Human Primary Monocytes as a Model for in vitro Immunotoxicity Testing: Evaluation of the Regulatory Properties of TiO2 Nanoparticles.

IF 6.6 2区 医学 Q1 NANOSCIENCE & NANOTECHNOLOGY International Journal of Nanomedicine Pub Date : 2025-01-30 eCollection Date: 2025-01-01 DOI:10.2147/IJN.S498690
Tereza Svadlakova, Martina Kolackova, Pavel Kulich, Jan Kotoucek, Michaela Rosecka, Jan Krejsek, Zdeněk Fiala, Ctirad Andrýs
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引用次数: 0

Abstract

Introduction: A critical step preceding the potential biomedical application of nanoparticles is the evaluation of their immunomodulatory effects. Such nanoparticles are expected to enter the bloodstream where they can be recognized and processed by circulating monocytes. Despite the required biocompatibility, this interaction can affect intracellular homeostasis and modulate physiological functions, particularly inflammation. This study focuses on titanium dioxide (TiO2) as an example of relatively low cytotoxic nanoparticles with potential biomedical use and aims to evaluate their possible modulatory effects on the inflammasome-based response in human primary monocytes.

Methods: Monocyte viability, phenotypic changes, and cytokine production were determined after exposure to TiO2 (diameter, 25 nm; P25) alone. In the case of the modulatory effects, we focused on NLRP3 activation. The production of IL-1β and IL-10 was evaluated after (a) simultaneous activation of monocytes with bacterial stimuli muramyl dipeptide (MDP), or lipopolysaccharide (LPS), and TiO2 (co-exposure model), (b) prior activation with TiO2 alone and subsequent exposure to bacterial stimuli MDP or LPS. The differentiation of TiO2-treated monocytes into macrophages and their polarization were also assessed.

Results: The selected TiO2 concentration range (30-120 µg/mL) did not induce any significant cytotoxic effects. The highest dose of TiO2 promoted monocyte survival and differentiation into macrophages, with the M2 subset being the most prevalent. Nanoparticles alone did not induce substantial production of inflammatory cytokines IL-1β, IL-6, or TNF-α. The immunomodulatory effect on NLRP3 depended on the type of costimulant used. While co-exposure of monocytes to MDP and TiO2 boosted NLRP3 activity, co-exposure to LPS and TiO2 inhibited NLRP3 by enhancing IL-10 release. The inhibitory effect of TiO2 on NLRP3 based on the promotion of IL-10 was confirmed in a post-exposure model for both costimulants.

Conclusion: This study confirmed a non-negligible modulatory effect on primary monocytes in their inflammasome-based response and differentiation ability.

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来源期刊
International Journal of Nanomedicine
International Journal of Nanomedicine NANOSCIENCE & NANOTECHNOLOGY-PHARMACOLOGY & PHARMACY
CiteScore
14.40
自引率
3.80%
发文量
511
审稿时长
1.4 months
期刊介绍: The International Journal of Nanomedicine is a globally recognized journal that focuses on the applications of nanotechnology in the biomedical field. It is a peer-reviewed and open-access publication that covers diverse aspects of this rapidly evolving research area. With its strong emphasis on the clinical potential of nanoparticles in disease diagnostics, prevention, and treatment, the journal aims to showcase cutting-edge research and development in the field. Starting from now, the International Journal of Nanomedicine will not accept meta-analyses for publication.
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