and lung tissue damage is milder than those of microscale SiO2 particles. The SNs also cause increase lipid peroxidation and high expression of cytokines.</p><p><b>CONCLUSION</b>The SNs result into pulmonary fibrosis by means of increase lipid peroxidation and high expression of cytokines. Milder effect of the SNs on pulmonary fibrosis comparing to microscale SiO2 particles is contributed to its elimination from urine due to their ultrafine particle size.</p>
Texto completo:
Disponible
Índice:
WPRIM (Pacífico Occidental)
Asunto principal:
Patología
/
Fibrosis Pulmonar
/
Espectrometría por Rayos X
/
Orina
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Distribución Aleatoria
/
Química
/
Ratas Wistar
/
Organismos Libres de Patógenos Específicos
/
Dióxido de Silicio
/
Microscopía Electrónica de Transmisión
Límite:
Animales
Idioma:
Inglés
Revista:
Biomedical and Environmental Sciences
Año:
2017
Tipo del documento:
Artículo
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