Silicon dioxide nanoparticle exposure affects small intestine function in an in vitro model.

Area of Science:

• Nanotechnology
• Toxicology
• Gastroenterology

Background:

• Nanomaterials enhance food properties and drug delivery.
• Health effects of ingested nanomaterials, like silicon dioxide nanoparticles (SiO2 NP), are largely unknown.
• Understanding SiO2 NP impact on gastrointestinal health is crucial.

Purpose of the Study:

• Characterize SiO2 NP properties.
• Investigate SiO2 NP effects on gastrointestinal health and function using an in vitro model.
• Assess impacts at physiologically relevant doses.

Main Methods:

• Utilized an in vitro model of Caco-2 and HT29-MTX co-cultures.
• Exposed the model to characterized SiO2 NP for acute (4h) and chronic (5d) periods.
• Analyzed nutrient absorption, intestinal alkaline phosphatase activity, barrier function, gene expression, oxidative stress, and brush border morphology.

Main Results:

• SiO2 NP significantly altered iron, zinc, glucose, and lipid absorption.
• Increased intestinal alkaline phosphatase activity and decreased epithelial barrier function.
• Induced oxidative stress, altered nutrient transporter gene expression, and damaged microvilli, reducing surface area.

Conclusions:

• Physiologically relevant doses of SiO2 NP cause adverse effects on the gastrointestinal system in vitro.
• SiO2 NP can negatively impact nutrient absorption and intestinal barrier integrity.
• Further research is needed to understand the long-term health implications of ingested SiO2 NP.