A 3D co-culture of three human cell lines to model the inflamed intestinal mucosa for safety testing of nanomaterials.
Oral exposure to nanomaterials is a current concern, asking for innovative biological test systems to assess their safety, especially also in conditions of inflammatory disorders. Aim of this study was to develop a 3D intestinal model, consisting of Caco-2 cells and two human immune cell lines, suitable to assess nanomaterial toxicity, in either healthy or diseased conditions. Human macrophages (THP-1) and human dendritic cells (MUTZ-3) were embedded in a collagen scaffold and seeded on the apical side of transwell inserts. Caco-2 cells were seeded on top of this layer, forming a 3D model of the intestinal mucosa. Toxicity of engineered nanoparticles (NM101 TiO2, NM300 Ag, Au) was evaluated in non-inflamed and inflamed co-cultures, and also compared to non-inflamed Caco-2 monocultures. Inflammation was elicited by IL-1β, and interactions with engineered NPs were addressed by different endpoints. The 3D co-culture showed well preserved ultrastructure and significant barrier properties. Ag NPs were found to be more toxic than TiO2 or Au NPs. But once inflamed with IL-1β, the co-cultures released higher amounts of IL-8 compared to Caco-2 monocultures. However, the cytotoxicity of Ag NPs was higher in Caco-2 monocultures than in 3D co-cultures. The naturally higher IL-8 production in the co-cultures was enhanced even further by the Ag NPs. This study shows that it is possible to mimic inflamed conditions in a 3D co-culture model of the intestinal mucosa. The fact that it is based on three easily available human cell lines makes this model valuable to study the safety of nanomaterials in the context of inflammation.
a Department of Drug Delivery , Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) , Saarbrücken , Germany .
Julia
J
Susewind
a Department of Drug Delivery , Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) , Saarbrücken , Germany .
Cristiane
C
de Souza Carvalho-Wodarz
c Department of Biosciences , University of Oslo , Blindernveien , Oslo , Norway.
Urska
U
Repnik
a Department of Drug Delivery , Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) , Saarbrücken , Germany .|b Department of Pharmacy , Biopharmacy and Pharmaceutical Technology, Saarland University , Saarbrücken , Germany , and.
Eva-Maria
EM
Collnot
a Department of Drug Delivery , Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) , Saarbrücken , Germany .
Nicole
N
Schneider-Daum
c Department of Biosciences , University of Oslo , Blindernveien , Oslo , Norway.
Gareth Wyn
GW
Griffiths
a Department of Drug Delivery , Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), Helmholtz Centre for Infection Research (HZI) , Saarbrücken , Germany .|b Department of Pharmacy , Biopharmacy and Pharmaceutical Technology, Saarland University , Saarbrücken , Germany , and.
Claus-Michael
CM
Lehr
D018938:Caco-2 Cells; D018920:Coculture Techniques; D006801:Humans; D007249:Inflammation / Q000139:chemically induced*; D016209:Interleukin-8 / Q000096:biosynthesis; D007413:Intestinal Mucosa / Q000187:drug effects*; D053768:Metal Nanoparticles / Q000633:toxicity; D049329:Nanostructures / Q000633:toxicity*; D014025:Titanium / Q000633:toxicity
D016209:Interleukin-8; C009495:titanium dioxide; D014025:Titanium
Caco-2; cytotoxicity; intestine; nanoparticles