Print Email Facebook Twitter Coadministration of antigen and particles optimally stimulates the immune response in an intranasal administration model in mice Title Coadministration of antigen and particles optimally stimulates the immune response in an intranasal administration model in mice Author van Zijverden, M. de Haar, C. van Beelen, A. van Loveren, H. Penninks, A. Pieters, R. Centraal Instituut voor Voedingsonderzoek TNO Publication year 2001 Abstract Some particulate matter is known to affect human health, yet the mechanism(s) by which it acts is largely unknown. One of the factors that may play a role in the immune- stimulating activity of particles is binding of allergen to particles. This may turn the particles into allergen carriers, resulting in antigen deposition within the altered inflammatory microenvironment created by the particles. We compared the effectivity of simultaneous versus separate administration of antigen and particles during sensitization in an intranasal exposure model in BALB/c mice. Sensitization consisted of three separate doses (10 μg) of TNP-OVA at Days 1, 2, and 3. Two hundred micrograms of carbon black particles (CBP) were administered either 1 day before sensitization (Day 0), 1 day after sensitization (Day 4), or during sensitization. The latter was performed either at Day 1 (200 μg) or at Days 1, 2, and 3 (67 μg/day). At Day 10 a challenge with 10 μg of TNP-OVA was performed, and at Day 15 the immune response was assessed. The total number of cells as well as antibody-forming cells (AFC) in lymph nodes draining the lung (peribronchial lymph nodes [PBLN]) were determined, and immunoglobulin levels in blood were assessed. Cell numbers of PBLN increased significantly in all particle-treated groups compared to controls. The number of TNP-specific IgG1-forming cells in the groups receiving particles during sensitization was significantly higher than control level. Only groups receiving particles during or before sensitization displayed significantly higher IgG1 levels than controls, in contrast to the group receiving particles after sensitization. Only in animals receiving three doses of 67 μg during sensitization did TNP-specific IgE increase significantly compared to controls. IgG2a did not show significant differences compared to controls, indicating that the response is predominantly Th2 mediated. These data indicate that coadministration of particles at all time points of antigen dosing is the most effective way to stimulate an immune response in our model compared to separate particle and antigen dosing. Also, administration shortly before antigen administration was effective in stimulating an immune response, suggesting that time-dependent processes are involved in immune-stimulating activity of particles, supporting the important role of the altered inflammatory microenvironment created by the particles. © 2001 Elsevier Science. Chemicals/CAS: Carbon, 7440-44-0; Immunoglobulin E, 37341-29-0; Immunoglobulin G; Ovalbumin, 9006-59-1; trinitrophenyl-ovalbumin Subject NutritionAdministration, IntranasalAnimalsAntibody-Producing CellsCarbonCell CountDisease Models, AnimalDrug Administration ScheduleEnzyme-Linked Immunosorbent AssayFemaleHypersensitivityImmunoglobulin EImmunoglobulin GLungLymph NodesMiceMice, Inbred BALB COvalbuminParticle SizeTime FactorsAnimalia To reference this document use: http://resolver.tudelft.nl/uuid:1497dca3-8811-4556-bdba-38940747673d DOI https://doi.org/10.1006/taap.2001.9306 TNO identifier 87738 ISSN 0041-008X Source Toxicology and Applied Pharmacology, 177 (3), 174-178 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.