Size-dependent cytotoxicity of silver nanoparticles in human neutrophils assessed by multiple analytical approaches

• Type: Article in International Scientific Journal
• Date: 2016

Authors

Soares, T (Author) Other; Ribeiro, D (Author) Other; Proenca, C (Author) Other; Chiste, RC (Author) Other; Eduarda Fernandes (Author) FFUP; Freitas, M (Author) Other

Journal

Title: Life Sciences

Vol. 145

Pages: 247-254

ISSN: 0024-3205

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 19 Citations

Scopus - 40 Citations

Other information

Authenticus ID: P-00K-27S

DOI: 10.1016/j.lfs.2015.12.046

Abstract (EN): Aims: Silver nanoparticles (AgNPs) have emerged as an important class of nanomaterials with a wide range of industrial and medical applications. The assessment of AgNPs' biological effects in the human organism is therefore essential to evaluate the impact of these nanomaterials in public health and reassure the ratio benefit/risk. In the present study, the effect of polyvinyl pyrrolidone (PVP)-coated AgNPs with distinct sizes (10 and 50 nm) on neutrophils' oxidative burst and toxicity were tested. Main methods: The effect of AgNPs on human neutrophils viability was evaluated by trypan blue, neutral red and propidium iodide methods. The measurement of neutrophils' oxidative burst was performed using the probe dihydrorhodamine 123. The cytomorphological alterations of human neutrophils exposed to AgNPs were evaluated by optical microscopy and transmission electron microscopy. Key findings: It was observed that PVP-coated AgNPs are toxic to human neutrophils being the 10nm AgNPs more toxic than the 50 nm AgNPs. The smallest AgNPs lead to membrane damage, impaired lysosomal activity and induce neutrophils' oxidative burst. Despite the production of reactive species, the toxicity of AgNPs is not NADPH oxidase-dependent. Significance: These data indicate that AgNPs are toxic to human neutrophils in concentration-, time-and size-dependent manner, but independent of NADPH oxidase activation.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8